const db = require('../config/db');

const getDniFromLocation = (locationData) => {
    if (locationData?.extras?.alias) {
        return String(locationData.extras.alias);
    }

    if (locationData?.alias) {
        return String(locationData.alias);
    }

    return null;
};

const getCoordinatesFromLocation = (locationData) => {
    if (locationData?.location?.coords) {
        return {
            lat: locationData.location.coords.latitude,
            lng: locationData.location.coords.longitude
        };
    }

    if (locationData?.coords) {
        return {
            lat: locationData.coords.latitude,
            lng: locationData.coords.longitude
        };
    }

    if (
        Object.prototype.hasOwnProperty.call(locationData || {}, 'latitude') &&
        Object.prototype.hasOwnProperty.call(locationData || {}, 'longitude')
    ) {
        return {
            lat: locationData.latitude,
            lng: locationData.longitude
        };
    }

    return null;
};

const normalizeTripId = (rawValue) => {
    if (rawValue === undefined || rawValue === null || String(rawValue).trim() === '') {
        return null;
    }

    const parsed = Number.parseInt(String(rawValue).trim(), 10);
    return Number.isInteger(parsed) && parsed > 0 ? parsed : null;
};

const getTripIdFromLocation = (locationData) => {
    const candidates = [
        locationData?.id_viaje,
        locationData?.tripId,
        locationData?.idViaje,
        locationData?.params?.id_viaje,
        locationData?.params?.tripId,
        locationData?.extras?.id_viaje,
        locationData?.extras?.tripId
    ];

    for (const value of candidates) {
        const normalized = normalizeTripId(value);
        if (normalized !== null) {
            return normalized;
        }
    }

    return null;
};

const saveLocation = async (req, res) => {
    try {
        const data = req.body;
        console.log('Location payload received:', JSON.stringify(data, null, 2));

        let locations = [];
        let globalDni = null;
        let globalTripId = null;

        if (req.user?.dni) {
            globalDni = String(req.user.dni);
        }

        if (Array.isArray(data)) {
            locations = data;
        } else if (data?.location && Array.isArray(data.location)) {
            locations = data.location;
            if (!globalDni) {
                if (data.alias) {
                    globalDni = String(data.alias);
                } else if (data.params?.alias) {
                    globalDni = String(data.params.alias);
                }
            }
            globalTripId = getTripIdFromLocation(data);
        } else {
            locations = [data];
            globalTripId = getTripIdFromLocation(data);
        }

        const now = new Date();
        const rowsToInsert = [];

        for (const loc of locations) {
            const coords = getCoordinatesFromLocation(loc);
            const dni = globalDni || getDniFromLocation(loc);
            const tripId = globalTripId !== null ? globalTripId : getTripIdFromLocation(loc);

            if (coords && coords.lat !== undefined && coords.lat !== null && coords.lng !== undefined && coords.lng !== null) {
                rowsToInsert.push([
                    String(coords.lat),
                    String(coords.lng),
                    dni || null,
                    now,
                    tripId
                ]);
            }
        }

        if (rowsToInsert.length === 0) {
            return res.json({
                success: false,
                error: 'no_coords',
                message: 'No valid coordinates found in batch/object'
            });
        }

        await db.query(
            `INSERT INTO c_trazabilidad_transportista
                (latitud, longitud, id_usuario, fecha, id_viaje)
            VALUES ?`,
            [rowsToInsert]
        );

        return res.json({
            success: true,
            count: rowsToInsert.length,
            message: 'Locations saved'
        });
    } catch (error) {
        console.error('Error saving location:', error);
        return res.status(500).json({ success: false, error: error.message });
    }
};

module.exports = {
    saveLocation
};