-- App configuration (key/value store)
CREATE TABLE IF NOT EXISTS config (
  key   TEXT PRIMARY KEY,
  value TEXT NOT NULL
);

-- Seed default config
INSERT INTO config (key, value) VALUES
  ('paycheck1_day', '1'),
  ('paycheck2_day', '15'),
  ('paycheck1_gross', '0'),
  ('paycheck1_net', '0'),
  ('paycheck2_gross', '0'),
  ('paycheck2_net', '0')
ON CONFLICT (key) DO NOTHING;

-- Bill definitions
CREATE TABLE IF NOT EXISTS bills (
  id               SERIAL PRIMARY KEY,
  name             TEXT NOT NULL,
  amount           NUMERIC(10,2) NOT NULL,
  due_day          INTEGER NOT NULL CHECK (due_day BETWEEN 1 AND 31),
  assigned_paycheck INTEGER NOT NULL CHECK (assigned_paycheck IN (1, 2)),
  category         TEXT NOT NULL DEFAULT 'General',
  active           BOOLEAN NOT NULL DEFAULT TRUE,
  created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Paycheck instances per period
CREATE TABLE IF NOT EXISTS paychecks (
  id               SERIAL PRIMARY KEY,
  period_year      INTEGER NOT NULL,
  period_month     INTEGER NOT NULL CHECK (period_month BETWEEN 1 AND 12),
  paycheck_number  INTEGER NOT NULL CHECK (paycheck_number IN (1, 2)),
  pay_date         DATE NOT NULL,
  gross            NUMERIC(10,2) NOT NULL DEFAULT 0,
  net              NUMERIC(10,2) NOT NULL DEFAULT 0,
  UNIQUE (period_year, period_month, paycheck_number)
);

-- Bills assigned to a paycheck period
CREATE TABLE IF NOT EXISTS paycheck_bills (
  id              SERIAL PRIMARY KEY,
  paycheck_id     INTEGER NOT NULL REFERENCES paychecks(id) ON DELETE CASCADE,
  bill_id         INTEGER NOT NULL REFERENCES bills(id) ON DELETE CASCADE,
  amount_override NUMERIC(10,2),
  paid            BOOLEAN NOT NULL DEFAULT FALSE,
  paid_at         TIMESTAMPTZ,
  UNIQUE (paycheck_id, bill_id)
);

-- Savings goals
CREATE TABLE IF NOT EXISTS savings_goals (
  id                SERIAL PRIMARY KEY,
  name              TEXT NOT NULL,
  amount            NUMERIC(10,2) NOT NULL,
  assigned_paycheck INTEGER NOT NULL CHECK (assigned_paycheck IN (1, 2)),
  active            BOOLEAN NOT NULL DEFAULT TRUE
);

-- One-time expenses
CREATE TABLE IF NOT EXISTS one_time_expenses (
  id          SERIAL PRIMARY KEY,
  paycheck_id INTEGER NOT NULL REFERENCES paychecks(id) ON DELETE CASCADE,
  name        TEXT NOT NULL,
  amount      NUMERIC(10,2) NOT NULL,
  paid        BOOLEAN NOT NULL DEFAULT FALSE,
  paid_at     TIMESTAMPTZ
);

-- Variable expense categories
CREATE TABLE IF NOT EXISTS expense_categories (
  id   SERIAL PRIMARY KEY,
  name TEXT NOT NULL UNIQUE
);

-- Seed default categories
INSERT INTO expense_categories (name) VALUES
  ('Groceries'), ('Gas'), ('Dining'), ('Entertainment'), ('Medical'), ('Other')
ON CONFLICT (name) DO NOTHING;

-- Actual spending log
CREATE TABLE IF NOT EXISTS actuals (
  id          SERIAL PRIMARY KEY,
  paycheck_id INTEGER NOT NULL REFERENCES paychecks(id) ON DELETE CASCADE,
  category_id INTEGER REFERENCES expense_categories(id),
  bill_id     INTEGER REFERENCES bills(id),
  amount      NUMERIC(10,2) NOT NULL,
  note        TEXT,
  date        DATE NOT NULL DEFAULT CURRENT_DATE,
  created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
);