import type { AeroflyFlight } from "@fboes/aerofly-custom-missions";
import type { Config } from "./Config.js";
import fs from "node:fs";
import path from "node:path";
import { AeroflyFileParser } from "../converter/parser/AeroflyFileParser.js";
import { AeroflyMainConfigParser } from "../converter/parser/AeroflyMainConfigParser.js";

export class AeroflyMainConfigReaderError extends Error {
    constructor(
        message: string,
        public readonly code: "MISSING_SETUP" = "MISSING_SETUP",
    ) {
        super(message);
        this.name = this.constructor.name;
    }
}

/**
 * Reader to convert `main.mcf` file into `AeroflyFlight` class instance.
 */
export class AeroflyMainConfigReader {
    constructor(private config: Config) {}

    get mainCfgFileName() {
        if (!this.config.mainMcfFilePath) {
            throw new AeroflyMainConfigReaderError("mainMcfFilePath is not defined in the config.");
        }

        if (!fs.existsSync(this.config.mainMcfFilePath)) {
            throw new AeroflyMainConfigReaderError(
                `The specified mainMcfFilePath does not exist: ${this.config.mainMcfFilePath}`,
            );
        }

        const filename = path.join(this.config.mainMcfFilePath, "main.mcf");

        if (!fs.existsSync(filename)) {
            throw new AeroflyMainConfigReaderError(`The main.cfg does not exists at ${filename}`);
        }
        return filename;
    }

    read(): AeroflyFlight {
        const mainMcfContent = fs.readFileSync(this.mainCfgFileName, "utf-8");
        return this.parseMainMcf(mainMcfContent);
    }

    parseMainMcf(mainMcfContent: string): AeroflyFlight {
        const parser = new AeroflyMainConfigParser();
        return parser.parse(mainMcfContent);
    }

    write(flight: AeroflyFlight): void {
        // Open the main.mcf file
        let mainMcfContent = fs.readFileSync(this.mainCfgFileName, "utf-8");

        // Replace the appropriate sections with the data from the AeroflyFlight object
        const parser = new AeroflyFileParser();
        mainMcfContent = parser.setGroup(
            mainMcfContent,
            "tmsettings_aircraft",
            2,
            flight.aircraft.getElement().toString(2),
        );
        mainMcfContent = parser.setGroup(
            mainMcfContent,
            "tmsettings_flight",
            2,
            flight.flightSetting.getElement().toString(2),
        );
        mainMcfContent = parser.setGroup(mainMcfContent, "tm_time_utc", 2, flight.timeUtc.getElement().toString(2));
        mainMcfContent = parser.setGroup(mainMcfContent, "tmsettings_wind", 2, flight.wind.getElement().toString(2));
        mainMcfContent = parser.setGroup(mainMcfContent, "tmsettings_clouds", 2, flight.getCloudsElement().toString(2));
        mainMcfContent = parser.setGroup(
            mainMcfContent,
            "tmnavigation_config",
            2,
            flight.navigation.getElement().toString(2),
        );
        mainMcfContent = parser.setGroup(
            mainMcfContent,
            "tmsettings_fuel_load",
            2,
            flight.fuelLoadSetting.getElement().toString(2),
        );
        mainMcfContent = parser.setNumber(mainMcfContent, "visibility", flight.visibility);

        // Save the modified content back to the main.mcf file
        fs.writeFileSync(this.mainCfgFileName, mainMcfContent, "utf-8");
    }
}