-- +goose Up
-- Normalize legacy HEMS duty roster artifacts into neutral duty roster naming.

-- 1) Rename legacy tables when old name exists and new name does not.
SET @has_old_rosters := (
  SELECT COUNT(*) FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'hems_duty_rosters'
);
SET @has_new_rosters := (
  SELECT COUNT(*) FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'duty_rosters'
);
SET @sql_rename_rosters := IF(@has_old_rosters = 1 AND @has_new_rosters = 0,
  'RENAME TABLE hems_duty_rosters TO duty_rosters',
  'SELECT 1'
);
PREPARE stmt_rename_rosters FROM @sql_rename_rosters;
EXECUTE stmt_rename_rosters;
DEALLOCATE PREPARE stmt_rename_rosters;

SET @has_old_crews := (
  SELECT COUNT(*) FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'hems_duty_roster_crews'
);
SET @has_new_crews := (
  SELECT COUNT(*) FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'duty_roster_crews'
);
SET @sql_rename_crews := IF(@has_old_crews = 1 AND @has_new_crews = 0,
  'RENAME TABLE hems_duty_roster_crews TO duty_roster_crews',
  'SELECT 1'
);
PREPARE stmt_rename_crews FROM @sql_rename_crews;
EXECUTE stmt_rename_crews;
DEALLOCATE PREPARE stmt_rename_crews;

-- 2) Rename legacy header column.
SET @has_duty_rosters := (
  SELECT COUNT(*) FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'duty_rosters'
);
SET @has_hems_base_id := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'duty_rosters'
    AND COLUMN_NAME = 'hems_base_id'
);
SET @has_base_id := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'duty_rosters'
    AND COLUMN_NAME = 'base_id'
);
SET @sql_rename_base_col := IF(@has_duty_rosters = 1 AND @has_hems_base_id = 1 AND @has_base_id = 0,
  'ALTER TABLE duty_rosters RENAME COLUMN hems_base_id TO base_id',
  'SELECT 1'
);
PREPARE stmt_rename_base_col FROM @sql_rename_base_col;
EXECUTE stmt_rename_base_col;
DEALLOCATE PREPARE stmt_rename_base_col;

-- 3) Ensure confirm_at exists on normalized crews table.
SET @has_confirm_at_new_crews := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'duty_roster_crews'
    AND COLUMN_NAME = 'confirm_at'
);
SET @sql_add_confirm_at_new_crews := IF(@has_new_crews = 1 AND @has_confirm_at_new_crews = 0,
  'ALTER TABLE duty_roster_crews ADD COLUMN confirm_at DATETIME NULL AFTER email',
  'SELECT 1'
);
PREPARE stmt_add_confirm_at_new_crews FROM @sql_add_confirm_at_new_crews;
EXECUTE stmt_add_confirm_at_new_crews;
DEALLOCATE PREPARE stmt_add_confirm_at_new_crews;

-- 4) If legacy crew table still exists, keep it compatible too.
SET @has_confirm_at_old_crews := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'hems_duty_roster_crews'
    AND COLUMN_NAME = 'confirm_at'
);
SET @sql_add_confirm_at_old_crews := IF(@has_old_crews = 1 AND @has_confirm_at_old_crews = 0,
  'ALTER TABLE hems_duty_roster_crews ADD COLUMN confirm_at DATETIME NULL AFTER email',
  'SELECT 1'
);
PREPARE stmt_add_confirm_at_old_crews FROM @sql_add_confirm_at_old_crews;
EXECUTE stmt_add_confirm_at_old_crews;
DEALLOCATE PREPARE stmt_add_confirm_at_old_crews;

-- 5) Normalize legacy FK references to duty_rosters where needed.
SET @fk_roster_crews_ref := (
  SELECT COALESCE(MAX(kcu.REFERENCED_TABLE_NAME), '')
  FROM information_schema.TABLE_CONSTRAINTS tc
  JOIN information_schema.KEY_COLUMN_USAGE kcu
    ON tc.CONSTRAINT_SCHEMA = kcu.CONSTRAINT_SCHEMA
   AND tc.TABLE_NAME = kcu.TABLE_NAME
   AND tc.CONSTRAINT_NAME = kcu.CONSTRAINT_NAME
  WHERE tc.CONSTRAINT_SCHEMA = DATABASE()
    AND tc.TABLE_NAME = 'roster_crews'
    AND tc.CONSTRAINT_TYPE = 'FOREIGN KEY'
    AND tc.CONSTRAINT_NAME = 'fk_roster_crews_roster'
);
SET @sql_rewire_roster_crews_fk := IF(@has_new_rosters = 1 AND @fk_roster_crews_ref = 'hems_duty_rosters',
  'ALTER TABLE roster_crews DROP FOREIGN KEY fk_roster_crews_roster, ADD CONSTRAINT fk_roster_crews_roster FOREIGN KEY (roster_id) REFERENCES duty_rosters(id)',
  'SELECT 1'
);
PREPARE stmt_rewire_roster_crews_fk FROM @sql_rewire_roster_crews_fk;
EXECUTE stmt_rewire_roster_crews_fk;
DEALLOCATE PREPARE stmt_rewire_roster_crews_fk;

SET @fk_other_persons_ref := (
  SELECT COALESCE(MAX(kcu.REFERENCED_TABLE_NAME), '')
  FROM information_schema.TABLE_CONSTRAINTS tc
  JOIN information_schema.KEY_COLUMN_USAGE kcu
    ON tc.CONSTRAINT_SCHEMA = kcu.CONSTRAINT_SCHEMA
   AND tc.TABLE_NAME = kcu.TABLE_NAME
   AND tc.CONSTRAINT_NAME = kcu.CONSTRAINT_NAME
  WHERE tc.CONSTRAINT_SCHEMA = DATABASE()
    AND tc.TABLE_NAME = 'duty_roster_other_persons'
    AND tc.CONSTRAINT_TYPE = 'FOREIGN KEY'
    AND tc.CONSTRAINT_NAME = 'fk_duty_roster_other_persons_roster'
);
SET @sql_rewire_other_persons_fk := IF(@has_new_rosters = 1 AND @fk_other_persons_ref = 'hems_duty_rosters',
  'ALTER TABLE duty_roster_other_persons DROP FOREIGN KEY fk_duty_roster_other_persons_roster, ADD CONSTRAINT fk_duty_roster_other_persons_roster FOREIGN KEY (roster_id) REFERENCES duty_rosters(id)',
  'SELECT 1'
);
PREPARE stmt_rewire_other_persons_fk FROM @sql_rewire_other_persons_fk;
EXECUTE stmt_rewire_other_persons_fk;
DEALLOCATE PREPARE stmt_rewire_other_persons_fk;

-- +goose Down
-- Intentionally no-op: legacy normalization is one-way to keep schema stable.
SELECT 1;