// ⚡️ Fiber is an Express inspired web framework written in Go with ☕️
// 🤖 Github Repository: https://github.com/gofiber/fiber
// 📌 API Documentation: https://docs.gofiber.io

package utils

import (
	"mime"
	"strings"

	casestrings "github.com/gofiber/utils/v2/strings"
)

const MIMEOctetStream = "application/octet-stream"
const (
	contentTypeApplicationJSON            = "application/json"
	contentTypeApplicationXML             = "application/xml"
	contentTypeApplicationFormURLEncoded  = "application/x-www-form-urlencoded"
	contentTypePrefixApplicationWithSlash = "application/"
)

// GetMIME returns the content-type of a file extension
func GetMIME(extension string) string {
	if len(extension) == 0 {
		return ""
	}

	// Normalize extension once at the start to avoid repeated checks
	var extWithoutDot string
	var extWithDot string
	if extension[0] == '.' {
		extWithoutDot = extension[1:]
		extWithDot = extension
	} else {
		extWithoutDot = extension
		extWithDot = "." + extension
	}

	// Single map lookup with normalized key
	if foundMime := mimeExtensions[extWithoutDot]; len(foundMime) > 0 {
		return foundMime
	}

	// Fallback to mime package with pre-computed extension
	if foundMime := mime.TypeByExtension(extWithDot); foundMime != "" {
		return foundMime
	}

	return MIMEOctetStream
}

// ParseVendorSpecificContentType check if content type is vendor specific and
// if it is parsable to any known types. If its not vendor specific then returns
// the original content type.
func ParseVendorSpecificContentType(cType string, caseInsensitive ...bool) string {
	useLower := len(caseInsensitive) > 0 && caseInsensitive[0]

	working := cType
	if useLower {
		// Content types are case-insensitive. Normalize if requested using the
		// strings.ToLower function to avoid allocations when possible.
		working = casestrings.ToLower(cType)
	}
	plusIndex := strings.IndexByte(working, '+')

	if plusIndex == -1 {
		return cType
	}

	var parsableType string
	if semiColonIndex := strings.IndexByte(working, ';'); semiColonIndex == -1 {
		parsableType = working[plusIndex+1:]
	} else if plusIndex < semiColonIndex {
		parsableType = working[plusIndex+1 : semiColonIndex]
	} else {
		return cType[:semiColonIndex]
	}

	slashIndex := strings.IndexByte(working, '/')

	if slashIndex == -1 {
		return cType
	}

	if strings.HasPrefix(working, contentTypePrefixApplicationWithSlash) {
		switch parsableType {
		case "json":
			return contentTypeApplicationJSON
		case "xml":
			return contentTypeApplicationXML
		case "x-www-form-urlencoded":
			return contentTypeApplicationFormURLEncoded
		}
	}

	return working[:slashIndex+1] + parsableType
}

// limits for HTTP statuscodes
const (
	statusMessageMin = 100
	statusMessageMax = 511
)

// StatusMessage returns the correct message for the provided HTTP statuscode
func StatusMessage(status int) string {
	if status < statusMessageMin || status > statusMessageMax {
		return ""
	}
	return statusMessage[status]
}

// NOTE: Keep this in sync with fiber's status code list
var statusMessage = []string{
	100: "Continue",            // StatusContinue
	101: "Switching Protocols", // StatusSwitchingProtocols
	102: "Processing",          // StatusProcessing
	103: "Early Hints",         // StatusEarlyHints

	200: "OK",                            // StatusOK
	201: "Created",                       // StatusCreated
	202: "Accepted",                      // StatusAccepted
	203: "Non-Authoritative Information", // StatusNonAuthoritativeInformation
	204: "No Content",                    // StatusNoContent
	205: "Reset Content",                 // StatusResetContent
	206: "Partial Content",               // StatusPartialContent
	207: "Multi-Status",                  // StatusMultiStatus
	208: "Already Reported",              // StatusAlreadyReported
	226: "IM Used",                       // StatusIMUsed

	300: "Multiple Choices",   // StatusMultipleChoices
	301: "Moved Permanently",  // StatusMovedPermanently
	302: "Found",              // StatusFound
	303: "See Other",          // StatusSeeOther
	304: "Not Modified",       // StatusNotModified
	305: "Use Proxy",          // StatusUseProxy
	306: "Switch Proxy",       // StatusSwitchProxy
	307: "Temporary Redirect", // StatusTemporaryRedirect
	308: "Permanent Redirect", // StatusPermanentRedirect

	400: "Bad Request",                     // StatusBadRequest
	401: "Unauthorized",                    // StatusUnauthorized
	402: "Payment Required",                // StatusPaymentRequired
	403: "Forbidden",                       // StatusForbidden
	404: "Not Found",                       // StatusNotFound
	405: "Method Not Allowed",              // StatusMethodNotAllowed
	406: "Not Acceptable",                  // StatusNotAcceptable
	407: "Proxy Authentication Required",   // StatusProxyAuthRequired
	408: "Request Timeout",                 // StatusRequestTimeout
	409: "Conflict",                        // StatusConflict
	410: "Gone",                            // StatusGone
	411: "Length Required",                 // StatusLengthRequired
	412: "Precondition Failed",             // StatusPreconditionFailed
	413: "Request Entity Too Large",        // StatusRequestEntityTooLarge
	414: "Request URI Too Long",            // StatusRequestURITooLong
	415: "Unsupported Media Type",          // StatusUnsupportedMediaType
	416: "Requested Range Not Satisfiable", // StatusRequestedRangeNotSatisfiable
	417: "Expectation Failed",              // StatusExpectationFailed
	418: "I'm a teapot",                    // StatusTeapot
	421: "Misdirected Request",             // StatusMisdirectedRequest
	422: "Unprocessable Entity",            // StatusUnprocessableEntity
	423: "Locked",                          // StatusLocked
	424: "Failed Dependency",               // StatusFailedDependency
	425: "Too Early",                       // StatusTooEarly
	426: "Upgrade Required",                // StatusUpgradeRequired
	428: "Precondition Required",           // StatusPreconditionRequired
	429: "Too Many Requests",               // StatusTooManyRequests
	431: "Request Header Fields Too Large", // StatusRequestHeaderFieldsTooLarge
	451: "Unavailable For Legal Reasons",   // StatusUnavailableForLegalReasons

	500: "Internal Server Error",           // StatusInternalServerError
	501: "Not Implemented",                 // StatusNotImplemented
	502: "Bad Gateway",                     // StatusBadGateway
	503: "Service Unavailable",             // StatusServiceUnavailable
	504: "Gateway Timeout",                 // StatusGatewayTimeout
	505: "HTTP Version Not Supported",      // StatusHTTPVersionNotSupported
	506: "Variant Also Negotiates",         // StatusVariantAlsoNegotiates
	507: "Insufficient Storage",            // StatusInsufficientStorage
	508: "Loop Detected",                   // StatusLoopDetected
	510: "Not Extended",                    // StatusNotExtended
	511: "Network Authentication Required", // StatusNetworkAuthenticationRequired
}

// MIME types were copied from https://github.com/nginx/nginx/blob/67d2a9541826ecd5db97d604f23460210fd3e517/conf/mime.types with the following updates:
// - Use "application/xml" instead of "text/xml" as recommended per https://datatracker.ietf.org/doc/html/rfc7303#section-4.1
// - Use "text/javascript" instead of "application/javascript" as recommended per https://www.rfc-editor.org/rfc/rfc9239#name-text-javascript
// - Use "application/vnd.msgpack" from https://www.iana.org/assignments/media-types/application/vnd.msgpack
var mimeExtensions = map[string]string{
	"html":    "text/html",
	"htm":     "text/html",
	"shtml":   "text/html",
	"css":     "text/css",
	"xml":     "application/xml",
	"cbor":    "application/cbor",
	"gif":     "image/gif",
	"jpeg":    "image/jpeg",
	"jpg":     "image/jpeg",
	"js":      "text/javascript",
	"atom":    "application/atom+xml",
	"rss":     "application/rss+xml",
	"mml":     "text/mathml",
	"txt":     "text/plain",
	"jad":     "text/vnd.sun.j2me.app-descriptor",
	"wml":     "text/vnd.wap.wml",
	"htc":     "text/x-component",
	"avif":    "image/avif",
	"png":     "image/png",
	"svg":     "image/svg+xml",
	"svgz":    "image/svg+xml",
	"tif":     "image/tiff",
	"tiff":    "image/tiff",
	"wbmp":    "image/vnd.wap.wbmp",
	"webp":    "image/webp",
	"ico":     "image/x-icon",
	"jng":     "image/x-jng",
	"bmp":     "image/x-ms-bmp",
	"woff":    "font/woff",
	"woff2":   "font/woff2",
	"jar":     "application/java-archive",
	"war":     "application/java-archive",
	"ear":     "application/java-archive",
	"json":    "application/json",
	"msgpack": "application/vnd.msgpack",
	"hqx":     "application/mac-binhex40",
	"doc":     "application/msword",
	"pdf":     "application/pdf",
	"ps":      "application/postscript",
	"eps":     "application/postscript",
	"ai":      "application/postscript",
	"rtf":     "application/rtf",
	"m3u8":    "application/vnd.apple.mpegurl",
	"kml":     "application/vnd.google-earth.kml+xml",
	"kmz":     "application/vnd.google-earth.kmz",
	"xls":     "application/vnd.ms-excel",
	"eot":     "application/vnd.ms-fontobject",
	"ppt":     "application/vnd.ms-powerpoint",
	"odg":     "application/vnd.oasis.opendocument.graphics",
	"odp":     "application/vnd.oasis.opendocument.presentation",
	"ods":     "application/vnd.oasis.opendocument.spreadsheet",
	"odt":     "application/vnd.oasis.opendocument.text",
	"pptx":    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
	"xlsx":    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
	"docx":    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
	"wmlc":    "application/vnd.wap.wmlc",
	"wasm":    "application/wasm",
	"7z":      "application/x-7z-compressed",
	"cco":     "application/x-cocoa",
	"jardiff": "application/x-java-archive-diff",
	"jnlp":    "application/x-java-jnlp-file",
	"run":     "application/x-makeself",
	"pl":      "application/x-perl",
	"pm":      "application/x-perl",
	"prc":     "application/x-pilot",
	"pdb":     "application/x-pilot",
	"rar":     "application/x-rar-compressed",
	"rpm":     "application/x-redhat-package-manager",
	"sea":     "application/x-sea",
	"swf":     "application/x-shockwave-flash",
	"sit":     "application/x-stuffit",
	"tcl":     "application/x-tcl",
	"tk":      "application/x-tcl",
	"der":     "application/x-x509-ca-cert",
	"pem":     "application/x-x509-ca-cert",
	"crt":     "application/x-x509-ca-cert",
	"xpi":     "application/x-xpinstall",
	"xhtml":   "application/xhtml+xml",
	"xspf":    "application/xspf+xml",
	"zip":     "application/zip",
	"zst":     "application/zstd",
	"bin":     "application/octet-stream",
	"exe":     "application/octet-stream",
	"dll":     "application/octet-stream",
	"deb":     "application/octet-stream",
	"dmg":     "application/octet-stream",
	"iso":     "application/octet-stream",
	"img":     "application/octet-stream",
	"msi":     "application/octet-stream",
	"msp":     "application/octet-stream",
	"msm":     "application/octet-stream",
	"mid":     "audio/midi",
	"midi":    "audio/midi",
	"kar":     "audio/midi",
	"mp3":     "audio/mpeg",
	"ogg":     "audio/ogg",
	"m4a":     "audio/x-m4a",
	"ra":      "audio/x-realaudio",
	"3gpp":    "video/3gpp",
	"3gp":     "video/3gpp",
	"ts":      "video/mp2t",
	"mp4":     "video/mp4",
	"mpeg":    "video/mpeg",
	"mpg":     "video/mpeg",
	"mov":     "video/quicktime",
	"webm":    "video/webm",
	"flv":     "video/x-flv",
	"m4v":     "video/x-m4v",
	"mng":     "video/x-mng",
	"asx":     "video/x-ms-asf",
	"asf":     "video/x-ms-asf",
	"wmv":     "video/x-ms-wmv",
	"avi":     "video/x-msvideo",
}
