-- Migration 004: Create account hierarchy tables
-- Account: business entity under a Customer
-- AccountAddress: location (where work happens)
-- AccountContact: contact person at account (exactly ONE active per account)

-- Business entity under a customer
CREATE TABLE accounts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    customer_id UUID NOT NULL REFERENCES customers(id) ON DELETE CASCADE,

    name VARCHAR(200) NOT NULL,
    status entity_status NOT NULL DEFAULT 'ACTIVE',

    start_date DATE NOT NULL,
    end_date DATE
);

-- Physical locations for accounts (where work happens)
CREATE TABLE account_addresses (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    account_id UUID NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,

    name VARCHAR(200) NOT NULL,
    street_address VARCHAR(255) NOT NULL,
    city VARCHAR(100) NOT NULL,
    state VARCHAR(100) NOT NULL,
    zip_code VARCHAR(20) NOT NULL,

    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    is_primary BOOLEAN NOT NULL DEFAULT FALSE,

    notes TEXT
);

-- Contact persons at accounts
CREATE TABLE account_contacts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    account_id UUID NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,

    first_name VARCHAR(100) NOT NULL,
    last_name VARCHAR(100) NOT NULL,
    phone VARCHAR(20),
    email VARCHAR(254) NOT NULL,

    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    is_primary BOOLEAN NOT NULL DEFAULT FALSE,

    notes TEXT
);

-- Constraint: exactly ONE active contact per account
CREATE UNIQUE INDEX idx_account_contact_active
    ON account_contacts (account_id) WHERE is_active = TRUE;

-- Indexes
CREATE INDEX idx_accounts_customer ON accounts(customer_id);
CREATE INDEX idx_accounts_status ON accounts(status);
CREATE INDEX idx_account_addresses_account ON account_addresses(account_id);
CREATE INDEX idx_account_contacts_account ON account_contacts(account_id);