"""
Test script for FoundationPose HuggingFace API.

This test verifies that the API can:
1. Initialize an object with CAD model (T-shape mesh)
2. Estimate pose from query images
"""

import sys
from pathlib import Path
import numpy as np
import cv2
from gradio_client import Client, handle_file

# Add parent directory to path to import client
sys.path.insert(0, str(Path(__file__).parent.parent))

from client import FoundationPoseClient


def load_test_data(reference_dir: Path):
    """Load RGB and depth test images from t_shape directory."""
    rgb_path = reference_dir / "rgb_001.jpg"
    depth_path = reference_dir / "depth_001.png"

    # Load RGB image
    print(f"Loading RGB: {rgb_path}")
    rgb = cv2.imread(str(rgb_path))
    if rgb is None:
        raise FileNotFoundError(f"Could not load RGB image: {rgb_path}")
    rgb = cv2.cvtColor(rgb, cv2.COLOR_BGR2RGB)

    # Load depth image (16-bit PNG)
    print(f"Loading depth: {depth_path}")
    depth = cv2.imread(str(depth_path), cv2.IMREAD_ANYDEPTH)
    if depth is None:
        raise FileNotFoundError(f"Could not load depth image: {depth_path}")

    # Check if depth needs resizing to match RGB
    if depth.shape[:2] != rgb.shape[:2]:
        print(f"⚠ Warning: Depth ({depth.shape[:2]}) and RGB ({rgb.shape[:2]}) sizes don't match")
        print(f"  Resizing depth to match RGB...")
        depth = cv2.resize(depth, (rgb.shape[1], rgb.shape[0]), interpolation=cv2.INTER_NEAREST)

    # Convert depth to meters (assuming it's in mm or similar)
    # Depth should be float32 in meters for FoundationPose
    depth = depth.astype(np.float32) / 1000.0  # Convert mm to meters

    print(f"✓ RGB loaded: shape={rgb.shape}, dtype={rgb.dtype}")
    print(f"✓ Depth loaded: shape={depth.shape}, dtype={depth.dtype}, range=[{depth.min():.3f}, {depth.max():.3f}]m")

    return rgb, depth


def test_client_initialization():
    """Test that API client initializes without errors."""
    print("=" * 60)
    print("Test 1: API Client Initialization")
    print("=" * 60)

    try:
        client = FoundationPoseClient(api_url="https://gpue-foundationpose.hf.space")
        print("✓ API client initialized successfully")
        return client
    except Exception as e:
        print(f"✗ API client initialization failed: {e}")
        return None


def test_cad_initialization(client, mesh_path):
    """Test CAD-based object initialization via API."""
    print("\n" + "=" * 60)
    print("Test 2: CAD-Based Initialization via API")
    print("=" * 60)
    print(f"Mesh file: {mesh_path.name}")

    # Define camera intrinsics matching the actual image size (240x160)
    # Principal point (cx, cy) should be at image center
    # Focal lengths estimated assuming ~60° FOV
    camera_intrinsics = {
        "fx": 200.0,  # Focal length adjusted for 240px width
        "fy": 200.0,  # Focal length adjusted for 160px height
        "cx": 120.0,  # Image center x (240/2)
        "cy": 80.0    # Image center y (160/2)
    }

    try:
        # Extract intrinsics
        fx = camera_intrinsics.get("fx", 600.0)
        fy = camera_intrinsics.get("fy", 600.0)
        cx = camera_intrinsics.get("cx", 320.0)
        cy = camera_intrinsics.get("cy", 240.0)

        # Call CAD-based initialization endpoint directly
        result = client.client.predict(
            object_id="t_shape",
            mesh_file=handle_file(str(mesh_path)),
            reference_files=[],  # No reference images needed for CAD mode
            fx=fx,
            fy=fy,
            cx=cx,
            cy=cy,
            api_name="/gradio_initialize_cad"
        )

        print(f"API result: {result}")

        if isinstance(result, str) and ("✓" in result or "initialized" in result.lower()):
            print("✓ Object initialized successfully with CAD model")
            return True
        elif isinstance(result, str) and ("Error" in result or "error" in result):
            print(f"✗ Object initialization failed: {result}")
            return False
        else:
            print("✓ Object initialized (assuming success)")
            return True

    except Exception as e:
        print(f"✗ Object initialization failed with exception: {e}")
        import traceback
        traceback.print_exc()
        return False


def test_pose_estimation(client, query_image, depth_image, query_name):
    """Test pose estimation on a query image via API with depth and mask verification."""
    print("\n" + "=" * 60)
    print("Test 3: Pose Estimation via API (with Depth & Mask)")
    print("=" * 60)
    print(f"Query image: {query_name}")

    # Define camera intrinsics (must match initialization and actual image size)
    camera_intrinsics = {
        "fx": 200.0,  # Focal length for 240px width
        "fy": 200.0,  # Focal length for 160px height
        "cx": 120.0,  # Image center x (240/2)
        "cy": 80.0    # Image center y (160/2)
    }

    try:
        # Save images to temp files for API upload
        import tempfile
        rgb_temp = tempfile.NamedTemporaryFile(delete=False, suffix=".jpg")
        depth_temp = tempfile.NamedTemporaryFile(delete=False, suffix=".png")

        # Save RGB as JPEG
        rgb_bgr = cv2.cvtColor(query_image, cv2.COLOR_RGB2BGR)
        cv2.imwrite(rgb_temp.name, rgb_bgr, [cv2.IMWRITE_JPEG_QUALITY, 95])

        # Save depth as 16-bit PNG (convert back from meters to mm)
        depth_uint16 = (depth_image * 1000.0).astype(np.uint16)
        cv2.imwrite(depth_temp.name, depth_uint16)

        print(f"Calling API with RGB + Depth images...")

        # Call Gradio API directly to get all outputs (text, viz, mask)
        result = client.client.predict(
            object_id="t_shape",
            query_image=handle_file(rgb_temp.name),
            depth_image=handle_file(depth_temp.name),
            fx=camera_intrinsics["fx"],
            fy=camera_intrinsics["fy"],
            cx=camera_intrinsics["cx"],
            cy=camera_intrinsics["cy"],
            api_name="/gradio_estimate"
        )

        # Clean up temp files
        from pathlib import Path
        Path(rgb_temp.name).unlink()
        Path(depth_temp.name).unlink()

        # Result should be tuple: (text_output, viz_image, mask_image)
        if not isinstance(result, tuple) or len(result) != 3:
            print(f"✗ Unexpected result format: {type(result)}, length={len(result) if isinstance(result, tuple) else 'N/A'}")
            return False

        text_output, viz_image, mask_image = result

        print(f"\n✓ API returned 3 outputs as expected")
        print(f"  - Text output: {len(text_output)} chars")
        print(f"  - Viz image: {viz_image.shape if viz_image is not None else 'None'}")
        print(f"  - Mask image: {mask_image.shape if mask_image is not None else 'None'}")

        # Verify mask was generated
        if mask_image is None:
            print(f"✗ Mask was not returned (expected auto-generated mask)")
            return False

        print(f"✓ Mask returned: shape={mask_image.shape}, dtype={mask_image.dtype}")

        # Check text output for success/failure
        if "Error" in text_output or "✗" in text_output:
            print(f"✗ Estimation failed: {text_output[:200]}")
            return False

        # Check if poses were detected
        if "No poses detected" in text_output or "⚠" in text_output:
            print(f"⚠ No poses detected (API working, but no objects found)")
            print(f"Output: {text_output[:300]}")
            return False

        # Success - parse output
        print(f"✓ Pose estimation succeeded!")
        print(f"\nEstimation output:")
        print(text_output)

        return True

    except Exception as e:
        print(f"✗ Pose estimation failed with exception: {e}")
        import traceback
        traceback.print_exc()
        return False


def main():
    """Run all tests."""
    print("\n" + "=" * 60)
    print("FoundationPose CAD-Based API Test Suite")
    print("=" * 60)

    # Setup paths
    test_dir = Path(__file__).parent
    mesh_path = test_dir / "reference" / "t_shape" / "t_shape.obj"
    reference_dir = test_dir / "reference" / "t_shape"

    # Check if mesh file exists
    if not mesh_path.exists():
        print(f"✗ Mesh file not found: {mesh_path}")
        return

    # Check if reference images exist (for query testing)
    if not reference_dir.exists():
        print(f"✗ Reference directory not found: {reference_dir}")
        return

    print(f"\nUsing T-shape mesh: {mesh_path}")
    print(f"Using test data from: {reference_dir}")

    # Load test RGB and depth images
    try:
        rgb_image, depth_image = load_test_data(reference_dir)
    except FileNotFoundError as e:
        print(f"✗ {e}")
        return

    print(f"\n✓ Loaded RGB and depth images - testing with both")

    # Test 1: Initialize API client
    client = test_client_initialization()
    if client is None:
        print("\n" + "=" * 60)
        print("TESTS ABORTED: API client initialization failed")
        print("=" * 60)
        return

    # Test 2: Initialize object with CAD model
    success = test_cad_initialization(client, mesh_path)
    if not success:
        print("\n" + "=" * 60)
        print("TESTS ABORTED: CAD initialization failed")
        print("=" * 60)
        return

    # Test 3: Estimate pose using RGB + depth images
    success = test_pose_estimation(client, rgb_image, depth_image, "rgb_001.jpg")

    # Print final results
    print("\n" + "=" * 60)
    print("TEST SUMMARY")
    print("=" * 60)
    print("✓ API client initialization: PASSED")
    print("✓ CAD-based object initialization: PASSED")
    if success:
        print("✓ Pose estimation with RGB+depth: PASSED")
        print("✓ Mask generation verification: PASSED")
        print("\n🎉 ALL TESTS PASSED")
    else:
        print("⚠ Pose estimation: Issues detected (see output above)")
        print("\n📊 API TESTS PARTIALLY PASSED (2/3 core functions verified)")
        print("\nPossible reasons for no detections:")
        print("  - Camera intrinsics mismatch")
        print("  - Object not visible or occluded in image")
        print("  - Depth data quality issues")
        print("  - Mask segmentation inaccurate")
    print("=" * 60)


if __name__ == "__main__":
    main()