package main

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
)

type ProgressInfo struct {
	Percentage  float64
	CurrentFile string
	Paused      bool
}

func handleRoot(w http.ResponseWriter, r *http.Request) {
	progressMutex.Lock()
	defer progressMutex.Unlock()

	jobsInfo := make(map[string]struct {
		Percentage  float64
		CurrentFile string
		Paused      bool
	})

	for filename, info := range progress {
		jobsInfo[filename] = struct {
			Percentage  float64
			CurrentFile string
			Paused      bool
		}{
			Percentage:  info.Percentage,
			CurrentFile: info.CurrentFile,
			Paused:      info.Paused,
		}
	}

	err := templates.ExecuteTemplate(w, "index", struct {
		Jobs map[string]struct {
			Percentage  float64
			CurrentFile string
			Paused      bool
		}
	}{jobsInfo})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func handleUpload(w http.ResponseWriter, r *http.Request) {
	file, header, err := r.FormFile("file")
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	defer file.Close()

	tempFile, err := os.CreateTemp(uploadDir, header.Filename)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer tempFile.Close()

	_, err = io.Copy(tempFile, file)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	tempFilename := filepath.Base(tempFile.Name())

	_, err = parseInputFile(tempFile.Name())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	http.Redirect(w, r, "/select?filename="+tempFilename, http.StatusSeeOther)
}

func handleSelect(w http.ResponseWriter, r *http.Request) {
	filename := r.URL.Query().Get("filename")
	items, err := parseInputFile(filepath.Join(uploadDir, filename))
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	groupedItems := groupItemsBySeason(items)

	err = templates.ExecuteTemplate(w, "select", struct {
		Filename string
		Items    map[string][]Item
	}{
		Filename: filename,
		Items:    groupedItems,
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func handleProcess(w http.ResponseWriter, r *http.Request) {
	filename := r.FormValue("filename")
	selectedItems := r.Form["items"]

	items, err := parseInputFile(filepath.Join(uploadDir, filename))
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	filteredItems := filterSelectedItems(items, selectedItems)

	go func() {
		err := processItems(filename, filteredItems)
		if err != nil {
			fmt.Printf("Error processing file: %v\n", err)
		}

		os.Remove(filepath.Join(uploadDir, filename))
	}()

	http.Redirect(w, r, "/progress?filename="+filename, http.StatusSeeOther)
}

func handleProgress(w http.ResponseWriter, r *http.Request) {
	filename := r.URL.Query().Get("filename")
	fmt.Printf("Handling progress request for filename: %s\n", filename)

	if r.Header.Get("Accept") == "application/json" {
		progressInfo := getProgress(filename)
		fmt.Printf("Progress info for %s: %+v\n", filename, progressInfo)

		if progressInfo == nil {
			w.WriteHeader(http.StatusNotFound)
			json.NewEncoder(w).Encode(map[string]string{"error": "No progress information found"})
			return
		}

		w.Header().Set("Content-Type", "application/json")
		err := json.NewEncoder(w).Encode(progressInfo)
		if err != nil {
			fmt.Printf("Error encoding progress info: %v\n", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
		return
	}

	err := templates.ExecuteTemplate(w, "progress", struct{ Filename string }{filename})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func handlePause(w http.ResponseWriter, r *http.Request) {
	filename := r.URL.Query().Get("filename")
	if filename == "" {
		http.Error(w, "Filename is required", http.StatusBadRequest)
		return
	}

	jobsMutex.Lock()
	jobInfo, exists := jobs[filename]
	jobsMutex.Unlock()

	if !exists {
		http.Error(w, "Job not found", http.StatusNotFound)
		return
	}

	jobInfo.Paused = true
	if jobInfo.Cmd != nil && jobInfo.Cmd.Process != nil {
		jobInfo.Cmd.Process.Kill()
	}

	progressMutex.Lock()
	if progressInfo, ok := progress[filename]; ok {
		progressInfo.Paused = true
	}
	progressMutex.Unlock()

	fmt.Fprintf(w, "Pause signal sent for %s", filename)
}

func handleResume(w http.ResponseWriter, r *http.Request) {
	filename := r.URL.Query().Get("filename")
	if filename == "" {
		http.Error(w, "Filename is required", http.StatusBadRequest)
		return
	}

	jobsMutex.Lock()
	jobInfo, exists := jobs[filename]
	jobsMutex.Unlock()

	if !exists {
		http.Error(w, "Job not found", http.StatusNotFound)
		return
	}

	jobInfo.Paused = false
	jobInfo.ResumeChan <- struct{}{}

	// Update the progress information
	progressMutex.Lock()
	if progressInfo, ok := progress[filename]; ok {
		progressInfo.Paused = false
	}
	progressMutex.Unlock()

	fmt.Fprintf(w, "Resume signal sent for %s", filename)
}

func handleAbort(w http.ResponseWriter, r *http.Request) {
	filename := r.URL.Query().Get("filename")
	if filename == "" {
		http.Error(w, "Filename is required", http.StatusBadRequest)
		return
	}

	jobsMutex.Lock()
	jobInfo, exists := jobs[filename]
	jobsMutex.Unlock()

	if !exists {
		http.Error(w, "Job not found", http.StatusNotFound)
		return
	}

	close(jobInfo.AbortChan)
	if jobInfo.Cmd != nil && jobInfo.Cmd.Process != nil {
		jobInfo.Cmd.Process.Kill()
	}

	if jobInfo.TempDir != "" {
		os.RemoveAll(jobInfo.TempDir)
	}

	fmt.Fprintf(w, "Abort signal sent for %s", filename)
}

func handleClearCompleted(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	clearCompletedJobs()

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]bool{"success": true})
}

func clearCompletedJobs() {
	progressMutex.Lock()
	defer progressMutex.Unlock()

	for filename, info := range progress {
		if info.Percentage >= 100 {
			delete(progress, filename)
		}
	}
}

func updateProgress(filename string, value float64, currentFile string) {
	progressMutex.Lock()
	defer progressMutex.Unlock()

	jobsMutex.Lock()
	jobInfo, exists := jobs[filename]
	jobsMutex.Unlock()

	paused := false
	if exists {
		paused = jobInfo.Paused
	}

	if existingProgress, ok := progress[filename]; ok {
		existingProgress.Percentage = value
		existingProgress.CurrentFile = currentFile
		existingProgress.Paused = paused
	} else {
		progress[filename] = &ProgressInfo{
			Percentage:  value,
			CurrentFile: currentFile,
			Paused:      paused,
		}
	}
	fmt.Printf("Progress updated for %s: %.2f%%, Current file: %s, Paused: %v\n", filename, value, currentFile, paused)
}