-- 1) Link budgets to chart of accounts (optional)
ALTER TABLE public.budgets
  ADD COLUMN IF NOT EXISTS gl_account_id UUID REFERENCES public.chart_of_accounts(id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_budgets_gl_account ON public.budgets(gl_account_id);

-- 2) Monthly actuals view: union of expense + income transactions
DROP VIEW IF EXISTS public.budget_actuals_monthly CASCADE;

CREATE VIEW public.budget_actuals_monthly
WITH (security_invoker = true)
AS
-- Expenses from bills (use expense_account_id when present)
SELECT
  b.association_id,
  date_trunc('month', b.bill_date)::date AS period_month,
  'expense'::text AS account_type,
  b.expense_account_id AS gl_account_id,
  coa.account_name AS category_name,
  SUM(COALESCE(b.amount, 0))::numeric AS amount
FROM public.bills b
LEFT JOIN public.chart_of_accounts coa ON coa.id = b.expense_account_id
WHERE b.status IN ('paid', 'approved', 'partially_paid')
  AND b.bill_date IS NOT NULL
GROUP BY b.association_id, date_trunc('month', b.bill_date), b.expense_account_id, coa.account_name

UNION ALL

-- Expenses from billable_expenses (categorised line items)
SELECT
  be.association_id,
  date_trunc('month', be.date)::date AS period_month,
  'expense'::text AS account_type,
  NULL::uuid AS gl_account_id,
  COALESCE(be.category, 'Uncategorized') AS category_name,
  SUM(COALESCE(be.amount, 0))::numeric AS amount
FROM public.billable_expenses be
WHERE be.date IS NOT NULL
  AND COALESCE(be.is_credit, false) = false
GROUP BY be.association_id, date_trunc('month', be.date), be.category

UNION ALL

-- Income from admin payments (owner payments recorded directly)
SELECT
  ap.association_id,
  date_trunc('month', COALESCE(ap.payment_date, ap.created_at::date))::date AS period_month,
  'income'::text AS account_type,
  NULL::uuid AS gl_account_id,
  'Owner Payments'::text AS category_name,
  SUM(COALESCE(ap.amount, 0))::numeric AS amount
FROM public.admin_payments ap
WHERE ap.status IN ('completed', 'paid', 'success')
GROUP BY ap.association_id, date_trunc('month', COALESCE(ap.payment_date, ap.created_at::date))

UNION ALL

-- Income from client invoices (paid)
SELECT
  ci.association_id,
  date_trunc('month', COALESCE(ci.paid_date, ci.issue_date))::date AS period_month,
  'income'::text AS account_type,
  NULL::uuid AS gl_account_id,
  'Invoiced Income'::text AS category_name,
  SUM(COALESCE(ci.total, ci.amount, 0))::numeric AS amount
FROM public.client_invoices ci
WHERE ci.status IN ('paid', 'partially_paid')
  AND COALESCE(ci.paid_date, ci.issue_date) IS NOT NULL
GROUP BY ci.association_id, date_trunc('month', COALESCE(ci.paid_date, ci.issue_date));

GRANT SELECT ON public.budget_actuals_monthly TO authenticated, anon, service_role;