package validator

import (
	"testing"

	govalidator "github.com/go-playground/validator/v10"
)

func TestValidatePasswordComplexity(t *testing.T) {
	tests := []struct {
		name     string
		password string
		valid    bool
	}{
		{"valid password", "Password1", true},
		{"valid complex password", "MyP@ssw0rd!", true},
		{"missing uppercase", "password1", false},
		{"missing lowercase", "PASSWORD1", false},
		{"missing digit", "Password", false},
		{"only digits", "12345678", false},
		{"only lowercase", "abcdefgh", false},
		{"only uppercase", "ABCDEFGH", false},
		{"empty string", "", false},
		{"single valid char each", "aA1", true},
		{"unicode uppercase with digit and lower", "Über1abc", true},
	}

	v := govalidator.New()
	v.RegisterValidation("password_complexity", validatePasswordComplexity)

	type testStruct struct {
		Password string `validate:"password_complexity"`
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			s := testStruct{Password: tc.password}
			err := v.Struct(s)
			if tc.valid && err != nil {
				t.Errorf("expected password %q to be valid, got error: %v", tc.password, err)
			}
			if !tc.valid && err == nil {
				t.Errorf("expected password %q to be invalid, got nil error", tc.password)
			}
		})
	}
}

func TestValidatePasswordComplexityWithMinLength(t *testing.T) {
	v := govalidator.New()
	v.RegisterValidation("password_complexity", validatePasswordComplexity)

	type request struct {
		Password string `validate:"required,min=8,password_complexity"`
	}

	tests := []struct {
		name     string
		password string
		valid    bool
	}{
		{"valid 8+ chars with complexity", "Abcdefg1", true},
		{"too short but complex", "Ab1", false},
		{"long but no uppercase", "abcdefgh1", false},
		{"long but no lowercase", "ABCDEFGH1", false},
		{"long but no digit", "Abcdefghi", false},
		{"empty", "", false},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			r := request{Password: tc.password}
			err := v.Struct(r)
			if tc.valid && err != nil {
				t.Errorf("expected %q to be valid, got error: %v", tc.password, err)
			}
			if !tc.valid && err == nil {
				t.Errorf("expected %q to be invalid, got nil", tc.password)
			}
		})
	}
}

func TestFormatMessagePasswordComplexity(t *testing.T) {
	cv := NewCustomValidator()

	type request struct {
		Password string `json:"password" validate:"required,min=8,password_complexity"`
	}

	r := request{Password: "lowercase1"}
	err := cv.Validate(r)
	if err == nil {
		t.Fatal("expected validation error for password without uppercase")
	}

	resp := FormatValidationErrors(err)
	if resp == nil {
		t.Fatal("expected non-nil error response")
	}

	field, ok := resp.Fields["password"]
	if !ok {
		t.Fatal("expected 'password' field in error response")
	}

	expectedMsg := "Password must be at least 8 characters with at least one uppercase letter, one lowercase letter, and one digit"
	if field.Message != expectedMsg {
		t.Errorf("expected message %q, got %q", expectedMsg, field.Message)
	}

	if field.Tag != "password_complexity" {
		t.Errorf("expected tag 'password_complexity', got %q", field.Tag)
	}
}