import express from 'express';
import cors from 'cors';
import fs from 'fs';
import path from 'path';
import { createClient } from '@supabase/supabase-js';

const PORT = 7860;
const SUPABASE_URL = process.env.SUPABASE_URL;
const SUPABASE_KEY = process.env.SUPABASE_SERVICE_KEY;
const REMOTE_SERVER_URL = process.env.REMOTE_AI_URL || "http://localhost:11434"; 
const FRONT_URL = process.env.FRONT_URL;
const CRON_REGISTRY_URL = process.env.CRON_REGISTRY_URL || "http://localhost:7861"; 
const CRON_SECRET = process.env.CRON_SECRET || "default_secret";

const SMART_MODEL_ID = "claude"; 
const FAST_MODEL_ID = "gpt-5-mini"; 

// The Utility Server that handles the Email Dispatching
const UTILITY_SERVER_URL = process.env.UTILITY_SERVER_URL || "https://lu5zfciin5mk34fowavmhz7dt40pkhhg.lambda-url.us-east-1.on.aws";

if (!SUPABASE_URL || !SUPABASE_KEY) process.exit(1);

const app = express();
const supabase = createClient(SUPABASE_URL, SUPABASE_KEY);

app.use(express.json({ limit: '50mb' }));
app.use(cors());

let prompts = {}; 
try {
    prompts = JSON.parse(fs.readFileSync(path.resolve('./prompts.json'), 'utf8'));
} catch (e) { process.exit(1); }

const activeProjects = new Map();

const StateManager = {
    getHistory: async (projectId) => {
        if (activeProjects.has(projectId)) return activeProjects.get(projectId).history;
        const { data: chunks } = await supabase.from('message_chunks').select('*').eq('project_id', projectId).order('chunk_index', { ascending: false }).limit(10);
        const fullHistory = (chunks || []).reverse().flatMap(c => c.payload || []);
        activeProjects.set(projectId, { history: fullHistory, isFrozen: false });
        return fullHistory;
    },
    addHistory: async (projectId, role, text) => {
        const newMessage = { role, parts: [{ text }] };
        if (activeProjects.has(projectId)) activeProjects.get(projectId).history.push(newMessage);
        try {
            const { data: latestChunk } = await supabase.from('message_chunks').select('id, chunk_index, payload').eq('project_id', projectId).order('chunk_index', { ascending: false }).limit(1).single();
            const currentPayload = (latestChunk?.payload) || [];
            if (latestChunk && currentPayload.length < 20) {
                await supabase.from('message_chunks').update({ payload: [...currentPayload, newMessage] }).eq('id', latestChunk.id);
            } else {
                await supabase.from('message_chunks').insert({ project_id: projectId, lead_id: projectId, chunk_index: (latestChunk?.chunk_index ?? -1) + 1, payload: [newMessage] });
            }
        } catch (e) {}
    },
    setFrozen: async (projectId, status) => {
        if (activeProjects.has(projectId)) activeProjects.get(projectId).isFrozen = status;
        await supabase.from('leads').update({ is_frozen: status }).eq('id', projectId);
    },
    isFrozen: async (projectId) => {
        if (activeProjects.has(projectId)) return activeProjects.get(projectId).isFrozen;
        const { data } = await supabase.from('leads').select('is_frozen').eq('id', projectId).single();
        return data?.is_frozen || false;
    }
};

const callAI = async (history, input, contextData, images, systemPrompt, projectContext, modelId) => {
    let contextStr = "";
    try { contextStr = JSON.stringify(contextData, null, 2); } catch {}
    const recentHistory = history.slice(-10).map(m => `${m.role === 'model' ? 'Assistant' : 'User'}: ${m.parts?.[0]?.text || ""}`).join('\n');
    const fullPrompt = `System: ${systemPrompt}\n\n${projectContext}\n\n[HISTORY]:\n${recentHistory}\n\n[CONTEXT]: ${contextStr}\n\nUser: ${input}\nAssistant:`;

    try {
        const response = await fetch(`${REMOTE_SERVER_URL}/api/generate`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ model: modelId, prompt: fullPrompt, system_prompt: systemPrompt, images: images || [] })
        });
        const result = await response.json();
        return { text: result.data || result.text || "", usage: result.usage };
    } catch (e) { return { text: "<notification>AI Unreachable</notification>", usage: {} }; }
};

function extractCommands(text) {
    const commands = [];
    const parse = (regex, type, isJson = true) => {
        let match;
        regex.lastIndex = 0;
        while ((match = regex.exec(text)) !== null) {
            let rawPayload = match[1].trim();
            try {
                commands.push({ type, payload: isJson ? JSON.parse(rawPayload) : rawPayload });
            } catch (e) { 
                if (type === 'create_thrust') commands.push({ type, payload: { title: "System Thrust", markdown_content: rawPayload, tasks: [] } });
            }
        }
    };

    parse(/<thrust_create>([\s\S]*?)<\/thrust_create>/gi, 'create_thrust');
    parse(/<timeline_log>([\s\S]*?)<\/timeline_log>/gi, 'log_timeline');
    parse(/<notification>([\s\S]*?)<\/notification>/gi, 'notification', false);
    parse(/<update_requirements>([\s\S]*?)<\/update_requirements>/gi, 'update_requirements', false);
    parse(/<schedule_briefing>([\s\S]*?)<\/schedule_briefing>/gi, 'schedule_briefing');
    parse(/<freeze_project>([\s\S]*?)<\/freeze_project>/gi, 'freeze_project', false); 
    parse(/<thrust_complete>([\s\S]*?)<\/thrust_complete>/gi, 'thrust_complete', false); 
    parse(/<complete_task>([\s\S]*?)<\/complete_task>/gi, 'complete_task', false); 

    return commands;
}

// --- BULLETPROOF CRON MATH ---
async function registerMorningCron(projectId, offset) {
    const now = new Date();
    const target = new Date(now);
    
    const targetUtcMinutes = (5 * 60) - (offset * 60); 
    target.setUTCHours(0, targetUtcMinutes, 0, 0); 
    
    if (target <= now) target.setDate(target.getDate() + 1); 

    const delayMs = target.getTime() - now.getTime();
    console.log(`⏰ Briefing Scheduled for ${projectId}. Local 6AM occurs in ${(delayMs/1000/60/60).toFixed(2)} hours.`);

    fetch(`${CRON_REGISTRY_URL}/register`, {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ 
            secret: CRON_SECRET, 
            jobId: `briefing_${projectId}`, 
            intervalMs: 86400000, 
            initialDelay: delayMs, 
            webhookUrl: `https://everydaytok-thrust-core-server.hf.space/automated-briefing`, 
            leadId: projectId, 
            payload: { projectId, timezoneOffset: offset } 
        })
    }).catch(()=>{});
}

// --- EMAIL DISPATCHER HELPER ---
async function dispatchEmail(userId, projectId, projectName, briefingId, markdownContent) {
    console.log(`📧 Dispatching email to Utility Server for Project: ${projectName}`);
    fetch(`${UTILITY_SERVER_URL}/api/email/send-briefing`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ userId, projectId, projectName, briefingId, markdownContent })
    }).catch(e => console.error("Email Dispatch Error:", e.message));
}

async function executeCommands(userId, projectId, commands) {
    // TRACK THE NEW THRUST SO WE CAN EMAIL IT LATER
    let flags = { shouldReload: false, thrustComplete: false, newThrustId: null, newThrustMarkdown: null };

    for (const cmd of commands) {
        try {
            if (cmd.type === 'create_thrust') {
                // Wipe old thrust
                await supabase.from('thrusts').delete().eq('lead_id', projectId);

                const { data: thrust } = await supabase.from('thrusts').insert({ lead_id: projectId, title: cmd.payload.title, markdown_content: cmd.payload.markdown_content, status: 'active' }).select().single();
                if (thrust && cmd.payload.tasks && cmd.payload.tasks.length > 0) {
                    const tasks = cmd.payload.tasks.map(t => ({ thrust_id: thrust.id, title: t }));
                    await supabase.from('thrust_tasks').insert(tasks);
                }
                
                flags.shouldReload = true;

                // Capture data for email dispatch
                if (thrust) {
                    flags.newThrustId = thrust.id;
                    flags.newThrustMarkdown = cmd.payload.markdown_content;
                }
            }

            if (cmd.type === 'log_timeline') {
                await supabase.from('timeline_events').insert({ lead_id: projectId, title: cmd.payload.title, description: cmd.payload.description, type: (cmd.payload.type || 'system').toLowerCase() });
                flags.shouldReload = true;
            }

            if (cmd.type === 'update_requirements') {
                await supabase.from('leads').update({ requirements_doc: cmd.payload }).eq('id', projectId);
                flags.shouldReload = true;
            }

            if (cmd.type === 'schedule_briefing') {
                await registerMorningCron(projectId, cmd.payload.timezone_offset || 0);
            }

            if (cmd.type === 'complete_task') {
                const { data: active } = await supabase.from('thrusts').select('id').eq('lead_id', projectId).eq('status', 'active').single();
                if (active) {
                    await supabase.from('thrust_tasks').update({ status: 'done' }).eq('thrust_id', active.id).ilike('title', `%${cmd.payload}%`);
                    flags.shouldReload = true;
                }
            }

            if (cmd.type === 'thrust_complete') {
                const { data: active } = await supabase.from('thrusts').select('id').eq('lead_id', projectId).eq('status', 'active').single();
                if (active) {
                    await supabase.from('thrusts').update({ status: 'completed' }).eq('id', active.id);
                    await supabase.from('thrust_tasks').delete().eq('thrust_id', active.id);
                    flags.thrustComplete = true;
                }
            }

            if (cmd.type === 'freeze_project') {
                const isFrozen = cmd.payload === 'true';
                await StateManager.setFrozen(projectId, isFrozen);
            }

            if (cmd.type === 'notification' && FRONT_URL) {
                fetch(`${FRONT_URL}/internal/notify`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ user_id: userId, type: 'toast', message: cmd.payload }) }).catch(() => {});
            }

        } catch (e) {}
    }
    return flags;
}

app.post('/init-project', async (req, res) => {
    // Note: timezoneOffset added here to capture frontend's data
    const { userId, name, description, localPath, timezoneOffset = 0 } = req.body;
    const { data: lead } = await supabase.from('leads').insert({ user_id: userId, name, description, local_path: localPath, status: 'active', requirements_doc: "Init..." }).select().single();
    res.json({ success: true, leadId: lead.id });

    setImmediate(async () => {
        try {
            const initInput = `PROJECT: ${name}\nDESC: ${description}\nUSER TIMEZONE OFFSET: ${timezoneOffset}\nTask: Init PRD, First Thrust, Schedule Morning Briefing.`;
            const aiResult = await callAI([], initInput, {}, [], prompts.init_system_prompt, "", SMART_MODEL_ID);
            aiResult.text += `\n<notification>Project '${name}' initialized successfully!</notification>`;
            await StateManager.addHistory(lead.id, 'user', initInput);
            await StateManager.addHistory(lead.id, 'model', aiResult.text);
            const cmds = extractCommands(aiResult.text);
            await executeCommands(userId, lead.id, cmds);
            
            // NO EMAIL DISPATCH HERE - strictly for morning briefings!
        } catch (err) {}
    });
});

app.post('/process', async (req, res) => {
    const { userId, projectId, prompt, context, images, task_type = 'chat' } = req.body;
    if (task_type === 'chat') await StateManager.setFrozen(projectId, false);

    let selectedModel = (task_type === 'log_ingestion') ? FAST_MODEL_ID : SMART_MODEL_ID;
    let sysPrompt = (task_type === 'log_ingestion') ? prompts.log_analyst_prompt : prompts.director_system_prompt;

    try {
        const { data: lead } = await supabase.from('leads').select('requirements_doc').eq('id', projectId).single();
        const { data: activeThrust } = await supabase.from('thrusts').select('title, tasks:thrust_tasks(title, status)').eq('lead_id', projectId).eq('status', 'active').order('created_at', { ascending: false }).limit(1).single();
        const { data: timeline } = await supabase.from('timeline_events').select('title, type, description, created_at').eq('lead_id', projectId).order('created_at', { ascending: false }).limit(10); 

        const projectContext = `[PRD]: ${lead?.requirements_doc?.substring(0, 3000)}...\n[CURRENT THRUST]: ${activeThrust ? JSON.stringify(activeThrust) : "None"}\n[RECENT TIMELINE]: ${JSON.stringify(timeline || [])}`;
        const history = await StateManager.getHistory(projectId);
        
        let aiResult = await callAI(history, prompt, context, images, sysPrompt, projectContext, selectedModel);
        let cmds = extractCommands(aiResult.text);
        let flags = await executeCommands(userId, projectId, cmds);

        if (flags.thrustComplete && task_type === 'log_ingestion') {
            const escalationPrompt = "The previous thrust is complete based on logs. Generate the next Thrust immediately to keep momentum.";
            const smartResult = await callAI(history, escalationPrompt, context, [], prompts.director_system_prompt, projectContext, SMART_MODEL_ID);
            aiResult.text += `\n\n[DIRECTOR INTERVENTION]:\n${smartResult.text}`;
            const smartCmds = extractCommands(smartResult.text);
            await executeCommands(userId, projectId, smartCmds);
            
            // NO EMAIL DISPATCH HERE - strictly for morning briefings!

            await StateManager.addHistory(projectId, 'model', aiResult.text);
        } else {
            await StateManager.addHistory(projectId, 'model', aiResult.text);
        }

        const cleanText = aiResult.text.replace(/<[^>]+>[\s\S]*?<\/[^>]+>/g, '').trim();
        res.json({ text: cleanText, should_reload: flags.shouldReload });
    } catch (e) { res.status(500).json({ error: "Processing Error" }); }
});

app.post('/automated-briefing', async (req, res) => {
    const { projectId } = req.body;

    try {
        const isFrozen = await StateManager.isFrozen(projectId);
        const { data: lastThrust } = await supabase.from('thrusts').select('created_at').eq('lead_id', projectId).order('created_at', { ascending: false }).limit(1).single();

        const lastThrustDate = lastThrust ? new Date(lastThrust.created_at).getDate() : 0;
        const today = new Date();
        const todayDate = today.getDate();

        if (isFrozen) return res.json({ status: "skipped_frozen" });
        if (lastThrustDate === todayDate) return res.json({ status: "skipped_exists" });

        const currentDateString = today.toLocaleDateString('en-US', { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' });
        
        const prompt = `[SYSTEM TIME: ${currentDateString} at 5:00 AM]\nIt is morning. Generate today's Morning Briefing (New Thrust). Look at the RECENT TIMELINE to see what was accomplished yesterday. Adopt a highly conversational, proactive tone in the markdown (e.g., 'Morning! You finished X yesterday. Today, the priority is Y.'). If the project has been idle for days, use <freeze_project>true</freeze_project>.`;
        
        const { data: lead } = await supabase.from('leads').select('*').eq('id', projectId).single();
        const { data: timeline } = await supabase.from('timeline_events').select('*').eq('lead_id', projectId).order('created_at', { ascending: false }).limit(5);

        const projectContext = `[PRD]: ${lead.requirements_doc}\n[RECENT TIMELINE]: ${JSON.stringify(timeline)}`;
        const history = await StateManager.getHistory(projectId);
        
        const aiResult = await callAI(history, prompt, {}, [], prompts.director_system_prompt, projectContext, SMART_MODEL_ID);
        
        await StateManager.addHistory(projectId, 'model', aiResult.text);
        const cmds = extractCommands(aiResult.text);
        const flags = await executeCommands(lead.user_id, projectId, cmds);

        // 👉 EMAIL IS DISPATCHED ONLY HERE
        if (flags.newThrustId) {
            await dispatchEmail(lead.user_id, projectId, lead.name, flags.newThrustId, flags.newThrustMarkdown);
        }

        await StateManager.setFrozen(projectId, true); 
        res.json({ success: true });

    } catch (e) { res.status(500).json({ error: e.message }); }
});

app.get('/', async (req, res) => res.status(200).json({ status: "Alive" }));
app.listen(PORT, () => console.log(`✅ Core Online: ${PORT}`));