import os
import cv2
import gradio as gr
import numpy as np
import random
import base64
import requests
import json
import time
from PIL import Image


def tryon(person_img, garment_img, seed, randomize_seed):
    post_start_time = time.time()
    if person_img is None or garment_img is None:
        gr.Warning("Empty image")
        return None, None, "Empty image"
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    encoded_person_img = cv2.imencode('.jpg', cv2.cvtColor(person_img, cv2.COLOR_RGB2BGR))[1].tobytes()
    encoded_person_img = base64.b64encode(encoded_person_img).decode('utf-8')
    encoded_garment_img = cv2.imencode('.jpg', cv2.cvtColor(garment_img, cv2.COLOR_RGB2BGR))[1].tobytes()
    encoded_garment_img = base64.b64encode(encoded_garment_img).decode('utf-8')

    url = "http://" + os.environ['tryon_url'] + "Submit"
    token = os.environ['token']
    cookie = os.environ['Cookie']
    referer = os.environ['referer']
    headers = {'Content-Type': 'application/json', 'token': token, 'Cookie': cookie, 'referer': referer}
    data = {
        "clothImage": encoded_garment_img,
        "humanImage": encoded_person_img,
        "seed": seed
    }
    try:
        response = requests.post(url, headers=headers, data=json.dumps(data), timeout=50)
        if response.status_code == 200:
            result = response.json()['result']
            status = result['status']
            if status == "success":
                uuid = result['result']
    except Exception as err:
        print(f"Post Exception Error: {err}")
        raise gr.Error("Too many users, please try again later")
    post_end_time = time.time()
    print(f"post time used: {post_end_time-post_start_time}")

    get_start_time = time.time()
    time.sleep(9)
    Max_Retry = 12
    result_img = None
    info = ""
    err_log = ""
    for i in range(Max_Retry):
        try:
            url = "http://" + os.environ['tryon_url'] + "Query?taskId=" + uuid
            response = requests.get(url, headers=headers, timeout=20)
            if response.status_code == 200:
                result = response.json()['result']
                status = result['status']
                if status == "success":
                    result = base64.b64decode(result['result'])
                    result_np = np.frombuffer(result, np.uint8)
                    result_img = cv2.imdecode(result_np, cv2.IMREAD_UNCHANGED)
                    result_img = cv2.cvtColor(result_img, cv2.COLOR_RGB2BGR)
                    info = "Success"
                    break
                elif status == "error":
                    err_log = f"Status is Error"
                    info = "Error"
                    break
            else:
                err_log = "URL error, please contact the admin"
                info = "URL error, please contact the admin"
                break
        except requests.exceptions.ReadTimeout:
            err_log = "Http Timeout"
            info = "Http Timeout, please try again later"
        except Exception as err:
            err_log = f"Get Exception Error: {err}"
        time.sleep(1)
    get_end_time = time.time()
    print(f"get time used: {get_end_time-get_start_time}")
    print(f"all time used: {get_end_time-get_start_time+post_end_time-post_start_time}")
    if info == "":
        err_log = f"No image after {Max_Retry} retries"
        info = "Too many users, please try again later"
    if info != "Success":
        print(f"Error Log: {err_log}")
        gr.Warning("Too many users, please try again later")

    return result_img, seed, info


def start_tryon(person_img, garment_img, seed, randomize_seed):
    start_time = time.time()
    if person_img is None or garment_img is None:
        return None, None, "Empty image"
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    encoded_person_img = cv2.imencode('.jpg', cv2.cvtColor(person_img, cv2.COLOR_RGB2BGR))[1].tobytes()
    encoded_person_img = base64.b64encode(encoded_person_img).decode('utf-8')
    encoded_garment_img = cv2.imencode('.jpg', cv2.cvtColor(garment_img, cv2.COLOR_RGB2BGR))[1].tobytes()
    encoded_garment_img = base64.b64encode(encoded_garment_img).decode('utf-8')

    url = "http://" + os.environ['tryon_url']
    token = os.environ['token']
    cookie = os.environ['Cookie']
    referer = os.environ['referer']

    headers = {'Content-Type': 'application/json', 'token': token, 'Cookie': cookie, 'referer': referer}
    data = {
        "clothImage": encoded_garment_img,
        "humanImage": encoded_person_img,
        "seed": seed
    }

    result_img = None
    try:
        session = requests.Session()
        response = session.post(url, headers=headers, data=json.dumps(data), timeout=60)
        print("response code", response.status_code)
        if response.status_code == 200:
            result = response.json()['result']
            status = result['status']
            if status == "success":
                result = base64.b64decode(result['result'])
                result_np = np.frombuffer(result, np.uint8)
                result_img = cv2.imdecode(result_np, cv2.IMREAD_UNCHANGED)
                result_img = cv2.cvtColor(result_img, cv2.COLOR_RGB2BGR)
                info = "Success"
            else:
                info = "Try again later"
        else:
            print(response.text)
            info = "URL error, please contact the admin"
    except requests.exceptions.ReadTimeout:
        print("timeout")
        info = "Too many users, please try again later"
        raise gr.Error("Too many users, please try again later")
    except Exception as err:
        print(f"Other error: {err}")
        info = "Error, please contact the admin"
    end_time = time.time()
    print(f"time used: {end_time-start_time}")

    return result_img, seed, info


def capture_person_photo(webcam_image):
    """Process captured person photo from webcam"""
    if webcam_image is None:
        gr.Warning("No image captured from camera")
        return None
    return webcam_image


def capture_garment_photo(webcam_image):
    """Process captured garment photo from webcam"""
    if webcam_image is None:
        gr.Warning("No image captured from camera")
        return None
    return webcam_image


def clear_person_image():
    """Clear the person image"""
    return None


def clear_garment_image():
    """Clear the garment image"""
    return None


def switch_to_upload_person():
    """Switch to upload mode for person image"""
    return gr.update(visible=True), gr.update(visible=False)


def switch_to_camera_person():
    """Switch to camera mode for person image"""
    return gr.update(visible=False), gr.update(visible=True)


def switch_to_upload_garment():
    """Switch to upload mode for garment image"""
    return gr.update(visible=True), gr.update(visible=False)


def switch_to_camera_garment():
    """Switch to camera mode for garment image"""
    return gr.update(visible=False), gr.update(visible=True)


MAX_SEED = 999999

example_path = os.path.join(os.path.dirname(__file__), 'assets')

# Check if assets directory exists, if not create dummy lists
if os.path.exists(example_path):
    garm_list = os.listdir(os.path.join(example_path, "cloth")) if os.path.exists(os.path.join(example_path, "cloth")) else []
    garm_list_path = [os.path.join(example_path, "cloth", garm) for garm in garm_list]
    
    human_list = os.listdir(os.path.join(example_path, "human")) if os.path.exists(os.path.join(example_path, "human")) else []
    human_list_path = [os.path.join(example_path, "human", human) for human in human_list]
else:
    garm_list_path = []
    human_list_path = []

css = """
#col-left {
    margin: 0 auto;
    max-width: 450px;
}
#col-mid {
    margin: 0 auto;
    max-width: 450px;
}
#col-right {
    margin: 0 auto;
    max-width: 450px;
}
#col-showcase {
    margin: 0 auto;
    max-width: 1100px;
}
#button {
    color: blue;
}
.camera-section {
    border: 2px dashed #ccc;
    border-radius: 10px;
    padding: 10px;
    margin: 5px 0;
}
.mode-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}
"""

def load_description(fp):
    """Load description from file if it exists, otherwise return default"""
    try:
        with open(fp, 'r', encoding='utf-8') as f:
            content = f.read()
        return content
    except FileNotFoundError:
        return """
        # 🎯 Virtual Try-On Application
        
        **Experience the future of fashion with AI-powered virtual try-on technology!**
        
        Upload or capture photos of yourself and garments to see how they look together.
        """

def change_imgs(image1, image2):
    return image1, image2

with gr.Blocks(css=css) as Tryon:
    gr.HTML(load_description("assets/title.md"))
    
    with gr.Row():
        with gr.Column(elem_id="col-left"):
            gr.HTML("""
            <div style="display: flex; justify-content: center; align-items: center; text-align: center; font-size: 20px;">
                <div>
                📸 Step 1. Get Person Image ⬇️
                </div>
            </div>
            """)
        with gr.Column(elem_id="col-mid"):
            gr.HTML("""
            <div style="display: flex; justify-content: center; align-items: center; text-align: center; font-size: 20px;">
                <div>
                👔 Step 2. Get Garment Image ⬇️
                </div>
            </div>
            """)
        with gr.Column(elem_id="col-right"):
            gr.HTML("""
            <div style="display: flex; justify-content: center; align-items: center; text-align: center; font-size: 20px;">
                <div>
                ✨ Step 3. Generate Try-On Result
                </div>
            </div>
            """)
    
    with gr.Row():
        # Person Image Column
        with gr.Column(elem_id="col-left"):
            # Mode selection buttons for person
            with gr.Row(elem_classes="mode-buttons"):
                upload_person_btn = gr.Button("📁 Upload Photo", variant="secondary", size="sm")
                camera_person_btn = gr.Button("📷 Take Photo", variant="secondary", size="sm")
                clear_person_btn = gr.Button("🗑️ Clear", variant="secondary", size="sm")
            
            # Upload interface for person (visible by default)
            with gr.Group(visible=True) as person_upload_group:
                person_img_upload = gr.Image(
                    label="Person Image (Upload)", 
                    sources=['upload'], 
                    type="numpy",
                    height=400
                )
            
            # Camera interface for person (hidden by default)
            with gr.Group(visible=False, elem_classes="camera-section") as person_camera_group:
                person_img_camera = gr.Image(
                    label="Person Image (Camera)", 
                    sources=['webcam'], 
                    type="numpy",
                    height=400
                )
                capture_person_btn = gr.Button("📸 Capture Person Photo", variant="primary")
            
            # Combined person image state
            person_img_final = gr.State()
            
            # Examples for person images
            if human_list_path:
                example_person = gr.Examples(
                    inputs=person_img_upload,
                    examples_per_page=8,
                    examples=human_list_path,
                    label="Example Person Images"
                )
        
        # Garment Image Column
        with gr.Column(elem_id="col-mid"):
            # Mode selection buttons for garment
            with gr.Row(elem_classes="mode-buttons"):
                upload_garment_btn = gr.Button("📁 Upload Photo", variant="secondary", size="sm")
                camera_garment_btn = gr.Button("📷 Take Photo", variant="secondary", size="sm")
                clear_garment_btn = gr.Button("🗑️ Clear", variant="secondary", size="sm")
            
            # Upload interface for garment (visible by default)
            with gr.Group(visible=True) as garment_upload_group:
                garment_img_upload = gr.Image(
                    label="Garment Image (Upload)", 
                    sources=['upload'], 
                    type="numpy",
                    height=400
                )
            
            # Camera interface for garment (hidden by default)
            with gr.Group(visible=False, elem_classes="camera-section") as garment_camera_group:
                garment_img_camera = gr.Image(
                    label="Garment Image (Camera)", 
                    sources=['webcam'], 
                    type="numpy",
                    height=400
                )
                capture_garment_btn = gr.Button("📸 Capture Garment Photo", variant="primary")
            
            # Combined garment image state
            garment_img_final = gr.State()
            
            # Examples for garment images
            if garm_list_path:
                example_garment = gr.Examples(
                    inputs=garment_img_upload,
                    examples_per_page=8,
                    examples=garm_list_path,
                    label="Example Garment Images"
                )
        
        # Results Column
        with gr.Column(elem_id="col-right"):
            image_out = gr.Image(label="🎯 Try-On Result", show_share_button=False, height=400)
            
            with gr.Row():
                seed = gr.Slider(
                    label="Seed",
                    minimum=0,
                    maximum=MAX_SEED,
                    step=1,
                    value=0,
                )
                randomize_seed = gr.Checkbox(label="Random seed", value=True)
            
            with gr.Row():
                seed_used = gr.Number(label="Seed used")
                result_info = gr.Text(label="Status")
            
            # Main try-on button
            tryon_button = gr.Button("🚀 Generate Try-On", variant="primary", size="lg")
    
    # Event handlers for person image mode switching
    upload_person_btn.click(
        switch_to_upload_person,
        outputs=[person_upload_group, person_camera_group]
    )
    
    camera_person_btn.click(
        switch_to_camera_person,
        outputs=[person_upload_group, person_camera_group]
    )
    
    clear_person_btn.click(
        clear_person_image,
        outputs=[person_img_upload]
    )
    
    # Event handlers for garment image mode switching
    upload_garment_btn.click(
        switch_to_upload_garment,
        outputs=[garment_upload_group, garment_camera_group]
    )
    
    camera_garment_btn.click(
        switch_to_camera_garment,
        outputs=[garment_upload_group, garment_camera_group]
    )
    
    clear_garment_btn.click(
        clear_garment_image,
        outputs=[garment_img_upload]
    )
    
    # Capture button handlers
    capture_person_btn.click(
        capture_person_photo,
        inputs=[person_img_camera],
        outputs=[person_img_final]
    )
    
    capture_garment_btn.click(
        capture_garment_photo,
        inputs=[garment_img_camera],
        outputs=[garment_img_final]
    )
    
    # Function to get the current person image
    def get_current_person_image(upload_img, camera_img, final_img):
        if final_img is not None:
            return final_img
        elif upload_img is not None:
            return upload_img
        elif camera_img is not None:
            return camera_img
        return None
    
    # Function to get the current garment image
    def get_current_garment_image(upload_img, camera_img, final_img):
        if final_img is not None:
            return final_img
        elif upload_img is not None:
            return upload_img
        elif camera_img is not None:
            return camera_img
        return None
    
    # Modified try-on function to handle multiple image sources
    def run_tryon(person_upload, person_camera, person_final, 
                  garment_upload, garment_camera, garment_final, 
                  seed, randomize_seed):
        
        # Get the current person image
        person_img = get_current_person_image(person_upload, person_camera, person_final)
        
        # Get the current garment image
        garment_img = get_current_garment_image(garment_upload, garment_camera, garment_final)
        
        # Run the try-on process
        return tryon(person_img, garment_img, seed, randomize_seed)
    
    # Main try-on button click handler
    tryon_button.click(
        fn=run_tryon,
        inputs=[
            person_img_upload, person_img_camera, person_img_final,
            garment_img_upload, garment_img_camera, garment_img_final,
            seed, randomize_seed
        ],
        outputs=[image_out, seed_used, result_info],
        api_name=False,
        concurrency_limit=45
    )
    
    # Showcase section
    with gr.Column(elem_id="col-showcase"):
        gr.HTML("""
        <div style="display: flex; justify-content: center; align-items: center; text-align: center; font-size: 20px; margin-top: 30px;">
            <div>
            🌟 Virtual Try-On Examples
            <br><br>
            <em>See how different garments look on various models</em>
            </div>
        </div>
        """)
        
        # Only show examples if they exist
        if os.path.exists("assets/examples"):
            show_case = gr.Examples(
                examples=[
                    ["assets/examples/model2.png", "assets/examples/garment2.png", "assets/examples/result2.png"],
                    ["assets/examples/model3.png", "assets/examples/garment3.png", "assets/examples/result3.png"],
                    ["assets/examples/model1.png", "assets/examples/garment1.png", "assets/examples/result1.png"],
                ],
                inputs=[person_img_upload, garment_img_upload, image_out],
                label="Example Try-On Results"
            )

# Launch the app
if __name__ == "__main__":
    Tryon.queue(api_open=False).launch(
        show_api=False,
        share=False,
        server_name="0.0.0.0",
        server_port=7860
    )