-- Sales & Stock v1 schema (MySQL 8+)
-- Create DB first: CREATE DATABASE sales_stock_v1 CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
-- Then: USE sales_stock_v1; SOURCE schema.sql;


CREATE TABLE IF NOT EXISTS warehouses (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(120) NOT NULL,
  is_active TINYINT(1) NOT NULL DEFAULT 1
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS items (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(200) NOT NULL,
  barcode VARCHAR(64) NULL UNIQUE,
  cost DECIMAL(12,2) NOT NULL DEFAULT 0,
  price DECIMAL(12,2) NOT NULL DEFAULT 0,
  is_active TINYINT(1) NOT NULL DEFAULT 1,
  created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS stock_balances (
  warehouse_id BIGINT UNSIGNED NOT NULL,
  item_id BIGINT UNSIGNED NOT NULL,
  qty DECIMAL(14,3) NOT NULL DEFAULT 0,
  PRIMARY KEY (warehouse_id, item_id),
  CONSTRAINT fk_sb_wh FOREIGN KEY (warehouse_id) REFERENCES warehouses(id),
  CONSTRAINT fk_sb_item FOREIGN KEY (item_id) REFERENCES items(id)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS sales_invoices (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  invoice_no VARCHAR(32) NOT NULL UNIQUE,
  invoice_date DATETIME NOT NULL,
  warehouse_id BIGINT UNSIGNED NOT NULL,
  total DECIMAL(12,2) NOT NULL DEFAULT 0,
  user_id BIGINT UNSIGNED NOT NULL,
  created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_si_wh FOREIGN KEY (warehouse_id) REFERENCES warehouses(id),
  CONSTRAINT fk_si_user FOREIGN KEY (user_id) REFERENCES users(id)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS sales_items (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  invoice_id BIGINT UNSIGNED NOT NULL,
  item_id BIGINT UNSIGNED NOT NULL,
  qty DECIMAL(14,3) NOT NULL,
  price DECIMAL(12,2) NOT NULL,
  cost DECIMAL(12,2) NOT NULL,
  line_total DECIMAL(12,2) NOT NULL,
  CONSTRAINT fk_sit_inv FOREIGN KEY (invoice_id) REFERENCES sales_invoices(id) ON DELETE CASCADE,
  CONSTRAINT fk_sit_item FOREIGN KEY (item_id) REFERENCES items(id)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS stock_moves (
  id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
  ref_type VARCHAR(20) NOT NULL, -- SALE / OPENING / ADJUST / TRANSFER etc.
  ref_id BIGINT UNSIGNED NOT NULL,
  warehouse_id BIGINT UNSIGNED NOT NULL,
  item_id BIGINT UNSIGNED NOT NULL,
  qty_in DECIMAL(14,3) NOT NULL DEFAULT 0,
  qty_out DECIMAL(14,3) NOT NULL DEFAULT 0,
  cost DECIMAL(12,2) NOT NULL DEFAULT 0,
  user_id BIGINT UNSIGNED NOT NULL,
  created_at TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_sm_wh FOREIGN KEY (warehouse_id) REFERENCES warehouses(id),
  CONSTRAINT fk_sm_item FOREIGN KEY (item_id) REFERENCES items(id),
  CONSTRAINT fk_sm_user FOREIGN KEY (user_id) REFERENCES users(id),
  INDEX idx_sm_item_date (item_id, created_at),
  INDEX idx_sm_wh_date (warehouse_id, created_at)
) ENGINE=InnoDB;

-- Seed data
INSERT INTO warehouses (name) VALUES ('Main Warehouse');
