package chat

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

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

type SendChatAnnouncementParams struct {
	// The ID of the broadcaster that owns the chat room to send the announcement to.
	BroadcasterID string `url:"broadcaster_id"`

	// The ID of a user who has permission to moderate the broadcaster’s chat room, or the broadcaster’s ID if they’re sending the announcement.
	// This ID must match the user ID in the user access token.
	ModeratorID string `url:"moderator_id"`
}

type SendChatAnnouncementRequest struct {
	// The announcement to make in the broadcaster’s chat room.
	// Announcements are limited to a maximum of 500 characters; announcements longer than 500 characters are truncated.
	Message string `json:"message"`

	// The color used to highlight the announcement. Possible case-sensitive values are:
	//
	// If color is set to primary or is not set, the channel’s accent color is used to highlight the announcement
	// (see Profile Accent Color under profile settings, Channel and Videos, and Brand).
	Color *types.AccentColor `json:"color"`
}

// Sends an announcement to the broadcaster’s chat room.
//
// Requires a user access token that includes the moderator:manage:announcements scope.
func (c *Chat) SendChatAnnouncement(ctx context.Context, params *SendChatAnnouncementParams, body *SendChatAnnouncementRequest) error {
	v, _ := query.Values(params)
	endpoint := c.baseUrl.ResolveReference(&url.URL{Path: "chat/announcements", RawQuery: v.Encode()})

	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.MethodPost, endpoint.String(), r)
	if err != nil {
		return err
	}

	res, err := c.client.Do(req)
	if err != nil {
		return err
	}
	defer res.Body.Close()

	statusOK := res.StatusCode >= 200 && res.StatusCode < 300
	if !statusOK {
		return fmt.Errorf("failed to send chat announcement (%d)", res.StatusCode)
	}

	return nil
}