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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 State = @import("../State.zig");
const ExitCode = @import("../exit.zig").ExitCode;

const parser = .{
    .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) ExitCode {
    var diag = clap.Diagnostic{};
    var res = clap.parseEx(clap.Help, &params, parser, 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 zone_name: []const u8 = res.args.zone orelse {
        std.log.err("--zone is required", .{});
        return ExitCode.incorrect_usage;
    };

    const server_id, const saved_token = state: {
        const state = State.read(allocator) catch |err| {
            std.log.err("Failed to read state file: {s}", .{@errorName(err)});
            return ExitCode.not_ok;
        };
        defer state.deinit();

        const conn = state.value.connection orelse {
            std.log.err("No previous connection: connect to server first", .{});
            return ExitCode.not_ok;
        };

        const server_id = allocator.dupeZ(u8, conn.server_id) catch {
            std.log.err("Failed to restore server ID from state file: Out of memory", .{});
            return ExitCode.out_of_memory;
        };

        const saved_token = allocator.dupeZ(u8, conn.token) catch {
            std.log.err("Failed to restore token from state file: Out of memory", .{});
            allocator.free(server_id);
            return ExitCode.out_of_memory;
        };

        break :state .{ server_id, saved_token };
    };

    defer allocator.free(server_id);
    defer allocator.free(saved_token);

    const find_result = core.discovery.find(server_id.ptr) orelse {
        std.log.err("Unable to get server info: Out of memory", .{});
        return ExitCode.out_of_memory;
    };
    defer find_result.release();

    if (find_result.code != .ok) {
        std.log.err("Failed to get server info: {s}", .{@tagName(find_result.code)});
        return ExitCode.not_ok;
    }

    if (find_result.servers_len == 0) {
        std.log.err("Server not found for ID={s}", .{server_id});
        return ExitCode.not_ok;
    }

    const server = find_result.servers_ptr[0];

    const conn = core.connection.Connection.make(server, saved_token.ptr) orelse {
        std.log.err("Unable to connect: Out of memory", .{});
        return ExitCode.out_of_memory;
    };
    defer conn.release();

    while (true) {
        const ev = conn.getEvent() orelse {
            std.log.err("Got empty event, terminating", .{});
            return ExitCode.not_ok;
        };
        defer ev.release();

        switch (ev.internal.payload) {
            .connection_error => |err_ev| {
                std.log.err("Failed to read event: {s}", .{@tagName(err_ev.code)});
                return ExitCode.not_ok;
            },
            .connected => {
                conn.subscribeZones();
                continue;
            },
            .zone_list => |event| {
                const added_zones = event.added_zones_ptr[0..event.added_zones_len];
                const changed_zones = event.changed_zones_ptr[0..event.changed_zones_len];

                inline for (.{ added_zones, changed_zones }) |zones| {
                    for (zones) |zone| {
                        if (std.mem.eql(u8, std.mem.span(zone.name), zone_name)) {
                            std.fmt.format(
                                std.io.getStdOut().writer(),
                                "{s}\n",
                                .{@tagName(zone.playback)},
                            ) catch |err| {
                                std.log.err("Failed to write to stdout: {s}", .{@errorName(err)});
                                return ExitCode.stdout_write_failed;
                            };
                            return ExitCode.ok;
                        }
                    }
                }
                continue;
            },
        }
    }
}