/**
	Monitor the occurences of a given join point;
*/

import Query from "@specs-feup/lara/api/weaver/Query.js";
import { App, Class, Constructor, Field, FileJp } from "../../Joinpoints.js";

export function CountingMonitorList(
    targetClass: Class,
    monitorPackage = "pt.up.fe.specs.lara.kadabra.utils"
) {
    const monitor = GetCountingMonitorList(
        monitorPackage,
        "CountingMonitorList"
    );
    if (monitor === undefined) {
        throw new Error(
            "Expected monitorClass to be of type Class but was undefined."
        );
    }

    let name = "kadabra" + monitor.name;

    let counter = 0;
    while (
        Query.searchFrom(targetClass, Field, {
            name: (n) => n == name + counter,
        }).get().length !== 0
    ) {
        counter++;
    }

    function callMethod(method: string, arg: string) {
        return name + "." + method + "(" + arg + ");";
    }

    name += counter;
    const get = function (id: string) {
        return callMethod("get", id);
    };
    const reset = function (id: string) {
        return callMethod("reset", id);
    };
    const increment = function (id: string) {
        return callMethod("increment", id);
    };
    const init = function (size: string) {
        const modifiers = ["private", "static"];
        targetClass.newField(
            modifiers,
            monitor.qualifiedName,
            name,
            "new " + monitor.name + "(" + size + ")"
        );
    };

    return {
        name: name,
        increment: increment,
        get: get,
        reset: reset,
        init: init,
    };
}

/**
	Returns the counting monitor list. if it does not exist creates a new class
*/
export function GetCountingMonitorList(
    packageName: string,
    simpleName: string
) {
    const monitorClass = Query.search(FileJp)
        .search(Class, {
            name: simpleName,
            packageName: packageName,
        })
        .getFirst();

    if (monitorClass !== undefined) {
        return monitorClass;
    }

    return NewCountingMonitorList(packageName, simpleName);
}

export function NewCountingMonitorList(
    packageName: string,
    simpleName: string
) {
    const className = packageName + "." + simpleName;
    const monitorClass = (Query.root() as App).newClass(className);

    if (monitorClass === undefined) {
        return undefined;
    }

    monitorClass.newField(["private"], "int[]", "counter");
    monitorClass.newMethod(
        ["public"],
        "void",
        "increment",
        ["int"],
        ["id"],
        "counter[id]++;"
    );
    monitorClass.newMethod(
        ["public"],
        "int",
        "get",
        ["int"],
        ["id"],
        "return counter[id];"
    );
    monitorClass.newMethod(
        ["public"],
        "void",
        "reset",
        ["int"],
        ["id"],
        "counter[id] = 0;"
    );
    monitorClass.newConstructor(["public"], ["int"], ["size"]);

    const constructor = Query.searchFrom(
        monitorClass,
        Constructor,
        "increment"
    ).getFirst();
    if (constructor === undefined) {
        throw new Error(
            "Expected constructor to be of type Constructor but was undefined"
        );
    }
    constructor.body.insertReplace("counter = new int[size];");

    return monitorClass;
}