package extensions

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

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

type GetExtensionLiveChannelsParams struct {
	// The ID of the extension to get. Returns the list of broadcasters that are live and that have installed or activated this extension.
	ExtensionID string `url:"extension_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 20.
	First *int `url:"first,omitempty"`

	// The cursor used to get the next page of results. The pagination field 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 GetExtensionLiveChannelsResponse struct {
	// The list of broadcasters that are streaming live and that have installed or activated the extension.
	Data []ExtensionLiveChannel `json:"data"`

	// The cursor used to get the next page of results. The pagination field in the response contains the cursor’s value.
	// Read More: https://dev.twitch.tv/docs/api/guide#pagination
	Pagination types.Pagination `json:"pagination"`
}

type ExtensionLiveChannel struct {
	// The ID of the broadcaster that is streaming live and has installed or activated the extension.
	BroadcasterID string `json:"broadcaster_id"`
	// The broadcaster’s display name.
	BroadcasterName string `json:"broadcaster_name"`
	// The name of the category or game being streamed.
	GameName string `json:"game_name"`
	// The ID of the category or game being streamed.
	GameID string `json:"game_id"`
	// The title of the broadcaster’s stream. May be an empty string if not specified.
	Title string `json:"title"`
}

// Gets a list of broadcasters that are streaming live and have installed or activated the extension.
//
// It may take a few minutes for the list to include or remove broadcasters that have recently gone live or stopped broadcasting.
//
// Requires an app access token or user access token.
func (c *Extensions) GetExtensionLiveChannels(ctx context.Context, params *GetExtensionLiveChannelsParams) (*GetExtensionLiveChannelsResponse, error) {
	v, _ := query.Values(params)
	endpoint := c.baseUrl.ResolveReference(&url.URL{Path: "extensions/live", RawQuery: v.Encode()})

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

	res, err := c.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 extension live channels (%d)", res.StatusCode)
	}

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

	return &response, nil
}