-- Create dispensary_changes table for change approval workflow
-- This protects against accidental data destruction by requiring manual review
CREATE TABLE IF NOT EXISTS dispensary_changes (
  id SERIAL PRIMARY KEY,
  dispensary_id INTEGER NOT NULL REFERENCES dispensaries(id) ON DELETE CASCADE,

  -- What changed
  field_name VARCHAR(100) NOT NULL,         -- 'dba_name', 'website', 'phone', 'menu_url', etc.
  old_value TEXT,                           -- Previous value (null if new field)
  new_value TEXT,                           -- Proposed new value

  -- Where it came from
  source VARCHAR(50) NOT NULL,              -- 'google_maps', 'manual_edit', 'azdhs_update', 'dutchie_scraper'
  confidence_score VARCHAR(20),             -- 'high', 'medium', 'low' (for automated changes)
  change_notes TEXT,                        -- Optional explanation

  -- Approval workflow
  status VARCHAR(20) DEFAULT 'pending' NOT NULL CHECK (status IN ('pending', 'approved', 'rejected')),
  requires_recrawl BOOLEAN DEFAULT FALSE,   -- TRUE for website/menu_url changes

  -- Audit trail
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  reviewed_at TIMESTAMP,
  reviewed_by INTEGER REFERENCES users(id),
  rejection_reason TEXT
);

-- Create indexes for common queries
CREATE INDEX IF NOT EXISTS idx_dispensary_changes_status ON dispensary_changes(status);
CREATE INDEX IF NOT EXISTS idx_dispensary_changes_dispensary_status ON dispensary_changes(dispensary_id, status);
CREATE INDEX IF NOT EXISTS idx_dispensary_changes_created_at ON dispensary_changes(created_at DESC);
CREATE INDEX IF NOT EXISTS idx_dispensary_changes_requires_recrawl ON dispensary_changes(requires_recrawl) WHERE requires_recrawl = TRUE;

-- Create function to automatically set requires_recrawl for website/menu_url changes
CREATE OR REPLACE FUNCTION set_requires_recrawl()
RETURNS TRIGGER AS $$
BEGIN
  IF NEW.field_name IN ('website', 'menu_url') THEN
    NEW.requires_recrawl := TRUE;
  END IF;
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- Create trigger to call the function (drop first to make idempotent)
DROP TRIGGER IF EXISTS trigger_set_requires_recrawl ON dispensary_changes;
CREATE TRIGGER trigger_set_requires_recrawl
  BEFORE INSERT ON dispensary_changes
  FOR EACH ROW
  EXECUTE FUNCTION set_requires_recrawl();