from __future__ import annotations

import argparse
import json
import shutil
import subprocess
import sys
from dataclasses import dataclass
from pathlib import Path
from typing import Sequence

ROOT_DIR = Path(__file__).resolve().parent.parent
if str(ROOT_DIR) not in sys.path:
    sys.path.insert(0, str(ROOT_DIR))

from scripts.verify_site import verify_site


DEFAULT_SITE_URL = "https://arabic-translator-mu.vercel.app"
DIRECT_CLOUD_ENV_KEYS = ["ENABLE_DIRECT_CLOUD_TTS", "HF_API_TOKEN", "HF_TTS_MODEL", "DEFAULT_VOICE_ID"]
VERCEL_COMMAND = shutil.which("vercel") or shutil.which("vercel.cmd") or "vercel"


@dataclass
class CommandResult:
    command: list[str]
    returncode: int
    stdout: str
    stderr: str


def normalize_url(value: str) -> str:
    return value.rstrip("/")


def looks_like_hf_space(url: str) -> bool:
    host = url.split("://", 1)[-1].split("/", 1)[0].lower()
    return host == "hf.space" or host.endswith(".hf.space")


def validate_worker_url(worker_url: str) -> str:
    worker_url = normalize_url(worker_url.strip())
    if not worker_url.startswith("https://"):
        raise ValueError("WORKER_BASE_URL must start with https://")
    if "localhost" in worker_url or "127.0.0.1" in worker_url:
        raise ValueError("WORKER_BASE_URL must be public, not localhost")
    if ".vercel.app" in worker_url:
        raise ValueError("WORKER_BASE_URL must point at the worker, not the Vercel site")
    if not looks_like_hf_space(worker_url):
        raise ValueError("WORKER_BASE_URL should be a Hugging Face Space URL ending in .hf.space")
    return worker_url


def run_command(command: Sequence[str], input_text: str | None = None, check: bool = True) -> CommandResult:
    completed = subprocess.run(
        list(command),
        input=input_text,
        text=True,
        capture_output=True,
    )
    result = CommandResult(
        command=list(command),
        returncode=completed.returncode,
        stdout=completed.stdout,
        stderr=completed.stderr,
    )
    if check and completed.returncode != 0:
        message = completed.stderr.strip() or completed.stdout.strip() or f"command failed with {completed.returncode}"
        raise RuntimeError(f"{' '.join(command)} failed: {message}")
    return result


def remove_vercel_env(name: str, environment: str) -> CommandResult:
    result = run_command([VERCEL_COMMAND, "env", "rm", name, environment, "--yes"], check=False)
    combined = f"{result.stdout}\n{result.stderr}"
    if result.returncode != 0 and "env_not_found" not in combined and "was not found" not in combined:
        message = result.stderr.strip() or result.stdout.strip() or f"command failed with {result.returncode}"
        raise RuntimeError(f"vercel env rm {name} failed: {message}")
    return result


def add_vercel_env(name: str, value: str, environment: str) -> CommandResult:
    return run_command([VERCEL_COMMAND, "env", "add", name, environment], input_text=f"{value}\n")


def configure_vercel_worker(
    worker_url: str,
    site_url: str = DEFAULT_SITE_URL,
    code: str = "1234",
    environment: str = "production",
    redeploy: bool = True,
    verify: bool = False,
    timeout: float = 60,
) -> dict[str, object]:
    worker_url = validate_worker_url(worker_url)
    site_url = normalize_url(site_url)
    commands: list[CommandResult] = []

    commands.append(remove_vercel_env("WORKER_BASE_URL", environment))
    commands.append(add_vercel_env("WORKER_BASE_URL", worker_url, environment))
    for key in DIRECT_CLOUD_ENV_KEYS:
        commands.append(remove_vercel_env(key, environment))
    if redeploy:
        commands.append(run_command([VERCEL_COMMAND, "deploy", "--prod", "--yes"]))

    site_checks = None
    if verify:
        site_checks = [check.__dict__ for check in verify_site(site_url, code, worker_url, timeout=timeout)]

    return {
        "workerUrl": worker_url,
        "siteUrl": site_url,
        "environment": environment,
        "redeployed": redeploy,
        "verified": verify,
        "commands": [
            {
                "command": result.command,
                "returncode": result.returncode,
                "stdout": result.stdout,
                "stderr": result.stderr,
            }
            for result in commands
        ],
        "siteChecks": site_checks,
        "nextCommand": (
            f"python scripts\\prove_live_deployment.py {worker_url} --origin {site_url} "
            f"--code {code} --smoke-ocr-engine arabic"
        ),
    }


def main_with_args(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(description="Set Vercel WORKER_BASE_URL, redeploy, and optionally verify the site.")
    parser.add_argument("worker_url", help="Public Hugging Face Space worker URL, e.g. https://user-space.hf.space")
    parser.add_argument("--site-url", default=DEFAULT_SITE_URL)
    parser.add_argument("--code", default="1234")
    parser.add_argument("--environment", default="production")
    parser.add_argument("--no-redeploy", action="store_true")
    parser.add_argument("--verify", action="store_true", help="Run scripts.verify_site after redeploy.")
    parser.add_argument("--timeout", type=float, default=60)
    parser.add_argument("--json", action="store_true")
    args = parser.parse_args(argv)

    result = configure_vercel_worker(
        args.worker_url,
        site_url=args.site_url,
        code=args.code,
        environment=args.environment,
        redeploy=not args.no_redeploy,
        verify=args.verify,
        timeout=args.timeout,
    )
    if args.json:
        print(json.dumps(result, indent=2))
    else:
        print(f"Configured WORKER_BASE_URL={result['workerUrl']}")
        if result["redeployed"]:
            print("Redeployed Vercel production.")
        print("Next:")
        print(result["nextCommand"])
    site_checks = result.get("siteChecks")
    if site_checks is not None and not all(check["ok"] for check in site_checks):
        return 1
    return 0


def main() -> int:
    return main_with_args()


if __name__ == "__main__":
    raise SystemExit(main())