if(!Array.prototype.includes) {
	Array.prototype.includes = function(v) {
		for(var i = 0; i < this.length; i++) {
			if(this[i] == v) return true;
		}

		return false;
	};
}

if(!Array.prototype.flat) {
	Array.prototype.flat = function() {
		const flat = function(acc, cur) {
			return acc.concat(cur);
		};

		return this.reduce(flat, []);
	};
}

const pmake = {
	VERSION : "0.0",
	compilers : {},
	systems : {},
	options : {},
	options_category : {},
	projects : []
};

pmake.inherit = function(base, call) {
	const func = (function() {
		base.apply(this, arguments);

		if(call) call.apply(this, arguments);
	});

	Object.setPrototypeOf(func.prototype, base.prototype);

	return func;
};

pmake.inherited = function(base, parent) {
	var proto = base.prototype;

	while(proto) {
		if(proto == parent.prototype) return true;

		proto = Object.getPrototypeOf(proto);
	}

	return false;
};

pmake.register = function(target) {
	if(target instanceof pmake.Compiler) {
		pmake.compilers[target.target] = target;
	} else if(target instanceof pmake.System) {
		pmake.systems[target.target] = target;
	} else if(target instanceof pmake.Option) {
		if(!pmake.options_category[target.category]) pmake.options_category[target.category] = {};

		pmake.options_category[target.category][target.target] = target;
		pmake.options[target.target]			       = target;
	} else if(target instanceof pmake.Project) {
		pmake.projects.push(target);
	}
};

pmake.resolveProjects = function(arr, if_str) {
	var r = [];

	for(var i = 0; i < arr.length; i++) {
		var proj = arr[i];

		function filter_project(x) {
			return x.target == proj;
		}

		if((typeof proj) == "string" && pmake.projects.filter(filter_project)[0]) {
			proj = pmake.projects.filter(filter_project)[0];
		}

		if(proj instanceof pmake.Project) {
			r = r.concat(pmake.resolveProjects(proj.libraries, if_str));
			r.push(proj);
		} else if((typeof proj) == "string" && if_str) {
			r.push(if_str(proj));
		}
	}

	r = r.filter(function(item, pos) {
		return r.indexOf(item) == pos;
	});

	return r;
};

pmake.isCxx = function(src) {
	return src.endsWith(".cc") || src.endsWith(".cxx") || src.endsWith(".cpp");
};

pmake.pathTransform = function(target) {
	return function(x) {
		if(x.startsWith("/") || x.match(/^[A-Za-z]+:\//)) {
			return x;
		} else {
			return target.base + "/" + x;
		}
	};
};

pmake.includes = function(target) {
	function includes(x) {
		return x.includes.map(pmake.pathTransform(x));
	}

	const targets = pmake.resolveProjects(target.libraries);

	return target.includes.concat(targets.map(includes).flat());
};

pmake.libdirs = function(target) {
	function libdirs(x) {
		if(x instanceof pmake.LibraryProject) {
			return x.libdirs.map(pmake.pathTransform(x));
		}

		return [];
	}

	const targets = pmake.resolveProjects(target.libraries);

	return target.libdirs.concat(targets.map(libdirs).flat());
};

pmake.libs = function(target, if_str, nostr) {
	function libs(x) {
		if(x instanceof pmake.LibraryProject) {
			function recursion(x) {
				if(x instanceof pmake.LibraryProject) {
					return pmake.libs(x, if_str);
				} else if(!nostr && if_str) {
					return [ if_str(x) ];
				} else if(!nostr) {
					return [ x ];
				}
				return [];
			}

			const r = x.libraries.map(recursion).flat().concat([ x.base + "/" + pmake.compiler.output(x) ]);

			return r;
		} else if((typeof x) == "string" && !nostr) {
			return [ x ];
		}

		return [];
	}

	const targets = pmake.resolveProjects(target.libraries, if_str).map(libs).flat();

	targets = targets.filter(function(item, pos) {
		return targets.indexOf(item) == pos;
	});

	return targets;
};

pmake.setSystem = function(target) {
	pmake.system = pmake.systems[target];

	if(pmake.system.init) pmake.system.init();
};

pmake.setCompiler = function(target) {
	pmake.compiler = pmake.compilers[target];

	if(pmake.compiler.init) pmake.compiler.init();
};

(function() {
const Compiler = function() {
	this.prefix = "";
};

Compiler.prototype.init = function() {
};

Compiler.prototype.output = function(target) {
	if((typeof target) == "string") {
		if(target.endsWith(".c")) return target.replace(/\.c$/, ".o");
	} else if(target instanceof pmake.LibraryProject) {
		return "lib" + target.output + ".a";
	} else if(target instanceof pmake.ExecutableProject) {
		return target.output;
	}

	return target.output;
};

const POSIXCompiler = pmake.inherit(Compiler, function(target) {
	this.ar	 = "ar";
	this.cc	 = "cc";
	this.cxx = "c++";
});

POSIXCompiler.prototype.compile = function(target, obj, src) {
	function add_i(x) {
		return "-I" + x;
	}

	const includes = pmake.includes(target).map(add_i).join(" ");
	const flags    = includes + " -c -o " + obj + " " + src;

	if(src.endsWith(".c")) {
		return this.prefix + this.cc + " " + flags;
	} else if(is_cxx(src)) {
		return this.prefix + this.cxx + " " + flags;
	}

	return "";
};

POSIXCompiler.prototype.link = function(target, files) {
	if(target instanceof pmake.LibraryProject) {
		return this.prefix + this.ar + " rcs " + this.output(target) + " " + files.join(" ");
	} else if(target instanceof pmake.ExecutableProject) {
		var c	= "";
		var cxx = target.sources.filter(pmake.isCxx);
		if(!cxx || cxx.length == 0) {
			c = this.prefix + this.cc;
		} else {
			c = this.prefix + this.cxx;
		}

		function add_l(x) {
			return "-l" + x;
		}

		function add_L(x) {
			return "-L" + x;
		}

		return this.prefix + c + " " + pmake.libdirs(target).map(add_L).join(" ") + " -o " + this.output(target) + " " + files.join(" ") + " " + pmake.libs(target, add_l).join(" ");
	}

	return "";
}

const System = function() {};

System.prototype.init = function() {
};

const Option = function(cmd) {
	if(cmd) {
		const c = cmd.split("=");

		this.target = c[0];
		this.option = c[1];
	}
};

const Project = function(target) {
	this.target    = target;
	this.sources   = [];
	this.includes  = [];
	this.libdirs   = [];
	this.libraries = [];
	this.output    = target;
	this.base      = fs.cwd();

	if(this.base == fs.startedCwd) {
		this.base = ".";
	} else {
		this.base = this.base.substr(fs.startedCwd.length + 1);
	}
};

Project.prototype.generate = function() {
};

const LibraryProject = pmake.inherit(Project, function(target) {
});

const ExecutableProject = pmake.inherit(Project, function(target) {
});

const InterfaceProject = pmake.inherit(Project, function(target) {
});

const File = function(filename, mode) {
	this.fp = fs.open(filename, mode);
};

File.prototype.write = function(string) {
	fs.write(this.fp, string);
};

File.prototype.close = function() {
	fs.close(this.fp);
};

pmake.Compiler		= Compiler;
pmake.POSIXCompiler	= POSIXCompiler;
pmake.System		= System;
pmake.Option		= Option;
pmake.Project		= Project;
pmake.LibraryProject	= LibraryProject;
pmake.ExecutableProject = ExecutableProject;
pmake.InterfaceProject	= InterfaceProject;
pmake.File		= File;
})();

/*** Option ***/
(function() {
const Compiler	     = new pmake.Option("compiler=VALUE");
Compiler.category    = "General";
Compiler.description = "Choose a compiler set; one of:";

Compiler.options = function() {
	return Object.keys(pmake.compilers);
};

Compiler.action = function(value) {
	pmake.setCompiler(value);
};

const System	   = new pmake.Option("system=VALUE");
System.category	   = "General";
System.description = "Generate files for a different system; one of:";

System.options = function() {
	return Object.keys(pmake.systems);
};

System.action = function(value) {
	pmake.setSystem(value);
};

pmake.register(Compiler);
pmake.register(System);
})();