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

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

const pinoLogger = pino(pinoConfig);

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

function server_log_level(): number {
    if (!browser) return LogLevel.to_number(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,
    to_string(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");
        }
    },
    to_number(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 log_debug(message: string, ...additional: any[]): void {
    if (browser && browser_log_level() <= LogLevel.DEBUG) {
        pinoLogger.debug(message, additional);
    }
    if (!browser && server_log_level() <= LogLevel.DEBUG) {
        pinoLogger.debug(message, additional);
    }
}

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

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