DAS_2024_1/bazunov_andrew_lab_3/TaskApp/handlers/handlers.go

package handlers

import (
	"TaskApp/httpClient"
	"TaskApp/models"
	"TaskApp/repository"
	"encoding/json"
	"fmt"
	"github.com/gorilla/mux"
	"net/http"
	"strconv"
)

func InitRoutes(r *mux.Router, rep repository.TaskRepository, cln httpClient.Client) {
	r.HandleFunc("/", GetTasks(rep)).Methods("GET")
	r.HandleFunc("/{id:[0-9]+}", GetTaskById(rep)).Methods("GET")
	r.HandleFunc("/", CreateTask(rep, cln)).Methods("POST")
	r.HandleFunc("/{id:[0-9]+}", UpdateTask(rep)).Methods("PUT")
	r.HandleFunc("/{id:[0-9]+}", DeleteTask(rep)).Methods("DELETE")
	r.HandleFunc("/f/{id:[0-9]+}", GetPersonTasks(rep)).Methods("GET")
}

func GetTasks(rep repository.TaskRepository) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		tasks, err := rep.GetAllTasks()
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		err = json.NewEncoder(w).Encode(tasks)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
		}
	}
}

func GetTaskById(rep repository.TaskRepository) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		id, err := strconv.Atoi(mux.Vars(r)["id"])
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		person, err := rep.GetTaskById(id)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		err = json.NewEncoder(w).Encode(person)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}

func GetPersonTasks(rep repository.TaskRepository) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		id, err := strconv.Atoi(mux.Vars(r)["id"])
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		tasks, err := rep.GetUserTasks(id)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		err = json.NewEncoder(w).Encode(tasks)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}

func CreateTask(rep repository.TaskRepository, cln httpClient.Client) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")

		var task *models.TaskCreate

		err := json.NewDecoder(r.Body).Decode(&task)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if &task.Name == nil || &task.PersonId == nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		person, err := cln.GetPerson(task.PersonId)

		if err != nil {
			fmt.Println(err)
			http.Error(w, "Connection to PersonApp is confused.", http.StatusInternalServerError)
			return
		}

		if person == nil {
			http.Error(w, fmt.Sprintf("Person with id=%d is't founded.", person.Id), http.StatusBadGateway)
			return
		}

		newTask, err := rep.CreateTask(*task)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		w.WriteHeader(http.StatusCreated)
		err = json.NewEncoder(w).Encode(newTask)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}

func UpdateTask(rep repository.TaskRepository) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")

		id, err := strconv.Atoi(mux.Vars(r)["id"])
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		var task *models.TaskCreate

		err = json.NewDecoder(r.Body).Decode(&task)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		newTask, err := rep.UpdateTask(models.Task{Id: id, Name: task.Name, Date: task.Date})
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		err = json.NewEncoder(w).Encode(newTask)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	}
}

func DeleteTask(rep repository.TaskRepository) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")

		id, err := strconv.Atoi(mux.Vars(r)["id"])
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		err = rep.DeleteTask(id)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.WriteHeader(http.StatusOK)
	}
}