import express, { Express } from "express"
import cors from "cors"
import path from "path"
import fs from "fs"
import { fileURLToPath } from "url"
import { dirname } from "path"
import { MetersCollection, MeterFeature } from "shared-types/meters"

// ES module equivalent of __dirname
const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)

const app: Express = express()
const PORT = process.env.PORT || 3001

// Middleware
app.use(cors())
app.use(express.json())

// Route to serve the saudi_meters.json file
app.get("/api/meters", (req, res) => {
  try {
    const filePath = path.join(__dirname, "saudi_meters.json")
    const data = fs.readFileSync(filePath, "utf8")
    const metersData: MetersCollection = JSON.parse(data)

    res.json(metersData)
  } catch (error) {
    console.error("Error reading meters data:", error)
    res.status(500).json({ error: "Failed to load meters data" })
  }
})

// Route to get individual meter by ID
app.get("/api/meters/:id", (req, res) => {
  try {
    const { id } = req.params
    const filePath = path.join(__dirname, "saudi_meters.json")
    const data = fs.readFileSync(filePath, "utf8")
    const metersData: MetersCollection = JSON.parse(data)

    const meter = metersData.features.find(
      (feature: MeterFeature) => feature.properties.id === id
    )

    if (meter) {
      res.json(meter)
    } else {
      res.status(404).json({ error: "Meter not found" })
    }
  } catch (error) {
    console.error("Error reading meters data:", error)
    res.status(500).json({ error: "Failed to load meters data" })
  }
})

// Health check endpoint
app.get("/health", (req, res) => {
  res.json({ status: "OK", timestamp: new Date().toISOString() })
})

// Basic info endpoint
app.get("/", (req, res) => {
  res.json({
    message: "Saudi Meters API Server",
    endpoints: {
      meters: "/api/meters",
      meterById: "/api/meters/:id",
      health: "/health",
    },
  })
})

// Start the server
app.listen(PORT, () => {
  console.log(`🚀 Server running on http://localhost:${PORT}`)
  console.log(`📊 Meters data available at http://localhost:${PORT}/api/meters`)
})

export default app