crepuscularity-native 0.3.2

//! Full Tailwind v3 named color palette.
//!
//! Usage: `lookup_named_color("slate-500")` → `Some("#64748b")`

/// Look up a Tailwind named color like `"slate-500"` or `"red-100"`.
/// Returns the hex string (with `#` prefix) or `None` if not found.
pub fn lookup_named_color(name: &str) -> Option<&'static str> {
    Some(match name {
        // ── Slate ────────────────────────────────────────────────────────
        "slate-50" => "#f8fafc",
        "slate-100" => "#f1f5f9",
        "slate-200" => "#e2e8f0",
        "slate-300" => "#cbd5e1",
        "slate-400" => "#94a3b8",
        "slate-500" => "#64748b",
        "slate-600" => "#475569",
        "slate-700" => "#334155",
        "slate-800" => "#1e293b",
        "slate-900" => "#0f172a",
        "slate-950" => "#020617",
        // ── Gray ─────────────────────────────────────────────────────────
        "gray-50" => "#f9fafb",
        "gray-100" => "#f3f4f6",
        "gray-200" => "#e5e7eb",
        "gray-300" => "#d1d5db",
        "gray-400" => "#9ca3af",
        "gray-500" => "#6b7280",
        "gray-600" => "#4b5563",
        "gray-700" => "#374151",
        "gray-800" => "#1f2937",
        "gray-900" => "#111827",
        "gray-950" => "#030712",
        // ── Zinc ─────────────────────────────────────────────────────────
        "zinc-50" => "#fafafa",
        "zinc-100" => "#f4f4f5",
        "zinc-200" => "#e4e4e7",
        "zinc-300" => "#d4d4d8",
        "zinc-400" => "#a1a1aa",
        "zinc-500" => "#71717a",
        "zinc-600" => "#52525b",
        "zinc-700" => "#3f3f46",
        "zinc-800" => "#27272a",
        "zinc-900" => "#18181b",
        "zinc-950" => "#09090b",
        // ── Neutral ──────────────────────────────────────────────────────
        "neutral-50" => "#fafafa",
        "neutral-100" => "#f5f5f5",
        "neutral-200" => "#e5e5e5",
        "neutral-300" => "#d4d4d4",
        "neutral-400" => "#a3a3a3",
        "neutral-500" => "#737373",
        "neutral-600" => "#525252",
        "neutral-700" => "#404040",
        "neutral-800" => "#262626",
        "neutral-900" => "#171717",
        "neutral-950" => "#0a0a0a",
        // ── Stone ────────────────────────────────────────────────────────
        "stone-50" => "#fafaf9",
        "stone-100" => "#f5f5f4",
        "stone-200" => "#e7e5e4",
        "stone-300" => "#d6d3d1",
        "stone-400" => "#a8a29e",
        "stone-500" => "#78716c",
        "stone-600" => "#57534e",
        "stone-700" => "#44403c",
        "stone-800" => "#292524",
        "stone-900" => "#1c1917",
        "stone-950" => "#0c0a09",
        // ── Red ──────────────────────────────────────────────────────────
        "red-50" => "#fef2f2",
        "red-100" => "#fee2e2",
        "red-200" => "#fecaca",
        "red-300" => "#fca5a5",
        "red-400" => "#f87171",
        "red-500" => "#ef4444",
        "red-600" => "#dc2626",
        "red-700" => "#b91c1c",
        "red-800" => "#991b1b",
        "red-900" => "#7f1d1d",
        "red-950" => "#450a0a",
        // ── Orange ───────────────────────────────────────────────────────
        "orange-50" => "#fff7ed",
        "orange-100" => "#ffedd5",
        "orange-200" => "#fed7aa",
        "orange-300" => "#fdba74",
        "orange-400" => "#fb923c",
        "orange-500" => "#f97316",
        "orange-600" => "#ea580c",
        "orange-700" => "#c2410c",
        "orange-800" => "#9a3412",
        "orange-900" => "#7c2d12",
        "orange-950" => "#431407",
        // ── Amber ────────────────────────────────────────────────────────
        "amber-50" => "#fffbeb",
        "amber-100" => "#fef3c7",
        "amber-200" => "#fde68a",
        "amber-300" => "#fcd34d",
        "amber-400" => "#fbbf24",
        "amber-500" => "#f59e0b",
        "amber-600" => "#d97706",
        "amber-700" => "#b45309",
        "amber-800" => "#92400e",
        "amber-900" => "#78350f",
        "amber-950" => "#451a03",
        // ── Yellow ───────────────────────────────────────────────────────
        "yellow-50" => "#fefce8",
        "yellow-100" => "#fef9c3",
        "yellow-200" => "#fef08a",
        "yellow-300" => "#fde047",
        "yellow-400" => "#facc15",
        "yellow-500" => "#eab308",
        "yellow-600" => "#ca8a04",
        "yellow-700" => "#a16207",
        "yellow-800" => "#854d0e",
        "yellow-900" => "#713f12",
        "yellow-950" => "#422006",
        // ── Lime ─────────────────────────────────────────────────────────
        "lime-50" => "#f7fee7",
        "lime-100" => "#ecfccb",
        "lime-200" => "#d9f99d",
        "lime-300" => "#bef264",
        "lime-400" => "#a3e635",
        "lime-500" => "#84cc16",
        "lime-600" => "#65a30d",
        "lime-700" => "#4d7c0f",
        "lime-800" => "#3f6212",
        "lime-900" => "#365314",
        "lime-950" => "#1a2e05",
        // ── Green ────────────────────────────────────────────────────────
        "green-50" => "#f0fdf4",
        "green-100" => "#dcfce7",
        "green-200" => "#bbf7d0",
        "green-300" => "#86efac",
        "green-400" => "#4ade80",
        "green-500" => "#22c55e",
        "green-600" => "#16a34a",
        "green-700" => "#15803d",
        "green-800" => "#166534",
        "green-900" => "#14532d",
        "green-950" => "#052e16",
        // ── Emerald ──────────────────────────────────────────────────────
        "emerald-50" => "#ecfdf5",
        "emerald-100" => "#d1fae5",
        "emerald-200" => "#a7f3d0",
        "emerald-300" => "#6ee7b7",
        "emerald-400" => "#34d399",
        "emerald-500" => "#10b981",
        "emerald-600" => "#059669",
        "emerald-700" => "#047857",
        "emerald-800" => "#065f46",
        "emerald-900" => "#064e3b",
        "emerald-950" => "#022c22",
        // ── Teal ─────────────────────────────────────────────────────────
        "teal-50" => "#f0fdfa",
        "teal-100" => "#ccfbf1",
        "teal-200" => "#99f6e4",
        "teal-300" => "#5eead4",
        "teal-400" => "#2dd4bf",
        "teal-500" => "#14b8a6",
        "teal-600" => "#0d9488",
        "teal-700" => "#0f766e",
        "teal-800" => "#115e59",
        "teal-900" => "#134e4a",
        "teal-950" => "#042f2e",
        // ── Cyan ─────────────────────────────────────────────────────────
        "cyan-50" => "#ecfeff",
        "cyan-100" => "#cffafe",
        "cyan-200" => "#a5f3fc",
        "cyan-300" => "#67e8f9",
        "cyan-400" => "#22d3ee",
        "cyan-500" => "#06b6d4",
        "cyan-600" => "#0891b2",
        "cyan-700" => "#0e7490",
        "cyan-800" => "#155e75",
        "cyan-900" => "#164e63",
        "cyan-950" => "#083344",
        // ── Sky ──────────────────────────────────────────────────────────
        "sky-50" => "#f0f9ff",
        "sky-100" => "#e0f2fe",
        "sky-200" => "#bae6fd",
        "sky-300" => "#7dd3fc",
        "sky-400" => "#38bdf8",
        "sky-500" => "#0ea5e9",
        "sky-600" => "#0284c7",
        "sky-700" => "#0369a1",
        "sky-800" => "#075985",
        "sky-900" => "#0c4a6e",
        "sky-950" => "#082f49",
        // ── Blue ─────────────────────────────────────────────────────────
        "blue-50" => "#eff6ff",
        "blue-100" => "#dbeafe",
        "blue-200" => "#bfdbfe",
        "blue-300" => "#93c5fd",
        "blue-400" => "#60a5fa",
        "blue-500" => "#3b82f6",
        "blue-600" => "#2563eb",
        "blue-700" => "#1d4ed8",
        "blue-800" => "#1e40af",
        "blue-900" => "#1e3a8a",
        "blue-950" => "#172554",
        // ── Indigo ───────────────────────────────────────────────────────
        "indigo-50" => "#eef2ff",
        "indigo-100" => "#e0e7ff",
        "indigo-200" => "#c7d2fe",
        "indigo-300" => "#a5b4fc",
        "indigo-400" => "#818cf8",
        "indigo-500" => "#6366f1",
        "indigo-600" => "#4f46e5",
        "indigo-700" => "#4338ca",
        "indigo-800" => "#3730a3",
        "indigo-900" => "#312e81",
        "indigo-950" => "#1e1b4b",
        // ── Violet ───────────────────────────────────────────────────────
        "violet-50" => "#f5f3ff",
        "violet-100" => "#ede9fe",
        "violet-200" => "#ddd6fe",
        "violet-300" => "#c4b5fd",
        "violet-400" => "#a78bfa",
        "violet-500" => "#8b5cf6",
        "violet-600" => "#7c3aed",
        "violet-700" => "#6d28d9",
        "violet-800" => "#5b21b6",
        "violet-900" => "#4c1d95",
        "violet-950" => "#2e1065",
        // ── Purple ───────────────────────────────────────────────────────
        "purple-50" => "#faf5ff",
        "purple-100" => "#f3e8ff",
        "purple-200" => "#e9d5ff",
        "purple-300" => "#d8b4fe",
        "purple-400" => "#c084fc",
        "purple-500" => "#a855f7",
        "purple-600" => "#9333ea",
        "purple-700" => "#7e22ce",
        "purple-800" => "#6b21a8",
        "purple-900" => "#581c87",
        "purple-950" => "#3b0764",
        // ── Fuchsia ──────────────────────────────────────────────────────
        "fuchsia-50" => "#fdf4ff",
        "fuchsia-100" => "#fae8ff",
        "fuchsia-200" => "#f5d0fe",
        "fuchsia-300" => "#f0abfc",
        "fuchsia-400" => "#e879f9",
        "fuchsia-500" => "#d946ef",
        "fuchsia-600" => "#c026d3",
        "fuchsia-700" => "#a21caf",
        "fuchsia-800" => "#86198f",
        "fuchsia-900" => "#701a75",
        "fuchsia-950" => "#4a044e",
        // ── Pink ─────────────────────────────────────────────────────────
        "pink-50" => "#fdf2f8",
        "pink-100" => "#fce7f3",
        "pink-200" => "#fbcfe8",
        "pink-300" => "#f9a8d4",
        "pink-400" => "#f472b6",
        "pink-500" => "#ec4899",
        "pink-600" => "#db2777",
        "pink-700" => "#be185d",
        "pink-800" => "#9d174d",
        "pink-900" => "#831843",
        "pink-950" => "#500724",
        // ── Rose ─────────────────────────────────────────────────────────
        "rose-50" => "#fff1f2",
        "rose-100" => "#ffe4e6",
        "rose-200" => "#fecdd3",
        "rose-300" => "#fda4af",
        "rose-400" => "#fb7185",
        "rose-500" => "#f43f5e",
        "rose-600" => "#e11d48",
        "rose-700" => "#be123c",
        "rose-800" => "#9f1239",
        "rose-900" => "#881337",
        "rose-950" => "#4c0519",
        _ => return None,
    })
}

/// Parse an opacity suffix like `/50` → `0.5`, `/75` → `0.75`.
/// Returns `None` if not present or invalid.
pub fn parse_opacity_suffix(s: &str) -> Option<f32> {
    let n: u8 = s.parse().ok()?;
    if n > 100 {
        return None;
    }
    Some(n as f32 / 100.0)
}

/// Resolve any CSS-style color string to RGBA float components (0.0–1.0 each).
///
/// Resolution order:
/// 1. Basic CSS named colors (`red`, `blue`, `green`, `white`, `black`,
///    `gray`/`grey`, `clear`/`transparent`, `orange`, `yellow`, `purple`, `pink`)
/// 2. Full Tailwind v3 palette names (`red-500`, `slate-700`, etc.) via [`lookup_named_color`]
/// 3. Hex literals: `#rrggbb` (alpha = 1.0) and `#rrggbbaa`
///
/// Returns `None` for unrecognised strings. Callers should handle semantic tokens like
/// `"primary"` and `"secondary"` themselves before calling this function.
pub fn resolve_rgba(css: &str) -> Option<[f32; 4]> {
    let lower = css.trim().to_lowercase();
    match lower.as_str() {
        "red" => return Some([1.0, 0.0, 0.0, 1.0]),
        "blue" => return Some([0.0, 0.0, 1.0, 1.0]),
        "green" => return Some([0.0, 0.502, 0.0, 1.0]),
        "white" => return Some([1.0, 1.0, 1.0, 1.0]),
        "black" => return Some([0.0, 0.0, 0.0, 1.0]),
        "gray" | "grey" => return Some([0.502, 0.502, 0.502, 1.0]),
        "clear" | "transparent" => return Some([0.0, 0.0, 0.0, 0.0]),
        "orange" => return Some([1.0, 0.647, 0.0, 1.0]),
        "yellow" => return Some([1.0, 1.0, 0.0, 1.0]),
        "purple" => return Some([0.502, 0.0, 0.502, 1.0]),
        "pink" => return Some([1.0, 0.753, 0.796, 1.0]),
        _ => {}
    }

    // Try Tailwind palette (e.g. "red-500" → "#ef4444")
    if let Some(hex) = lookup_named_color(lower.as_str()) {
        return parse_hex_rgba(hex);
    }

    // Hex literal (#rrggbb or #rrggbbaa)
    if lower.starts_with('#') {
        return parse_hex_rgba(lower.as_str());
    }

    None
}

fn parse_hex_rgba(s: &str) -> Option<[f32; 4]> {
    let hex = s.trim_start_matches('#');
    match hex.len() {
        6 => {
            let n = u32::from_str_radix(hex, 16).ok()?;
            Some([
                ((n >> 16) & 0xFF) as f32 / 255.0,
                ((n >> 8) & 0xFF) as f32 / 255.0,
                (n & 0xFF) as f32 / 255.0,
                1.0,
            ])
        }
        8 => {
            let n = u32::from_str_radix(hex, 16).ok()?;
            Some([
                ((n >> 24) & 0xFF) as f32 / 255.0,
                ((n >> 16) & 0xFF) as f32 / 255.0,
                ((n >> 8) & 0xFF) as f32 / 255.0,
                (n & 0xFF) as f32 / 255.0,
            ])
        }
        _ => None,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn basic_named() {
        let [r, g, b, a] = resolve_rgba("red").unwrap();
        assert_eq!([r, g, b, a], [1.0, 0.0, 0.0, 1.0]);
    }

    #[test]
    fn tailwind_named() {
        // slate-500 = #64748b
        let [r, g, b, a] = resolve_rgba("slate-500").unwrap();
        assert!((r - 0x64 as f32 / 255.0).abs() < 0.01);
        assert!((g - 0x74 as f32 / 255.0).abs() < 0.01);
        assert!((b - 0x8b as f32 / 255.0).abs() < 0.01);
        assert_eq!(a, 1.0);
    }

    #[test]
    fn hex6() {
        let [r, g, b, a] = resolve_rgba("#ff0000").unwrap();
        assert_eq!([r, g, b, a], [1.0, 0.0, 0.0, 1.0]);
    }

    #[test]
    fn hex8_alpha() {
        let [r, g, b, a] = resolve_rgba("#ff000080").unwrap();
        assert!((r - 1.0).abs() < 0.01);
        assert!(g.abs() < 0.01);
        assert!(b.abs() < 0.01);
        assert!((a - 0.502).abs() < 0.01);
    }

    #[test]
    fn transparent() {
        let [_, _, _, a] = resolve_rgba("transparent").unwrap();
        assert_eq!(a, 0.0);
    }

    #[test]
    fn unknown_returns_none() {
        assert!(resolve_rgba("primary").is_none());
        assert!(resolve_rgba("secondary").is_none());
        assert!(resolve_rgba("chartreuse-deluxe").is_none());
    }

    #[test]
    fn case_insensitive() {
        assert!(resolve_rgba("RED").is_some());
        assert!(resolve_rgba("Slate-500").is_some());
        assert!(resolve_rgba("#FF0000").is_some());
    }
}