import tinycolor from 'tinycolor2';
import {oneOf} from '../../utils/assist';

function setAlpha(data, alpha) {
    const color = tinycolor(data);
    const {_a} = color;

    if (_a === undefined || _a === null) {
        color.setAlpha(alpha || 1);
    }

    return color;
}

function getColor(data, colorData) {
    const alpha = colorData && colorData.a;

    if (colorData) {
        // hsl is better than hex between conversions
        if (colorData.hsl) {
            return setAlpha(colorData.hsl, alpha);
        }

        if (colorData.hex && colorData.hex.length > 0) {
            return setAlpha(colorData.hex, alpha);
        }
    }

    return setAlpha(colorData, alpha);
}

export function changeColor(data, oldHue) {
    const colorData = data === '' ? '#2d8cf0' : data;
    const color = getColor(data, colorData);
    const hsl = color.toHsl();
    const hsv = color.toHsv();

    if (hsl.s === 0) {
        hsl.h = colorData.h || (colorData.hsl && colorData.hsl.h) || oldHue || 0;
        hsv.h = hsl.h;
    }

    // when the hsv.v is less than 0.0164 (base on test)
    // because of possible loss of precision
    // the result of hue and saturation would be miscalculated
    if (hsv.v < 0.0164) {
        hsv.h = colorData.h || (colorData.hsv && colorData.hsv.h) || 0;
        hsv.s = colorData.s || (colorData.hsv && colorData.hsv.s) || 0;
    }

    if (hsl.l < 0.01) {
        hsl.h = colorData.h || (colorData.hsl && colorData.hsl.h) || 0;
        hsl.s = colorData.s || (colorData.hsl && colorData.hsl.s) || 0;
    }

    return {
        hsl,
        hex: color.toHexString().toUpperCase(),
        rgba: color.toRgb(),
        hsv,
        oldHue: colorData.h || oldHue || hsl.h,
        source: colorData.source,
        a: colorData.a || color.getAlpha(),
    };
}

export function clamp(value, min, max) {
    if (value < min) {
        return min;
    }

    if (value > max) {
        return max;
    }

    return value;
}

export function getIncrement(key, keys, increment) {
    return oneOf(key, keys) ? increment : 0;
}

export function getTouches(e, prop) {
    return e.touches ? e.touches[0][prop] : 0;
}

export function toRGBAString(rgba) {
    const {r, g, b, a} = rgba;

    return `rgba(${[r, g, b, a].join(',')})`;
}

export function isValidHex(hex) {
    return tinycolor(hex).isValid();
}

function checkIteratee(data, counts, letter) {
    let {checked, passed} = counts;
    const value = data[letter];

    if (value) {
        checked += 1;

        if (Number.isFinite(value)) {
            passed += 1;
        }
    }

    return {checked, passed};
}

const keysToCheck = ['r', 'g', 'b', 'a', 'h', 's', 'l', 'v'];

export function simpleCheckForValidColor(data) {
    const results = keysToCheck.reduce(checkIteratee.bind(null, data), {checked: 0, passed: 0});

    return results.checked === results.passed ? data : undefined;
}