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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

const builtin = @import("builtin");
const std = @import("std");

const moo = @import("moo");
const websocket = @import("websocket");

const Connection = @import("./roon/connection.zig").Connection;
const Server = @import("./server/Server.zig").Server;
const Extension = @import("./roon/extension.zig").Extension;
const PingService = @import("./roon/services/ping.zig").PingService;
const RegistryService = @import("./roon/services/registry.zig").RegistryService;
const TransportService = @import("./roon/services/transport.zig").TransportService;

const allocator = std.heap.c_allocator;

pub const PlaybackState = enum(c_int) {
    /// Completely lost, or loading from server.
    unknown = 0,
    /// No track is selected.
    stopped = 1,
    /// Track is selected but playback is paused.
    not_playing = 2,
    /// In transition of not_playing -> playing
    requesting_play = 3,
    /// Playing a track.
    playing = 4,
    /// In transition of playing -> not_playing
    requesting_pause = 5,
};

pub const Zone = extern struct {
    id: [*:0]const u8,
    id_len: usize,

    playback_state: PlaybackState,
};

const AppExtension = Extension(.{
    .id = "jp.pocka.plac",
    .display_name = "Plac",
    .version = "0.0.0-dev",
    .publisher = "Shota FUJI",
    .email = "pockawoooh@gmail.com",
    .required_services = &.{TransportService},
    .optional_services = &.{},
    .provided_services = &.{PingService},
});

pub const Application = extern struct {
    addr: std.net.Address,
    conn: ?*Connection = null,

    /// Returns `null` on OOM.
    pub fn makeFromServer(server_ptr: ?*const Server) callconv(.C) ?*Application {
        const server = server_ptr orelse return null;
        const conn = allocator.create(Application) catch return null;

        conn.* = .{
            .addr = std.net.Address.initPosix(&server.sockaddr),
        };

        return conn;
    }

    pub fn free(self_ptr: ?*Application) callconv(.C) void {
        if (self_ptr) |self| {
            if (self.conn) |conn| {
                conn.deinit();
                allocator.destroy(conn);
            }

            allocator.destroy(self);
        }
    }

    // TODO: Return status code AND token
    pub fn connect(self_ptr: ?*Application, token: ?[*:0]const u8) callconv(.C) ?[*:0]const u8 {
        var self = self_ptr orelse return null;

        const conn = allocator.create(Connection) catch return null;
        conn.* = Connection.init(allocator, self.addr) catch {
            // TODO: Handle error
            return null;
        };
        errdefer conn.deinit();

        conn.listen(PingService.handleRequest) catch {
            return null;
        };

        const info = RegistryService.info(allocator, conn) catch |err| {
            std.debug.print("Info request failed: {s}\n", .{@errorName(err)});
            return null;
        };
        defer info.deinit();

        const extension = AppExtension{
            .token = if (token) |tok| std.mem.span(tok) else null,
        };

        const register = RegistryService.register(AppExtension, allocator, conn, extension) catch |err| {
            std.debug.print("Register request failed: {s}\n", .{@errorName(err)});
            return null;
        };
        defer register.deinit();

        self.conn = conn;

        return allocator.dupeZ(u8, register.value.token) catch return null;
    }
};