// Remember The Milk CSV export, by Evan Hahn
//
// Copy-paste this whole file into a new MilkScript.
//
// See <https://evanhahn.com/remember-the-milk-csv-export-script> for more details.
//
// This code is licensed under the ACSL. See full license at <https://gitlab.com/EvanHahn/rtm-csv-export/-/blob/main/LICENSE.txt>.

class MissingCaseError extends Error {
    constructor(_value){
        super("This should be impossible");
    }
}
const serializeString = (str)=>shouldFieldBeQuoted(str) ? `"${str.replace(/"/gm, '""')}"` : str;
const serialize = (value)=>{
    switch(typeof value){
        case "string":
            return serializeString(value);
        case "number":
            return Number.isNaN(value) ? "" : String(value);
        case "bigint":
        case "boolean":
            return String(value);
        case "undefined":
            return "";
        case "object":
            if (value === null) return "";
            return serializeDate(value);
        default:
            throw new MissingCaseError(value);
    }
};
const row = (values)=>values.map(serialize).join(",");
const shouldFieldBeQuoted = (str)=>str.includes(",") || str.includes('"') || str.includes("\r\n");
const serializeDate = (date)=>isNaN(date.valueOf()) ? "" : date.toISOString();
const values = (obj, keys)=>keys.map((key)=>obj[key]);
const stringify = ({ keys , objects  })=>{
    let result = "";
    result += row(keys);
    for (const obj of objects){
        result += "\r\n";
        result += row(values(obj, keys));
    }
    return result;
};
const formatDateThatMightHaveTime = (date, hasTime)=>{
    if (!date || isNaN(date.valueOf())) return null;
    return hasTime ? date : date.toISOString().slice(0, 10);
};
const formatPriority = (priority)=>{
    if (!priority) return null;
    const result = priority.toString();
    return result === "NoPriority" ? null : result;
};
const formatTask = (task)=>({
        "Completed": task.isCompleted(),
        "Due Date": formatDateThatMightHaveTime(task.getDueDate(), task.hasDueTime()),
        "Estimate (minutes)": task.getEstimate()?.getMinutes() || null,
        Name: task.getName(),
        Priority: formatPriority(task.getPriority())
    });
(()=>{
    const tasks = rtm.getSelectedTasks();
    if (!tasks.length) {
        return rtm.newMessage("No tasks selected", "Select 1 or more tasks to export as CSV.");
    }
    const csvData = stringify({
        keys: [
            "Name",
            "Completed",
            "Estimate (minutes)",
            "Due Date",
            "Priority"
        ],
        objects: tasks.map(formatTask)
    });
    return rtm.newFile(csvData, rtm.MediaType.CSV, "remember_the_milk.csv");
})();