create table if not exists public.tenant_theme_templates (
  id uuid primary key default gen_random_uuid(),
  code text not null unique,
  name text not null,
  description text,
  preview_image_url text,
  theme jsonb not null default '{}'::jsonb,
  public_assets jsonb not null default '{}'::jsonb,
  status text not null default 'active' check (status in ('active', 'disabled')),
  sort_order integer not null default 100,
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now()
);

create table if not exists public.tenant_theme_configs (
  tenant_id uuid primary key references public.tenants(id) on delete cascade,
  active_template_code text references public.tenant_theme_templates(code) on delete set null,
  active_theme jsonb not null default '{}'::jsonb,
  active_public_assets jsonb not null default '{}'::jsonb,
  draft_template_code text references public.tenant_theme_templates(code) on delete set null,
  draft_theme jsonb not null default '{}'::jsonb,
  draft_public_assets jsonb not null default '{}'::jsonb,
  status text not null default 'published' check (status in ('draft', 'published')),
  published_at timestamptz,
  published_by uuid references public.platform_users(id) on delete set null,
  draft_updated_by uuid references public.platform_users(id) on delete set null,
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now()
);

create index if not exists idx_theme_templates_status_sort
  on public.tenant_theme_templates(status, sort_order, code);

alter table public.tenant_theme_templates enable row level security;
alter table public.tenant_theme_configs enable row level security;

drop policy if exists theme_templates_public_read on public.tenant_theme_templates;
create policy theme_templates_public_read on public.tenant_theme_templates
  for select
  using (status = 'active' or app.is_platform_admin());

drop policy if exists tenant_isolation on public.tenant_theme_configs;
create policy tenant_isolation on public.tenant_theme_configs
  for all
  using (tenant_id = app.current_tenant_id() or app.is_platform_admin())
  with check (tenant_id = app.current_tenant_id() or app.is_platform_admin());

drop trigger if exists set_updated_at on public.tenant_theme_templates;
create trigger set_updated_at
  before update on public.tenant_theme_templates
  for each row
  execute function app.touch_updated_at();

drop trigger if exists set_updated_at on public.tenant_theme_configs;
create trigger set_updated_at
  before update on public.tenant_theme_configs
  for each row
  execute function app.touch_updated_at();

insert into public.tenant_theme_templates (code, name, description, theme, public_assets, sort_order)
values
  (
    'classic',
    '经典蓝',
    '稳重、清晰、适合默认题库和机构后台。',
    '{
      "mode":"light",
      "primaryColor":"#2563eb",
      "accentColor":"#0f766e",
      "backgroundColor":"#f8fafc",
      "surfaceColor":"#ffffff",
      "textColor":"#0f172a",
      "mutedColor":"#64748b",
      "borderRadius":8,
      "buttonRadius":8,
      "fontFamily":"system",
      "layoutDensity":"comfortable"
    }'::jsonb,
    '{"iconSet":"classic","shareCardStyle":"clean"}'::jsonb,
    10
  ),
  (
    'focus',
    '专注绿',
    '低干扰学习主题，适合学生端刷题和背单词场景。',
    '{
      "mode":"light",
      "primaryColor":"#0f766e",
      "accentColor":"#7c3aed",
      "backgroundColor":"#f5fbf8",
      "surfaceColor":"#ffffff",
      "textColor":"#10201b",
      "mutedColor":"#55706a",
      "borderRadius":8,
      "buttonRadius":8,
      "fontFamily":"system",
      "layoutDensity":"compact"
    }'::jsonb,
    '{"iconSet":"focus","shareCardStyle":"study"}'::jsonb,
    20
  ),
  (
    'high-contrast',
    '高对比',
    '强化标题、按钮和导航对比度，适合强运营入口和大屏后台。',
    '{
      "mode":"light",
      "primaryColor":"#111827",
      "accentColor":"#f59e0b",
      "backgroundColor":"#f3f4f6",
      "surfaceColor":"#ffffff",
      "textColor":"#030712",
      "mutedColor":"#4b5563",
      "borderRadius":6,
      "buttonRadius":6,
      "fontFamily":"system",
      "layoutDensity":"dense"
    }'::jsonb,
    '{"iconSet":"contrast","shareCardStyle":"bold"}'::jsonb,
    30
  )
on conflict (code)
do update set name = excluded.name,
              description = excluded.description,
              theme = excluded.theme,
              public_assets = excluded.public_assets,
              sort_order = excluded.sort_order,
              status = 'active',
              updated_at = now();