import { parseArgs } from "jsr:@std/cli/parse-args";

const botToken = Deno.env.get("BOT_TOKEN");

if (!botToken) {
    console.error("BOT_TOKEN environment variable must be set.");
    Deno.exit(1);
}

async function makeTelegramRequest(
    command: string,
    additionalParam: typeof args,
) {
    const url =
        `https://api.telegram.org/bot${botToken}/${command}?chat_id=${additionalParam.chat_id}`;

    const formData = new FormData();

    switch (command) {
        case "sendMessage": {
            formData.append("text", additionalParam.text);
            if (additionalParam.parse_mode) {
                formData.append("parse_mode", additionalParam.parse_mode);
            }
            break;
        }
        case "sendMediaGroup": {
            const jsonData = [];
            for (let i = 0; i < additionalParam.files.length; i++) {
                const file = await Deno.readFile(additionalParam.files[i]);
                formData.append(
                    `file${i}`,
                    new Blob([file]),
                    additionalParam.files[i],
                );
                if (i == 0) {
                    jsonData.push({
                        "parse_mode": additionalParam.parse_mode,
                        "caption": additionalParam.caption,
                        "type": "photo",
                        "media": `attach://file${i}`,
                    });
                } else {
                    jsonData.push({
                        "type": "photo",
                        "media": `attach://file${i}`,
                    });
                }
            }
            formData.append("media", JSON.stringify(jsonData));
            break;
        }
        case "sendPhoto": {
            const file = await Deno.readFile(additionalParam.file);
            formData.append(
                "photo",
                new Blob([file]),
                additionalParam.file,
            );
            if (additionalParam.caption) {
                formData.append("caption", additionalParam.caption);
            }
            if (additionalParam.parse_mode) {
                formData.append("parse_mode", additionalParam.parse_mode);
            }
            break;
        }
        case "deleteMessage": {
            formData.append("message_id", additionalParam.message_id);
            break;
        }
        default: {
            console.log("Unknown command");
            return;
        }
    }

    const response = await fetch(url, {
        method: "POST",
        body: formData,
    });

    const data = await response.json();
    console.info(data);
}

const args = parseArgs(Deno.args, {
    string: [
        "chat_id",
        "caption",
        "text",
        "file",
        "files",
        "message_id",
        "parse_mode",
    ],
    default: {
        chat_id: "0",
        caption: "",
        text: "",
        file: "",
        files: [],
        message_id: "0",
        parse_mode: "MarkdownV2",
    },
});
const command = String(args._[0]);

if (!command) {
    console.error("Missing arguments. Usage: <command> <additional_arguments>");
    console.error("Supported commands:");
    console.error("  sendMessage: Sends a text message");
    console.error("  sendPhoto: Sends a photo");
    console.error("  sendMediaGroup: Sends a media group");
    console.error("  deleteMessage: Deletes a message");
    Deno.exit(1);
}

await makeTelegramRequest(command, args);