const vscode = require("vscode");
const util = require("node:util");
const chp = require("child_process");
const execP = util.promisify(chp.exec);

let isOutPutChannelVisible = false,
	logOutputChannel,
	statusBarItem;

/**
 * @param {vscode.ExtensionContext} context
 */
async function activate(context) {
	let disposable;

	logOutputChannel = makeLogOutputChannel("gitDWMSimpleUse");
	statusBarItem = makeStatusBarItem();
	context.subscriptions.push(
		vscode.commands.registerCommand("gitDWMSimpleUse.ToggleOutputChannel", () => {
			if (isOutPutChannelVisible) logOutputChannel.hide();
			else logOutputChannel.show(true);
			isOutPutChannelVisible = !isOutPutChannelVisible;
		})
	);

	try {
		process.chdir(vscode.workspace.workspaceFolders[0].uri.fsPath);
	} catch (err) {
		vscode.window.showErrorMessage(err);
	}

	if (await isInGitRepo()) {
		statusBarItem.show();
		if (!(await hasConflicts(true)))
			makeSpawn("openPull", "git pull --rebase --autostash", { shell: true });
	}

	context.subscriptions.push(makeDocumentLinkProvider());

	disposable = vscode.commands.registerCommand("dwm-git-simpleuse.fullPush", async function () {
		if (
			!(await isInGitRepo(true)) ||
			(await hasConflicts(true)) ||
			(await isWorkingTreeClean(true))
		)
			return;

		let commitMsg = await vscode.window.showInputBox({
			placeHolder: "commit message",
			prompt: "choose your commit message",
			value: ((await context.workspaceState.get("lastGitCommitMsg")) || "").incrementSuffixe(),
		});
		if (commitMsg === undefined) return;
		commitMsg = commitMsg.trim();
		if (!commitMsg.length) {
			vscode.window.showErrorMessage("commit message needed");
			return;
		}

		context.workspaceState.update("lastGitCommitMsg", commitMsg);

		await makeSpawn("fullPush-pull", `git pull --rebase --autostash`, { shell: true });
		if (await hasConflicts(true)) return;
		makeSpawn(
			"fullPush",
			`git add . && git commit -am "${commitMsg.replace(/"/g, '\\"')}" && git push`,
			{ shell: true }
		);
	});
	context.subscriptions.push(disposable);

	disposable = vscode.commands.registerCommand("dwm-git-simpleuse.initRepo", async function () {
		if (!(await isInGitRepo(true))) return;

		let gitLink = await vscode.window.showInputBox({
			placeHolder: "git repo link",
			prompt: "Initialize a git repository",
			value: await vscode.env.clipboard.readText(),
		});
		if (gitLink === undefined) return;
		gitLink = gitLink.trim();
		if (!gitLink.match(/^https?:\/\/\S+\.git$/).length) {
			vscode.window.showErrorMessage("Link not valid");
			return;
		}

		let gitBranch = await vscode.window.showInputBox({
			placeHolder: "git branch",
			prompt: "choose wich branch to use (defaults to 'main')",
			value: "main",
		});
		if (gitBranch === undefined) return;
		gitBranch = gitBranch.trim();
		if (!gitBranch.length) gitBranch = "main";

		makeSpawn(
			"initRepo",
			`git init && git remote add origin ${gitLink} && git fetch && git checkout -ft origin/${gitBranch}`,
			{ shell: true }
		);
	});
	context.subscriptions.push(disposable);
}

// This method is called when your extension is deactivated
function deactivate() {}

module.exports = {
	activate,
	deactivate,
};

function makeSpawn(name, command, options = {}) {
	return new Promise((resolve) => {
		statusBarItem.text = "$(loading~spin) GitDWMSU";
		statusBarItem.tooltip = name;
		let spawn = chp.spawn(`${command} 2>&1 || echo 'gitSU_error'`, options);
		spawn.stdout.on("data", (d) => {
			if (/\n\s*gitSU_error[\s\n]*$/.test(d.toString())) {
				statusBarItem.backgroundColor = new vscode.ThemeColor("statusBarItem.errorBackground");
				setTimeout(() => {
					statusBarItem.backgroundColor = new vscode.ThemeColor("statusBarItem.background");
				}, 5000);
				vscode.window.showErrorMessage(`[${name}] An error occurred`, "Show").then((e) => {
					if (e == "Show") {
						logOutputChannel.show(true);
						isOutPutChannelVisible = true;
					}
				});
				logOutputChannel.error(`[${name}] ${d.toString().replace(/\n\s*gitSU_error[\s]*/, "")}`);
			} else logOutputChannel.info(`[${name}] ${d.toString()}`);
		});
		spawn.stderr.on("data", (d) => {
			logOutputChannel.error(`[${name}] ${d.toString()}`);
		});
		spawn.on("close", (c) => {
			logOutputChannel.trace(`[${name}] child process exited with code ${c}`);
			statusBarItem.text = "$(remote) GitDWMSU";
			statusBarItem.tooltip = "";
			resolve();
		});
	});
}

async function isWorkingTreeClean(doActions = false) {
	const { stdout } = await execP(`git status --porcelain`);
	if (doActions && stdout.trim() == "") vscode.window.showErrorMessage(`Working tree is clean`);
	return stdout.trim() == "";
}

async function isInGitRepo(doActions = false) {
	const { stdout } = await execP(`git rev-parse --is-inside-work-tree || echo false`);
	if (doActions && stdout.trim() !== "true") vscode.window.showErrorMessage("Not a git repository");
	return stdout.trim() === "true";
}

async function hasConflicts(doActions = false) {
	const { stdout } = await execP(`git diff --name-only --diff-filter=U`);
	if (doActions && stdout.trim() != "") {
		vscode.window
			.showErrorMessage(
				`You have to resolve conflicts :\n${stdout.trim().replace("\n", ", ")}`,
				"Show files",
				"Git pull"
			)
			.then(async (e) => {
				if (e == "Show files") {
					logOutputChannel.show(true);
					isOutPutChannelVisible = true;
				} else if (e == "Git pull" && !(await hasConflicts(true))) {
					makeSpawn("openPull", "git pull --rebase --autostash", { shell: true });
				}
			});
		logOutputChannel.error(
			"[conflicts] Conflicted files : \n" +
				stdout
					.split("\n")
					.filter((e) => e.trim().length)
					.map((e) => `F:${e}#`)
					.join("\n")
		);
	}
	return stdout.trim() != "";
}

String.prototype.incrementSuffixe = function () {
	const match = this.match(/\s*\((\d+)\)\s*$/);
	return match
		? this.replace(new RegExp(`${match[0].escapeRegex()}$`), ` (${+match[1] + 1})`)
		: this.trim().length
		? this + " (1)"
		: this.trim();
};

String.prototype.escapeRegex = function () {
	return this.replace(/[/\-\\^$*+?.()|[\]{}]/g, "\\$&");
};

function makeLogOutputChannel(name) {
	return vscode.window.createOutputChannel(name, {
		log: true,
		logLevel: 3,
	});
}

function makeStatusBarItem() {
	let s = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left, 100);
	s.text = "$(remote) GitDWMSU";
	s.command = "gitDWMSimpleUse.ToggleOutputChannel";
	return s;
}

function makeDocumentLinkProvider() {
	return vscode.languages.registerDocumentLinkProvider(
		{ language: "log", scheme: "output" },
		{
			provideDocumentLinks(doc) {
				const links = [];

				const regex = /F(ile|older)?:([^#]+)#/g;
				for (let line = 0; line < doc.lineCount; line++) {
					let text = doc.lineAt(line).text;
					let match;
					while ((match = regex.exec(text)) !== null) {
						const _index = match.index + 2 + (match[1] ? match[1].length : 0);
						const range = new vscode.Range(
							new vscode.Position(line, _index),
							new vscode.Position(line, _index + match[2].length)
						);
						links.push(
							new vscode.DocumentLink(
								range,
								vscode.Uri.file(
									(match[1] ? "" : `${vscode.workspace.workspaceFolders[0].uri.fsPath}/`) + match[2]
								)
							)
						);
					}
				}

				return links;
			},
		}
	);
}