class DataMerger {
    constructor({
        defaultValue = null,
        clearAllEmptyColumns = true,
        clearAllEmptyRows = true,
        // autoSort = false,
    } = {}) {
        this.x = []
        this.o = {}
        this.defaultValue = defaultValue

        this.clearAllEmptyColumns = clearAllEmptyColumns
        this.clearAllEmptyRows = clearAllEmptyRows
    }

    clear() {
        this.x = []
        this.o = {}
    }

    clearRow(rowName) {
        delete this.o[rowName]
    }

    clearColumnByName(name) {
        const i =this.x.indexOf(name)
        if (i === -1) {
            return
        }

        this.clearColumnByIndex(i)
    }

    clearColumnByIndex(i) {
        delete this.x[i]
        this.x = this.x.flat()
        for (let key of Object.keys(this.o)) {
            delete this.o[key][i]
            this.o[key] = this.o[key].flat()
        }
    }

    merge(columnNames, data, rowName = 'default') {
        if (!this.o[rowName]) {
            let newList = []
            for (let i in this.x) {
                newList.push(this.defaultValue)
            }
            this.o[rowName] = newList
        }

        for (let i in columnNames) {
            let index = this.x.indexOf(columnNames[i])

            if (index === -1) {
                this.x.push(columnNames[i])
                for (let row of Object.values(this.o)) {
                    row.push(this.defaultValue)
                }

                index = this.x.length - 1
            }

            this.o[rowName][index] = data[i]
        }

        if (this.clearAllEmptyRows) {
            for (let key of Object.keys(this.o)) {
                let allowToClear = true

                for (let item of this.o[key]) {
                    if (item !== this.defaultValue) {
                        allowToClear = false
                        break
                    }
                }

                if (allowToClear) {
                    this.clearRow(key)
                }
            }
        }

        if (this.clearAllEmptyColumns) {
            for (let i = 0; i < this.x.length; i++) {
                let allowToClear = true
                for (let item of Object.values(this.o)) {
                    if (item[i] !== this.defaultValue) {
                        allowToClear = false
                        break
                    }
                }

                if (allowToClear) {
                    this.clearColumnByIndex(i)
                    i--
                }
            }
        }
    }

    getColumnNames() {
        return this.x
    }

    getData() {
        return this.o
    }
}