import gradio as gr
import requests
import io
import os
from PIL import Image, ImageDraw, ImageFont
from pathlib import Path

API_URL = os.getenv("API_URL")
API_KEY = os.getenv("API_KEY")
IMAGE_FOLDER = "images"
def get_test_images():
    images = []
    if os.path.exists(IMAGE_FOLDER):
        for file in sorted(Path(IMAGE_FOLDER).glob("*")):
            if file.suffix.lower() in [".jpg", ".jpeg", ".png", ".bmp", ".gif"]:
                images.append((str(file), file.name))
    return images

def load_test_image(image_path):
    if image_path and os.path.exists(image_path):
        return Image.open(image_path)
    return None

CLASS_NAMES = {0: "figure"}
CLASS_COLORS = {
    0: (255, 165, 0),
}

def _load_font(font_size):
    font_paths = [
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",
        "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf",
        "/System/Library/Fonts/Arial.ttf",
        "C:\\Windows\\Fonts\\arial.ttf",
        "arial.ttf",
    ]

    for path in font_paths:
        if os.path.exists(path):
            try:
                return ImageFont.truetype(path, font_size)
            except:
                continue

    return ImageFont.load_default()

def draw_boxes_on_image(image, detections):
    if not detections:
        return image

    img_copy = image.copy()
    draw = ImageDraw.Draw(img_copy)
    img_width, img_height = img_copy.size

    min_dimension = min(img_width, img_height)
    font_size = max(int(min_dimension * 0.02), 32)
    line_width = max(int(min_dimension * 0.008), 3)

    label_font = _load_font(font_size)

    for detection in detections:
        confidence = detection.get("confidence", 0)
        class_id = detection.get("class", 0)
        box = detection.get("box", {})

        color = CLASS_COLORS.get(class_id, (255, 165, 0))

        x1 = int(box.get("x1", 0))
        y1 = int(box.get("y1", 0))
        x2 = int(box.get("x2", 0))
        y2 = int(box.get("y2", 0))

        if x1 > 0 and y1 > 0 and x2 > x1 and y2 > y1:
            draw.rectangle([x1, y1, x2, y2], outline=color, width=line_width)

            label = f"Figure {confidence:.1%}"

            bbox = draw.textbbox((0, 0), label, font=label_font)
            text_width = bbox[2] - bbox[0]
            text_height = bbox[3] - bbox[1]

            center_x = (x1 + x2) / 2
            label_x = int(center_x - text_width / 2)
            label_y = max(0, y1 - text_height - 5)

            if label_x < 0:
                label_x = 2
            if label_x + text_width > img_width:
                label_x = img_width - text_width - 2

            bg_padding = 4
            bg_box = [
                label_x - bg_padding,
                label_y - bg_padding,
                label_x + text_width + bg_padding,
                label_y + text_height + bg_padding
            ]
            draw.rectangle(bg_box, outline=color, fill=(0, 0, 0))

            draw.text((label_x, label_y), label, font=label_font, fill=color)

    return img_copy

def predict_image(image, confidence, iou, imgsz):
    if image is None:
        return None, "#### Please upload an image to begin detection"

    try:
        img_bytes = io.BytesIO()
        image.save(img_bytes, format='JPEG')
        img_bytes.seek(0)

        params = {
            "conf": confidence,
            "iou": iou,
            "imgsz": imgsz
        }

        headers = {"Authorization": f"Bearer {API_KEY}"}
        files = {"file": ("image.jpg", img_bytes, "image/jpeg")}

        response = requests.post(API_URL, headers=headers, data=params, files=files, timeout=30)
        response.raise_for_status()

        result = response.json()
        formatted_result = format_results(result)

        detections = []
        if "images" in result and len(result["images"]) > 0:
            detections = result["images"][0].get("results", [])

        image_with_boxes = draw_boxes_on_image(image, detections)

        return image_with_boxes, formatted_result

    except requests.exceptions.Timeout:
        return None, "#### Error: Request timeout. Please try again."
    except requests.exceptions.ConnectionError:
        return None, "#### Error: Unable to connect to detection service. Please check API configuration."
    except requests.exceptions.HTTPError as e:
        return None, f"#### Error: API returned status {e.response.status_code}"
    except Exception as e:
        return None, f"#### Error: {str(e)}"

def format_results(result):
    if isinstance(result, dict):
        output = "## Detection Results\n\n"

        if "images" in result and len(result["images"]) > 0:
            img_data = result["images"][0]
            shape = img_data.get("shape", [])
            detections = img_data.get("results", [])

            output += f"**Image Size:** {shape[0]} x {shape[1]} (W x H)\n"
            output += f"**Detections Found:** {len(detections)}\n\n"

            speed = img_data.get("speed", {})
            if speed:
                output += "\n### Performance Metrics\n"
                output += "| Metric | Time (ms) |\n"
                output += "|--------|----------|\n"
                output += f"| Preprocess | {speed.get('preprocess', 'N/A')} |\n"
                output += f"| Inference | {speed.get('inference', 'N/A')} |\n"
                output += f"| Postprocess | {speed.get('postprocess', 'N/A')} |\n"

            if detections:
                output += "### Detected Objects\n"
                output += "| Label | Class | Confidence |\n"
                output += "|-------|-------|------------|\n"

                for det in detections:
                    name = det.get("name", "Unknown")
                    class_id = det.get("class", "N/A")
                    conf = det.get("confidence", 0)
                    output += f"| {name} | {class_id} | {conf:.2%} |\n"

        return output

    return str(result)

dark_theme = gr.themes.Monochrome(
    primary_hue="slate",
    secondary_hue="slate",
).set(
    body_text_color="#e0e0e0",
    background_fill_primary="#0f0f0f",
    background_fill_secondary="#1a1a1a",
)

with gr.Blocks(
    title="Figure Detection",
    theme=dark_theme,
    css="""
    footer {display: none !important;}
    .gradio-container {border-radius: 12px;}
    .gr-card {border-radius: 12px;}
    .block {border-radius: 12px;}
    .form {border-radius: 12px;}
    button {border-radius: 12px;}
    .gr-button {border-radius: 12px;}
    #imageModal {
        display: none;
        position: fixed;
        z-index: 10000;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.9);
        animation: fadeIn 0.3s;
    }
    @keyframes fadeIn {
        from {opacity: 0;}
        to {opacity: 1;}
    }
    #modalImage {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        max-width: 95%;
        max-height: 95%;
        object-fit: contain;
        touch-action: pinch-zoom;
        cursor: zoom-out;
    }
    .modal-open {
        overflow: hidden;
    }
    .closeBtn {
        position: absolute;
        top: 20px;
        right: 30px;
        font-size: 40px;
        font-weight: bold;
        color: white;
        cursor: pointer;
        z-index: 10001;
    }
    .closeBtn:hover {
        color: #bbb;
    }
    """
) as demo:
    with gr.Column():
        gr.Markdown("""
        # Figure Detection
        Detect figures in your documents. Upload an image and adjust parameters to detect figures with custom inference settings.
        """)

        with gr.Row():
            with gr.Column(scale=1, min_width=400):
                gr.Markdown("### Input")
                image_input = gr.Image(
                    label="Image",
                    type="pil",
                    sources=["upload"],
                    interactive=True
                )
                
                test_images = get_test_images()
                if test_images:
                    test_image_radio = gr.Radio(
                        choices=[img[1] for img in test_images],
                        label="Select test image",
                        info="Click to load"
                    )
                    test_image_radio.change(
                        fn=lambda name: load_test_image(next((img[0] for img in test_images if img[1] == name), None)),
                        inputs=[test_image_radio],
                        outputs=[image_input]
                    )
                else:
                    gr.Markdown("No test images found. Add images to the 'images' folder.")

                gr.Markdown("### Configuration")

                confidence_slider = gr.Slider(
                    label="Confidence Threshold",
                    minimum=0.0,
                    maximum=1.0,
                    value=0.25,
                    step=0.01,
                    info="Detection confidence level"
                )

                iou_slider = gr.Slider(
                    label="IOU Threshold",
                    minimum=0.0,
                    maximum=1.0,
                    value=0.7,
                    step=0.01,
                    info="Intersection over union threshold"
                )

                imgsz_slider = gr.Slider(
                    label="Image Size",
                    minimum=320,
                    maximum=1280,
                    value=640,
                    step=32,
                    info="Inference image resolution"
                )

                predict_btn = gr.Button(
                    "Detect Objects",
                    variant="primary",
                    size="lg",
                    scale=1
                )

            with gr.Column(scale=1, min_width=400):
                gr.Markdown("### Results")

                image_output = gr.Image(
                    label="Detections (Click to fullscreen)",
                    type="pil",
                    interactive=False,
                    scale=1
                )

                results_output = gr.Markdown(
                    value="Detection results will appear here.",
                    label="Detection Results"
                )

                gr.HTML("""
                <div id="imageModal">
                    <span class="closeBtn">&times;</span>
                    <img id="modalImage" src="" alt="Fullscreen Detection">
                </div>
                <script>
                    const modal = document.getElementById('imageModal');
                    const modalImg = document.getElementById('modalImage');
                    const closeBtn = document.querySelector('.closeBtn');
                    let touchStartX = 0;
                    let touchStartY = 0;
                    let scale = 1;
                    const observeImageChanges = () => {
                        const imageContainer = document.querySelector('[data-testid="image"]') ||
                                             document.querySelector('img[alt="Image"]');
                        if (imageContainer) {
                            const images = imageContainer.querySelectorAll('img');
                            images.forEach(img => {
                                if (img.src && !img.hasClickListener) {
                                    img.style.cursor = 'pointer';
                                    img.addEventListener('click', (e) => {
                                        if (e.target.src && !e.target.src.includes('data:image/svg')) {
                                            modalImg.src = e.target.src;
                                            modal.style.display = 'block';
                                            document.body.classList.add('modal-open');
                                            scale = 1;
                                            modalImg.style.transform = 'translate(-50%, -50%) scale(1)';
                                        }
                                    });
                                    img.hasClickListener = true;
                                }
                            });
                        }
                    };
                    setInterval(observeImageChanges, 500);
                    observeImageChanges();
                    modal.addEventListener('click', (e) => {
                        if (e.target === modal) {
                            modal.style.display = 'none';
                            document.body.classList.remove('modal-open');
                            scale = 1;
                        }
                    });
                    closeBtn.addEventListener('click', () => {
                        modal.style.display = 'none';
                        document.body.classList.remove('modal-open');
                        scale = 1;
                    });
                    document.addEventListener('keydown', (e) => {
                        if (e.key === 'Escape' && modal.style.display === 'block') {
                            modal.style.display = 'none';
                            document.body.classList.remove('modal-open');
                            scale = 1;
                        }
                    });
                    let lastDistance = 0;
                    modalImg.addEventListener('touchstart', (e) => {
                        if (e.touches.length === 2) {
                            const dx = e.touches[0].clientX - e.touches[1].clientX;
                            const dy = e.touches[0].clientY - e.touches[1].clientY;
                            lastDistance = Math.sqrt(dx * dx + dy * dy);
                        }
                        touchStartX = e.touches[0].clientX;
                        touchStartY = e.touches[0].clientY;
                    });
                    modalImg.addEventListener('touchmove', (e) => {
                        if (e.touches.length === 2) {
                            const dx = e.touches[0].clientX - e.touches[1].clientX;
                            const dy = e.touches[0].clientY - e.touches[1].clientY;
                            const distance = Math.sqrt(dx * dx + dy * dy);
                            const scaleChange = distance / lastDistance;
                            scale = Math.max(1, Math.min(scale * scaleChange, 4));
                            modalImg.style.transform = `translate(-50%, -50%) scale(${scale})`;
                            lastDistance = distance;
                        }
                    });
                    modalImg.addEventListener('touchend', () => {
                        lastDistance = 0;
                    });
                </script>
                """)

    predict_btn.click(
        fn=predict_image,
        inputs=[image_input, confidence_slider, iou_slider, imgsz_slider],
        outputs=[image_output, results_output]
    )

    image_input.change(
        fn=predict_image,
        inputs=[image_input, confidence_slider, iou_slider, imgsz_slider],
        outputs=[image_output, results_output]
    )

    confidence_slider.change(
        fn=predict_image,
        inputs=[image_input, confidence_slider, iou_slider, imgsz_slider],
        outputs=[image_output, results_output]
    )

    iou_slider.change(
        fn=predict_image,
        inputs=[image_input, confidence_slider, iou_slider, imgsz_slider],
        outputs=[image_output, results_output]
    )

    imgsz_slider.change(
        fn=predict_image,
        inputs=[image_input, confidence_slider, iou_slider, imgsz_slider],
        outputs=[image_output, results_output]
    )

if __name__ == "__main__":
    demo.launch(share=False, show_error=True)