import pytest
import os
import sys
import subprocess
import time
import threading
import requests
import urllib.parse
import http.server
import socketserver

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))


TEST_VIDEO_DIR = "/tmp/yt-dlp-test-video"
TEST_VIDEO_M3U8 = f"{TEST_VIDEO_DIR}/index.m3u8"
SERVER_PORT = 5005
TEST_HTTP_PORT = 8890


def print_hex(data, max_len=200):
    """Print data as hex for debugging."""
    if isinstance(data, bytes):
        print(f"[HEX] {data[:max_len].hex()}")
    else:
        print(f"[HEX] {data[:max_len].encode().hex()}")


def print_headers(headers):
    """Print response headers."""
    print(f"[HEADERS] {dict(headers)}")


def generate_test_video():
    """Generate test HLS video using ffmpeg."""
    print(f"\n[SETUP] Generating test video in {TEST_VIDEO_DIR}")
    os.makedirs(TEST_VIDEO_DIR, exist_ok=True)
    
    cmd = [
        "ffmpeg", "-y",
        "-f", "lavfi", "-i", "testsrc=duration=10:size=320x240:rate=24",
        "-f", "lavfi", "-i", "sine=frequency=440:duration=10",
        "-c:v", "libx264", "-c:a", "aac", "-strict", "experimental",
        "-hls_time", "2", "-hls_list_size", "0",
        "-hls_segment_filename", f"{TEST_VIDEO_DIR}/segment%03d.ts",
        TEST_VIDEO_M3U8
    ]
    result = subprocess.run(cmd, capture_output=True, text=True, timeout=60)
    if result.returncode != 0:
        print(f"[ERROR] ffmpeg failed: {result.stderr}")
    segments = [f for f in os.listdir(TEST_VIDEO_DIR) if f.endswith(".ts")]
    print(f"[SETUP] Generated {len(segments)} segments")
    return result.returncode == 0 and len(segments) > 0


class QuietHTTPHandler(http.server.SimpleHTTPRequestHandler):
    def log_message(self, format, *args):
        print(f"[HTTP] {self.address_string()} - {format % args}")


class ReusableTCPServer(socketserver.TCPServer):
    allow_reuse_address = True


def serve_test_video():
    print(f"[SETUP] Starting test HTTP server on port {TEST_HTTP_PORT}")
    os.chdir(TEST_VIDEO_DIR)
    with ReusableTCPServer(("127.0.0.1", TEST_HTTP_PORT), QuietHTTPHandler) as httpd:
        httpd.serve_forever()


def start_flask_app():
    print(f"[SETUP] Starting Flask server on port {SERVER_PORT}")
    import app as flask_app
    flask_app.app.run(host="127.0.0.1", port=SERVER_PORT, debug=False, use_reloader=False)


@pytest.fixture(scope="module")
def test_servers():
    print("\n" + "="*60)
    print("INTEGRATION TEST SETUP")
    print("="*60)
    
    generate_test_video()
    
    http_thread = threading.Thread(target=serve_test_video, daemon=True)
    http_thread.start()
    time.sleep(1)
    
    for _ in range(10):
        try:
            requests.get(f"http://127.0.0.1:{TEST_HTTP_PORT}/", timeout=1)
            break
        except:
            time.sleep(0.5)
    print("[SETUP] Test HTTP server ready")
    
    flask_thread = threading.Thread(target=start_flask_app, daemon=True)
    flask_thread.start()
    time.sleep(2)
    
    for _ in range(10):
        try:
            requests.get(f"http://127.0.0.1:{SERVER_PORT}/", timeout=1)
            break
        except:
            time.sleep(0.5)
    print("[SETUP] Flask server ready")
    print("="*60 + "\n")
    
    yield
    
    print("\n[TEARDOWN] Tests complete")


# ============================================================================
# Test URL parsing - critical function
# ============================================================================

class TestURLParsing:
    """Test URL parsing functions as per AGENTS.md."""
    
    def test_url_validation_youtube(self):
        """Test YouTube URL validation."""
        from utils import is_valid_url
        url = "https://www.youtube.com/watch?v=abc123"
        print(f"[TEST] Validating: {url}")
        result = is_valid_url(url)
        print(f"[TEST] Result: {result}")
        assert result is True, f"YouTube URL should be valid: {url}"
    
    def test_url_validation_pornhub(self):
        """Test PornHub URL validation."""
        from utils import is_valid_url
        url = "https://rt.pornhub.com/view_video.php?viewkey=abc123"
        print(f"[TEST] Validating: {url}")
        result = is_valid_url(url)
        print(f"[TEST] Result: {result}")
        assert result is True, f"PornHub URL should be valid: {url}"
    
    def test_url_validation_invalid(self):
        """Test invalid URL rejection."""
        from utils import is_valid_url
        url = "not-a-url"
        print(f"[TEST] Validating: {url}")
        result = is_valid_url(url)
        print(f"[TEST] Result: {result}")
        assert result is False, f"Invalid URL should be rejected: {url}"
    
    def test_url_validation_disallowed(self):
        """Test disallowed domain rejection."""
        from utils import is_valid_url
        url = "https://evil.com/video"
        print(f"[TEST] Validating: {url}")
        result = is_valid_url(url)
        print(f"[TEST] Result: {result}")
        assert result is False, f"Disallowed domain should be rejected: {url}"


# ============================================================================
# Test caching - critical function  
# ============================================================================

class TestCaching:
    """Test caching mechanics as per AGENTS.md."""
    
    def test_cache_store_and_retrieve(self):
        """Test cache can store and retrieve data."""
        import dlp
        dlp._session_cache.clear()
        dlp._cache_timestamps.clear()
        
        url = "https://test.com/video"
        data = {"title": "Test", "hls_url": "http://example.com/playlist.m3u8"}
        
        print(f"[TEST] Storing in cache: {url}")
        dlp._session_cache[url] = data
        dlp._cache_timestamps[url] = time.time()
        
        print(f"[TEST] Cache contents: {dlp._session_cache}")
        assert url in dlp._session_cache
        assert dlp._session_cache[url]["title"] == "Test"
    
    def test_cache_hit_detection(self):
        """Test cache hit is detected."""
        import dlp
        dlp._session_cache.clear()
        dlp._cache_timestamps.clear()
        
        url = "https://test.com/video"
        dlp._session_cache[url] = {"title": "Test"}
        dlp._cache_timestamps[url] = time.time()
        
        print(f"[TEST] Checking cache for: {url}")
        if url in dlp._session_cache:
            print(f"[TEST] Cache HIT!")
        else:
            print(f"[TEST] Cache MISS!")


# ============================================================================
# Test playlist proxying - critical function
# ============================================================================

class TestPlaylistProxying:
    """Test playlist proxying as per AGENTS.md."""
    
    def test_main_playlist_returns_valid_hls(self, test_servers):
        """Test main playlist returns valid HLS content."""
        video_url = f"http://127.0.0.1:{TEST_HTTP_PORT}/index.m3u8"
        encoded = urllib.parse.quote(video_url, safe="")
        proxy_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded}--index.m3u8"
        
        print(f"[TEST] Requesting main playlist: {proxy_url}")
        response = requests.get(proxy_url, timeout=10)
        
        print(f"[TEST] Status: {response.status_code}")
        print_headers(response.headers)
        print(f"[TEST] Content preview: {response.text[:200]}")
        
        assert response.status_code == 200, f"Expected 200, got {response.status_code}"
        assert "#EXTM3U" in response.text, "Should contain #EXTM3U"
        assert ".ts" in response.text, "Should contain segment references"
        print("[TEST] Main playlist returns valid HLS: PASS")
    
    def test_playlist_contains_proxy_urls(self, test_servers):
        """Test playlist URLs are rewritten to proxy."""
        video_url = f"http://127.0.0.1:{TEST_HTTP_PORT}/index.m3u8"
        encoded = urllib.parse.quote(video_url, safe="")
        proxy_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded}--index.m3u8"
        
        print(f"[TEST] Requesting playlist: {proxy_url}")
        response = requests.get(proxy_url, timeout=10)
        
        print(f"[TEST] Content: {response.text}")
        assert "/hls/" in response.text, "Playlist should contain proxy URLs"
        print("[TEST] Playlist contains proxy URLs: PASS")
    
    def test_playlist_content_type_correct(self, test_servers):
        """Test playlist returns correct content-type."""
        video_url = f"http://127.0.0.1:{TEST_HTTP_PORT}/index.m3u8"
        encoded = urllib.parse.quote(video_url, safe="")
        proxy_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded}--index.m3u8"
        
        print(f"[TEST] Requesting: {proxy_url}")
        response = requests.get(proxy_url, timeout=10)
        
        print(f"[TEST] Content-Type: {response.headers.get('Content-Type')}")
        assert "application/vnd.apple.mpegurl" in response.headers.get("Content-Type", "")
        assert "video/mp2t" not in response.headers.get("Content-Type", "")
        print("[TEST] Playlist content-type correct: PASS")


# ============================================================================
# Test segment proxying - critical function
# ============================================================================

class TestSegmentProxying:
    """Test segment proxying as per AGENTS.md."""
    
    def test_segment_returns_video_data(self, test_servers):
        """Test segment returns video data."""
        video_url = f"http://127.0.0.1:{TEST_HTTP_PORT}/index.m3u8"
        encoded = urllib.parse.quote(video_url, safe="")
        playlist_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded}--index.m3u8"
        
        print(f"[TEST] Getting main playlist: {playlist_url}")
        playlist_resp = requests.get(playlist_url, timeout=10)
        
        # Find segment filename
        segment_filename = None
        for line in playlist_resp.text.split("\n"):
            if line.startswith("/hls/") and "--" in line and ".ts" in line:
                parts = line.rsplit("--", 1)
                if len(parts) >= 2:
                    segment_filename = parts[-1]
                    print(f"[TEST] Found segment: {segment_filename}")
                    break
        
        assert segment_filename is not None, "Should find segment in playlist"
        
        seg_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded}--{segment_filename}"
        print(f"[TEST] Requesting segment: {seg_url}")
        
        seg_resp = requests.get(seg_url, timeout=10)
        
        print(f"[TEST] Segment status: {seg_resp.status_code}")
        print_headers(seg_resp.headers)
        print(f"[TEST] Segment size: {len(seg_resp.content)} bytes")
        
        assert seg_resp.status_code == 200
        assert "video/mp2t" in seg_resp.headers.get("Content-Type", "")
        assert len(seg_resp.content) > 1000, "Segment should have substantial data"
        assert b"#EXTM3U" not in seg_resp.content[:100], "Segment should NOT be a playlist"
        
        print("[TEST] Segment returns video data: PASS")


# ============================================================================
# Test error handling - critical function
# ============================================================================

class TestErrorHandling:
    """Test error handling as per AGENTS.md."""
    
    def test_player_missing_url_returns_400(self):
        """Test player route with missing URL returns 400."""
        from app import app
        with app.test_client() as client:
            print("[TEST] Testing /player with no URL")
            response = client.get("/player")
            print(f"[TEST] Status: {response.status_code}")
            assert response.status_code == 400
    
    def test_player_invalid_url_returns_400(self):
        """Test player route with invalid URL returns 400."""
        from app import app
        with app.test_client() as client:
            print("[TEST] Testing /player with invalid URL")
            response = client.get("/player?url=not-valid")
            print(f"[TEST] Status: {response.status_code}")
            assert response.status_code == 400
    
    def test_hls_invalid_video_url_returns_400(self):
        """Test HLS route with invalid video URL returns 400."""
        from app import app
        with app.test_client() as client:
            print("[TEST] Testing /hls with invalid video URL")
            response = client.get("/hls/evil.com--index.m3u8")
            print(f"[TEST] Status: {response.status_code}")
            assert response.status_code == 400


# ============================================================================
# Integration tests - main application flow as per AGENTS.md
# ============================================================================

class TestIntegration:
    """Integration tests for main application flow as per AGENTS.md."""
    
    def test_pornhub_video_full_flow(self):
        """Test PornHub video with full debug output."""
        import dlp
        dlp._session_cache.clear()
        dlp._cache_timestamps.clear()
        
        video_url = "https://rt.pornhub.com/view_video.php?viewkey=69c13273df690"
        
        print(f"\n[TEST] PornHub video: {video_url}")
        
        # Get stream info
        info = dlp.get_stream_info(video_url)
        print(f"[TEST] Title: {info.get('title', 'N/A')[:50]}")
        print(f"[TEST] HLS URL: {info.get('hls_url', 'N/A')[:80] if info.get('hls_url') else 'N/A'}")
        
        # Get playlist
        playlist = dlp.get_hls_playlist(video_url)
        print(f"[TEST] Playlist content (first 300 chars): {playlist[:300]}")
        print_hex(playlist[:100])
        
        assert "#EXTM3U" in playlist
        assert "/hls/" in playlist
        print("[TEST] PornHub full flow: PASS")
    
    def test_youtube_video_fallback(self):
        """Test YouTube uses direct URL fallback."""
        import dlp
        dlp._session_cache.clear()
        dlp._cache_timestamps.clear()
        
        video_url = "https://www.youtube.com/watch?v=PoV9fS4CnaY"
        
        print(f"\n[TEST] YouTube video: {video_url}")
        
        info = dlp.get_stream_info(video_url)
        print(f"[TEST] Title: {info.get('title', 'N/A')[:50]}")
        print(f"[TEST] Direct URL: {info.get('direct_url', 'N/A')[:80] if info.get('direct_url') else 'N/A'}")
        
        assert "title" in info
        print("[TEST] YouTube fallback: PASS")
    
    def test_yt_dlp_consumes_proxy_playlist(self):
        """Test yt-dlp can consume proxy playlist like browser."""
        import dlp
        dlp._session_cache.clear()
        dlp._cache_timestamps.clear()
        
        video_url = "https://rt.pornhub.com/view_video.php?viewkey=69c13273df690"
        encoded_url = urllib.parse.quote(video_url, safe="")
        playlist_url = f"http://127.0.0.1:{SERVER_PORT}/hls/{encoded_url}--index.m3u8"
        
        print(f"\n[TEST] yt-dlp proxy URL: {playlist_url}")
        
        cmd = [
            "yt-dlp",
            "--hls-use-mpegts",
            "--no-download",
            "--print", "url",
            playlist_url
        ]
        
        print(f"[TEST] Running: {' '.join(cmd)}")
        result = subprocess.run(cmd, capture_output=True, text=True, timeout=60)
        
        print(f"[TEST] yt-dlp return code: {result.returncode}")
        if result.stdout:
            print(f"[TEST] yt-dlp output: {result.stdout[:200]}")
        if result.returncode != 0:
            print(f"[TEST] yt-dlp stderr: {result.stderr[:500]}")
        
        assert result.returncode == 0, f"yt-dlp failed: {result.stderr}"
        print("[TEST] yt-dlp consumes proxy playlist: PASS")


if __name__ == "__main__":
    pytest.main([__file__, "-v", "-s"])