package tui

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"

	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
)

type snippetFormMode int

const (
	snippetFormAdd snippetFormMode = iota
	snippetFormEdit
)

type snippetFieldID int

const (
	snippetFieldName snippetFieldID = iota
	snippetFieldCommand
	snippetFieldDescription
	snippetFieldTags
	snippetFieldCount
)

var snippetFieldLabels = map[snippetFieldID]string{
	snippetFieldName:        "Name",
	snippetFieldCommand:     "Command",
	snippetFieldDescription: "Description",
	snippetFieldTags:        "Tags (comma-separated)",
}

// SnippetFormTab is a tab for adding/editing command snippets
type SnippetFormTab struct {
	mode    snippetFormMode
	editing *models.Snippet
	dataDir string

	inputs []textinput.Model
	focus  snippetFieldID
	width  int
	height int

	err   error
	saved bool
}

func NewAddSnippetFormTab(dataDir string) *SnippetFormTab {
	return newSnippetFormTab(snippetFormAdd, nil, dataDir)
}

func NewEditSnippetFormTab(snippet *models.Snippet, dataDir string) *SnippetFormTab {
	return newSnippetFormTab(snippetFormEdit, snippet, dataDir)
}

func newSnippetFormTab(mode snippetFormMode, sn *models.Snippet, dataDir string) *SnippetFormTab {
	inputs := make([]textinput.Model, snippetFieldCount)
	for i := range inputs {
		inputs[i] = textinput.New()
		inputs[i].Prompt = ""
	}

	inputs[snippetFieldName].Placeholder = "Check logs"
	inputs[snippetFieldCommand].Placeholder = "journalctl -u nginx --no-pager -n 100"
	inputs[snippetFieldDescription].Placeholder = "View last 100 nginx log entries"
	inputs[snippetFieldTags].Placeholder = "nginx,logs,troubleshooting"

	if mode == snippetFormEdit && sn != nil {
		inputs[snippetFieldName].SetValue(sn.Name)
		inputs[snippetFieldCommand].SetValue(sn.Command)
		inputs[snippetFieldDescription].SetValue(sn.Description)
		inputs[snippetFieldTags].SetValue(strings.Join(sn.Tags, ","))
	}

	inputs[snippetFieldName].Focus()
	inputs[snippetFieldName].Prompt = "> "

	return &SnippetFormTab{
		mode:    mode,
		editing: sn,
		dataDir: dataDir,
		inputs:  inputs,
	}
}

func (t *SnippetFormTab) Name() string {
	if t.mode == snippetFormEdit {
		return "Edit Snippet"
	}
	return "Add Snippet"
}

func (t *SnippetFormTab) Init() tea.Cmd {
	return textinput.Blink
}

func (t *SnippetFormTab) Update(msg tea.Msg) (Tab, tea.Cmd) {
	if t.saved {
		return t, nil
	}

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		t.width = msg.Width
		t.height = msg.Height

	case tea.KeyMsg:
		switch msg.String() {
		case "esc":
			return t, func() tea.Msg { return closeFormMsg{} }

		case "enter":
			if t.focus == snippetFieldCount-1 {
				return t.submit()
			}
			t.nextField()

		case "tab", "down":
			t.nextField()

		case "shift+tab", "up":
			t.prevField()

		case "ctrl+s":
			return t.submit()

		default:
			var cmd tea.Cmd
			t.inputs[t.focus], cmd = t.inputs[t.focus].Update(msg)
			return t, cmd
		}
	}

	return t, nil
}

func (t *SnippetFormTab) nextField() {
	t.inputs[t.focus].Blur()
	t.inputs[t.focus].Prompt = ""
	t.focus++
	if t.focus >= snippetFieldCount {
		t.focus = snippetFieldCount - 1
	}
	t.inputs[t.focus].Focus()
	t.inputs[t.focus].Prompt = "> "
}

func (t *SnippetFormTab) prevField() {
	t.inputs[t.focus].Blur()
	t.inputs[t.focus].Prompt = ""
	t.focus--
	if t.focus < 0 {
		t.focus = 0
	}
	t.inputs[t.focus].Focus()
	t.inputs[t.focus].Prompt = "> "
}

func (t *SnippetFormTab) submit() (Tab, tea.Cmd) {
	name := t.inputs[snippetFieldName].Value()
	command := t.inputs[snippetFieldCommand].Value()

	if name == "" || command == "" {
		t.err = fmt.Errorf("name and command are required")
		return t, nil
	}

	var tags []string
	if tagStr := t.inputs[snippetFieldTags].Value(); tagStr != "" {
		for _, tag := range strings.Split(tagStr, ",") {
			if trimmed := strings.TrimSpace(tag); trimmed != "" {
				tags = append(tags, trimmed)
			}
		}
	}

	var sn *models.Snippet
	if t.mode == snippetFormEdit && t.editing != nil {
		sn = t.editing
		sn.Name = name
		sn.Command = command
		sn.Description = t.inputs[snippetFieldDescription].Value()
		sn.Tags = tags
	} else {
		sn = &models.Snippet{
			Name:        name,
			Command:     command,
			Description: t.inputs[snippetFieldDescription].Value(),
			Tags:        tags,
		}
	}

	t.saved = true
	return t, saveSnippetCmd(sn, t.dataDir)
}

func (t *SnippetFormTab) View() string {
	contentW := t.width - 12
	if contentW < 50 {
		contentW = 50
	}
	if contentW > 70 {
		contentW = 70
	}

	var inner strings.Builder

	title := "Add Snippet"
	if t.mode == snippetFormEdit {
		title = "Edit Snippet"
	}
	inner.WriteString(lipgloss.PlaceHorizontal(contentW, lipgloss.Center,
		lipgloss.NewStyle().Bold(true).Foreground(gbYellow).Render(title)))
	inner.WriteString("\n\n")

	if t.err != nil {
		inner.WriteString(lipgloss.PlaceHorizontal(contentW, lipgloss.Center,
			ErrorStyle.Render(fmt.Sprintf("Error: %v", t.err))))
		inner.WriteString("\n\n")
	}

	for i := snippetFieldID(0); i < snippetFieldCount; i++ {
		input := t.inputs[i]
		label := snippetFieldLabels[i]
		style := SubtitleStyle
		if i == t.focus {
			style = HighlightStyle
		}
		inner.WriteString(style.Render(label + ":"))
		inner.WriteString("\n  ")
		inner.WriteString(input.View())
		inner.WriteString("\n\n")
	}

	inner.WriteString("\n")
	inner.WriteString(lipgloss.PlaceHorizontal(contentW, lipgloss.Center,
		SubtitleStyle.Render("Ctrl+Tab:switch  Ctrl+Q:close  Tab:next  Enter:next  Ctrl+S:save  Esc:cancel")))

	box := BorderStyle.Render(inner.String())
	var b strings.Builder
	b.WriteString(lipgloss.PlaceHorizontal(t.width, lipgloss.Center, box))
	return b.String()
}

func (t *SnippetFormTab) Close() {}