from __future__ import annotations

import json
import time
import uuid
import urllib.error
import urllib.request
from pathlib import Path
from typing import Any

from .config import settings


def _request_json(method: str, url: str, payload: dict[str, Any] | None = None, timeout: int = 10) -> dict[str, Any]:
    data = None
    headers = {"Accept": "application/json"}
    if payload is not None:
        data = json.dumps(payload, ensure_ascii=False).encode("utf-8")
        headers["Content-Type"] = "application/json"
    request = urllib.request.Request(url, data=data, headers=headers, method=method)
    try:
        with urllib.request.urlopen(request, timeout=timeout) as response:
            body = response.read().decode("utf-8", errors="replace")
            return {"passed": 200 <= response.status < 300, "status": response.status, "body": body, "json": json.loads(body) if body else None}
    except urllib.error.HTTPError as exc:
        body = exc.read().decode("utf-8", errors="replace")
        return {"passed": False, "status": exc.code, "body": body}
    except Exception as exc:
        return {"passed": False, "error": str(exc)}


def _request_text(url: str, timeout: int = 10) -> dict[str, Any]:
    try:
        with urllib.request.urlopen(url, timeout=timeout) as response:
            body = response.read().decode("utf-8", errors="replace")
            return {"passed": 200 <= response.status < 300, "status": response.status, "body": body}
    except Exception as exc:
        return {"passed": False, "error": str(exc)}


def _post_multipart(url: str, field: str, filename: str, content: bytes, content_type: str = "text/plain", timeout: int = 10) -> dict[str, Any]:
    boundary = f"----SegAcceptance{uuid.uuid4().hex}"
    body = b"".join(
        [
            f"--{boundary}\r\n".encode(),
            f'Content-Disposition: form-data; name="{field}"; filename="{filename}"\r\n'.encode(),
            f"Content-Type: {content_type}\r\n\r\n".encode(),
            content,
            f"\r\n--{boundary}--\r\n".encode(),
        ]
    )
    request = urllib.request.Request(
        url,
        data=body,
        method="POST",
        headers={"Content-Type": f"multipart/form-data; boundary={boundary}", "Accept": "application/json"},
    )
    try:
        with urllib.request.urlopen(request, timeout=timeout) as response:
            text = response.read().decode("utf-8", errors="replace")
            return {"passed": 200 <= response.status < 300, "status": response.status, "body": text, "json": json.loads(text) if text else None}
    except urllib.error.HTTPError as exc:
        text = exc.read().decode("utf-8", errors="replace")
        return {"passed": False, "status": exc.code, "body": text}
    except Exception as exc:
        return {"passed": False, "error": str(exc)}


def _poll_job(base_url: str, job_id: str, timeout: int = 90) -> dict[str, Any]:
    deadline = time.time() + timeout
    last = None
    while time.time() < deadline:
        result = _request_json("GET", f"{base_url}/api/jobs/{job_id}", timeout=10)
        last = result
        job = result.get("json") if result.get("passed") else None
        if job and job.get("status") in {"success", "failed", "cancelled"}:
            return {"passed": job.get("status") == "success", "job": job}
        time.sleep(1)
    return {"passed": False, "error": "job timed out", "last": last}


def _create_job_and_wait(base_url: str, task_type: str, params: dict[str, Any], timeout: int = 90) -> dict[str, Any]:
    created = _request_json("POST", f"{base_url}/api/jobs", {"type": task_type, "params": params}, timeout=10)
    if not created.get("passed") or not created.get("json"):
        return {"passed": False, "created": created}
    job_id = created["json"]["id"]
    polled = _poll_job(base_url, job_id, timeout=timeout)
    events = _request_text(f"{base_url}/api/jobs/{job_id}/events", timeout=10)
    return {"passed": polled["passed"], "created": created["json"], "polled": polled, "events": events}


def _create_job_with_retry(base_url: str, task_type: str, params: dict[str, Any], attempts: int = 2, timeout: int = 90) -> dict[str, Any]:
    results = []
    for _ in range(attempts):
        result = _create_job_and_wait(base_url, task_type, params, timeout=timeout)
        results.append(result)
        if result.get("passed"):
            return {"passed": True, "attempts": results}
        time.sleep(1)
    return {"passed": False, "attempts": results}


def _write_acceptance_images(root: Path) -> tuple[Path, Path, Path]:
    import cv2
    import numpy as np

    image_dir = root / "images"
    label_dir = root / "labels"
    result_dir = root / "stacked"
    image_dir.mkdir(parents=True, exist_ok=True)
    label_dir.mkdir(parents=True, exist_ok=True)
    result_dir.mkdir(parents=True, exist_ok=True)

    image = np.zeros((16, 16, 3), dtype=np.uint8)
    image[:, :, 1] = 180
    label = np.zeros((16, 16, 3), dtype=np.uint8)
    label[4:12, 4:12, 2] = 255
    image_path = image_dir / "sample.png"
    label_path = label_dir / "sample.png"
    cv2.imwrite(str(image_path), image)
    cv2.imwrite(str(label_path), label)
    return image_path, label_path, result_dir


def latest_acceptance_report() -> dict[str, Any]:
    path = settings.project_root / "var" / "acceptance" / "latest.json"
    if not path.exists():
        return {"available": False, "path": str(path)}
    return json.loads(path.read_text(encoding="utf-8"))


def run_live_acceptance(base_url: str = "http://127.0.0.1:8010") -> dict[str, Any]:
    """Run a lightweight end-to-end smoke against the live API and job runner."""
    acceptance_root = settings.project_root / "var" / "acceptance"
    run_id = uuid.uuid4().hex[:8]
    fixture_root = acceptance_root / f"run_{run_id}"
    fixture_root.mkdir(parents=True, exist_ok=True)

    checks: list[dict[str, Any]] = []

    dataset_name = f"acceptance_{run_id}"
    created_dataset = _request_json("POST", f"{base_url}/api/datasets", {"name": dataset_name, "description": "acceptance smoke"}, timeout=10)
    checks.append({"name": "create_dataset_api", "passed": created_dataset.get("passed", False), "detail": created_dataset})

    upload = _post_multipart(
        f"{base_url}/api/datasets/{dataset_name}/upload/labels",
        "files",
        "label 01.txt",
        b"0 0.5 0.5 0.25 0.25\n",
        "text/plain",
        timeout=10,
    )
    checks.append({"name": "upload_label_api", "passed": upload.get("passed", False), "detail": upload})

    artifact_ok = False
    artifact_detail: dict[str, Any] = {"skipped": True}
    try:
        relative_path = upload["json"]["saved"][0]["relative_path"]
        artifact_detail = _request_text(f"{base_url}/api/artifacts/{relative_path}", timeout=10)
        artifact_ok = artifact_detail.get("passed", False) and "0 0.5" in artifact_detail.get("body", "")
    except Exception as exc:
        artifact_detail = {"error": str(exc)}
    checks.append({"name": "artifact_api_for_uploaded_label", "passed": artifact_ok, "detail": artifact_detail})

    mock = _create_job_and_wait(base_url, "mock.echo", {"message": f"acceptance {run_id}"}, timeout=45)
    mock_log = mock.get("polled", {}).get("job", {}).get("log_tail", "")
    checks.append({"name": "mock_job_runner", "passed": mock.get("passed", False) and f"acceptance {run_id}" in mock_log, "detail": mock})

    image_path, label_path, result_dir = _write_acceptance_images(fixture_root)
    stack = _create_job_with_retry(
        base_url,
        "dataset.stack_single",
        {
            "image_path": str(image_path),
            "label_path": str(label_path),
            "result_dir": str(result_dir),
            "alpha": 0.35,
        },
        attempts=2,
        timeout=90,
    )
    output_path = result_dir / "sample.png"
    checks.append(
        {
            "name": "legacy_stack_job_runner",
            "passed": stack.get("passed", False) and output_path.exists() and output_path.stat().st_size > 0,
            "detail": {**stack, "output_path": str(output_path), "output_exists": output_path.exists()},
        }
    )

    report = {
        "available": True,
        "run_id": run_id,
        "base_url": base_url,
        "passed": all(item["passed"] for item in checks),
        "checks": checks,
        "created_at": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
    }
    latest = acceptance_root / "latest.json"
    latest.write_text(json.dumps(report, ensure_ascii=False, indent=2), encoding="utf-8")
    return report