import * as vscode from "vscode";
import * as fs from "fs";
import * as os from "os";
import * as path from "path";
import fetch from "node-fetch";



// ================= LOGGING SETUP =================
export const updaterOutput = vscode.window.createOutputChannel("Updater");

export function logDebug(...args: any[]) {
    const message = args
        .map(a => (typeof a === "object" ? JSON.stringify(a, null, 2) : a))
        .join(" ");
    updaterOutput.appendLine(message);
    console.log(message); // optional, still shows in DevTools
    updaterOutput.show(true);
}


// ================= CONFIG =================
const CONFIG = {
    apiBase: "https://git.cstmgames.dev/api/v1",
    repo: "CSTMGames/FiveM_Snippets",
    extensionId: "kj4lxc.cstmgames-fivem-snippets",

    checkIntervalMs: 1000 * 60 * 60 * 6, // 6 hours
    allowPrerelease: false,

    authToken: "", // optional: "your_gitea_token"
};

// ================= UPDATER =================
export async function runUpdater(context: vscode.ExtensionContext) {
    // Run once on startup (silent)
    await checkForUpdates(context, true);

    // Schedule periodic checks
    setInterval(() => {
        checkForUpdates(context, true);
    }, CONFIG.checkIntervalMs);
}

export async function manualUpdateCheck(context: vscode.ExtensionContext) {
    await checkForUpdates(context, false);
}

async function checkForUpdates(
    context: vscode.ExtensionContext,
    silent: boolean
) {
    try {
        // Read user settings dynamically
        const autoInstall = vscode.workspace
            .getConfiguration("cstmgames.fivem_snippets")
            .get<boolean>("autoUpdate", false);

        const now = Date.now();
        const lastCheck = context.globalState.get<number>("lastUpdateCheck") || 0;

        // Prevent too frequent checks
        if (now - lastCheck < CONFIG.checkIntervalMs && silent) return;

        context.globalState.update("lastUpdateCheck", now);

        // Build Gitea releases URL
        const url = `${CONFIG.apiBase}/repos/${CONFIG.repo}/releases`;

        // Build headers safely
        const headers: Record<string, string> = {};
        if (CONFIG.authToken && CONFIG.authToken.length > 0) {
            headers["Authorization"] = `token ${CONFIG.authToken}`;
        }

        logDebug(`[Updater] Checking Gitea releases URL: ${url}`);
        logDebug(`[Updater] Headers:`, headers);

        const res = await fetch(url, { headers });

        logDebug(`[Updater] HTTP status: ${res.status}`);
        if (!res.ok) throw new Error(`HTTP ${res.status}`);

        const dataRaw = await res.json() as unknown;
        let data: any[] = [];

        if (Array.isArray(dataRaw)) {
            data = dataRaw;
        } else {
            logDebug("[Updater] Unexpected API response:", dataRaw);
        }
        logDebug(`[Updater] Releases data:`, data);

        if (!Array.isArray(data) || data.length === 0) {
            console.warn("[Updater] No releases found.");
            return;
        }

        // Take the latest release (first in array)
        const latestRelease = data[0];
        const latestVersion = latestRelease.tag_name.replace(/^v/, "");

        const ext = vscode.extensions.getExtension(CONFIG.extensionId);
        if (!ext) {
            console.warn(`[Updater] Extension ${CONFIG.extensionId} not found`);
            return;
        }

        const currentVersion = ext.packageJSON.version;
        logDebug(`[Updater] Current version: ${currentVersion}, Latest version: ${latestVersion}`);

        if (latestVersion === currentVersion) {
            if (!silent) vscode.window.showInformationMessage("Extension is up to date.");
            return;
        }

        const asset = latestRelease.assets?.find((a: any) => a.name.endsWith(".vsix"));
        if (!asset) {
            console.warn("[Updater] No VSIX asset found in latest release");
            return;
        }

        logDebug(`[Updater] Latest VSIX URL: ${asset.browser_download_url}`);

        if (autoInstall) {
            await installVsix(asset.browser_download_url);
            return;
        }

        const choice = await vscode.window.showInformationMessage(
            `Update available: ${currentVersion} → ${latestVersion}`,
            "Install",
            "Later"
        );

        if (choice === "Install") {
            await installVsix(asset.browser_download_url);
        }

    } catch (err) {
        console.error("[Updater] Error checking updates:", err);
        if (!silent) {
            vscode.window.showErrorMessage(`Failed to check for updates: ${err}`);
        }
    }
}

// ================= INSTALL FUNCTION =================
async function installVsix(url: string) {
    const tmpFile = path.join(os.tmpdir(), "update.vsix");

    try {
        logDebug("[Updater] Downloading VSIX from:", url);

        // Fetch the VSIX
        const res = await fetch(url);
        if (!res.ok) throw new Error(`HTTP ${res.status}`);

        const buffer = Buffer.from(await res.arrayBuffer());

        // Save to temp file
        fs.writeFileSync(tmpFile, buffer);
        logDebug("[Updater] VSIX saved to temp file:", tmpFile);

        // Install extension from local file
        await vscode.commands.executeCommand(
            "workbench.extensions.installExtension",
            vscode.Uri.file(tmpFile)
        );
        logDebug("[Updater] Installed VSIX from temp file");

        // Ask user to reload
        const reload = await vscode.window.showInformationMessage(
            "Extension updated successfully.",
            "Reload Now"
        );

        if (reload === "Reload Now") {
            await vscode.commands.executeCommand("workbench.action.reloadWindow");
        }

    } catch (err) {
        logDebug("[Updater] Install failed:", err);
        vscode.window.showErrorMessage("Failed to install update.");
    } finally {
        // Clean up temp file
        try {
            if (fs.existsSync(tmpFile)) {
                fs.unlinkSync(tmpFile);
                logDebug("[Updater] Deleted temp VSIX file:", tmpFile);
            }
        } catch (cleanupErr) {
            logDebug("[Updater] Failed to delete temp VSIX file:", cleanupErr);
        }
    }
}