package channels

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

	"go.fifitido.net/twitch/api/ccls"
)

type ModifyChannelInformationRequest struct {
	// The ID of the game that the user plays. The game is not updated if the ID isn’t a game ID that Twitch recognizes.
	// To unset this field, use “0” or “” (an empty string).
	GameID *string `json:"game_id,omitempty"`

	// The user’s preferred language. Set the value to an ISO 639-1 two-letter language code (for example, en for English).
	// Set to “other” if the user’s preferred language is not a Twitch supported language.
	// The language isn’t updated if the language code isn’t a Twitch supported language.
	Language *string `json:"language,omitempty"`

	// The title of the user’s stream. You may not set this field to an empty string.
	Title *string `json:"title,omitempty"`

	// The number of seconds you want your broadcast buffered before streaming it live. The delay helps ensure fairness during competitive play.
	// Only users with Partner status may set this field. The maximum delay is 900 seconds (15 minutes).
	Delay *int `json:"delay,omitempty"`

	// A list of channel-defined tags to apply to the channel. To remove all tags from the channel, set tags to an empty array.
	// Tags help identify the content that the channel streams. Learn More: https://help.twitch.tv/s/article/guide-to-tags
	//
	// A channel may specify a maximum of 10 tags.
	// Each tag is limited to a maximum of 25 characters and may not be an empty string or contain spaces or special characters.
	// Tags are case insensitive. For readability, consider using camelCasing or PascalCasing.
	Tags *[]string `json:"tags,omitempty"`

	// List of labels that should be set as the Channel’s CCLs.
	ContentClassificationLabels []ModifyContentClassificationLabel `json:"content_classification_labels,omitempty"`

	// Boolean flag indicating if the channel has branded content.
	IsBrandedContent *bool `json:"is_branded_content,omitempty"`
}

type ModifyContentClassificationLabel struct {
	// ID of the Content Classification Labels that must be added/removed from the channel.
	ID ccls.ContentClassificationLabel `json:"id"`

	// Boolean flag indicating whether the label should be enabled (true) or disabled for the channel.
	IsEnabled bool `json:"is_enabled"`
}

// Updates a channel’s properties.
//
// Requires a user access token that includes the channel:manage:broadcast scope.
func (c *Channels) ModifyChannelInformation(ctx context.Context, broadcasterID string, body *ModifyChannelInformationRequest) error {
	endpoint := c.baseUrl.ResolveReference(&url.URL{Path: "channels", RawQuery: "broadcaster_id=" + broadcasterID})

	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.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 modify channel information (%d)", res.StatusCode)
	}

	return nil
}