-- Initial schema for ERP MVP
-- Migration: 001_initial_schema.sql

-- Enable UUID extension
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- Organizations table
CREATE TABLE organizations (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(255) NOT NULL,
    type VARCHAR(100),
    settings JSONB,
    created_at TIMESTAMP DEFAULT NOW()
);

-- Users table
CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    role VARCHAR(50) DEFAULT 'user',
    created_at TIMESTAMP DEFAULT NOW()
);

-- Storage locations table
CREATE TABLE storage_locations (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
    parent_id UUID REFERENCES storage_locations(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    address VARCHAR(100) NOT NULL,
    type VARCHAR(50) NOT NULL,
    coordinates JSONB,
    created_at TIMESTAMP DEFAULT NOW()
);

-- Items table
CREATE TABLE items (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    category VARCHAR(100),
    created_at TIMESTAMP DEFAULT NOW()
);

-- Item placements table
CREATE TABLE item_placements (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
    item_id UUID REFERENCES items(id) ON DELETE CASCADE,
    location_id UUID REFERENCES storage_locations(id) ON DELETE CASCADE,
    quantity INTEGER DEFAULT 1,
    created_at TIMESTAMP DEFAULT NOW()
);

-- Indexes for better performance
CREATE INDEX idx_users_organization_id ON users(organization_id);
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_storage_locations_organization_id ON storage_locations(organization_id);
CREATE INDEX idx_storage_locations_parent_id ON storage_locations(parent_id);
CREATE INDEX idx_storage_locations_address ON storage_locations(address);
CREATE INDEX idx_items_organization_id ON items(organization_id);
CREATE INDEX idx_items_name ON items(name);
CREATE INDEX idx_items_category ON items(category);
CREATE INDEX idx_item_placements_organization_id ON item_placements(organization_id);
CREATE INDEX idx_item_placements_item_id ON item_placements(item_id);
CREATE INDEX idx_item_placements_location_id ON item_placements(location_id);

-- Unique constraints
CREATE UNIQUE INDEX idx_storage_locations_org_address ON storage_locations(organization_id, address);