// ==UserScript==
// @name         OceanEngine Table Transformer Kotlin
// @namespace    http://tampermonkey.net/
// @version      2.0
// @description  try to take over the world!
// @author       You
// @match        https://open.oceanengine.com/labels/7/docs/*
// @grant        GM_setClipboard
// @run-at       document-start
// ==/UserScript==

(function() {
    'use strict';
    const makeClassName = s => s?.replace(/(?:_|^)([a-z])/g, g => g.substring(g.length - 1).toUpperCase()) || ''
    const convertType = (type, name) => {
        const isList = type.endsWith('[]')
        if (isList) type = type.substring(0, type.length - 2)
        switch (type.toLowerCase()) {
            case 'float': type = 'Float'; break
            case 'double': type = 'Double'; break
            case 'number':
            case 'int':
            case 'long':
            case 'integer': type = 'Long'; break
            case 'boolean': type = 'Boolean'; break
            case 'string': type = 'String'; break
            case 'json':
            case 'object': type = makeClassName(name) || 'Object'; break
        }
        if (isList) type = `List<${type}>`
        return type
    }
    const parseName = (childNodes) => {
        if (!childNodes) return
        for (const node of childNodes) {
            if (node.nodeType === Node.TEXT_NODE) {
                const text = node.textContent.trim()
                if (text) return text.replace(/\n/g, '')
            }
        }
    }
    const parseRow = (tds) => {
        const name = parseName(tds[0].querySelector('div')?.childNodes)
        if (!name) return ''
        const optional = tds[0].querySelector('span.tag')?.innerText?.trim() !== '必填'
        const type = tds[1].innerText.trim()
        const comment = tds[2].innerText.trim()
        return `  val ${name}: ${convertType(type, name)}${optional ? '? = null' : ''}, // ${comment.replace(/\n/g, ' ')}\n`
    }
    const parseEnumRow = (tds) => {
        const name = parseName(tds[0].querySelector('div')?.childNodes)
        if (!name) return ''
        let safeName = name.toUpperCase().replace(/\n/g, '').replace(/[^A-Z0-9_]/g, '_')
        if (!/^[A-Z]/.test(safeName)) safeName = `_${safeName}`
        const comment = tds[1].innerText.trim()
        return `${name === safeName ? '' : `  @SerializedName("${name}")\n`}  ${safeName}, // ${comment.replace(/\n/g, ' ')}\n`
    }
    const parseTable = (table, selector, parentSelector, result) => {
        const getOuterTitle = () => {
            let node = table.previousElementSibling
            let title = 'Root'
            while (node) {
                if (/^H\d$/.test(node.tagName)) {
                    title = node.innerText.replace(/\s/g, '')
                    break
                }
                node = node.previousElementSibling
            }
            return title
        }
        const boundaries = parentSelector ? Array.from(table.querySelectorAll(parentSelector)).map(node => [parseName(node.querySelector('div.tdData').childNodes)?.replace(/(?:_|^)([a-z])/g, g => g.substring(g.length - 1).toUpperCase()), node]) : [[getOuterTitle(), null]] // [title as string, boundary as Node]
        console.log(boundaries)
        const isEnum = table.querySelector('th')?.innerText?.trim() === '值'
        const closingTag = isEnum ? '}' : ')'
        let content = ''
        table.querySelectorAll(selector).forEach(row => {
            const prevNode = row.previousSibling
            const boundary = boundaries.find(b => prevNode === b[1])
            if (boundary) {
                if (content) {
                    // not first entity, close current item
                    content += closingTag + '\n'
                }
                const title = boundary[0]
                content += isEnum ? `enum class ${title} {\n` : `data class ${title} (\n`
            }
            content += (isEnum ? parseEnumRow : parseRow)(row.querySelectorAll('td'))
        })
        if (content) content += closingTag
        result.innerText = content
        result.style.display = ''
        GM_setClipboard(result.innerText)
    }

    const ENUM_HINT = ['允许值', '枚举值']

    const hasEnumHit = s => ENUM_HINT.some(hint => s?.includes?.(hint))

    const processEnumerationNode = (node) => {
        if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'CODE') {
            if (node.previousSibling?.tagName !== 'BR') node.parentNode.insertBefore(document.createElement('br'), node)
            node.innerText = node.innerText.replace(/["'\s]/g, '')
        } else if (node.nodeType === Node.TEXT_NODE && node.previousSibling?.tagName === 'CODE') {
            const comment = node.textContent.trim().replace(/、|，|,$/g, '')
            node.textContent = comment ? `,\u00A0//\u00A0${comment}` : ','
        }
    }

    const formatEnumerations = (table) => {
        table.querySelectorAll('tr > td:nth-child(3) > div').forEach(div => {
            if (hasEnumHit(div.innerText)) {
                // 提示模式 允许值：blahblah
                let started = false
                let node = div.childNodes[0]
                while (node) {
                    if (started) {
                        processEnumerationNode(node)
                    } else if (node.nodeType === Node.TEXT_NODE && hasEnumHit(node.textContent)) {
                        started = true
                    }
                    node = node.nextSibling
                }
            } else {
                // 行首模式
                let node = div.querySelector('br + code')
                if (node?.previousSibling?.tagName !== 'BR') return
                while (node) {
                    processEnumerationNode(node)
                    node = node.nextSibling
                }
            }
        })
    }

    const createButton = (table) => {
        if (table.dataset.done) return
        table.dataset.done = true
        formatEnumerations(table)
        const levels = Array.from(table.querySelectorAll('tr')).reduce((s, row) => {
            if (row.className) s.add(row.className)
            return s
        }, new Set())
        const container = document.createElement('div')
        const result = document.createElement('pre')
        result.style.display = 'none'
        table.parentNode.insertBefore(container, table)
        table.parentNode.insertBefore(result, table)
        const addBtn = (level, parentLevel) => {
            const btn = document.createElement('button')
            btn.append(document.createTextNode(level))
            btn.addEventListener('click', () => parseTable(table, `tbody > tr.${level}`, parentLevel ? `tbody > tr.${parentLevel}` : undefined, result))
            container.append(btn)
        }
        Array.from(levels.values()).forEach((lv, i, a) => addBtn(lv, a[i - 1]))
    }

    const ob = new MutationObserver(mutations => {
        mutations.forEach(({ target }) => {
            if (target?.tagName === 'DIV' && target?.classList?.contains('doc-content-body')) {
                target.querySelectorAll('table').forEach(createButton)
            }
        })
    })
    ob.observe(document.body, { subtree: true, childList: true })
    setTimeout(() => document.querySelectorAll('table').forEach(createButton), 3000)
})();