-- MySql Version 9.2.0
CREATE DATABASE Marketplace;

Use Marketplace
-- User Entity
CREATE TABLE User (
    UserID INT AUTO_INCREMENT PRIMARY KEY,
    Name VARCHAR(100) NOT NULL,
    Email VARCHAR(100) UNIQUE NOT NULL,
    UCID VARCHAR(20) UNIQUE NOT NULL,
    Password VARCHAR(255) NOT NULL,
    Phone VARCHAR(20),
    Address VARCHAR(255)
);

CREATE TABLE UserRole (
    UserID INT,
    Client BOOLEAN DEFAULT True,
    Admin BOOLEAN DEFAULT FALSE,
    PRIMARY KEY (UserID),
    FOREIGN KEY (UserID) REFERENCES User (UserID) ON DELETE CASCADE
);

-- Category Entity  (must be created before Product or else error)
CREATE TABLE Category (
    CategoryID INT PRIMARY KEY,
    Name VARCHAR(255) NOT NULL
);

-- Product Entity
CREATE TABLE Product (
    ProductID INT PRIMARY KEY,
    Name VARCHAR(255) NOT NULL,
    Price DECIMAL(10, 2) NOT NULL,
    StockQuantity INT,
    UserID INT,
    Description TEXT,
    CategoryID INT NOT NULL,
    Date DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (CategoryID) REFERENCES Category (CategoryID)
);

CREATE TABLE Image_URL (
    URL VARCHAR(255),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
)
-- Review Entity (Many-to-One with User, Many-to-One with Product)
CREATE TABLE Review (
    ReviewID INT PRIMARY KEY,
    UserID INT,
    ProductID INT,
    Comment TEXT,
    Rating INT CHECK (
        Rating >= 1
        AND Rating <= 5
    ),
    Date DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
);

-- Transaction Entity (Many-to-One with User, Many-to-One with Product)
CREATE TABLE Transaction (
    TransactionID INT PRIMARY KEY,
    UserID INT,
    ProductID INT,
    Date DATETIME DEFAULT CURRENT_TIMESTAMP,
    PaymentStatus VARCHAR(50),
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
);

-- Recommendation Entity (Many-to-One with User, Many-to-One with Product)
CREATE TABLE Recommendation (
    RecommendationID_PK INT PRIMARY KEY,
    UserID INT,
    RecommendedProductID INT,
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (RecommendedProductID) REFERENCES Product (ProductID)
);

-- History Entity (Many-to-One with User, Many-to-One with Product)
CREATE TABLE History (
    HistoryID INT PRIMARY KEY,
    UserID INT,
    ProductID INT,
    Date DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
);

-- Favorites Entity (Many-to-One with User, Many-to-One with Product)
CREATE TABLE Favorites (
    FavoriteID INT AUTO_INCREMENT PRIMARY KEY,
    UserID INT,
    ProductID INT,
    FOREIGN KEY (UserID) REFERENCES User (UserID),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
);

-- Product-Category Junction Table (Many-to-Many)
CREATE TABLE Product_Category (
    ProductID INT,
    CategoryID INT,
    PRIMARY KEY (ProductID, CategoryID),
    FOREIGN KEY (ProductID) REFERENCES Product (ProductID),
    FOREIGN KEY (CategoryID) REFERENCES Category (CategoryID)
);

-- Login Authentication table, Store the userID,and a emailed code of user who have not authenticated,
CREATE TABLE AuthVerification (
    UserID INT AUTO_INCREMENT PRIMARY KEY,
    Email VARCHAR(100) UNIQUE NOT NULL,
    VerificationCode VARCHAR(6) NOT NULL,
    Authenticated BOOLEAN DEFAULT FALSE,
    Date DATETIME DEFAULT CURRENT_TIMESTAMP
);

-- Insert sample categories
INSERT INTO
    Category (CategoryID, Name)
VALUES
    (1, 'Electronics'),
    (2, 'Clothing'),
    (3, 'Books'),
    (4, 'Home & Garden'),
    (5, 'Sports & Outdoors');

-- USER CRUD OPERATIONS
-- Create User (INSERT)
INSERT INTO
    User (Name, Email, UCID, Password, Phone, Address)
VALUES
    (
        'John Doe',
        'john@example.com',
        'UC123456',
        'hashed_password_here',
        '555-123-4567',
        '123 Main St'
    );

-- Set user role
INSERT INTO
    UserRole (UserID, Client, Admin)
VALUES
    (LAST_INSERT_ID (), TRUE, FALSE);

-- Read User (SELECT)
SELECT
    u.*,
    ur.Client,
    ur.Admin
FROM
    User u
    JOIN UserRole ur ON u.UserID = ur.UserID
WHERE
    u.UserID = 1;

-- Update User (UPDATE)
UPDATE User
SET
    Name = 'John Smith',
    Phone = '555-987-6543',
    Address = '456 Elm St'
WHERE
    UserID = 1;

-- Update User Role
UPDATE UserRole
SET
    Admin = TRUE
WHERE
    UserID = 1;

-- Delete User (DELETE)
DELETE FROM User
WHERE
    UserID = 1;

-- Note: Cascade will delete related UserRole record
-- PRODUCT CRUD OPERATIONS
-- Create Product (INSERT)
INSERT INTO
    Product (
        ProductID,
        Name,
        Price,
        StockQuantity,
        UserID,
        Description,
        CategoryID
    )
VALUES
    (
        1,
        'Smartphone',
        599.99,
        50,
        1,
        'Latest model smartphone with amazing features',
        1
    );

-- Add product images
INSERT INTO
    Image_URL (URL, ProductID)
VALUES
    ('https://example.com/images/smartphone1.jpg', 1),
    ('https://example.com/images/smartphone2.jpg', 1);

-- Read Product (SELECT)
SELECT
    p.*,
    c.Name as CategoryName,
    u.Name as SellerName,
    i.URL as ImageURL
FROM
    Product p
    JOIN Category c ON p.CategoryID = c.CategoryID
    JOIN User u ON p.UserID = u.UserID
    LEFT JOIN Image_URL i ON p.ProductID = i.ProductID
WHERE
    p.ProductID = 1;

-- Update Product (UPDATE)
UPDATE Product
SET
    Name = 'Premium Smartphone',
    Price = 649.99,
    StockQuantity = 45,
    Description = 'Updated description with new features'
WHERE
    ProductID = 1;

-- Delete Product (DELETE)
DELETE FROM Product
WHERE
    ProductID = 1;

-- CATEGORY CRUD OPERATIONS (Admin only for delete)
-- Create Category (INSERT)
INSERT INTO
    Category (CategoryID, Name)
VALUES
    (6, 'Toys & Games');

-- Read Category (SELECT)
SELECT
    *
FROM
    Category
WHERE
    CategoryID = 6;

-- Update Category (UPDATE)
UPDATE Category
SET
    Name = 'Toys & Children''s Games'
WHERE
    CategoryID = 6;

-- Delete Category (DELETE) - Admin only
DELETE FROM Category
WHERE
    CategoryID = 6;

-- REVIEW OPERATIONS (Create only as specified)
-- Create Review (INSERT)
INSERT INTO
    Review (ReviewID, UserID, ProductID, Comment, Rating)
VALUES
    (
        1,
        1,
        1,
        'Great product, very satisfied with the purchase!',
        5
    );

-- TRANSACTION OPERATIONS (Create only as specified)
-- Create Transaction (INSERT)
INSERT INTO
    Transaction (TransactionID, UserID, ProductID, PaymentStatus)
VALUES
    (1, 1, 1, 'Completed');

-- HISTORY CRUD OPERATIONS
-- Create History (INSERT)
INSERT INTO
    History (HistoryID, UserID, ProductID)
VALUES
    (1, 1, 1);

-- Read History (SELECT)
SELECT
    h.*,
    p.Name as ProductName
FROM
    History h
    JOIN Product p ON h.ProductID = p.ProductID
WHERE
    h.UserID = 1
ORDER BY
    h.Date DESC;

-- Delete History (DELETE)
DELETE FROM History
WHERE
    HistoryID = 1;

-- FAVORITES CRUD OPERATIONS
-- Create Favorite (INSERT)
INSERT INTO
    Favorites (UserID, ProductID)
VALUES
    (1, 1);

-- Read Favorites (SELECT)
SELECT
    f.*,
    p.Name as ProductName,
    p.Price
FROM
    Favorites f
    JOIN Product p ON f.ProductID = p.ProductID
WHERE
    f.UserID = 1;

-- Delete Favorite (DELETE)
DELETE FROM Favorites
WHERE
    FavoriteID = 1;

-- RECOMMENDATION SYSTEM OPERATIONS
-- Create Recommendation (INSERT)
INSERT INTO
    Recommendation (RecommendationID_PK, UserID, RecommendedProductID)
VALUES
    (1, 1, 2);

-- Read Recommendations (SELECT)
SELECT
    r.*,
    p.Name as RecommendedProductName,
    p.Price,
    p.Description
FROM
    Recommendation r
    JOIN Product p ON r.RecommendedProductID = p.ProductID
WHERE
    r.UserID = 1;

-- Update Recommendation (UPDATE)
UPDATE Recommendation
SET
    RecommendedProductID = 3
WHERE
    RecommendationID_PK = 1;

-- Delete Recommendation (DELETE)
DELETE FROM Recommendation
WHERE
    RecommendationID_PK = 1;

-- Authentication Operations
-- Create verification code
INSERT INTO
    AuthVerification (Email, VerificationCode)
VALUES
    ('new_user@example.com', '123456');

-- Update authentication status
UPDATE AuthVerification
SET
    Authenticated = TRUE
WHERE
    Email = 'new_user@example.com'
    AND VerificationCode = '123456';

-- Complex Queries for Reports and Analysis
-- Get top-selling products
SELECT
    p.ProductID,
    p.Name,
    COUNT(t.TransactionID) as SalesCount,
    SUM(p.Price) as TotalRevenue
FROM
    Product p
    JOIN Transaction t ON p.ProductID = t.ProductID
WHERE
    t.PaymentStatus = 'Completed'
GROUP BY
    p.ProductID,
    p.Name
ORDER BY
    SalesCount DESC
LIMIT
    10;

-- Get highest-rated products
SELECT
    p.ProductID,
    p.Name,
    AVG(r.Rating) as AverageRating,
    COUNT(r.ReviewID) as ReviewCount
FROM
    Product p
    JOIN Review r ON p.ProductID = r.ProductID
GROUP BY
    p.ProductID,
    p.Name
HAVING
    ReviewCount >= 5
ORDER BY
    AverageRating DESC
LIMIT
    10;

-- Get user purchase history with product details
SELECT
    t.TransactionID,
    t.Date,
    p.Name,
    p.Price,
    t.PaymentStatus
FROM
    Transaction t
    JOIN Product p ON t.ProductID = p.ProductID
WHERE
    t.UserID = 1
ORDER BY
    t.Date DESC;