// ==UserScript==
// @name         HuaWei Table Transformer
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  try to take over the world!
// @author       You
// @match        https://developer.huawei.com/consumer/cn/doc/distribution/promotion/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const convertType = (type) => {
        const isList = type.endsWith('[]')
        if (isList) type = type.substring(0, type.length - 2)
        switch (type.toLowerCase()) {
            case 'long':
            case 'float':
            case 'double':
            case 'int':
            case 'integer': type = 'number'; break
            case 'boolean': type = 'boolean'; break
            case 'string': type = 'string'; break
        }
        if (isList) type += '[]'
        return type
    }
    const parseRow = (row) => {
        const tds = row.querySelectorAll('td')
        if (tds.length < 3 || tds > 4) return ''
        const withOptional = tds.length === 4
        const name = tds[0].innerText.trim()
        if (!name) return ''
        const type = tds[1].innerText.trim()
        const optional = withOptional ? tds[2].innerText === '是' : false
        const comment = tds[withOptional ? 3 : 2].innerText.trim()
        return `  ${name.replace(/\n/g, '')}${optional ? '?' : ''}: ${convertType(type)} // ${comment.replace(/\n/g, ' ')}\n`
    }
    const parseRows = (header, rows) => {
        if (!rows.length) return
        let content = `interface ${header} {\n`
        rows.forEach(row => {
            content += parseRow(row)
        })
        content += '}'
        return content
    }

    const parseTable = (tableDiv) => {
        // Has a header?
        const header = tableDiv.previousElementSibling?.innerText?.trim()
        if (header) {
            const result = document.createElement('pre')
            result.append(document.createTextNode(parseRows(header, tableDiv.querySelectorAll('tr:nth-child(n+2)'))))
            tableDiv.prepend(result)
        }
    }

    const createButton = (container) => {
        container.style.position = 'relative'
        const btn = document.createElement('button')
        btn.append(document.createTextNode('Dump'))
        btn.addEventListener('click', () => {
            parseTable(container)
            btn.remove()
        })
        btn.style.position = 'absolute'
        btn.style.top = '0'
        btn.style.right = '-2em'
        btn.style.zIndex = 10000
        container.prepend(btn)
    }

    const ob = new MutationObserver(mutations => {
        mutations.forEach(({ target }) => {
            if (target?.tagName === 'DIV' && target?.classList?.contains('markdown-body')) {
                target.querySelectorAll('div.tablenoborder').forEach(createButton)
            }
        })
    })
    ob.observe(document.body, { subtree: true, childList: true })

})();