import { mkdir, rm } from "node:fs/promises";
import { execFile } from "node:child_process";
import { promisify } from "node:util";

import { NextResponse } from "next/server";

import {
  getProjectPath,
  getProjectsRoot,
  projectNameSchema,
} from "@/lib/projects";

export const runtime = "nodejs";

const execFileAsync = promisify(execFile);

export async function POST(request: Request) {
  let body: unknown;

  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: "The request body must be valid JSON." }, { status: 400 });
  }

  const result = projectNameSchema.safeParse(
    typeof body === "object" && body !== null && "name" in body
      ? (body as { name: unknown }).name
      : undefined,
  );

  if (!result.success) {
    return NextResponse.json(
      { error: result.error.issues[0]?.message || "Enter a valid project name." },
      { status: 400 },
    );
  }

  const name = result.data;
  const projectPath = getProjectPath(name);
  let directoryCreated = false;

  try {
    await mkdir(getProjectsRoot(), { recursive: true });
    await mkdir(projectPath);
    directoryCreated = true;

    await execFileAsync("git", ["init"], { cwd: projectPath });

    return NextResponse.json(
      { name, path: projectPath, gitInitialized: true },
      { status: 201 },
    );
  } catch (error) {
    if (directoryCreated) {
      await rm(projectPath, { recursive: true, force: true }).catch(() => undefined);
    }

    const code = error && typeof error === "object" && "code" in error
      ? (error as { code?: string }).code
      : undefined;

    if (code === "EEXIST") {
      return NextResponse.json(
        { error: "A project with that name already exists." },
        { status: 409 },
      );
    }

    if (code === "ENOENT") {
      return NextResponse.json(
        { error: "Git was not found. Install Git and try again." },
        { status: 503 },
      );
    }

    console.error("Project creation failed", error);
    return NextResponse.json(
      { error: "The project could not be created. Check the server logs for details." },
      { status: 500 },
    );
  }
}