package fields

import (
	"bubble/setup/ui"
	"fmt"
	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/sirupsen/logrus"
	"os"
	"path/filepath"
	"strings"
)

type DirSelectModel struct {
	input            textinput.Model
	label            string
	focus            int
	open             bool
	dir              string
	currentDirectory string
	options          []os.FileInfo
	optionsCount     int
}

func NewDirSelectModel(label, dir string) *DirSelectModel {
	inputModel := textinput.New()
	inputModel.SetValue(dir)
	return &DirSelectModel{
		input:            inputModel,
		label:            label,
		currentDirectory: filepath.Dir(dir),
		open:             false,
		dir:              dir,
		optionsCount:     3,
	}
}

func (m *DirSelectModel) Init() tea.Cmd {
	return textinput.Blink
}

func (m *DirSelectModel) Update(msg tea.Msg) (FieldModel, tea.Cmd) {
	var cmds []tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		if m.open {
			switch msg.String() {
			case "esc":
				m.open = false
			case "up":
				m.focus--
				if m.focus < 0 {
					m.focus = len(m.options) - 1
				}
			case "down":
				m.focus++
				if m.focus == len(m.options) {
					m.focus = 0
				}
			case "enter":
				if len(m.options) == 0 || m.focus == len(m.options) {
					return m, nil
				}
				file := m.options[m.focus]
				fileName := file.Name()
				if fileName == ".." {
					m.currentDirectory = filepath.Dir(m.currentDirectory)
					m.focus = 0
					m.RenderOptions()
					newValue := m.currentDirectory + string(filepath.Separator)
					m.input.SetValue(newValue)
					m.dir = newValue
					m.input.CursorEnd()
					return m, nil
				}
				if file.IsDir() {
					m.currentDirectory = filepath.Join(m.currentDirectory, fileName)
					newValue := m.currentDirectory + string(filepath.Separator)
					m.input.SetValue(newValue)
					m.dir = newValue
					m.input.CursorEnd()
					m.open = false
					m.focus = 0
					return m, nil
				}
			}
		} else {
			switch msg.String() {
			case "enter":
				m.open = true
				newDir := strings.TrimSpace(m.input.Value())
				if len(newDir) > 1 && strings.HasSuffix(newDir, string(filepath.Separator)) {
					newDir = strings.TrimSuffix(newDir, string(filepath.Separator))
				}
				if info, err := os.Stat(newDir); err == nil && info.IsDir() {
					m.currentDirectory = newDir
					m.dir = newDir + string(filepath.Separator)
					m.input.SetValue(m.dir)
					m.input.CursorEnd()
				} else {
					m.currentDirectory = filepath.Dir(newDir)
				}
				m.RenderOptions()
				return m, nil
			default:
				var cmd tea.Cmd
				m.input, cmd = m.input.Update(msg)
				cmds = append(cmds, cmd)
				if m.input.Value() != m.dir {
					m.dir = m.input.Value()
				}
			}
		}
	default:
		if !m.open {
			var cmd tea.Cmd
			m.input, cmd = m.input.Update(msg)
			cmds = append(cmds, cmd)
		}
	}
	return m, tea.Batch(cmds...)
}

func (m *DirSelectModel) View() string {
	res := fmt.Sprintf("%s: %s", m.label, m.input.View())
	if m.open && len(m.options) > 0 {
		visibleCount := m.optionsCount
		if visibleCount > len(m.options) {
			visibleCount = len(m.options)
		}
		half := visibleCount / 2
		start := m.focus - half
		if start < 0 {
			start = 0
		}
		end := start + visibleCount
		if end > len(m.options) {
			end = len(m.options)
			start = end - visibleCount
			if start < 0 {
				start = 0
			}
		}
		for i := start; i < end; i++ {
			file := m.options[i]
			name := file.Name()
			prefix := "\n\t"
			if m.focus == i {
				prefix += "-> "
			} else {
				prefix += "   "
			}
			if name == ".." {
				res += prefix + ui.SelectFileDirParentStyle.Render(name)
			} else if file.IsDir() {
				res += prefix + ui.SelectDirStyle.Render(name)
			} else {
				res += prefix + ui.SelectFileDirDeniedStyle.Render(name)
			}
		}
	}
	return res
}

func (m *DirSelectModel) Focus() {
	m.input.Focus()
}

func (m *DirSelectModel) Blur() {
	m.input.Blur()
}

func (m *DirSelectModel) CaptureKeys() bool {
	return m.open
}

func (m *DirSelectModel) GetLabel() string {
	return m.label
}

func (m *DirSelectModel) GetValue() interface{} {
	return m.dir
}

func (m *DirSelectModel) RenderOptions() {
	filesInDir, err := os.ReadDir(m.currentDirectory)
	if err != nil {
		logrus.Errorf("Ошибка чтения директории: %v", err)
		return
	}
	m.options = nil
	var allOptions []os.FileInfo
	if m.currentDirectory != "/" && filepath.Clean(m.currentDirectory) != "/" {
		allOptions = append(allOptions, virtualDirInfo{name: ".."})
	}
	for _, entry := range filesInDir {
		info, _ := entry.Info()
		allOptions = append(allOptions, info)
	}
	filter := ""
	if m.open {
		inputValue := strings.TrimSpace(m.input.Value())
		if inputValue != "" {
			lastPart := inputValue[strings.LastIndex(inputValue, "/")+1:]
			if lastPart != "" {
				filter = strings.ToLower(lastPart)
			}
		}
	}
	m.options = m.options[:0]
	for _, opt := range allOptions {
		name := opt.Name()
		if filter == "" || strings.HasPrefix(strings.ToLower(name), filter) || name == ".." {
			m.options = append(m.options, opt)
		}
	}

	if len(m.options) == 0 {
		m.focus = 0
		return
	}
	if m.focus >= len(m.options) {
		m.focus = len(m.options) - 1
	}
	if m.focus < 0 {
		m.focus = 0
	}
}