package handlers

import (
	"fmt"
	"strconv"
	"demoon/config"
	"demoon/internal/database/repos" 
	"demoon/internal/models"
	"html/template"
	"log/slog"
	"net/http"
	"os"
)

// Handlers structure
type Handlers struct {
	cfg  config.Config
	log  *slog.Logger
	repo repos.FullRepo
}

// NewHandlers constructor
func NewHandlers(
	cfg config.Config, l *slog.Logger, repo repos.FullRepo,
) *Handlers {
	if l == nil {
		l = slog.New(slog.NewJSONHandler(os.Stdout, nil))
	}
	h := &Handlers{
		cfg:  cfg,
		log:  l,
		repo: repo,
	}
	return h
}

func (h *Handlers) Ping(w http.ResponseWriter, r *http.Request) {
	h.log.Info("got ping request")
	w.Write([]byte("pong"))
}

func (h *Handlers) HandleAnswer(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		h.log.Error("failed to parse form", "error", err)
		abortWithError(w, "Invalid form data")
		return
	}

	selectedIndex := r.FormValue("selected")
	questionID := r.FormValue("question_id")
	if selectedIndex == "" || questionID == "" {
		h.log.Error("missing form values", "selected", selectedIndex, "question_id", questionID)
		abortWithError(w, "Missing required fields")
		return
	}

	h.log.Info("answer received", 
		"selected", selectedIndex, 
		"question_id", questionID)

	question, err := h.repo.DBGetQuestion(questionID)
	if err != nil {
		h.log.Error("failed to get question", "error", err, "question_id", questionID)
		abortWithError(w, "Question not found")
		return
	}

	// Convert selectedIndex to int for comparison
	selectedIdx, err := strconv.Atoi(selectedIndex)
	if err != nil {
		h.log.Error("invalid selected index", "error", err, "selected", selectedIndex)
		abortWithError(w, "Invalid answer selection")
		return
	}

	// Validate selected index is within bounds
	if selectedIdx < 0 || selectedIdx > 3 {
		h.log.Error("selected index out of bounds", "selected", selectedIndex)
		abortWithError(w, "Invalid answer selection")
		return
	}

	feedback := ""
	if selectedIdx == int(question.CorrectIndex) {
		feedback = `<div data-testid="feedback" class="feedback">Correct! 🎉</div>`
	} else {
		feedback = `<div data-testid="feedback" class="feedback">Wrong answer! The correct answer was: ` + getCorrectOption(question) + `</div>`
	}

	w.Header().Set("Content-Type", "text/html")
	w.Write([]byte(feedback))
}

func getCorrectOption(q *models.Question) string {
	switch q.CorrectIndex {
	case 0:
		return q.Option1
	case 1:
		return q.Option2
	case 2:
		return q.Option3
	case 3:
		return q.Option4
	default:
		return ""
	}
}

func (h *Handlers) MainPage(w http.ResponseWriter, r *http.Request) {
	tmpl, err := template.ParseGlob("components/*.html")
	if err != nil {
		abortWithError(w, err.Error())
		return
	}
	testQuestion := &models.Question{
		ID:           1,
		Text:         "___ du keine Zweifel daran?",
		Option1:      "Haben",
		Option2:      "Hast",
		Option3:      "Hat",
		Option4:      "Habt",
		CorrectIndex: 1,
		Requirement:  "Choose the correct verb form",
		Explanation: "Use 'Hast' for 2nd person singular",
		Status:      0,
		ExamID:      1,
		MixedID:     101,
	}
	err = tmpl.ExecuteTemplate(w, "main", testQuestion)
	if err != nil {
		h.log.Error("failed to render template", "error", err)
		abortWithError(w, "Failed to render page")
	}
}