-- Create items table
CREATE TABLE items (
  id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
  name TEXT NOT NULL,
  description TEXT,
  category_id TEXT NOT NULL,
  subcategory_id TEXT,
  context_tags TEXT[] DEFAULT '{}',
  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Create index on user_id for faster queries
CREATE INDEX idx_items_user_id ON items(user_id);

-- Create index on category_id for filtering
CREATE INDEX idx_items_category_id ON items(category_id);

-- Create index on context_tags for tag-based searches
CREATE INDEX idx_items_context_tags ON items USING GIN(context_tags);

-- Enable Row Level Security
ALTER TABLE items ENABLE ROW LEVEL SECURITY;

-- Create policy to allow users to see their own items
CREATE POLICY "Users can view own items"
  ON items FOR SELECT
  USING (auth.uid() = user_id);

-- Create policy to allow users to insert their own items
CREATE POLICY "Users can insert own items"
  ON items FOR INSERT
  WITH CHECK (auth.uid() = user_id);

-- Create policy to allow users to update their own items
CREATE POLICY "Users can update own items"
  ON items FOR UPDATE
  USING (auth.uid() = user_id);

-- Create policy to allow users to delete their own items
CREATE POLICY "Users can delete own items"
  ON items FOR DELETE
  USING (auth.uid() = user_id);

-- Create trigger to update updated_at timestamp
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
  NEW.updated_at = NOW();
  RETURN NEW;
END;
$$ language 'plpgsql';

CREATE TRIGGER update_items_updated_at
  BEFORE UPDATE ON items
  FOR EACH ROW
  EXECUTE FUNCTION update_updated_at_column();