-- Monaco USA Portal 2026 - Document Folders
-- Adds hierarchical folder support for document organization

-- ============================================
-- DOCUMENT FOLDERS TABLE
-- ============================================
CREATE TABLE public.document_folders (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  name TEXT NOT NULL,
  parent_id UUID REFERENCES public.document_folders(id) ON DELETE CASCADE,
  path TEXT, -- Full path for breadcrumb support
  visibility TEXT NOT NULL DEFAULT 'members'
    CHECK (visibility IN ('public', 'members', 'board', 'admin')),
  created_by UUID REFERENCES public.members(id),
  created_at TIMESTAMPTZ DEFAULT NOW(),
  updated_at TIMESTAMPTZ DEFAULT NOW(),

  -- Ensure unique folder names within same parent
  UNIQUE(name, parent_id)
);

-- Add updated_at trigger
CREATE TRIGGER document_folders_updated_at
  BEFORE UPDATE ON public.document_folders
  FOR EACH ROW
  EXECUTE FUNCTION update_updated_at();

-- ============================================
-- ADD FOLDER_ID TO DOCUMENTS TABLE
-- ============================================
ALTER TABLE public.documents
ADD COLUMN folder_id UUID REFERENCES public.document_folders(id) ON DELETE SET NULL;

-- ============================================
-- PATH UPDATE TRIGGER
-- ============================================
CREATE OR REPLACE FUNCTION update_folder_path()
RETURNS TRIGGER AS $$
DECLARE
  parent_path TEXT;
BEGIN
  IF NEW.parent_id IS NULL THEN
    NEW.path = NEW.name;
  ELSE
    SELECT path INTO parent_path
    FROM public.document_folders
    WHERE id = NEW.parent_id;

    NEW.path = parent_path || '/' || NEW.name;
  END IF;
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER folder_path_trigger
  BEFORE INSERT OR UPDATE ON public.document_folders
  FOR EACH ROW
  EXECUTE FUNCTION update_folder_path();

-- ============================================
-- RLS POLICIES FOR FOLDERS
-- ============================================
ALTER TABLE public.document_folders ENABLE ROW LEVEL SECURITY;

-- Everyone can view folders based on visibility
CREATE POLICY "Folders visible based on visibility" ON public.document_folders
  FOR SELECT USING (
    visibility = 'public' OR
    (visibility = 'members' AND auth.uid() IS NOT NULL) OR
    (visibility = 'board' AND EXISTS (
      SELECT 1 FROM public.members WHERE id = auth.uid() AND role IN ('board', 'admin')
    )) OR
    (visibility = 'admin' AND EXISTS (
      SELECT 1 FROM public.members WHERE id = auth.uid() AND role = 'admin'
    ))
  );

-- Board and admin can create folders
CREATE POLICY "Board/admin can create folders" ON public.document_folders
  FOR INSERT WITH CHECK (
    EXISTS (SELECT 1 FROM public.members WHERE id = auth.uid() AND role IN ('board', 'admin'))
  );

-- Board and admin can update folders
CREATE POLICY "Board/admin can update folders" ON public.document_folders
  FOR UPDATE USING (
    EXISTS (SELECT 1 FROM public.members WHERE id = auth.uid() AND role IN ('board', 'admin'))
  );

-- Only admin can delete folders
CREATE POLICY "Admin can delete folders" ON public.document_folders
  FOR DELETE USING (
    EXISTS (SELECT 1 FROM public.members WHERE id = auth.uid() AND role = 'admin')
  );

-- ============================================
-- INDEX FOR FOLDER QUERIES
-- ============================================
CREATE INDEX idx_document_folders_parent ON public.document_folders(parent_id);
CREATE INDEX idx_documents_folder ON public.documents(folder_id);