package api

import (
	"fmt"
	"net/http"
	"strconv"

	"github.com/photoprism/photoprism/internal/config"
	"github.com/photoprism/photoprism/internal/event"
	"github.com/photoprism/photoprism/internal/util"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/photoprism/photoprism/internal/form"
	"github.com/photoprism/photoprism/internal/photoprism"
)

// GET /api/v1/photos
//
// Query:
//   q:         string Query string
//   label:     string Label
//   cat:       string Category
//   country:   string Country code
//   camera:    int    UpdateCamera ID
//   order:     string Sort order
//   count:     int    Max result count (required)
//   offset:    int    Result offset
//   before:    date   Find photos taken before (format: "2006-01-02")
//   after:     date   Find photos taken after (format: "2006-01-02")
//   favorites: bool   Find favorites only
func GetPhotos(router *gin.RouterGroup, conf *config.Config) {
	router.GET("/photos", func(c *gin.Context) {
		var f form.PhotoSearch

		search := photoprism.NewSearch(conf.OriginalsPath(), conf.Db())
		err := c.MustBindWith(&f, binding.Form)

		if err != nil {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": util.UcFirst(err.Error())})
			return
		}

		result, err := search.Photos(f)

		if err != nil {
			c.AbortWithStatusJSON(400, gin.H{"error": util.UcFirst(err.Error())})
			return
		}

		c.Header("X-Result-Count", strconv.Itoa(f.Count))
		c.Header("X-Result-Offset", strconv.Itoa(f.Offset))

		c.JSON(http.StatusOK, result)
	})
}

// GET /api/v1/photos/:uuid/download
//
// Parameters:
//   uuid: string PhotoUUID as returned by the API
func GetPhotoDownload(router *gin.RouterGroup, conf *config.Config) {
	router.GET("/photos/:uuid/download", func(c *gin.Context) {
		search := photoprism.NewSearch(conf.OriginalsPath(), conf.Db())
		file, err := search.FindFileByPhotoUUID(c.Param("uuid"))

		if err != nil {
			c.AbortWithStatusJSON(404, gin.H{"error": err.Error()})
			return
		}

		fileName := fmt.Sprintf("%s/%s", conf.OriginalsPath(), file.FileName)

		if !util.Exists(fileName) {
			log.Errorf("could not find original: %s", c.Param("uuid"))
			c.Data(404, "image/svg+xml", photoIconSvg)

			// Set missing flag so that the file doesn't show up in search results anymore
			file.FileMissing = true
			conf.Db().Save(&file)
			return
		}

		downloadFileName := file.DownloadFileName()

		c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=%s", downloadFileName))

		c.File(fileName)
	})
}

// POST /api/v1/photos/:uuid/like
//
// Parameters:
//   uuid: string PhotoUUID as returned by the API
func LikePhoto(router *gin.RouterGroup, conf *config.Config) {
	router.POST("/photos/:uuid/like", func(c *gin.Context) {
		if Unauthorized(c, conf) {
			c.AbortWithStatusJSON(http.StatusUnauthorized, ErrUnauthorized)
			return
		}

		search := photoprism.NewSearch(conf.OriginalsPath(), conf.Db())
		m, err := search.FindPhotoByUUID(c.Param("uuid"))

		if err != nil {
			c.AbortWithStatusJSON(404, gin.H{"error": util.UcFirst(err.Error())})
			return
		}

		m.PhotoFavorite = true
		conf.Db().Save(&m)

		event.Publish("count.favorites", event.Data{
			"count": 1,
		})

		c.JSON(http.StatusOK, gin.H{"photo": m})
	})
}

// DELETE /api/v1/photos/:uuid/like
//
// Parameters:
//   uuid: string PhotoUUID as returned by the API
func DislikePhoto(router *gin.RouterGroup, conf *config.Config) {
	router.DELETE("/photos/:uuid/like", func(c *gin.Context) {
		if Unauthorized(c, conf) {
			c.AbortWithStatusJSON(http.StatusUnauthorized, ErrUnauthorized)
			return
		}

		search := photoprism.NewSearch(conf.OriginalsPath(), conf.Db())
		m, err := search.FindPhotoByUUID(c.Param("uuid"))

		if err != nil {
			c.AbortWithStatusJSON(404, gin.H{"error": util.UcFirst(err.Error())})
			return
		}

		m.PhotoFavorite = false
		conf.Db().Save(&m)

		event.Publish("count.favorites", event.Data{
			"count": -1,
		})

		c.JSON(http.StatusOK, gin.H{"photo": m})
	})
}