const express = require('express');
const { spawn } = require('child_process');
const bodyParser = require('body-parser');
const cors = require('cors');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = 3001; 

// Middleware
app.use(cors()); 
app.use(bodyParser.json()); 

// Helper für Python-Aufrufe, um Code-Duplizierung zu vermeiden
const runPython = (args, res, tempFilesToDelete = []) => {
    // Im Docker (python:3.11-slim Image) nutzen wir das globale python3
    const pythonExecutable = 'python3';
    
    console.log(`Spawning command: ${pythonExecutable} ${args.join(' ')}`);

    const pythonProcess = spawn(pythonExecutable, args);

    let pythonOutput = '';
    let pythonError = '';

    pythonProcess.stdout.on('data', (data) => {
        pythonOutput += data.toString();
    });

    pythonProcess.stderr.on('data', (data) => {
        pythonError += data.toString();
    });

    pythonProcess.on('close', (code) => {
        console.log(`Python script finished with exit code: ${code}`);
        if (pythonOutput.length > 500) {
             console.log(`--- STDOUT (Truncated) ---`);
             console.log(pythonOutput.substring(0, 500) + '...');
        } else {
             console.log(`--- STDOUT ---`);
             console.log(pythonOutput);
        }
        
        if (pythonError) {
             console.log(`--- STDERR ---`);
             console.log(pythonError);
        }
        console.log(`----------------`);

        // Aufräumen
        tempFilesToDelete.forEach(file => {
            if (fs.existsSync(file)) {
                try {
                    fs.unlinkSync(file);
                } catch (e) {
                    console.error(`Failed to delete temp file ${file}:`, e.message);
                }
            }
        });

        if (code !== 0) {
            console.error(`Python script exited with error.`);
            return res.status(500).json({ error: 'Python script failed', details: pythonError });
        }

        try {
            const result = JSON.parse(pythonOutput);
            res.json(result);
        } catch (parseError) {
            console.error('Failed to parse Python output as JSON:', parseError);
            res.status(500).json({ error: 'Invalid JSON from Python script', rawOutput: pythonOutput, details: pythonError });
        }
    });

    pythonProcess.on('error', (err) => {
        console.error('FATAL: Failed to start python process itself.', err);
        tempFilesToDelete.forEach(file => {
            if (fs.existsSync(file)) fs.unlinkSync(file);
        });
        res.status(500).json({ error: 'Failed to start Python process', details: err.message });
    });
};


// API-Endpunkt für generateSearchStrategy
app.post('/api/generate-search-strategy', async (req, res) => {
    console.log(`[${new Date().toISOString()}] HIT: /api/generate-search-strategy`);
    const { referenceUrl, contextContent } = req.body;

    if (!referenceUrl || !contextContent) {
        return res.status(400).json({ error: 'Missing referenceUrl or contextContent' });
    }

    const tmpDir = path.join(__dirname, 'tmp');
    if (!fs.existsSync(tmpDir)) fs.mkdirSync(tmpDir);
    const tempContextFilePath = path.join(tmpDir, `context_${Date.now()}.md`);

    try {
        fs.writeFileSync(tempContextFilePath, contextContent);
        
        const pythonScript = path.join(__dirname, '..', 'market_intel_orchestrator.py');
        const scriptArgs = [pythonScript, '--mode', 'generate_strategy', '--reference_url', referenceUrl, '--context_file', tempContextFilePath];
        
        runPython(scriptArgs, res, [tempContextFilePath]);

    } catch (writeError) {
        console.error('Failed to write temporary context file:', writeError);
        res.status(500).json({ error: 'Failed to write temporary file', details: writeError.message });
    }
});

// API-Endpunkt für identifyCompetitors
app.post('/api/identify-competitors', async (req, res) => {
    console.log(`[${new Date().toISOString()}] HIT: /api/identify-competitors`);
    const { referenceUrl, targetMarket, contextContent, referenceCity, referenceCountry, summaryOfOffer } = req.body;

    if (!referenceUrl || !targetMarket) {
        return res.status(400).json({ error: 'Missing referenceUrl or targetMarket' });
    }

    const tmpDir = path.join(__dirname, 'tmp');
    if (!fs.existsSync(tmpDir)) fs.mkdirSync(tmpDir);
    const tempContextFilePath = path.join(tmpDir, `context_comp_${Date.now()}.md`);

    try {
        const cleanupFiles = [];
        if (contextContent) {
            fs.writeFileSync(tempContextFilePath, contextContent);
            cleanupFiles.push(tempContextFilePath);
        }

        const pythonScript = path.join(__dirname, '..', 'market_intel_orchestrator.py');
        const scriptArgs = [
            pythonScript,
            '--mode', 'identify_competitors',
            '--reference_url', referenceUrl,
            '--target_market', targetMarket
        ];

        if (contextContent) scriptArgs.push('--context_file', tempContextFilePath);
        if (referenceCity) scriptArgs.push('--reference_city', referenceCity);
        if (referenceCountry) scriptArgs.push('--reference_country', referenceCountry);
        if (summaryOfOffer) scriptArgs.push('--summary_of_offer', summaryOfOffer);
        
        runPython(scriptArgs, res, cleanupFiles);

    } catch (writeError) {
        res.status(500).json({ error: 'Failed to write temporary file', details: writeError.message });
    }
});

// API-Endpunkt für analyze-company (Deep Tech Audit)
app.post('/api/analyze-company', async (req, res) => {
    console.log(`[${new Date().toISOString()}] HIT: /api/analyze-company`);
    const { companyName, strategy, targetMarket } = req.body;

    if (!companyName || !strategy) {
        return res.status(400).json({ error: 'Missing companyName or strategy' });
    }

    const pythonScript = path.join(__dirname, '..', 'market_intel_orchestrator.py');
    const scriptArgs = [
        pythonScript,
        '--mode', 'analyze_company',
        '--company_name', companyName,
        '--strategy_json', JSON.stringify(strategy),
        '--target_market', targetMarket || 'Germany'
    ];

    runPython(scriptArgs, res);
});

// API-Endpunkt für generate-outreach
app.post('/api/generate-outreach', async (req, res) => {
    console.log(`[${new Date().toISOString()}] HIT: /api/generate-outreach`);
    const { companyData, knowledgeBase, referenceUrl } = req.body;

    if (!companyData || !knowledgeBase) {
        return res.status(400).json({ error: 'Missing companyData or knowledgeBase' });
    }

    const tmpDir = path.join(__dirname, 'tmp');
    if (!fs.existsSync(tmpDir)) fs.mkdirSync(tmpDir);
    const tempDataFilePath = path.join(tmpDir, `outreach_data_${Date.now()}.json`);
    const tempContextFilePath = path.join(tmpDir, `outreach_context_${Date.now()}.md`);

    try {
        fs.writeFileSync(tempDataFilePath, JSON.stringify(companyData));
        fs.writeFileSync(tempContextFilePath, knowledgeBase);

        const pythonScript = path.join(__dirname, '..', 'market_intel_orchestrator.py');
        const scriptArgs = [
            pythonScript,
            '--mode', 'generate_outreach',
            '--company_data_file', tempDataFilePath,
            '--context_file', tempContextFilePath,
            '--reference_url', referenceUrl || ''
        ];

        runPython(scriptArgs, res, [tempDataFilePath, tempContextFilePath]);

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

app.listen(PORT, () => {
    console.log(`Node.js API Bridge running on http://localhost:${PORT}`);
});