/**
 * Abstract Base Class for any Server object
 */
import { CodingContract } from "../CodingContracts";
import { Message } from "../Message/Message";
import { RunningScript } from "../Script/RunningScript";
import { Script } from "../Script/Script";
import { isValidFilePath } from "../Terminal/DirectoryHelpers";
import { TextFile } from "../TextFile";
import { IReturnStatus } from "../types";

import { isScriptFilename } from "../Script/ScriptHelpersTS";

import { createRandomIp } from "../../utils/IPAddress";
import { compareArrays } from "../../utils/helpers/compareArrays";

interface IConstructorParams {
    adminRights?: boolean;
    hostname: string;
    ip?: string;
    isConnectedTo?: boolean;
    maxRam?: number;
    organizationName?: string;
}

export class BaseServer {
    // Coding Contract files on this server
    contracts: CodingContract[] = [];

    // How many CPU cores this server has. Maximum of 8.
    // Currently, this only affects hacking missions
    cpuCores = 1;

    // Flag indicating whether the FTP port is open
    ftpPortOpen = false;

    // Flag indicating whether player has admin/root access to this server
    hasAdminRights = false;

    // Hostname. Must be unique
    hostname = "";

    // Flag indicating whether HTTP Port is open
    httpPortOpen = false;

    // IP Address. Must be unique
    ip = "";

    // Flag indicating whether player is curently connected to this server
    isConnectedTo = false;

    // RAM (GB) available on this server
    maxRam = 0;

    // Message files AND Literature files on this Server
    // For Literature files, this array contains only the filename (string)
    // For Messages, it contains the actual Message object
    // TODO Separate literature files into its own property
    messages: (Message | string)[] = [];

    // Name of company/faction/etc. that this server belongs to.
    // Optional, not applicable to all Servers
    organizationName = "";

    // Programs on this servers. Contains only the names of the programs
    programs: string[] = [];

    // RAM (GB) used. i.e. unavailable RAM
    ramUsed = 0;

    // RunningScript files on this server
    runningScripts: RunningScript[] = [];

    // Script files on this Server
    scripts: Script[] = [];

    // Contains the IP Addresses of all servers that are immediately
    // reachable from this one
    serversOnNetwork: string[] = [];

    // Flag indicating whether SMTP Port is open
    smtpPortOpen = false;

    // Flag indicating whether SQL Port is open
    sqlPortOpen = false;

    // Flag indicating whether the SSH Port is open
    sshPortOpen = false;

    // Text files on this server
    textFiles: TextFile[] = [];

    constructor(params: IConstructorParams={ hostname: "", ip: createRandomIp() }) {
        this.ip = params.ip ? params.ip : createRandomIp();

        this.hostname           =     params.hostname;
        this.organizationName   =     params.organizationName != null ? params.organizationName   : "";
        this.isConnectedTo      =     params.isConnectedTo  != null   ? params.isConnectedTo      : false;

        //Access information
        this.hasAdminRights     =    params.adminRights != null       ? params.adminRights        : false;
    }

    addContract(contract: CodingContract) {
        this.contracts.push(contract);
    }

    getContract(contractName: string): CodingContract | null {
        for (const contract of this.contracts) {
            if (contract.fn === contractName) {
                return contract;
            }
        }
        return null;
    }

    /**
     * Find an actively running script on this server
     * @param scriptName - Filename of script to search for
     * @param scriptArgs - Arguments that script is being run with
     * @returns RunningScript for the specified active script
     *          Returns null if no such script can be found
     */
    getRunningScript(scriptName: string, scriptArgs: any[]): RunningScript | null {
        for (const rs of this.runningScripts) {
            if (rs.filename === scriptName && compareArrays(rs.args, scriptArgs)) {
                return rs;
            }
        }

        return null;
    }

    /**
     * Given the name of the script, returns the corresponding
     * Script object on the server (if it exists)
     */
    getScript(scriptName: string): Script | null {
        for (let i = 0; i < this.scripts.length; i++) {
            if (this.scripts[i].filename === scriptName) {
                return this.scripts[i];
            }
        }

        return null;
    }

    /**
     * Returns boolean indicating whether the given script is running on this server
     */
    isRunning(fn: string): boolean {
        for (const runningScriptObj of this.runningScripts) {
            if (runningScriptObj.filename === fn) {
                return true;
            }
        }

        return false;
    }

    removeContract(contract: CodingContract) {
        if (contract instanceof CodingContract) {
            this.contracts = this.contracts.filter((c) => {
                return c.fn !== contract.fn;
            });
        } else {
            this.contracts = this.contracts.filter((c) => {
                return c.fn !== contract;
            });
        }
    }

    /**
     * Remove a file from the server
     * @param fn {string} Name of file to be deleted
     * @returns {IReturnStatus} Return status object indicating whether or not file was deleted
     */
    removeFile(fn: string): IReturnStatus {
        if (fn.endsWith(".exe") || fn.match(/^.+\.exe-\d+(?:\.\d*)?%-INC$/) != null) {
            for (let i = 0; i < this.programs.length; ++i) {
                if (this.programs[i] === fn) {
                   this.programs.splice(i, 1);
                   return { res: true };
                }
            }
        } else if (isScriptFilename(fn)) {
            for (let i = 0; i < this.scripts.length; ++i) {
                if (this.scripts[i].filename === fn) {
                    if (this.isRunning(fn)) {
                        return {
                            res: false,
                            msg: "Cannot delete a script that is currently running!",
                        };
                    }

                    this.scripts.splice(i, 1);
                    return { res: true };
                }
            }
        } else if (fn.endsWith(".lit")) {
            for (let i = 0; i < this.messages.length; ++i) {
                const f = this.messages[i];
                if (typeof f === "string" && f === fn) {
                    this.messages.splice(i, 1);
                    return { res: true };
                }
            }
        } else if (fn.endsWith(".txt")) {
            for (let i = 0; i < this.textFiles.length; ++i) {
                if (this.textFiles[i].fn === fn) {
                    this.textFiles.splice(i, 1);
                    return { res: true };
                }
            }
        } else if (fn.endsWith(".cct")) {
            for (let i = 0; i < this.contracts.length; ++i) {
                if (this.contracts[i].fn === fn) {
                    this.contracts.splice(i, 1);
                    return { res: true };
                }
            }
        }

        return { res: false, msg: "No such file exists" };
    }

    /**
     * Called when a script is run on this server.
     * All this function does is add a RunningScript object to the
     * `runningScripts` array. It does NOT check whether the script actually can
     * be run.
     */
    runScript(script: RunningScript): void {
        this.runningScripts.push(script);
    }

    setMaxRam(ram: number): void {
        this.maxRam = ram;
    }

    /**
     * Write to a script file
     * Overwrites existing files. Creates new files if the script does not eixst
     */
    writeToScriptFile(fn: string, code: string) {
        const ret = { success: false, overwritten: false };
        if (!isValidFilePath(fn) || !isScriptFilename(fn)) { return ret; }

        // Check if the script already exists, and overwrite it if it does
        for (let i = 0; i < this.scripts.length; ++i) {
            if (fn === this.scripts[i].filename) {
                const script = this.scripts[i];
                script.code = code;
                script.updateRamUsage(this.scripts);
                script.markUpdated();
                ret.overwritten = true;
                ret.success = true;
                return ret;
            }
        }

        // Otherwise, create a new script
        const newScript = new Script(fn, code, this.ip, this.scripts);
        this.scripts.push(newScript);
        ret.success = true;
        return ret;
    }

    // Write to a text file
    // Overwrites existing files. Creates new files if the text file does not exist
    writeToTextFile(fn: string, txt: string) {
        const ret = { success: false, overwritten: false };
        if (!isValidFilePath(fn) || !fn.endsWith("txt")) { return ret; }

        // Check if the text file already exists, and overwrite if it does
        for (let i = 0; i < this.textFiles.length; ++i) {
            if (this.textFiles[i].fn === fn) {
                ret.overwritten = true;
                this.textFiles[i].text = txt;
                ret.success = true;
                return ret;
            }
        }

        // Otherwise create a new text file
        const newFile = new TextFile(fn, txt);
        this.textFiles.push(newFile);
        ret.success = true;
        return ret;
    }
}