import { Client as DiscordClient, Collection, GatewayIntentBits, REST, Routes } from "discord.js";
import { readdir } from "node:fs/promises";
import { join } from "node:path";
import type { Command } from "@lib/types";
import { env } from "@lib/env";

class Client extends DiscordClient {

    commands: Collection<string, Command>;

    constructor({ intents }: { intents: number[] }) {
        super({ intents });
        this.commands = new Collection<string, Command>();
    }

    async loadCommands(reload: boolean = false) {
        if (reload) {
            this.commands.clear();
            console.log("♻️  Reloading commands...");
        }

        const commandsPath = join(import.meta.dir, '../commands');
        await this.readCommandsRecursively(commandsPath, reload);
    }

    private async readCommandsRecursively(dir: string, reload: boolean = false) {
        try {
            const files = await readdir(dir, { withFileTypes: true });

            for (const file of files) {
                const filePath = join(dir, file.name);

                if (file.isDirectory()) {
                    await this.readCommandsRecursively(filePath, reload);
                    continue;
                }

                if (!file.name.endsWith('.ts') && !file.name.endsWith('.js')) continue;

                try {
                    const importPath = reload ? `${filePath}?t=${Date.now()}` : filePath;
                    const commandModule = await import(importPath);
                    const commands = Object.values(commandModule);
                    if (commands.length === 0) {
                        console.warn(`⚠️  No commands found in ${file.name}`);
                        continue;
                    }

                    for (const command of commands) {
                        if (this.isValidCommand(command)) {
                            this.commands.set(command.data.name, command);
                            console.log(`✅ Loaded command: ${command.data.name}`);
                        } else {
                            console.warn(`⚠️  Skipping invalid command in ${file.name}`);
                        }
                    }
                } catch (error) {
                    console.error(`❌ Failed to load command from ${filePath}:`, error);
                }
            }
        } catch (error) {
            console.error(`Error reading directory ${dir}:`, error);
        }
    }

    private isValidCommand(command: any): command is Command {
        return command && typeof command === 'object' && 'data' in command && 'execute' in command;
    }

    async deployCommands() {
        // We use env.DISCORD_BOT_TOKEN directly so this can run without client.login()
        const token = env.DISCORD_BOT_TOKEN;
        if (!token) {
            console.error("❌ DISCORD_BOT_TOKEN is not set.");
            return;
        }

        const rest = new REST().setToken(token);
        const commandsData = this.commands.map(c => c.data.toJSON());
        const guildId = env.DISCORD_GUILD_ID;
        const clientId = env.DISCORD_CLIENT_ID;

        if (!clientId) {
            console.error("❌ DISCORD_CLIENT_ID is not set.");
            return;
        }

        try {
            console.log(`Started refreshing ${commandsData.length} application (/) commands.`);

            let data;
            if (guildId) {
                console.log(`Registering commands to guild: ${guildId}`);
                data = await rest.put(
                    Routes.applicationGuildCommands(clientId, guildId),
                    { body: commandsData },
                );
                // Clear global commands to avoid duplicates
                await rest.put(Routes.applicationCommands(clientId), { body: [] });
            } else {
                console.log('Registering commands globally');
                data = await rest.put(
                    Routes.applicationCommands(clientId),
                    { body: commandsData },
                );
            }

            console.log(`✅ Successfully reloaded ${(data as any).length} application (/) commands.`);
        } catch (error: any) {
            if (error.code === 50001) {
                console.warn("⚠️  Missing Access: The bot is not in the guild or lacks 'applications.commands' scope.");
                console.warn("   If you are testing locally, make sure you invited the bot with scope 'bot applications.commands'.");
            } else {
                console.error(error);
            }
        }
    }
}

export const KyokoClient = new Client({ intents: [GatewayIntentBits.Guilds, GatewayIntentBits.MessageContent, GatewayIntentBits.GuildMessages] });