// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/**
 * Command line arguments parser based on
 * [minimist](https://github.com/substack/minimist).
 *
 * This module is browser compatible.
 *
 * @module
 */ import { assert } from "../_util/assert.ts";
const { hasOwn  } = Object;
function get(obj, key) {
    if (hasOwn(obj, key)) {
        return obj[key];
    }
}
function getForce(obj, key) {
    const v = get(obj, key);
    assert(v != null);
    return v;
}
function isNumber(x) {
    if (typeof x === "number") return true;
    if (/^0x[0-9a-f]+$/i.test(String(x))) return true;
    return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(String(x));
}
function hasKey(obj, keys) {
    let o = obj;
    keys.slice(0, -1).forEach((key)=>{
        o = get(o, key) ?? {};
    });
    const key = keys[keys.length - 1];
    return hasOwn(o, key);
}
/** Take a set of command line arguments, optionally with a set of options, and
 * return an object representing the flags found in the passed arguments.
 *
 * By default, any arguments starting with `-` or `--` are considered boolean
 * flags. If the argument name is followed by an equal sign (`=`) it is
 * considered a key-value pair. Any arguments which could not be parsed are
 * available in the `_` property of the returned object.
 *
 * ```ts
 * import { parse } from "./mod.ts";
 * const parsedArgs = parse(Deno.args);
 * ```
 *
 * ```ts
 * import { parse } from "./mod.ts";
 * const parsedArgs = parse(["--foo", "--bar=baz", "--no-qux", "./quux.txt"]);
 * // parsedArgs: { foo: true, bar: "baz", qux: false, _: ["./quux.txt"] }
 * ```
 */ export function parse(args, { "--": doubleDash = false , alias ={} , boolean =false , default: defaults = {} , stopEarly =false , string =[] , collect =[] , negatable =[] , unknown =(i)=>i  } = {}) {
    const flags = {
        bools: {},
        strings: {},
        unknownFn: unknown,
        allBools: false,
        collect: {},
        negatable: {}
    };
    if (boolean !== undefined) {
        if (typeof boolean === "boolean") {
            flags.allBools = !!boolean;
        } else {
            const booleanArgs = typeof boolean === "string" ? [
                boolean
            ] : boolean;
            for (const key of booleanArgs.filter(Boolean)){
                flags.bools[key] = true;
            }
        }
    }
    const aliases = {};
    if (alias !== undefined) {
        for(const key1 in alias){
            const val = getForce(alias, key1);
            if (typeof val === "string") {
                aliases[key1] = [
                    val
                ];
            } else {
                aliases[key1] = val;
            }
            for (const alias1 of getForce(aliases, key1)){
                aliases[alias1] = [
                    key1
                ].concat(aliases[key1].filter((y)=>alias1 !== y));
            }
        }
    }
    if (string !== undefined) {
        const stringArgs = typeof string === "string" ? [
            string
        ] : string;
        for (const key2 of stringArgs.filter(Boolean)){
            flags.strings[key2] = true;
            const alias2 = get(aliases, key2);
            if (alias2) {
                for (const al of alias2){
                    flags.strings[al] = true;
                }
            }
        }
    }
    if (collect !== undefined) {
        const collectArgs = typeof collect === "string" ? [
            collect
        ] : collect;
        for (const key3 of collectArgs.filter(Boolean)){
            flags.collect[key3] = true;
            const alias3 = get(aliases, key3);
            if (alias3) {
                for (const al1 of alias3){
                    flags.collect[al1] = true;
                }
            }
        }
    }
    if (negatable !== undefined) {
        const negatableArgs = typeof negatable === "string" ? [
            negatable
        ] : negatable;
        for (const key4 of negatableArgs.filter(Boolean)){
            flags.negatable[key4] = true;
            const alias4 = get(aliases, key4);
            if (alias4) {
                for (const al2 of alias4){
                    flags.negatable[al2] = true;
                }
            }
        }
    }
    const argv = {
        _: []
    };
    function argDefined(key, arg) {
        return flags.allBools && /^--[^=]+$/.test(arg) || get(flags.bools, key) || !!get(flags.strings, key) || !!get(aliases, key);
    }
    function setKey(obj, name, value, collect = true) {
        let o = obj;
        const keys = name.split(".");
        keys.slice(0, -1).forEach(function(key) {
            if (get(o, key) === undefined) {
                o[key] = {};
            }
            o = get(o, key);
        });
        const key = keys[keys.length - 1];
        const collectable = collect && !!get(flags.collect, name);
        if (!collectable) {
            o[key] = value;
        } else if (get(o, key) === undefined) {
            o[key] = [
                value
            ];
        } else if (Array.isArray(get(o, key))) {
            o[key].push(value);
        } else {
            o[key] = [
                get(o, key),
                value
            ];
        }
    }
    function setArg(key, val, arg = undefined, collect) {
        if (arg && flags.unknownFn && !argDefined(key, arg)) {
            if (flags.unknownFn(arg, key, val) === false) return;
        }
        const value = !get(flags.strings, key) && isNumber(val) ? Number(val) : val;
        setKey(argv, key, value, collect);
        const alias = get(aliases, key);
        if (alias) {
            for (const x of alias){
                setKey(argv, x, value, collect);
            }
        }
    }
    function aliasIsBoolean(key) {
        return getForce(aliases, key).some((x)=>typeof get(flags.bools, x) === "boolean");
    }
    let notFlags = [];
    // all args after "--" are not parsed
    if (args.includes("--")) {
        notFlags = args.slice(args.indexOf("--") + 1);
        args = args.slice(0, args.indexOf("--"));
    }
    for(let i = 0; i < args.length; i++){
        const arg = args[i];
        if (/^--.+=/.test(arg)) {
            const m = arg.match(/^--([^=]+)=(.*)$/s);
            assert(m != null);
            const [, key5, value] = m;
            if (flags.bools[key5]) {
                const booleanValue = value !== "false";
                setArg(key5, booleanValue, arg);
            } else {
                setArg(key5, value, arg);
            }
        } else if (/^--no-.+/.test(arg) && get(flags.negatable, arg.replace(/^--no-/, ""))) {
            const m1 = arg.match(/^--no-(.+)/);
            assert(m1 != null);
            setArg(m1[1], false, arg, false);
        } else if (/^--.+/.test(arg)) {
            const m2 = arg.match(/^--(.+)/);
            assert(m2 != null);
            const [, key6] = m2;
            const next = args[i + 1];
            if (next !== undefined && !/^-/.test(next) && !get(flags.bools, key6) && !flags.allBools && (get(aliases, key6) ? !aliasIsBoolean(key6) : true)) {
                setArg(key6, next, arg);
                i++;
            } else if (/^(true|false)$/.test(next)) {
                setArg(key6, next === "true", arg);
                i++;
            } else {
                setArg(key6, get(flags.strings, key6) ? "" : true, arg);
            }
        } else if (/^-[^-]+/.test(arg)) {
            const letters = arg.slice(1, -1).split("");
            let broken = false;
            for(let j = 0; j < letters.length; j++){
                const next1 = arg.slice(j + 2);
                if (next1 === "-") {
                    setArg(letters[j], next1, arg);
                    continue;
                }
                if (/[A-Za-z]/.test(letters[j]) && /=/.test(next1)) {
                    setArg(letters[j], next1.split(/=(.+)/)[1], arg);
                    broken = true;
                    break;
                }
                if (/[A-Za-z]/.test(letters[j]) && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next1)) {
                    setArg(letters[j], next1, arg);
                    broken = true;
                    break;
                }
                if (letters[j + 1] && letters[j + 1].match(/\W/)) {
                    setArg(letters[j], arg.slice(j + 2), arg);
                    broken = true;
                    break;
                } else {
                    setArg(letters[j], get(flags.strings, letters[j]) ? "" : true, arg);
                }
            }
            const [key7] = arg.slice(-1);
            if (!broken && key7 !== "-") {
                if (args[i + 1] && !/^(-|--)[^-]/.test(args[i + 1]) && !get(flags.bools, key7) && (get(aliases, key7) ? !aliasIsBoolean(key7) : true)) {
                    setArg(key7, args[i + 1], arg);
                    i++;
                } else if (args[i + 1] && /^(true|false)$/.test(args[i + 1])) {
                    setArg(key7, args[i + 1] === "true", arg);
                    i++;
                } else {
                    setArg(key7, get(flags.strings, key7) ? "" : true, arg);
                }
            }
        } else {
            if (!flags.unknownFn || flags.unknownFn(arg) !== false) {
                argv._.push(flags.strings["_"] ?? !isNumber(arg) ? arg : Number(arg));
            }
            if (stopEarly) {
                argv._.push(...args.slice(i + 1));
                break;
            }
        }
    }
    for (const [key8, value1] of Object.entries(defaults)){
        if (!hasKey(argv, key8.split("."))) {
            setKey(argv, key8, value1);
            if (aliases[key8]) {
                for (const x of aliases[key8]){
                    setKey(argv, x, value1);
                }
            }
        }
    }
    for (const key9 of Object.keys(flags.bools)){
        if (!hasKey(argv, key9.split("."))) {
            const value2 = get(flags.collect, key9) ? [] : false;
            setKey(argv, key9, value2, false);
        }
    }
    for (const key10 of Object.keys(flags.strings)){
        if (!hasKey(argv, key10.split(".")) && get(flags.collect, key10)) {
            setKey(argv, key10, [], false);
        }
    }
    if (doubleDash) {
        argv["--"] = [];
        for (const key11 of notFlags){
            argv["--"].push(key11);
        }
    } else {
        for (const key12 of notFlags){
            argv._.push(key12);
        }
    }
    return argv;
}
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