setup-config.sh

#!/bin/bash
# SPDX-License-Identifier: GPL-3.0-only
# Copyright (c) 2026 Marcus Krueger
# Copy configuration files to workspace based on file-manifest.json

CONFIG_DIR="${CONFIG_SOURCE_DIR:?CONFIG_SOURCE_DIR not set}"
MANIFEST="$CONFIG_DIR/file-manifest.json"

log() { echo "[setup-config] $*"; }
warn() { echo "[setup-config] WARNING: $*"; }
err() { echo "[setup-config] ERROR: $*" >&2; }

# Deprecation notice if legacy OVERWRITE_CONFIG is still set
if [ -n "${OVERWRITE_CONFIG+x}" ]; then
	warn "OVERWRITE_CONFIG is deprecated. Use per-file 'overwrite' in config/file-manifest.json instead."
fi

# ── Legacy fallback ──────────────────────────────────────────────
legacy_copy() {
	local target_dir="${CLAUDE_CONFIG_DIR:?CLAUDE_CONFIG_DIR not set}"
	warn "file-manifest.json not found, falling back to legacy copy"
	mkdir -p "$target_dir"
	for file in defaults/settings.json defaults/keybindings.json defaults/main-system-prompt.md; do
		if [ -f "$CONFIG_DIR/$file" ]; then
			local basename="${file##*/}"
			cp "$CONFIG_DIR/$file" "$target_dir/$basename"
			chown "$(id -un):$(id -gn)" "$target_dir/$basename" 2>/dev/null || true
			log "Copied $basename (legacy)"
		fi
	done
	log "Configuration complete (legacy)"
}

if [ ! -f "$MANIFEST" ]; then
	legacy_copy
	exit 0
fi

# ── Validate manifest JSON ──────────────────────────────────────
if ! jq empty "$MANIFEST" 2>/dev/null; then
	err "Invalid JSON in file-manifest.json"
	exit 1
fi

# ── Variable expansion ───────────────────────────────────────────
expand_vars() {
	local val="$1"
	val="${val//\$\{CLAUDE_CONFIG_DIR\}/$CLAUDE_CONFIG_DIR}"
	val="${val//\$\{WORKSPACE_ROOT\}/$WORKSPACE_ROOT}"
	val="${val//\$\{HOME\}/$HOME}"
	# Warn on any remaining unresolved ${...} tokens
	if [[ "$val" =~ \$\{[^}]+\} ]]; then
		warn "Unresolved variable in: $val"
	fi
	echo "$val"
}

# ── Change detection ─────────────────────────────────────────────
should_copy() {
	local src="$1" dest="$2"
	[ ! -f "$dest" ] && return 0
	local src_hash dest_hash
	src_hash=$(sha256sum "$src" | cut -d' ' -f1)
	dest_hash=$(sha256sum "$dest" | cut -d' ' -f1)
	[ "$src_hash" != "$dest_hash" ]
}

# ── Process manifest ─────────────────────────────────────────────
log "Copying configuration files..."

# Single jq invocation to extract all fields (reduces N×5 subprocess calls to 1)
# Note: empty destFilename uses "__NONE__" sentinel because bash read collapses
# consecutive tab delimiters, which shifts fields when destFilename is empty.
jq -r '.[] | [.src, .dest, (.destFilename // "__NONE__"), (.enabled // true | tostring), (.overwrite // "if-changed")] | @tsv' "$MANIFEST" |
	while IFS=$'\t' read -r src dest dest_filename enabled overwrite; do
		# Skip disabled entries
		if [ "$enabled" = "false" ]; then
			log "Skipping $src (disabled)"
			continue
		fi

		# Resolve paths
		src_path="$CONFIG_DIR/$src"
		dest_dir=$(expand_vars "$dest")
		[ "$dest_filename" = "__NONE__" ] && dest_filename=""
		filename="${dest_filename:-${src##*/}}"
		dest_path="$dest_dir/$filename"

		# Validate source exists
		if [ ! -f "$src_path" ]; then
			warn "$src not found in config dir, skipping"
			continue
		fi

		# Ensure destination directory exists
		mkdir -p "$dest_dir"

		# Apply overwrite strategy
		case "$overwrite" in
		always)
			cp "$src_path" "$dest_path"
			log "Copied $src → $dest_path (always)"
			;;
		never)
			if [ ! -f "$dest_path" ]; then
				cp "$src_path" "$dest_path"
				log "Copied $src → $dest_path (new)"
			else
				log "Skipping $src (exists, overwrite=never)"
			fi
			;;
		if-changed | *)
			if should_copy "$src_path" "$dest_path"; then
				cp "$src_path" "$dest_path"
				log "Copied $src → $dest_path (changed)"
			else
				log "Skipping $src (unchanged)"
			fi
			;;
		esac

		# Fix ownership
		chown "$(id -un):$(id -gn)" "$dest_path" 2>/dev/null || true
	done

log "Configuration complete"