import { History } from './history.js';
import { Coder } from './coder.js';
import { Prompter } from './prompter.js';
import { initModes } from './modes.js';
import { initBot } from '../utils/mcdata.js';
import { containsCommand, commandExists, executeCommand, truncCommandMessage, isAction } from './commands/index.js';
import { ActionManager } from './action_manager.js';
import { NPCContoller } from './npc/controller.js';
import { MemoryBank } from './memory_bank.js';
import { SelfPrompter } from './self_prompter.js';
import { handleTranslation, handleEnglishTranslation } from '../utils/translator.js';
import { addViewer } from './viewer.js';
import settings from '../../settings.js';

export class Agent {
    async start(profile_fp, load_mem=false, init_message=null, count_id=0) {
        try {
            // Add validation for profile_fp
            if (!profile_fp) {
                throw new Error('No profile filepath provided');
            }

            console.log('Starting agent initialization with profile:', profile_fp);
            
            // Initialize components with more detailed error handling
            try {
                console.log('Initializing action manager...');
                this.actions = new ActionManager(this);
                console.log('Initializing prompter...');
                this.prompter = new Prompter(this, profile_fp);
                this.name = this.prompter.getName();
                console.log('Initializing history...');
                this.history = new History(this);
                console.log('Initializing coder...');
                this.coder = new Coder(this);
                console.log('Initializing npc controller...');
                this.npc = new NPCContoller(this);
                console.log('Initializing memory bank...');
                this.memory_bank = new MemoryBank();
                console.log('Initializing self prompter...');
                this.self_prompter = new SelfPrompter(this);
            } catch (error) {
                throw new Error(`Failed to initialize agent components: ${error.message || error}`);
            }

            try {
                console.log('Initializing examples...');
                await this.prompter.initExamples();
            } catch (error) {
                throw new Error(`Failed to initialize examples: ${error.message || error}`);
            }

            console.log('Logging into minecraft...');
            try {
                this.bot = initBot(this.name);
            } catch (error) {
                throw new Error(`Failed to initialize Minecraft bot: ${error.message || error}`);
            }

            initModes(this);

            let save_data = null;
            if (load_mem) {
                try {
                    save_data = this.history.load();
                } catch (error) {
                    console.error('Failed to load history:', error);
                    // Don't throw here, continue without history
                }
            }

            // Return a promise that resolves when spawn is complete
            return new Promise((resolve, reject) => {
                // Add timeout to prevent hanging
                const spawnTimeout = setTimeout(() => {
                    reject(new Error('Bot spawn timed out after 30 seconds'));
                }, 30000);

                this.bot.once('error', (error) => {
                    clearTimeout(timeout);
                    console.error('Bot encountered error:', error);
                    reject(error);
                });

                this.bot.on('login', () => {
                    console.log('Logged in!');
                });

                this.bot.once('spawn', async () => {
                    try {
                        clearTimeout(spawnTimeout);
                        addViewer(this.bot, count_id);

                        // wait for a bit so stats are not undefined
                        await new Promise((resolve) => setTimeout(resolve, 1000));

                        console.log(`${this.name} spawned.`);
                        this.clearBotLogs();
                        
                        this._setupEventHandlers(save_data, init_message);
                        this.startEvents();
                        resolve();
                    } catch (error) {
                        reject(error);
                    }
                });
            });
        } catch (error) {
            // Ensure we're not losing error details
            console.error('Agent start failed with error:', {
                message: error.message || 'No error message',
                stack: error.stack || 'No stack trace',
                error: error
            });
            throw error; // Re-throw with preserved details
        }
    }

    // Split out event handler setup for clarity
    _setupEventHandlers(save_data, init_message) {
        const ignore_messages = [
            "Set own game mode to",
            "Set the time to",
            "Set the difficulty to",
            "Teleported ",
            "Set the weather to",
            "Gamerule "
        ];
        
        const eventname = settings.profiles.length > 1 ? 'whisper' : 'chat';
        this.bot.on(eventname, async (username, message) => {
            try {
                if (username === this.name) return;
                
                if (ignore_messages.some((m) => message.startsWith(m))) return;

                this.shut_up = false;
                await this.handleMessage(username, message);
            } catch (error) {
                console.error('Error handling message:', error);
            }
        });

        // Set up auto-eat
        this.bot.autoEat.options = {
            priority: 'foodPoints',
            startAt: 14,
            bannedFood: ["rotten_flesh", "spider_eye", "poisonous_potato", "pufferfish", "chicken"]
        };

        // Handle startup conditions
        this._handleStartupConditions(save_data, init_message);
    }

    async _handleStartupConditions(save_data, init_message) {
        try {
            if (save_data?.self_prompt) {
                let prompt = save_data.self_prompt;
                // add initial message to history
                this.history.add('system', prompt);
                await this.self_prompter.start(prompt);
            }
            else if (init_message) {
                await this.handleMessage('system', init_message, 2);
            }
            else {
                const translation = await handleTranslation("Hello world! I am "+this.name);
                this.bot.chat(translation);
                this.bot.emit('finished_executing');
            }
        } catch (error) {
            console.error('Error handling startup conditions:', error);
            throw error;
        }
    }

    requestInterrupt() {
        this.bot.interrupt_code = true;
        this.bot.collectBlock.cancelTask();
        this.bot.pathfinder.stop();
        this.bot.pvp.stop();
    }

    clearBotLogs() {
        this.bot.output = '';
        this.bot.interrupt_code = false;
    }

    async cleanChat(message, translate_up_to=-1) {
        let to_translate = message;
        let remainging = '';
        if (translate_up_to != -1) {
            to_translate = to_translate.substring(0, translate_up_to);
            remainging = message.substring(translate_up_to);
        }
        message = (await handleTranslation(to_translate)).trim() + " " + remainging;
        // newlines are interpreted as separate chats, which triggers spam filters. replace them with spaces
        message = message.replaceAll('\n', ' ');
        return this.bot.chat(message);
    }

    shutUp() {
        this.shut_up = true;
        if (this.self_prompter.on) {
            this.self_prompter.stop(false);
        }
    }

    async handleMessage(source, message, max_responses=null) {
        let used_command = false;
        if (max_responses === null) {
            max_responses = settings.max_commands === -1 ? Infinity : settings.max_commands;
        }
        if (max_responses === -1){
            max_responses = Infinity;
        }

        let self_prompt = source === 'system' || source === this.name;

        // First check for user commands
        if (!self_prompt) {
            const user_command_name = containsCommand(message);
            if (user_command_name) {
                if (!commandExists(user_command_name)) {
                    this.bot.chat(`Command '${user_command_name}' does not exist.`);
                    return false;
                }
                this.bot.chat(`*${source} used ${user_command_name.substring(1)}*`);
                if (user_command_name === '!newAction') {
                    // all user initiated commands are ignored by the bot except for this one
                    // add the preceding message to the history to give context for newAction
                    this.history.add(source, message);
                }
                let execute_res = await executeCommand(this, message);
                if (execute_res) 
                    this.cleanChat(execute_res);
                return true;
            }
        }

        // Now translate the message
        message = await handleEnglishTranslation(message);
        console.log('received message from', source, ':', message);

        // Do self prompting
        const checkInterrupt = () => this.self_prompter.shouldInterrupt(self_prompt) || this.shut_up;

        let behavior_log = this.bot.modes.flushBehaviorLog();
        if (behavior_log.trim().length > 0) {
            const MAX_LOG = 500;
            if (behavior_log.length > MAX_LOG) {
                behavior_log = '...' + behavior_log.substring(behavior_log.length - MAX_LOG);
            }
            behavior_log = 'Recent behaviors log: \n' + behavior_log.substring(behavior_log.indexOf('\n'));
            await this.history.add('system', behavior_log);
        }

        // Handle other user messages
        await this.history.add(source, message);
        this.history.save();

        if (!self_prompt && this.self_prompter.on) // message is from user during self-prompting
            max_responses = 1; // force only respond to this message, then let self-prompting take over
        for (let i=0; i<max_responses; i++) {
            if (checkInterrupt()) break;
            let history = this.history.getHistory();
            let res = await this.prompter.promptConvo(history);

            let command_name = containsCommand(res);

            if (command_name) { // contains query or command
                console.log(`Full response: ""${res}""`)
                res = truncCommandMessage(res); // everything after the command is ignored
                this.history.add(this.name, res);
                if (!commandExists(command_name)) {
                    this.history.add('system', `Command ${command_name} does not exist.`);
                    console.warn('Agent hallucinated command:', command_name)
                    continue;
                }
                if (command_name === '!stopSelfPrompt' && self_prompt) {
                    this.history.add('system', `Cannot stopSelfPrompt unless requested by user.`);
                    continue;
                }

                if (checkInterrupt()) break;
                this.self_prompter.handleUserPromptedCmd(self_prompt, isAction(command_name));

                if (settings.verbose_commands) {
                    this.cleanChat(res, res.indexOf(command_name));
                }
                else { // only output command name
                    let pre_message = res.substring(0, res.indexOf(command_name)).trim();
                    let chat_message = `*used ${command_name.substring(1)}*`;
                    if (pre_message.length > 0)
                        chat_message = `${pre_message}  ${chat_message}`;
                    this.cleanChat(res);
                }

                let execute_res = await executeCommand(this, res);

                console.log('Agent executed:', command_name, 'and got:', execute_res);
                used_command = true;

                if (execute_res)
                    this.history.add('system', execute_res);
                else
                    break;
            }
            else { // conversation response
                this.history.add(this.name, res);
                this.cleanChat(res);
                console.log('Purely conversational response:', res);
                break;
            }
            this.history.save();
        }

        this.bot.emit('finished_executing');
        return used_command;
    }

    startEvents() {
        // Custom events
        this.bot.on('time', () => {
            if (this.bot.time.timeOfDay == 0)
            this.bot.emit('sunrise');
            else if (this.bot.time.timeOfDay == 6000)
            this.bot.emit('noon');
            else if (this.bot.time.timeOfDay == 12000)
            this.bot.emit('sunset');
            else if (this.bot.time.timeOfDay == 18000)
            this.bot.emit('midnight');
        });

        let prev_health = this.bot.health;
        this.bot.lastDamageTime = 0;
        this.bot.lastDamageTaken = 0;
        this.bot.on('health', () => {
            if (this.bot.health < prev_health) {
                this.bot.lastDamageTime = Date.now();
                this.bot.lastDamageTaken = prev_health - this.bot.health;
            }
            prev_health = this.bot.health;
        });
        // Logging callbacks
        this.bot.on('error' , (err) => {
            console.error('Error event!', err);
        });
        this.bot.on('end', (reason) => {
            console.warn('Bot disconnected! Killing agent process.', reason)
            this.cleanKill('Bot disconnected! Killing agent process.');
        });
        this.bot.on('death', () => {
            this.actions.cancelResume();
            this.actions.stop();
        });
        this.bot.on('kicked', (reason) => {
            console.warn('Bot kicked!', reason);
            this.cleanKill('Bot kicked! Killing agent process.');
        });
        this.bot.on('messagestr', async (message, _, jsonMsg) => {
            if (jsonMsg.translate && jsonMsg.translate.startsWith('death') && message.startsWith(this.name)) {
                console.log('Agent died: ', message);
                let death_pos = this.bot.entity.position;
                this.memory_bank.rememberPlace('last_death_position', death_pos.x, death_pos.y, death_pos.z);
                let death_pos_text = null;
                if (death_pos) {
                    death_pos_text = `x: ${death_pos.x.toFixed(2)}, y: ${death_pos.y.toFixed(2)}, z: ${death_pos.x.toFixed(2)}`;
                }
                let dimention = this.bot.game.dimension;
                this.handleMessage('system', `You died at position ${death_pos_text || "unknown"} in the ${dimention} dimension with the final message: '${message}'. Your place of death is saved as 'last_death_position' if you want to return. Previous actions were stopped and you have respawned.`);
            }
        });
        this.bot.on('idle', () => {
            this.bot.clearControlStates();
            this.bot.pathfinder.stop(); // clear any lingering pathfinder
            this.bot.modes.unPauseAll();
            this.actions.resumeAction();
        });

        // Init NPC controller
        this.npc.init();

        // This update loop ensures that each update() is called one at a time, even if it takes longer than the interval
        const INTERVAL = 300;
        let last = Date.now();
        setTimeout(async () => {
            while (true) {
                let start = Date.now();
                await this.update(start - last);
                let remaining = INTERVAL - (Date.now() - start);
                if (remaining > 0) {
                    await new Promise((resolve) => setTimeout(resolve, remaining));
                }
                last = start;
            }
        }, INTERVAL);

        this.bot.emit('idle');
    }

    async update(delta) {
        await this.bot.modes.update();
        await this.self_prompter.update(delta);
    }

    isIdle() {
        return !this.actions.executing && !this.coder.generating;
    }
    
    cleanKill(msg='Killing agent process...') {
        this.history.add('system', msg);
        this.bot.chat('Goodbye world.')
        this.history.save();
        process.exit(1);
    }
}