package services

// Pure-Go tests for RenderSpec.

import (
	"errors"
	"testing"
)

func TestRenderSpec_HappyPath(t *testing.T) {
	s := DefaultRenderSpec()
	if err := s.Validate(); err != nil {
		t.Fatalf("default render spec must validate: %v", err)
	}
}

func TestRenderSpec_ShapeMustBeKnown(t *testing.T) {
	cases := []RenderShape{ShapeList, ShapeCards, ShapeCalendar}
	for _, sh := range cases {
		t.Run(string(sh), func(t *testing.T) {
			s := RenderSpec{Shape: sh}
			if err := s.Validate(); err != nil {
				t.Fatalf("shape %q must validate: %v", sh, err)
			}
		})
	}
}

func TestRenderSpec_UnknownShapeRejects(t *testing.T) {
	s := RenderSpec{Shape: "kanban"}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown shape must reject, got %v", err)
	}
}

func TestRenderSpec_ListColumnEnum(t *testing.T) {
	s := RenderSpec{Shape: ShapeList, List: &ListConfig{Columns: []string{"date", "bogus"}}}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown list column must reject, got %v", err)
	}
}

func TestRenderSpec_KnownListColumnsAccepted(t *testing.T) {
	s := RenderSpec{Shape: ShapeList, List: &ListConfig{Columns: KnownListColumns}}
	if err := s.Validate(); err != nil {
		t.Fatalf("known columns must validate: %v", err)
	}
}

func TestRenderSpec_ListSortEnum(t *testing.T) {
	s := RenderSpec{Shape: ShapeList, List: &ListConfig{Sort: "weird"}}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown sort must reject, got %v", err)
	}
}

func TestRenderSpec_ListDensityEnum(t *testing.T) {
	s := RenderSpec{Shape: ShapeList, List: &ListConfig{Density: "huge"}}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown density must reject, got %v", err)
	}
}

func TestRenderSpec_CardsGroupByEnum(t *testing.T) {
	s := RenderSpec{Shape: ShapeCards, Cards: &CardsConfig{GroupBy: "month"}}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown group_by must reject, got %v", err)
	}
}

func TestRenderSpec_CalendarViewEnum(t *testing.T) {
	s := RenderSpec{Shape: ShapeCalendar, Calendar: &CalendarConfig{DefaultView: "year"}}
	if err := s.Validate(); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("unknown default_view must reject, got %v", err)
	}
}

func TestRenderSpec_RoundTrip(t *testing.T) {
	original := RenderSpec{
		Shape: ShapeList,
		List: &ListConfig{
			Columns: []string{"time", "actor", "title", "project"},
			Sort:    SortDateDesc,
			Density: DensityCompact,
		},
		Cards:    &CardsConfig{GroupBy: CardsGroupByDay, Sort: SortDateAsc},
		Calendar: &CalendarConfig{DefaultView: CalendarMonth},
	}
	b, err := MarshalRenderSpec(original)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	parsed, err := UnmarshalRenderSpec(b)
	if err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	if parsed.Shape != original.Shape {
		t.Errorf("shape mismatch: %v vs %v", parsed.Shape, original.Shape)
	}
	if parsed.List == nil || parsed.List.Density != DensityCompact {
		t.Errorf("list config not preserved: %+v", parsed.List)
	}
}