const fs = require('fs')
const db = require("../models")

const Airport = db['Airport']
const Flight = db['Flight']

db.sequelize.sync().then(() => (async () => {
    // Refresh airport data
    let airportData = await fs.promises.readFile(`${__dirname}/../data/airports.json`, 'utf-8')
    airportData = JSON.parse(airportData)

    let icao_codes = []
    let iata_codes = []
    let results = await Airport.findAll({attributes: ['icao_code', 'iata_code']})
    for (let result of results) {
        if (result.icao_code)
            icao_codes.push(result.icao_code)
        if (result.iata_code)
            iata_codes.push(result.iata_code)
    }
    // Import all not-imported airports
    await Airport.bulkCreate(airportData['response'].filter(airport => !icao_codes.includes(airport.icao_code)
        && !iata_codes.includes(airport.iata_code)))

    // Import flight routes per departure
    let airports = await Airport.findAll({attributes: ['icao_code']})
    for (let airport of airports) {
        const airportRoutesFile = `${__dirname}/../data/routes/${airport.icao_code}.json`
        // Ignore unexisting files
        if (!(await fs.promises.stat(airportRoutesFile).catch(() => false)))
            continue

        // Read routes
        let flightsData = await fs.promises.readFile(airportRoutesFile, 'utf-8')
        flightsData = JSON.parse(flightsData)

        // First remove old routes
        await Flight.destroy({where: {dep_icao: airport.icao_code}})

        // Then import new routes
        await Flight.bulkCreate(flightsData['response'])
    }
})())