package api

import (
	"net/http"

	"github.com/photoprism/photoprism/internal/config"
	"github.com/photoprism/photoprism/internal/query"
	"github.com/photoprism/photoprism/pkg/txt"

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

	"github.com/paulmach/go.geojson"
)

// GET /api/v1/geo
func GetGeo(router *gin.RouterGroup, conf *config.Config) {
	router.GET("/geo", func(c *gin.Context) {
		var f form.GeoSearch

		q := query.New(conf.OriginalsPath(), conf.Db())
		err := c.MustBindWith(&f, binding.Form)

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

		photos, err := q.Geo(f)

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

		fc := geojson.NewFeatureCollection()

		bbox := make([]float64, 4)

		bboxMin := func (pos int, val float64) {
			if bbox[pos] == 0.0 || bbox[pos] > val {
				bbox[pos] = val
			}
		}

		bboxMax := func (pos int, val float64) {
			if bbox[pos] == 0.0 || bbox[pos] < val {
				bbox[pos] = val
			}
		}

		for _, p := range photos {
			bboxMin(0, p.PhotoLng)
			bboxMin(1, p.PhotoLat)
			bboxMax(2, p.PhotoLng)
			bboxMax(3, p.PhotoLat)

			feat := geojson.NewPointFeature([]float64{p.PhotoLng, p.PhotoLat})
			feat.Properties = gin.H{
				"PhotoUUID":  p.PhotoUUID,
				"PhotoTitle": p.PhotoTitle,
				"FileHash":   p.FileHash,
				"FileWidth":  p.FileWidth,
				"FileHeight": p.FileHeight,
				"TakenAt":    p.TakenAt,
			}
			fc.AddFeature(feat)
		}

		fc.BoundingBox = bbox

		resp, err := fc.MarshalJSON()

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

		c.Data(http.StatusOK, "application/json", resp)
	})
}