package charity

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

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

type GetCharityCampaignDonationsParams struct {
	// The ID of the broadcaster that’s currently running a charity campaign. This ID must match the user ID in the access token.
	BroadcasterID string `json:"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. The default is 20.
	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 GetCharityCampaignDonationsResponse struct {
	// A list that contains the donations that users have made to the broadcaster’s charity campaign.
	// The list is empty if the broadcaster is not currently running a charity campaign.
	// The donation information is not available after the campaign ends.
	Data []CharityCampaignDonation `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"`
}

type CharityCampaignDonation struct {
	// An ID that identifies the donation. The ID is unique across campaigns
	ID string `json:"id"`

	// An ID that identifies the charity campaign that the donation applies to.
	CampaignID string `json:"campaign_id"`

	// An ID that identifies a user that donated money to the campaign.
	UserID string `json:"user_id"`

	// The user’s login name.
	UserLogin string `json:"user_login"`

	// The user’s display name.
	UserName string `json:"user_name"`

	// An object that contains the amount of money that the user donated.
	Amount types.CurrencyAmount `json:"amount"`
}

// Gets the list of donations that users have made to the broadcaster’s active charity campaign.
//
// To receive events as donations occur, subscribe to the channel.charity_campaign.donate subscription type.
//
// Requires a user access token that includes the channel:read:charity scope.
func (c *Charity) GetCharityCampaignDonations(ctx context.Context, params *GetCharityCampaignDonationsParams) (*GetCharityCampaignDonationsResponse, error) {
	v, _ := query.Values(params)
	endpoint := c.baseUrl.ResolveReference(&url.URL{Path: "charity/campaigns/donations", 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 charity campaign donations (%d)", res.StatusCode)
	}

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

	return &respBody, nil
}