package ads

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"time"
)

type GetAdScheduleResponse struct {
	// A list that contains information related to the channel’s ad schedule.
	Data []GetAdScheduleData `json:"data"`
}

type GetAdScheduleData struct {
	// The number of snoozes available for the broadcaster.
	SnoozeCount int `json:"snooze_count"`

	// The UTC timestamp when the broadcaster will gain an additional snooze, in RFC3339 format.
	SnoozeRefreshAt time.Time `json:"snooze_refresh_at"`

	// The UTC timestamp of the broadcaster’s next scheduled ad, in RFC3339 format. Empty if the channel has no ad scheduled or is not live.
	NextAdAt time.Time `json:"next_ad_at"`

	// The length in seconds of the scheduled upcoming ad break.
	Duration int `json:"duration"`

	// The UTC timestamp of the broadcaster’s last ad-break, in RFC3339 format. Empty if the channel has not run an ad or is not live.
	LastAdAt time.Time `json:"last_ad_at"`

	// The amount of pre-roll free time remaining for the channel in seconds. Returns 0 if they are currently not pre-roll free.
	PrerollFreeTime int `json:"preroll_free_time"`
}

// This endpoint returns ad schedule related information, including snooze, when the last ad was run, when the next ad is scheduled,
// and if the channel is currently in pre-roll free time. Note that a new ad cannot be run until 8 minutes after running a previous ad.
//
// Requires a user access token that includes the channel:read:ads scope.
// The user_id in the user access token must match the broadcaster_id.
func (e *Ads) GetAdSchedule(ctx context.Context, broadcasterID string) (*GetAdScheduleResponse, error) {
	endpoint := e.baseUrl.ResolveReference(&url.URL{Path: "channels/ads", RawQuery: "broadcaster_id=" + broadcasterID})

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil)
	if err != nil {
		return nil, err
	}

	res, err := e.client.Do(req)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	statusOK := res.StatusCode >= 200 && res.StatusCode < 300
	if !statusOK {
		return nil, fmt.Errorf("failed to get ad schedule (%d)", res.StatusCode)
	}

	var data GetAdScheduleResponse
	if err := json.NewDecoder(res.Body).Decode(&data); err != nil {
		return nil, err
	}

	return &data, nil
}