-- Ticket #193 — Back métier absences / congés / arrêt (périodes par placement)
-- Idempotent : safe à rejouer.
-- Remplace la table legacy `evenements` (mal conçue, non utilisée en API).

-- ---------------------------------------------------------------------------
-- Enums
-- ---------------------------------------------------------------------------
DO $$
BEGIN
  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'type_absence_garde_type') THEN
    CREATE TYPE type_absence_garde_type AS ENUM (
      'absence_enfant',
      'conge_am',
      'arret_maladie_am'
    );
  END IF;
  IF NOT EXISTS (SELECT 1 FROM pg_type WHERE typname = 'statut_absence_garde_type') THEN
    CREATE TYPE statut_absence_garde_type AS ENUM (
      'en_attente',
      'accepte',
      'refuse'
    );
  END IF;
END $$;

-- ---------------------------------------------------------------------------
-- Table absences_garde (1 ligne = 1 période)
-- ---------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS absences_garde (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  id_placement UUID NOT NULL
    REFERENCES enfants_assistantes_maternelles(id) ON DELETE CASCADE,
  type type_absence_garde_type NOT NULL,
  date_debut DATE NOT NULL,
  date_fin DATE NOT NULL,
  statut statut_absence_garde_type NOT NULL DEFAULT 'en_attente',
  -- TTL purge : obligatoire ; pour statut=accepte utiliser 'infinity' (pas de purge métier)
  expire_at TIMESTAMPTZ NOT NULL,
  cree_par UUID REFERENCES utilisateurs(id) ON DELETE SET NULL,
  id_card_instance UUID NULL,
  motif TEXT,
  cree_le TIMESTAMPTZ NOT NULL DEFAULT now(),
  modifie_le TIMESTAMPTZ NOT NULL DEFAULT now(),
  CONSTRAINT chk_absences_garde_dates CHECK (date_fin >= date_debut)
);

CREATE INDEX IF NOT EXISTS idx_absences_garde_placement_dates
  ON absences_garde (id_placement, date_debut, date_fin);

CREATE INDEX IF NOT EXISTS idx_absences_garde_placement_type_statut
  ON absences_garde (id_placement, type, statut);

CREATE INDEX IF NOT EXISTS idx_absences_garde_expire_at
  ON absences_garde (expire_at)
  WHERE statut IN ('en_attente', 'refuse');

COMMENT ON TABLE absences_garde IS
  'Vérité métier des absences/congés/arrêts par couple AM↔enfant (placement). Les cartes collectent ; cette table stocke.';
COMMENT ON COLUMN absences_garde.expire_at IS
  'Purge auto (job ultérieur) pour en_attente/refuse. accepte → infinity.';
COMMENT ON COLUMN absences_garde.id_card_instance IS
  'Réf. carte de collecte (FK cards quand le module Cartes existera).';

-- ---------------------------------------------------------------------------
-- Drop legacy evenements (+ enums si plus référencés)
-- ---------------------------------------------------------------------------
DROP TABLE IF EXISTS evenements CASCADE;

DO $$
BEGIN
  IF EXISTS (SELECT 1 FROM pg_type WHERE typname = 'type_evenement_type')
     AND NOT EXISTS (
       SELECT 1 FROM information_schema.columns
       WHERE udt_name = 'type_evenement_type'
     ) THEN
    DROP TYPE type_evenement_type;
  END IF;
  IF EXISTS (SELECT 1 FROM pg_type WHERE typname = 'statut_evenement_type')
     AND NOT EXISTS (
       SELECT 1 FROM information_schema.columns
       WHERE udt_name = 'statut_evenement_type'
     ) THEN
    DROP TYPE statut_evenement_type;
  END IF;
END $$;