BEGIN;

CREATE EXTENSION IF NOT EXISTS pgcrypto;

DO $$
BEGIN
  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'record_status') THEN
    CREATE TYPE record_status AS ENUM ('active','inactive');
  END IF;
END
$$;

CREATE TABLE IF NOT EXISTS users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  authentik_sub TEXT NOT NULL UNIQUE,
  authentik_user_id INTEGER,
  email TEXT UNIQUE,
  display_name TEXT,
  status record_status NOT NULL DEFAULT 'active',
  is_active BOOLEAN NOT NULL DEFAULT TRUE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS companies (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  company_key TEXT NOT NULL UNIQUE,
  name TEXT NOT NULL,
  status record_status NOT NULL DEFAULT 'active',
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS systems (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  system_key TEXT NOT NULL UNIQUE,
  name TEXT NOT NULL,
  status record_status NOT NULL DEFAULT 'active',
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS modules (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  module_key TEXT NOT NULL UNIQUE,
  name TEXT NOT NULL,
  status record_status NOT NULL DEFAULT 'active',
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS sites (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  site_key TEXT NOT NULL UNIQUE,
  company_id UUID NOT NULL REFERENCES companies(id) ON DELETE CASCADE,
  name TEXT NOT NULL,
  status record_status NOT NULL DEFAULT 'active',
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

DO $$
BEGIN
  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'scope_type') THEN
    CREATE TYPE scope_type AS ENUM ('company','site');
  END IF;
  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'permission_action') THEN
    CREATE TYPE permission_action AS ENUM ('view','create','update','delete','manage');
  END IF;
END
$$;

CREATE TABLE IF NOT EXISTS user_scope_permissions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  module_id UUID NOT NULL REFERENCES modules(id) ON DELETE CASCADE,
  action permission_action NOT NULL,
  scope_type scope_type NOT NULL,
  company_id UUID REFERENCES companies(id) ON DELETE CASCADE,
  site_id UUID REFERENCES sites(id) ON DELETE CASCADE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

ALTER TABLE user_scope_permissions DROP CONSTRAINT IF EXISTS user_scope_permissions_check;
ALTER TABLE user_scope_permissions
  ADD CONSTRAINT user_scope_permissions_check
  CHECK (
    ((scope_type = 'company' AND company_id IS NOT NULL AND site_id IS NULL)
     OR (scope_type = 'site' AND site_id IS NOT NULL AND company_id IS NULL))
  );

CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_company
ON user_scope_permissions(user_id, module_id, action, scope_type, company_id)
WHERE scope_type = 'company';

CREATE UNIQUE INDEX IF NOT EXISTS uq_usp_site
ON user_scope_permissions(user_id, module_id, action, scope_type, site_id)
WHERE scope_type = 'site';

CREATE TABLE IF NOT EXISTS permission_groups (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  group_key TEXT NOT NULL UNIQUE,
  name TEXT NOT NULL,
  status record_status NOT NULL DEFAULT 'active',
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS permission_group_members (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  group_id UUID NOT NULL REFERENCES permission_groups(id) ON DELETE CASCADE,
  authentik_sub TEXT NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  CONSTRAINT uq_permission_group_members_group_sub UNIQUE (group_id, authentik_sub)
);

CREATE TABLE IF NOT EXISTS permission_group_permissions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  group_id UUID NOT NULL REFERENCES permission_groups(id) ON DELETE CASCADE,
  system TEXT NOT NULL,
  module TEXT NOT NULL,
  action TEXT NOT NULL,
  scope_type TEXT NOT NULL,
  scope_id TEXT NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS uq_pgp_group_rule
ON permission_group_permissions(group_id, system, module, action, scope_type, scope_id);

CREATE INDEX IF NOT EXISTS idx_users_authentik_sub ON users(authentik_sub);
CREATE INDEX IF NOT EXISTS idx_sites_company_id ON sites(company_id);
CREATE INDEX IF NOT EXISTS idx_usp_user_id ON user_scope_permissions(user_id);
CREATE INDEX IF NOT EXISTS idx_usp_module_id ON user_scope_permissions(module_id);
CREATE INDEX IF NOT EXISTS idx_usp_company_id ON user_scope_permissions(company_id);
CREATE INDEX IF NOT EXISTS idx_usp_site_id ON user_scope_permissions(site_id);

COMMIT;