import streamlit as st
import cv2
import json
import os
import re
from datetime import datetime
from io import BytesIO

import requests
import shutil
import vk_api
from bs4 import BeautifulSoup
from deepface import DeepFace
from googletrans import Translator
from reportlab.lib import colors
from reportlab.lib.pagesizes import letter
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import Image, SimpleDocTemplate, Table, TableStyle
from ultralytics import YOLO

with open("config.json", "r") as f:
    config = json.load(f)

FACE_DET_TRESH = config["FACE_DET_TRESH"]
FACE_DIST_TRESH = config["FACE_DIST_TRESH"]
YOLO_WEIGHTS_URL = config["YOLO_WEIGHTS_URL"]
AVATARS_URI = config["AVATARS_URI"]
APP_NAME = config["APP_NAME"]
APP_DESCRIPTION = config["APP_DESCRIPTION"]
APP_LOGO = config["APP_LOGO"]

def load_detector():
    yolo_weights_filename = os.path.basename(YOLO_WEIGHTS_URL)

    if not os.path.exists(yolo_weights_filename):
        response = requests.get(YOLO_WEIGHTS_URL)
        with open(yolo_weights_filename, "wb") as file:
            file.write(response.content)

    return YOLO(yolo_weights_filename)

model = load_detector()

styles = getSampleStyleSheet()
style_table = TableStyle([
    ("BACKGROUND", (0, 0), (-1, 0), colors.grey),
    ("TEXTCOLOR", (0, 0), (-1, 0), colors.whitesmoke),
    ("ALIGN", (0, 0), (-1, -1), "CENTER"),
    ("FONTNAME", (0, 0), (-1, 0), "Helvetica-Bold"),
    ("FONTSIZE", (0, 0), (-1, 0), 14),
    ("BOTTOMPADDING", (0, 0), (-1, 0), 12),
    ("BACKGROUND", (0, 1), (-1, -1), colors.beige),
    ("GRID", (0, 0), (-1, -1), 1, colors.black),
])

def parse_album(data):
    album_info = data["NGRX_STATE"]["game"]["info"]["data"]["photoSetUrl"]
    album_info = album_info.split("-")[-1].split("_")
    owner_id = - int(album_info[0])
    album_id = int(album_info[1])
    return owner_id, album_id

def get_photos(owner_id, album_id, vk):
    offset = 0
    total_count = float("inf")
    count_per_request = 50

    output = []

    while offset < total_count:
        params = {
            "owner_id": owner_id,
            "album_id": album_id,
            "count": count_per_request,
            "offset": offset,
            "extended": "1"
        }

        response = vk.photos.get(**params)
        
        for item in response["items"]:
            max_item = max(item["sizes"], key=lambda item: item["height"])
            output.append(max_item["url"])
        
        total_count = response["count"]
        offset += count_per_request
    
    return output

def download_images(photos, players):
    current_datetime = datetime.now()
    folder_name = current_datetime.strftime("%Y-%m-%d_%H-%M-%S")
    os.mkdir(folder_name)

    players_path = os.path.join(folder_name, "players")
    photos_path = os.path.join(folder_name, "photos")
    temp_path = os.path.join(folder_name, "temp")

    os.mkdir(players_path)
    os.mkdir(photos_path)
    os.mkdir(temp_path)

    update_progress(0, "Downloading photos...")
    for i, photo_url in enumerate(photos):
        filename = f"{i}.jpg"
        response = requests.get(photo_url)
        with open(os.path.join(photos_path, filename), "wb") as file:
            file.write(response.content)
        update_progress((i+1)/len(photos), "Downloading photos...")
    
    for team_state in players.keys():
        update_progress(0, f"Downloading {team_state} players' avatars...")
        for i, player in enumerate(players[team_state]):
            filename = f"{player['id']}.jpg"
            response = requests.get(player["avatar_url"])
            with open(os.path.join(players_path, filename), "wb") as file:
                file.write(response.content)
            update_progress((i+1)/len(players[team_state]), f"Downloading {team_state} players' avatars...")

    return {
        "photos_path": photos_path,
        "players_path": players_path,
        "temp_path": temp_path,
        "folder_name": folder_name
    }

def find_photos(data, vk):
    pattern = re.compile('<script id="axl-desktop-state" type="application/json">(.+?)</script>')
    script_content = pattern.search(data).group(1).replace('&q;', '"')

    data = json.loads(script_content)

    owner_id, album_id = parse_album(data)

    return get_photos(owner_id, album_id, vk)

def translate(text):
    translator = Translator()
    output = translator.translate(text, src="ru", dest="en")
    return output.text

def get_players(data):
    output = {}
    team_states = ["home", "away"]
    soup = BeautifulSoup(data, "lxml")

    for team_state in team_states:
        update_progress(0, f"Getting information about {team_state} players...")
        output[team_state] = []
        player_roots = soup.find_all("div", {"class": f"{team_state} ng-star-inserted"})
        for i, player_root in enumerate(player_roots):
            player_info = player_root.find("a", {"class": "wrapper ng-star-inserted"})
            id = re.findall(r"\d+", player_info["href"])[-1]
            avatar_url = AVATARS_URI.replace("PLAYER_ID", id)
            name = player_info.find("span", {"class": "name"}).get_text()
            name = translate(name)
            position = player_info.find("span", {"class": "position"}).get_text()
            output[team_state].append({
                "id": id,
                "name": name,
                "position": position,
                "avatar_url": avatar_url
            })
            update_progress((i+1)/len(player_roots), f"Getting information about {team_state} players...")

    return output

def load_players_avatars(players, images_path, face_det_tresh):
    for team_state in players.keys():
        update_progress(0, f"Reading avatars of {team_state} team...")
        for i, player in enumerate(players[team_state]):
            image_name = f"{player['id']}.jpg"
            player["image"] = read_image_from_path(os.path.join(images_path, image_name))
            faces = find_faces(player["image"], face_det_tresh)
            if faces:
                player["face"] = faces[0]
            
            update_progress((i+1)/len(players[team_state]), f"Reading avatars of {team_state} team...")

    return players

def find_distance(base_face, check_face):
    result = DeepFace.verify(base_face, check_face, enforce_detection=False)
    return result["distance"]

def read_image_from_path(path):
    return cv2.imread(path)

def read_images_from_path(path):
    images = []

    files = os.listdir(path)
    update_progress(0, "Reading photos...")

    for i, filename in enumerate(files):
        if filename.endswith(".jpg"):
            image = read_image_from_path(os.path.join(path, filename))

            if image is not None:
                images.append(image)
        
        update_progress((i+1)/len(files), "Reading photos...")
    
    return images

def cv2_to_reportlab(cv2_image):
    buffer = BytesIO()
    _, buffer = cv2.imencode(".jpg", cv2_image)
    io_buf = BytesIO(buffer)
    return Image(io_buf)

def find_faces(image, face_det_tresh):
  outputs = model(image)
  faces = []
  for box in outputs[0].boxes:
    if float(box.conf) >= face_det_tresh:
      x, y, w, h = [int(coord) for coord in box.xywh[0]]
      x_center, y_center = x + w / 2, y + h / 2
      x1 = int(x_center - w)
      y1 = int(y_center - h)
      crop_img = image[y1:y1+h, x1:x1+w]
      faces.append(crop_img)
  return faces

def is_face_exists(players, face, face_dist_tresh):
    for team_state in players.keys():
        for player in players[team_state]:
            if "face" in player:
                distance = find_distance(player["face"], face)
                if distance <= face_dist_tresh:
                    return player["id"], player["face"]
    return None, None

def add_players_table(elements, players):
    data = [
        ["Player ID", "Name", "Position", "Avatar", "Face"]
    ]
    for team_state in players.keys():
        update_progress(0, f"Creating dump of {team_state}'s squad...")
        for i, player in enumerate(players[team_state]):
            face = cv2_to_reportlab(player["face"]) if "face" in player else None
            avatar = cv2_to_reportlab(player["image"])
            line = [
                player["id"],
                player["name"],
                player["position"],
                avatar,
                face
            ]
            data.append(line)
            update_progress((i+1)/len(players[team_state]), f"Creating dump of {team_state}'s squad...")

    table = Table(data)
    table.setStyle(style_table)
    elements.append(table)

    return elements

def check_faces(elements, photos, players, face_det_tresh, face_dist_tresh):
    data = [
        ["Face", "Player ID", "Player Face"]
    ]

    update_progress(0, "Comparing faces...")
    for i, photo in enumerate(photos):
        faces = find_faces(photo, face_det_tresh)
        for j, face in enumerate(faces):
            player_id, player_face = is_face_exists(players, face, face_dist_tresh)
            face = cv2_to_reportlab(face)
            tmp_arr = [face, player_id]
            if player_face is not None:
                player_face = cv2_to_reportlab(player_face)
            tmp_arr.append(player_face)
            data.append(tmp_arr)
            update_progress((j+1)/len(faces), f"[{i + 1}/{len(photos)}] Comparing faces...")

    table = Table(data)
    table.setStyle(style_table)

    elements.append(table)

    return elements

def update_progress(percent, description):
    progress_bar.progress(percent)
    progress_status_text.text(description)

def process(token, afl_link, face_dist_tresh, face_det_tresh):
    update_progress(0, "Connecting to vk...")
    vk_session = vk_api.VkApi(token=token)
    vk = vk_session.get_api()
    update_progress(100, "Connected to vk")

    update_progress(0, "Getting information from afl...")
    response = requests.get(afl_link)
    update_progress(100, "Got information from afl")

    update_progress(0, "Getting information about photos...")
    photos = find_photos(response.text, vk)
    update_progress(100, "Got information about photos")

    players = get_players(response.text)
    result = download_images(photos, players)
    photos = read_images_from_path(result["photos_path"])
    players = load_players_avatars(players, result["players_path"], face_det_tresh)

    table_file = os.path.join(result["temp_path"], "table.pdf")

    doc = SimpleDocTemplate(table_file, pagesize=letter)

    elements = []
    elements = check_faces(elements, photos, players, face_det_tresh, face_dist_tresh)
    elements = add_players_table(elements, players)

    doc.build(elements)

    with open(table_file, "rb") as file:
        pdf_bytes = file.read()

    shutil.rmtree(result["folder_name"])

    update_progress(100, "Process completed")
    
    return pdf_bytes

st.set_page_config(page_title=APP_NAME)
st.title(APP_NAME)

st.image(APP_LOGO, use_column_width=True)

st.write(APP_DESCRIPTION)

access_token = st.text_input("Your VK API access token", help="You can obtain your token from https://vkhost.github.io/")
afl_url = st.text_input("AFL match url", help="Example: https://afl.ru/football/afl-moscow-8x8/afl-cup-krasnaya-presnya-3097/matches/463676")

face_det_tresh = st.slider("face_det_tresh:", 0.0, 1.0, FACE_DET_TRESH, 0.01, help="Adjust the threshold value for face detection.")
face_dist_tresh = st.slider("face_dist_tresh:", 0.0, 1.0, FACE_DIST_TRESH, 0.01, help="Adjust the threshold to determine the maximum acceptable distance between faces.")

button_clicked = st.button("Process")

if button_clicked:
    progress_bar = st.progress(0)
    progress_status_text = st.empty()
    pdf_bytes = process(access_token, afl_url, face_dist_tresh, face_det_tresh)
    st.download_button(label="Download PDF", data=pdf_bytes, file_name="output.pdf")