#!/usr/bin/env python3
"""
Test PaddleOCR in dynamic graph mode (not inference mode).

Dynamic mode compiles kernels at runtime, which may work on Blackwell.
Inference mode uses pre-compiled kernels which fail on sm_121.

Usage:
    python test_dynamic_mode.py [image_path]
"""

import os
import sys

os.environ['DISABLE_MODEL_SOURCE_CHECK'] = 'True'
# Force dynamic graph mode
os.environ['FLAGS_enable_pir_api'] = '0'

import numpy as np
import paddle
from PIL import Image


def check_gpu():
    """Check GPU status."""
    print("=" * 60)
    print("GPU STATUS")
    print("=" * 60)
    print(f"Device: {paddle.device.get_device()}")
    print(f"CUDA compiled: {paddle.device.is_compiled_with_cuda()}")

    if paddle.device.is_compiled_with_cuda() and paddle.device.cuda.device_count() > 0:
        props = paddle.device.cuda.get_device_properties(0)
        print(f"GPU: {props.name} (sm_{props.major}{props.minor})")
        print(f"Memory: {props.total_memory / (1024**3):.1f} GB")
    print()


def test_paddleocr_dynamic(image_path: str):
    """Test PaddleOCR with dynamic execution."""
    print("=" * 60)
    print("PADDLEOCR DYNAMIC MODE TEST")
    print("=" * 60)

    # Import PaddleOCR
    from paddleocr import PaddleOCR

    # Try to force dynamic mode by setting use_static=False if available
    # or by using the model in eval mode directly

    print("Creating PaddleOCR instance...")
    print("(This may download models on first run)")

    try:
        # Create OCR instance - this might still use inference internally
        ocr = PaddleOCR(
            text_detection_model_name='PP-OCRv4_mobile_det',
            text_recognition_model_name='PP-OCRv4_mobile_rec',
            use_angle_cls=False,  # Simplify
            lang='es',
        )

        # Load image
        img = Image.open(image_path)
        arr = np.array(img)
        print(f"Image shape: {arr.shape}")

        # Run prediction
        print("Running OCR prediction...")
        result = ocr.predict(arr)

        # Parse results
        res = result[0].json['res']
        dt_polys = res.get('dt_polys', [])
        rec_texts = res.get('rec_texts', [])

        print()
        print("RESULTS:")
        print(f"  Detected boxes: {len(dt_polys)}")
        print(f"  Recognized texts: {len(rec_texts)}")

        if rec_texts:
            print(f"  First 5 texts: {rec_texts[:5]}")
            return True
        else:
            print("  WARNING: No text recognized!")
            return False

    except Exception as e:
        print(f"ERROR: {e}")
        return False


def test_paddle_dynamic_model():
    """Test loading a paddle model in dynamic graph mode."""
    print()
    print("=" * 60)
    print("PADDLE DYNAMIC GRAPH TEST")
    print("=" * 60)

    # Ensure we're in dynamic mode
    paddle.disable_static()

    # Test a simple model forward pass
    print("Testing dynamic graph execution...")

    # Create a simple ResNet-like block
    x = paddle.randn([1, 3, 224, 224])

    # Conv -> BN -> ReLU
    conv = paddle.nn.Conv2D(3, 64, 7, stride=2, padding=3)
    bn = paddle.nn.BatchNorm2D(64)

    # Forward pass (dynamic mode - compiles at runtime)
    y = conv(x)
    y = bn(y)
    y = paddle.nn.functional.relu(y)

    print(f"Input shape: {x.shape}")
    print(f"Output shape: {y.shape}")
    print(f"Output min: {y.min().item():.4f}")
    print(f"Output max: {y.max().item():.4f}")
    print(f"Output mean: {y.mean().item():.4f}")

    if y.min() != y.max():
        print("Dynamic graph mode: WORKING")
        return True
    else:
        print("Dynamic graph mode: BROKEN (constant output)")
        return False


def test_ppocr_model_direct():
    """Try loading PPOCRv4 model directly in dynamic mode."""
    print()
    print("=" * 60)
    print("PPOCR MODEL DIRECT LOAD TEST")
    print("=" * 60)

    try:
        # Try to import ppocr modules directly
        # This bypasses the inference predictor
        from paddleocr.ppocr.modeling.architectures import build_model
        from paddleocr.ppocr.postprocess import build_post_process
        from paddleocr.ppocr.utils.save_load import load_model

        print("Direct model import available")

        # Note: This approach requires model config files
        # which may or may not be bundled with paddleocr

    except ImportError as e:
        print(f"Direct model import not available: {e}")
        print("PaddleOCR may only support inference mode")

    return False


def main():
    # Default test image
    image_path = '/app/dataset/0/img/page_0001.png'
    if len(sys.argv) > 1:
        image_path = sys.argv[1]

    if not os.path.exists(image_path):
        print(f"Image not found: {image_path}")
        sys.exit(1)

    print(f"Testing with image: {image_path}")
    print()

    check_gpu()

    # Test 1: Basic dynamic graph
    dynamic_works = test_paddle_dynamic_model()

    if not dynamic_works:
        print("\nDynamic graph mode is broken - GPU likely unsupported")
        sys.exit(1)

    # Test 2: Direct model load
    test_ppocr_model_direct()

    # Test 3: PaddleOCR pipeline
    ocr_works = test_paddleocr_dynamic(image_path)

    print()
    print("=" * 60)
    print("SUMMARY")
    print("=" * 60)
    print(f"Dynamic graph mode: {'WORKS' if dynamic_works else 'BROKEN'}")
    print(f"PaddleOCR pipeline: {'WORKS' if ocr_works else 'BROKEN'}")

    if dynamic_works and not ocr_works:
        print()
        print("DIAGNOSIS: Dynamic mode works but PaddleOCR fails.")
        print("This means PaddleOCR internally uses inference predictor")
        print("which has pre-compiled kernels without Blackwell support.")
        print()
        print("Potential solutions:")
        print("1. Modify PaddleOCR to use dynamic mode")
        print("2. Use ONNX export + ONNXRuntime")
        print("3. Wait for PaddlePaddle Blackwell support")


if __name__ == '__main__':
    main()