package query

import (
	"fmt"
	"strings"
	"time"

	"github.com/jinzhu/gorm"
	"github.com/photoprism/photoprism/internal/entity"
	"github.com/photoprism/photoprism/internal/form"
	"github.com/photoprism/photoprism/pkg/capture"
	"github.com/photoprism/photoprism/pkg/pluscode"
	"github.com/photoprism/photoprism/pkg/s2"
	"github.com/photoprism/photoprism/pkg/txt"
)

// Geo searches for photos based on a Form and returns GeoResults ([]GeoResult).
func Geo(f form.GeoSearch) (results GeoResults, err error) {
	start := time.Now()

	if err := f.ParseQueryString(); err != nil {
		return results, err
	}

	defer log.Debug(capture.Time(time.Now(), fmt.Sprintf("geo: search %s", form.Serialize(f, true))))

	s := UnscopedDb()

	s = s.Table("photos").
		Select(`photos.id, photos.photo_uid, photos.photo_type, photos.photo_lat, photos.photo_lng, 
		photos.photo_title, photos.photo_description, photos.photo_favorite, photos.taken_at, files.file_hash, files.file_width, 
		files.file_height`).
		Joins(`JOIN files ON files.photo_id = photos.id AND 
		files.file_missing = 0 AND files.file_primary AND files.deleted_at IS NULL`).
		Where("photos.deleted_at IS NULL").
		Where("photos.photo_lat <> 0").
		Group("photos.id, files.id")

	f.Query = txt.Clip(f.Query, txt.ClipKeyword)

	if f.Query != "" {
		// Filter by label, label category and keywords.
		var categories []entity.Category
		var labels []entity.Label
		var labelIds []uint

		if len(f.Query) < 2 {
			return results, fmt.Errorf("query too short")
		}

		if err := Db().Where(AnySlug("custom_slug", f.Query)).Find(&labels).Error; len(labels) == 0 || err != nil {
			log.Infof("search: label %s not found, using fuzzy search", txt.Quote(f.Query))

			if likeAny := LikeAny("k.keyword", f.Query); likeAny != "" {
				s = s.Where("photos.id IN (SELECT pk.photo_id FROM keywords k JOIN photos_keywords pk ON k.id = pk.keyword_id WHERE (?))", gorm.Expr(likeAny))
			}
		} else {
			for _, l := range labels {
				labelIds = append(labelIds, l.ID)

				Db().Where("category_id = ?", l.ID).Find(&categories)

				log.Infof("search: label %s includes %d categories", txt.Quote(l.LabelName), len(categories))

				for _, category := range categories {
					labelIds = append(labelIds, category.LabelID)
				}
			}

			if likeAny := LikeAny("k.keyword", f.Query); likeAny != "" {
				s = s.Where("photos.id IN (SELECT pk.photo_id FROM keywords k JOIN photos_keywords pk ON k.id = pk.keyword_id WHERE (?)) OR "+
					"photos.id IN (SELECT pl.photo_id FROM photos_labels pl WHERE pl.uncertainty < 100 AND pl.label_id IN (?))", gorm.Expr(likeAny), labelIds)
			} else {
				s = s.Where("photos.id IN (SELECT pl.photo_id FROM photos_labels pl WHERE pl.uncertainty < 100 AND pl.label_id IN (?))", labelIds)
			}
		}
	}

	if f.Album != "" {
		s = s.Joins("JOIN photos_albums ON photos_albums.photo_uid = photos.photo_uid").Where("photos_albums.album_uid IN (?)", strings.Split(f.Album, ","))
	}

	if f.Camera > 0 {
		s = s.Where("photos.camera_id = ?", f.Camera)
	}

	if f.Lens > 0 {
		s = s.Where("photos.lens_id = ?", f.Lens)
	}

	if (f.Year > 0 && f.Year <= txt.YearMax) || f.Year == entity.YearUnknown {
		s = s.Where("photos.photo_year = ?", f.Year)
	}

	if (f.Month >= txt.MonthMin && f.Month <= txt.MonthMax) || f.Month == entity.MonthUnknown {
		s = s.Where("photos.photo_month = ?", f.Month)
	}

	if f.Color != "" {
		s = s.Where("files.file_main_color IN (?)", strings.Split(strings.ToLower(f.Color), ","))
	}

	if f.Favorite {
		s = s.Where("photos.photo_favorite = 1")
	}

	if f.Country != "" {
		s = s.Where("photos.photo_country IN (?)", strings.Split(strings.ToLower(f.Country), ","))
	}

	// Filter by media type.
	if f.Type != "" {
		s = s.Where("photos.photo_type IN (?)", strings.Split(strings.ToLower(f.Type), ","))
	}

	if f.Video {
		s = s.Where("photos.photo_type = 'video'")
	} else if f.Photo {
		s = s.Where("photos.photo_type IN ('image','raw','live')")
	}

	if f.Path != "" {
		p := f.Path

		if strings.HasPrefix(p, "/") {
			p = p[1:]
		}

		if strings.HasSuffix(p, "/") {
			s = s.Where("photos.photo_path = ?", p[:len(p)-1])
		} else if strings.Contains(p, ",") {
			s = s.Where("photos.photo_path IN (?)", strings.Split(p, ","))
		} else {
			s = s.Where("photos.photo_path LIKE ?", strings.ReplaceAll(p, "*", "%"))
		}
	}

	if f.Name != "" {
		s = s.Where("photos.photo_name LIKE ?", strings.ReplaceAll(f.Name, "*", "%"))
	}

	if f.Review {
		s = s.Where("photos.photo_quality < 3")
	} else if f.Quality != 0 {
		s = s.Where("photos.photo_quality >= ?", f.Quality)
	}

	if f.Favorite {
		s = s.Where("photos.photo_favorite = 1")
	}

	if f.S2 != "" {
		s2Min, s2Max := s2.Range(f.S2, 7)
		s = s.Where("photos.location_id BETWEEN ? AND ?", s2Min, s2Max)
	} else if f.Olc != "" {
		s2Min, s2Max := s2.Range(pluscode.S2(f.Olc), 7)
		s = s.Where("photos.location_id BETWEEN ? AND ?", s2Min, s2Max)
	} else {
		// Inaccurate distance search, but probably 'good enough' for now
		if f.Lat > 0 {
			latMin := f.Lat - SearchRadius*float32(f.Dist)
			latMax := f.Lat + SearchRadius*float32(f.Dist)
			s = s.Where("photos.photo_lat BETWEEN ? AND ?", latMin, latMax)
		}

		if f.Lng > 0 {
			lngMin := f.Lng - SearchRadius*float32(f.Dist)
			lngMax := f.Lng + SearchRadius*float32(f.Dist)
			s = s.Where("photos.photo_lng BETWEEN ? AND ?", lngMin, lngMax)
		}
	}

	if !f.Before.IsZero() {
		s = s.Where("photos.taken_at <= ?", f.Before.Format("2006-01-02"))
	}

	if !f.After.IsZero() {
		s = s.Where("photos.taken_at >= ?", f.After.Format("2006-01-02"))
	}

	s = s.Order("taken_at, photos.photo_uid")

	if result := s.Scan(&results); result.Error != nil {
		return results, result.Error
	}

	log.Infof("geo: found %d photos for %s [%s]", len(results), f.SerializeAll(), time.Since(start))

	return results, nil
}