// Try loading .env for local development, ignore if missing (production)
try { process.loadEnvFile?.(); } catch { } // Node 20+ native support
import express from 'express';
import cors from 'cors';
import { bundle } from '@remotion/bundler';
import { renderMedia, selectComposition } from '@remotion/renderer';
import { readFile, rm } from 'fs/promises';
import { tmpdir } from 'os';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';
import os from 'os';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const app = express();
const PORT = process.env.PORT || 7860;

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

// Health check
app.get('/', (req, res) => {
    res.json({ status: 'ok', service: 'FacelessFlowAI Video Renderer (Simple)' });
});

// Render endpoint
app.post('/render', async (req, res) => {
    const { projectId, scenes, settings } = req.body;

    if (!projectId || !scenes || !settings) {
        return res.status(400).json({ error: 'Missing projectId, scenes, or settings' });
    }

    // Initialize Supabase Admin Client
    const SUPABASE_URL = process.env.SUPABASE_URL;
    const SUPABASE_SERVICE_ROLE_KEY = process.env.SUPABASE_SERVICE_ROLE_KEY;

    if (!SUPABASE_URL || !SUPABASE_SERVICE_ROLE_KEY) {
        console.error('[Config] Missing Supabase credentials');
        return res.status(500).json({ error: 'Renderer configuration error' });
    }

    const { createClient } = await import('@supabase/supabase-js');
    const supabase = createClient(SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY);

    // 1. Respond immediately
    res.json({ success: true, message: 'Rendering started in background' });

    // 2. Start Background Process
    (async () => {
        try {
            console.log(`[Render] Starting background render for project ${projectId}`);

            // Available resources
            const cpuCount = os.cpus().length;
            const freeMem = (os.freemem() / 1024 / 1024).toFixed(0);
            const totalMem = (os.totalmem() / 1024 / 1024).toFixed(0);
            console.log(`[Resources] vCPUs: ${cpuCount} | RAM: ${freeMem}/${totalMem} MB Free`);

            const bundleLocation = await bundle({
                entryPoint: join(__dirname, 'remotion', 'index.tsx'),
                webpackOverride: (config) => config,
            });

            // Clean Composition Params
            const composition = await selectComposition({
                serveUrl: bundleLocation,
                id: 'Main',
                inputProps: { scenes, settings }, // Direct Cloud URLs
                chromiumOptions: { executablePath: process.env.CHROME_BIN },
            });

            const outputLocation = join(tmpdir(), `out-${projectId}.mp4`);

            let lastLoggedPercent = -1;

            // Simple Render
            await renderMedia({
                composition,
                serveUrl: bundleLocation,
                codec: 'h264',
                pixelFormat: 'yuv420p',
                outputLocation: outputLocation,
                imageFormat: 'jpeg',
                jpegQuality: 80,
                inputProps: { scenes, settings },
                chromiumOptions: {
                    executablePath: process.env.CHROME_BIN || '/usr/bin/google-chrome-stable',
                    enableMultiProcessRendering: true, // Requested: Enable Multi-process
                    args: [
                        '--no-sandbox',
                        '--disable-dev-shm-usage',
                        '--disable-gpu',
                        '--mute-audio',
                    ]
                },
                // Use all available cores (or set specific number)
                concurrency: 1,
                disallowParallelEncoding: false,
                onProgress: ({ progress }) => {
                    const percent = Math.round(progress * 100);
                    if (percent !== lastLoggedPercent && percent % 5 === 0) {
                        console.log(`[Render] Progress: ${percent}%`);
                        lastLoggedPercent = percent;
                    }
                },
            });

            console.log(`[Render] Render complete. Uploading to Supabase...`);

            const videoBuffer = await readFile(outputLocation);

            // Upload to Supabase Storage
            const fileName = `${projectId}/video-${Date.now()}.mp4`;
            const { data: uploadData, error: uploadError } = await supabase
                .storage
                .from('projects')
                .upload(fileName, videoBuffer, {
                    contentType: 'video/mp4',
                    upsert: true
                });

            if (uploadError) throw new Error(`Upload failed: ${uploadError.message}`);

            // Get Public URL
            const { data: { publicUrl } } = supabase
                .storage
                .from('projects')
                .getPublicUrl(fileName);

            console.log(`[Render] Uploaded to ${publicUrl}`);

            // Update Project in DB
            const { error: dbError } = await supabase
                .from('projects')
                .update({
                    status: 'done',
                    video_url: publicUrl
                })
                .eq('id', projectId);

            if (dbError) throw new Error(`DB Update failed: ${dbError.message}`);

            console.log(`[Render] Project ${projectId} updated successfully`);

            // Cleanup
            await rm(outputLocation, { force: true });

        } catch (error) {
            console.error(`[Render] Background Error for ${projectId}:`, error);
            await supabase
                .from('projects')
                .update({
                    status: 'error',
                })
                .eq('id', projectId);
        }
    })();
});

app.listen(PORT, () => {
    console.log(`🎬 FacelessFlowAI Renderer running on port ${PORT}`);
    // Debug: Check for Secrets on Startup
    console.log('--- Environment Check ---');
    console.log('SUPABASE_URL exists:', !!process.env.SUPABASE_URL);
    console.log('SUPABASE_SERVICE_ROLE_KEY exists:', !!process.env.SUPABASE_SERVICE_ROLE_KEY);
});