package context

import (
	"bytes"
	"errors"
	"io/ioutil"
	"net/http"
	"reflect"
	"strconv"
	"strings"

	"github.com/astaxie/beego/session"
)

// BeegoInput operates the http request header ,data ,cookie and body.
// it also contains router params and current session.
type BeegoInput struct {
	CruSession    session.SessionStore
	Params        map[string]string
	Data          map[interface{}]interface{} // store some values in this context when calling context in filter or controller.
	Request       *http.Request
	RequestBody   []byte
	RunController reflect.Type
	RunMethod     string
}

// NewInput return BeegoInput generated by http.Request.
func NewInput(req *http.Request) *BeegoInput {
	return &BeegoInput{
		Params:  make(map[string]string),
		Data:    make(map[interface{}]interface{}),
		Request: req,
	}
}

// Protocol returns request protocol name, such as HTTP/1.1 .
func (input *BeegoInput) Protocol() string {
	return input.Request.Proto
}

// Uri returns full request url with query string, fragment.
func (input *BeegoInput) Uri() string {
	return input.Request.RequestURI
}

// Url returns request url path (without query string, fragment).
func (input *BeegoInput) Url() string {
	return input.Request.URL.String()
}

// Site returns base site url as scheme://domain type.
func (input *BeegoInput) Site() string {
	return input.Scheme() + "://" + input.Domain()
}

// Scheme returns request scheme as "http" or "https".
func (input *BeegoInput) Scheme() string {
	if input.Request.URL.Scheme != "" {
		return input.Request.URL.Scheme
	} else if input.Request.TLS == nil {
		return "http"
	} else {
		return "https"
	}
}

// Domain returns host name.
// Alias of Host method.
func (input *BeegoInput) Domain() string {
	return input.Host()
}

// Host returns host name.
// if no host info in request, return localhost.
func (input *BeegoInput) Host() string {
	if input.Request.Host != "" {
		hostParts := strings.Split(input.Request.Host, ":")
		if len(hostParts) > 0 {
			return hostParts[0]
		}
		return input.Request.Host
	}
	return "localhost"
}

// Method returns http request method.
func (input *BeegoInput) Method() string {
	return input.Request.Method
}

// Is returns boolean of this request is on given method, such as Is("POST").
func (input *BeegoInput) Is(method string) bool {
	return input.Method() == method
}

// Is this a GET method request?
func (input *BeegoInput) IsGet() bool {
	return input.Is("GET")
}

// Is this a POST method request?
func (input *BeegoInput) IsPost() bool {
	return input.Is("POST")
}

// Is this a Head method request?
func (input *BeegoInput) IsHead() bool {
	return input.Is("HEAD")
}

// Is this a OPTIONS method request?
func (input *BeegoInput) IsOptions() bool {
	return input.Is("OPTIONS")
}

// Is this a PUT method request?
func (input *BeegoInput) IsPut() bool {
	return input.Is("PUT")
}

// Is this a DELETE method request?
func (input *BeegoInput) IsDelete() bool {
	return input.Is("DELETE")
}

// Is this a PATCH method request?
func (input *BeegoInput) IsPatch() bool {
	return input.Is("PATCH")
}

// IsAjax returns boolean of this request is generated by ajax.
func (input *BeegoInput) IsAjax() bool {
	return input.Header("X-Requested-With") == "XMLHttpRequest"
}

// IsSecure returns boolean of this request is in https.
func (input *BeegoInput) IsSecure() bool {
	return input.Scheme() == "https"
}

// IsSecure returns boolean of this request is in webSocket.
func (input *BeegoInput) IsWebsocket() bool {
	return input.Header("Upgrade") == "websocket"
}

// IsSecure returns boolean of whether file uploads in this request or not..
func (input *BeegoInput) IsUpload() bool {
	return input.Header("Content-Type") == "multipart/form-data"
}

// IP returns request client ip.
// if in proxy, return first proxy id.
// if error, return 127.0.0.1.
func (input *BeegoInput) IP() string {
	ips := input.Proxy()
	if len(ips) > 0 && ips[0] != "" {
		return ips[0]
	}
	ip := strings.Split(input.Request.RemoteAddr, ":")
	if len(ip) > 0 {
		if ip[0] != "[" {
			return ip[0]
		}
	}
	return "127.0.0.1"
}

// Proxy returns proxy client ips slice.
func (input *BeegoInput) Proxy() []string {
	if ips := input.Header("X-Forwarded-For"); ips != "" {
		return strings.Split(ips, ",")
	}
	return []string{}
}

// Refer returns http referer header.
func (input *BeegoInput) Refer() string {
	return input.Header("Referer")
}

// SubDomains returns sub domain string.
// if aa.bb.domain.com, returns aa.bb .
func (input *BeegoInput) SubDomains() string {
	parts := strings.Split(input.Host(), ".")
	return strings.Join(parts[len(parts)-2:], ".")
}

// Port returns request client port.
// when error or empty, return 80.
func (input *BeegoInput) Port() int {
	parts := strings.Split(input.Request.Host, ":")
	if len(parts) == 2 {
		port, _ := strconv.Atoi(parts[1])
		return port
	}
	return 80
}

// UserAgent returns request client user agent string.
func (input *BeegoInput) UserAgent() string {
	return input.Header("User-Agent")
}

// Param returns router param by a given key.
func (input *BeegoInput) Param(key string) string {
	if v, ok := input.Params[key]; ok {
		return v
	}
	return ""
}

// Query returns input data item string by a given string.
func (input *BeegoInput) Query(key string) string {
	if val := input.Param(key); val != "" {
		return val
	}
	if input.Request.Form == nil {
		input.Request.ParseForm()
	}
	return input.Request.Form.Get(key)
}

// Header returns request header item string by a given string.
func (input *BeegoInput) Header(key string) string {
	return input.Request.Header.Get(key)
}

// Cookie returns request cookie item string by a given key.
// if non-existed, return empty string.
func (input *BeegoInput) Cookie(key string) string {
	ck, err := input.Request.Cookie(key)
	if err != nil {
		return ""
	}
	return ck.Value
}

// Session returns current session item value by a given key.
func (input *BeegoInput) Session(key interface{}) interface{} {
	return input.CruSession.Get(key)
}

// Body returns the raw request body data as bytes.
func (input *BeegoInput) CopyBody() []byte {
	requestbody, _ := ioutil.ReadAll(input.Request.Body)
	input.Request.Body.Close()
	bf := bytes.NewBuffer(requestbody)
	input.Request.Body = ioutil.NopCloser(bf)
	input.RequestBody = requestbody
	return requestbody
}

// GetData returns the stored data in this context.
func (input *BeegoInput) GetData(key interface{}) interface{} {
	if v, ok := input.Data[key]; ok {
		return v
	}
	return nil
}

// SetData stores data with given key in this context.
// This data are only available in this context.
func (input *BeegoInput) SetData(key, val interface{}) {
	input.Data[key] = val
}

// parseForm or parseMultiForm based on Content-type
func (input *BeegoInput) ParseFormOrMulitForm(maxMemory int64) error {
	// Parse the body depending on the content type.
	if strings.Contains(input.Header("Content-Type"), "multipart/form-data") {
		if err := input.Request.ParseMultipartForm(maxMemory); err != nil {
			return errors.New("Error parsing request body:" + err.Error())
		}
	} else if err := input.Request.ParseForm(); err != nil {
		return errors.New("Error parsing request body:" + err.Error())
	}
	return nil
}