// brightness.js — pure brightness logic: clamp, percent, role thresholds.
// NO I/O. Dual-mode: node `require` (tests) + QML import. Same pattern as clip.js/audio.js.

// --- clamp a level to 0..1, null/NaN-safe ---
function clampLevel(value) {
    var n = Number(value);
    if (!isFinite(n)) return 0;
    return n < 0 ? 0 : (n > 1 ? 1 : n);
}

// --- integer percent 0..100 for a level ---
function levelPercent(value) {
    return Math.round(clampLevel(value) * 100);
}

// --- compact/bar role color token by level band:
// dim (<=15%) -> ui.minor, bright (>=85%) -> warning, else ui.accent ---
function levelRole(value) {
    var v = clampLevel(value);
    if (v <= 0.15) return "ui.minor";
    if (v >= 0.85) return "warning";
    return "ui.accent";
}

function outputArray(outputs) {
    if (Array.isArray(outputs)) return outputs;
    var obj = outputs || {};
    return Object.keys(obj).map(function (name) {
        var row = obj[name] || {};
        var copy = {};
        Object.keys(row).forEach(function (key) { copy[key] = row[key]; });
        copy.name = copy.name || name;
        return copy;
    });
}

function displayName(output) {
    var name = String(output.name || "display");
    var model = String(output.model || "");
    return model.length > 0 && model !== "Unknown" ? name + " · " + model : name;
}

function displayRows(backlight, outputs, ddc) {
    var rows = [];
    var b = backlight || {};
    if (b.present) {
        rows.push({
            id: "backlight",
            name: "built-in",
            kind: "backlight",
            level: clampLevel(b.level),
            controllable: true,
            issue: ""
        });
    }

    var ddcMap = ddc || {};
    outputArray(outputs).forEach(function (output) {
        var key = String(output.name || "");
        // Internal connectors use the backlight row, never DDC setup.
        if (key.length === 0 || /^(eDP|LVDS|DSI)-[0-9]+$/.test(key)) return;
        var state = ddcMap[key] || {};
        var ok = !!state.controllable;
        rows.push({
            id: "ddc:" + key,
            name: displayName(output),
            kind: "ddc",
            level: ok ? clampLevel(state.level) : 0,
            controllable: ok,
            issue: ok ? "" : "DDC?"
        });
    });
    return rows;
}

function globalState(rows) {
    var levels = (rows || []).filter(function (row) {
        return !!row.controllable;
    }).map(function (row) {
        return Math.round(clampLevel(row.level) * 100) / 100;
    });
    if (levels.length === 0) return { mode: "none", level: 0, levels: [] };

    var first = levels[0];
    var mixed = levels.some(function (level) { return level !== first; });
    if (!mixed) return { mode: "synced", level: first, levels: levels };

    var sum = levels.reduce(function (a, b) { return a + b; }, 0);
    return { mode: "mixed", level: Math.round(sum / levels.length * 100) / 100, levels: levels };
}

if (typeof module !== 'undefined' && module.exports) {
    module.exports = { clampLevel: clampLevel, levelPercent: levelPercent,
        levelRole: levelRole, displayRows: displayRows, globalState: globalState };
}