package publish

import "strings"

func guessMimeType(ext string) (string, string) {
	if ext == "" {
		return "application/octet-stream", "binary"
	}

	ext = strings.ToLower(strings.TrimLeft(strings.TrimSpace(ext), "."))

	types := map[string]struct{ mime, t string }{
		"a":        {"application/octet-stream", "binary"},
		"ai":       {"application/postscript", "image"},
		"aif":      {"audio/x-aiff", "audio"},
		"aifc":     {"audio/x-aiff", "audio"},
		"aiff":     {"audio/x-aiff", "audio"},
		"au":       {"audio/basic", "audio"},
		"avi":      {"video/x-msvideo", "video"},
		"bat":      {"text/plain", "document"},
		"bcpio":    {"application/x-bcpio", "binary"},
		"bin":      {"application/octet-stream", "binary"},
		"bmp":      {"image/bmp", "image"},
		"c":        {"text/plain", "document"},
		"cdf":      {"application/x-netcdf", "binary"},
		"cpio":     {"application/x-cpio", "binary"},
		"csh":      {"application/x-csh", "binary"},
		"css":      {"text/css", "document"},
		"csv":      {"text/csv", "document"},
		"dll":      {"application/octet-stream", "binary"},
		"doc":      {"application/msword", "document"},
		"dot":      {"application/msword", "document"},
		"dvi":      {"application/x-dvi", "binary"},
		"eml":      {"message/rfc822", "document"},
		"eps":      {"application/postscript", "document"},
		"epub":     {"application/epub+zip", "document"},
		"etx":      {"text/x-setext", "document"},
		"exe":      {"application/octet-stream", "binary"},
		"gif":      {"image/gif", "image"},
		"gtar":     {"application/x-gtar", "binary"},
		"h":        {"text/plain", "document"},
		"hdf":      {"application/x-hdf", "binary"},
		"htm":      {"text/html", "document"},
		"html":     {"text/html", "document"},
		"ico":      {"image/vnd.microsoft.icon", "image"},
		"ief":      {"image/ief", "image"},
		"iges":     {"model/iges", "model"},
		"jpe":      {"image/jpeg", "image"},
		"jpeg":     {"image/jpeg", "image"},
		"jpg":      {"image/jpeg", "image"},
		"js":       {"application/javascript", "document"},
		"json":     {"application/json", "document"},
		"ksh":      {"text/plain", "document"},
		"latex":    {"application/x-latex", "binary"},
		"m1v":      {"video/mpeg", "video"},
		"m3u":      {"application/vnd.apple.mpegurl", "audio"},
		"m3u8":     {"application/vnd.apple.mpegurl", "audio"},
		"man":      {"application/x-troff-man", "document"},
		"markdown": {"text/markdown", "document"},
		"md":       {"text/markdown", "document"},
		"me":       {"application/x-troff-me", "binary"},
		"mht":      {"message/rfc822", "document"},
		"mhtml":    {"message/rfc822", "document"},
		"mif":      {"application/x-mif", "binary"},
		"mov":      {"video/quicktime", "video"},
		"movie":    {"video/x-sgi-movie", "video"},
		"mp2":      {"audio/mpeg", "audio"},
		"mp3":      {"audio/mpeg", "audio"},
		"mp4":      {"video/mp4", "video"},
		"mpa":      {"video/mpeg", "video"},
		"mpe":      {"video/mpeg", "video"},
		"mpeg":     {"video/mpeg", "video"},
		"mpg":      {"video/mpeg", "video"},
		"ms":       {"application/x-troff-ms", "binary"},
		"nc":       {"application/x-netcdf", "binary"},
		"nws":      {"message/rfc822", "document"},
		"o":        {"application/octet-stream", "binary"},
		"obj":      {"application/octet-stream", "model"},
		"oda":      {"application/oda", "binary"},
		"p12":      {"application/x-pkcs12", "binary"},
		"p7c":      {"application/pkcs7-mime", "binary"},
		"pbm":      {"image/x-portable-bitmap", "image"},
		"pdf":      {"application/pdf", "document"},
		"pfx":      {"application/x-pkcs12", "binary"},
		"pgm":      {"image/x-portable-graymap", "image"},
		"pl":       {"text/plain", "document"},
		"png":      {"image/png", "image"},
		"pnm":      {"image/x-portable-anymap", "image"},
		"pot":      {"application/vnd.ms-powerpoint", "document"},
		"ppa":      {"application/vnd.ms-powerpoint", "document"},
		"ppm":      {"image/x-portable-pixmap", "image"},
		"pps":      {"application/vnd.ms-powerpoint", "document"},
		"ppt":      {"application/vnd.ms-powerpoint", "document"},
		"ps":       {"application/postscript", "document"},
		"pwz":      {"application/vnd.ms-powerpoint", "document"},
		"py":       {"text/x-python", "document"},
		"pyc":      {"application/x-python-code", "binary"},
		"pyo":      {"application/x-python-code", "binary"},
		"qt":       {"video/quicktime", "video"},
		"ra":       {"audio/x-pn-realaudio", "audio"},
		"ram":      {"application/x-pn-realaudio", "audio"},
		"ras":      {"image/x-cmu-raster", "image"},
		"rdf":      {"application/xml", "binary"},
		"rgb":      {"image/x-rgb", "image"},
		"roff":     {"application/x-troff", "binary"},
		"rtx":      {"text/richtext", "document"},
		"sgm":      {"text/x-sgml", "document"},
		"sgml":     {"text/x-sgml", "document"},
		"sh":       {"application/x-sh", "document"},
		"shar":     {"application/x-shar", "binary"},
		"snd":      {"audio/basic", "audio"},
		"so":       {"application/octet-stream", "binary"},
		"src":      {"application/x-wais-source", "binary"},
		"stl":      {"model/stl", "model"},
		"sv4cpio":  {"application/x-sv4cpio", "binary"},
		"sv4crc":   {"application/x-sv4crc", "binary"},
		"svg":      {"image/svg+xml", "image"},
		"swf":      {"application/x-shockwave-flash", "binary"},
		"t":        {"application/x-troff", "binary"},
		"tar":      {"application/x-tar", "binary"},
		"tcl":      {"application/x-tcl", "binary"},
		"tex":      {"application/x-tex", "binary"},
		"texi":     {"application/x-texinfo", "binary"},
		"texinfo":  {"application/x-texinfo", "binary"},
		"tif":      {"image/tiff", "image"},
		"tiff":     {"image/tiff", "image"},
		"tr":       {"application/x-troff", "binary"},
		"tsv":      {"text/tab-separated-values", "document"},
		"txt":      {"text/plain", "document"},
		"ustar":    {"application/x-ustar", "binary"},
		"vcf":      {"text/x-vcard", "document"},
		"wav":      {"audio/x-wav", "audio"},
		"webm":     {"video/webm", "video"},
		"wiz":      {"application/msword", "document"},
		"wsdl":     {"application/xml", "document"},
		"xbm":      {"image/x-xbitmap", "image"},
		"xlb":      {"application/vnd.ms-excel", "document"},
		"xls":      {"application/vnd.ms-excel", "document"},
		"xml":      {"text/xml", "document"},
		"xpdl":     {"application/xml", "document"},
		"xpm":      {"image/x-xpixmap", "image"},
		"xsl":      {"application/xml", "document"},
		"xwd":      {"image/x-xwindowdump", "image"},
		"zip":      {"application/zip", "binary"},

		// These are non-standard types, commonly found in the wild.
		"cbr":  {"application/vnd.comicbook-rar", "document"},
		"cbz":  {"application/vnd.comicbook+zip", "document"},
		"flac": {"audio/flac", "audio"},
		"lbry": {"application/x-ext-lbry", "document"},
		"m4v":  {"video/m4v", "video"},
		"mid":  {"audio/midi", "audio"},
		"midi": {"audio/midi", "audio"},
		"mkv":  {"video/x-matroska", "video"},
		"mobi": {"application/x-mobipocket-ebook", "document"},
		"oga":  {"audio/ogg", "audio"},
		"ogv":  {"video/ogg", "video"},
		"pct":  {"image/pict", "image"},
		"pic":  {"image/pict", "image"},
		"pict": {"image/pict", "image"},
		"prc":  {"application/x-mobipocket-ebook", "document"},
		"rtf":  {"application/rtf", "document"},
		"xul":  {"text/xul", "document"},

		// microsoft is special and has its own "standard"
		// https://docs.microsoft.com/en-us/windows/desktop/wmp/file-name-extensions
		"wmv": {"video/x-ms-wmv", "video"},
	}

	if data, ok := types[ext]; ok {
		return data.mime, data.t
	}
	return "application/x-ext-" + ext, "binary"
}