-- 001_initial.sql
-- Basis-Schema: Tenants, Screens, Medien, Playlists

create extension if not exists pgcrypto;

create table if not exists tenants (
    id         text primary key default gen_random_uuid()::text,
    slug       text not null unique,
    name       text not null,
    created_at timestamptz not null default now()
);

create table if not exists screens (
    id          text primary key default gen_random_uuid()::text,
    tenant_id   text not null references tenants(id) on delete cascade,
    slug        text not null unique,
    name        text not null,
    orientation text not null default 'landscape',
    created_at  timestamptz not null default now()
);

create table if not exists media_assets (
    id           text primary key default gen_random_uuid()::text,
    tenant_id    text not null references tenants(id) on delete cascade,
    title        text not null,
    type         text not null,        -- image | video | pdf | web
    storage_path text null,            -- set for uploads
    original_url text null,            -- set for web/remote
    mime_type    text null,
    size_bytes   bigint null,
    enabled      boolean not null default true,
    created_at   timestamptz not null default now()
);

create table if not exists playlists (
    id                       text primary key default gen_random_uuid()::text,
    tenant_id                text not null references tenants(id) on delete cascade,
    screen_id                text not null references screens(id) on delete cascade,
    name                     text not null,
    is_active                boolean not null default true,
    default_duration_seconds integer not null default 20,
    created_at               timestamptz not null default now(),
    updated_at               timestamptz not null default now(),
    unique (screen_id) -- one active playlist per screen (simplified)
);

create table if not exists playlist_items (
    id               text primary key default gen_random_uuid()::text,
    playlist_id      text not null references playlists(id) on delete cascade,
    media_asset_id   text null references media_assets(id) on delete set null,
    order_index      integer not null default 0,
    type             text not null,    -- image | video | pdf | web
    src              text not null,    -- URL or served path
    title            text null,
    duration_seconds integer not null default 20,
    valid_from       timestamptz null,
    valid_until      timestamptz null,
    enabled          boolean not null default true,
    created_at       timestamptz not null default now()
);

create index if not exists idx_screens_tenant_id        on screens(tenant_id);
create index if not exists idx_media_assets_tenant_id   on media_assets(tenant_id);
create index if not exists idx_playlists_screen_id      on playlists(screen_id);
create index if not exists idx_playlist_items_order     on playlist_items(playlist_id, order_index);

-- Schema-Versions-Tabelle
create table if not exists schema_migrations (
    version    integer primary key,
    applied_at timestamptz not null default now()
);

-- Seed: Standard-Tenant und erster Screen (idempotent)
insert into tenants (id, slug, name)
    values ('tenant-morz', 'morz', 'MORZ Schule')
    on conflict (slug) do nothing;