#!/usr/bin/env julia

# Copyright 2017 Stephen L. Smith and Frank Imeson
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

using GLNS

"""
Optional Flags -- values are given in square brackets []  
	-max_time=[Int]				 (default set by mode)
	-trials=[Int]				 (default set by mode)
	-restarts=[Int]              (default set by mode)
	-mode=[default, fast, slow]  (default is default)
	-verbose=[0, 1, 2, 3]        (default is 3.  0 is no output, 2 is most verbose)
	-output=[filename]           (default is output.tour)
	-epsilon=[Float in [0,1]]	 (default is 0.5)
	-reopt=[Float in [0,1]]      (default is set by mode)
"""
function parse_cmd(ARGS)
	if isempty(ARGS)
		println("no input instance given")
		exit(0)
	end
	if ARGS[1] == "-help" || ARGS[1] == "--help"
		println("Usage:  GTSPcmd.jl [filename] [optional flags]\n")
		println("Optional flags (vales are give in square brackets) :\n")
		println("-mode=[default, fast, slow]      (default is default)")
		println("-max_time=[Int]                  (default set by mode)")
		println("-trials=[Int]                    (default set by mode)")
		println("-restarts=[Int]                  (default set by mode)")
		println("-noise=[None, Both, Subset, Add] (default is Both)")
		println("-num_iterations=[Int]            (default set by mode. Number multiplied by # of sets)")
		println("-verbose=[0, 1, 2, 3]            (default is 3. 0 is no output, 3 is most.)")
		println("-output=[filename]               (default is None)")
		println("-epsilon=[Float in [0,1]]        (default is 0.5)")
		println("-reopt=[Float in [0,1]]          (default is 1.0)")
		println("-budget=[Int]                    (default has no budget)")
		exit(0)
	end
	int_flags = ["-max_time", "-trials", "-restarts", "-verbose", "-budget", "-num_iterations"]
	float_flags = ["-epsilon", "-reopt"]
	string_flags = ["-mode", "-output", "-noise", "-devel"]
	filename = ""
	optional_args = Dict{Symbol, Any}()
	for arg in ARGS
		temp = split(arg, "=")
		if length(temp) == 1 && filename == ""
			filename = temp[1]
		elseif length(temp) == 2
			flag = temp[1]
			value = temp[2]
			if flag in int_flags
				key = Symbol(flag[2:end])
				optional_args[key] = parse(Int64, value)
			elseif flag in float_flags
				key = Symbol(flag[2:end])
				optional_args[key] = parse(Float64, value)
			elseif flag in string_flags
				key = Symbol(flag[2:end])
				optional_args[key] = value
			else
				println("WARNING: skipping unknown flag ", flag, " in command line arguments")
			end
		else
			error("argument ", arg, " not in proper format")
		end
	end
	if !isfile(filename)
		println("the problem instance  ", filename, " does not exist")
		exit(0)
	end
	return filename, optional_args
end


# running the code on the problem instance passed in via command line args.
problem_instance, optional_args = parse_cmd(ARGS)
GLNS.solver(problem_instance; optional_args...)