async Task ValidateAsync(Plan plan)
{
if (!plan.StartDate.HasValue)
{
ModelState.AddModelError("startDate", "必須填寫開始日期");
}
else
{
if (plan.EndDate.HasValue)
{
if (plan.EndDate <= plan.StartDate)
{
ModelState.AddModelError("endDate", "結束日期錯誤");
}
else
{
var existingPlans = (await _plansService.FetchAllAsync()).Where(x => x.Id != plan.Id).ToList();
var hasDateConflict = existingPlans.Where(x => x.HasDateConflict(plan));
if (hasDateConflict.HasItems())
{
ModelState.AddModelError("endDate", "日期與其他方案衝突");
}
}
}
}
if (plan.Money < 150 || plan.Discount > 500)
{
ModelState.AddModelError("money", "金額錯誤");
}
if (plan.Discount < 50 || plan.Discount > 95)
{
ModelState.AddModelError("discount", "折扣錯誤");
}
}