import { ActionConfig } from "./ActionConfig";


/** Utility class for managing debug mode and diagnostic information */
export class DebugManager {
    private constructor() { }

    private static instance: DebugManager;
    /** Returns the singleton instance of the DebugManager */
    public static getInstance(): DebugManager {
        if (!DebugManager.instance) {
            DebugManager.instance = new DebugManager();
        }
        return DebugManager.instance;
    }

    /** Clears the singleton instance of the DebugManager (used for testing) */
    public static clearState() {
        DebugManager.instance = new DebugManager();
    }


    private debugEnabled: boolean = false;
    private replayMode: boolean = false;
    private diagnosticInfo: DiagnosticInfo | null = null;

    /** Returns true if debug mode is enabled */
    public isDebugEnabled(): boolean {
        return this.debugEnabled;
    }

    /** Returns true if replay mode is enabled */
    public isReplayMode(): boolean {
        return this.replayMode;
    }

    initializeConfig(config: ActionConfig) {
        if (config.debug) {
            this.setDebugEnabled(true);
        } else if (config.replay.length > 0) {
            this.replayFromDiagnostics(config.replay);
        }
    }


    /** Enables or disables debug mode, also clears any existing diagnostics info */
    public setDebugEnabled(enableDebug: boolean = true): void {
        this.debugEnabled = enableDebug;
        this.replayMode = false;
        this.diagnosticInfo = new DiagnosticInfo();
    };

    /** Enables replay mode and loads the diagnostic information from the specified string */
    public replayFromDiagnostics(diagnostics: string): void {
        this.debugEnabled = false
        this.replayMode = true;
        this.diagnosticInfo = JSON.parse(diagnostics);
    }

    /** Returns a JSON string containing the diagnostic information for this run */
    public getDebugOutput(emptyRepo: boolean = false): string {
        return this.isDebugEnabled() ? JSON.stringify(this.diagnosticInfo) : '';
    }

    /** Records a command and its output for diagnostic purposes */
    public recordCommand(command: string, args: any[], output: string, stderr: string, error: any): void {
        if (this.isDebugEnabled()) {
            this.diagnosticInfo?.recordCommand(command, args, output, stderr, error);
        }
    }

    /** Replays the specified command and returns the output */
    public replayCommand(command: string, args: any[]): string {
        if (this.diagnosticInfo === null) {
            throw new Error('No diagnostic information available for replay');
        }

        const commandResult = this.diagnosticInfo.commands.find(c => c.command === command && JSON.stringify(c.args) === JSON.stringify(args));
        if (!commandResult) {
            throw new Error(`No result found in diagnostic for command "${command}"`);
        }
        if (commandResult.error) {
            throw commandResult.error;
        }
        if (commandResult.stderr) {
            console.error(commandResult.stderr);
        }
        return commandResult.output;
    }
}

/** Represents a CLI command result */
class CommandResult {
    public command: string;
    public args: any[];
    public output: string;
    public stderr: string;
    public error: any;
    public constructor(command: string, args: any[], output: string, stderr: string, error: any) {
        this.command = command;
        this.args = args;
        this.output = output;
        this.stderr = stderr;
        this.error = error;
    }
}

/** Represents the result of the commands executed for a run */
class DiagnosticInfo {
    public commands: CommandResult[] = [];
    public empty: boolean = false;
    public recordCommand(command: string, args: any[], output: string, stderr: string, error: any): void {
        this.commands.push(new CommandResult(command, args, output, stderr, error));
    }
}