package channelpoints

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

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

type UpdateRedemptionStatusParams struct {
	// A list of IDs that identify the redemptions to update. To specify more than one ID, include this parameter for each redemption you want to update.
	// For example, id=1234&id=5678. You may specify a maximum of 50 IDs.
	IDs []string `url:"id"`

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

	// The ID that identifies the reward that’s been redeemed.
	RewardID string `url:"reward_id"`
}

type UpdateRedemptionStatusRequest struct {
	// The status to set the redemption to. Possible values are:
	//
	// CANCELED, FULFILLED
	//
	// Setting the status to CANCELED refunds the user’s channel points.
	Status RewardRedemptionStatus `json:"status"`
}

type UpdateRedemptionStatusResponse struct {
	// The list contains the single redemption that you updated.
	Data []CustomRewardRedemption `json:"data"`
}

// Updates a redemption’s status. You may update a redemption only if its status is UNFULFILLED.
// The app used to create the reward is the only app that may update the redemption.
//
// Requires a user access token that includes the channel:manage:redemptions scope.
func (c *ChannelPoints) UpdateRedemptionStatus(ctx context.Context, params *UpdateRedemptionStatusParams, body *UpdateRedemptionStatusRequest) (*UpdateRedemptionStatusResponse, error) {
	v, _ := query.Values(body)

	r, w := io.Pipe()

	go func() {
		if err := json.NewEncoder(w).Encode(body); err != nil {
			w.CloseWithError(err)
		} else {
			w.Close()
		}
	}()

	req, err := http.NewRequestWithContext(ctx, http.MethodPatch, endpoint.Make(c.baseUrl, "channel_points/custom_rewards/redemptions", v), r)
	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 update redemption status (%d)", res.StatusCode)
	}

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

	return &data, nil
}