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

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

        this.hddMemory -= requiredSpace;
        let program = {
            name: name,
            requiredSpace: requiredSpace
        };

        this.installedPrograms.push(program);

        return program;
    }

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

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

       this.hddMemory += program.requiredSpace;
       let index = this.installedPrograms.findIndex(p => p.name === name);
       this.installedPrograms.splice(index, 1);

       return this.installedPrograms;
    }

    openAProgram(name) {
        let program = this.installedPrograms.find(p => p.name === name);
        let openProgram = this.taskManager.find(p => p.name === name)

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

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

        let ram = (program.requiredSpace / this.ramMemory) * 1.5;
        let cpu = ((program.requiredSpace / this.cpuGHz) / 500) * 1.5;

        let currentProgram = {
            name: name,
            ramUsage: ram,
            cpuUsage: cpu
        };

        let totalRamUsage = 0;
        let totalCpuUsage = 0;

        if (this.taskManager.length > 0) {
            totalRamUsage = this.taskManager.map(r => r.ramUsage).reduce((acc, curr) => acc + curr);
            totalCpuUsage = this.taskManager.map(c =>c.cpuUsage).reduce((acc, curr) => acc + curr);
        }

        if (totalRamUsage + ram >= 100) {
            throw new Error(`${name} caused out of memory exception`)
        }
        if (totalCpuUsage + cpu >= 100) {
            throw new Error(`${name} caused out of cpu exception`)
        }

        this.taskManager.push(currentProgram);

        return currentProgram;
    }

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

        let finalResult = [];

        for (const program of this.taskManager) {
            let result = "";
            result = `Name - ${program.name} | Usage - CPU: ${program.cpuUsage.toFixed(0)}%, RAM: ${program.ramUsage.toFixed(0)}%`;
            finalResult.push(result);
        }

        return finalResult.join('\n');
    }
}