// 🚀 Fiber is an Express.js inspired web framework written in Go with 💖
// 📌 Please open an issue if you got suggestions or found a bug!
// 🖥 Links: https://github.com/gofiber/fiber, https://fiber.wiki

// 🦸 Not all heroes wear capes, thank you to some amazing people
// 💖 @valyala, @erikdubbelboer, @savsgio, @julienschmidt, @koddr

package fiber

import (
	"encoding/base64"
	"encoding/xml"
	"fmt"
	"mime"
	"mime/multipart"
	"strings"

	jsoniter "github.com/json-iterator/go"
	"github.com/valyala/fasthttp"
)

// Accepts : https://fiber.wiki/context#accepts
func (ctx *Ctx) Accepts(offers ...string) string {
	if len(offers) == 0 {
		return ""
	}
	h := ctx.Get(fasthttp.HeaderAccept)
	if h == "" {
		return offers[0]
	}

	specs := strings.Split(h, ",")
	for _, offer := range offers {
		mimetype := getType(offer)
		// if mimetype != "" {
		// 	mimetype = strings.Split(mimetype, ";")[0]
		// } else {
		// 	mimetype = offer
		// }
		for _, spec := range specs {
			spec = strings.TrimSpace(spec)
			if strings.HasPrefix(spec, "*/*") {
				return offer
			}

			if strings.HasPrefix(spec, mimetype) {
				return offer
			}

			if strings.Contains(spec, "/*") {
				if strings.HasPrefix(spec, strings.Split(mimetype, "/")[0]) {
					return offer
				}
			}
		}
	}
	return ""
}

// AcceptsCharsets : https://fiber.wiki/context#acceptscharsets
func (ctx *Ctx) AcceptsCharsets(offers ...string) string {
	if len(offers) == 0 {
		return ""
	}

	h := ctx.Get(fasthttp.HeaderAcceptCharset)
	if h == "" {
		return offers[0]
	}

	specs := strings.Split(h, ",")
	for _, offer := range offers {
		for _, spec := range specs {
			spec = strings.TrimSpace(spec)
			if strings.HasPrefix(spec, "*") {
				return offer
			}
			if strings.HasPrefix(spec, offer) {
				return offer
			}
		}
	}
	return ""
}

// AcceptsEncodings : https://fiber.wiki/context#acceptsencodings
func (ctx *Ctx) AcceptsEncodings(offers ...string) string {
	if len(offers) == 0 {
		return ""
	}

	h := ctx.Get(fasthttp.HeaderAcceptEncoding)
	if h == "" {
		return offers[0]
	}

	specs := strings.Split(h, ",")
	for _, offer := range offers {
		for _, spec := range specs {
			spec = strings.TrimSpace(spec)
			if strings.HasPrefix(spec, "*") {
				return offer
			}
			if strings.HasPrefix(spec, offer) {
				return offer
			}
		}
	}
	return ""
}

// AcceptsLanguages : https://fiber.wiki/context#acceptslanguages
func (ctx *Ctx) AcceptsLanguages(offers ...string) string {
	if len(offers) == 0 {
		return ""
	}
	h := ctx.Get(fasthttp.HeaderAcceptLanguage)
	if h == "" {
		return offers[0]
	}

	specs := strings.Split(h, ",")
	for _, offer := range offers {
		for _, spec := range specs {
			spec = strings.TrimSpace(spec)
			if strings.HasPrefix(spec, "*") {
				return offer
			}
			if strings.HasPrefix(spec, offer) {
				return offer
			}
		}
	}
	return ""
}

// BaseUrl : https://fiber.wiki/context#baseurl
func (ctx *Ctx) BaseUrl() string {
	fmt.Println("Fiber deprecated c.BaseUrl(), this will be removed in v2: Use c.BaseURL() instead")
	return ctx.BaseURL()
}

// BaseURL : https://fiber.wiki/context#baseurl
func (ctx *Ctx) BaseURL() string {
	return ctx.Protocol() + "://" + ctx.Hostname()
}

// BasicAuth : https://fiber.wiki/context#basicauth
func (ctx *Ctx) BasicAuth() (user, pass string, ok bool) {
	auth := ctx.Get(fasthttp.HeaderAuthorization)
	if auth == "" {
		return
	}

	const prefix = "Basic "

	// Case insensitive prefix match.
	if len(auth) < len(prefix) || !strings.EqualFold(auth[:len(prefix)], prefix) {
		return
	}

	c, err := base64.StdEncoding.DecodeString(auth[len(prefix):])
	if err != nil {
		return
	}

	cs := getString(c)
	s := strings.IndexByte(cs, ':')
	if s < 0 {
		return
	}

	return cs[:s], cs[s+1:], true
}

// Body : https://fiber.wiki/context#body
func (ctx *Ctx) Body(args ...interface{}) string {
	if len(args) == 0 {
		return getString(ctx.Fasthttp.Request.Body())
	}

	if len(args) == 1 {
		switch arg := args[0].(type) {
		case string:
			return getString(ctx.Fasthttp.Request.PostArgs().Peek(arg))
		case []byte:
			return getString(ctx.Fasthttp.Request.PostArgs().PeekBytes(arg))
		case func(string, string):
			ctx.Fasthttp.Request.PostArgs().VisitAll(func(k []byte, v []byte) {
				arg(getString(k), getString(v))
			})
		default:
			return getString(ctx.Fasthttp.Request.Body())
		}
	}
	return ""
}

// BodyParser : https://fiber.wiki/context#bodyparser
func (ctx *Ctx) BodyParser(v interface{}) error {
	cType := getString(ctx.Fasthttp.Request.Header.ContentType())
	if cType == contentTypeJSON {
		return jsoniter.Unmarshal(ctx.Fasthttp.Request.Body(), &v)
	} else if cType == contentTypeXML {
		return xml.Unmarshal(ctx.Fasthttp.Request.Body(), &v)
	}
	return fmt.Errorf("cannot parse content-type: %v", cType)
}

// Cookies : https://fiber.wiki/context#cookies
func (ctx *Ctx) Cookies(args ...interface{}) string {
	if len(args) == 0 {
		return ctx.Get(fasthttp.HeaderCookie)
	}

	switch arg := args[0].(type) {
	case string:
		return getString(ctx.Fasthttp.Request.Header.Cookie(arg))
	case []byte:
		return getString(ctx.Fasthttp.Request.Header.CookieBytes(arg))
	case func(string, string):
		ctx.Fasthttp.Request.Header.VisitAllCookie(func(k, v []byte) {
			arg(getString(k), getString(v))
		})
	default:
		return ctx.Get(fasthttp.HeaderCookie)
	}

	return ""
}

// FormFile : https://fiber.wiki/context#formfile
func (ctx *Ctx) FormFile(key string) (*multipart.FileHeader, error) {
	return ctx.Fasthttp.FormFile(key)
}

// FormValue : https://fiber.wiki/context#formvalue
func (ctx *Ctx) FormValue(key string) string {
	return getString(ctx.Fasthttp.FormValue(key))
}

// Fresh : https://fiber.wiki/context#fresh
func (ctx *Ctx) Fresh() bool {
	return true
}

// Get : https://fiber.wiki/context#get
func (ctx *Ctx) Get(key string) string {
	if key == "referrer" {
		key = "referer"
	}
	return getString(ctx.Fasthttp.Request.Header.Peek(key))
}

// Hostname : https://fiber.wiki/context#hostname
func (ctx *Ctx) Hostname() string {
	return getString(ctx.Fasthttp.URI().Host())
}

// Ip is deprecated, this will be removed in v2: Use c.IP() instead
func (ctx *Ctx) Ip() string {
	fmt.Println("Fiber deprecated c.Ip(), this will be removed in v2: Use c.IP() instead")
	return ctx.IP()
}

// IP : https://fiber.wiki/context#Ip
func (ctx *Ctx) IP() string {
	return ctx.Fasthttp.RemoteIP().String()
}

// Ips is deprecated, this will be removed in v2: Use c.IPs() instead
func (ctx *Ctx) Ips() []string { // NOLINT
	fmt.Println("Fiber deprecated c.Ips(), this will be removed in v2: Use c.IPs() instead")
	return ctx.IPs()
}

// IPs : https://fiber.wiki/context#ips
func (ctx *Ctx) IPs() []string {
	ips := strings.Split(ctx.Get(fasthttp.HeaderXForwardedFor), ",")
	for i := range ips {
		ips[i] = strings.TrimSpace(ips[i])
	}
	return ips
}

// Is : https://fiber.wiki/context#is
func (ctx *Ctx) Is(ext string) bool {
	if ext[0] != '.' {
		ext = "." + ext
	}

	exts, _ := mime.ExtensionsByType(ctx.Get(fasthttp.HeaderContentType))
	if len(exts) > 0 {
		for _, item := range exts {
			if item == ext {
				return true
			}
		}
	}
	return false
}

// Locals : https://fiber.wiki/context#locals
func (ctx *Ctx) Locals(key string, val ...interface{}) interface{} {
	if len(val) == 0 {
		return ctx.Fasthttp.UserValue(key)
	}

	ctx.Fasthttp.SetUserValue(key, val[0])
	return nil
}

// Method : https://fiber.wiki/context#method
func (ctx *Ctx) Method() string {
	return getString(ctx.Fasthttp.Request.Header.Method())
}

// MultipartForm : https://fiber.wiki/context#multipartform
func (ctx *Ctx) MultipartForm() (*multipart.Form, error) {
	return ctx.Fasthttp.MultipartForm()
}

// OriginalUrl is deprecated, this will be removed in v2: Use c.OriginalURL() instead
func (ctx *Ctx) OriginalUrl() string {
	fmt.Println("Fiber deprecated c.OriginalUrl(), this will be removed in v2: Use c.OriginalURL() instead")
	return ctx.OriginalURL()
}

// OriginalURL : https://fiber.wiki/context#originalurl
func (ctx *Ctx) OriginalURL() string {
	return getString(ctx.Fasthttp.Request.Header.RequestURI())
}

// Params : https://fiber.wiki/context#params
func (ctx *Ctx) Params(key string) string {
	for i := 0; i < len(*ctx.params); i++ {
		if (*ctx.params)[i] == key {
			return ctx.values[i]
		}
	}
	return ""
}

// Path : https://fiber.wiki/context#path
func (ctx *Ctx) Path() string {
	return getString(ctx.Fasthttp.URI().Path())
}

// Protocol : https://fiber.wiki/context#protocol
func (ctx *Ctx) Protocol() string {
	if ctx.Fasthttp.IsTLS() {
		return "https"
	}
	return "http"
}

// Query : https://fiber.wiki/context#query
func (ctx *Ctx) Query(key string) string {
	return getString(ctx.Fasthttp.QueryArgs().Peek(key))
}

// Range : https://fiber.wiki/context#range
func (ctx *Ctx) Range() {

}

// Route : https://fiber.wiki/context#route
func (ctx *Ctx) Route() *Route {
	return ctx.route
}

// SaveFile : https://fiber.wiki/context#secure
func (ctx *Ctx) SaveFile(fh *multipart.FileHeader, path string) error {
	return fasthttp.SaveMultipartFile(fh, path)
}

// Secure : https://fiber.wiki/context#secure
func (ctx *Ctx) Secure() bool {
	return ctx.Fasthttp.IsTLS()
}

// SignedCookies : https://fiber.wiki/context#signedcookies
func (ctx *Ctx) SignedCookies() {

}

// Stale : https://fiber.wiki/context#stale
func (ctx *Ctx) Stale() bool {
	return true
}

// Subdomains : https://fiber.wiki/context#subdomains
func (ctx *Ctx) Subdomains(offset ...int) (subs []string) {
	o := 2
	if len(offset) > 0 {
		o = offset[0]
	}
	subs = strings.Split(ctx.Hostname(), ".")
	subs = subs[:len(subs)-o]
	return subs
}

// Xhr is deprecated, this will be removed in v2: Use c.XHR() instead
func (ctx *Ctx) Xhr() bool {
	fmt.Println("Fiber deprecated c.Xhr(), this will be removed in v2: Use c.XHR() instead")
	return ctx.XHR()
}

// XHR : https://fiber.wiki/context#xhr
func (ctx *Ctx) XHR() bool {
	return ctx.Get(fasthttp.HeaderXRequestedWith) == "XMLHttpRequest"
}