function hasCheckbox(id) {
    let found = false
    let todo = false
    this.update(id, function (item, prev, next) {
        let res = item.text.match(/^#\[\[(TODO|DONE)\]\]/)
        if (res) {
            found = true
            todo = res[1] === 'TODO'
        }
        return item
    });
    return [found, todo]
}

function addCheckbox(id) {
    this.update(id, function (item, prev, next) {
        if (item.text.match(/^#\[\[TODO\]\]/)) {
            return item
        } else if (item.text.match(/^#\[\[|DONE\]\]/)) {
            item.text = item.text.replace(/^#\[\[DONE\]\]/, '#[[TODO]]')
        } else {
            item.text = '#[[TODO]] ' + item.text
        }
        return item
    });
}

function removeCheckbox(id) {
    this.update(id, function (item, prev, next) {
        if (item.text.match(/^#\[\[(TODO|DONE)\]\]/)) {
            item.text = item.text.replace(/#\[\[(TODO|DONE)\]\]\s*/, '')
        }
        return item
    });
}

function markDone(id) {
    this.update(id, function (item, prev, next) {
        if (item.text.match(/^#\[\[(TODO)\]\]/)) {
            item.text = item.text.replace(/#\[\[(TODO)\]\]\s*/, '#[[DONE]]')
        }
        return item
    });
}

function markTodo(id) {
    this.update(id, function (item, prev, next) {
        if (item.text.match(/^#\[\[(DONE)\]\]/)) {
            item.text = item.text.replace(/#\[\[(DONE)\]\]\s*/, '#[[TODO]]')
        }
        return item
    });
}

function sort(id, property, direction) {
    let children = this.getChildren(id)
    if (property === 'todo') {
        children = _.orderBy(children, item => {
            const res = item.text.match(/^#\[\[(TODO|DONE)/)
            if (!res) return "C";
            if (res[1] === 'TODO') return "A";
            if (res[1] === 'DONE') return "B";
            return "D";
        }, direction)
    } else if (property === 'text') {
        children = _.orderBy(children, item => {
            return item.text.replace(/^#\[\[(TODO|DONE)]]\s*/, '')
        }, direction)
    } else {
        children = _.orderBy(children, property, direction)
    }
    this.replaceChildren(id, children)
}

function removeCompleted(id) {
    let children = this.getChildren(id)
    let newChildren = _.filter(children, item => {
        let res = item.text.match(/^#\[\[(TODO|DONE)\]\]/)
        let found = false, todo = false
        if (res) {
            found = true
            todo = res[1] === 'TODO'
        }
        return !found || todo
    })
    this.replaceChildren(id, newChildren)
}

export default {
    hasCheckbox,
    addCheckbox,
    removeCheckbox,
    markTodo,
    markDone,
    sort,
    removeCompleted
}