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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 std = @import("std");

const callback = @import("../callback.zig");
const Transport = @import("../../roon/services/transport.zig").TransportService;

const Self = @This();

const OnChange = callback.Callback(struct {});
const OnDelete = callback.Callback(struct {});

allocator: std.mem.Allocator,
on_change_callbacks: OnChange.Store,
on_delete_callbacks: OnDelete.Store,

pub fn init(allocator: std.mem.Allocator) Self {
    return .{
        .allocator = allocator,
        .on_change_callbacks = OnChange.Store.init(allocator),
        .on_delete_callbacks = OnDelete.Store.init(allocator),
    };
}

pub fn deinit(self: *Self) void {
    self.on_change_callbacks.deinit();
    self.on_delete_callbacks.deinit();
}

pub const CApi = extern struct {
    internal: *Self,
    id: [*:0]const u8,
    id_len: usize,
    name: [*:0]const u8,
    name_len: usize,
    playback_state: PlaybackState,

    pub const PlaybackState = enum(c_int) {
        stopped = 0,
        paused = 1,
        playing = 2,
    };

    pub fn init(allocator: std.mem.Allocator, zone: Transport.Zone) std.mem.Allocator.Error!*CApi {
        const internal = try allocator.create(Self);
        errdefer allocator.destroy(internal);
        internal.* = Self.init(allocator);
        errdefer internal.deinit();

        const id = try allocator.dupeZ(u8, zone.zone_id);
        errdefer allocator.free(id);

        const name = try allocator.dupeZ(u8, zone.display_name);
        errdefer allocator.free(name);

        const capi = try allocator.create(CApi);
        errdefer allocator.destroy(capi);
        capi.* = .{
            .internal = internal,
            .id = id.ptr,
            .id_len = id.len,
            .name = name.ptr,
            .name_len = name.len,
            .playback_state = switch (zone.state) {
                .loading, .stopped => .stopped,
                .paused => .paused,
                .playing => .playing,
            },
        };

        return capi;
    }

    pub fn deinit(self: *CApi, allocator: std.mem.Allocator) void {
        allocator.free(self.id[0..self.id_len]);
        allocator.free(self.name[0..self.name_len]);
        self.internal.deinit();
        allocator.destroy(self.internal);
        allocator.destroy(self);
    }

    pub fn onChange(capi_ptr: ?*CApi, cb: OnChange.Fn, userdata: callback.UserData) callconv(.C) void {
        const capi = capi_ptr orelse return;
        // TODO: Notify error to caller
        capi.internal.on_change_callbacks.add(OnChange.init(cb, userdata)) catch {};
    }

    pub fn onChangeDisarm(capi_ptr: ?*CApi, cb: OnChange.Fn) callconv(.C) void {
        const capi = capi_ptr orelse return;
        capi.internal.on_change_callbacks.remove(cb);
    }

    pub fn onDelete(capi_ptr: ?*CApi, cb: OnDelete.Fn, userdata: callback.UserData) callconv(.C) void {
        const capi = capi_ptr orelse return;
        // TODO: Notify error to caller
        capi.internal.on_delete_callbacks.add(OnDelete.init(cb, userdata)) catch {};
    }

    pub fn onDeleteDisarm(capi_ptr: ?*CApi, cb: OnDelete.Fn) callconv(.C) void {
        const capi = capi_ptr orelse return;
        capi.internal.on_delete_callbacks.remove(cb);
    }
};