-- +goose Up

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_order_status') = 0,
  'ALTER TABLE disputes ADD COLUMN previous_order_status VARCHAR(32) NOT NULL DEFAULT '''' COMMENT ''申诉前订单状态''',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_handoff_status') = 0,
  'ALTER TABLE disputes ADD COLUMN previous_handoff_status VARCHAR(32) NOT NULL DEFAULT '''' COMMENT ''申诉前交接状态''',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_settlement_status') = 0,
  'ALTER TABLE disputes ADD COLUMN previous_settlement_status VARCHAR(32) NOT NULL DEFAULT '''' COMMENT ''申诉前结算状态''',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'checkout_id') = 0,
  'ALTER TABLE disputes ADD COLUMN checkout_id BIGINT UNSIGNED NULL COMMENT ''关联结账记录ID''',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_checkout_status') = 0,
  'ALTER TABLE disputes ADD COLUMN previous_checkout_status VARCHAR(32) NOT NULL DEFAULT '''' COMMENT ''申诉前结账记录状态''',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.STATISTICS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND INDEX_NAME = 'idx_disputes_checkout_id') = 0,
  'ALTER TABLE disputes ADD KEY idx_disputes_checkout_id (checkout_id)',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- +goose Down

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.STATISTICS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND INDEX_NAME = 'idx_disputes_checkout_id') > 0,
  'ALTER TABLE disputes DROP INDEX idx_disputes_checkout_id',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_checkout_status') > 0,
  'ALTER TABLE disputes DROP COLUMN previous_checkout_status',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'checkout_id') > 0,
  'ALTER TABLE disputes DROP COLUMN checkout_id',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_settlement_status') > 0,
  'ALTER TABLE disputes DROP COLUMN previous_settlement_status',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_handoff_status') > 0,
  'ALTER TABLE disputes DROP COLUMN previous_handoff_status',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @sql = IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'disputes' AND COLUMN_NAME = 'previous_order_status') > 0,
  'ALTER TABLE disputes DROP COLUMN previous_order_status',
  'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;