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/**

* just for legao

* @author: jiushen

*/

// 需要通过 Env 来判断是否需要

import { some } from 'lodash';

const pseudoMap = ['hover', 'focus', 'active', 'visited'];

const RE_CAMEL = /[A-Z]/g;

const RE_HYPHEN = /[-\s]+(.)?/g;

const CSS_REG = /:root(.*)\{.*/i;

const PROPS_REG = /([^:]*):\s?(.*)/i;

// 给 css 分组

function groupingCss(css) {

let stackLength = 0;

let startIndex = 0;

const group = [];

css.split('').forEach((char, index) => {

if (char === '{') {

stackLength++;

}

if (char === '}') {

if (stackLength === 1) {

group.push(css.substring(startIndex, index + 1));

startIndex = index + 1;

}

stackLength--;

}

});

return group;

}

function isString(str) {

return {}.toString.call(str) === '[object String]';

}

function hyphenate(str) {

return str.replace(RE_CAMEL, w => `-${w}`).toLowerCase();

}

function camelize(str) {

return str.replace(RE_HYPHEN, (m, w) => (w ? w.toUpperCase() : ''));

}

/**

* convert

* {background-color: "red"}

* to

* background-color: red;

*/

function runtimeToCss(runtime) {

const css = [];

Object.keys(runtime).forEach((key) => {

css.push(` ${key}: ${runtime[key]};`);

});

return css.join('\n');

}

function toNativeStyle(runtime) {

if (!runtime) {

return {};

}

if (runtime.default) {

const normalized = {};

Object.keys(runtime).forEach((pseudo) => {

if (pseudo === 'extra') {

normalized[pseudo] = runtime[pseudo];

return;

}

normalized[pseudo] = toNativeStyle(runtime[pseudo]);

});

return normalized;

}

const normalized = {};

Object.keys(runtime).forEach((key) => {

normalized[camelize(key)] = runtime[key];

});

return normalized;

}

function normalizeStyle(style) {

if (!style) {

return {};

}

if (style.default) {

const normalized = {};

Object.keys(style).forEach((pseudo) => {

if (pseudo === 'extra') {

normalized[pseudo] = style[pseudo];

return;

}

normalized[pseudo] = normalizeStyle(style[pseudo]);

});

return normalized;

}

const normalized = {};

Object.keys(style).forEach((key) => {

normalized[hyphenate(key)] = style[key];

});

return normalized;

}

function toCss(runtime) {

if (!runtime) {

return (

`:root {

}`);

}

if (runtime.default) {

const css = [];

Object.keys(runtime).forEach((pseudo) => {

if (pseudo === 'extra') {

Array.isArray(runtime.extra) && css.push(runtime.extra.join('\n'));

return;

}

// 只需要对这四种做兼容

const prefix = pseudoMap.indexOf(pseudo) > -1 ? ':' : '';

css.push(

`:root${pseudo === 'default' ? '' : `${prefix}${pseudo}`} {

${runtimeToCss(normalizeStyle(runtime[pseudo]))}

}\n`,

);

});

return css.join('\n');

}

return (

`:root {

${runtimeToCss(normalizeStyle(runtime))}

}

`

);

}

function cssToRuntime(css) {

if (!css) {

return {};

}

const runtime = {};

const groups = groupingCss(css);

groups.forEach((cssItem) => {

if (!cssItem.startsWith(':root')) {

runtime.extra = runtime.extra || [];

runtime.extra.push(cssItem.trim());

} else {

const res = /:root:?(.*)?{(.*)/ig.exec(cssItem.replace(/[\r\n]+/ig, '').trim());

if (res) {

let pseudo;

if (res[1] && res[1].trim() && some(pseudoMap, pse => res[1].indexOf(pse) === 0)) {

pseudo = res[1].trim();

} else if (res[1] && res[1].trim()) {

pseudo = res[1];

}

const s = {};

res[2].split(';').reduce((prev, next) => {

if (next.indexOf('base64') > -1) {

prev[prev.length - 1] += `;${next}`;

} else {

prev.push(next);

}

return prev;

}, []).forEach((item) => {

if (item) {

if (PROPS_REG.test(item)) {

const props = item.match(PROPS_REG);

const key = props[1];

const value = props[2];

if (key && value) {

s[key.trim()] = value.trim();

}

}

}

});

if (!pseudo) {

pseudo = 'default';

}

runtime[pseudo] = s;

}

}

});

return runtime;

}

function cssToStyle(css) {

try {

if (isString(css)) {

return toNativeStyle(cssToRuntime(css).default);

}

if (css.default) {

return toNativeStyle(normalizeStyle(css.default));

}

return toNativeStyle(normalizeStyle(css));

} catch (e) {

// do nothing

}

return {};

}

export {

hyphenate,

camelize,

toNativeStyle,

normalizeStyle,

toCss,

cssToRuntime,

cssToStyle,

};