-- Mall Software Subscription Tables
-- PostgreSQL DDL; adjust schema name as needed (default public)

-- Plans
create table if not exists ml_subscription_plans (
    id uuid primary key default gen_random_uuid(),
    plan_code text not null unique,
    name text not null,
    description text,
    features jsonb,
    price numeric(12,2) not null,
    currency text default 'CNY',
    billing_period text not null check (billing_period in ('monthly','yearly')),
    trial_days int default 0,
    is_active boolean default true,
    sort_order int default 0,
    created_at timestamptz not null default now(),
    updated_at timestamptz not null default now()
);

create index if not exists idx_ml_subscription_plans_active on ml_subscription_plans(is_active) where is_active = true;
create index if not exists idx_ml_subscription_plans_sort on ml_subscription_plans(sort_order);

-- User Subscriptions
create table if not exists ml_user_subscriptions (
    id uuid primary key default gen_random_uuid(),
    user_id uuid not null,
    plan_id uuid not null references ml_subscription_plans(id) on delete restrict,
    status text not null default 'active' check (status in ('trial','active','past_due','canceled','expired')),
    start_date timestamptz not null default now(),
    end_date timestamptz,
    next_billing_date timestamptz,
    auto_renew boolean not null default true,
    cancel_at_period_end boolean not null default false,
    metadata jsonb,
    created_at timestamptz not null default now(),
    updated_at timestamptz not null default now()
);

create index if not exists idx_ml_user_subscriptions_user on ml_user_subscriptions(user_id);
create index if not exists idx_ml_user_subscriptions_plan on ml_user_subscriptions(plan_id);
create index if not exists idx_ml_user_subscriptions_status on ml_user_subscriptions(status);

-- updated_at trigger helper (idempotent)
create or replace function public.set_updated_at()
returns trigger
language plpgsql
as $fn$
begin
  new.updated_at = now();
  return new;
end;
$fn$;

-- Recreate triggers safely
drop trigger if exists trg_ml_subscription_plans_updated on ml_subscription_plans;
create trigger trg_ml_subscription_plans_updated
  before update on ml_subscription_plans
  for each row execute function public.set_updated_at();

drop trigger if exists trg_ml_user_subscriptions_updated on ml_user_subscriptions;
create trigger trg_ml_user_subscriptions_updated
  before update on ml_user_subscriptions
  for each row execute function public.set_updated_at();

-- Optional: basic RLS scaffolding (customize policies per project standards)
-- alter table ml_user_subscriptions enable row level security;
-- create policy rls_ml_user_subscriptions_owner on ml_user_subscriptions
--   using (user_id::text = current_setting('app.user_id', true));

-- Done