/**
 * Wush environment manager
 * Manages environment variables, aliases etc.
 */
export class Environment {
    private variables: Record<string, string> = {}
    private aliases: Record<string, string> = {}

    SetVariable(name: string, value: any | null): void {
        if (value === null) {
            // remove the variable if value is null
            delete this.variables[name]
        } else this.variables[name] = String(value)
    }

    GetVariable(name: string): string | null {
        return this.variables[name] ?? null
    }

    SetAlias(name: string, value: string | null): void {
        if (value === null) {
            // remove the alias if value is null
            delete this.aliases[name]
        } else this.aliases[name] = value
    }

    GetAlias(name: string): string | null {
        return this.aliases[name] ?? null
    }

    GetAliasesByValue(value: string): string[] | null {
        const keys: string[] = []

        for (const key in this.aliases)
            if (this.aliases[key] === value)
                keys.push(key)

        return keys.length === 0 ? null : keys
    }
}