package chat

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

	"github.com/google/go-querystring/query"
)

type UpdateChatSettingsParams struct {
	// The ID of the broadcaster whose chat settings you want to update.
	BroadcasterID string `url:"broadcaster_id"`

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

type UpdateChatSettingsRequest struct {
	// A Boolean value that determines whether chat messages must contain only emotes.
	//
	// Set to true if only emotes are allowed; otherwise, false. The default is false.
	EmoteMode *bool `json:"emote_mode"`

	// A Boolean value that determines whether the broadcaster restricts the chat room to followers only.
	//
	// Set to true if the broadcaster restricts the chat room to followers only; otherwise, false. The default is true.
	//
	// To specify how long users must follow the broadcaster before being able to participate in the chat room, see the follower_mode_duration field.
	FollowerMode *bool `json:"follower_mode"`

	// The length of time, in minutes, that users must follow the broadcaster before being able to participate in the chat room.
	// Set only if follower_mode is true.
	// Possible values are: 0 (no restriction) through 129600 (3 months).
	// The default is 0.
	FollowerModeDuration *int `json:"follower_mode_duration"`

	// A Boolean value that determines whether the broadcaster adds a short delay before chat messages appear in the chat room.
	// This gives chat moderators and bots a chance to remove them before viewers can see the message.
	//
	// Set to true if the broadcaster applies a delay; otherwise, false.
	// The default is false.
	//
	// To specify the length of the delay, see the non_moderator_chat_delay_duration field.
	NonModeratorChatDelay *bool `json:"non_moderator_chat_delay"`

	// The amount of time, in seconds, that messages are delayed before appearing in chat. Set only if non_moderator_chat_delay is true.
	// Possible values are:
	//
	// 2 — 2 second delay (recommended)
	//
	// 4 — 4 second delay
	//
	// 6 — 6 second delay
	NonModeratorChatDelayDuration *int `json:"non_moderator_chat_delay_duration"`

	// A Boolean value that determines whether the broadcaster limits how often users in the chat room are allowed to send messages.
	// Set to true if the broadcaster applies a wait period between messages; otherwise, false.
	// The default is false.
	//
	// To specify the delay, see the slow_mode_wait_time field.
	SlowMode bool `json:"slow_mode"`

	// The amount of time, in seconds, that users must wait between sending messages.
	// Set only if slow_mode is true.
	//
	// Possible values are: 3 (3 second delay) through 120 (2 minute delay). The default is 30 seconds.
	SlowModeWaitTime *int `json:"slow_mode_wait_time"`

	// A Boolean value that determines whether only users that subscribe to the broadcaster’s channel may talk in the chat room.
	//
	// Set to true if the broadcaster restricts the chat room to subscribers only; otherwise, false.
	// The default is false.
	SubscriberMode *bool `json:"subscriber_mode"`

	// A Boolean value that determines whether the broadcaster requires users to post only unique messages in the chat room.
	//
	// Set to true if the broadcaster allows only unique messages; otherwise, false.
	// The default is false.
	UniqueChatMode *bool `json:"unique_chat_mode"`
}

type UpdateChatSettingsResponse struct {
	// The list of chat settings. The list contains a single object with all the settings.
	Data []Settings `json:"data"`
}

// Updates the broadcaster’s chat settings.
//
// Requires a user access token that includes the moderator:manage:chat_settings scope.
func (c *Chat) UpdateChatSettings(ctx context.Context, params *UpdateChatSettingsParams, body *UpdateChatSettingsRequest) (*UpdateChatSettingsResponse, error) {
	v, _ := query.Values(body)
	endpoint := c.baseUrl.ResolveReference(&url.URL{Path: "chat/settings", 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.MethodPatch, endpoint.String(), 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 chat settings (%d)", res.StatusCode)
	}

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

	return &data, nil
}