package moderation

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

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

type AddBlockedTermParams struct {
	// The ID of the broadcaster that owns the list of blocked terms.
	BroadcasterID string `url:"broadcaster_id"`

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

type AddBlockedTermRequest struct {
	// The word or phrase to block from being used in the broadcaster’s chat room.
	// The term must contain a minimum of 2 characters and may contain up to a maximum of 500 characters.
	//
	// Terms may include a wildcard character (*).
	// The wildcard character must appear at the beginning or end of a word or set of characters.
	// For example, *foo or foo*.
	//
	// If the blocked term already exists, the response contains the existing blocked term.
	Text string `json:"text"`
}

type AddBlockedTermResponse struct {
	// A list that contains the single blocked term that the broadcaster added.
	Data []BlockedTerm `json:"data"`
}

// Adds a word or phrase to the broadcaster’s list of blocked terms.
// These are the terms that the broadcaster doesn’t want used in their chat room.
//
// Requires a user access token that includes the moderator:manage:blocked_terms scope.
func (m *Moderation) AddBlockedTerm(ctx context.Context, params *AddBlockedTermParams, body *AddBlockedTermRequest) (*AddBlockedTermResponse, error) {
	v, _ := query.Values(params)
	endpoint := m.baseUrl.ResolveReference(&url.URL{Path: "moderation/blocked_terms", 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 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 add blocked term (%d)", res.StatusCode)
	}

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

	return &data, nil
}