package mapper_test

import (
	"testing"

	"git.ma-al.com/goc_marek/timetracker/app/utils/mapper"
)

// --- example structs ---

type UserInput struct {
	Name  string
	Email string
	Age   int
}

type UserRecord struct {
	Name      string
	Email     string
	Age       int
	CreatedAt string // not in src → stays ""
	Active    bool   // not in src → stays false
}

// --- tests ---

func TestMap_MatchingFields(t *testing.T) {
	src := &UserInput{Name: "Alice", Email: "alice@example.com", Age: 30}
	dst := &UserRecord{}

	if err := mapper.Map(dst, src); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if dst.Name != "Alice" {
		t.Errorf("Name: want Alice, got %s", dst.Name)
	}
	if dst.Email != "alice@example.com" {
		t.Errorf("Email: want alice@example.com, got %s", dst.Email)
	}
	if dst.Age != 30 {
		t.Errorf("Age: want 30, got %d", dst.Age)
	}
}

func TestMap_UnmatchedFieldsAreZero(t *testing.T) {
	src := &UserInput{Name: "Bob"}
	dst := &UserRecord{}

	mapper.MustMap(dst, src)

	if dst.CreatedAt != "" {
		t.Errorf("CreatedAt: expected empty string, got %q", dst.CreatedAt)
	}
	if dst.Active != false {
		t.Errorf("Active: expected false, got %v", dst.Active)
	}
}

func TestMap_TypeConversion(t *testing.T) {
	type Src struct{ Score int32 }
	type Dst struct{ Score int64 }

	src := &Src{Score: 99}
	dst := &Dst{}

	mapper.MustMap(dst, src)

	if dst.Score != 99 {
		t.Errorf("Score: want 99, got %d", dst.Score)
	}
}

func TestMap_InvalidInput(t *testing.T) {
	if err := mapper.Map("not a struct", 42); err == nil {
		t.Error("expected error for non-struct inputs")
	}
}