"""Integration tests for every API endpoint a real user hits.

All tests use mocked Redis and mocked LLM — no external services required.
"""
from __future__ import annotations

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

import pytest

from tests.conftest import (
    MINIMAL_PDF_BYTES,
    SAMPLE_RESUME,
    SAMPLE_RESUME_JSON,
    make_resume_data,
    make_result_data,
)


# =========================================================================
# Health
# =========================================================================

class TestHealth:
    def test_health_returns_ok(self, client):
        response = client.get("/health")
        assert response.status_code == 200
        assert response.json() == {"status": "ok"}


# =========================================================================
# Upload  (POST /api/upload)
# =========================================================================

class TestUpload:
    def test_valid_pdf_upload(self, client, mock_redis):
        """Valid PDF → 200 with session_id and profile."""
        mock_parser = MagicMock()
        mock_parser.is_supported.return_value = True
        mock_parser.parse = AsyncMock(return_value=SAMPLE_RESUME)

        mock_scanner = MagicMock()
        mock_scanner.scan.return_value = MagicMock(has_issues=False, warnings=[])

        with patch("app.api.routes.upload.ResumeParser", return_value=mock_parser), \
             patch("app.api.routes.upload.LayoutScanner", return_value=mock_scanner):
            response = client.post(
                "/api/upload",
                files={"file": ("resume.pdf", MINIMAL_PDF_BYTES, "application/pdf")},
            )

        assert response.status_code == 200
        body = response.json()
        assert "session_id" in body
        assert body["profile"]["name"] == "Jane Doe"
        assert len(body["profile"]["skills"]) <= 10
        assert "experience_count" in body["profile"]

    def test_valid_docx_upload(self, client, mock_redis):
        """DOCX files are accepted."""
        mock_parser = MagicMock()
        mock_parser.is_supported.return_value = True
        mock_parser.parse = AsyncMock(return_value=SAMPLE_RESUME)

        mock_scanner = MagicMock()
        mock_scanner.scan.return_value = MagicMock(has_issues=False, warnings=[])

        with patch("app.api.routes.upload.ResumeParser", return_value=mock_parser), \
             patch("app.api.routes.upload.LayoutScanner", return_value=mock_scanner):
            response = client.post(
                "/api/upload",
                files={
                    "file": (
                        "resume.docx",
                        b"fake-docx-bytes",
                        "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
                    )
                },
            )

        assert response.status_code == 200
        assert "session_id" in response.json()

    def test_invalid_file_type_txt(self, client):
        """Plain text file → 400."""
        response = client.post(
            "/api/upload",
            files={"file": ("notes.txt", b"hello world", "text/plain")},
        )
        assert response.status_code == 400
        assert "Invalid file type" in response.json()["detail"]

    def test_invalid_file_type_jpg(self, client):
        """Image file → 400."""
        response = client.post(
            "/api/upload",
            files={"file": ("photo.jpg", b"\xff\xd8\xff", "image/jpeg")},
        )
        assert response.status_code == 400

    def test_file_too_large(self, client):
        """File > 5 MB → 400."""
        mock_parser = MagicMock()
        mock_parser.is_supported.return_value = True

        with patch("app.api.routes.upload.ResumeParser", return_value=mock_parser):
            big_content = b"x" * (5 * 1024 * 1024 + 1)
            response = client.post(
                "/api/upload",
                files={"file": ("big.pdf", big_content, "application/pdf")},
            )

        assert response.status_code == 400
        assert "too large" in response.json()["detail"].lower()

    def test_no_cookie_in_response(self, client, mock_redis):
        """Upload response must NOT set cookies (we use X-Session-ID header)."""
        mock_parser = MagicMock()
        mock_parser.is_supported.return_value = True
        mock_parser.parse = AsyncMock(return_value=SAMPLE_RESUME)

        mock_scanner = MagicMock()
        mock_scanner.scan.return_value = MagicMock(has_issues=False, warnings=[])

        with patch("app.api.routes.upload.ResumeParser", return_value=mock_parser), \
             patch("app.api.routes.upload.LayoutScanner", return_value=mock_scanner):
            response = client.post(
                "/api/upload",
                files={"file": ("resume.pdf", MINIMAL_PDF_BYTES, "application/pdf")},
            )

        assert "set-cookie" not in response.headers


# =========================================================================
# Session via X-Session-ID header
# =========================================================================

class TestSessionHeader:
    def test_valid_session_header(self, client, sample_session):
        """Request with valid X-Session-ID + existing resume → authorized."""
        # Use preview-score as a session-gated endpoint
        with patch("app.api.routes.analyze.JobScraper") as MockScraper, \
             patch("app.api.routes.analyze.ATSScorer") as MockScorer:
            mock_scraper = AsyncMock()
            mock_scraper.parse_text.return_value = MagicMock()
            MockScraper.return_value = mock_scraper

            mock_scorer = AsyncMock()
            mock_scorer.calculate.return_value = MagicMock(
                total=65, matched_keywords=["Python"], missing_keywords=["Go"],
            )
            MockScorer.return_value = mock_scorer

            response = client.post(
                "/api/preview-score",
                headers={"X-Session-ID": sample_session},
                json={"job_text": "Looking for a Python developer"},
            )

        assert response.status_code == 200

    def test_missing_session_header(self, client):
        """No X-Session-ID header → 401."""
        response = client.post(
            "/api/preview-score",
            json={"job_text": "some job"},
        )
        assert response.status_code == 401
        assert "No session" in response.json()["detail"]

    def test_expired_session_header(self, client, mock_redis):
        """X-Session-ID with no matching Redis data → 401."""
        response = client.post(
            "/api/preview-score",
            headers={"X-Session-ID": "nonexistent-session-id"},
            json={"job_text": "some job"},
        )
        assert response.status_code == 401
        assert "expired" in response.json()["detail"].lower()


# =========================================================================
# Preview Score  (POST /api/preview-score)
# =========================================================================

class TestPreviewScore:
    def test_preview_score_with_job_text(self, client, sample_session):
        """Preview score with job text → returns score and keywords."""
        with patch("app.api.routes.analyze.JobScraper") as MockScraper, \
             patch("app.api.routes.analyze.ATSScorer") as MockScorer:
            mock_scraper = AsyncMock()
            mock_scraper.parse_text.return_value = MagicMock()
            MockScraper.return_value = mock_scraper

            mock_scorer = AsyncMock()
            mock_scorer.calculate.return_value = MagicMock(
                total=72,
                matched_keywords=["Python", "FastAPI"],
                missing_keywords=["Kubernetes"],
            )
            MockScorer.return_value = mock_scorer

            response = client.post(
                "/api/preview-score",
                headers={"X-Session-ID": sample_session},
                json={"job_text": "We need a Python developer with FastAPI experience."},
            )

        assert response.status_code == 200
        body = response.json()
        assert "score" in body
        assert body["score"] == 72
        assert "matched_keywords" in body
        assert "missing_keywords" in body

    def test_preview_score_without_session(self, client):
        """Preview score without session → 401."""
        response = client.post(
            "/api/preview-score",
            json={"job_text": "some job"},
        )
        assert response.status_code == 401

    def test_preview_score_low_needs_confirmation(self, client, sample_session):
        """Score below 30 → needs_confirmation = True."""
        with patch("app.api.routes.analyze.JobScraper") as MockScraper, \
             patch("app.api.routes.analyze.ATSScorer") as MockScorer:
            mock_scraper = AsyncMock()
            mock_scraper.parse_text.return_value = MagicMock()
            MockScraper.return_value = mock_scraper

            mock_scorer = AsyncMock()
            mock_scorer.calculate.return_value = MagicMock(
                total=15,
                matched_keywords=[],
                missing_keywords=["Java", "Spring"],
            )
            MockScorer.return_value = mock_scorer

            response = client.post(
                "/api/preview-score",
                headers={"X-Session-ID": sample_session},
                json={"job_text": "Java Spring Boot developer needed."},
            )

        assert response.status_code == 200
        body = response.json()
        assert body["needs_confirmation"] is True


# =========================================================================
# Analyze Job  (POST /api/analyze-job)
# =========================================================================

class TestAnalyzeJob:
    def test_analyze_job_returns_task_id(self, client, sample_session):
        """Analyze with job text + intensity → returns task_id."""
        mock_task = MagicMock()
        mock_task.id = "celery-task-id-123"

        with patch("app.api.routes.analyze.JobScraper") as MockScraper, \
             patch("app.api.routes.analyze.ATSScorer") as MockScorer, \
             patch("app.api.routes.analyze.analyze_and_customize") as mock_celery:
            # Score check passes (above threshold)
            mock_scraper = AsyncMock()
            mock_scraper.parse_text.return_value = MagicMock()
            MockScraper.return_value = mock_scraper

            mock_scorer = AsyncMock()
            mock_scorer.calculate.return_value = MagicMock(total=65)
            MockScorer.return_value = mock_scorer

            mock_celery.delay.return_value = mock_task

            response = client.post(
                "/api/analyze-job",
                headers={"X-Session-ID": sample_session},
                json={
                    "job_text": "Python developer with FastAPI experience",
                    "intensity": "moderate",
                },
            )

        assert response.status_code == 200
        body = response.json()
        assert body["task_id"] == "celery-task-id-123"

    def test_analyze_job_missing_session(self, client):
        """No session → 401."""
        response = client.post(
            "/api/analyze-job",
            json={"job_text": "some job", "intensity": "moderate"},
        )
        assert response.status_code == 401

    def test_analyze_job_low_score_triggers_confirmation(self, client, sample_session):
        """Score below threshold → needs_confirmation response instead of task."""
        with patch("app.api.routes.analyze.JobScraper") as MockScraper, \
             patch("app.api.routes.analyze.ATSScorer") as MockScorer:
            mock_scraper = AsyncMock()
            mock_scraper.parse_text.return_value = MagicMock()
            MockScraper.return_value = mock_scraper

            mock_scorer = AsyncMock()
            mock_scorer.calculate.return_value = MagicMock(total=20)
            MockScorer.return_value = mock_scorer

            response = client.post(
                "/api/analyze-job",
                headers={"X-Session-ID": sample_session},
                json={"job_text": "Java developer", "intensity": "moderate"},
            )

        assert response.status_code == 200
        body = response.json()
        assert body["needs_confirmation"] is True
        assert "task_id" not in body

    def test_analyze_job_missing_job_input(self, client, sample_session):
        """No job_url or job_text → 400."""
        response = client.post(
            "/api/analyze-job",
            headers={"X-Session-ID": sample_session},
            json={"intensity": "moderate"},
        )
        assert response.status_code == 400


# =========================================================================
# Result  (GET /api/result/{id})
# =========================================================================

class TestResult:
    def test_valid_result_id(self, client, sample_result):
        """Valid result_id → returns full result."""
        response = client.get(f"/api/result/{sample_result}")
        assert response.status_code == 200
        body = response.json()
        assert "original" in body
        assert "customized" in body
        assert "original_score" in body
        assert "customized_score" in body

    def test_invalid_result_id(self, client, mock_redis):
        """Non-existent result_id → 404."""
        response = client.get("/api/result/does-not-exist")
        assert response.status_code == 404
        assert "not found" in response.json()["detail"].lower()


# =========================================================================
# Export  (GET /api/export/{id})
# =========================================================================

class TestExport:
    def test_pdf_export(self, client, sample_result):
        """PDF export → returns PDF bytes."""
        with patch("app.api.routes.export.ResumeGenerator") as MockGen:
            mock_gen = MagicMock()
            mock_gen.to_pdf.return_value = b"%PDF-1.4 fake content"
            MockGen.return_value = mock_gen

            response = client.get(f"/api/export/{sample_result}?format=pdf")

        assert response.status_code == 200
        assert response.headers["content-type"] == "application/pdf"
        assert b"PDF" in response.content

    def test_docx_export(self, client, sample_result):
        """DOCX export → returns DOCX bytes."""
        with patch("app.api.routes.export.ResumeGenerator") as MockGen:
            mock_gen = MagicMock()
            mock_gen.to_docx.return_value = b"PK\x03\x04 fake docx"
            MockGen.return_value = mock_gen

            response = client.get(f"/api/export/{sample_result}?format=docx")

        assert response.status_code == 200
        assert "wordprocessingml" in response.headers["content-type"]

    def test_export_invalid_result_id(self, client, mock_redis):
        """Non-existent result_id → 404."""
        response = client.get("/api/export/does-not-exist?format=pdf")
        assert response.status_code == 404


# =========================================================================
# Global Exception Handler
# =========================================================================

class TestGlobalExceptionHandler:
    def test_rate_limit_error_returns_429(self, client):
        """Unhandled rate-limit exception → 429 JSON."""
        import asyncio
        from starlette.testclient import TestClient as _TC
        from app.main import global_exception_handler

        # Call the handler directly with a mock request
        from unittest.mock import MagicMock as _MagicMock
        mock_request = _MagicMock()
        exc = Exception("rate limit exceeded on quota")

        loop = asyncio.new_event_loop()
        try:
            resp = loop.run_until_complete(global_exception_handler(mock_request, exc))
        finally:
            loop.close()

        assert resp.status_code == 429
        import json as _json
        body = _json.loads(resp.body)
        assert body["error_type"] == "rate_limit"

    def test_exhausted_error_returns_503(self, client):
        """Unhandled 'exhausted' exception → 503 JSON."""
        import asyncio
        from app.main import global_exception_handler
        from unittest.mock import MagicMock as _MagicMock

        mock_request = _MagicMock()
        exc = Exception("All providers exhausted")

        loop = asyncio.new_event_loop()
        try:
            resp = loop.run_until_complete(global_exception_handler(mock_request, exc))
        finally:
            loop.close()

        assert resp.status_code == 503

    def test_generic_error_returns_500(self, client):
        """Generic unhandled exception → 500 JSON."""
        import asyncio
        from app.main import global_exception_handler
        from unittest.mock import MagicMock as _MagicMock

        mock_request = _MagicMock()
        exc = Exception("Something unexpected happened")

        loop = asyncio.new_event_loop()
        try:
            resp = loop.run_until_complete(global_exception_handler(mock_request, exc))
        finally:
            loop.close()

        assert resp.status_code == 500

    def test_health_always_returns_json(self, client):
        """Health endpoint always returns well-formed JSON."""
        response = client.get("/health")
        assert response.headers["content-type"] == "application/json"
        response.json()  # Should not raise