const fs = require('fs');
const path = require('path');

const express = require('express');
const helmet = require('helmet');
const winston = require('winston');

const DocumentHandler = require('./lib/document_handler.js');
const FileStorage = require('./lib/file_storage.js');

// load configuration
let config;
try {
    config = JSON.parse(fs.readFileSync(path.join(__dirname, 'config.json'), 'utf8'));
} catch (err) {
    console.error('Error reading config.json:', err);
    process.exit(1);
}

config.port = process.env.PORT || config.port || 8080;
config.host = process.env.HOST || config.host || '0.0.0.0';

// logger-setup
const logger = winston.createLogger({
    level: 'verbose',
    format: winston.format.combine(
        winston.format.colorize(),
        winston.format.simple()
    ),
    transports: [
        new winston.transports.Console()
    ]
});

logger.info('Welcome to unknownBIN!');

// init file-storage
const fileStorage = new FileStorage({ path: config.dataPath, logger: logger });

// load static documents into file-storage
if (config.documents) {
    for (const name in config.documents) {
        const docPath = config.documents[name];
        try {
            const data = fs.readFileSync(docPath, 'utf8');
            fileStorage.set(name, data, (success) => {
                if (success) {
                    logger.verbose(`Loaded document: ${name} from ${docPath}`);
                } else {
                    logger.warn(`Failed to store document: ${name}`);
                }
            });
        } catch (err) {
            logger.warn(`Unable to find or read document: ${name} at ${docPath}`);
        }
    }
}

// configure the document handler
const documentHandler = new DocumentHandler({
    store: fileStorage,
    maxLength: config.maxLength,
    keyLength: config.keyLength,
    createKey: config.createKey,
    logger: logger
});

// setup routes and request-handling
const app = express();

// Use helmet for basic security headers
app.use(helmet());

app.get('/raw/:id', (req, res) => {
    return documentHandler.handleRawGet(req.params.id, res);
});
app.post('/documents', (req, res) => {
    return documentHandler.handlePost(req, res);
});
app.get('/documents/:id', (req, res) => {
    return documentHandler.handleGet(req.params.id, res);
});

app.use(express.static(path.join(__dirname, 'static')));

app.get('/:id', (req, res, next) => {
    res.sendFile(path.join(__dirname, '/static/index.html'));
});

app.get('/', (req, res, next) => {
    res.sendFile(path.join(__dirname, '/static/index.html'));
});


app.listen(config.port, config.host, () => {
    logger.info(`Listening on ${config.host}:${config.port}`);
});