package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"recipe-manager/config"
	"recipe-manager/data"
	"recipe-manager/routers"
	"strings"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/cors"
	"github.com/spf13/viper"
)

func loadConfig(path string) (*config.ServerConfig, error) {
	viper.AddConfigPath(path)
	viper.SetConfigName("app")
	viper.SetConfigType("env")

	viper.AutomaticEnv()

	var config config.ServerConfig
	err := viper.ReadInConfig()
	if err != nil {
		return nil, err
	}

	err = viper.Unmarshal(&config)
	if err != nil {
		return nil, err
	}

	return &config, nil
}

type Server struct {
	server *http.Server
	data   *data.Data
	cfg    *config.ServerConfig
}

func NewServer() *Server {

	serverCfg, err := loadConfig(".")

	if err != nil {
		log.Fatal(err)
	}

	log.Println(serverCfg)

	return &Server{
		server: &http.Server{Addr: fmt.Sprintf(":%d", serverCfg.ServerPort)},
		data:   data.NewData(),
		cfg:    serverCfg,
	}
}

func (s *Server) Run() error {

	s.createHandler()
	log.Printf("Server running on %s", s.server.Addr)
	return s.server.ListenAndServe()
}

func (s *Server) createHandler() {
	r := chi.NewRouter()

	r.Use(cors.Handler(cors.Options{
		AllowedOrigins:   strings.Split(s.cfg.AllowedOrigins, ","),
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		AllowCredentials: true,
		ExposedHeaders:   []string{"Content-Type"},
		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE"},
	}))

	database := data.NewData()

	// Auth Router
	r.Group(func(r chi.Router) {
		ar := routers.NewAuthRouter(s.cfg)
		ar.Route(r)
	})

	// Protect Group
	r.Group(func(r chi.Router) {

		r.Use(func(next http.Handler) http.Handler {
			return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

				cookie, err := r.Cookie("access_token")

				if err != nil {
					w.WriteHeader(http.StatusUnauthorized)
					return
				}

				// verify token by request to google api
				res, err := http.Get("https://www.googleapis.com/oauth2/v3/tokeninfo?id_token=" + url.QueryEscape(cookie.Value))

				if err != nil {
					w.WriteHeader(http.StatusUnauthorized)
					return
				}

				defer res.Body.Close()

				var tokenInfo map[string]interface{}
				json.NewDecoder(res.Body).Decode(&tokenInfo)

				log.Println(tokenInfo)

				next.ServeHTTP(w, r)
			})
		})

		r.Post("/merge", func(w http.ResponseWriter, r *http.Request) {

			var targetMap map[string]interface{}
			err := json.NewDecoder(r.Body).Decode(&targetMap)
			if err != nil {
				w.WriteHeader(http.StatusBadRequest)
				log.Fatalln("Merge request failed: ", err)
				return
			}
			repo_path := "cofffeemachineConfig/coffeethai02_"

			master_version := targetMap["master"].(string)
			dev_version := targetMap["dev"].(string)
			output_path := targetMap["output"].(string)
			changelog_path := targetMap["changelog"].(string)

			// find target file in the cofffeemachineConfig
			if _, err := os.Stat(repo_path + master_version + ".json"); err != nil {
				w.WriteHeader(http.StatusBadRequest)
				log.Fatalln("Merge request failed. Master file not found: ", err)
				return
			}
			if _, err := os.Stat(repo_path + dev_version + ".json"); err != nil {
				w.WriteHeader(http.StatusBadRequest)
				log.Fatalln("Merge request failed. Dev file not found: ", err)
				return
			}

			master_path := repo_path + master_version + ".json"
			dev_path := repo_path + dev_version + ".json"

			// // output path
			// output_path := ""

			// // changelog path
			// changelog_path := ""

			// TODO: Call merge api if found

			// lookup for python exec
			py_exec, err := exec.LookPath("python")
			if err != nil {
				log.Fatalln("Python error: ", err)
			} else {
				py_exec, err = filepath.Abs(py_exec)
			}

			log.Println("Found python exec: ", py_exec)
			// target api file
			merge_api, api_err := os.Open("./python_api/merge_recipe.py")
			if api_err != nil {
				log.Fatalln("Merge request failed. Python api error: ", api_err)
			}
			log.Println("Locate python api", merge_api.Name())
			cmd := exec.Command(py_exec, merge_api.Name(), "merge", master_path, dev_path, output_path, changelog_path, "debug")

			log.Println("Run merge command", cmd)
			err = cmd.Run()
			if err != nil {
				log.Fatalln("Merge request failed. Python merge failed: ", err)
			}

			w.Header().Add("Content-Type", "application/json")
			w.WriteHeader(http.StatusOK)
			json.NewEncoder(w).Encode(map[string]string{"message": "Merge success"})

		})

		r.Get("/dllog", func(w http.ResponseWriter, r *http.Request) {

		})
		// Recipe Router
		rr := routers.NewRecipeRouter(database)
		rr.Route(r)

	})

	r.NotFound(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("Content-Type", "application/json")
		w.WriteHeader(http.StatusNotFound)
		json.NewEncoder(w).Encode(map[string]string{"message": fmt.Sprintf("path %s are not exits", r.RequestURI)})
	})

	s.server.Handler = r
}

func (s *Server) Shutdown(ctx context.Context) error {
	return s.server.Shutdown(ctx)
}