/*
Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>

This file is part of Scotty.

Scotty is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.

Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
Scotty. If not, see <https://www.gnu.org/licenses/>.
*/

package cli

import (
	"sync"
	"time"

	"github.com/fatih/color"
	"github.com/vbauerster/mpb/v8"
	"github.com/vbauerster/mpb/v8/decor"
	"go.uploadedlobster.com/scotty/internal/i18n"
	"go.uploadedlobster.com/scotty/internal/models"
)

func progressBar(wg *sync.WaitGroup, exportProgress chan models.Progress, importProgress chan models.Progress) *mpb.Progress {
	p := mpb.New(
		mpb.WithWaitGroup(wg),
		mpb.WithOutput(color.Output),
		// mpb.WithWidth(64),
		mpb.WithAutoRefresh(),
	)

	exportBar := setupProgressBar(p, i18n.Tr("exporting"))
	importBar := setupProgressBar(p, i18n.Tr("importing"))
	go updateProgressBar(exportBar, wg, exportProgress)
	go updateProgressBar(importBar, wg, importProgress)

	return p
}

func setupProgressBar(p *mpb.Progress, name string) *mpb.Bar {
	green := color.New(color.FgGreen).SprintFunc()
	return p.New(0,
		mpb.BarStyle(),
		mpb.PrependDecorators(
			decor.Name(" "),
			decor.OnComplete(
				decor.Spinner(nil, decor.WC{W: 2, C: decor.DidentRight}),
				green("✓ "),
			),
			decor.Name(name, decor.WCSyncWidthR),
		),
		mpb.AppendDecorators(
			decor.OnComplete(
				decor.EwmaETA(decor.ET_STYLE_GO, 0, decor.WC{C: decor.DSyncWidth}),
				i18n.Tr("done"),
			),
			// decor.OnComplete(decor.Percentage(decor.WC{W: 5, C: decor.DSyncWidthR}), "done"),
			decor.Name(" "),
		),
	)
}

func updateProgressBar(bar *mpb.Bar, wg *sync.WaitGroup, progressChan chan models.Progress) {
	wg.Add(1)
	defer wg.Done()
	lastIterTime := time.Now()
	for progress := range progressChan {
		oldIterTime := lastIterTime
		lastIterTime = time.Now()
		bar.EwmaSetCurrent(progress.Elapsed, lastIterTime.Sub(oldIterTime))
		bar.SetTotal(progress.Total, progress.Completed)
	}
}