-- MijnBesluit - foto's bij personen en berichten
--
-- Tot nu toe kon een bestand alleen bij een kluisitem horen. Er komen twee koppelingen bij,
-- plus een vinkje voor de profielfoto:
--
--   subject_person_id : bij welke persoon deze foto hoort. Let op het verschil met
--                       owner_person_id: dat is wie de foto bewaart, dit is wie erop staat.
--   message_id        : bij welk bericht deze foto hoort.
--   is_profile_photo  : dit is de foto die bij de persoon op de kaart komt te staan.
--                       Er is er hoogstens een per persoon; de applicatie bewaakt dat.
--
-- Draaien met:
--   mysql -u root -p mijnbesluit < db\07_fotos.sql
--
-- Opnieuw draaien mag: er gebeurt dan niets.

USE `mijnbesluit`;

-- ---------------------------------------------------------------- subject_person_id
SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND COLUMN_NAME = 'subject_person_id');

SET @sql := IF(@bestaat = 0,
  'ALTER TABLE `vault_files` ADD COLUMN `subject_person_id` BIGINT NULL AFTER `vault_item_id`',
  'SELECT "subject_person_id bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- ---------------------------------------------------------------- message_id
SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND COLUMN_NAME = 'message_id');

SET @sql := IF(@bestaat = 0,
  'ALTER TABLE `vault_files` ADD COLUMN `message_id` BIGINT NULL AFTER `subject_person_id`',
  'SELECT "message_id bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- ---------------------------------------------------------------- is_profile_photo
SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND COLUMN_NAME = 'is_profile_photo');

SET @sql := IF(@bestaat = 0,
  'ALTER TABLE `vault_files` ADD COLUMN `is_profile_photo` TINYINT(1) NOT NULL DEFAULT 0',
  'SELECT "is_profile_photo bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- ---------------------------------------------------------------- indexen
SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND INDEX_NAME = 'ix_vault_files_subject');

SET @sql := IF(@bestaat = 0,
  'CREATE INDEX `ix_vault_files_subject` ON `vault_files` (`subject_person_id`)',
  'SELECT "ix_vault_files_subject bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND INDEX_NAME = 'ix_vault_files_message');

SET @sql := IF(@bestaat = 0,
  'CREATE INDEX `ix_vault_files_message` ON `vault_files` (`message_id`)',
  'SELECT "ix_vault_files_message bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- ---------------------------------------------------------------- relaties
-- Verdwijnt de persoon of het bericht, dan verdwijnt de koppeling; het bestand zelf ruimt de
-- applicatie op, want de versleutelde inhoud staat buiten de database.
SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.TABLE_CONSTRAINTS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND CONSTRAINT_NAME = 'fk_vf_subject');

SET @sql := IF(@bestaat = 0,
  'ALTER TABLE `vault_files` ADD CONSTRAINT `fk_vf_subject` FOREIGN KEY (`subject_person_id`) REFERENCES `persons` (`id`) ON DELETE SET NULL',
  'SELECT "fk_vf_subject bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @bestaat := (
  SELECT COUNT(*) FROM information_schema.TABLE_CONSTRAINTS
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'vault_files' AND CONSTRAINT_NAME = 'fk_vf_message');

SET @sql := IF(@bestaat = 0,
  'ALTER TABLE `vault_files` ADD CONSTRAINT `fk_vf_message` FOREIGN KEY (`message_id`) REFERENCES `messages` (`id`) ON DELETE SET NULL',
  'SELECT "fk_vf_message bestaat al" AS melding');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SELECT 'Klaar: foto''s bij personen en berichten toegevoegd aan vault_files.' AS melding;