package progressbar

import (
	"fmt"
	"velvettear/badger/internal/config"
	"velvettear/badger/internal/tools"
)

// exported function(s)
func New(start, total int64) Progressbar {
	return NewGraph(start, total, "")
}

func NewGraph(start, total int64, graph string) Progressbar {
	if len(graph) == 0 {
		graph = "#"
	}
	progressbar := Progressbar{
		current: start,
		total:   total,
		graph:   graph,
	}
	progressbar.setPercentage()
	progressbar.setRate()
	return progressbar
}

func (progressbar *Progressbar) Step() {
	progressbar.SetCurrent(progressbar.current + 1)
}

func (progressbar *Progressbar) SetCurrent(current int64) {
	if config.Debug() {
		return
	}
	progressbar.current = current
	last := progressbar.percentage
	progressbar.setPercentage()
	if progressbar.percentage != last {
		var index int64 = 0
		for ; index < progressbar.percentage-last; index++ {
			progressbar.rate += progressbar.graph
		}
		fmt.Printf("\r"+tools.GetFormattedDate()+"[info] > [%-50s] %3d%% | %d/%d", progressbar.rate, progressbar.percentage*2, progressbar.current, progressbar.total)
	}
}

func (progressbar *Progressbar) Finish() {
	if config.Debug() {
		return
	}
	fmt.Println()
}

// unexported function(s)
func getPercentage(current int64, total int64) int64 {
	return int64((float32(current) / float32(total)) * 50)
}

func (progressbar *Progressbar) setPercentage() {
	progressbar.percentage = getPercentage(progressbar.current, progressbar.total)
}

func (progressbar *Progressbar) setRate() {
	for index := 0; index < int(progressbar.percentage); index += 2 {
		progressbar.rate += progressbar.graph
	}
}

// struct(s)
type Progressbar struct {
	percentage int64
	current    int64
	total      int64
	rate       string
	graph      string
}