/* 客服主题派生——单品牌色 → 7 槽位色板(spec 2026-08-31 §5)。
 * 注意:此文件与 static/widget.js 内联拷贝必须逐字符一致(空白归一化后),
 * 由 tests/test_theme_static.py 强制;修改务必两边同步。 */
(function (global) {
    "use strict";

    var DEFAULT_COLOR = "#066fc0";

    var DEFAULT_PALETTE = {
        primary: "#066fc0",
        primaryRgb: "6,111,192",
        gradientEnd: "#0666bb",
        deepText: "#14517a",
        captionText: "#2174ab",
        softBg: "#f3f9fe",
        borderSoft: "#bbdcf2"
    };

    function clampNum(v, lo, hi) {
        return Math.min(hi, Math.max(lo, v));
    }

    function hexToRgb(hex) {
        hex = String(hex || "").replace(/^#/, "");
        if (hex.length === 3) {
            hex = hex.split("").map(function (ch) { return ch + ch; }).join("");
        }
        if (!/^[0-9a-fA-F]{6}$/.test(hex)) return null;
        return {
            r: parseInt(hex.slice(0, 2), 16),
            g: parseInt(hex.slice(2, 4), 16),
            b: parseInt(hex.slice(4, 6), 16)
        };
    }

    function rgbToHsl(r, g, b) {
        r /= 255; g /= 255; b /= 255;
        var max = Math.max(r, g, b), min = Math.min(r, g, b);
        var l = (max + min) / 2;
        var d = max - min;
        var h = 0, s = 0;
        if (d !== 0) {
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            if (max === r) h = ((g - b) / d) % 6;
            else if (max === g) h = (b - r) / d + 2;
            else h = (r - g) / d + 4;
            h *= 60;
            if (h < 0) h += 360;
        }
        return { h: h, s: s * 100, l: l * 100 };
    }

    function toHex2(v) {
        var s = Math.round(clampNum(v, 0, 255)).toString(16);
        return s.length < 2 ? "0" + s : s;
    }

    function hslToHex(h, s, l) {
        h = ((h % 360) + 360) % 360;
        s = clampNum(s, 0, 100) / 100;
        l = clampNum(l, 0, 100) / 100;
        var c = (1 - Math.abs(2 * l - 1)) * s;
        var x = c * (1 - Math.abs(((h / 60) % 2) - 1));
        var m = l - c / 2;
        var rp = 0, gp = 0, bp = 0;
        if (h < 60) { rp = c; gp = x; }
        else if (h < 120) { rp = x; gp = c; }
        else if (h < 180) { gp = c; bp = x; }
        else if (h < 240) { gp = x; bp = c; }
        else if (h < 300) { rp = x; bp = c; }
        else { rp = c; bp = x; }
        return "#" + toHex2((rp + m) * 255) + toHex2((gp + m) * 255) + toHex2((bp + m) * 255);
    }

    function derivePalette(color) {
        try {
            var rgb = hexToRgb(color);
            if (!rgb) {
                if (typeof console !== "undefined" && console.warn) console.warn("[chat-theme] invalid color, fallback:", color);
                return DEFAULT_PALETTE;
            }
            var hsl = rgbToHsl(rgb.r, rgb.g, rgb.b);
            var h = hsl.h, s = hsl.s, l = hsl.l;
            return {
                primary: "#" + toHex2(rgb.r) + toHex2(rgb.g) + toHex2(rgb.b),
                primaryRgb: rgb.r + "," + rgb.g + "," + rgb.b,
                gradientEnd: hslToHex(h + 2, s, l - 1),
                deepText: hslToHex(h - 2, s * 0.76, clampNum(l - 24, 28, 40)),
                captionText: hslToHex(h - 2, s * 0.72, clampNum(l - 10, 40, 52)),
                softBg: hslToHex(h, s * 0.9, 97.5),
                borderSoft: hslToHex(h - 2, s * 0.72, 84)
            };
        } catch (e) {
            return DEFAULT_PALETTE;
        }
    }

    global.ChatTheme = {
        derivePalette: derivePalette,
        DEFAULT_COLOR: DEFAULT_COLOR,
        DEFAULT_PALETTE: DEFAULT_PALETTE
    };
})(typeof window !== "undefined" ? window : this);