package middleware

import (
	"context"
	"fmt"
	"github.com/fossyy/filekeeper/app"
	errorView "github.com/fossyy/filekeeper/view/client/error"
	"net/http"
	"strings"

	"github.com/fossyy/filekeeper/session"
	"github.com/fossyy/filekeeper/utils"
)

type wrapper struct {
	http.ResponseWriter
	request    *http.Request
	statusCode int
}

func (w *wrapper) WriteHeader(code int) {
	w.statusCode = code

	if code == http.StatusNotFound {
		w.Header().Set("Content-Type", "text/html")
		w.ResponseWriter.WriteHeader(code)
		component := errorView.NotFound("Not Found")
		err := component.Render(w.request.Context(), w)
		if err != nil {
			app.Server.Logger.Error(err.Error())
			return
		}
		return
	}

	if code == http.StatusInternalServerError {
		w.Header().Set("Content-Type", "text/html")
		w.ResponseWriter.WriteHeader(code)
		component := errorView.InternalServerError("Internal Server Error")
		err := component.Render(w.request.Context(), w)
		if err != nil {
			app.Server.Logger.Error(err.Error())
			return
		}
		return
	}
	w.ResponseWriter.WriteHeader(code)

	return
}

func Handler(next http.Handler) http.Handler {
	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		if request.Header.Get("upgrade") == "websocket" {
			hijacker, ok := writer.(http.Hijacker)
			if !ok {
				http.Error(writer, "Hijacking not supported", http.StatusInternalServerError)
				return
			}
			hijack, _, err := hijacker.Hijack()
			if err != nil {
				http.Error(writer, err.Error(), http.StatusInternalServerError)
				return
			}
			defer hijack.Close()
			rw := NewHijackWriter(hijack)
			app.Server.Logger.Info(fmt.Sprintf("%s %s %s %v", utils.ClientIP(request), "WEBSOCKET", request.RequestURI, http.StatusSwitchingProtocols))
			next.ServeHTTP(rw, request)
			return
		}

		address := strings.Split(utils.Getenv("CORS_LIST"), ",")

		for _, addr := range address {
			if request.Host == addr {
				writer.Header().Set("Access-Control-Allow-Origin", fmt.Sprintf("%s://%s", utils.Getenv("CORS_PROTO"), addr))
			}
		}

		wrappedWriter := &wrapper{
			ResponseWriter: writer,
			request:        request,
			statusCode:     http.StatusOK,
		}

		writer.Header().Set("Access-Control-Allow-Methods", fmt.Sprintf("%s, OPTIONS", utils.Getenv("CORS_METHODS")))
		writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
		next.ServeHTTP(wrappedWriter, request)
		app.Server.Logger.Info(fmt.Sprintf("%s %s %s %v", utils.ClientIP(request), request.Method, request.RequestURI, wrappedWriter.statusCode))
	})
}

func Auth(next http.HandlerFunc) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		status, user, sessionID := session.GetSession(r)

		switch status {
		case session.Authorized:
			ctx := context.WithValue(r.Context(), "user", user)
			ctx = context.WithValue(ctx, "sessionID", sessionID)
			req := r.WithContext(ctx)
			next.ServeHTTP(w, req)
			return
		case session.Unauthorized:
			if r.RequestURI != "/logout" {
				http.SetCookie(w, &http.Cookie{
					Name:  "redirect",
					Value: r.RequestURI,
					Path:  "/",
				})
			}
			http.Redirect(w, r, "/auth/signin", http.StatusSeeOther)
			return
		case session.InvalidSession:
			http.SetCookie(w, &http.Cookie{
				Name:   "Session",
				Value:  "",
				Path:   "/",
				MaxAge: -1,
			})
			http.Redirect(w, r, "/auth/signin", http.StatusSeeOther)
			return
		case session.Suspicious:
			userSession := session.Get(sessionID)
			err := userSession.Delete()
			if err != nil {
				app.Server.Logger.Error(err)
			}
			err = session.RemoveSessionInfo(user.Email, sessionID)
			if err != nil {
				app.Server.Logger.Error(err)
				return
			}
			http.SetCookie(w, &http.Cookie{
				Name:   "Session",
				Value:  "",
				Path:   "/",
				MaxAge: -1,
			})
			http.Redirect(w, r, "/auth/signin?error=suspicious_session", http.StatusSeeOther)
			return
		default:
			http.Redirect(w, r, "/", http.StatusSeeOther)
			return
		}
	})
}

func Guest(next http.HandlerFunc) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		status, _, _ := session.GetSession(r)

		switch status {
		case session.Authorized:
			http.Redirect(w, r, "/", http.StatusSeeOther)
			return
		case session.Unauthorized:
			next.ServeHTTP(w, r)
			return
		case session.InvalidSession:
			http.SetCookie(w, &http.Cookie{
				Name:   "Session",
				Value:  "",
				Path:   "/",
				MaxAge: -1,
			})
			next.ServeHTTP(w, r)
			return
		}
	})
}