-- ============================================================================
-- Custom Fields — Adaptable fields per entity type (leads, customers, etc.)
-- ============================================================================

CREATE TABLE IF NOT EXISTS custom_field_definitions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    entity_type VARCHAR(50) NOT NULL,
    field_key VARCHAR(100) NOT NULL,
    field_label VARCHAR(255) NOT NULL,
    field_type VARCHAR(50) NOT NULL DEFAULT 'text',
    options JSONB,
    placeholder TEXT,
    default_value TEXT,
    section VARCHAR(100),
    is_required BOOLEAN NOT NULL DEFAULT FALSE,
    sort_order INT NOT NULL DEFAULT 0,
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT uq_custom_field_entity_key UNIQUE (entity_type, field_key),
    CONSTRAINT chk_custom_field_type CHECK (field_type IN ('text','number','date','select','multi_select','boolean','url','email','phone'))
);

CREATE INDEX idx_custom_fields_entity ON custom_field_definitions(entity_type, is_active, sort_order);

ALTER TABLE leads ADD COLUMN IF NOT EXISTS custom_fields JSONB DEFAULT '{}';
ALTER TABLE customers ADD COLUMN IF NOT EXISTS custom_fields JSONB DEFAULT '{}';
ALTER TABLE opportunities ADD COLUMN IF NOT EXISTS custom_fields JSONB DEFAULT '{}';
ALTER TABLE projects ADD COLUMN IF NOT EXISTS custom_fields JSONB DEFAULT '{}';

-- Seed sample fields
INSERT INTO custom_field_definitions (entity_type, field_key, field_label, field_type, options, section, sort_order) VALUES
  ('lead', 'service_type', 'Service Type', 'select', '["Web Development","Mobile App","SEO","Consulting","Retainer","Maintenance"]', 'Details', 1),
  ('lead', 'budget_confirmed', 'Budget Confirmed', 'boolean', NULL, 'Details', 2),
  ('lead', 'referral_source', 'Referral Source', 'text', NULL, 'Details', 3),
  ('customer', 'industry_vertical', 'Industry Vertical', 'select', '["Fintech","Healthcare","E-commerce","Education","Real Estate","Hospitality","Other"]', 'Business', 1),
  ('customer', 'vat_number', 'VAT Number', 'text', NULL, 'Business', 2),
  ('project', 'project_type', 'Project Type', 'select', '["New Build","Redesign","Maintenance","Consulting","Retainer"]', 'Details', 1),
  ('project', 'hosting_provider', 'Hosting Provider', 'text', NULL, 'Technical', 2),
  ('project', 'tech_stack', 'Tech Stack', 'multi_select', '["React","Next.js","Node.js","Python","PHP","WordPress","Shopify","Laravel","Vue","Angular"]', 'Technical', 3),
  ('opportunity', 'competitor', 'Competitor', 'text', NULL, 'Details', 1),
  ('opportunity', 'decision_timeline', 'Decision Timeline', 'select', '["This Week","This Month","This Quarter","Next Quarter","Not Sure"]', 'Details', 2)
ON CONFLICT (entity_type, field_key) DO NOTHING;