package diyanetapi

import (
	"context"
	"fmt"
	"time"

	"github.com/imroc/req/v3"

	"prayertimes/pkg/prayer"
)

type Provider struct {
	http *req.Client
}

func New(c *req.Client) Provider {
	return Provider{
		http: c.Clone().SetCommonBasicAuth("diyanet", "Q6Y3vYt5F3x2txPaaMF3uPgbK99EJhpM"),
	}
}

func (d Provider) GetByCoords(ctx context.Context, coords prayer.Coordinates) ([]prayer.Times, error) {
	res, err := d.http.NewRequest().
		SetContext(ctx).
		SetQueryParams(map[string]string{
			"latitude":  fmt.Sprintf("%f", coords.Latitude),
			"longitude": fmt.Sprintf("%f", coords.Longitude),
		}).
		Get("https://namazvakti.diyanet.gov.tr/api/NamazVakti/Aylik")
	if err != nil {
		return nil, fmt.Errorf("failed to get prayer times by coords: %w", err)
	}

	return d.parseResponse(res)
}

func (d Provider) Get(ctx context.Context, locationID string) ([]prayer.Times, error) {
	res, err := d.http.NewRequest().
		SetContext(ctx).
		SetQueryParam("ilceId", locationID).
		Get("https://namazvakti.diyanet.gov.tr/api/NamazVakti/Aylik")
	if err != nil {
		return nil, fmt.Errorf("failed to get prayer times by location id: %w", err)
	}

	return d.parseResponse(res)
}

func (d Provider) parseResponse(res *req.Response) ([]prayer.Times, error) {
	var response struct {
		Success      bool `json:"success"`
		ResultObject struct {
			Location struct {
				ID       int    `json:"konum_Id"`
				Timezone string `json:"timezone"`
			} `json:"konum"`
			PrayerTimes []struct {
				Date    time.Time `json:"miladi_tarih_uzun_Iso8601"`
				Fajr    time.Time `json:"imsak"`
				Sunrise time.Time `json:"gunes"`
				Dhuhr   time.Time `json:"ogle"`
				Asr     time.Time `json:"ikindi"`
				Maghrib time.Time `json:"aksam"`
				Isha    time.Time `json:"yatsi"`
			} `json:"namazVakti"`
		} `json:"resultObject"`
	}
	if err := res.Unmarshal(&response); err != nil {
		return nil, fmt.Errorf("failed to unmarshal as json: %w", err)
	}
	if !response.Success {
		return nil, fmt.Errorf("received error: %s", res.String())
	}

	if len(response.ResultObject.PrayerTimes) == 0 {
		return nil, nil
	}

	var times []prayer.Times
	const format = "15:04"
	today := time.Now().UTC().Truncate(time.Hour * 24)
	for _, pt := range response.ResultObject.PrayerTimes {
		then := prayer.Date(pt.Date).Time()
		if then.Before(today) {
			continue
		}

		times = append(times, prayer.Times{
			Date:    pt.Date.Format(time.DateOnly),
			Fajr:    pt.Fajr.Format(format),
			Sunrise: pt.Sunrise.Format(format),
			Dhuhr:   pt.Dhuhr.Format(format),
			Asr:     pt.Asr.Format(format),
			Maghrib: pt.Maghrib.Format(format),
			Isha:    pt.Isha.Format(format),
		})
	}
	return times, nil
}

func (d Provider) Name() string {
	return "diyanet"
}