package u

import (
	"fmt"
	"time"
)

// P 是一个工具函数，用于在表达式内原地创建一个指针
func P[T any](v T) *T {
	return &v
}

func Z[T any](v *T) T {
	if v == nil {
		var zero T
		return zero
	}
	return *v
}

func X[T comparable](v T) *T {
	var zero T
	if v == zero {
		return nil
	}
	return &v
}

func Today() time.Time {
	var now = time.Now()
	return time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
}

func Date(date time.Time) time.Time {
	return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
}

func SameDate(date time.Time) bool {
	var now = time.Now()
	return date.Year() == now.Year() && date.Month() == now.Month() && date.Day() == now.Day()
}

func Or[T any](v *T, or T) T {
	if v == nil {
		return or
	} else {
		return *v
	}
}

func CombineErrors(errs []error) error {
	var combinedErr error = nil
	for _, err := range errs {
		if err != nil {
			if combinedErr == nil {
				combinedErr = err
			} else {
				combinedErr = fmt.Errorf("%v; %w", combinedErr, err)
			}
		}
	}
	return combinedErr
}