package database

import (
	"context"

	"github.com/jackc/pgx/v5/pgxpool"
)

func Migrate(ctx context.Context, pool *pgxpool.Pool) error {
	queries := []string{
		`CREATE TABLE IF NOT EXISTS admins (
			id            SERIAL PRIMARY KEY,
			email         VARCHAR(255) UNIQUE NOT NULL,
			password_hash VARCHAR(255) NOT NULL,
			created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS details TEXT NOT NULL DEFAULT ''`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS is_active BOOLEAN NOT NULL DEFAULT true`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()`,
		`CREATE TABLE IF NOT EXISTS product_images (
			id          SERIAL PRIMARY KEY,
			product_id  INT NOT NULL REFERENCES products(id) ON DELETE CASCADE,
			file_path   VARCHAR(512) NOT NULL,
			is_primary  BOOLEAN NOT NULL DEFAULT false,
			sort_order  INT NOT NULL DEFAULT 0,
			created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE INDEX IF NOT EXISTS idx_product_images_product ON product_images (product_id)`,
		`CREATE TABLE IF NOT EXISTS site_stats (
			id           INT PRIMARY KEY DEFAULT 1 CHECK (id = 1),
			total_visits BIGINT NOT NULL DEFAULT 0,
			today_visits INT NOT NULL DEFAULT 0,
			visit_date   DATE NOT NULL DEFAULT CURRENT_DATE
		)`,
		`INSERT INTO site_stats (id) VALUES (1) ON CONFLICT (id) DO NOTHING`,
		`CREATE TABLE IF NOT EXISTS users (
			id SERIAL PRIMARY KEY,
			email VARCHAR(255) UNIQUE NOT NULL,
			password_hash VARCHAR(255) NOT NULL,
			name VARCHAR(255) NOT NULL DEFAULT '',
			phone VARCHAR(50) NOT NULL DEFAULT '',
			address TEXT NOT NULL DEFAULT '',
			created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE TABLE IF NOT EXISTS carts (
			id SERIAL PRIMARY KEY,
			user_id INT REFERENCES users(id) ON DELETE CASCADE,
			session_key VARCHAR(64) NOT NULL DEFAULT '',
			updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE UNIQUE INDEX IF NOT EXISTS idx_carts_user ON carts (user_id) WHERE user_id IS NOT NULL`,
		`CREATE UNIQUE INDEX IF NOT EXISTS idx_carts_session ON carts (session_key) WHERE user_id IS NULL`,
		`CREATE TABLE IF NOT EXISTS cart_items (
			id SERIAL PRIMARY KEY,
			cart_id INT NOT NULL REFERENCES carts(id) ON DELETE CASCADE,
			product_id INT NOT NULL REFERENCES products(id) ON DELETE CASCADE,
			quantity INT NOT NULL DEFAULT 1 CHECK (quantity > 0),
			UNIQUE (cart_id, product_id)
		)`,
		`CREATE TABLE IF NOT EXISTS orders (
			id SERIAL PRIMARY KEY,
			user_id INT REFERENCES users(id) ON DELETE SET NULL,
			guest_name VARCHAR(255) NOT NULL DEFAULT '',
			guest_email VARCHAR(255) NOT NULL DEFAULT '',
			guest_phone VARCHAR(50) NOT NULL DEFAULT '',
			address TEXT NOT NULL DEFAULT '',
			total NUMERIC(10,2) NOT NULL DEFAULT 0,
			status VARCHAR(50) NOT NULL DEFAULT 'new',
			created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE TABLE IF NOT EXISTS order_items (
			id SERIAL PRIMARY KEY,
			order_id INT NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
			product_id INT NOT NULL,
			product_name VARCHAR(255) NOT NULL,
			price NUMERIC(10,2) NOT NULL,
			quantity INT NOT NULL CHECK (quantity > 0)
		)`,
		`CREATE INDEX IF NOT EXISTS idx_orders_user ON orders (user_id)`,
		`CREATE TABLE IF NOT EXISTS categories (
			id SERIAL PRIMARY KEY,
			name VARCHAR(100) NOT NULL UNIQUE,
			slug VARCHAR(100) NOT NULL UNIQUE,
			description TEXT NOT NULL DEFAULT '',
			sort_order INT NOT NULL DEFAULT 0,
			created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS category_id INT REFERENCES categories(id) ON DELETE SET NULL`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS sale_price NUMERIC(10,2)`,
		`INSERT INTO categories (name, slug, sort_order) VALUES
			('Электроника', 'elektronika', 1),
			('Одежда', 'odezhda', 2),
			('Дом и сад', 'dom-i-sad', 3),
			('Аксессуары', 'aksessuary', 4),
			('Разное', 'raznoe', 5)
		ON CONFLICT (slug) DO NOTHING`,
		`UPDATE products p SET category_id = c.id
		 FROM categories c WHERE p.category = c.name AND p.category_id IS NULL`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS attr_size VARCHAR(50) NOT NULL DEFAULT ''`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS attr_color VARCHAR(50) NOT NULL DEFAULT ''`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS attr_material VARCHAR(100) NOT NULL DEFAULT ''`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS attr_weight VARCHAR(50) NOT NULL DEFAULT ''`,
		`ALTER TABLE products ADD COLUMN IF NOT EXISTS attr_brand VARCHAR(100) NOT NULL DEFAULT ''`,
		`CREATE TABLE IF NOT EXISTS product_price_history (
			id SERIAL PRIMARY KEY,
			product_id INT NOT NULL REFERENCES products(id) ON DELETE CASCADE,
			price NUMERIC(10,2) NOT NULL,
			sale_price NUMERIC(10,2),
			recorded_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE INDEX IF NOT EXISTS idx_price_history_product ON product_price_history (product_id, recorded_at DESC)`,
		`CREATE TABLE IF NOT EXISTS product_reservations (
			id SERIAL PRIMARY KEY,
			product_id INT NOT NULL REFERENCES products(id) ON DELETE CASCADE,
			session_key VARCHAR(64) NOT NULL DEFAULT '',
			user_id INT REFERENCES users(id) ON DELETE SET NULL,
			customer_name VARCHAR(255) NOT NULL DEFAULT '',
			customer_phone VARCHAR(50) NOT NULL DEFAULT '',
			expires_at TIMESTAMPTZ NOT NULL,
			created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
		)`,
		`CREATE INDEX IF NOT EXISTS idx_reservations_product ON product_reservations (product_id, expires_at DESC)`,
		`CREATE INDEX IF NOT EXISTS idx_reservations_session ON product_reservations (session_key)`,
		`ALTER TABLE orders ADD COLUMN IF NOT EXISTS payment_method VARCHAR(20) NOT NULL DEFAULT 'cod'`,
		`ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_uuid VARCHAR(64) NOT NULL DEFAULT ''`,
		`ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_order_id VARCHAR(128) NOT NULL DEFAULT ''`,
		`ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_payment_url TEXT NOT NULL DEFAULT ''`,
		`ALTER TABLE orders ADD COLUMN IF NOT EXISTS heleket_payment_status VARCHAR(50) NOT NULL DEFAULT ''`,
	}

	for _, q := range queries {
		if _, err := pool.Exec(ctx, q); err != nil {
			return err
		}
	}
	return nil
}