import { hmac } from "https://deno.land/x/hmac@v2.0.1/mod.ts";

async function postHttpJson(url: string, body: any) {
    const resp = await fetch(url, {
        method: "POST",
        headers: {
            "Content-Type": "application/json",
        },
        body: JSON.stringify(body),
    });
    if (resp.status !== 200) {
        console.error("Send HTTP POST failed", resp);
        throw `Send HTTP POST to: ${url}, failed: ${resp.status}`;
    }
    return resp;
}

const BASE_DING_TALK_URL = "https://oapi.dingtalk.com/robot/send";

export interface SendDingTalkMessageOptions {
    base_url?: string;
    access_token: string;
    sec_token?: string;
}

export interface DingTalkMessageAt {
    atMobiles?: Array<string>;
    atUserIds?: Array<string>;
    isAtAll?: boolean,
}

export interface DingTalkTextMessage {
    content: string;
    at?: DingTalkMessageAt;
}

export interface DingTalkMarkdownMessage {
    title?: string,
    content: string;
    at?: DingTalkMessageAt;
}

export async function sendDingTalkTextMessage(message: DingTalkTextMessage, options: SendDingTalkMessageOptions) {
    return await sendDingTalkMessage({
        msgtype: "text",
        text: {
            content: message.content,
        }
    }, options);
}

export async function sendDingTalkMarkdownMessage(message: DingTalkMarkdownMessage, options: SendDingTalkMessageOptions) {
    return await sendDingTalkMessage({
        msgtype: "markdown",
        markdown: {
            title: message.title || "untitled",
            text: message.content,
        }
    }, options);
}

export async function sendDingTalkMessage(message: any, options: SendDingTalkMessageOptions) {
    let send_url = options.base_url || BASE_DING_TALK_URL;
    send_url += "?access_token=" + encodeURIComponent(options.access_token);
    if (options.sec_token) {
        const timestamp = new Date().getTime();
        const timestamp_and_secret = `${timestamp}\n${options.sec_token}`;
        const sec_token_sign = hmac("sha256", options.sec_token, timestamp_and_secret, "utf8", "base64");
        send_url += "&timestamp=" + timestamp;
        send_url += "&sign=" + encodeURIComponent(sec_token_sign);
    }
    const resp = await postHttpJson(send_url, message);
    const send_ding_talk_resp_body = await resp.json();
    if (send_ding_talk_resp_body.errcode !== 0) {
        console.error("Send DingTalk message failed", send_ding_talk_resp_body);
        throw `Send DingTalk message failed: ${send_ding_talk_resp_body.errcode}`;
    }
}