"""
Integration tests for the full /analyze pipeline.
All external boundaries are mocked (LLM, git clone, Redis).
These tests verify the complete request → response cycle including:
  - cache miss → pipeline → cache write
  - cache hit → immediate return
  - async job submission → poll → result
  - rate limiting behaviour
  - auth enforcement
"""
from __future__ import annotations

import json
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from fastapi.testclient import TestClient

from app.api.limiter import limiter
from app.api.main import app

limiter.enabled = False
client = TestClient(app)

VALID_URL = "https://github.com/owner/repo"

# ── shared LLM response stubs ──────────────────────────────────────────────

REPO_ANALYSIS_RESPONSE = json.dumps({
    "language": "Python",
    "frameworks": ["FastAPI"],
    "architecture": "multi-agent",
    "entry_points": ["app/main.py"],
    "summary": "A test repository.",
})

BUG_DETECTION_RESPONSE = json.dumps({
    "critical": [],
    "warnings": [{"description": "Missing type hint", "file": "main.py"}],
    "suggestions": [],
})

CODE_REVIEW_RESPONSE = json.dumps({
    "solid_violations": [],
    "duplicate_code": [],
    "refactor_suggestions": ["Add docstrings"],
    "overall_score": 8.0,
    "summary": "Clean code overall.",
})

REPORT_RESPONSE = "# Engineering Report\nRepository looks good."
TEST_GEN_RESPONSE = "def test_placeholder():\n    assert True\n"

SPECIALIST_RESPONSES = [
    json.dumps({"security": []}),
    json.dumps({"performance": []}),
    json.dumps({"architecture": []}),
    json.dumps({"overall_score": 8.0, "summary": "Solid.", "top_priority": "None"}),
]


@pytest.fixture
def fake_repo(tmp_path):
    (tmp_path / "main.py").write_text("def hello(): return 'world'\n")
    return str(tmp_path)


@pytest.fixture
def mock_pipeline(fake_repo):
    """Patch all external boundaries for a clean pipeline run."""
    llm_iter = iter([
        REPO_ANALYSIS_RESPONSE,
        BUG_DETECTION_RESPONSE,
        *SPECIALIST_RESPONSES,
        REPORT_RESPONSE,
    ])
    return {
        "clone": patch("app.services.analysis_service.clone_repository", return_value=fake_repo),
        "delete": patch("app.services.analysis_service.delete_repository"),
        "sha": patch("app.services.analysis_service.resolve_remote_head_sha", return_value=None),
        "llm": patch("app.core.llm._call_llm_with_model", new=AsyncMock(side_effect=lambda *a, **kw: next(llm_iter))),
        "llm_review": patch("app.agents.code_review_agent.call_llm_for_json", new=AsyncMock(return_value=json.loads(CODE_REVIEW_RESPONSE))),
        "llm_test": patch("app.agents.test_generation_agent.call_llm_routed", new=AsyncMock(return_value=TEST_GEN_RESPONSE)),
        "llm_report": patch("app.agents.report_generator_agent.call_llm_routed", new=AsyncMock(return_value=REPORT_RESPONSE)),
        "dep_scan": patch("app.tools.dependency_scanner.scan_dependencies", return_value=[]),
        "settings": patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    }


# ── cache miss → pipeline → success ───────────────────────────────────────

def test_analyze_cache_miss_runs_full_pipeline(mock_pipeline, fake_repo):
    """On cache miss, full pipeline runs and returns a valid EngineeringReport."""
    with (
        mock_pipeline["clone"],
        mock_pipeline["delete"],
        mock_pipeline["sha"],
        mock_pipeline["llm"],
        mock_pipeline["llm_review"],
        mock_pipeline["llm_test"],
        mock_pipeline["llm_report"],
        mock_pipeline["dep_scan"],
        mock_pipeline["settings"],
    ):
        response = client.post("/api/v1/analyze", json={"github_url": VALID_URL})

    assert response.status_code == 200
    data = response.json()
    assert "repository" in data
    assert "issues" in data
    assert "review" in data
    assert "full_report" in data
    assert data["from_cache"] is False


def test_analyze_cache_hit_returns_immediately():
    """On cache hit, the cached report is returned with from_cache=True."""
    from app.models.issue import IssueReport
    from app.models.report import EngineeringReport
    from app.models.repository import RepositoryMetadata
    from app.models.review import GeneratedTests, ReviewSuggestions

    cached_report = EngineeringReport(
        repository=RepositoryMetadata(
            url=VALID_URL, name="repo", local_path="/tmp/x",
            language="Python", frameworks=[], architecture="",
            entry_points=[], summary="cached",
        ),
        issues=IssueReport(),
        review=ReviewSuggestions(summary="cached review", overall_score=9.0),
        tests=GeneratedTests(),
        full_report="# Cached Report",
        generated_at="2026-01-01T00:00:00Z",
        from_cache=True,
    )

    with (
        patch("app.services.analysis_service.resolve_remote_head_sha", return_value="abc123"),
        patch("app.services.analysis_service.get_cached_report", return_value=cached_report),
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        response = client.post("/api/v1/analyze", json={"github_url": VALID_URL})

    assert response.status_code == 200
    data = response.json()
    assert data["from_cache"] is True
    assert data["full_report"] == "# Cached Report"


# ── auth enforcement ───────────────────────────────────────────────────────

def test_analyze_rejects_missing_api_key_integration():
    """Requests without X-API-Key are rejected when a key is configured."""
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="secret")):
        response = client.post("/api/v1/analyze", json={"github_url": VALID_URL})
    assert response.status_code == 401


def test_analyze_rejects_wrong_api_key_integration():
    """Requests with the wrong key are rejected."""
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="secret")):
        response = client.post(
            "/api/v1/analyze",
            json={"github_url": VALID_URL},
            headers={"X-API-Key": "wrong"},
        )
    assert response.status_code == 401


# ── input validation ───────────────────────────────────────────────────────

def test_analyze_rejects_non_github_url():
    """Non-GitHub URLs must be rejected before any pipeline runs."""
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")):
        response = client.post(
            "/api/v1/analyze", json={"github_url": "https://gitlab.com/owner/repo"}
        )
    assert response.status_code == 422


def test_analyze_rejects_empty_url():
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")):
        response = client.post("/api/v1/analyze", json={"github_url": ""})
    assert response.status_code == 422


# ── async job flow ─────────────────────────────────────────────────────────

def test_async_analyze_returns_job_id():
    """POST /analyze/async returns 202 with a job_id immediately."""
    with (
        patch("app.worker.tasks.analyze_repository_task.delay") as mock_delay,
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        mock_task = MagicMock()
        mock_task.id = "test-job-123"
        mock_delay.return_value = mock_task

        response = client.post("/api/v1/analyze/async", json={"github_url": VALID_URL})

    assert response.status_code == 202

    data = response.json()
    assert data["job_id"] == "test-job-123"
    assert data["status"] == "pending"


def test_job_status_pending():
    """Polling an unknown job returns pending status."""
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")):
        response = client.get("/api/v1/jobs/nonexistent-job-id")
    assert response.status_code == 200
    assert response.json()["status"] == "pending"


# ── health and metrics ─────────────────────────────────────────────────────

def test_health_endpoint_no_auth_required():
    response = client.get("/api/v1/health")
    assert response.status_code == 200
    assert response.json()["status"] == "ok"


def test_metrics_endpoint_returns_snapshot():
    with patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")):
        response = client.get("/api/v1/metrics")
    assert response.status_code == 200
    assert isinstance(response.json(), dict)

    
# ── async job submission → poll → completion ───────────────────────────────

def test_async_job_submission_returns_job_id(mock_pipeline, fake_repo):
    """POST /analyze/async must return a job_id immediately."""
    with (
        mock_pipeline["clone"],
        mock_pipeline["delete"],
        mock_pipeline["sha"],
        mock_pipeline["llm"],
        mock_pipeline["llm_review"],
        mock_pipeline["llm_test"],
        mock_pipeline["llm_report"],
        mock_pipeline["dep_scan"],
        mock_pipeline["settings"],
        patch("app.worker.tasks.analyze_repository_task.apply_async") as mock_task,
    ):
        mock_task.return_value.id = "test-job-id-001"
        response = client.post(
            "/api/v1/analyze/async",
            json={"github_url": VALID_URL},
        )

    assert response.status_code == 202
    data = response.json()
    assert "job_id" in data
    assert isinstance(data["job_id"], str)
    assert len(data["job_id"]) > 0


def test_async_job_poll_returns_pending_while_running():
    """GET /jobs/{id} returns 'pending' or 'started' while the task runs."""
    from unittest.mock import MagicMock
    from celery.result import AsyncResult

    mock_result = MagicMock(spec=AsyncResult)
    mock_result.state  = "STARTED"
    mock_result.ready.return_value = False
    mock_result.failed.return_value = False

    with (
        patch("app.api.routes.AsyncResult", return_value=mock_result),
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        response = client.get("/api/v1/jobs/test-job-id-001")

    assert response.status_code == 200
    data = response.json()
    assert data["status"] in ("pending", "started", "STARTED")


def test_async_job_poll_returns_result_when_complete():
    """GET /jobs/{id} returns the full report once the task succeeds."""
    from unittest.mock import MagicMock
    from celery.result import AsyncResult
    from app.models.issue import IssueReport
    from app.models.report import EngineeringReport
    from app.models.repository import RepositoryMetadata
    from app.models.review import GeneratedTests, ReviewSuggestions

    finished_report = EngineeringReport(
        repository=RepositoryMetadata(
            url=VALID_URL, name="repo", local_path="/tmp/x",
            language="Python", frameworks=[], architecture="",
            entry_points=[], summary="async test repo",
        ),
        issues=IssueReport(),
        review=ReviewSuggestions(summary="Looks good.", overall_score=9.0),
        tests=GeneratedTests(),
        full_report="# Async Report\nAll clear.",
        generated_at="2026-01-01T00:00:00Z",
        from_cache=False,
    )

    mock_result = MagicMock(spec=AsyncResult)
    mock_result.state               = "SUCCESS"
    mock_result.status              = "SUCCESS"
    mock_result.ready.return_value  = True
    mock_result.failed.return_value = False
    mock_result.result         = finished_report.model_dump()

    with (
        patch("app.api.routes.AsyncResult", return_value=mock_result),
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        response = client.get("/api/v1/jobs/test-job-id-001")

    assert response.status_code == 200
    data = response.json()
    assert data["status"] in ("success", "SUCCESS", "completed")
    assert "result" in data or "full_report" in data.get("result", data)


def test_async_job_poll_returns_error_on_task_failure():
    """GET /jobs/{id} surfaces the error message when the task fails."""
    from unittest.mock import MagicMock
    from celery.result import AsyncResult

    mock_result = MagicMock(spec=AsyncResult)
    mock_result.state          = "FAILURE"
    mock_result.ready.return_value  = True
    mock_result.failed.return_value = True
    mock_result.result         = Exception("LLM circuit breaker is OPEN")

    with (
        patch("app.api.routes.AsyncResult", return_value=mock_result),
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        response = client.get("/api/v1/jobs/test-job-id-001")

    assert response.status_code in (200, 500)
    data = response.json()
    assert data.get("status") in ("failure", "FAILURE", "error") or "error" in data


def test_async_job_full_poll_cycle_with_eager_execution(mock_pipeline, fake_repo):
    """
    Full end-to-end cycle with CELERY_TASK_ALWAYS_EAGER=True:
    submit → task runs synchronously → poll → assert complete report.

    This is the closest we get to a true E2E test without a live Redis.
    """
    with (
        mock_pipeline["clone"],
        mock_pipeline["delete"],
        mock_pipeline["sha"],
        mock_pipeline["llm"],
        mock_pipeline["llm_review"],
        mock_pipeline["llm_test"],
        mock_pipeline["llm_report"],
        mock_pipeline["dep_scan"],
        mock_pipeline["settings"],
        patch("app.core.config.get_settings") as mock_cfg,
    ):
        # Force eager execution so the task completes inline
        settings_obj = MagicMock()
        settings_obj.celery_task_always_eager = True
        settings_obj.redis_url                = "redis://localhost:6379/0"
        settings_obj.celery_result_backend    = "redis://localhost:6379/1"
        settings_obj.api_key                  = ""
        mock_cfg.return_value = settings_obj

        submit_resp = client.post(
            "/api/v1/analyze/async",
            json={"github_url": VALID_URL},
        )

    assert submit_resp.status_code == 202
    job_id = submit_resp.json().get("job_id")
    assert job_id, "Expected a job_id in the async submit response"

    # Poll — with eager execution the result is available immediately
    with (
        patch("app.api.dependencies.get_settings", return_value=MagicMock(api_key="")),
    ):
        poll_resp = client.get(f"/api/v1/jobs/{job_id}")

    assert poll_resp.status_code == 200
    poll_data = poll_resp.json()

    # Accept any terminal status label the route layer uses
    terminal_statuses = {"success", "SUCCESS", "completed", "failure", "FAILURE"}
    assert poll_data.get("status") in terminal_statuses or "result" in poll_data, (
        f"Expected terminal status or result in poll response, got: {poll_data}"
    )