/**
License:
    Boost Software License - Version 1.0 - August 17th, 2003

    Permission is hereby granted, free of charge, to any person or organization
    obtaining a copy of the software and accompanying documentation covered by
    this license (the "Software") to use, reproduce, display, distribute,
    execute, and transmit the Software, and to prepare derivative works of the
    Software, and to permit third-parties to whom the Software is furnished to
    do so, all subject to the following:

    The copyright notices in the Software and this entire statement, including
    the above license grant, this restriction and the following disclaimer,
    must be included in all copies of the Software, in whole or in part, and
    all derivative works of the Software, unless such copies or derivative
    works are solely in the form of machine-executable object code generated by
    a source language processor.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
    SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
    FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.

Authors:
    Alexandru Ermicioi
**/
module aermicioi.aedi_property_reader.arg.convertor;

import std.algorithm;
import std.array;
import std.conv;
import std.exception;
import std.getopt;
import std.range;
import std..string;
import std.traits;
import std.experimental.allocator;
import aermicioi.aedi.configurer.annotation.annotation;
import aermicioi.aedi_property_reader.arg.accessor;
import aermicioi.aedi_property_reader.arg.inspector;
import aermicioi.aedi_property_reader.convertor.accessor;
import aermicioi.aedi_property_reader.convertor.convertor;
import aermicioi.aedi_property_reader.convertor.exception;
import aermicioi.aedi_property_reader.convertor.inspector;
import aermicioi.aedi_property_reader.convertor.placeholder;
import aermicioi.aedi_property_reader.convertor.setter;

/**
Converts command line arguments in string[] to string[string] format.

Converted associative array (aa) will contain each argument by it's position as a key.
Compound arguments of form --key=value will be split, and available as key -> value pair
in aa, furthermore if following sequence is encountered --key value, it will be treated as
previous construct, and registered in aa as well. Single dashed arguments will be treated all
as single bool flags, i.e. -uni will expand into --u=true --n=true --i=true and be registered
in by value arguments.
**/
@component
class ArgumentArrayToAssociativeArray : Convertor {

    mixin ConvertsFromToMixin!(string[], ArgumentsHolder);
    mixin EqualToHashToStringOpCmpMixin;

    /**
    Convert from component to component.

    Params:
        from = original component that is to be converted.
        to = destination object that will be constructed out for original one.
        allocator = optional allocator that could be used to construct to component.
    Throws:
        ConvertorException when there is a converting error
        InvalidArgumentException when arguments passed are not of right type or state
    Returns:
        Resulting converted component.
    **/
    Object convert(in Object from, const TypeInfo to, RCIAllocator allocator = theAllocator) const {
        enforce!ConvertorException(this.converts(from, to), text(
            "Cannot convert component ", from.identify, " to ", to, " expected original component of ", this.from, " and destination of ", this.to
        ));
        import std.algorithm;
        import std.range;
        import std.conv : to;

        ArgumentsHolder argumentsHolder;
        string[] original = from.unwrap!(string[]);
        argumentsHolder.byValue = original;

        foreach (index, element; original) {
            string argument, key, value;
            this.processDoubleDash(original[index .. $], element, argument, key, value);

            if (argument !is null) {
                if ((key in argumentsHolder.byKeyValues) || (key in argumentsHolder.byKeyValue)) {
                    if (key in argumentsHolder.byKeyValue) {
                        argumentsHolder.byKeyValues[key] ~= argumentsHolder.byKeyValue[key];
                        argumentsHolder.byKeyValue.remove(key);
                    }

                    argumentsHolder.byKeyValues[key] ~= value;
                } else {
                    argumentsHolder.byKeyValue[key] = value;
                }
            } else {
                this.processSingleDash(element, argumentsHolder.byKeyValue);
            }

        }

        return argumentsHolder.pack(from, this, allocator);
    }

    /**
    Destroy component created using this convertor.

    Destroy component created using this convertor.
    Since convertor could potentially allocate memory for
    converted component, only itself is containing history of allocation,
    and therefore it is responsible as well to destroy and free allocated
    memory with allocator.

    Params:
        converted = component that should be destroyed.
        allocator = allocator used to allocate converted component.
    Return:
        true if component is destroyed, false otherwise
    **/
    void destruct(const TypeInfo from, ref Object converted, RCIAllocator allocator = theAllocator) const {
        enforce!ConvertorException(this.destroys(from, converted), text(
            "Cannot destroy component ", to.identify, ". Passed component isn't converted by this convertor"
        ));

        converted.unpack!(string[string])(allocator);
    }

    private void processDoubleDash(string[] remainingArguments, string unprocessed, out string argument, out string key, out string value) const {
        if (unprocessed.startsWith("--")) {
            argument = unprocessed.stripLeft('-');
            ptrdiff_t pointcut = argument.indexOf('=');

            if (pointcut != -1) {
                key = argument[0 .. pointcut];
                value = argument[pointcut + 1 .. $];
            } else if ((remainingArguments.length > 1) && (!remainingArguments[1].startsWith('-'))) {
                key = argument;
                value = remainingArguments[1];
            } else {
                key = argument;
                value = "true";
            }
        }
    }

    private void processSingleDash(string unprocessed, string[string] array) const {
        import std.uni : isAlpha;
        import std.algorithm;
        import std.utf : byDchar;

        if (unprocessed.startsWith("-")) {
            string argument = unprocessed.stripLeft('-');

            if (argument.byDchar.all!(dch => dch.isAlpha)) {
                foreach (index, dch; argument) {
                    array[argument[index .. index + 1]] = "true";
                }
            }
        }
    }
}