pullrequests.go

package github

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	"github.com/github/github-mcp-server/pkg/translations"
	"github.com/google/go-github/v69/github"
	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"
)

// GetPullRequest creates a tool to get details of a specific pull request.
func GetPullRequest(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("get_pull_request",
			mcp.WithDescription(t("TOOL_GET_PULL_REQUEST_DESCRIPTION", "Get details of a specific pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			pr, resp, err := client.PullRequests.Get(ctx, owner, repo, pullNumber)
			if err != nil {
				return nil, fmt.Errorf("failed to get pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get pull request: %s", string(body))), nil
			}

			r, err := json.Marshal(pr)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// UpdatePullRequest creates a tool to update an existing pull request.
func UpdatePullRequest(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("update_pull_request",
			mcp.WithDescription(t("TOOL_UPDATE_PULL_REQUEST_DESCRIPTION", "Update an existing pull request in a GitHub repository")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number to update"),
			),
			mcp.WithString("title",
				mcp.Description("New title"),
			),
			mcp.WithString("body",
				mcp.Description("New description"),
			),
			mcp.WithString("state",
				mcp.Description("New state ('open' or 'closed')"),
				mcp.Enum("open", "closed"),
			),
			mcp.WithString("base",
				mcp.Description("New base branch name"),
			),
			mcp.WithBoolean("maintainer_can_modify",
				mcp.Description("Allow maintainer edits"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			// Build the update struct only with provided fields
			update := &github.PullRequest{}
			updateNeeded := false

			if title, ok, err := OptionalParamOK[string](request, "title"); err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			} else if ok {
				update.Title = github.Ptr(title)
				updateNeeded = true
			}

			if body, ok, err := OptionalParamOK[string](request, "body"); err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			} else if ok {
				update.Body = github.Ptr(body)
				updateNeeded = true
			}

			if state, ok, err := OptionalParamOK[string](request, "state"); err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			} else if ok {
				update.State = github.Ptr(state)
				updateNeeded = true
			}

			if base, ok, err := OptionalParamOK[string](request, "base"); err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			} else if ok {
				update.Base = &github.PullRequestBranch{Ref: github.Ptr(base)}
				updateNeeded = true
			}

			if maintainerCanModify, ok, err := OptionalParamOK[bool](request, "maintainer_can_modify"); err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			} else if ok {
				update.MaintainerCanModify = github.Ptr(maintainerCanModify)
				updateNeeded = true
			}

			if !updateNeeded {
				return mcp.NewToolResultError("No update parameters provided."), nil
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			pr, resp, err := client.PullRequests.Edit(ctx, owner, repo, pullNumber, update)
			if err != nil {
				return nil, fmt.Errorf("failed to update pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to update pull request: %s", string(body))), nil
			}

			r, err := json.Marshal(pr)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// ListPullRequests creates a tool to list and filter repository pull requests.
func ListPullRequests(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("list_pull_requests",
			mcp.WithDescription(t("TOOL_LIST_PULL_REQUESTS_DESCRIPTION", "List and filter repository pull requests")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithString("state",
				mcp.Description("Filter by state ('open', 'closed', 'all')"),
			),
			mcp.WithString("head",
				mcp.Description("Filter by head user/org and branch"),
			),
			mcp.WithString("base",
				mcp.Description("Filter by base branch"),
			),
			mcp.WithString("sort",
				mcp.Description("Sort by ('created', 'updated', 'popularity', 'long-running')"),
			),
			mcp.WithString("direction",
				mcp.Description("Sort direction ('asc', 'desc')"),
			),
			WithPagination(),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			state, err := OptionalParam[string](request, "state")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			head, err := OptionalParam[string](request, "head")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			base, err := OptionalParam[string](request, "base")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			sort, err := OptionalParam[string](request, "sort")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			direction, err := OptionalParam[string](request, "direction")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pagination, err := OptionalPaginationParams(request)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			opts := &github.PullRequestListOptions{
				State:     state,
				Head:      head,
				Base:      base,
				Sort:      sort,
				Direction: direction,
				ListOptions: github.ListOptions{
					PerPage: pagination.perPage,
					Page:    pagination.page,
				},
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			prs, resp, err := client.PullRequests.List(ctx, owner, repo, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to list pull requests: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to list pull requests: %s", string(body))), nil
			}

			r, err := json.Marshal(prs)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// MergePullRequest creates a tool to merge a pull request.
func MergePullRequest(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("merge_pull_request",
			mcp.WithDescription(t("TOOL_MERGE_PULL_REQUEST_DESCRIPTION", "Merge a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
			mcp.WithString("commit_title",
				mcp.Description("Title for merge commit"),
			),
			mcp.WithString("commit_message",
				mcp.Description("Extra detail for merge commit"),
			),
			mcp.WithString("merge_method",
				mcp.Description("Merge method ('merge', 'squash', 'rebase')"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			commitTitle, err := OptionalParam[string](request, "commit_title")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			commitMessage, err := OptionalParam[string](request, "commit_message")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			mergeMethod, err := OptionalParam[string](request, "merge_method")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			options := &github.PullRequestOptions{
				CommitTitle: commitTitle,
				MergeMethod: mergeMethod,
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			result, resp, err := client.PullRequests.Merge(ctx, owner, repo, pullNumber, commitMessage, options)
			if err != nil {
				return nil, fmt.Errorf("failed to merge pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to merge pull request: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// GetPullRequestFiles creates a tool to get the list of files changed in a pull request.
func GetPullRequestFiles(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("get_pull_request_files",
			mcp.WithDescription(t("TOOL_GET_PULL_REQUEST_FILES_DESCRIPTION", "Get the list of files changed in a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			opts := &github.ListOptions{}
			files, resp, err := client.PullRequests.ListFiles(ctx, owner, repo, pullNumber, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to get pull request files: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get pull request files: %s", string(body))), nil
			}

			r, err := json.Marshal(files)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// GetPullRequestStatus creates a tool to get the combined status of all status checks for a pull request.
func GetPullRequestStatus(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("get_pull_request_status",
			mcp.WithDescription(t("TOOL_GET_PULL_REQUEST_STATUS_DESCRIPTION", "Get the combined status of all status checks for a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			// First get the PR to find the head SHA
			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			pr, resp, err := client.PullRequests.Get(ctx, owner, repo, pullNumber)
			if err != nil {
				return nil, fmt.Errorf("failed to get pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get pull request: %s", string(body))), nil
			}

			// Get combined status for the head SHA
			status, resp, err := client.Repositories.GetCombinedStatus(ctx, owner, repo, *pr.Head.SHA, nil)
			if err != nil {
				return nil, fmt.Errorf("failed to get combined status: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get combined status: %s", string(body))), nil
			}

			r, err := json.Marshal(status)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// UpdatePullRequestBranch creates a tool to update a pull request branch with the latest changes from the base branch.
func UpdatePullRequestBranch(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("update_pull_request_branch",
			mcp.WithDescription(t("TOOL_UPDATE_PULL_REQUEST_BRANCH_DESCRIPTION", "Update a pull request branch with the latest changes from the base branch")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
			mcp.WithString("expectedHeadSha",
				mcp.Description("The expected SHA of the pull request's HEAD ref"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			expectedHeadSHA, err := OptionalParam[string](request, "expectedHeadSha")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			opts := &github.PullRequestBranchUpdateOptions{}
			if expectedHeadSHA != "" {
				opts.ExpectedHeadSHA = github.Ptr(expectedHeadSHA)
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			result, resp, err := client.PullRequests.UpdateBranch(ctx, owner, repo, pullNumber, opts)
			if err != nil {
				// Check if it's an acceptedError. An acceptedError indicates that the update is in progress,
				// and it's not a real error.
				if resp != nil && resp.StatusCode == http.StatusAccepted && isAcceptedError(err) {
					return mcp.NewToolResultText("Pull request branch update is in progress"), nil
				}
				return nil, fmt.Errorf("failed to update pull request branch: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusAccepted {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to update pull request branch: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// GetPullRequestComments creates a tool to get the review comments on a pull request.
func GetPullRequestComments(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("get_pull_request_comments",
			mcp.WithDescription(t("TOOL_GET_PULL_REQUEST_COMMENTS_DESCRIPTION", "Get the review comments on a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			opts := &github.PullRequestListCommentsOptions{
				ListOptions: github.ListOptions{
					PerPage: 100,
				},
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			comments, resp, err := client.PullRequests.ListComments(ctx, owner, repo, pullNumber, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to get pull request comments: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get pull request comments: %s", string(body))), nil
			}

			r, err := json.Marshal(comments)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// AddPullRequestReviewComment creates a tool to add a review comment to a pull request.
func AddPullRequestReviewComment(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("add_pull_request_review_comment",
			mcp.WithDescription(t("TOOL_ADD_PULL_REQUEST_COMMENT_DESCRIPTION", "Add a review comment to a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pull_number",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
			mcp.WithString("body",
				mcp.Required(),
				mcp.Description("The text of the review comment"),
			),
			mcp.WithString("commit_id",
				mcp.Description("The SHA of the commit to comment on. Required unless in_reply_to is specified."),
			),
			mcp.WithString("path",
				mcp.Description("The relative path to the file that necessitates a comment. Required unless in_reply_to is specified."),
			),
			mcp.WithString("subject_type",
				mcp.Description("The level at which the comment is targeted, 'line' or 'file'"),
				mcp.Enum("line", "file"),
			),
			mcp.WithNumber("line",
				mcp.Description("The line of the blob in the pull request diff that the comment applies to. For multi-line comments, the last line of the range"),
			),
			mcp.WithString("side",
				mcp.Description("The side of the diff to comment on. Can be LEFT or RIGHT"),
				mcp.Enum("LEFT", "RIGHT"),
			),
			mcp.WithNumber("start_line",
				mcp.Description("For multi-line comments, the first line of the range that the comment applies to"),
			),
			mcp.WithString("start_side",
				mcp.Description("For multi-line comments, the starting side of the diff that the comment applies to. Can be LEFT or RIGHT"),
				mcp.Enum("LEFT", "RIGHT"),
			),
			mcp.WithNumber("in_reply_to",
				mcp.Description("The ID of the review comment to reply to. When specified, only body is required and all other parameters are ignored"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pull_number")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			body, err := requiredParam[string](request, "body")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}

			// Check if this is a reply to an existing comment
			if replyToFloat, ok := request.Params.Arguments["in_reply_to"].(float64); ok {
				// Use the specialized method for reply comments due to inconsistency in underlying go-github library: https://github.com/google/go-github/pull/950
				commentID := int64(replyToFloat)
				createdReply, resp, err := client.PullRequests.CreateCommentInReplyTo(ctx, owner, repo, pullNumber, body, commentID)
				if err != nil {
					return nil, fmt.Errorf("failed to reply to pull request comment: %w", err)
				}
				defer func() { _ = resp.Body.Close() }()

				if resp.StatusCode != http.StatusCreated {
					respBody, err := io.ReadAll(resp.Body)
					if err != nil {
						return nil, fmt.Errorf("failed to read response body: %w", err)
					}
					return mcp.NewToolResultError(fmt.Sprintf("failed to reply to pull request comment: %s", string(respBody))), nil
				}

				r, err := json.Marshal(createdReply)
				if err != nil {
					return nil, fmt.Errorf("failed to marshal response: %w", err)
				}

				return mcp.NewToolResultText(string(r)), nil
			}

			// This is a new comment, not a reply
			// Verify required parameters for a new comment
			commitID, err := requiredParam[string](request, "commit_id")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			path, err := requiredParam[string](request, "path")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			comment := &github.PullRequestComment{
				Body:     github.Ptr(body),
				CommitID: github.Ptr(commitID),
				Path:     github.Ptr(path),
			}

			subjectType, err := OptionalParam[string](request, "subject_type")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			if subjectType != "file" {
				line, lineExists := request.Params.Arguments["line"].(float64)
				startLine, startLineExists := request.Params.Arguments["start_line"].(float64)
				side, sideExists := request.Params.Arguments["side"].(string)
				startSide, startSideExists := request.Params.Arguments["start_side"].(string)

				if !lineExists {
					return mcp.NewToolResultError("line parameter is required unless using subject_type:file"), nil
				}

				comment.Line = github.Ptr(int(line))
				if sideExists {
					comment.Side = github.Ptr(side)
				}
				if startLineExists {
					comment.StartLine = github.Ptr(int(startLine))
				}
				if startSideExists {
					comment.StartSide = github.Ptr(startSide)
				}

				if startLineExists && !lineExists {
					return mcp.NewToolResultError("if start_line is provided, line must also be provided"), nil
				}
				if startSideExists && !sideExists {
					return mcp.NewToolResultError("if start_side is provided, side must also be provided"), nil
				}
			}

			createdComment, resp, err := client.PullRequests.CreateComment(ctx, owner, repo, pullNumber, comment)
			if err != nil {
				return nil, fmt.Errorf("failed to create pull request comment: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusCreated {
				respBody, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to create pull request comment: %s", string(respBody))), nil
			}

			r, err := json.Marshal(createdComment)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// GetPullRequestReviews creates a tool to get the reviews on a pull request.
func GetPullRequestReviews(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("get_pull_request_reviews",
			mcp.WithDescription(t("TOOL_GET_PULL_REQUEST_REVIEWS_DESCRIPTION", "Get the reviews on a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			reviews, resp, err := client.PullRequests.ListReviews(ctx, owner, repo, pullNumber, nil)
			if err != nil {
				return nil, fmt.Errorf("failed to get pull request reviews: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to get pull request reviews: %s", string(body))), nil
			}

			r, err := json.Marshal(reviews)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// CreatePullRequestReview creates a tool to submit a review on a pull request.
func CreatePullRequestReview(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("create_pull_request_review",
			mcp.WithDescription(t("TOOL_CREATE_PULL_REQUEST_REVIEW_DESCRIPTION", "Create a review on a pull request")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
			mcp.WithString("body",
				mcp.Description("Review comment text"),
			),
			mcp.WithString("event",
				mcp.Required(),
				mcp.Description("Review action ('APPROVE', 'REQUEST_CHANGES', 'COMMENT')"),
			),
			mcp.WithString("commitId",
				mcp.Description("SHA of commit to review"),
			),
			mcp.WithArray("comments",
				mcp.Items(
					map[string]interface{}{
						"type":                 "object",
						"additionalProperties": false,
						"required":             []string{"path", "body"},
						"properties": map[string]interface{}{
							"path": map[string]interface{}{
								"type":        "string",
								"description": "path to the file",
							},
							"position": map[string]interface{}{
								"type":        "number",
								"description": "position of the comment in the diff",
							},
							"line": map[string]interface{}{
								"type":        "number",
								"description": "line number in the file to comment on. For multi-line comments, the end of the line range",
							},
							"side": map[string]interface{}{
								"type":        "string",
								"description": "The side of the diff on which the line resides. For multi-line comments, this is the side for the end of the line range. (LEFT or RIGHT)",
							},
							"start_line": map[string]interface{}{
								"type":        "number",
								"description": "The first line of the range to which the comment refers. Required for multi-line comments.",
							},
							"start_side": map[string]interface{}{
								"type":        "string",
								"description": "The side of the diff on which the start line resides for multi-line comments. (LEFT or RIGHT)",
							},
							"body": map[string]interface{}{
								"type":        "string",
								"description": "comment body",
							},
						},
					},
				),
				mcp.Description("Line-specific comments array of objects to place comments on pull request changes. Requires path and body. For line comments use line or position. For multi-line comments use start_line and line with optional side parameters."),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			event, err := requiredParam[string](request, "event")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			// Create review request
			reviewRequest := &github.PullRequestReviewRequest{
				Event: github.Ptr(event),
			}

			// Add body if provided
			body, err := OptionalParam[string](request, "body")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			if body != "" {
				reviewRequest.Body = github.Ptr(body)
			}

			// Add commit ID if provided
			commitID, err := OptionalParam[string](request, "commitId")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			if commitID != "" {
				reviewRequest.CommitID = github.Ptr(commitID)
			}

			// Add comments if provided
			if commentsObj, ok := request.Params.Arguments["comments"].([]interface{}); ok && len(commentsObj) > 0 {
				comments := []*github.DraftReviewComment{}

				for _, c := range commentsObj {
					commentMap, ok := c.(map[string]interface{})
					if !ok {
						return mcp.NewToolResultError("each comment must be an object with path and body"), nil
					}

					path, ok := commentMap["path"].(string)
					if !ok || path == "" {
						return mcp.NewToolResultError("each comment must have a path"), nil
					}

					body, ok := commentMap["body"].(string)
					if !ok || body == "" {
						return mcp.NewToolResultError("each comment must have a body"), nil
					}

					_, hasPosition := commentMap["position"].(float64)
					_, hasLine := commentMap["line"].(float64)
					_, hasSide := commentMap["side"].(string)
					_, hasStartLine := commentMap["start_line"].(float64)
					_, hasStartSide := commentMap["start_side"].(string)

					switch {
					case !hasPosition && !hasLine:
						return mcp.NewToolResultError("each comment must have either position or line"), nil
					case hasPosition && (hasLine || hasSide || hasStartLine || hasStartSide):
						return mcp.NewToolResultError("position cannot be combined with line, side, start_line, or start_side"), nil
					case hasStartSide && !hasSide:
						return mcp.NewToolResultError("if start_side is provided, side must also be provided"), nil
					}

					comment := &github.DraftReviewComment{
						Path: github.Ptr(path),
						Body: github.Ptr(body),
					}

					if positionFloat, ok := commentMap["position"].(float64); ok {
						comment.Position = github.Ptr(int(positionFloat))
					} else if lineFloat, ok := commentMap["line"].(float64); ok {
						comment.Line = github.Ptr(int(lineFloat))
					}
					if side, ok := commentMap["side"].(string); ok {
						comment.Side = github.Ptr(side)
					}
					if startLineFloat, ok := commentMap["start_line"].(float64); ok {
						comment.StartLine = github.Ptr(int(startLineFloat))
					}
					if startSide, ok := commentMap["start_side"].(string); ok {
						comment.StartSide = github.Ptr(startSide)
					}

					comments = append(comments, comment)
				}

				reviewRequest.Comments = comments
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			review, resp, err := client.PullRequests.CreateReview(ctx, owner, repo, pullNumber, reviewRequest)
			if err != nil {
				return nil, fmt.Errorf("failed to create pull request review: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to create pull request review: %s", string(body))), nil
			}

			r, err := json.Marshal(review)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// CreatePullRequest creates a tool to create a new pull request.
func CreatePullRequest(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("create_pull_request",
			mcp.WithDescription(t("TOOL_CREATE_PULL_REQUEST_DESCRIPTION", "Create a new pull request in a GitHub repository")),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithString("title",
				mcp.Required(),
				mcp.Description("PR title"),
			),
			mcp.WithString("body",
				mcp.Description("PR description"),
			),
			mcp.WithString("head",
				mcp.Required(),
				mcp.Description("Branch containing changes"),
			),
			mcp.WithString("base",
				mcp.Required(),
				mcp.Description("Branch to merge into"),
			),
			mcp.WithBoolean("draft",
				mcp.Description("Create as draft PR"),
			),
			mcp.WithBoolean("maintainer_can_modify",
				mcp.Description("Allow maintainer edits"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			title, err := requiredParam[string](request, "title")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			head, err := requiredParam[string](request, "head")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			base, err := requiredParam[string](request, "base")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			body, err := OptionalParam[string](request, "body")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			draft, err := OptionalParam[bool](request, "draft")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			maintainerCanModify, err := OptionalParam[bool](request, "maintainer_can_modify")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			newPR := &github.NewPullRequest{
				Title: github.Ptr(title),
				Head:  github.Ptr(head),
				Base:  github.Ptr(base),
			}

			if body != "" {
				newPR.Body = github.Ptr(body)
			}

			newPR.Draft = github.Ptr(draft)
			newPR.MaintainerCanModify = github.Ptr(maintainerCanModify)

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			pr, resp, err := client.PullRequests.Create(ctx, owner, repo, newPR)
			if err != nil {
				return nil, fmt.Errorf("failed to create pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusCreated {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to create pull request: %s", string(body))), nil
			}

			r, err := json.Marshal(pr)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}