import gradio as gr
import torch
from transformers import SwinForImageClassification, AutoFeatureExtractor
import mediapipe as mp
import cv2
from PIL import Image
import numpy as np
import os

# --- Face shape descriptions
face_shape_descriptions = {
    "Heart": "dengan dahi lebar dan dagu yang runcing.",
    "Oblong": "yang lebih panjang dari lebar dengan garis pipi lurus.",
    "Oval": "dengan proporsi seimbang dan dagu sedikit melengkung.",
    "Round": "dengan garis rahang melengkung dan pipi penuh.",
    "Square": "dengan rahang tegas dan dahi lebar."
}

# --- Glasses frame images
glasses_images = {
    "Oval": "glasses/oval.jpg",
    "Round": "glasses/round.jpg",
    "Square": "glasses/square.jpg",
    "Octagon": "glasses/octagon.jpg",
    "Cat Eye": "glasses/cat eye.jpg",
    "Pilot (Aviator)": "glasses/aviator.jpg"
}

# Ensure folder exists
if not os.path.exists("glasses"):
    os.makedirs("glasses")
    for _, path in glasses_images.items():
        if not os.path.exists(path):
            Image.new('RGB', (200, 100), color='gray').save(path)

id2label = {0: 'Heart', 1: 'Oblong', 2: 'Oval', 3: 'Round', 4: 'Square'}
label2id = {v: k for k, v in id2label.items()}

# --- Load model
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model_checkpoint = "microsoft/swin-tiny-patch4-window7-224"
feature_extractor = AutoFeatureExtractor.from_pretrained(model_checkpoint)

model = SwinForImageClassification.from_pretrained(
    model_checkpoint,
    label2id=label2id,
    id2label=id2label,
    ignore_mismatched_sizes=True
)

# Load trained weights if available
if os.path.exists('LR-0001-adamW-32-64swin.pth'):
    state_dict = torch.load('LR-0001-adamW-32-64swin.pth', map_location=device)
    model.load_state_dict(state_dict, strict=False)
model.to(device).eval()

# --- Mediapipe
mp_face_detection = mp.solutions.face_detection.FaceDetection(model_selection=1, min_detection_confidence=0.5)

# --- Decision tree rules
def recommend_glasses_tree(face_shape):
    face_shape = face_shape.lower()
    if face_shape == "square":
        return ["Oval", "Round"]
    elif face_shape == "round":
        return ["Square", "Octagon", "Cat Eye"]
    elif face_shape == "oval":
        return ["Oval", "Pilot (Aviator)", "Cat Eye", "Round"]
    elif face_shape == "heart":
        return ["Oval", "Round", "Cat Eye", "Pilot (Aviator)"]
    elif face_shape == "oblong":
        return ["Square", "Pilot (Aviator)", "Cat Eye"]
    else:
        return []

# --- Preprocess image
def preprocess_image(image):
    img = np.array(image, dtype=np.uint8)
    img = cv2.cvtColor(img, cv2.COLOR_RGB2BGR)

    results = mp_face_detection.process(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))

    if not results.detections:
        return None  # no face detected

    detection = results.detections[0]
    bbox = detection.location_data.relative_bounding_box
    h, w, _ = img.shape
    x1 = max(int(bbox.xmin * w), 0)
    y1 = max(int(bbox.ymin * h), 0)
    x2 = min(int((bbox.xmin + bbox.width) * w), w)
    y2 = min(int((bbox.ymin + bbox.height) * h), h)

    if x2 <= x1 or y2 <= y1:
        return None

    face_img = img[y1:y2, x1:x2]
    face_img = cv2.resize(face_img, (224, 224))
    face_img = cv2.cvtColor(face_img, cv2.COLOR_BGR2RGB)

    inputs = feature_extractor(images=face_img, return_tensors="pt")
    return inputs['pixel_values'].squeeze(0)

# --- Prediction
def predict(image):
    try:
        inputs = preprocess_image(image)
        if inputs is None:
            return "Unknown", "⚠️ Wajah tidak terdeteksi. Silakan upload foto dengan wajah yang jelas.", []

        inputs = inputs.unsqueeze(0).to(device)
        with torch.no_grad():
            outputs = model(inputs)
            probs = torch.nn.functional.softmax(outputs.logits, dim=1)
            pred_idx = torch.argmax(probs, dim=1).item()
            pred_label = id2label[pred_idx]
            pred_prob = probs[0][pred_idx].item() * 100

        # --- threshold confidence
        if pred_prob < 70:
            return "Unknown", f"⚠️ Prediksi tidak yakin (Confidence {pred_prob:.2f}%). Silakan gunakan foto wajah yang lebih jelas.", []

        # --- glasses recommendation
        frame_recommendations = recommend_glasses_tree(pred_label)
        gallery_items = []
        for frame in frame_recommendations:
            frame_image_path = glasses_images.get(frame)
            if frame_image_path and os.path.exists(frame_image_path):
                gallery_items.append((Image.open(frame_image_path), frame))

        description = face_shape_descriptions.get(pred_label, "tidak dikenali")
        recommended_frames_text = ', '.join(frame_recommendations)

        explanation = (
            f"Bentuk wajah kamu adalah {pred_label} ({pred_prob:.2f}%). "
            f"Kamu memiliki bentuk wajah {description} "
            f"Rekomendasi bentuk kacamata: {recommended_frames_text}."
        )

        return pred_label, explanation, gallery_items

    except Exception as e:
        return "Error", f"Terjadi kesalahan: {str(e)}", []

# --- Gradio UI
with gr.Blocks(theme=gr.themes.Soft()) as iface:
    gr.Markdown("# 👓 Program Rekomendasi Kacamata Berdasarkan Bentuk Wajah")
    gr.Markdown("Upload foto wajahmu untuk mendapatkan rekomendasi bentuk kacamata yang sesuai.")

    with gr.Row():
        with gr.Column():
            image_input = gr.Image(type="pil")
            confirm_button = gr.Button("Konfirmasi")
            restart_button = gr.Button("Restart")
        with gr.Column():
            detected_shape = gr.Textbox(label="Bentuk Wajah Terdeteksi")
            explanation_output = gr.Textbox(label="Penjelasan")
            recommendation_gallery = gr.Gallery(label="Rekomendasi Kacamata", columns=3, show_label=False)

    confirm_button.click(predict, inputs=image_input, outputs=[detected_shape, explanation_output, recommendation_gallery])
    restart_button.click(lambda: (None, "", "", []), inputs=None, outputs=[image_input, detected_shape, explanation_output, recommendation_gallery])

    gr.Markdown("**Sumber gambar kacamata**: Katalog dari [glassdirect.co.uk](https://www.glassdirect.co.uk)")

if __name__ == "__main__":
    iface.launch()