create type "delivery_type_enum"      as enum ('hand_shipped', 'easypost', 'hand_delivered');
create type "transaction_state_enum"  as enum ('started', 'completed', 'cancelled', 'expired');
create type "payment_state_enum"      as enum ('ks_reward', 'stripe', 'paypal', 'account_credit');

create table "user" (
  user_uuid uuid primary key default uuid_generate_v4(),
  user_email citext unique not null,
  user_email_confirmed boolean not null default false,
  user_password_hash varchar(60),
  user_time_registered timestamptz not null default now(),
  user_time_email_confirmed timestamptz
);

create table "login_link" (
  login_link_uuid uuid primary key default uuid_generate_v4(),
  login_link_user_uuid uuid not null references "user" (user_uuid),
  login_link_time_created timestamptz not null default now(),
  login_link_timeout_length interval not null,
  login_link_login_hash varchar(60) not null
);

create table "cart" (
  cart_uuid uuid primary key default uuid_generate_v4()
);

create table "session" (
  session_uuid uuid primary key default uuid_generate_v4(),
  session_time_created timestamptz not null default now(),
  session_time_last_active timestamptz not null default now(),
  session_timeout_length interval not null,
  session_ip_address varchar(50)  not null,
  session_user_agent varchar(500) not null,
  session_referer    varchar(500) not null,
  session_user_uuid uuid not null references "user" (user_uuid),
  session_originating_link uuid references "login_link" (login_link_uuid),
  session_cart uuid references "cart" (cart_uuid)
);

create table "item" (
  item_uuid uuid primary key default uuid_generate_v4(),
  item_name text not null,
  item_urlslug citext unique not null,
  item_price_cents integer not null
);

create table "cart_item" (
  cart_item_uuid uuid primary key default uuid_generate_v4(),
  cart_item_item_uuid uuid not null references "item" (item_uuid),
  cart_item_cart_uuid uuid not null references "cart" (cart_uuid),
  cart_item_count integer not null default 1,
  cart_item_time_added timestamptz not null default now()
);

create table "address" (
  address_uuid  uuid  primary key default uuid_generate_v4(),
  address_name  text  not null,
  address_company text,
  address_street1 text not null,
  address_street2 text,
  address_city  text not null,
  address_state text not null,
  address_zip   text not null,
  address_country text not null,
  address_phone text,
  address_easypost_id  text
);

create table "delivery" (
  delivery_uuid   uuid   primary key default uuid_generate_v4(),
  delivery_type   delivery_type_enum  not null,
  unique (delivery_uuid, delivery_type)
);

create table "delivery_hand_shipped" (
  delivery_uuid             uuid          not null,
  delivery_type             delivery_type_enum  not null,
  foreign key (delivery_uuid, delivery_type) references "delivery" (delivery_uuid, delivery_type),

  delivery_tracking_number  text          not null,
  delivery_date_shipped     timestamptz   not null
);

create table "delivery_easypost" (
  delivery_uuid             uuid          not null,
  delivery_type             delivery_type_enum  not null,
  foreign key (delivery_uuid, delivery_type) references "delivery" (delivery_uuid, delivery_type),

  delivery_tracking_number  text          not null,
  delivery_date_shipped     timestamptz   not null,
  delivery_easypost_id      text          not null
);

create table "delivery_hand_delivered" (
  delivery_uuid             uuid          not null,
  delivery_type             delivery_type_enum  not null,
  foreign key (delivery_uuid, delivery_type) references "delivery" (delivery_uuid, delivery_type),

  delivery_description      text          not null,
  delivery_date_delivered   timestamptz   not null
);

create table "order" (
  order_uuid            uuid            primary key default uuid_generate_v4(),
  order_number          int             not null,
  order_start_time      timestamptz     not null default now(),
  order_user_uuid       uuid            foreign key references "user" (user_uuid),
  order_address_uuid    uuid            foreign key references "address" (address_uuid),
  order_delivery_uuid   uuid            foreign key references "delivery" (delivery_uuid)
);

create table "coupon" (
  coupon_uuid                     uuid            primary key default uuid_generate_v4(),
  coupon_code                     varchar(50)     unique not null,
  coupon_valid_until              timestamptz     not null,
  coupon_free_shipping            boolean         not null default false,
  coupon_number_allowed_uses      integer         not null default 1 check (coupon_number_allowed_uses > 0),
  coupon_flat_discount_cents      integer         not null default 0 check (coupon_flat_discount_cents >= 0),
  coupon_percent_discount         integer         not null default 0 check (coupon_percent_discount >= 0 and coupon_percent_discount <= 100),
  coupon_per_sock_discount_cents  integer         not null default 0 check (coupon_per_sock_discount_cents >= 0),
  coupon_number_of_socks_free     integer         not null default 0 check (coupon_number_of_socks_free >= 0)
);

create table "transaction" (
  transaction_uuid                        uuid                      primary key default uuid_generate_v4(),
  transaction_order_uuid                  uuid                      foreign key references "order" (order_uuid),
  transaction_cart_uuid                   uuid                      foreign key references "cart" (cart_uuid),
  transaction_coupon_uuid                 uuid                      foreign key references "transaction" (transaction_uuid),
  transaction_start_time                  timestamptz               not null default now(),
  transaction_completion_time             timestamptz,
  transaction_payment_state               transaction_state_enum,   not null default 'started',
  transaction_item_total_price            integer                   not null,
  transaction_coupon_effective_discount   integer                   not null,
  transaction_shipping_price              integer                   not null
);

create table "payment" (
  payment_uuid                  uuid                  primary key default uuid_generate_v4(),
  payment_type                  payment_type_enum
)