package auth

import (
	"testing"
)

// TestHashPassword 测试密码加密
func TestHashPassword(t *testing.T) {
	tests := []struct {
		name      string
		password  string
		wantError bool
	}{
		{
			name:      "正常密码",
			password:  "testpassword123",
			wantError: false,
		},
		{
			name:      "空密码",
			password:  "",
			wantError: false, // bcrypt允许空密码
		},
		{
			name:      "长密码",
			password:  "thisisaverylongpasswordthatexceedsnormallength",
			wantError: false,
		},
		{
			name:      "包含特殊字符的密码",
			password:  "P@ssw0rd!#$%",
			wantError: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			hashed, err := HashPassword(tt.password)
			if (err != nil) != tt.wantError {
				t.Errorf("HashPassword() error = %v, wantError %v", err, tt.wantError)
				return
			}
			if !tt.wantError {
				// 验证哈希值不为空
				if hashed == "" {
					t.Error("HashPassword() 返回的哈希值不应为空")
				}
				// 验证哈希值与原密码不同
				if hashed == tt.password {
					t.Error("HashPassword() 返回的哈希值不应与原密码相同")
				}
				// 验证哈希值长度合理（bcrypt哈希通常是60个字符）
				if len(hashed) < 50 {
					t.Errorf("HashPassword() 返回的哈希值长度异常: %d", len(hashed))
				}
			}
		})
	}
}

// TestCheckPassword 测试密码验证
func TestCheckPassword(t *testing.T) {
	// 先加密一个密码
	password := "testpassword123"
	hashed, err := HashPassword(password)
	if err != nil {
		t.Fatalf("HashPassword() 失败: %v", err)
	}

	tests := []struct {
		name           string
		hashedPassword string
		password       string
		wantMatch      bool
	}{
		{
			name:           "密码匹配",
			hashedPassword: hashed,
			password:       password,
			wantMatch:      true,
		},
		{
			name:           "密码不匹配",
			hashedPassword: hashed,
			password:       "wrongpassword",
			wantMatch:      false,
		},
		{
			name:           "空密码与空哈希",
			hashedPassword: "",
			password:       "",
			wantMatch:      false, // 空哈希无法验证
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := CheckPassword(tt.hashedPassword, tt.password)
			if result != tt.wantMatch {
				t.Errorf("CheckPassword() = %v, want %v", result, tt.wantMatch)
			}
		})
	}
}

// TestHashPassword_Uniqueness 测试每次加密结果不同
func TestHashPassword_Uniqueness(t *testing.T) {
	password := "testpassword123"

	// 多次加密同一密码
	hashes := make(map[string]bool)
	for i := 0; i < 10; i++ {
		hashed, err := HashPassword(password)
		if err != nil {
			t.Fatalf("HashPassword() 失败: %v", err)
		}

		// 验证每次加密的结果都不同（由于salt）
		if hashes[hashed] {
			t.Errorf("第%d次加密的结果与之前重复", i+1)
		}
		hashes[hashed] = true

		// 但都能验证通过
		if !CheckPassword(hashed, password) {
			t.Errorf("第%d次加密的哈希无法验证原密码", i+1)
		}
	}
}

// TestCheckPassword_Consistency 测试密码验证的一致性
func TestCheckPassword_Consistency(t *testing.T) {
	password := "testpassword123"
	hashed, err := HashPassword(password)
	if err != nil {
		t.Fatalf("HashPassword() 失败: %v", err)
	}

	// 多次验证应该结果一致
	for i := 0; i < 10; i++ {
		if !CheckPassword(hashed, password) {
			t.Errorf("第%d次验证失败", i+1)
		}
	}
}