package providers

import (
	"context"
	"encoding/json"
	"fmt"
	"regexp"
	"strconv"

	"github.com/golang-io/requests"
	"github.com/tkrajina/gpxgo/gpx"
)

func SuisseMobileCheckURL(url string) int {
	var id int

	re := regexp.MustCompile(`https?://(?:www\.)?schweizmobil\.ch/[^/]+/tour/(\d+)`)
	matches := re.FindStringSubmatch(url)

	if len(matches) > 1 {
		id, _ = strconv.Atoi(matches[1])
	}

	return id
}

type SuisseMobileGeometry struct {
	Segments [][][]float64 `json:"coordinates"`
}

type SuisseMobileProperties struct {
	Name string `json:"name"`
}

type SuisseMobileResponse struct {
	Properties SuisseMobileProperties `json:"properties"`
	Geometry   SuisseMobileGeometry   `json:"geometry"`
}

func SuisseMobileFetch(id int) (gpx.GPX, error) {
	var gpxFile gpx.GPX
	var gpxTrack gpx.GPXTrack

	sess := requests.New(
		requests.URL("https://schweizmobil.ch"),
	)
	resp, err := sess.DoRequest(
		context.Background(),
		requests.Path(fmt.Sprintf(
			"/api/6/tracks/%d", id,
		)),
	)
	if err != nil {
		return gpxFile, err
	}

	var response SuisseMobileResponse
	err = json.Unmarshal(resp.Content.Bytes(), &response)
	if err != nil {
		return gpxFile, err
	}

	gpxFile.Name = response.Properties.Name

	for _, segments := range response.Geometry.Segments {
		var gpxTrackSegment gpx.GPXTrackSegment

		for _, point := range segments {
			var gpxPoint gpx.GPXPoint

			gpxPoint.Longitude = point[0]
			gpxPoint.Latitude = point[1]
			gpxPoint.Elevation = *gpx.NewNullableFloat64(point[2])

			gpxTrackSegment.AppendPoint(&gpxPoint)
		}

		gpxTrack.AppendSegment(&gpxTrackSegment)
	}

	gpxFile.AppendTrack(&gpxTrack)

	return gpxFile, nil
}