// ==UserScript==
// @name					fuck易班100分
// @version					1.1
// @description				易班100分模板
// @author					renren0103
// @license					MIT
// @namespace				renren@temp
// @icon                    https://tva1.sinaimg.cn/large/007X1OJgly1h1h8wqvbpnj308c086aah.jpg
// @match					https://app.uyiban.com/anstorm/client/
// @grant					unsafeWindow
// @run-at					document-start
// ==/UserScript==


/**
 * 拦截fetch请求
 */
const fetchHook = () => {
    const originFetch = fetch;
    unsafeWindow.fetch = (url, options) => {
        return originFetch(url, options).then(async (response) => {
            if (url.indexOf("getQuestion") != -1) {
                autoCommit(response.clone())
            }
            if (url.indexOf("answer") != -1) {
                answerRecorder(response.clone(), options)
            }
            return response
        })
    }
}

/**
 * 自动提交
 * @param {请求} response 
 */
const autoCommit = (response) => {
    /**
     * 异步回调导致无法拆分
     */
    response.body.getReader().read().then(res => {
        let data = JSON.parse(Utf8ArrayToStr(res.value))
        let id = data.data.Id
        let answer = []
        answer = answerReader(id)
        setTimeout(() => {
            if (answer != undefined) {
                console.log("匹配到答案：" + answer);
                setTimeout(() => {
                    answer.forEach(answerRaw => {
                        let answerList = getAnswerListFromDom()
                        for (let index = 0; index < answerList.length; index++) {
                            const answerElement = answerList[index];
                            const answerText = getAnswerTextFromElement(answerElement)
                            if (answerText == answerRaw) {
                                answerElement.click()
                            }
                        }
                        setTimeout(() => {
                            autoNext()
                        }, 500)

                    });
                }, 1000)
            } else {
                console.log("未匹配到答案!随机提交");
                let answerList = getAnswerListFromDom()
                answerList[0].click()
                answerList[1].click()
                autoNext()
            }
        }, 1500);
    })
}

const autoNext = () => {
    let nextBtn = document.getElementsByClassName("am-button-primary")
    if (nextBtn.length != 0) {
        nextBtn[0].click();
        if (nextBtn[0] != undefined) {
            nextBtn[0].click();
        }

    }
}

const answerReader = (id) => {
    return JSON.parse(window.localStorage.getItem(id))
}


const answerRecorder = (response, request) => {
    response.body.getReader().read().then(res => {
        let data = JSON.parse(Utf8ArrayToStr(res.value))
        let id = getQuestionId(request.body)
        let answer = findAnswerByOption(data.data.Answer)
        storeAnswer(id, answer)
    })
}

const findAnswerByOption = (options) => {
    let answers = []
    if (options.indexOf("A") != -1) {
        answers.push(findAnswerFromDom(0))
    }
    if (options.indexOf("B") != -1) {
        answers.push(findAnswerFromDom(1))
    }
    if (options.indexOf("C") != -1) {
        answers.push(findAnswerFromDom(2))
    }
    if (options.indexOf("D") != -1) {
        answers.push(findAnswerFromDom(3))
    }
    if (options.indexOf("E") != -1) {
        answers.push(findAnswerFromDom(4))
    }
    if (options.indexOf("F") != -1) {
        answers.push(findAnswerFromDom(5))
    }
    if (options.indexOf("G") != -1) {
        answers.push(findAnswerFromDom(6))
    }
    if (options.indexOf("H") != -1) {
        answers.push(findAnswerFromDom(7))
    }
    return JSON.stringify(answers)
}

const getAnswerListFromDom = () => {
    return document.getElementsByClassName("am-flexbox")
}

const getQuestionId = (s) => {
    return s.substring(s.indexOf("&QuestionId=") + 12, s.indexOf("&Answer="));
}

const findAnswerFromDom = (index) => {
    let answerList = getAnswerListFromDom()
    return getAnswerTextFromElement(answerList[index])
}

const getAnswerTextFromElement = (element) => {
    let spans = element.getElementsByTagName("span")
    return spans[2].innerText
}


const storeAnswer = (key, value) => {
    window.localStorage.setItem(key, value)
}

const Utf8ArrayToStr = (array) => {
    let out, i, len, c;
    let char2, char3;

    out = "";
    len = array.length;
    i = 0;
    while (i < len) {
        c = array[i++];
        switch (c >> 4) {
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
                out += String.fromCharCode(c);
                break;
            case 12: case 13:
                char2 = array[i++];
                out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
                break;
            case 14:
                char2 = array[i++];
                char3 = array[i++];
                out += String.fromCharCode(((c & 0x0F) << 12) |
                    ((char2 & 0x3F) << 6) |
                    ((char3 & 0x3F) << 0));
                break;
        }
    }

    return out;
}


(function () {
    fetchHook()
})();