package main

import (
	"bufio"
	"context"
	"fmt"
	"log/slog"
	"os"
	"strconv"
	"strings"

	"gitea.kleinsense.nl/DariusKlein/kleinTodo/common"
	"github.com/urfave/cli/v3"
)

// Todo Command
func Todo() *cli.Command {
	return &cli.Command{
		Name:            "todo",
		Usage:           "print todo items and allow for updating",
		Action:          todo,
		HideHelpCommand: true,
	}
}

func todo(context context.Context, c *cli.Command) error {
	// bufio.Scanner is a great way to read user input line by line.
	scanner := bufio.NewScanner(os.Stdin)

	store, err := common.GetTodoDataStore()
	if err != nil {
		return err
	}

	todos := store.GetTodoList(cfg.Server.Credentials.Username)
	if err != nil {
		return err
	}

	// This is the main application loop for the interactive mode.
	for {
		clearScreen()
		printTodos(todos)

		fmt.Print("What would you like to do? (update, delete, add, quit) [u/d/a/q]: ")

		// Wait for and read the user's next command.
		scanner.Scan()
		command := strings.ToLower(strings.TrimSpace(scanner.Text()))

		switch command {
		case "u", "update":
			todos = handleUpdate(scanner, todos, store)
		case "d", "delete":
			todos = handleDelete(scanner, todos, store)
		case "a", "add":
			todos = handleAdd(scanner, todos, store)
		case "q", "quit":
			fmt.Println("Goodbye!")
			return nil // Exit the program
		default:
			fmt.Println("Invalid command. Please try again.")
		}
	}
}

func clearScreen() {
	fmt.Print("\033[H\033[2J")
}

func printTodos(todos []common.Todo) {
	fmt.Printf("Todo items:\n")
	for i, t := range todos {
		t.PrintIndexed(i + 1)
	}
}

// handleDelete prompts for an index and removes the item.
func handleDelete(scanner *bufio.Scanner, todos []common.Todo, store *common.BoltStore) []common.Todo {
	fmt.Print("Enter the number of the item to delete: ")
	scanner.Scan()
	input := strings.TrimSpace(scanner.Text())
	index, err := strconv.Atoi(input)

	if err != nil || index < 1 || index > len(todos) {
		fmt.Println("Invalid number. Returning to main menu.")
		return todos
	}

	removedItem := todos[index-1]

	err = store.RemoveValueFromBucket(cfg.Server.Credentials.Username, removedItem.Name)
	if err != nil {
		slog.Error(err.Error())
		return todos
	}
	fmt.Printf("Item '%s' deleted.\n", removedItem.Name)

	todos = append(todos[:index-1], todos[index:]...)
	return todos
}

// handleUpdate prompts for an index and new values.
func handleUpdate(scanner *bufio.Scanner, todos []common.Todo, store *common.BoltStore) []common.Todo {
	fmt.Print("Enter the number of the item to update: ")
	scanner.Scan()
	input := strings.TrimSpace(scanner.Text())
	index, err := strconv.Atoi(input)

	if err != nil || index < 1 || index > len(todos) {
		fmt.Println("Invalid number. Returning to main menu.")
		return todos
	}

	// Adjust for 0-based slice index
	itemToUpdate := todos[index-1]

	fmt.Printf("Updating '%s'. Press Enter to keep current value.\n", itemToUpdate.Name)

	fmt.Printf("New name [%s]: ", itemToUpdate.Name)
	scanner.Scan()
	newName := strings.TrimSpace(scanner.Text())
	if newName != "" {
		itemToUpdate.Name = newName
	}

	fmt.Printf("New description [%s]: ", itemToUpdate.Description)
	scanner.Scan()
	newDescription := strings.TrimSpace(scanner.Text())
	if newDescription != "" {
		itemToUpdate.Description = newDescription
	}

	fmt.Printf("New status [%s]: ", itemToUpdate.Status)
	scanner.Scan()
	newStatus := strings.TrimSpace(scanner.Text())
	if newStatus != "" {
		itemToUpdate.Status = newStatus
	}

	err = itemToUpdate.Store(store, cfg.Server.Credentials.Username)
	if err != nil {
		slog.Error(err.Error())
		return todos
	}

	fmt.Println("Item updated.")
	todos[index-1] = itemToUpdate
	return todos
}

// handleAdd prompts for the details of a new item.
func handleAdd(scanner *bufio.Scanner, todos []common.Todo, store *common.BoltStore) []common.Todo {
	fmt.Print("Enter the name of the new task: ")
	scanner.Scan()
	name := strings.TrimSpace(scanner.Text())

	fmt.Print("Enter the description: ")
	scanner.Scan()
	description := strings.TrimSpace(scanner.Text())

	newTodo := common.Todo{
		Name: name, Description: description, Status: common.NotStarted, Owner: cfg.Server.Credentials.Username,
	}
	err := newTodo.Store(store, cfg.Server.Credentials.Username)
	if err != nil {
		slog.Error(err.Error())
		return todos
	}

	fmt.Println("New item added.")
	return append(todos, newTodo)
}