// file: crates/ksp-app-store-desk/frontend/ts/frontend_log.ts
// version: 1

import { invoke } from "@tauri-apps/api/core";
import type { FrontendLogPayloadDto } from "./bindings/ksp_app_store_desk/frontend_logging/FrontendLogPayloadDto.ts";

export type FrontendLogLevel = "trace" | "debug" | "info" | "warn" | "error";
export type FrontendLogTargetId = "frontend" | "main" | "splash";

type ConsoleMethod = (...items: unknown[]) => void;

const originalConsole = {
    trace: console.trace.bind(console),
    debug: console.debug.bind(console),
    log: console.log.bind(console),
    info: console.info.bind(console),
    warn: console.warn.bind(console),
    error: console.error.bind(console),
};

function stringifyItem(item: unknown): string {
    if (item instanceof Error) {
        return item.stack ?? item.message;
    }
    if (typeof item === "string") {
        return item;
    }
    try {
        const serialized = JSON.stringify(item);
        return serialized ?? String(item);
    } catch {
        return String(item);
    }
}

function formatMessage(items: unknown[]): string {
    return items.map(item => stringifyItem(item)).join(" ");
}

async function sendFrontendLog(level: FrontendLogLevel, targetId: FrontendLogTargetId, message: string): Promise<void> {
    const payload: FrontendLogPayloadDto = {
        level,
        targetId,
        message,
    };
    await invoke("emit_frontend_log", { payload });
}

function writeOriginalConsole(level: FrontendLogLevel, message: string): void {
    return level === "trace"
        ? originalConsole.trace(message)
        : level === "debug"
          ? originalConsole.debug(message)
          : level === "info"
            ? originalConsole.info(message)
            : level === "warn"
              ? originalConsole.warn(message)
              : originalConsole.error(message);
}

export async function emitFrontendLog(level: FrontendLogLevel, targetId: FrontendLogTargetId, message: string): Promise<void> {
    writeOriginalConsole(level, message);
    await sendFrontendLog(level, targetId, message);
}

export function frontendTrace(targetId: FrontendLogTargetId, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.trace(message);
    void sendFrontendLog("trace", targetId, message).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
}

export function frontendDebug(targetId: FrontendLogTargetId, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.debug(message);
    void sendFrontendLog("debug", targetId, message).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
}

export function frontendInfo(targetId: FrontendLogTargetId, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.info(message);
    void sendFrontendLog("info", targetId, message).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
}

export function frontendWarn(targetId: FrontendLogTargetId, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.warn(message);
    void sendFrontendLog("warn", targetId, message).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
}

export function frontendError(targetId: FrontendLogTargetId, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.error(message);
    void sendFrontendLog("error", targetId, message).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
}

function buildConsoleBridge(level: FrontendLogLevel, targetId: FrontendLogTargetId, original: ConsoleMethod): ConsoleMethod {
    return (...items: unknown[]) => {
        original(...items);
        void sendFrontendLog(level, targetId, formatMessage(items)).catch(caughtError => originalConsole.error("KSP frontend logging bridge failed", caughtError));
    };
}

export function installFrontendConsoleBridge(targetId: FrontendLogTargetId): void {
    console.trace = buildConsoleBridge("trace", targetId, originalConsole.trace);
    console.debug = buildConsoleBridge("debug", targetId, originalConsole.debug);
    console.log = buildConsoleBridge("info", targetId, originalConsole.log);
    console.info = buildConsoleBridge("info", targetId, originalConsole.info);
    console.warn = buildConsoleBridge("warn", targetId, originalConsole.warn);
    console.error = buildConsoleBridge("error", targetId, originalConsole.error);
}