-- Migration: 025_create_erp_tables.sql
-- Description: Create tables for Finance, Inventory, and Order management

-- Financial Categories
CREATE TABLE IF NOT EXISTS erp_financial_categories (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    type VARCHAR(20) NOT NULL CHECK (type IN ('income', 'expense')),
    color VARCHAR(20),
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Bank Accounts
CREATE TABLE IF NOT EXISTS erp_bank_accounts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    bank_name VARCHAR(255),
    initial_balance DECIMAL(15,2) DEFAULT 0.00,
    current_balance DECIMAL(15,2) DEFAULT 0.00,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Financial Transactions
CREATE TABLE IF NOT EXISTS erp_financial_transactions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    account_id UUID REFERENCES erp_bank_accounts(id),
    category_id UUID REFERENCES erp_financial_categories(id),
    description TEXT,
    amount DECIMAL(15,2) NOT NULL,
    type VARCHAR(20) NOT NULL CHECK (type IN ('income', 'expense')),
    status VARCHAR(20) NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'paid', 'cancelled')),
    due_date DATE,
    payment_date TIMESTAMP WITH TIME ZONE,
    attachments TEXT[], -- URLs for proofs
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Products & Services
CREATE TABLE IF NOT EXISTS erp_products (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    sku VARCHAR(100),
    description TEXT,
    price DECIMAL(15,2) NOT NULL,
    cost_price DECIMAL(15,2),
    type VARCHAR(20) DEFAULT 'product' CHECK (type IN ('product', 'service')),
    stock_quantity INT DEFAULT 0,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Orders
CREATE TABLE IF NOT EXISTS erp_orders (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
    customer_id UUID REFERENCES companies(id), -- Linked to CRM (companies)
    status VARCHAR(20) NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'confirmed', 'completed', 'cancelled')),
    total_amount DECIMAL(15,2) DEFAULT 0.00,
    notes TEXT,
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Order Items
CREATE TABLE IF NOT EXISTS erp_order_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    order_id UUID NOT NULL REFERENCES erp_orders(id) ON DELETE CASCADE,
    product_id UUID NOT NULL REFERENCES erp_products(id),
    quantity INT NOT NULL DEFAULT 1,
    unit_price DECIMAL(15,2) NOT NULL,
    total_price DECIMAL(15,2) NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Indexes for performance and multi-tenancy
CREATE INDEX idx_erp_fin_cat_tenant ON erp_financial_categories(tenant_id);
CREATE INDEX idx_erp_bank_acc_tenant ON erp_bank_accounts(tenant_id);
CREATE INDEX idx_erp_fin_trans_tenant ON erp_financial_transactions(tenant_id);
CREATE INDEX idx_erp_products_tenant ON erp_products(tenant_id);
CREATE INDEX idx_erp_orders_tenant ON erp_orders(tenant_id);
CREATE INDEX idx_erp_order_items_order ON erp_order_items(order_id);