/*
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 backends

import "go.uploadedlobster.com/scotty/internal/models"

func ProcessListensImports(importer models.ListensImport, results chan models.ListensResult, out chan models.ImportResult, progress chan models.Progress) {
	defer close(out)
	defer close(progress)
	result := models.ImportResult{}

	err := importer.StartImport()
	if err != nil {
		handleError(result, err, out, progress)
		return
	}

	for exportResult := range results {
		if exportResult.Error != nil {
			handleError(result, exportResult.Error, out, progress)
			return
		}

		if exportResult.Total > 0 {
			result.TotalCount = exportResult.Total
		} else {
			result.TotalCount += len(exportResult.Items)
		}
		importResult, err := importer.ImportListens(exportResult, result, progress)
		if err != nil {
			handleError(importResult, err, out, progress)
			return
		}

		result.Update(importResult)
		progress <- models.Progress{}.FromImportResult(result)
	}

	err = importer.FinishImport()
	if err != nil {
		handleError(result, err, out, progress)
		return
	}

	progress <- models.Progress{}.FromImportResult(result).Complete()
	out <- result
}

func ProcessLovesImports(importer models.LovesImport, results chan models.LovesResult, out chan models.ImportResult, progress chan models.Progress) {
	defer close(out)
	defer close(progress)
	result := models.ImportResult{}

	err := importer.StartImport()
	if err != nil {
		handleError(result, err, out, progress)
		return
	}

	for exportResult := range results {
		if exportResult.Error != nil {
			handleError(result, exportResult.Error, out, progress)
			return
		}

		if exportResult.Total > 0 {
			result.TotalCount = exportResult.Total
		} else {
			result.TotalCount += len(exportResult.Items)
		}
		importResult, err := importer.ImportLoves(exportResult, result, progress)
		if err != nil {
			handleError(importResult, err, out, progress)
			return
		}

		result.Update(importResult)
		progress <- models.Progress{}.FromImportResult(result)
	}

	err = importer.FinishImport()
	if err != nil {
		handleError(result, err, out, progress)
		return
	}

	progress <- models.Progress{}.FromImportResult(result).Complete()
	out <- result
}

func handleError(result models.ImportResult, err error, out chan models.ImportResult, progress chan models.Progress) {
	result.Error = err
	progress <- models.Progress{}.FromImportResult(result).Complete()
	out <- result
}