package hypetrain

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

	"github.com/google/go-querystring/query"
	"go.fifitido.net/twitch/api/types"
)

type GetHypeTrainEventsParams struct {

	// The ID of the broadcaster that’s running the Hype Train. This ID must match the User ID in the user access token.
	BroadcasterID string `url:"broadcaster_id"`

	// The maximum number of items to return per page in the response.
	// The minimum page size is 1 item per page and the maximum is 100 items per page.
	// The default is 1.
	First *int `url:"first,omitempty"`

	// The cursor used to get the next page of results. The Pagination object in the response contains the cursor’s value.
	// Read More: https://dev.twitch.tv/docs/api/guide#pagination
	After *types.Cursor `url:"after,omitempty"`
}

type Event struct {
	// An ID that identifies this event.
	ID string `json:"id"`

	// The type of event. The string is in the form, hypetrain.{event_name}.
	// The request returns only progress event types (i.e., hypetrain.progression).
	EventType string `json:"event_type"`

	// The UTC date and time (in RFC3339 format) that the event occurred.
	EventTimestamp time.Time `json:"event_timestamp"`

	// The version number of the definition of the event’s data.
	// For example, the value is 1 if the data in event_data uses the first definition of the event’s data.
	Version string `json:"version"`

	// The event’s data.
	EventData EventData `json:"event_data"`
}

type EventData struct {
	// The ID of the broadcaster that’s running the Hype Train.
	BroadcasterID string `json:"broadcaster_id"`

	// The UTC date and time (in RFC3339 format) that another Hype Train can start.
	CooldownEndTime time.Time `json:"cooldown_end_time"`

	// The UTC date and time (in RFC3339 format) that the Hype Train ends.
	ExpiresAt time.Time `json:"expires_at"`

	// The value needed to reach the next level.
	Goal int `json:"goal"`

	// An ID that identifies this Hype Train.
	ID string `json:"id"`

	// The most recent contribution towards the Hype Train’s goal.
	LastContribution Contribution `json:"last_contribution"`

	// The highest level that the Hype Train reached (the levels are 1 through 5).
	Level int `json:"level"`

	// The UTC date and time (in RFC3339 format) that this Hype Train started.
	StartedAt time.Time `json:"started_at"`

	// The top contributors for each contribution type.
	// For example, the top contributor using BITS (by aggregate) and the top contributor using SUBS (by count).
	TopContributions []Contribution `json:"top_contributions"`

	// The total amount raised.
	Total int `json:"total"`
}

type Contribution struct {
	// The total amount contributed.
	//
	// If type is BITS, total represents the amount of Bits used.
	//
	// If type is SUBS, total is 500, 1000, or 2500 to represent tier 1, 2, or 3 subscriptions, respectively.
	Total int `json:"total"`

	// The contribution method used.
	//
	// Possible values are:
	//
	// BITS — Cheering with Bits.
	//
	// SUBS — Subscription activity like subscribing or gifting subscriptions.
	//
	// OTHER — Covers other contribution methods not listed.
	Type string `json:"type"`

	// The ID of the user that made the contribution.
	User string `json:"user"`
}

type GetHypeTrainEventsResponse struct {
	// The list of Hype Train events.
	// The list is empty if the broadcaster hasn’t run a Hype Train within the last 5 days.
	Data []Event `json:"data"`

	// Contains the information used to page through the list of results. The object is empty if there are no more pages left to page through.
	// Read More: https://dev.twitch.tv/docs/api/guide#pagination
	Pagination types.Pagination `json:"pagination"`
}

// Gets information about the broadcaster’s current or most recent Hype Train event.
//
// Instead of polling for events, consider subscribing to Hype Train events (Begin, Progress, End).
//
// Requires a user access token that includes the channel:read:hype_train scope.
func (h *Hypetrain) GetHypeTrainEvents(ctx context.Context, params *GetHypeTrainEventsParams) (*GetHypeTrainEventsResponse, error) {
	v, _ := query.Values(params)
	endpoint := h.baseUrl.ResolveReference(&url.URL{Path: "hypetrain/events", RawQuery: v.Encode()})

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

	res, err := h.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 Hype Train events (%d)", res.StatusCode)
	}

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

	return &data, nil
}