package moderation

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

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

type GetModeratorsParams struct {
	// The ID of the broadcaster whose list of moderators you want to get. This ID must match the user ID in the access token.
	BroadcasterID string `url:"broadcaster_id"`

	// A list of user IDs used to filter the results.
	// To specify more than one ID, include this parameter for each moderator you want to get.
	// For example, user_id=1234&user_id=5678.
	// You may specify a maximum of 100 IDs.
	//
	// The returned list includes only the users from the list who are moderators in the broadcaster’s channel.
	// The list is returned in the same order as you specified the IDs.
	UserID []string `url:"user_id,omitempty"`

	// The maximum number of items to return per page in the response.
	// The minimum page size is 1 item per page and the maximum is 100 items per page.
	// The default is 20.
	First *int `url:"first,omitempty"`

	// The cursor used to get the next page of results. The Pagination object in the response contains the cursor’s value.
	// Read More: https://dev.twitch.tv/docs/api/guide#pagination
	After *types.Cursor `url:"after,omitempty"`
}

type GetModeratorsResponse struct {
	// The list of moderators. The list contains a single object that contains all the moderators.
	Data []GetModeratorsResponseData `json:"data"`

	// Contains information about the pagination in the response.
	// The object is empty if there are no more pages of results.
	// Read More: https://dev.twitch.tv/docs/api/guide#pagination
	Pagination types.Pagination `json:"pagination"`
}

type GetModeratorsResponseData struct {
	// The ID of the user that has permission to moderate the broadcaster’s channel.
	UserID string `json:"user_id"`

	// The user’s login name.
	UserLogin string `json:"user_login"`

	// The user’s display name.
	UserName string `json:"user_name"`
}

// Gets all users allowed to moderate the broadcaster’s chat room.
//
// Requires a user access token that includes the moderation:read scope.
// If your app also adds and removes moderators, you can use the channel:manage:moderators scope instead.
func (m *Moderation) GetModerators(ctx context.Context, params *GetModeratorsParams) (*GetModeratorsResponse, error) {
	v, _ := query.Values(params)
	endpoint := m.baseUrl.ResolveReference(&url.URL{Path: "moderation/moderators", RawQuery: v.Encode()})

	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), nil)
	if err != nil {
		return nil, err
	}

	res, err := m.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 moderators (%d)", res.StatusCode)
	}

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

	return &data, nil
}