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;(() => {
    class OwO {
        constructor(option) {
            const defaultOption = {
                container: document.getElementsByClassName('OwO')[0],
                target: document.getElementsByTagName('textarea')[0],
                position: 'down',
                width: '100%',
                maxHeight: '250px',
                api: 'https://api.anotherhome.net/OwO/OwO.json'
            }
            for (let defaultKey in defaultOption) {
                if (defaultOption.hasOwnProperty(defaultKey) && !option.hasOwnProperty(defaultKey)) {
                    option[defaultKey] = defaultOption[defaultKey]
                }
            }
            this.container = option.container
            this.target = option.target
            if (option.position === 'up') {
                this.container.classList.add('OwO-up')
            }
            const xhr = new XMLHttpRequest()
            xhr.onreadystatechange = () => {
                if (xhr.readyState === 4) {
                    if ((xhr.status >= 200 && xhr.status < 300) || xhr.status === 304) {
                        this.odata = JSON.parse(xhr.responseText)
                        this.init(option)
                    } else {
                        console.log('OwO data request was unsuccessful: ' + xhr.status)
                    }
                }
            }
            xhr.open('get', option.api, true)
            xhr.send(null)
        }
 
        init(option) {
            this.area = option.target
            this.packages = Object.keys(this.odata)
 
            // fill in HTML
            let html = `
            <div class="OwO-logo"><span>OωO</span></div>
            <div class="OwO-body" style="width: ${option.width}"><div class="OwO-jio"></div>`
 
            for (let i = 0; i < this.packages.length; i++) {
                html += `
                <ul class="OwO-items OwO-items-${this.odata[this.packages[i]].type}" style="max-height: ${parseInt(option.maxHeight) - 53 + 'px'};">`
                var type = this.odata[this.packages[i]].type
                let opackage = this.odata[this.packages[i]].container
                for (let i = 0; i < opackage.length; i++) {
                    if (type == 'image') {
                        html += `
                    <li class="OwO-item" data-id="${opackage[i].data}" title="${opackage[i].text}"><img class="biaoqing ${opackage[i].css}" src="${Config.themeUrl+opackage[i].icon}"></li>`
                    } else {
                        html += `
                    <li class="OwO-item" data-id="not-given" title="${opackage[i].text}">${opackage[i].icon}</li>`
                    } 
                }
 
                html += `
                </ul>`
            }
 
            html += `
                <div class="OwO-bar">
                    <ul class="OwO-packages">`
 
            for (let i = 0; i < this.packages.length; i++) {
                html += `
                        <li><span>${this.packages[i]}</span></li>`
            }
 
            html += `
                    </ul>
                </div>
            </div>
            `
            this.container.innerHTML = html
 
            // bind event
            this.logo = document.getElementsByClassName('OwO-logo')[0]
            this.logo.addEventListener('click', e => {
                e.stopPropagation()
                this.toggle()
            })
 
            this.container.getElementsByClassName('OwO-body')[0].addEventListener('click', e => {
                let target = null
                if (e.target.classList.contains('OwO-item')) {
                    target = e.target
                } else if (e.target.parentNode.classList.contains('OwO-item')) {
                    target = e.target.parentNode
                }
                if (target) {
                    const cursorPos = this.area.selectionEnd
                    let areaValue = this.area.value
                    //this.area.value = areaValue.slice(0, cursorPos) + target.innerHTML + areaValue.slice(cursorPos);
                    if (target.dataset.id == 'not-given') {
                        this.area.value = areaValue.slice(0, cursorPos) + target.innerHTML + areaValue.slice(cursorPos)
                    } else {
                        this.area.value = areaValue.slice(0, cursorPos) + target.dataset.id + areaValue.slice(cursorPos)
                    }
                    this.area.focus()
                    this.toggle()
                }
            })
            this.packagesEle = this.container.getElementsByClassName('OwO-packages')[0]
            for (let i = 0; i < this.packagesEle.children.length; i++) {
                ;(index => {
                    this.packagesEle.children[i].addEventListener('click', e => {
                        e.stopPropagation()
                        this.tab(index)
                    })
                })(i)
            }
            this.tab(0)
        }
 
        toggle() {
            if (this.container.classList.contains('OwO-open')) {
                this.container.classList.remove('OwO-open')
            } else {
                this.container.classList.add('OwO-open')
            }
        }
 
        tab(index) {
            const itemsShow = this.container.getElementsByClassName('OwO-items-show')[0]
            if (itemsShow) {
                itemsShow.classList.remove('OwO-items-show')
            }
            this.container.getElementsByClassName('OwO-items')[index].classList.add('OwO-items-show')
 
            const packageActive = this.container.getElementsByClassName('OwO-package-active')[0]
            if (packageActive) {
                packageActive.classList.remove('OwO-package-active')
            }
            this.packagesEle.getElementsByTagName('li')[index].classList.add('OwO-package-active')
        }
    }
 
    if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
        module.exports = OwO
    } else {
        window.OwO = OwO
    }
})()