package manager

import (
	"context"
	"database/sql"
	"github.com/stashapp/stash/database"
	"github.com/stashapp/stash/ffmpeg"
	"github.com/stashapp/stash/logger"
	"github.com/stashapp/stash/models"
	"github.com/stashapp/stash/utils"
	"path/filepath"
	"strconv"
	"sync"
	"time"
)

type ScanTask struct {
	FilePath string
}

func (t *ScanTask) Start(wg *sync.WaitGroup) {
	if filepath.Ext(t.FilePath) == ".zip" {
		t.scanGallery()
	} else {
		t.scanScene()
	}

	wg.Done()
}

func (t *ScanTask) scanGallery() {
	qb := models.NewGalleryQueryBuilder()
	gallery, _ := qb.FindByPath(t.FilePath)
	if gallery != nil {
		// We already have this item in the database, keep going
		return
	}

	checksum, err := t.calculateChecksum()
	if err != nil {
		logger.Error(err.Error())
		return
	}

	ctx := context.TODO()
	tx := database.DB.MustBeginTx(ctx, nil)
	gallery, _ = qb.FindByChecksum(checksum, tx)
	if gallery != nil {
		logger.Infof("%s already exists.  Updating path...", t.FilePath)
		gallery.Path = t.FilePath
		_, err = qb.Update(*gallery, tx)
	} else {
		logger.Infof("%s doesn't exist.  Creating new item...", t.FilePath)
		currentTime := time.Now()
		newGallery := models.Gallery{
			Checksum: checksum,
			Path: t.FilePath,
			CreatedAt: models.SQLiteTimestamp{ Timestamp: currentTime },
			UpdatedAt: models.SQLiteTimestamp{ Timestamp: currentTime },
		}
		_, err = qb.Create(newGallery, tx)
	}

	if err != nil {
		logger.Error(err.Error())
		_ = tx.Rollback()
	} else if err := tx.Commit(); err != nil {
		logger.Error(err.Error())
	}
}

func (t *ScanTask) scanScene() {
	ffprobe := ffmpeg.NewFFProbe(instance.Paths.FixedPaths.FFProbe)
	ffprobeResult, err := ffprobe.ProbeVideo(t.FilePath)
	if err != nil {
		logger.Error(err.Error())
		return
	}

	qb := models.NewSceneQueryBuilder()
	scene, _ := qb.FindByPath(t.FilePath)
	if scene != nil {
		// We already have this item in the database, keep going
		return
	}

	checksum, err := t.calculateChecksum()
	if err != nil {
		logger.Error(err.Error())
		return
	}

	t.makeScreenshots(*ffprobeResult, checksum)

	scene, _ = qb.FindByChecksum(checksum)
	ctx := context.TODO()
	tx := database.DB.MustBeginTx(ctx, nil)
	if scene != nil {
		logger.Infof("%s already exists.  Updating path...", t.FilePath)
		scene.Path = t.FilePath
		_, err = qb.Update(*scene, tx)
	} else {
		logger.Infof("%s doesn't exist.  Creating new item...", t.FilePath)
		currentTime := time.Now()
		newScene := models.Scene{
			Checksum: checksum,
			Path: t.FilePath,
			Duration: sql.NullFloat64{Float64: ffprobeResult.Duration, Valid: true },
			VideoCodec: sql.NullString{ String: ffprobeResult.VideoCodec, Valid: true},
			AudioCodec: sql.NullString{ String: ffprobeResult.AudioCodec, Valid: true},
			Width: sql.NullInt64{ Int64: int64(ffprobeResult.Width), Valid: true },
			Height: sql.NullInt64{ Int64: int64(ffprobeResult.Height), Valid: true },
			Framerate: sql.NullFloat64{ Float64: ffprobeResult.FrameRate, Valid: true },
			Bitrate: sql.NullInt64{ Int64: ffprobeResult.Bitrate, Valid: true },
			Size: sql.NullString{ String: strconv.Itoa(int(ffprobeResult.Size)), Valid: true },
			CreatedAt: models.SQLiteTimestamp{ Timestamp: currentTime },
			UpdatedAt: models.SQLiteTimestamp{ Timestamp: currentTime },
		}
		_, err = qb.Create(newScene, tx)
	}

	if err != nil {
		logger.Error(err.Error())
		_ = tx.Rollback()
	} else if err := tx.Commit(); err != nil {
		logger.Error(err.Error())
	}
}

func (t *ScanTask) makeScreenshots(probeResult ffmpeg.FFProbeResult, checksum string) {
	thumbPath := instance.Paths.Scene.GetThumbnailScreenshotPath(checksum)
	normalPath := instance.Paths.Scene.GetScreenshotPath(checksum)

	thumbExists, _ := utils.FileExists(thumbPath)
	normalExists, _ := utils.FileExists(normalPath)
	if thumbExists && normalExists {
		logger.Debug("Screenshots already exist for this path... skipping")
		return
	}

	t.makeScreenshot(probeResult, thumbPath, 5, 320)
	t.makeScreenshot(probeResult, normalPath, 2, probeResult.Width)
}

func (t *ScanTask) makeScreenshot(probeResult ffmpeg.FFProbeResult, outputPath string, quality int, width int) {
	encoder := ffmpeg.NewEncoder(instance.Paths.FixedPaths.FFMPEG)
	options := ffmpeg.ScreenshotOptions{
		OutputPath: outputPath,
		Quality: quality,
		Time: float64(probeResult.Duration) * 0.2,
		Width: width,
	}
	encoder.Screenshot(probeResult, options)
}

func (t *ScanTask) calculateChecksum() (string, error) {
	logger.Infof("%s not found.  Calculating checksum...", t.FilePath)
	checksum, err := utils.MD5FromFilePath(t.FilePath)
	if err != nil {
		return "", err
	}
	logger.Debugf("Checksum calculated: %s", checksum)
	return checksum, nil
}