/**
 * Teapod
 *
 * Copyright 2020-2022  <seil0@mosad.xyz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 */

package org.mosad.teapod.util.tmdb

import com.github.kittinunf.fuel.Fuel
import com.github.kittinunf.fuel.core.FuelError
import com.github.kittinunf.fuel.core.Parameters
import com.github.kittinunf.fuel.json.FuelJson
import com.github.kittinunf.fuel.json.responseJson
import com.github.kittinunf.result.Result
import kotlinx.coroutines.*
import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json
import org.mosad.teapod.util.concatenate

/**
 * Controller for tmdb api integration.
 * Data types are in TMDBDataTypes. For the type definitions see:
 * https://developers.themoviedb.org/3/getting-started/introduction
 *
 */
class TMDBApiController {

    private val json = Json { ignoreUnknownKeys = true }

    private val apiUrl = "https://api.themoviedb.org/3"
    private val apiKey = "de959cf9c07a08b5ca7cb51cda9a40c2"
    private val language = "de"

    companion object{
        const val imageUrl = "https://image.tmdb.org/t/p/w500"
    }

    private suspend fun request(
        endpoint: String,
        parameters: Parameters = emptyList()
    ): Result<FuelJson, FuelError> = coroutineScope {
        val path = "$apiUrl$endpoint"
        val params = concatenate(listOf("api_key" to apiKey, "language" to language), parameters)

        // TODO handle FileNotFoundException
        return@coroutineScope (Dispatchers.IO) {
            val (_, _, result) = Fuel.get(path, params)
                .responseJson()

            result
        }
    }

    /**
     * Search for a movie in tmdb
     * @param query The query text (movie title)
     * @return A TMDBSearch<TMDBSearchResultMovie> object, or
     * NoneTMDBSearchMovie if nothing was found
     */
    suspend fun searchMovie(query: String): TMDBSearch<TMDBSearchResultMovie> {
        val searchEndpoint = "/search/multi"
        val parameters = listOf("query" to query, "include_adult" to false)

        val result = request(searchEndpoint, parameters)
        return result.component1()?.obj()?.let {
            json.decodeFromString(it.toString())
        } ?: NoneTMDBSearchMovie
    }

    /**
     * Search for a tv show in tmdb
     * @param query The query text (tv show title)
     * @return A TMDBSearch<TMDBSearchResultTVShow> object, or
     * NoneTMDBSearchTVShow if nothing was found
     */
    suspend fun searchTVShow(query: String): TMDBSearch<TMDBSearchResultTVShow> {
        val searchEndpoint = "/search/tv"
        val parameters = listOf("query" to query, "include_adult" to false)

        val result = request(searchEndpoint, parameters)
        return result.component1()?.obj()?.let {
            json.decodeFromString(it.toString())
        } ?: NoneTMDBSearchTVShow
    }

    /**
     * Get details for a movie from tmdb
     * @param movieId The tmdb ID of the movie
     * @return A TMDBMovie object, or NoneTMDBMovie if not found
     */
    suspend fun getMovieDetails(movieId: Int): TMDBMovie {
        val movieEndpoint = "/movie/$movieId"

        // TODO is FileNotFoundException handling needed?
        val result = request(movieEndpoint)
        return result.component1()?.obj()?.let {
            json.decodeFromString(it.toString())
        } ?: NoneTMDBMovie
    }

    /**
     * Get details for a tv show from tmdb
     * @param tvId The tmdb ID of the tv show
     * @return A TMDBTVShow object, or NoneTMDBTVShow if not found
     */
    suspend fun getTVShowDetails(tvId: Int): TMDBTVShow {
        val tvShowEndpoint = "/tv/$tvId"

        // TODO is FileNotFoundException handling needed?
        val result = request(tvShowEndpoint)
        return result.component1()?.obj()?.let {
            json.decodeFromString(it.toString())
        } ?: NoneTMDBTVShow
    }

    @Suppress("unused")
    /**
     * Get details for a tv show season from tmdb
     * @param tvId The tmdb ID of the tv show
     * @param seasonNumber The tmdb season number
     * @return A TMDBTVSeason object, or NoneTMDBTVSeason if not found
     */
    suspend fun getTVSeasonDetails(tvId: Int, seasonNumber: Int): TMDBTVSeason {
        val tvShowSeasonEndpoint = "/tv/$tvId/season/$seasonNumber"

        // TODO is FileNotFoundException handling needed?
        val result = request(tvShowSeasonEndpoint)
        return result.component1()?.obj()?.let {
            json.decodeFromString(it.toString())
        } ?: NoneTMDBTVSeason
    }

}