// file: kb-app-demo-desktop/frontend/ts/frontend_log.ts
// version: 3

//! Frontend logging helpers that preserve explicit tracing targets.

import "@andypf/json-viewer";
import { invoke } from "@tauri-apps/api/core";
import type { FrontendLogPayload } from "./bindings/kb_app_demo_desktop/frontend_log/FrontendLogPayload.ts";

type FrontendLogLevel = "trace" | "debug" | "info" | "warn" | "error";

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 {
        return JSON.stringify(item);
    } catch (caughtError) {
        return String(item);
    }
}

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

async function sendFrontendLog(level: FrontendLogLevel, target: string, message: string): Promise<void> {
    const payload: FrontendLogPayload = {
        level,
        target,
        message,
    };
    try {
        await invoke("emit_frontend_log", { payload });
    } catch (caughtError) {
        originalConsole.error("frontend tracing bridge failed", caughtError);
    }
}

export function frontendTrace(target: string, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.trace(message);
    void sendFrontendLog("trace", target, message);
}

export function frontendDebug(target: string, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.debug(message);
    void sendFrontendLog("debug", target, message);
}

export function frontendInfo(target: string, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.info(message);
    void sendFrontendLog("info", target, message);
}

export function frontendWarn(target: string, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.warn(message);
    void sendFrontendLog("warn", target, message);
}

export function frontendError(target: string, ...items: unknown[]): void {
    const message = formatMessage(items);
    originalConsole.error(message);
    void sendFrontendLog("error", target, message);
}

function buildConsoleBridge(level: FrontendLogLevel, target: string, original: ConsoleMethod): ConsoleMethod {
    return (...items: unknown[]) => {
        original(...items);
        void sendFrontendLog(level, target, formatMessage(items));
    };
}


function upgradeJsonTextareas(): void {
    document.querySelectorAll<HTMLTextAreaElement>("textarea[data-json-viewer]").forEach(textarea => {
        if (textarea.dataset.jsonViewerInstalled === "true") {
            return;
        }
        textarea.dataset.jsonViewerInstalled = "true";
        const container = document.createElement("div");
        container.className = "app-json-viewer";
        const viewer = document.createElement("andypf-json-viewer");
        viewer.setAttribute("indent", "2");
        viewer.setAttribute("expanded", "1");
        viewer.setAttribute("theme", "default-light");
        viewer.setAttribute("show-data-types", "true");
        viewer.setAttribute("show-toolbar", "false");
        viewer.setAttribute("show-copy", "true");
        const descriptor = Object.getOwnPropertyDescriptor(HTMLTextAreaElement.prototype, "value");
        let currentValue = textarea.value;
        const render = (value: string): void => {
            currentValue = value;
            let parsed: unknown = value;
            try {
                parsed = JSON.parse(value) as unknown;
            } catch {
                parsed = { message: value };
            }
            viewer.setAttribute("data", JSON.stringify(parsed, null, 2));
        };
        Object.defineProperty(textarea, "value", {
            configurable: true,
            get: () => currentValue,
            set: (value: string) => {
                descriptor?.set?.call(textarea, value);
                render(value);
            },
        });
        textarea.classList.add("d-none");
        textarea.insertAdjacentElement("afterend", container);
        container.appendChild(viewer);
        render(currentValue);
    });
}

function upgradeLogOutputs(): void {
    document.querySelectorAll<HTMLTextAreaElement>("textarea[id$='LogOutput'], textarea[data-log-output]").forEach(textarea => {
        if (textarea.dataset.logOutputInstalled === "true") {
            return;
        }
        textarea.dataset.logOutputInstalled = "true";
        textarea.classList.add("app-log-output");
        const toolbar = document.createElement("div");
        toolbar.className = "d-flex justify-content-end gap-2 mb-2";
        const copyButton = document.createElement("button");
        copyButton.type = "button";
        copyButton.className = "btn btn-sm btn-outline-secondary";
        copyButton.textContent = "Copier";
        copyButton.addEventListener("click", () => {
            void navigator.clipboard.writeText(textarea.value);
        });
        const clearButton = document.createElement("button");
        clearButton.type = "button";
        clearButton.className = "btn btn-sm btn-outline-secondary";
        clearButton.textContent = "Effacer";
        clearButton.addEventListener("click", () => {
            textarea.value = "";
            textarea.dispatchEvent(new CustomEvent("app-log-clear"));
        });
        toolbar.append(copyButton, clearButton);
        textarea.insertAdjacentElement("beforebegin", toolbar);
    });
}

export function installFrontendConsoleBridge(target: string): void {
    upgradeJsonTextareas();
    upgradeLogOutputs();
    console.trace = buildConsoleBridge("trace", target, originalConsole.trace);
    console.debug = buildConsoleBridge("debug", target, originalConsole.debug);
    console.log = buildConsoleBridge("info", target, originalConsole.log);
    console.info = buildConsoleBridge("info", target, originalConsole.info);
    console.warn = buildConsoleBridge("warn", target, originalConsole.warn);
    console.error = buildConsoleBridge("error", target, originalConsole.error);
}