-- Ticket #205 — Renommer absences_garde → evenements_agenda
-- Migration base live. Idempotent autant que possible.

-- ---------------------------------------------------------------------------
-- 1. Table + enums
-- ---------------------------------------------------------------------------
DO $$
BEGIN
  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'absences_garde')
     AND NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'evenements_agenda') THEN
    ALTER TABLE absences_garde RENAME TO evenements_agenda;
  END IF;
END $$;

DO $$
BEGIN
  IF EXISTS (SELECT 1 FROM pg_type WHERE typname = 'type_absence_garde_type')
     AND NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'type_evenement_agenda_type') THEN
    ALTER TYPE type_absence_garde_type RENAME TO type_evenement_agenda_type;
  END IF;
  IF EXISTS (SELECT 1 FROM pg_type WHERE typname = 'statut_absence_garde_type')
     AND NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'statut_evenement_agenda_type') THEN
    ALTER TYPE statut_absence_garde_type RENAME TO statut_evenement_agenda_type;
  END IF;
END $$;

-- Contraintes / index (noms)
DO $$
BEGIN
  IF EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chk_absences_garde_dates') THEN
    ALTER TABLE evenements_agenda RENAME CONSTRAINT chk_absences_garde_dates TO chk_evenements_agenda_dates;
  END IF;
END $$;

ALTER INDEX IF EXISTS idx_absences_garde_placement_dates
  RENAME TO idx_evenements_agenda_placement_dates;
ALTER INDEX IF EXISTS idx_absences_garde_placement_type_statut
  RENAME TO idx_evenements_agenda_placement_type_statut;
ALTER INDEX IF EXISTS idx_absences_garde_expire_at
  RENAME TO idx_evenements_agenda_expire_at;
ALTER INDEX IF EXISTS absences_garde_pkey
  RENAME TO evenements_agenda_pkey;

COMMENT ON TABLE evenements_agenda IS
  'Vérité métier agenda (absences, congés, arrêts, futurs soins/école/mairie/sorties…) par placement. Les cartes collectent ; cette table historise.';
COMMENT ON COLUMN evenements_agenda.expire_at IS
  'Purge auto (job) pour en_attente/refuse. accepte → infinity.';
COMMENT ON COLUMN evenements_agenda.id_card_instance IS
  'Réf. carte de collecte (module Cartes).';

-- ---------------------------------------------------------------------------
-- 2. card_instances.id_absence → id_evenement
-- ---------------------------------------------------------------------------
DO $$
BEGIN
  IF EXISTS (
    SELECT 1 FROM information_schema.columns
    WHERE table_name = 'card_instances' AND column_name = 'id_absence'
  ) AND NOT EXISTS (
    SELECT 1 FROM information_schema.columns
    WHERE table_name = 'card_instances' AND column_name = 'id_evenement'
  ) THEN
    ALTER TABLE card_instances RENAME COLUMN id_absence TO id_evenement;
  END IF;
END $$;

-- Recréer index si ancien nom
ALTER INDEX IF EXISTS idx_card_instances_absence
  RENAME TO idx_card_instances_evenement;

-- FK : drop ancienne (nom variable) puis recreate
DO $$
DECLARE
  fk_name text;
BEGIN
  SELECT conname INTO fk_name
  FROM pg_constraint
  WHERE conrelid = 'card_instances'::regclass
    AND contype = 'f'
    AND pg_get_constraintdef(oid) ILIKE '%id_evenement%'
  LIMIT 1;

  IF fk_name IS NULL THEN
    SELECT conname INTO fk_name
    FROM pg_constraint
    WHERE conrelid = 'card_instances'::regclass
      AND contype = 'f'
      AND pg_get_constraintdef(oid) ILIKE '%id_absence%'
    LIMIT 1;
  END IF;

  IF fk_name IS NOT NULL THEN
    EXECUTE format('ALTER TABLE card_instances DROP CONSTRAINT %I', fk_name);
  END IF;

  IF NOT EXISTS (
    SELECT 1 FROM pg_constraint
    WHERE conname = 'card_instances_id_evenement_fkey'
  ) THEN
    ALTER TABLE card_instances
      ADD CONSTRAINT card_instances_id_evenement_fkey
      FOREIGN KEY (id_evenement)
      REFERENCES evenements_agenda(id)
      ON DELETE SET NULL;
  END IF;
END $$;