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package theme

import (
	"testing"

	"github.com/charmbracelet/lipgloss"
)

func allThemes() []Theme { return []Theme{FlexokiLight(), FlexokiDark(), Charm()} }

func TestEveryThemeHasAllColorsSet(t *testing.T) {
	for _, th := range allThemes() {
		colors := map[string]lipgloss.Color{
			"Text": th.Text, "Emphasis": th.Emphasis, "Heading": th.Heading, "Code": th.Code,
			"Link": th.Link, "Wikilink": th.Wikilink, "ListMarker": th.ListMarker,
			"Blockquote": th.Blockquote, "Comment": th.Comment, "Accent": th.Accent,
			"Highlight": th.Highlight, "Background": th.Background, "Muted": th.Muted,
			"StatusFg": th.StatusFg, "StatusBg": th.StatusBg, "SelFg": th.SelFg,
			"SelBg": th.SelBg, "Pointer": th.Pointer,
		}
		for name, c := range colors {
			if c == "" {
				t.Errorf("theme %q: color %s is empty", th.Name, name)
			}
		}
		if th.Name == "" {
			t.Error("theme has empty Name")
		}
		if th.GlamourStyle == "" {
			t.Errorf("theme %q has empty GlamourStyle", th.Name)
		}
	}
}

func TestByName(t *testing.T) {
	for _, name := range CycleOrder {
		if _, ok := ByName(name); !ok {
			t.Errorf("ByName(%q) not found", name)
		}
	}
	if _, ok := ByName("nope"); ok {
		t.Error("ByName(nope) should not be found")
	}
}

func TestNextCycles(t *testing.T) {
	if Next("flexoki-light").Name != "flexoki-dark" {
		t.Error("light -> dark")
	}
	if Next("flexoki-dark").Name != "charm" {
		t.Error("dark -> charm")
	}
	if Next("charm").Name != "flexoki-light" {
		t.Error("charm -> light (wrap)")
	}
	// Unknown name starts the cycle at the first entry's successor is well-defined:
	if Next("unknown").Name != CycleOrder[0] {
		t.Errorf("unknown -> %s, want %s", Next("unknown").Name, CycleOrder[0])
	}
}

func TestResolve(t *testing.T) {
	if Resolve("charm").Name != "charm" {
		t.Error("explicit name should resolve to itself")
	}
	// auto and unknown both fall back to OS detection — must be a real registered theme.
	for _, v := range []string{"auto", "", "bogus"} {
		got := Resolve(v)
		if _, ok := ByName(got.Name); !ok {
			t.Errorf("Resolve(%q) returned unregistered theme %q", v, got.Name)
		}
	}
}