import { sql } from 'drizzle-orm';
import { index, integer, sqliteTable, text } from 'drizzle-orm/sqlite-core';

export const pots = sqliteTable('pots', {
  slug: text('slug').primaryKey(),
  name: text('name').notNull(),
  currency: text('currency').notNull(),
  createdAt: integer('created_at')
    .notNull()
    .default(sql`(unixepoch())`),
});

export const participants = sqliteTable(
  'participants',
  {
    id: integer('id').primaryKey({ autoIncrement: true }),
    potSlug: text('pot_slug')
      .notNull()
      .references(() => pots.slug),
    name: text('name').notNull(),
    paymentLink: text('payment_link'),
    createdAt: integer('created_at')
      .notNull()
      .default(sql`(unixepoch())`),
  },
  (table) => [index('participants_pot_slug_idx').on(table.potSlug)],
);

export const expenses = sqliteTable(
  'expenses',
  {
    id: integer('id').primaryKey({ autoIncrement: true }),
    potSlug: text('pot_slug')
      .notNull()
      .references(() => pots.slug),
    // 'payment' rows are settlements: payerId is who paid, and the single row
    // in expenseParticipants is who received it — same shape as a one-person
    // split expense, which is mathematically what a settlement is.
    type: text('type').notNull().default('expense'),
    description: text('description').notNull(),
    amountCents: integer('amount_cents').notNull(),
    payerId: integer('payer_id')
      .notNull()
      .references(() => participants.id),
    createdAt: integer('created_at')
      .notNull()
      .default(sql`(unixepoch())`),
  },
  (table) => [index('expenses_pot_slug_idx').on(table.potSlug)],
);

export const expenseParticipants = sqliteTable(
  'expense_participants',
  {
    expenseId: integer('expense_id')
      .notNull()
      .references(() => expenses.id),
    participantId: integer('participant_id')
      .notNull()
      .references(() => participants.id),
  },
  (table) => [index('expense_participants_expense_id_idx').on(table.expenseId)],
);