CREATE EXTENSION IF NOT EXISTS pgcrypto;

CREATE TABLE users (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  name text NOT NULL,
  email text NOT NULL UNIQUE,
  password_hash text NOT NULL,
  avatar_file text,
  created_at timestamptz NOT NULL DEFAULT NOW(),
  updated_at timestamptz NOT NULL DEFAULT NOW()
);

CREATE TABLE sessions (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token_hash text NOT NULL UNIQUE,
  expires_at timestamptz NOT NULL,
  created_at timestamptz NOT NULL DEFAULT NOW()
);
CREATE INDEX sessions_user_id_idx ON sessions(user_id);
CREATE INDEX sessions_expires_at_idx ON sessions(expires_at);

CREATE TABLE subscriptions (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title text NOT NULL,
  amount double precision NOT NULL,
  billing_cycle text NOT NULL,
  activation_date text NOT NULL,
  first_payment_date text NOT NULL,
  end_date text,
  occurrence_count integer CHECK (occurrence_count > 0),
  custom_interval_value integer CHECK (custom_interval_value > 0),
  custom_interval_unit text CHECK (
    custom_interval_unit IN ('days', 'weeks', 'months', 'years')
  ),
  subscription_status text NOT NULL,
  created_at text NOT NULL,
  updated_at text NOT NULL,
  CONSTRAINT subscriptions_amount_positive CHECK (amount > 0),
  CONSTRAINT subscriptions_billing_cycle_valid CHECK (
    billing_cycle IN ('weekly', 'monthly', 'yearly', 'custom')
  ),
  CONSTRAINT subscriptions_status_valid CHECK (
    subscription_status IN ('active', 'suspended', 'terminated')
  ),
  CONSTRAINT subscriptions_dates_valid CHECK (
    activation_date <= first_payment_date
    AND (end_date IS NULL OR end_date >= first_payment_date)
  )
);
CREATE INDEX subscriptions_user_id_idx ON subscriptions(user_id);
CREATE INDEX subscriptions_first_payment_date_idx ON subscriptions(first_payment_date);

CREATE TABLE subscription_payments (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  subscription_id uuid NOT NULL REFERENCES subscriptions(id) ON DELETE CASCADE,
  renewal_date text NOT NULL,
  status text NOT NULL,
  payment_date text,
  linked_payment_id uuid,
  created_at text NOT NULL,
  updated_at text NOT NULL,
  UNIQUE (subscription_id, renewal_date, user_id)
);
CREATE INDEX subscription_payments_user_id_idx ON subscription_payments(user_id);

CREATE TABLE bills (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title text NOT NULL,
  amount double precision NOT NULL,
  due_date text NOT NULL,
  status text NOT NULL,
  payment_date text,
  linked_payment_id uuid,
  created_at text NOT NULL,
  updated_at text NOT NULL
);
CREATE INDEX bills_user_id_idx ON bills(user_id);
CREATE INDEX bills_due_date_idx ON bills(due_date);

CREATE TABLE one_time_payments (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title text NOT NULL,
  amount double precision NOT NULL,
  date text NOT NULL,
  linked_payment_id uuid,
  created_at text NOT NULL,
  updated_at text NOT NULL
);
CREATE INDEX one_time_payments_user_id_idx ON one_time_payments(user_id);

CREATE TABLE payments_ledger (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title text NOT NULL,
  amount double precision NOT NULL,
  date text NOT NULL,
  source_type text NOT NULL,
  source_id uuid NOT NULL,
  created_at text NOT NULL,
  updated_at text NOT NULL,
  UNIQUE (source_type, source_id, user_id)
);
CREATE INDEX payments_ledger_user_id_idx ON payments_ledger(user_id);
CREATE INDEX payments_ledger_date_idx ON payments_ledger(date);

CREATE TABLE payment_titles (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  name text NOT NULL,
  normalized_name text NOT NULL,
  payment_type text NOT NULL,
  created_at text NOT NULL,
  updated_at text NOT NULL,
  CONSTRAINT payment_titles_type_valid CHECK (
    payment_type IN ('subscription', 'bill', 'one_time', 'income', 'any')
  ),
  UNIQUE (user_id, normalized_name, payment_type)
);
CREATE INDEX payment_titles_user_id_idx ON payment_titles(user_id);

CREATE TABLE income (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  title text NOT NULL,
  amount double precision NOT NULL,
  type text NOT NULL,
  date text NOT NULL,
  created_at text NOT NULL,
  updated_at text NOT NULL
);
CREATE INDEX income_user_id_idx ON income(user_id);

CREATE TABLE user_settings (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id uuid NOT NULL UNIQUE REFERENCES users(id) ON DELETE CASCADE,
  full_name text,
  monthly_income_goal double precision,
  monthly_savings_goal double precision,
  currency text NOT NULL,
  locale text NOT NULL,
  first_day_of_week text NOT NULL,
  default_dashboard_view text NOT NULL,
  created_at text NOT NULL,
  updated_at text NOT NULL
);