import { createWriteStream } from "node:fs";
import path, { join } from "node:path";
import { APPLICATIONS_PATH, COMPOSE_PATH, SSH_PATH } from "@/server/constants";
import { TRPCError } from "@trpc/server";
import { recreateDirectory } from "../filesystem/directory";
import { execAsync } from "../process/execAsync";
import { spawnAsync } from "../process/spawnAsync";

export const cloneGitRepository = async (
	entity: {
		appName: string;
		customGitUrl?: string | null;
		customGitBranch?: string | null;
		customGitSSHKeyId?: string | null;
	},
	logPath: string,
	isCompose = false,
) => {
	const { appName, customGitUrl, customGitBranch, customGitSSHKeyId } = entity;

	if (!customGitUrl || !customGitBranch) {
		throw new TRPCError({
			code: "BAD_REQUEST",
			message: "Error: Repository not found",
		});
	}

	const writeStream = createWriteStream(logPath, { flags: "a" });
	const keyPath = path.join(SSH_PATH, `${customGitSSHKeyId}_rsa`);
	const basePath = isCompose ? COMPOSE_PATH : APPLICATIONS_PATH;
	const outputPath = join(basePath, appName, "code");
	const knownHostsPath = path.join(SSH_PATH, "known_hosts");

	try {
		await addHostToKnownHosts(customGitUrl);
		await recreateDirectory(outputPath);
		// const command = `GIT_SSH_COMMAND="ssh -i ${keyPath} -o UserKnownHostsFile=${knownHostsPath}" git clone --branch ${customGitBranch} --depth 1 ${customGitUrl} ${gitCopyPath} --progress`;
		// const { stdout, stderr } = await execAsync(command);
		writeStream.write(
			`\nCloning Repo Custom ${customGitUrl} to ${outputPath}: ✅\n`,
		);
		console.log(customGitSSHKeyId);
		await spawnAsync(
			"git",
			[
				"clone",
				"--branch",
				customGitBranch,
				"--depth",
				"1",
				customGitUrl,
				outputPath,
				"--progress",
			],
			(data) => {
				if (writeStream.writable) {
					writeStream.write(data);
				}
			},
			{
				env: {
					...process.env,
					...(customGitSSHKeyId && {
						GIT_SSH_COMMAND: `ssh -i ${keyPath} -o UserKnownHostsFile=${knownHostsPath}`,
					}),
				},
			},
		);
		writeStream.write(`\nCloned Custom Git ${customGitUrl}: ✅\n`);
	} catch (error) {
		writeStream.write(`\nERROR Cloning Custom Git: ${error}: ❌\n`);
		throw error;
	} finally {
		writeStream.end();
	}
};

const addHostToKnownHosts = async (repositoryURL: string) => {
	const { domain, port } = sanitizeRepoPathSSH(repositoryURL);
	const knownHostsPath = path.join(SSH_PATH, "known_hosts");

	const command = `ssh-keyscan -p ${port} ${domain} >> ${knownHostsPath}`;
	try {
		await execAsync(command);
	} catch (error) {
		console.error(`Error adding host to known_hosts: ${error}`);
		throw error;
	}
};
const sanitizeRepoPathSSH = (input: string) => {
	const SSH_PATH_RE = new RegExp(
		[
			/^\s*/,
			/(?:(?<proto>[a-z]+):\/\/)?/,
			/(?:(?<user>[a-z_][a-z0-9_-]+)@)?/,
			/(?<domain>[^\s\/\?#:]+)/,
			/(?::(?<port>[0-9]{1,5}))?/,
			/(?:[\/:](?<owner>[^\s\/\?#:]+))?/,
			/(?:[\/:](?<repo>(?:[^\s\?#:.]|\.(?!git\/?\s*$))+))/,
			/(?:.git)?\/?\s*$/,
		]
			.map((r) => r.source)
			.join(""),
		"i",
	);

	const found = input.match(SSH_PATH_RE);
	if (!found) {
		throw new Error(`Malformatted SSH path: ${input}`);
	}

	return {
		user: found.groups?.user ?? "git",
		domain: found.groups?.domain,
		port: 22,
		owner: found.groups?.owner ?? "",
		repo: found.groups?.repo,
		get repoPath() {
			return `ssh://${this.user}@${this.domain}:${this.port}/${this.owner}${
				this.owner && "/"
			}${this.repo}.git`;
		},
	};
};