const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');
const { Client, Databases, ID } = require('node-appwrite');
require('dotenv').config({ path: '.env.local' });
const mammoth = require('mammoth');

const client = new Client()
    .setEndpoint(process.env.NEXT_PUBLIC_APPWRITE_ENDPOINT)
    .setProject(process.env.NEXT_PUBLIC_APPWRITE_PROJECT_ID)
    .setKey(process.env.APPWRITE_API_KEY);

const databases = new Databases(client);
const dbId = process.env.APPWRITE_DATABASE_ID;
const collectionId = 'posts';
const defaultTipoPublicacionId = '69c2b91400362d5d52b6'; // NOTICIA

const DIR_PENDIENTES = '/home/carlos/Documentos/Pendientes';

function generateSlug(titulo) {
    return titulo.toLowerCase().normalize('NFD').replace(/[\u0300-\u036f]/g, '').replace(/[^a-z0-9\s-]/g, '').trim().replace(/\s+/g, '-').replace(/-+/g, '-').substring(0, 100);
}

function truncateString(str, length) {
    if (!str) return '';
    return str.length > length ? str.substring(0, length - 3) + '...' : str;
}

function extractDate(filename) {
    const regex = /(\d{1,2})\s+DE\s+([A-Z]+)\s+DEL?\s+(\d{4})/i;
    const match = filename.match(regex);
    if (match) {
        const months = { 'enero': 0, 'febrero': 1, 'marzo': 2, 'abril': 3, 'mayo': 4, 'junio': 5, 'julio': 6, 'agosto': 7, 'septiembre': 8, 'octubre': 9, 'noviembre': 10, 'diciembre': 11 };
        const monthStr = match[2].toLowerCase();
        if (months[monthStr] !== undefined) {
            return new Date(parseInt(match[3], 10), months[monthStr], parseInt(match[1], 10), 12, 0, 0).toISOString();
        }
    }
    return new Date().toISOString();
}

function extractDriveUrl(text) {
    const match = text.match(/https:\/\/drive\.google\.com\/[^\s\n]+/);
    return match ? match[0] : null;
}

async function insertPost(title, contentBlocks, driveUrl, filename) {
    if (!title || contentBlocks.length === 0) return;
    
    let pureContent = contentBlocks.filter(b => !b.includes('http')).map(p => `<p>${p}</p>`).join('');
    
    const docData = {
        titulo: truncateString(title, 70),
        slug: generateSlug(title) + '-' + Math.random().toString(36).substring(2, 7),
        contenido: pureContent,
        resumen_redes: truncateString(contentBlocks[0], 155),
        seo_titulo: truncateString(title, 60),
        seo_descripcion: truncateString(contentBlocks[0], 155),
        estado: 'borrador',
        tipo_publicacion_id: defaultTipoPublicacionId,
        fecha_publicacion: extractDate(filename),
        ...(driveUrl && { url_destino: driveUrl })
    };

    try {
        await databases.createDocument(dbId, collectionId, ID.unique(), docData);
        console.log(`✅ Creado: ${docData.titulo}`);
    } catch (e) {
        console.error(`❌ Error en ${title}:`, e.message);
    }
}

async function processFile(filePath, filename) {
    const ext = path.extname(filename).toLowerCase();
    
    if (ext === '.docx') {
        const result = await mammoth.extractRawText({ path: filePath });
        const lines = result.value.split('\n').map(l => l.trim()).filter(l => l.length > 0);
        if (lines.length > 0) {
            const title = lines[0];
            const contentBlocks = lines.slice(1);
            const driveUrl = extractDriveUrl(result.value);
            await insertPost(title, contentBlocks, driveUrl, filename);
        }
    } else if (ext === '.pdf') {
        const text = execSync(`pdftotext "${filePath}" -`).toString();
        const pages = text.split('\x0C').map(p => p.trim()).filter(p => p.length > 0);
        
        for (const page of pages) {
            const lines = page.split('\n').map(l => l.trim()).filter(l => l.length > 0);
            if (lines.length < 3) continue;

            let startIndex = 0;
            if (lines[0].toLowerCase().includes('boletín')) {
                startIndex = 1; // skip header
            }
            
            const title = lines[startIndex];
            const contentBlocks = [];
            let currentBlock = [];
            for (let i = startIndex + 1; i < lines.length; i++) {
                currentBlock.push(lines[i]);
                if (lines[i].endsWith('.') || lines[i].includes('http')) {
                    contentBlocks.push(currentBlock.join(' '));
                    currentBlock = [];
                }
            }
            if (currentBlock.length > 0) contentBlocks.push(currentBlock.join(' '));
            
            const driveUrl = extractDriveUrl(page);
            await insertPost(title, contentBlocks, driveUrl, filename);
        }
    }
}

async function main() {
    let files = fs.readdirSync(DIR_PENDIENTES).filter(f => f.endsWith('.pdf') || f.endsWith('.docx'));
    
    files.sort((a, b) => {
        const numA = parseInt(a.match(/\d+/)) || 0;
        const numB = parseInt(b.match(/\d+/)) || 0;
        return numA - numB;
    });

    // Only March and April: Boletines 22 to 37
    files = files.filter(f => {
        const num = parseInt(f.match(/\d+/)) || 0;
        return num >= 22 && num <= 37;
    });

    console.log(`Procesando ${files.length} archivos de Marzo y Abril...`);

    for (const file of files) {
        console.log(`\n📄 Iniciando: ${file}`);
        await processFile(path.join(DIR_PENDIENTES, file), file);
    }
    console.log('\n¡Proceso finalizado!');
}

main();