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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 clap = @import("clap");
const core = @import("core");

const cb = @import("../cb.zig");
const App = @import("../app.zig").App;
const ExitCode = @import("../exit.zig").ExitCode;

const parsers = .{
    .string = clap.parsers.string,
};

const params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\-z, --zone <string> Name of zone to display playback state.
    \\
);

pub fn run(allocator: std.mem.Allocator, iter: *std.process.ArgIterator, plac: *const App) ExitCode {
    var diag = clap.Diagnostic{};
    var res = clap.parseEx(clap.Help, &params, parsers, iter, .{
        .diagnostic = &diag,
        .allocator = allocator,
    }) catch |err| {
        diag.report(std.io.getStdErr().writer(), err) catch {};
        return ExitCode.incorrect_usage;
    };
    defer res.deinit();

    if (res.args.help > 0) {
        clap.help(std.io.getStdOut().writer(), clap.Help, &params, .{}) catch {
            return ExitCode.stdout_write_failed;
        };
        return ExitCode.ok;
    }

    const name = res.args.zone orelse {
        std.log.err("--zone is required.", .{});
        return ExitCode.incorrect_usage;
    };

    const server = plac.app.server orelse unreachable;

    const OnZoneListLoadingChange = cb.Callback(struct {});
    var on_zone_list_loading_change = OnZoneListLoadingChange.init();

    server.onZoneListLoadingChange(OnZoneListLoadingChange.function, on_zone_list_loading_change.userdata());

    server.loadZones();

    while (true) {
        on_zone_list_loading_change.wait();

        switch (server.zones_loading) {
            .not_loaded => {},
            .loading, .refreshing => {
                std.log.debug("Zone list loading state changed to {s}", .{@tagName(server.zones_loading)});
                continue;
            },
            .loaded => {
                const zones = server.zones[0..server.zones_len];
                for (zones) |zone| {
                    if (std.mem.eql(u8, name, zone.name[0..zone.name_len])) {
                        std.fmt.format(
                            std.io.getStdOut().writer(),
                            "{s}\n",
                            .{@tagName(zone.playback_state)},
                        ) catch return ExitCode.stdout_write_failed;

                        return ExitCode.ok;
                    }
                }

                std.log.err("No zone found named {s}", .{name});
                return ExitCode.not_ok;
            },
            else => |err| {
                std.log.err("Failed to load zones: {s}", .{@tagName(err)});
                return switch (err) {
                    .err_out_of_memory => ExitCode.out_of_memory,
                    else => ExitCode.not_ok,
                };
            },
        }
    }
}