-- =====================================================
-- WooCommerce GUEST Checkout to Saleor Migration
-- =====================================================
-- For stores without customer accounts - all data is in orders

-- Since there are no customer accounts, we create users from order data
-- Strategy: Create a Saleor user for each unique email in orders

-- Step 1: Create mapping table for email-based customers
CREATE TABLE IF NOT EXISTS wc_guest_customer_mapping (
    email VARCHAR(255) PRIMARY KEY,
    saleor_user_id UUID,
    first_name VARCHAR(255),
    last_name VARCHAR(255),
    phone VARCHAR(255),
    order_count INTEGER DEFAULT 0,
    total_spent DECIMAL(12,2) DEFAULT 0,
    created_at TIMESTAMP DEFAULT NOW()
);

-- Step 2: Export unique customers from orders (no wp_users needed!)
-- Run this on WordPress/MariaDB:
/*
SELECT DISTINCT
    meta_email.meta_value as email,
    MAX(meta_first.meta_value) as first_name,
    MAX(meta_last.meta_value) as last_name,
    MAX(meta_phone.meta_value) as phone,
    COUNT(DISTINCT p.ID) as order_count,
    SUM(CAST(meta_total.meta_value AS DECIMAL(12,2))) as total_spent
FROM wp_posts p
JOIN wp_postmeta meta_email ON p.ID = meta_email.post_id AND meta_email.meta_key = '_billing_email'
LEFT JOIN wp_postmeta meta_first ON p.ID = meta_first.post_id AND meta_first.meta_key = '_billing_first_name'
LEFT JOIN wp_postmeta meta_last ON p.ID = meta_last.post_id AND meta_last.meta_key = '_billing_last_name'
LEFT JOIN wp_postmeta meta_phone ON p.ID = meta_phone.post_id AND meta_phone.meta_key = '_billing_phone'
LEFT JOIN wp_postmeta meta_total ON p.ID = meta_total.post_id AND meta_total.meta_key = '_order_total'
WHERE p.post_type = 'shop_order'
AND meta_email.meta_value IS NOT NULL
AND meta_email.meta_value != ''
GROUP BY meta_email.meta_value
ORDER BY order_count DESC;
*/

-- Step 3: Insert guest customers into Saleor
-- For each unique email, create a user account

/*
WITH new_guest_user AS (
    INSERT INTO account_user (
        id, email, first_name, last_name,
        is_staff, is_active, date_joined,
        last_login, password
    ) VALUES (
        gen_random_uuid(),
        'customer@example.com',     -- from order billing_email
        'John',                      -- from order billing_first_name
        'Doe',                       -- from order billing_last_name
        false,
        true,
        NOW(),                       -- use first order date if available
        NULL,
        '!'                          -- unusable password - customer must set via password reset
    )
    RETURNING id, email
)
INSERT INTO wc_guest_customer_mapping (email, saleor_user_id, first_name, last_name)
SELECT email, id, 'John', 'Doe' FROM new_guest_user;
*/

-- Step 4: Create addresses from most recent order per customer
-- Get the most recent order for each email to extract address

/*
WITH latest_orders AS (
    SELECT DISTINCT ON (meta_email.meta_value)
        meta_email.meta_value as email,
        p.ID as order_id,
        p.post_date as order_date
    FROM wp_posts p
    JOIN wp_postmeta meta_email ON p.ID = meta_email.post_id AND meta_email.meta_key = '_billing_email'
    WHERE p.post_type = 'shop_order'
    ORDER BY meta_email.meta_value, p.post_date DESC
),
address_data AS (
    SELECT 
        lo.email,
        MAX(CASE WHEN pm.meta_key = '_billing_first_name' THEN pm.meta_value END) as bill_first,
        MAX(CASE WHEN pm.meta_key = '_billing_last_name' THEN pm.meta_value END) as bill_last,
        MAX(CASE WHEN pm.meta_key = '_billing_company' THEN pm.meta_value END) as bill_company,
        MAX(CASE WHEN pm.meta_key = '_billing_address_1' THEN pm.meta_value END) as bill_addr1,
        MAX(CASE WHEN pm.meta_key = '_billing_address_2' THEN pm.meta_value END) as bill_addr2,
        MAX(CASE WHEN pm.meta_key = '_billing_city' THEN pm.meta_value END) as bill_city,
        MAX(CASE WHEN pm.meta_key = '_billing_postcode' THEN pm.meta_value END) as bill_postcode,
        MAX(CASE WHEN pm.meta_key = '_billing_country' THEN pm.meta_value END) as bill_country,
        MAX(CASE WHEN pm.meta_key = '_billing_phone' THEN pm.meta_value END) as bill_phone,
        MAX(CASE WHEN pm.meta_key = '_shipping_first_name' THEN pm.meta_value END) as ship_first,
        MAX(CASE WHEN pm.meta_key = '_shipping_last_name' THEN pm.meta_value END) as ship_last,
        MAX(CASE WHEN pm.meta_key = '_shipping_company' THEN pm.meta_value END) as ship_company,
        MAX(CASE WHEN pm.meta_key = '_shipping_address_1' THEN pm.meta_value END) as ship_addr1,
        MAX(CASE WHEN pm.meta_key = '_shipping_address_2' THEN pm.meta_value END) as ship_addr2,
        MAX(CASE WHEN pm.meta_key = '_shipping_city' THEN pm.meta_value END) as ship_city,
        MAX(CASE WHEN pm.meta_key = '_shipping_postcode' THEN pm.meta_value END) as ship_postcode,
        MAX(CASE WHEN pm.meta_key = '_shipping_country' THEN pm.meta_value END) as ship_country
    FROM latest_orders lo
    JOIN wp_postmeta pm ON lo.order_id = pm.post_id
    GROUP BY lo.email
)
-- Insert billing address and link to user
INSERT INTO account_address (id, first_name, last_name, company_name, 
    street_address_1, street_address_2, city, postal_code, country, phone)
SELECT 
    gen_random_uuid(),
    bill_first, bill_last, COALESCE(bill_company, ''),
    bill_addr1, COALESCE(bill_addr2, ''), bill_city, 
    bill_postcode, COALESCE(bill_country, 'RS'), COALESCE(bill_phone, '')
FROM address_data ad
JOIN wc_guest_customer_mapping cm ON ad.email = cm.email
WHERE cm.saleor_user_id IS NOT NULL
RETURNING id, (SELECT email FROM wc_guest_customer_mapping WHERE saleor_user_id = 
    (SELECT id FROM account_user WHERE id = account_address.id));  -- This needs adjustment

-- Then link addresses to users via account_user_addresses
*/

-- Alternative simpler approach: Insert order with addresses inline (no separate customer record)
-- Saleor supports orders without user accounts (guest orders)

-- =====================================================
-- SIMPLIFIED: Orders Only (No Customer Accounts)
-- =====================================================
-- If you don't want to create customer accounts at all,
-- just migrate orders as guest orders with email addresses

/*
INSERT INTO order_order (
    id, created_at, updated_at, status,
    user_email,                    -- Store email here (no user_id)
    user_id,                       -- NULL for guest orders
    currency, total_gross_amount, total_net_amount,
    shipping_price_gross_amount, shipping_price_net_amount,
    shipping_method_name, channel_id,
    billing_address,               -- JSON with full address
    shipping_address,              -- JSON with full address
    metadata, origin,
    should_refresh_prices, tax_exemption,
    discount_amount, display_gross_prices,
    customer_note
) VALUES (
    gen_random_uuid(),
    '2024-01-15 10:30:00'::timestamp,
    '2024-01-15 10:30:00'::timestamp,
    'FULFILLED',
    'guest@example.com',           -- Customer email from order
    NULL,                          -- No user account (guest order)
    'RSD',
    11500.00,
    10000.00,
    500.00,
    500.00,
    'Flat Rate',
    (SELECT id FROM channel_channel WHERE slug = 'default-channel'),
    '{
        "first_name": "John",
        "last_name": "Doe",
        "street_address_1": "Kneza Milosa 10",
        "city": "Belgrade",
        "postal_code": "11000",
        "country": "RS",
        "phone": "+38164123456"
    }'::jsonb,
    '{
        "first_name": "John",
        "last_name": "Doe",
        "street_address_1": "Kneza Milosa 10",
        "city": "Belgrade",
        "postal_code": "11000",
        "country": "RS",
        "phone": "+38164123456"
    }'::jsonb,
    '{"woo_order_id": "12345", "guest_checkout": true}'::jsonb,
    'BULK_CREATE',
    false,
    false,
    0.00,
    true,
    ''
);
*/

-- =====================================================
-- RECOMMENDED APPROACH: Hybrid
-- =====================================================
-- 1. Create lightweight user accounts from unique emails
-- 2. Link all orders to these accounts
-- 3. Customers can claim accounts via password reset

-- Benefits:
-- - Order history tied to email
-- - Customers can "activate" their account later
-- - Better analytics (LTV per customer)
-- - Future marketing (targeted emails)