from flask import Blueprint, render_template, request, session, jsonify, redirect, url_for
import os
import re
from salesforce import get_salesforce_connection

menu_blueprint = Blueprint('menu', __name__)

# Initialize Salesforce connection
sf = get_salesforce_connection()

# Constants for video handling
STATIC_DIR = os.path.join(os.path.dirname(__file__), 'static')
PLACEHOLDER_VIDEO = 'placeholder.mp4'
PLACEHOLDER_PATH = os.path.join(STATIC_DIR, PLACEHOLDER_VIDEO)
SECTION_ORDER = ["Best Sellers", "Starters", "Biryanis", "Curries", "Breads", "Customized dish", "Apetizer", "Desserts", "Soft Drinks"]

# Create placeholder video at startup if it doesn't exist
if not os.path.exists(PLACEHOLDER_PATH):
    with open(PLACEHOLDER_PATH, 'wb') as f:
        f.close()
    print(f"Created placeholder video at {PLACEHOLDER_PATH}")

def get_valid_video_path(item_name, video_url=None):
    """Get valid video path for item with placeholder fallback."""
    if video_url:
        if video_url.startswith(('http://', 'https://')):
            return video_url
        elif video_url.startswith('/'):
            return video_url
        elif video_url.startswith('069'):
            return f"https://biryanihub-dev-ed.develop.my.salesforce.com/sfc/servlet.shepherd/version/download/{video_url}"
    if not os.path.exists(PLACEHOLDER_PATH):
        with open(PLACEHOLDER_PATH, 'wb') as f:
            f.close()
        print(f"Created missing placeholder video at {PLACEHOLDER_PATH}")
    return f"/static/{PLACEHOLDER_VIDEO}"

def fetch_menu_data(selected_category, user_email):
    """Common function to fetch and process menu data."""
    try:
        # Fetch user referral and reward points
        user_query = f"SELECT Referral__c, Reward_Points__c FROM Customer_Login__c WHERE Email__c = '{user_email}'"
        user_result = sf.query(user_query)
        if not user_result.get('records'):
            return None, None, None, None, None, None

        referral_code = user_result['records'][0].get('Referral__c', 'N/A')
        reward_points = user_result['records'][0].get('Reward_Points__c', 0)

        # Get cart item count
        cart_query = f"SELECT COUNT() FROM Cart_Item__c WHERE Customer_Email__c = '{user_email}'"
        cart_count_result = sf.query(cart_query)
        cart_item_count = cart_count_result.get('totalSize', 0)

        # Fetch all Menu_Item__c records with required fields
        menu_query = """
            SELECT Name, Price__c, Description__c, Image1__c, Image2__c, 
                   Veg_NonVeg__c, Section__c, Total_Ordered__c, Video1__c,
                   IngredientsInfo__c, NutritionalInfo__c, Allergens__c
            FROM Menu_Item__c
        """
        menu_result = sf.query_all(menu_query)
        food_items = menu_result.get('records', [])

        # Process menu items
        for item in food_items:
            item['Total_Ordered__c'] = item.get('Total_Ordered__c', 0) or 0
            item['Video1__c'] = get_valid_video_path(item['Name'], item.get('Video1__c'))
            item['Section__c'] = item.get('Section__c', "Others")
            item['Description__c'] = item.get('Description__c', "No description available")
            item['IngredientsInfo__c'] = item.get('IngredientsInfo__c', "Not specified")
            item['NutritionalInfo__c'] = item.get('NutritionalInfo__c', "Not available")
            item['Allergens__c'] = item.get('Allergens__c', "None listed")
            item['is_menu_item'] = True  # Flag to identify Menu_Item__c records

        # Fetch all Custom_Dish__c records with only existing fields
        custom_dish_query = """
            SELECT Name, Price__c, Description__c, Image1__c, Image2__c, 
                   Veg_NonVeg__c, Section__c, Total_Ordered__c
            FROM Custom_Dish__c
            WHERE CreatedDate >= LAST_N_DAYS:7
        """
        custom_dish_result = sf.query_all(custom_dish_query)
        custom_dishes = custom_dish_result.get('records', [])

        # Process custom dishes
        for item in custom_dishes:
            item['Total_Ordered__c'] = item.get('Total_Ordered__c', 0) or 0
            item['Video1__c'] = get_valid_video_path(item['Name'])
            item['Section__c'] = item.get('Section__c', "Customized dish")
            item['Description__c'] = item.get('Description__c', "No description available")
            item['is_menu_item'] = False  # Flag to identify Custom_Dish__c records

        # Merge all items
        all_items = food_items + custom_dishes
        ordered_menu = {section: [] for section in SECTION_ORDER}

        # Process best sellers
        best_sellers = sorted(all_items, key=lambda x: x['Total_Ordered__c'], reverse=True)
        if selected_category == "Veg":
            best_sellers = [item for item in best_sellers if item.get("Veg_NonVeg__c") in ["Veg", "both"]]
        elif selected_category == "Non veg":
            best_sellers = [item for item in best_sellers if item.get("Veg_NonVeg__c") in ["Non veg", "both"]]
        elif selected_category == "Customized Dish":
            best_sellers = [item for item in best_sellers if item.get("Section__c") == "Customized dish"]
        ordered_menu["Best Sellers"] = best_sellers[:4]

        # Organize items into sections
        added_item_names = set()
        for item in all_items:
            section = item['Section__c']
            if section not in ordered_menu:
                ordered_menu[section] = []

            if item['Name'] in added_item_names:
                continue

            veg_nonveg = item.get("Veg_NonVeg__c", "both")
            if selected_category == "Veg" and veg_nonveg not in ["Veg", "both"]:
                continue
            if selected_category == "Non veg" and veg_nonveg not in ["Non veg", "both"]:
                continue
            if selected_category == "Customized Dish" and section != "Customized dish":
                continue

            ordered_menu[section].append(item)
            added_item_names.add(item['Name'])

        # Remove empty sections
        ordered_menu = {section: items for section, items in ordered_menu.items() if items}

        # Fetch past orders for add-on and instruction analysis
        past_orders_query = f"""
            SELECT Order_Details__c FROM Order__c
            WHERE Customer_Email__c = '{user_email}'
        """
        past_orders_result = sf.query(past_orders_query)
        past_orders = past_orders_result.get('records', [])

        # Frequency analysis for add-ons and instructions
        addon_counts = {}
        instruction_counts = {}
        for order in past_orders:
            order_details = order.get('Order_Details__c', '').split('\n')
            for line in order_details:
                item_parts = line.split('|')
                if len(item_parts) >= 5:
                    addons = item_parts[1].strip().replace('Add-Ons:', '').split(', ')
                    instructions = item_parts[2].strip().replace('Instructions:', '').split(', ')
                    cleaned_addons = [re.sub(r"\s?\(\$\d+(\.\d{2})?\)", "", addon).strip() for addon in addons]
                    for addon in cleaned_addons:
                        individual_addons = addon.split(';')
                        for individual_addon in individual_addons:
                            individual_addon = individual_addon.strip()
                            if individual_addon:
                                addon_counts[individual_addon] = addon_counts.get(individual_addon, 0) + 1
                    for instruction in instructions:
                        instruction = instruction.strip()
                        if instruction:
                            instruction_counts[instruction] = instruction_counts.get(instruction, 0) + 1

        # Get most common add-ons and instructions (top 3)
        most_common_addons = sorted(addon_counts, key=addon_counts.get, reverse=True)[:3]
        most_common_instructions = sorted(instruction_counts, key=instruction_counts.get, reverse=True)[:3]

        return ordered_menu, referral_code, reward_points, cart_item_count, most_common_addons, most_common_instructions

    except Exception as e:
        print(f"Error fetching menu data: {str(e)}")
        return None, None, None, None, [], []

@menu_blueprint.route("/menu", methods=["GET", "POST"])
def menu():
    # Handle filter parameters
    selected_category = request.args.get("category", "All")
    is_veg_only = request.args.get("veg") == 'on'

    # Prioritize Customized Dish, then Veg, then All
    if request.args.get("category") == "Customized Dish":
        selected_category = "Customized Dish"
    else:
        selected_category = "Veg" if is_veg_only else "All"

    user_email = session.get('user_email')

    # Handle user authentication
    if not user_email:
        user_email = request.args.get("email")
        user_name = request.args.get("name")
        if user_email and user_name:
            session['user_email'] = user_email
            session['user_name'] = user_name
        else:
            return redirect(url_for("login"))
    else:
        user_name = session.get('user_name')

    first_letter = user_name[0].upper() if user_name else "A"

    # Fetch menu data
    ordered_menu, referral_code, reward_points, cart_item_count, most_common_addons, most_common_instructions = fetch_menu_data(selected_category, user_email)
    if ordered_menu is None:
        return redirect(url_for('login'))

    categories = ["All", "Veg", "Non veg", "Customized Dish"]

    return render_template(
        "menu.html",
        ordered_menu=ordered_menu,
        categories=categories,
        selected_category=selected_category,
        referral_code=referral_code,
        reward_points=reward_points,
        user_name=user_name,
        first_letter=first_letter,
        cart_item_count=cart_item_count,
        most_common_addons=[addon.strip() for addon in most_common_addons],
        most_common_instructions=most_common_instructions
    )

@menu_blueprint.route("/search", methods=["GET"])
def search():
    selected_category = request.args.get("category", "All")
    user_email = session.get('user_email')

    # Handle user authentication
    if not user_email:
        return redirect(url_for("login"))
    user_name = session.get('user_name')
    first_letter = user_name[0].upper() if user_name else "A"

    # Fetch menu data
    ordered_menu, referral_code, reward_points, cart_item_count, most_common_addons, most_common_instructions = fetch_menu_data(selected_category, user_email)
    if ordered_menu is None:
        return redirect(url_for('login'))

    return render_template(
        "search.html",
        ordered_menu=ordered_menu,
        user_name=user_name,
        first_letter=first_letter,
        cart_item_count=cart_item_count,
        most_common_addons=[addon.strip() for addon in most_common_addons],
        most_common_instructions=most_common_instructions
    )

@menu_blueprint.route('/api/addons', methods=['GET'])
def get_addons():
    item_name = request.args.get('item_name')
    item_section = request.args.get('item_section')

    if not item_name or not item_section:
        return jsonify({"success": False, "error": "Item name and section are required."}), 400

    try:
        query = f"""
            SELECT Name, Customization_Type__c, Options__c, Max_Selections__c, Extra_Charge__c, Extra_Charge_Amount__c
            FROM Customization_Options__c
            WHERE Section__c = '{item_section}'
        """
        result = sf.query_all(query)
        addons = result.get('records', [])

        if not addons:
            return jsonify({"success": False, "error": "No customization options found for the given section."}), 404

        formatted_addons = []
        for addon in addons:
            options = addon.get("Options__c", "")
            options = options.split(", ") if options else []
            formatted_addons.append({
                "name": addon.get("Name", ""),
                "type": addon.get("Customization_Type__c", ""),
                "options": options,
                "max_selections": addon.get("Max_Selections__c", 1),
                "extra_charge": addon.get("Extra_Charge__c", False),
                "extra_charge_amount": addon.get("Extra_Charge_Amount__c", 0)
            })

        return jsonify({"success": True, "addons": formatted_addons})

    except Exception as e:
        print(f"Error fetching addons: {str(e)}")
        return jsonify({"success": False, "error": "An error occurred while fetching customization options."}), 500

@menu_blueprint.route('/cart/add', methods=['POST'])
def add_to_cart():
    try:
        data = request.json
        item_name = data.get('itemName', '').strip()
        item_price = float(data.get('itemPrice', 0))
        item_image = data.get('itemImage', '')
        addons = data.get('addons', [])
        instructions = data.get('instructions', '')
        category = data.get('category', '')
        section = data.get('section', '')
        quantity = int(data.get('quantity', 1))
        customer_email = session.get('user_email')

        if not item_name or not item_price or not customer_email:
            return jsonify({"success": False, "error": "Item name, price, and user email are required."}), 400

        query = f"""
            SELECT Id, Quantity__c, Add_Ons__c, Add_Ons_Price__c, Instructions__c, Price__c
            FROM Cart_Item__c
            WHERE Customer_Email__c = '{customer_email}' AND Name = '{item_name}'
        """
        result = sf.query(query)
        cart_items = result.get("records", [])

        addons_price = sum(float(addon.get('price', 0)) for addon in addons)
        new_addons = "; ".join([f"{addon['name']} (${addon['price']})" for addon in addons]) if addons else "None"

        if cart_items:
            cart_item = cart_items[0]
            cart_item_id = cart_item['Id']
            existing_quantity = int(cart_item.get('Quantity__c', 0))
            existing_addons = cart_item.get('Add_Ons__c', "None")
            existing_addons_price = float(cart_item.get('Add_Ons_Price__c', 0))
            existing_instructions = cart_item.get('Instructions__c', "")

            combined_addons = existing_addons if existing_addons != "None" else ""
            if new_addons != "None":
                combined_addons = f"{combined_addons}; {new_addons}".strip("; ")

            combined_instructions = existing_instructions
            if instructions:
                combined_instructions = f"{existing_instructions} | {instructions}".strip(" | ")

            combined_addons_list = combined_addons.split("; ")
            combined_addons_price = sum(
                float(addon.split("($")[1][:-1]) for addon in combined_addons_list if "($" in addon
            )

            total_price = (existing_quantity + quantity) * item_price + combined_addons_price

            sf.Cart_Item__c.update(cart_item_id, {
                "Quantity__c": existing_quantity + quantity,
                "Add_Ons__c": combined_addons,
                "Add_Ons_Price__c": combined_addons_price,
                "Instructions__c": combined_instructions,
                "Price__c": total_price,
                "Category__c": category,
                "Section__c": section
            })
        else:
            total_price = item_price * quantity + addons_price
            sf.Cart_Item__c.create({
                "Name": item_name,
                "Price__c": total_price,
                "Base_Price__c": item_price,
                "Quantity__c": quantity,
                "Add_Ons_Price__c": addons_price,
                "Add_Ons__c": new_addons,
                "Image1__c": item_image,
                "Customer_Email__c": customer_email,
                "Instructions__c": instructions,
                "Category__c": category,
                "Section__c": section
            })

        # Fetch updated cart for UI update
        cart_query = f"SELECT Name, Quantity__c FROM Cart_Item__c WHERE Customer_Email__c = '{customer_email}'"
        cart_result = sf.query_all(cart_query)
        cart = [{"itemName": item["Name"], "quantity": item["Quantity__c"]} for item in cart_result.get("records", [])]
        
        return jsonify({"success": True, "message": "Item added to cart successfully.", "cart": cart})

    except ValueError as e:
        return jsonify({"success": False, "error": f"Invalid data format: {str(e)}"}), 400
    except Exception as e:
        print(f"Error adding item to cart: {str(e)}")
        return jsonify({"success": False, "error": "An error occurred while adding the item to the cart."}), 500