//
//  rhimportd
//
//  The Radio Helsinki Rivendell Import Daemon
//
//
//  Copyright (C) 2015-2016 Christian Pointner <equinox@helsinki.at>
//
//  This file is part of rhimportd.
//
//  rhimportd 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
//  any later version.
//
//  rhimportd 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 rhimportd. If not, see <http://www.gnu.org/licenses/>.
//

package rhimport

import (
	"os"
)

func NormalizeFile(ctx *Context) (err error) {
	if ctx.LoudnessCorr == 0.0 {
		rhdl.Println("NormalizeFile: skipping normalization since the gain = 0.0dB")
		if ctx.ProgressCallBack != nil {
			if keep := ctx.ProgressCallBack(2, "normalizing", 1.0, 1.0, ctx.ProgressCallBackData); !keep {
				ctx.ProgressCallBack = nil
			}
		}
		return
	}

	rhl.Printf("NormalizeFile: using gain = %.2fdB", ctx.LoudnessCorr)
	ctx.NormalizationLevel = 0 // don't do double normalization

	var src *os.File
	if src, err = os.Open(ctx.SourceFile); err != nil {
		return
	}
	defer src.Close()

	size := int64(0)
	if info, err := src.Stat(); err != nil {
		return err
	} else {
		size = info.Size()
	}

	if ctx.ProgressCallBack != nil {
		if keep := ctx.ProgressCallBack(2, "normalizing", 0.0, float64(size), ctx.ProgressCallBackData); !keep {
			ctx.ProgressCallBack = nil
		}
	}

	// TODO: call ffmpeg

	if ctx.ProgressCallBack != nil {
		if keep := ctx.ProgressCallBack(2, "normalizing", float64(size), float64(size), ctx.ProgressCallBackData); !keep {
			ctx.ProgressCallBack = nil
		}
	}

	return
}