package tokens

import (
	"strings"
	"testing"

	"amadan.net/rastrillo/fiesta"
)

// A shadow is the interesting negative. It CONTAINS a colour and is not
// one, it gets a different preview (a card wearing it rather than a
// chip painted with it), and a pattern loose enough to match one would
// silently reclassify all four depth tokens.
func TestColourValueRecognisesADerivedColour(t *testing.T) {
	for _, v := range []string{
		"#fff",
		"#ffffff",
		"rgb(0, 0, 0)",
		"rgba(0, 0, 0, 0.45)",
		"var(--rst-line)",
		"color-mix(in oklab, var(--rst-accent) 18%, var(--rst-line))",
		"color-mix(in oklab, var(--rst-accent) 45%, var(--rst-line))",
		// day's accent derivations: a hue taken from the accent, a mix
		// whose source carries a fallback, and a bare var() with a
		// light-dark() fallback.
		"oklch(from var(--rst-accent, #1f56d6) 0.513 0.21 h)",
		"color-mix(in srgb, var(--rst-accent, #1f56d6) 4.5%, var(--rst-surface))",
		"var(--rst-accent, light-dark(#1f56d6, #7aa2ff))",
	} {
		if !colourValue.MatchString(v) {
			t.Errorf("colourValue does not match %q, so the Tokens page would draw its row with no swatch", v)
		}
	}
	for _, v := range []string{
		"0 8px 24px light-dark(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.5))",
		"0 1px 2px rgba(0, 0, 0, 0.3)",
		"8px",
		"system-ui, -apple-system, sans-serif",
		"999px",
	} {
		if colourValue.MatchString(v) {
			t.Errorf("colourValue matches %q, which is not a colour on its own; a chip painted with it would preview nothing and a shadow would lose the preview it has", v)
		}
	}
}

// lightHalf takes the first half of a whole-value light-dark() and
// leaves everything else alone, a shadow carrying one inside it
// included.
func TestLightHalfSplitsOnlyAWholeValue(t *testing.T) {
	for in, want := range map[string]string{
		"light-dark(#fff, #000)":                                         "#fff",
		"light-dark(rgba(0, 0, 0, 0.12), rgba(255, 255, 255, 0.5))":      "rgba(0, 0, 0, 0.12)",
		"light-dark(color-mix(in oklab, #fff 10%, #000), #000)":          "color-mix(in oklab, #fff 10%, #000)",
		"0 8px 24px light-dark(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.5))": "0 8px 24px light-dark(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.5))",
		"#1f56d6":         "#1f56d6",
		"light-dark(#fff": "light-dark(#fff",
	} {
		if got := lightHalf(in); got != want {
			t.Errorf("lightHalf(%q) = %q, want %q", in, got, want)
		}
	}
}

// Every theme yields the groups the page draws, every colour row in
// them a chip, and nothing lands in "other": a token that does is a
// token nobody filed under a heading.
func TestEveryThemeHasAPaletteAndNothingIsOther(t *testing.T) {
	structure, err := Structural()
	if err != nil {
		t.Fatal(err)
	}
	keys := map[string]int{}
	for _, g := range structure {
		keys[g.Key] = len(g.Rows)
	}
	if keys["type-scale"] == 0 || keys["spacing"] == 0 {
		t.Errorf("Structural: type-scale has %d rows and spacing %d; tokens.css's :root block holds both scales", keys["type-scale"], keys["spacing"])
	}

	for _, theme := range fiesta.ThemeNames() {
		groups, err := Palette(theme)
		if err != nil {
			t.Fatalf("%s: %v", theme, err)
		}
		seen := map[string]bool{}
		for _, g := range groups {
			if seen[g.Key] {
				t.Errorf("%s: the %s group appears twice", theme, g.Key)
			}
			seen[g.Key] = true
			if len(g.Rows) == 0 {
				t.Errorf("%s: the %s group has no rows", theme, g.Key)
			}
			for _, r := range g.Rows {
				if r.Colour && r.Preview == "" {
					t.Errorf("%s: %s is a colour with no preview", theme, r.Name)
				}
				if strings.HasPrefix(r.Value, "light-dark(") && g.Kind == "colour" {
					t.Errorf("%s: %s still reads %q; the palette shows the light half", theme, r.Name, r.Value)
				}
			}
			if g.Key == "other" {
				var names []string
				for _, r := range g.Rows {
					names = append(names, r.Name)
				}
				t.Errorf("%s: %d tokens fell through to \"other\": %v", theme, len(g.Rows), names)
			}
		}
		for _, want := range []string{"surfaces-and-lines", "text", "accent", "status-tones", "depth", "controls", "radius", "type-family"} {
			if !seen[want] {
				t.Errorf("%s: no %s group", theme, want)
			}
		}
	}
}