from typing import Tuple

import gradio as gr
import numpy as np
import supervision as sv
from inference import get_model

MARKDOWN = """
<h1 style='text-align: center'>YOLO-ARENA 🏟️</h1>

Welcome to YOLO-Arena! This demo showcases the performance of various YOLO models:

- YOLOv8
- YOLOv9
- YOLOv10
- YOLO-NAS

Powered by Roboflow [Inference](https://github.com/roboflow/inference) and 
[Supervision](https://github.com/roboflow/supervision).
"""

IMAGE_EXAMPLES = [
    ['https://media.roboflow.com/dog.jpeg', 0.3]
]

YOLO_V8_MODEL = get_model(model_id="yolov8m-640")
YOLO_NAS_MODEL = get_model(model_id="coco/15")
YOLO_V9_MODEL = get_model(model_id="coco/17")
YOLO_V10_MODEL = get_model(model_id="coco/22")

LABEL_ANNOTATORS = sv.LabelAnnotator(text_color=sv.Color.black())
BOUNDING_BOX_ANNOTATORS = sv.BoundingBoxAnnotator()


def detect_and_annotate(
    model,
    input_image: np.ndarray,
    confidence_threshold: float,
    iou_threshold: float
) -> np.ndarray:
    result = model.infer(
        input_image,
        confidence=confidence_threshold,
        iou_threshold=iou_threshold
    )[0]
    detections = sv.Detections.from_inference(result)
    annotated_image = input_image.copy()
    annotated_image = BOUNDING_BOX_ANNOTATORS.annotate(
        scene=annotated_image, detections=detections)
    annotated_image = LABEL_ANNOTATORS.annotate(
        scene=annotated_image, detections=detections)
    return annotated_image


def process_image(
    input_image: np.ndarray,
    confidence_threshold: float,
    iou_threshold: float
) -> Tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]:
    yolo_v8_annotated_image = detect_and_annotate(
        YOLO_V8_MODEL, input_image, confidence_threshold, iou_threshold)
    yolo_nas_annotated_image = detect_and_annotate(
        YOLO_NAS_MODEL, input_image, confidence_threshold, iou_threshold)
    yolo_v9_annotated_image = detect_and_annotate(
        YOLO_V9_MODEL, input_image, confidence_threshold, iou_threshold)
    yolo_10_annotated_image = detect_and_annotate(
        YOLO_V10_MODEL, input_image, confidence_threshold, iou_threshold)

    return (
        yolo_v8_annotated_image,
        yolo_nas_annotated_image,
        yolo_v9_annotated_image,
        yolo_10_annotated_image
    )


confidence_threshold_component = gr.Slider(
    minimum=0,
    maximum=1.0,
    value=0.3,
    step=0.01,
    label="Confidence Threshold",
    info=(
        "The confidence threshold for the YOLO model. Lower the threshold to "
        "reduce false negatives, enhancing the model's sensitivity to detect "
        "sought-after objects. Conversely, increase the threshold to minimize false "
        "positives, preventing the model from identifying objects it shouldn't."
    ))

iou_threshold_component = gr.Slider(
    minimum=0,
    maximum=1.0,
    value=0.5,
    step=0.01,
    label="IoU Threshold",
    info=(
        "The Intersection over Union (IoU) threshold for non-maximum suppression. "
        "Decrease the value to lessen the occurrence of overlapping bounding boxes, "
        "making the detection process stricter. On the other hand, increase the value "
        "to allow more overlapping bounding boxes, accommodating a broader range of "
        "detections."
    ))


with gr.Blocks() as demo:
    gr.Markdown(MARKDOWN)
    with gr.Accordion("Configuration", open=False):
        confidence_threshold_component.render()
        iou_threshold_component.render()
    with gr.Row():
        input_image_component = gr.Image(
            type='numpy',
            label='Input'
        )
        with gr.Column():
            with gr.Row():
                yolo_v8_output_image_component = gr.Image(
                    type='numpy',
                    label='YOLOv8m @ 640x640'
                )
                yolo_nas_output_image_component = gr.Image(
                    type='numpy',
                    label='YOLO-NAS M @ 640x640'
                )
            with gr.Row():
                yolo_v9_output_image_component = gr.Image(
                    type='numpy',
                    label='YOLOv9c @ 640x640'
                )
                yolo_v10_output_image_component = gr.Image(
                    type='numpy',
                    label='YOLOv10m @ 640x640'
                )
    submit_button_component = gr.Button(
        value='Submit',
        scale=1,
        variant='primary'
    )
    gr.Examples(
        fn=process_image,
        examples=IMAGE_EXAMPLES,
        inputs=[
            input_image_component,
            confidence_threshold_component,
            iou_threshold_component
        ],
        outputs=[
            yolo_v8_output_image_component,
            yolo_nas_output_image_component,
            yolo_v9_output_image_component,
            yolo_v10_output_image_component
        ]
    )

    submit_button_component.click(
        fn=process_image,
        inputs=[
            input_image_component,
            confidence_threshold_component,
            iou_threshold_component
        ],
        outputs=[
            yolo_v8_output_image_component,
            yolo_nas_output_image_component,
            yolo_v9_output_image_component,
            yolo_v10_output_image_component
        ]
    )

demo.launch(debug=False, show_error=True, max_threads=1)