declare var window: any;
const defaultBasePath = '';

export function fetchAsync(method: 'GET' | 'POST' | 'DELETE' | 'PUT', url: string, body?: any) {
    const headers = { 'Content-Type': 'application/json; charset=utf-8' };
    // if (access_token) headers['Authorization'] = `Token ${access_token}`;
    return window.fetch(`${defaultBasePath}${url}`, {
        method,
        headers,
        body: body && JSON.stringify(body)
    }).then((response: any) => {
        if (response.status === 401) {
            window.location.href = '/auth/login';
            // throw new Error('401');
        }
        if (response.status === 403 && url === '/api/v1/organization/') {
            // this indicates a user that is not supposed to be in bx-console
            window.location.href = '/auth/logout';
        }
        const result = response.json();
        if (!response.ok) throw result;
        return result;
    });
}

export function get<T>(url: string): Promise<T> {
    return fetchAsync('GET', url);
}

export function post<T>(url: string, body?: any): Promise<T> {
    return fetchAsync('POST', url, body);
}

export function postWithFile<T>(url: string, body?: any): Promise<T> {
    return fetchWithFile('POST', url, body);
}

export function putWithFile<T>(url: string, body?: any): Promise<T> {
    return fetchWithFile('PUT', url, body);
}

export function fetchWithFile<T>(method: string, url: string, body?: any): Promise<T> {
    return window.fetch(`${defaultBasePath}${url}`, {
        method: method,
        body: body
    }).then((response: any) => {
        if (response.status === 401) {
            window.location.href = '/auth/login';
            // throw new Error('401');
        }
        const result = response.json();
        if (!response.ok) throw result;
        return result;
    })
}

export function del(url: string) {
    return fetchAsync('DELETE', url);
}

export function put(url: string, body?: any) {
    return fetchAsync('PUT', url, body);
}
export function toQueryString(obj: any) {
    const parts = [];
    for (var i in obj) {
        if (obj.hasOwnProperty(i)) {
            parts.push(encodeURIComponent(i) + "=" + encodeURIComponent(obj[i]));
        }
    }
    return parts.join("&");
}

export function serializeObject<T>(form: any) {
    let obj: {[key: string]: any} = {};
    if (typeof form == 'object' && form.nodeName == "FORM") {
        for (let i = 0; i < form.elements.length; i++) {
            const field = form.elements[i];
            if (field.name
                && field.type != 'file'
                && field.type != 'reset'
                && field.type != 'submit'
                && field.type != 'button') {
                if (field.type == 'select-multiple') {
                    obj[field.name] = '';
                    let tempvalue = '';
                    for (let j = 0; j < form.elements[i].options.length; j++) {
                        if (field.options[j].selected)
                            tempvalue += field.options[j].value + ';';
                    }
                    if (tempvalue.charAt(tempvalue.length - 1) === ';') obj[field.name] = tempvalue.substring(0, tempvalue.length - 1);

                } else if ((field.type != 'checkbox' && field.type != 'radio') || field.checked) {
                    obj[field.name] = field.value;
                }
            }
        }
    }
    return obj as T;
}