server.js

require('dotenv').config()
const express = require('express')
const cors = require('cors')
const path = require('path')
const db = require('./db')
const context = require('./context')
const ai = require('./ai')
const fs = require('fs')

const app = express()
const PORT = process.env.PORT || 3000
const DB_PATH = process.env.DB_PATH || './nature_republic.db'
const CS_CONTACT = 'cs@naturerepublic.id or www.naturerepublic.id'

if (!process.env.DEEPSEEK_API_KEY || process.env.DEEPSEEK_API_KEY === 'your_deepseek_api_key_here') {
    console.error('ERROR: DEEPSEEK_API_KEY is not set in .env')
    process.exit(1)
}

if (!fs.existsSync(path.resolve(DB_PATH))) {
    console.error(`ERROR: Database file not found at ${DB_PATH}`)
    console.error('Please place your nature_republic.db file in the project root.')
    process.exit(1)
}

app.use(cors())
app.use(express.json())
app.use(express.static(path.join(__dirname, 'public')))

db.init(DB_PATH)
ai.init({
    apiKey: process.env.DEEPSEEK_API_KEY,
    baseURL: process.env.DEEPSEEK_BASE_URL,
    model: process.env.DEEPSEEK_MODEL,
})

app.post('/api/chat', async (req, res) => {
    try {
        const { message } = req.body
        if (!message || !message.trim()) {
            return res.status(400).json({ error: 'Message is required' })
        }

        const ctx = context.buildContext(message)
        const reply = await ai.getReply(message, ctx, CS_CONTACT)

        res.json({ reply, hasData: !!ctx })
    } catch (err) {
        console.error('Chat error:', err)
        res.status(500).json({ error: 'Internal server error' })
    }
})

app.listen(PORT, () => {
    console.log(`CS Chatbot running at http://localhost:${PORT}`)
})