const fs = require("fs");
const path = require("path");
const { applyEnvOverrides } = require("../config");
const { loadEnv } = require("../env");

const DEFAULT_WEATHER_CONFIG = {
    timezone: "Europe/Paris",
    defaultHour: 12,
    defaultMinute: 0,
    windowMinutes: 60,
    precipitationThreshold: 0.1,
    providers: {
        influxdb: {
            windowMinutes: 60,
        },
        openMeteo: {
            timezone: null,
            pressureOffset: 0,
            illuminanceToLuxFactor: 126.7,
        },
    },
};

function loadWeatherConfig(configPath = path.resolve(__dirname, "..", "..", "config.json")) {
    loadEnv();

    let raw = {};

    if (fs.existsSync(configPath)) {
        try {
            raw = JSON.parse(fs.readFileSync(configPath, "utf8"));
        } catch (error) {
            console.error(`Unable to read weather config at ${configPath}: ${error.message}`);
        }
    }

    const withEnv = applyEnvOverrides(raw);
    const weather = withEnv.weather || {};

    const providers = {
        ...DEFAULT_WEATHER_CONFIG.providers,
        ...(weather.providers || {}),
    };

    providers.influxdb = {
        ...DEFAULT_WEATHER_CONFIG.providers.influxdb,
        ...(weather.providers?.influxdb || {}),
    };

    providers.openMeteo = {
        ...DEFAULT_WEATHER_CONFIG.providers.openMeteo,
        timezone: weather.providers?.openMeteo?.timezone || weather.timezone || DEFAULT_WEATHER_CONFIG.timezone,
        ...(weather.providers?.openMeteo || {}),
    };

    return {
        ...DEFAULT_WEATHER_CONFIG,
        ...weather,
        providers,
    };
}

module.exports = {
    DEFAULT_WEATHER_CONFIG,
    loadWeatherConfig,
};