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

const app = @import("./app.zig");
const ExitCode = @import("./exit.zig").ExitCode;
const server = @import("./commands/server.zig");
const register = @import("./commands/register.zig");
const playback = @import("./commands/playback.zig");

const version = "0.0.0";

pub const std_options = std.Options{
    .log_level = .debug,
    .logFn = log,
};

var log_level: std.log.Level = .debug;

pub fn log(
    comptime level: std.log.Level,
    comptime scope: @Type(.enum_literal),
    comptime format: []const u8,
    args: anytype,
) void {
    if (@intFromEnum(level) <= @intFromEnum(log_level)) {
        std.log.defaultLog(level, scope, format, args);
    }
}

const Commands = enum {
    server,
    register,
    playback,
    version,
};

const global_parser = .{
    .command = clap.parsers.enumeration(Commands),
    .id = clap.parsers.string,
    .path = clap.parsers.string,
    .level = clap.parsers.enumeration(std.log.Level),
};

const global_params = clap.parseParamsComptime(
    \\-h, --help Prints this message to stdout and exits.
    \\-l, --log-level <level> Log level to output.
    \\-v, --verbose Enables debug logging.
    \\-c, --core-id <id> Roon Server's ID.
    \\-s, --state <path> Path to state file to load from and save to.
    \\<command>
    \\Available commands:
    \\* version ... Prints version to stdout and exits.
    \\* server  ... Lists or gets information of Roon Server on network
    \\* register ... Register extension to Roon Server and exists.
    \\* playback ... Display playback state of a zone.
    \\
);

pub fn main() !u8 {
    const allocator: std.mem.Allocator, const mem = if (build_config.memcheck) memcheck: {
        var da = std.heap.DebugAllocator(.{ .safety = true }){
            .backing_allocator = std.heap.c_allocator,
        };

        break :memcheck .{ da.allocator(), &da };
    } else arena: {
        var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);

        break :arena .{ arena.allocator(), &arena };
    };

    defer {
        _ = mem.deinit();
    }

    var iter = try std.process.ArgIterator.initWithAllocator(allocator);
    defer iter.deinit();

    // Skip process name.
    _ = iter.next();

    var diag = clap.Diagnostic{};
    var res = clap.parseEx(clap.Help, &global_params, global_parser, &iter, .{
        .diagnostic = &diag,
        .allocator = allocator,
        .terminating_positional = 0,
    }) catch |err| {
        diag.report(std.io.getStdErr().writer(), err) catch {};
        return @intFromEnum(ExitCode.incorrect_usage);
    };
    defer res.deinit();

    log_level = res.args.@"log-level" orelse .info;

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

    const command = res.positionals[0] orelse {
        clap.help(std.io.getStdErr().writer(), clap.Help, &global_params, .{}) catch {};
        return @intFromEnum(ExitCode.incorrect_usage);
    };

    switch (command) {
        .server => return @intFromEnum(server.run(allocator, &iter)),
        .version => {
            try std.fmt.format(std.io.getStdOut().writer(), "{s}\n", .{version});
            return @intFromEnum(ExitCode.ok);
        },
        else => |main_command| {
            const inputs = app.Inputs.parse(.{
                .core_id = res.args.@"core-id",
                .file_path = res.args.state,
            }) catch |err| {
                std.log.err("Invalid usage: {s}", .{@errorName(err)});
                clap.help(std.io.getStdErr().writer(), clap.Help, &global_params, .{}) catch {};
                return @intFromEnum(ExitCode.incorrect_usage);
            };

            var plac = app.App.init(allocator, inputs) catch |err| {
                std.log.err("Unable to initialize app: {s}", .{@errorName(err)});
                return @intFromEnum(switch (err) {
                    error.OutOfMemory => ExitCode.out_of_memory,
                    else => ExitCode.not_ok,
                });
            };
            defer plac.deinit();

            return switch (main_command) {
                .register => @intFromEnum(register.run(allocator, &iter, &plac)),
                .playback => @intFromEnum(playback.run(allocator, &iter, &plac)),
                // Zig does not support narrowing, thus main_command is still type of `Commands`.
                else => @intFromEnum(ExitCode.incorrect_usage),
            };
        },
    }
}