//
// Swiftfin is subject to the terms of the Mozilla Public
// License, v2.0. If a copy of the MPL was not distributed with this
// file, you can obtain one at https://mozilla.org/MPL/2.0/.
//
// Copyright (c) 2025 Jellyfin & Jellyfin Contributors
//

import Foundation

/// Xtream Codes API Client for Live TV and VOD streams
class XtreamAPIClient {

    private let server: XtreamServer

    init(server: XtreamServer) {
        self.server = server
    }

    // MARK: - Authentication

    /// Server info response from Xtream API
    struct ServerInfo: Codable {
        let userInfo: UserInfo?
        let serverInfo: ServerDetails?

        struct UserInfo: Codable {
            let username: String?
            let password: String?
            let message: String?
            let auth: Int?
            let status: String?
            let exp_date: String?
            let isTrial: String?
            let activeCons: String?
            let createdAt: String?
            let maxConnections: String?

            enum CodingKeys: String, CodingKey {
                case username
                case password
                case message
                case auth
                case status
                case exp_date
                case isTrial = "is_trial"
                case activeCons = "active_cons"
                case createdAt = "created_at"
                case maxConnections = "max_connections"
            }
        }

        struct ServerDetails: Codable {
            let url: String?
            let port: String?
            let httpsPort: String?
            let serverProtocol: String?
            let rtmpPort: String?
            let timezone: String?
            let timestampNow: Int?
            let timeNow: String?

            enum CodingKeys: String, CodingKey {
                case url
                case port
                case timezone
                case httpsPort = "https_port"
                case serverProtocol = "server_protocol"
                case rtmpPort = "rtmp_port"
                case timestampNow = "timestamp_now"
                case timeNow = "time_now"
            }
        }

        enum CodingKeys: String, CodingKey {
            case userInfo = "user_info"
            case serverInfo = "server_info"
        }
    }

    /// Test connection to Xtream server and authenticate
    func testConnection() async throws -> ServerInfo {
        guard let url = server.authenticatedURL(parameters: []) else {
            throw XtreamAPIError.invalidURL
        }

        var request = URLRequest(url: url)
        request.httpMethod = "GET"
        request.timeoutInterval = 10

        let (data, response) = try await URLSession.shared.data(for: request)

        guard let httpResponse = response as? HTTPURLResponse else {
            throw XtreamAPIError.invalidResponse
        }

        guard httpResponse.statusCode == 200 else {
            throw XtreamAPIError.httpError(statusCode: httpResponse.statusCode)
        }

        let serverInfo = try JSONDecoder().decode(ServerInfo.self, from: data)

        // Check if authentication was successful
        if let auth = serverInfo.userInfo?.auth, auth == 0 {
            throw XtreamAPIError.authenticationFailed(message: serverInfo.userInfo?.message ?? "Authentication failed")
        }

        return serverInfo
    }

    // MARK: - Live Channels

    struct LiveCategory: Codable, Identifiable {
        let categoryId: String
        let categoryName: String
        let parentId: Int?

        var id: String { categoryId }

        enum CodingKeys: String, CodingKey {
            case categoryId = "category_id"
            case categoryName = "category_name"
            case parentId = "parent_id"
        }
    }

    struct LiveChannel: Codable, Identifiable {
        let num: Int?
        let name: String?
        let streamType: String?
        let streamId: Int?
        let streamIcon: String?
        let epgChannelId: String?
        let added: String?
        let categoryId: String?
        let customSid: String?
        let tvArchive: Int?
        let directSource: String?
        let tvArchiveDuration: Int?

        var id: Int { streamId ?? 0 }

        enum CodingKeys: String, CodingKey {
            case num
            case name
            case added
            case streamType = "stream_type"
            case streamId = "stream_id"
            case streamIcon = "stream_icon"
            case epgChannelId = "epg_channel_id"
            case categoryId = "category_id"
            case customSid = "custom_sid"
            case tvArchive = "tv_archive"
            case directSource = "direct_source"
            case tvArchiveDuration = "tv_archive_duration"
        }
    }

    /// Get live TV categories
    func getLiveCategories() async throws -> [LiveCategory] {
        guard let url = server.authenticatedURL(parameters: [
            URLQueryItem(name: "action", value: "get_live_categories"),
        ]) else {
            throw XtreamAPIError.invalidURL
        }

        let (data, _) = try await URLSession.shared.data(from: url)
        return try JSONDecoder().decode([LiveCategory].self, from: data)
    }

    /// Get live TV channels
    func getLiveChannels(categoryId: String? = nil) async throws -> [LiveChannel] {
        var parameters = [URLQueryItem(name: "action", value: "get_live_streams")]

        if let categoryId {
            parameters.append(URLQueryItem(name: "category_id", value: categoryId))
        }

        guard let url = server.authenticatedURL(parameters: parameters) else {
            throw XtreamAPIError.invalidURL
        }

        let (data, _) = try await URLSession.shared.data(from: url)
        return try JSONDecoder().decode([LiveChannel].self, from: data)
    }

    /// Get live stream URL for a channel
    func getLiveStreamURL(streamId: Int) -> URL? {
        let urlString = "\(server.url.absoluteString)/live/\(server.username)/\(server.password)/\(streamId).ts"
        return URL(string: urlString)
    }
}

// MARK: - Errors

enum XtreamAPIError: LocalizedError {
    case invalidURL
    case invalidResponse
    case httpError(statusCode: Int)
    case authenticationFailed(message: String)

    var errorDescription: String? {
        switch self {
        case .invalidURL:
            return "Invalid Xtream server URL"
        case .invalidResponse:
            return "Invalid response from Xtream server"
        case let .httpError(statusCode):
            return "HTTP error: \(statusCode)"
        case let .authenticationFailed(message):
            return "Authentication failed: \(message)"
        }
    }
}