package cf

import (
	"regexp"
	"testing"
)

// Test IsMobile
func TestIsMobile(t *testing.T) {
	valid := []string{
		"13800138000",
		"19999999999",
		"18888888888",
	}
	invalid := []string{
		"23800138000",
		"10000000000",
		"12345",
		"abc13800138000",
		"",
	}

	for _, v := range valid {
		if !IsMobile(v) {
			t.Errorf("IsMobile(%q) = false, want true", v)
		}
	}

	for _, v := range invalid {
		if IsMobile(v) {
			t.Errorf("IsMobile(%q) = true, want false", v)
		}
	}
}

// Test StrRand
func TestStrRand(t *testing.T) {
	length := 16
	s := StrRand(length)
	if len(s) != length {
		t.Errorf("StrRand length = %d, want %d", len(s), length)
	}

	// check character set
	matched, _ := regexp.MatchString(`^[0-9a-zA-Z]+$`, s)
	if !matched {
		t.Errorf("StrRand returned invalid characters: %s", s)
	}
}

// Test StrCharRand
func TestStrCharRand(t *testing.T) {
	length := 10
	s := StrCharRand(length)
	if len(s) != length {
		t.Errorf("StrCharRand length = %d, want %d", len(s), length)
	}
	matched, _ := regexp.MatchString(`^[a-zA-Z]+$`, s)
	if !matched {
		t.Errorf("StrCharRand returned invalid characters: %s", s)
	}
}

// Test StrNumberRand
func TestStrNumberRand(t *testing.T) {
	length := 8
	s := StrNumberRand(length)
	if len(s) != length {
		t.Errorf("StrNumberRand length = %d, want %d", len(s), length)
	}
	matched, _ := regexp.MatchString(`^[0-9]+$`, s)
	if !matched {
		t.Errorf("StrNumberRand returned invalid characters: %s", s)
	}
	if s[0] == '0' {
		t.Errorf("StrNumberRand starts with 0, which is not allowed: %s", s)
	}
}