import hashlib
import json
import os
import gradio as gr

# File to store user credentials
USERS_FILE = "users.json"


def load_users():
    """Load users from JSON file"""
    if os.path.exists(USERS_FILE):
        with open(USERS_FILE, "r") as f:
            return json.load(f)
    return {}


def save_users(users):
    """Save users to JSON file"""
    with open(USERS_FILE, "w") as f:
        json.dump(users, f)


def hash_password(password):
    """Hash password using SHA-256"""
    return hashlib.sha256(password.encode()).hexdigest()


def associate_user_with_manager(users, user_assignment_manager):
    user_list = users.keys()
    print(f"registering--Associating users with manager: {list(user_list)}")
    user_assignment_manager.register_active_users(list(user_list))


def register_user(username, password, confirm_password, user_assignment_manager):
    """Register a new user"""
    if not username or not password:
        return "", "Username and password cannot be empty!", None

    if password != confirm_password:
        return "", "Passwords do not match!", None

    if len(password) < 6:
        return "", "Password must be at least 6 characters long!", None

    users = load_users()

    if username in users:
        return "", "Username already exists!", None

    users[username] = hash_password(password)
    save_users(users)

    try:
        associate_user_with_manager(users, user_assignment_manager)
    except Exception as e:
        print(f"Error associating user with manager: {e}")

    return "", f"✅ Registration successful! You can now login.", None


def login_user(username, password, state):
    """Validate user login"""
    if not username or not password:
        return (
            "Please enter both username and password!",
            "",
            state,
            gr.update(visible=True),
            gr.update(visible=False),
            gr.update(visible=False),
            gr.update(open=True),
        )

    users = load_users()

    if username not in users:
        return (
            "Invalid username or password!",
            "",
            state,
            gr.update(visible=True),
            gr.update(visible=False),
            gr.update(visible=False),
            gr.update(open=True),
        )

    if users[username] != hash_password(password):
        return (
            "Invalid username or password!",
            "",
            state,
            gr.update(visible=True),
            gr.update(visible=False),
            gr.update(visible=False),
            gr.update(open=True),
        )

    # Login successful
    state = {"logged_in": True, "username": username}
    return (
        f"✅ Welcome back, {username}!",
        "",
        state,
        gr.update(visible=False),
        gr.update(visible=True),
        gr.update(visible=True),
        gr.update(open=False),
    )


def logout_user(state):
    """Logout current user"""
    state = {"logged_in": False, "username": None}
    return (
        "Logged out successfully!",
        state,
        gr.update(visible=True),
        gr.update(visible=False),
        gr.update(visible=False),
    )


def protected_content(state):
    """Content only accessible to logged-in users"""
    if state.get("logged_in"):
        return f"You are logged as {state.get('username')}\n"
    return "Please login to access this content."



def get_user_assessments_done(connection_db, username):
    """
        it returns:
        {
        "https://example.com/page1": [1, 3, 5],
        "https://example.com/page2": [2, 4, 6],
    }
    """

    cursor = connection_db.cursor()
    username = json.dumps({"username": username}, ensure_ascii=False)
    cursor.execute(
        """
            SELECT page_url, json_output_data
            FROM wcag_user_assessments 
            WHERE user = ? AND insert_type = ?
            ORDER BY page_url
        """,
        (username, "wcag_user_llm_alttext_assessments"),
    )

    rows = cursor.fetchall()
    assessment_done = {}  # dict: {page_url: sorted list of image numbers}
    for row in rows:
        page_url = row[0]
        data = json.loads(row[1])
        image_numbers = {int(item["Image #"]) for item in data}  # set to deduplicate
        if page_url not in assessment_done:
            assessment_done[page_url] = image_numbers
        else:
            assessment_done[page_url].update(
                image_numbers
            )  # merge if url appears multiple times

    # Convert sets to sorted lists
    assessment_done = {url: sorted(imgs) for url, imgs in assessment_done.items()}

    return assessment_done