package routes

import (
	"encoding/json"
	"gitea.deepak.science/deepak/gogmagog/models"
	"github.com/go-chi/chi"
	"io"
	"net/http"
	"strconv"
)

func newActionRouter(m *models.Model) http.Handler {
	router := chi.NewRouter()
	router.Get("/", getActionsFunc(m))
	router.Post("/", postActionFunc(m))
	router.Get("/{actionid}", getActionByIDFunc(m))
	router.Put("/{actionid}", putActionFunc(m))
	return router
}

func getActionsFunc(m *models.Model) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var (
			actions []*models.Action
			err     error
		)
		planIDString := r.URL.Query().Get("plan_id")
		if planIDString == "" {
			actions, err = m.Actions()
		} else {
			planID, convErr := strconv.ParseInt(planIDString, 10, 64)
			if convErr != nil {
				actions = []*models.Action{}
				err = nil
			} else {
				plan := &models.Plan{PlanID: planID}
				actions, err = m.GetActions(plan)
			}
		}
		if err != nil {
			serverError(w, err)
			return
		}
		w.Header().Add("Content-Type", "application/json")
		if err := json.NewEncoder(w).Encode(actions); err != nil {
			serverError(w, err)
		}
	}
}

func getActionByIDFunc(m *models.Model) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id, err := strconv.Atoi(chi.URLParam(r, "actionid"))
		if err != nil {
			notFoundHandler(w, r)
			return
		}
		action, err := m.Action(id)
		if err != nil {
			if models.IsNotFoundError(err) {
				notFoundHandler(w, r)
				return
			}
			serverError(w, err)
			return

		}
		w.Header().Add("Content-Type", "application/json")
		if err := json.NewEncoder(w).Encode(action); err != nil {
			serverError(w, err)
		}
	}
}

type createActionResponse struct {
	CreatedAction *models.Action `json:"created_action"`
	ID            int64          `json:"id"`
}

func postActionFunc(m *models.Model) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {

		r.Body = http.MaxBytesReader(w, r.Body, 1024)
		dec := json.NewDecoder(r.Body)
		dec.DisallowUnknownFields()
		var a models.Action
		err := dec.Decode(&a)
		if err != nil {
			badRequestError(w, err)
			return
		}
		err = dec.Decode(&struct{}{})
		if err != io.EOF {
			badRequestError(w, err)
			return
		}

		action := &models.Action{
			ActionDescription: a.ActionDescription,
			EstimatedChunks:   a.EstimatedChunks,
			CompletedChunks:   a.CompletedChunks,
			CompletedOn:       a.CompletedOn,
			PlanID:            a.PlanID,
		}
		id, err := m.AddAction(action)
		if err != nil {
			serverError(w, err)
			return
		}
		action, err = m.Action(id)
		if err != nil {
			serverError(w, err)
			return
		}

		response := &createActionResponse{
			CreatedAction: action,
			ID:            int64(id),
		}
		w.WriteHeader(http.StatusCreated)
		w.Header().Add("Content-Type", "application/json")
		if err := json.NewEncoder(w).Encode(response); err != nil {
			serverError(w, err)
		}

	}
}

type updateActionResponse struct {
	UpdatedAction *models.Action `json:"updated_action"`
	ID            int64          `json:"id"`
}

func putActionFunc(m *models.Model) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id, err := strconv.Atoi(chi.URLParam(r, "actionid"))
		if err != nil {
			notFoundHandler(w, r)
			return
		}
		r.Body = http.MaxBytesReader(w, r.Body, 1024)
		dec := json.NewDecoder(r.Body)
		dec.DisallowUnknownFields()
		var a models.Action
		err = dec.Decode(&a)
		if err != nil {
			badRequestError(w, err)
			return
		}
		err = dec.Decode(&struct{}{})
		if err != io.EOF {
			badRequestError(w, err)
			return
		}

		action := &models.Action{
			ActionDescription: a.ActionDescription,
			EstimatedChunks:   a.EstimatedChunks,
			CompletedChunks:   a.CompletedChunks,
			CompletedOn:       a.CompletedOn,
			PlanID:            a.PlanID,
			ActionID:          int64(id),
		}
		err = m.SaveAction(action)
		if err != nil {
			serverError(w, err)
			return
		}
		action, err = m.Action(id)
		if err != nil {
			serverError(w, err)
			return
		}

		response := &updateActionResponse{
			UpdatedAction: action,
			ID:            int64(id),
		}
		w.WriteHeader(http.StatusOK)
		w.Header().Add("Content-Type", "application/json")
		if err := json.NewEncoder(w).Encode(response); err != nil {
			serverError(w, err)
		}

	}
}