class Network {
    getEnvelope(envelopeKey) {
        return fetch(`/api/envelope/${envelopeKey}`, this.withCSRFToken({ credentials: "include" }))
            .then(res => res.json());
    }

    getDocument(envelopeKey, documentId) {
        return fetch(`/api/document/${envelopeKey}?index=${documentId}`, this.withCSRFToken({ credentials: "include" }))
            .then(res => res.arrayBuffer());
    }

    postDocument(envelopeKey, documentId, buffer) {
        const url = `/api/document/${envelopeKey}?index=${documentId}`;
        const options = {
            credentials: "include",
            method: "POST",
            body: buffer
        }

        console.debug("PostDocument/Calling url: " + url)
        return fetch(url, this.withCSRFToken(options))
            .then(this.handleResponse)
            .then((res) => {
                if (!res.ok) {
                    return false;
                };
                return true;
            });
    }

    postEnvelope(envelopeKey, documentId, jsonString) {
        const url = `/api/envelope/${envelopeKey}?index=${documentId}`;
        const options = {
            credentials: "include",
            method: "POST",
            body: jsonString
        }

        console.debug("PostEnvelope/Calling url: " + url)
        return fetch(url, this.withCSRFToken(options))
            .then(this.handleResponse)
            .then((res) => {
                if (!res.ok) {
                    return false;
                };
                return true;
            });
    }

    postHistory(envelopeKey, actionType, actionDescription) {
        const url = `/api/history/${envelopeKey}`;

        const data = {
            actionDescription: actionDescription,
            actionType: actionType.toString()
        }

        const options = {
            credentials: "include",
            method: "POST",
            headers: {
                'Content-Type': "application/json; charset=utf-8"
            },
            body: JSON.stringify(data)
        }

        console.debug("PostHistory/Calling url: " + url)
        return fetch(url, this.withCSRFToken(options))
            .then(this.handleResponse)
            .then((res) => {
                if (!res.ok) {
                    return false;
                };
                return true;
            });
    }

    withCSRFToken(options) {
        const token = (document.getElementsByName("__RequestVerificationToken")[0]).value;
        let headers = options.headers;
        options.headers = { ...headers, 'X-XSRF-TOKEN': token };

        return options;
    }

    handleResponse(res) {
        if (!res.ok) {
            console.log(`Request failed with status ${res.status}`)
            return res
        } else {
            return res
        }
    }
}