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import mri from 'mri';import * as $ from './utils';import { ALL, DEF } from './utils';
class Sade {	constructor(name, isOne) {		let [bin, ...rest] = name.split(/\s+/);		isOne = isOne || rest.length > 0;
		this.bin = bin;		this.ver = '0.0.0';		this.default = '';		this.tree = {};		// set internal shapes;		this.command(ALL);		this.command([DEF].concat(isOne ? rest : '<command>').join(' '));		this.single = isOne;		this.curr = ''; // reset	}
	command(str, desc, opts={}) {		if (this.single) {			throw new Error('Disable "single" mode to add commands');		}
		// All non-([|<) are commands		let cmd=[], usage=[], rgx=/(\[|<)/;		str.split(/\s+/).forEach(x => {			(rgx.test(x.charAt(0)) ? usage : cmd).push(x);		});
		// Back to string~!		cmd = cmd.join(' ');
		if (cmd in this.tree) {			throw new Error(`Command already exists: ${cmd}`);		}
		// re-include `cmd` for commands		cmd.includes('__') || usage.unshift(cmd);		usage = usage.join(' '); // to string
		this.curr = cmd;		if (opts.default) this.default=cmd;
		this.tree[cmd] = { usage, alibi:[], options:[], alias:{}, default:{}, examples:[] };		if (opts.alias) this.alias(opts.alias);		if (desc) this.describe(desc);
		return this;	}
	describe(str) {		this.tree[this.curr || DEF].describe = Array.isArray(str) ? str : $.sentences(str);		return this;	}
	alias(...names) {		if (this.single) throw new Error('Cannot call `alias()` in "single" mode');		if (!this.curr) throw new Error('Cannot call `alias()` before defining a command');		let arr = this.tree[this.curr].alibi = this.tree[this.curr].alibi.concat(...names);		arr.forEach(key => this.tree[key] = this.curr);		return this;	}
	option(str, desc, val) {		let cmd = this.tree[ this.curr || ALL ];
		let [flag, alias] = $.parse(str);		if (alias && alias.length > 1) [flag, alias]=[alias, flag];
		str = `--${flag}`;		if (alias && alias.length > 0) {			str = `-${alias}, ${str}`;			let old = cmd.alias[alias];			cmd.alias[alias] = (old || []).concat(flag);		}
		let arr = [str, desc || ''];
		if (val !== void 0) {			arr.push(val);			cmd.default[flag] = val;		} else if (!alias) {			cmd.default[flag] = void 0;		}
		cmd.options.push(arr);		return this;	}
	action(handler) {		this.tree[ this.curr || DEF ].handler = handler;		return this;	}
	example(str) {		this.tree[ this.curr || DEF ].examples.push(str);		return this;	}
	version(str) {		this.ver = str;		return this;	}
	parse(arr, opts={}) {		arr = arr.slice(); // copy		let offset=2, tmp, idx, isVoid, cmd;		let alias = { h:'help', v:'version' };		let argv = mri(arr.slice(offset), { alias });		let isSingle = this.single;		let bin = this.bin;		let name = '';
		if (isSingle) {			cmd = this.tree[DEF];		} else {			// Loop thru possible command(s)			let i=1, xyz, len=argv._.length + 1;			for (; i < len; i++) {				tmp = argv._.slice(0, i).join(' ');				xyz = this.tree[tmp];				if (typeof xyz === 'string') {					idx = (name=xyz).split(' ');					arr.splice(arr.indexOf(argv._[0]), i, ...idx);					i += (idx.length - i);				} else if (xyz) {					name = tmp;				} else if (name) {					break;				}			}
			cmd = this.tree[name];			isVoid = (cmd === void 0);
			if (isVoid) {				if (this.default) {					name = this.default;					cmd = this.tree[name];					arr.unshift(name);					offset++;				} else if (tmp) {					return $.error(bin, `Invalid command: ${tmp}`);				} //=> else: cmd not specified, wait for now...			}		}
		// show main help if relied on "default" for multi-cmd		if (argv.help) return this.help(!isSingle && !isVoid && name);		if (argv.version) return this._version();
		if (!isSingle && cmd === void 0) {			return $.error(bin, 'No command specified.');		}
		let all = this.tree[ALL];		// merge all objects :: params > command > all		opts.alias = Object.assign(all.alias, cmd.alias, opts.alias);		opts.default = Object.assign(all.default, cmd.default, opts.default);
		tmp = name.split(' ');		idx = arr.indexOf(tmp[0], 2);		if (!!~idx) arr.splice(idx, tmp.length);
		let vals = mri(arr.slice(offset), opts);		if (!vals || typeof vals === 'string') {			return $.error(bin, vals || 'Parsed unknown option flag(s)!');		}
		let segs = cmd.usage.split(/\s+/);		let reqs = segs.filter(x => x.charAt(0)==='<');		let args = vals._.splice(0, reqs.length);
		if (args.length < reqs.length) {			if (name) bin += ` ${name}`; // for help text			return $.error(bin, 'Insufficient arguments!');		}
		segs.filter(x => x.charAt(0)==='[').forEach(_ => {			args.push(vals._.shift()); // adds `undefined` per [slot] if no more		});
		args.push(vals); // flags & co are last		let handler = cmd.handler;		return opts.lazy ? { args, name, handler } : handler.apply(null, args);	}
	help(str) {		console.log(			$.help(this.bin, this.tree, str || DEF, this.single)		);	}
	_version() {		console.log(`${this.bin}, ${this.ver}`);	}}
export default (str, isOne) => new Sade(str, isOne);