class Computer {
    constructor(ramMemory, cpuGHz, hddMemory) {
        this.ramMemory = ramMemory,
            this.cpuGHz = cpuGHz,
            this.hddMemory = hddMemory,
            this.taskManager = [],
            this.installedPrograms = []
    }

    installAProgram(name, requiredSpace) {
        if (this.hddMemory < requiredSpace) {
            throw new Error("There is not enough space on the hard drive");
        }

        let foundProgram = this.installedPrograms.find(program => program.name === name);
        let newObj = {
            name: name,
            requiredSpace: requiredSpace
        };
        if (!foundProgram) {
            this.installedPrograms.push(newObj);
        }

        this.hddMemory -= requiredSpace;
        return newObj;
    }

    uninstallAProgram(name) {
        let foundProgram = this.installedPrograms.find(program => program.name === name);

        if (!foundProgram) {
            throw new Error("Control panel is not responding");
        }

        let foundIndex = this.installedPrograms.findIndex(program => program.name === name);
        this.installedPrograms.splice(foundIndex, 1);

        this.hddMemory += foundProgram.requiredSpace;
        return this.installedPrograms;
    }

    openAProgram(name) {
        let foundProgram = this.installedPrograms.find(program => program.name === name);
        let alreadyOpenedProgram = this.taskManager.find(program => program.name === name);

        if (!foundProgram) {
            throw new Error(`The ${name} is not recognized`);
        }

        if (alreadyOpenedProgram) {
            throw new Error(`The ${name} is already open`);
        }

        let ramNeeded = (foundProgram.requiredSpace / this.ramMemory) * 1.5;
        let cpuUsage = ( ( foundProgram.requiredSpace / this.cpuGHz ) / 500) * 1.5;

        if (ramNeeded >= 100) {
            if (cpuUsage >= 100) {
                throw new Error(`${name} caused out of memory exception`);
            }
            throw new Error(`${name} caused out of memory exception`);
        }

        if (cpuUsage >= 100) {
            throw new Error(`${name} caused out of cpu exception`);
        }

        let newObj = {
            name: name,
            ramUsage: ramNeeded,
            cpuUsage: cpuUsage,
        };

        this.taskManager.push(newObj);
        return newObj;
    }

    taskManagerView() {
        if (this.taskManager.length == 0) {
            return  "All running smooth so far";
        }

        return this.taskManager
            .map(task => {
                return `Name - ${task.name} | Usage - CPU: ${task.cpuUsage.toFixed(0)}%, RAM: ${task.ramUsage.toFixed(0)}%`;
            }).join('\n');

    }
}