package charity

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

	"go.fifitido.net/twitch/api/endpoint"
	"go.fifitido.net/twitch/api/types"
)

type GetCharityCampaignResponse struct {
	// A list that contains the charity campaign that the broadcaster is currently running.
	// The list is empty if the broadcaster is not running a charity campaign; the campaign information is not available after the campaign ends.
	Data []CharityCampaign `json:"data"`
}

type CharityCampaign struct {
	// An ID that identifies the charity campaign.
	ID string `json:"id"`

	// An ID that identifies the broadcaster that’s running the campaign.
	BroadcasterID string `json:"broadcaster_id"`

	// The broadcaster’s login name.
	BroadcasterLogin string `json:"broadcaster_login"`

	// The broadcaster’s display name.
	BroadcasterName string `json:"broadcaster_name"`

	// The charity’s name.
	CharityName string `json:"charity_name"`

	// A description of the charity.
	CharityDescription string `json:"charity_description"`

	// A URL to an image of the charity’s logo. The image’s type is PNG and its size is 100px X 100px.
	CharityLogo string `json:"charity_logo"`

	// A URL to the charity’s website.
	CharityWebsite string `json:"charity_website"`

	// The current amount of donations that the campaign has received.
	CurrentAmount types.CurrencyAmount `json:"current_amount"`

	// The campaign’s fundraising goal. This field is null if the broadcaster has not defined a fundraising goal.
	TargetAmount *types.CurrencyAmount `json:"target_amount"`
}

// Gets information about the charity campaign that a broadcaster is running.
// For example, the campaign’s fundraising goal and the current amount of donations.
//
// To receive events when progress is made towards the campaign’s goal or the broadcaster changes the fundraising goal,
// subscribe to the channel.charity_campaign.progress subscription type.
//
// Requires a user access token that includes the channel:read:charity scope.
func (c *Charity) GetCharityCampaign(ctx context.Context, broadcasterID string) (*GetCharityCampaignResponse, error) {
	v := url.Values{"broadcaster_id": {broadcasterID}}

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.Make(c.baseUrl, "charity/campaigns", v), 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 (%d)", res.StatusCode)
	}

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

	return &data, nil
}