-- migrate:up

create table "emails" (
    "id" serial primary key,
    "uid" integer not null references "users" on delete cascade,
    "email" varchar(320) unique not null, -- local 64 + domain 255 + '@' 1 per RFC5321
    "verificationSecret" varchar(255) unique
);

create unique index "emails_uid_verified" on "emails" ("uid", ("verificationSecret" is not null));
-- at most one verified and one pending email per user

insert into "emails" ("uid", "email", "verificationSecret")
    select "id", "email", null as "verificationSecret" from "users" where "email" is not null;

insert into "emails" ("uid", "email", "verificationSecret")
    select "id", "pendingEmail", "emailVerificationSecret" from "users" where "pendingEmail" is not null;

alter table "users"
    drop "email" cascade,
    drop "pendingEmail" cascade,
    drop "emailVerificationSecret" cascade;

-- migrate:down

alter table "users"
    add "email" varchar(320) unique,
    add "pendingEmail" varchar(320) unique,
    add "emailVerificationSecret" varchar(255) unique;

update "users" set "email" = "emails"."email"
    from "emails"
    where "users"."id" = "emails"."uid" and "emails"."verificationSecret" is null;

update "users" set "pendingEmail" = "emails"."email",
    "emailVerificationSecret" = "emails"."verificationSecret"
    from "emails"
    where "users"."id" = "emails"."uid" and "emails"."verificationSecret" is not null;

drop table "emails";