module mimetypes;

import std.csv;
import std.traits;

string[string] mimeTypes;

static this()
{
	mimeTypes = mimeMapping!("mimetypes.csv");
}

template mimeMapping(string csvFile, T = string[string])
if (isAssociativeArray!T)
{
	enum mimeMapping = makeMimeMapping!(import(csvFile), T);
}

private T
makeMimeMapping(string csv, T)()
if (isAssociativeArray!T)
{
	T result;

	foreach (record; csvReader!T(csv, null)) {
		result[record["Extension"]] = record["Type"];
	}

	return result;
}

string
mimeType(string fileName) @safe
{
	import std.path : extension;
	import std.uni  : toLower;

	string ext;

	ext = fileName.extension();
	if (!ext)
		return "application/octet-stream";

	ext = ext[1 .. $].toLower();
	return mimeTypes[ext];
}