import { OptionType } from "../interfaces/CommandOption";
import { ICommand, CommandDefinition } from "../interfaces/Command";
import SubcommandOption from "./SubcommandOption";
import SubcommandGroupOption from "./SubcommandGroupOption";
import CommandOption from "./CommandOption";
import { ArgsResult } from "../Parser";

abstract class Command implements ICommand {

    name: string;
    aliases: string[];
    options: CommandOption[];

    constructor (def: CommandDefinition) {

        if (typeof def !== 'object') 
            throw new Error('Missing command definition');
        
        if (!def.name) 
            throw new Error('Missing name for command');
        this.name = def.name;

        this.aliases = def.aliases || [];

        this.options = [];
        for (const opt of def.options || []) {
            if (opt instanceof CommandOption) 
                this.options.push(opt);
            else 
                this.options.push(new CommandOption(opt));
        }
        if (this.options.some(opt => [ OptionType.SUB_COMMAND, OptionType.SUB_COMMAND_GROUP ].includes(opt.type))
            && this.options.some(opt => ![ OptionType.SUB_COMMAND, OptionType.SUB_COMMAND_GROUP ].includes(opt.type))) 
            throw new Error('Cannot have subcommand(group)s on the same level as an option');

    }

    abstract execute(message: unknown, args?: ArgsResult): Promise<unknown>;

    get subcommands (): SubcommandOption[] {
        return this._subcommands(this.options);
    }

    get subcommandGroups (): SubcommandGroupOption[] {
        return this.options.filter((opt) => opt.type === OptionType.SUB_COMMAND_GROUP);
    }

    subcommand (name: string): SubcommandOption | null {
        name = name.toLowerCase();
        return this.subcommands.find((cmd) => cmd.name === name || cmd.aliases.includes(name)) || null;
    }

    subcommandGroup (name: string): SubcommandGroupOption | null {
        name = name.toLowerCase();
        return this.subcommandGroups.find((grp) => grp.name === name || grp.aliases.includes(name)) || null;
    }

    private _subcommands (options: CommandOption[]): SubcommandOption[] {
        const subcommands: SubcommandOption[] = [];
        for (const opt of options) {
            if (opt.type === OptionType.SUB_COMMAND) 
                subcommands.push(opt);
            else if (opt.type === OptionType.SUB_COMMAND_GROUP) 
                subcommands.push(...this._subcommands(opt.options));
        }

        return subcommands;
    }

}

export { Command };
export default Command;