package com.lagradost.cloudstream3.ui.settings.extensions

import android.app.Activity
import android.util.Log
import android.widget.Toast
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.lagradost.cloudstream3.CommonActivity.showToast
import com.lagradost.cloudstream3.R
import com.lagradost.cloudstream3.apmap
import com.lagradost.cloudstream3.plugins.PluginData
import com.lagradost.cloudstream3.plugins.PluginManager
import com.lagradost.cloudstream3.plugins.RepositoryManager
import com.lagradost.cloudstream3.plugins.SitePlugin
import com.lagradost.cloudstream3.ui.result.txt
import com.lagradost.cloudstream3.utils.Coroutines.ioSafe
import com.lagradost.cloudstream3.utils.Coroutines.main
import com.lagradost.cloudstream3.utils.Coroutines.runOnMainThread
import kotlinx.coroutines.launch

typealias Plugin = Pair<String, SitePlugin>

class PluginsViewModel : ViewModel() {
    private val _plugins = MutableLiveData<List<PluginViewData>>()
    val plugins: LiveData<List<PluginViewData>> = _plugins

    companion object {
        private val repositoryCache: MutableMap<String, List<Plugin>> = mutableMapOf()
        const val TAG = "PLG"

        private fun isDownloaded(plugin: Plugin, data: Set<String>? = null): Boolean {
            return (data ?: getDownloads()).contains(plugin.second.internalName)
        }

        private suspend fun getPlugins(
            repositoryUrl: String,
            canUseCache: Boolean = true
        ): List<Plugin> {
            Log.i(TAG, "getPlugins = $repositoryUrl")
            if (canUseCache && repositoryCache.containsKey(repositoryUrl)) {
                repositoryCache[repositoryUrl]?.let {
                    return it
                }
            }
            return RepositoryManager.getRepoPlugins(repositoryUrl)
                ?.also { repositoryCache[repositoryUrl] = it } ?: emptyList()
        }

        private fun getStoredPlugins(): Array<PluginData> {
            return PluginManager.getPluginsOnline()
        }

        private fun getDownloads(): Set<String> {
            return getStoredPlugins().map { it.internalName }.toSet()
        }

        /**
         * @param viewModel optional, updates the plugins livedata for that viewModel if included
         * */
        fun downloadAll(activity: Activity?, repositoryUrl: String, viewModel: PluginsViewModel?) = ioSafe {
            if (activity == null) return@ioSafe
            val stored = getDownloads()
            val plugins = getPlugins(repositoryUrl)

            plugins.filter { plugin -> !isDownloaded(plugin, stored) }.also { list ->
                main {
                    showToast(
                        activity,
                        if (list.isEmpty()) {
                            txt(
                                R.string.batch_download_nothing_to_download_format,
                                txt(R.string.plugin)
                            )
                        } else {
                            txt(
                                R.string.batch_download_start_format,
                                list.size,
                                txt(if (list.size == 1) R.string.plugin_singular else R.string.plugin)
                            )
                        },
                        Toast.LENGTH_SHORT
                    )
                }
            }.apmap { (repo, metadata) ->
                PluginManager.downloadAndLoadPlugin(
                    activity,
                    metadata.url,
                    metadata.name,
                    repo
                )
            }.main { list ->
                if (list.any { it }) {
                    showToast(
                        activity,
                        txt(
                            R.string.batch_download_finish_format,
                            list.count { it },
                            txt(if (list.size == 1) R.string.plugin_singular else R.string.plugin)
                        ),
                        Toast.LENGTH_SHORT
                    )
                    viewModel?.updatePluginListPrivate(repositoryUrl)
                } else if (list.isNotEmpty()) {
                    showToast(activity, R.string.download_failed, Toast.LENGTH_SHORT)
                }
            }
        }
    }

    fun handlePluginAction(activity: Activity?, repositoryUrl: String, plugin: Plugin) = ioSafe {
        Log.i(TAG, "handlePluginAction = $repositoryUrl, $plugin")

        if (activity == null) return@ioSafe
        val (repo, metadata) = plugin

        val (success, message) = if (isDownloaded(plugin)) {
            PluginManager.deletePlugin(
                metadata.url,
            ) to R.string.plugin_deleted
        } else {
            PluginManager.downloadAndLoadPlugin(
                activity,
                metadata.url,
                metadata.name,
                repo
            ) to R.string.plugin_loaded
        }

        runOnMainThread {
            if (success)
                showToast(activity, message, Toast.LENGTH_SHORT)
            else
                showToast(activity, R.string.error, Toast.LENGTH_SHORT)
        }

        if (success)
            updatePluginListPrivate(repositoryUrl)
    }

    private suspend fun updatePluginListPrivate(repositoryUrl: String) {
        val stored = getDownloads()
        val plugins = getPlugins(repositoryUrl)
        val list = plugins.map { plugin ->
            PluginViewData(plugin, isDownloaded(plugin, stored))
        }

        _plugins.postValue(list)
    }

    fun updatePluginList(repositoryUrl: String) = viewModelScope.launch {
        Log.i(TAG, "updatePluginList = $repositoryUrl")
        updatePluginListPrivate(repositoryUrl)
    }
}