package handler

import (
	"me-fit/service"
	"me-fit/template"
	"me-fit/template/workout"
	"me-fit/types"
	"me-fit/utils"

	"database/sql"
	"log/slog"
	"net/http"
	"strconv"
	"time"
)

type WorkoutHandler interface {
	handle(router *http.ServeMux)
}

type WorkoutHandlerImpl struct {
	db             *sql.DB
	service        service.WorkoutService
	auth           service.AuthService
	serverSettings *types.ServerSettings
}

func NewWorkoutHandler(db *sql.DB, service service.WorkoutService, auth service.AuthService, serverSettings *types.ServerSettings) HandlerAuth {
	return WorkoutHandlerImpl{
		db:             db,
		service:        service,
		auth:           auth,
		serverSettings: serverSettings,
	}
}

func (handler WorkoutHandlerImpl) handle(router *http.ServeMux) {
	router.Handle("/workout", handler.handleWorkoutPage())
	router.Handle("POST /api/workout", handler.handleAddWorkout())
	router.Handle("GET /api/workout", handler.handleGetWorkout())
	router.Handle("DELETE /api/workout/{id}", handler.handleDeleteWorkout())
}

func (handler WorkoutHandlerImpl) handleWorkoutPage() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := handler.auth.GetUserFromSessionId(utils.GetSessionID(r))
		if err != nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		currentDate := time.Now().Format("2006-01-02")
		inner := workout.WorkoutComp(currentDate)
		userComp := service.UserInfoComp(user)
		err = template.Layout(inner, userComp, handler.serverSettings.Environment).Render(r.Context(), w)
		if err != nil {
			utils.LogError("Failed to render workout page", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		}
	}
}

func (handler WorkoutHandlerImpl) handleAddWorkout() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := handler.auth.GetUserFromSessionId(utils.GetSessionID(r))
		if err != nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		var dateStr = r.FormValue("date")
		var typeStr = r.FormValue("type")
		var setsStr = r.FormValue("sets")
		var repsStr = r.FormValue("reps")

		wo := service.NewWorkoutDto("", dateStr, typeStr, setsStr, repsStr)
		wo, err = handler.service.AddWorkout(user, wo)
		if err != nil {
			utils.TriggerToast(w, r, "error", "Invalid input values")
			http.Error(w, "Invalid input values", http.StatusBadRequest)
			return
		}
		wor := workout.Workout{Id: wo.RowId, Date: wo.Date, Type: wo.Type, Sets: wo.Sets, Reps: wo.Reps}

		err = workout.WorkoutItemComp(wor, true).Render(r.Context(), w)
		if err != nil {
			utils.LogError("Could not render workoutitem", err)
			utils.TriggerToast(w, r, "error", "Internal Server Error")
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	}
}

func (handler WorkoutHandlerImpl) handleGetWorkout() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := handler.auth.GetUserFromSessionId(utils.GetSessionID(r))
		if err != nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		workouts, err := handler.service.GetWorkouts(user)
		if err != nil {
			return
		}

		wos := make([]workout.Workout, 0)
		for _, wo := range workouts {
			wos = append(wos, workout.Workout{Id: wo.RowId, Date: wo.Date, Type: wo.Type, Sets: wo.Sets, Reps: wo.Reps})
		}

		workout.WorkoutListComp(wos).Render(r.Context(), w)
	}
}

func (handler WorkoutHandlerImpl) handleDeleteWorkout() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := handler.auth.GetUserFromSessionId(utils.GetSessionID(r))
		if err != nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		rowId := r.PathValue("id")
		if rowId == "" {
			http.Error(w, "Missing required fields", http.StatusBadRequest)
			slog.Warn("Missing required fields for workout delete")
			utils.TriggerToast(w, r, "error", "Missing ID field")
			return
		}

		rowIdInt, err := strconv.Atoi(rowId)
		if err != nil {
			http.Error(w, "Invalid ID", http.StatusBadRequest)
			slog.Warn("Invalid ID for workout delete")
			utils.TriggerToast(w, r, "error", "Invalid ID")
			return
		}

		err = handler.service.DeleteWorkout(user, rowIdInt)
		if err != nil {
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			slog.Error("Could not delete workout: " + err.Error())
			utils.TriggerToast(w, r, "error", "Internal Server Error")
			return
		}
	}
}