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import { browser, dev } from "$app/environment";
import { StorageKeys } from "$lib/configuration";
import pino from "pino";

const pinoConfig = dev ? {
    transport: {
        target: "pino-pretty",
    }
} : {};

const pinoLogger = pino(pinoConfig);

function browserLogLevel(): number {
    if (browser) return LogLevel.toNumber(sessionStorage.getItem(StorageKeys.logLevel), LogLevel.INFO);
    throw new Error("Called browser api in server");
}

function serverLogLevel(): number {
    if (!browser) return LogLevel.toNumber(import.meta.env.VITE_LOG_LEVEL, LogLevel.ERROR);
    throw new Error("Called server api in browser");
}

export const LogLevel = {
    DEBUG: 0,
    INFO: 1,
    ERROR: 2,
    SILENT: 3,
    toString(levelInt: number): string {
        switch (levelInt) {
            case 0:
                return "DEBUG";
            case 1:
                return "INFO";
            case 2:
                return "ERROR";
            case 3:
                return "SILENT";
            default:
                throw new Error("Log level int is unknown");
        }
    },
    toNumber(levelString?: string | null, fallback?: number): number {
        if (!levelString && fallback) return fallback;
        else if (!levelString && !fallback) throw new Error("levelString was empty, and no fallback was specified");
        switch (levelString?.toUpperCase()) {
            case "DEBUG":
                return 0;
            case "INFO":
                return 1;
            case "ERROR":
                return 2;
            case "SILENT":
                return 3;
            default:
                if (!fallback) throw new Error("Log level string is unknown");
                else return fallback;
        }
    },
};

export function logDebug(message: string, ...additional: any[]): void {
    if (browser && browserLogLevel() <= LogLevel.DEBUG) {
        pinoLogger.debug(message, additional);
    }
    if (!browser && serverLogLevel() <= LogLevel.DEBUG) {
        pinoLogger.debug(message, additional);
    }
}

export function logInfo(message: string, ...additional: any[]): void {
    if (browser && browserLogLevel() <= LogLevel.INFO) {
        pinoLogger.info(message, additional);
    }
    if (!browser && serverLogLevel() <= LogLevel.INFO) {
        pinoLogger.info(message, additional);
    }
}

export function logError(message: any, ...additional: any[]): void {
    if (browser && browserLogLevel() <= LogLevel.ERROR) {
        pinoLogger.error(message, additional);
    }
    if (!browser && serverLogLevel() <= LogLevel.ERROR) {
        pinoLogger.error(message, additional);
    }
}