SubscriptionSettingsUseCase.kt

package at.bitfire.icsdroid.model

import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
import androidx.core.net.toUri
import at.bitfire.icsdroid.HttpUtils
import at.bitfire.icsdroid.db.entity.Credential
import at.bitfire.icsdroid.db.entity.Subscription
import javax.inject.Inject
import javax.inject.Singleton

@Singleton
class SubscriptionSettingsUseCase @Inject constructor() {
    data class UiState(
        val url: String? = null,
        val fileName: String? = null,
        val urlError: String? = null,
        val title: String? = null,
        val color: Int? = null,
        val customUserAgent: String? = null,
        val ignoreAlerts: Boolean = false,
        val defaultAlarmMinutes: Long? = null,
        val defaultAllDayAlarmMinutes: Long? = null,
        // advanced settings
        val ignoreDescription: Boolean = false,

        // credentials
        val requiresAuth: Boolean = false,
        val username: String? = null,
        val password: String? = null,
        val isInsecure: Boolean = false
    ) {
        // computed settings
        val validUrlInput: Boolean = url?.let { url ->
            HttpUtils.acceptedProtocol(url.toUri())
        } ?: false
    }

    var uiState by mutableStateOf(UiState())
        private set

    fun setUrl(value: String?) {
        uiState = uiState.copy(url = value)
    }

    fun setFileName(value: String?) {
        uiState = uiState.copy(fileName = value)
    }

    fun setUrlError(value: String?) {
        uiState = uiState.copy(urlError = value)
    }

    fun setTitle(value: String) {
        uiState = uiState.copy(title = value)
    }

    fun setColor(value: Int?) {
        uiState = uiState.copy(color = value)
    }

    fun setCustomUserAgent(value: String?) {
        // Update with NULL if text field is empty and do not allow whitespace
        uiState = uiState.copy(customUserAgent = value?.takeIf { it.isNotBlank() })
    }

    fun setIgnoreAlerts(value: Boolean) {
        uiState = uiState.copy(ignoreAlerts = value)
    }

    fun setDefaultAlarmMinutes(value: String?) {
        uiState = uiState.copy(defaultAlarmMinutes = value?.toLongOrNull())
    }

    fun setDefaultAllDayAlarmMinutes(value: String?) {
        uiState = uiState.copy(defaultAllDayAlarmMinutes = value?.toLongOrNull())
    }

    fun setIgnoreDescription(value: Boolean) {
        uiState = uiState.copy(ignoreDescription = value)
    }

    fun update(subscription: Subscription, credential: Credential?) {
        uiState = uiState.copy(
            url = subscription.url.toString(),
            title = subscription.displayName,
            color = subscription.color,
            customUserAgent = subscription.customUserAgent,
            ignoreAlerts = subscription.ignoreEmbeddedAlerts,
            defaultAlarmMinutes = subscription.defaultAlarmMinutes,
            defaultAllDayAlarmMinutes = subscription.defaultAllDayAlarmMinutes,
            ignoreDescription = subscription.ignoreDescription,

            requiresAuth = credential != null,
            username = credential?.username,
            password = credential?.password
        )
    }

    fun equalsSubscription(subscription: Subscription) =
        uiState.url == subscription.url.toString()
            && uiState.title == subscription.displayName
            && uiState.color == subscription.color
            && uiState.customUserAgent == subscription.customUserAgent
            && uiState.ignoreAlerts == subscription.ignoreEmbeddedAlerts
            && uiState.defaultAlarmMinutes == subscription.defaultAlarmMinutes
            && uiState.defaultAllDayAlarmMinutes == subscription.defaultAllDayAlarmMinutes
            && uiState.ignoreDescription == subscription.ignoreDescription

    fun setRequiresAuth(value: Boolean) {
        uiState = uiState.copy(requiresAuth = value)
    }

    fun setUsername(value: String?) {
        uiState = uiState.copy(username = value)
    }

    fun setPassword(value: String?) {
        uiState = uiState.copy(password = value)
    }

    fun clearCredentials() {
        uiState = uiState.copy(username = null, password = null)
    }

    fun setIsInsecure(value: Boolean) {
        uiState = uiState.copy(isInsecure = value)
    }

    fun equalsCredential(credential: Credential) =
        uiState.username == credential.username
                && uiState.password == credential.password
}