package plugin

import (
	"encoding/json"
	"github.com/gorilla/mux"
	"github.com/mattermost/mattermost/server/public/plugin"
	"net/http"
	"path/filepath"
)

type httpResponse struct {
	Status string      `json:"status"`
	Error  string      `json:"error,omitempty"`
	Data   interface{} `json:"data,omitempty"`
}

func (p *Plugin) sendError(w http.ResponseWriter, err string) {
	errEnc := json.NewEncoder(w).Encode(httpResponse{
		Status: "error",
		Error:  err,
	})
	if errEnc != nil {
		p.API.LogError("cant encode error response", "error", errEnc)
	}
}

func (p *Plugin) sendRes(w http.ResponseWriter, resp httpResponse) {
	errEnc := json.NewEncoder(w).Encode(resp)
	if errEnc != nil {
		p.API.LogError("cant encode error response", "error", errEnc)
	}
}

func (p *Plugin) InitApi() {
	p.router = mux.NewRouter()

	p.router.Use(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			if userID := r.Header.Get("Mattermost-User-Id"); userID != "" {
				next.ServeHTTP(w, r)
				return
			}
			http.Error(w, "Not authorized", http.StatusUnauthorized)
		})
	})

	// Add your API routes here
	p.router.HandleFunc("/example", p.handleExample).Methods("GET")
	p.router.HandleFunc("/assets/{fileName}", p.handleAssetFile).Methods("GET")
}

func (p *Plugin) ServeHTTP(_ *plugin.Context, w http.ResponseWriter, r *http.Request) {
	p.router.ServeHTTP(w, r)
}

func (p *Plugin) handleAssetFile(w http.ResponseWriter, r *http.Request) {
	fileName := mux.Vars(r)["fileName"]
	http.ServeFile(w, r, filepath.Join(p.bundlePath, "assets", fileName))
}

func (p *Plugin) handleExample(w http.ResponseWriter, r *http.Request) {
	p.sendRes(w, httpResponse{
		Status: "OK",
		Data: map[string]interface{}{
			"message": "Hello from template plugin",
		},
	})
}