package pages

import (
	"log/slog"
	"strings"
	"tasksquire/common"
	"tasksquire/components/autocomplete"
	"tasksquire/components/timestampeditor"
	"tasksquire/timewarrior"

	"github.com/charmbracelet/bubbles/key"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type TimeEditorPage struct {
	common   *common.Common
	interval *timewarrior.Interval

	// Fields
	startEditor *timestampeditor.TimestampEditor
	endEditor   *timestampeditor.TimestampEditor
	tagsInput   *autocomplete.Autocomplete
	adjust      bool

	// State
	currentField int
	totalFields  int
}

func NewTimeEditorPage(com *common.Common, interval *timewarrior.Interval) *TimeEditorPage {
	// Create start timestamp editor
	startEditor := timestampeditor.New(com).
		Title("Start").
		ValueFromString(interval.Start)

	// Create end timestamp editor
	endEditor := timestampeditor.New(com).
		Title("End").
		ValueFromString(interval.End)

	// Create tags autocomplete with combinations from past intervals
	tagCombinations := com.TimeW.GetTagCombinations()
	tagsInput := autocomplete.New(tagCombinations, 3, 10)
	tagsInput.SetPlaceholder("Space separated, use \"\" for tags with spaces")
	tagsInput.SetValue(formatTags(interval.Tags))
	tagsInput.SetWidth(50)

	p := &TimeEditorPage{
		common:       com,
		interval:     interval,
		startEditor:  startEditor,
		endEditor:    endEditor,
		tagsInput:    tagsInput,
		adjust:       true, // Enable :adjust by default
		currentField: 0,
		totalFields:  4, // Updated to include adjust field
	}

	return p
}

func (p *TimeEditorPage) Init() tea.Cmd {
	// Focus the first field (tags)
	p.currentField = 0
	p.tagsInput.Focus()
	return p.tagsInput.Init()
}

func (p *TimeEditorPage) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmds []tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch {
		case key.Matches(msg, p.common.Keymap.Back):
			model, err := p.common.PopPage()
			if err != nil {
				slog.Error("page stack empty")
				return nil, tea.Quit
			}
			return model, BackCmd

		case key.Matches(msg, p.common.Keymap.Ok):
			// Save and exit
			p.saveInterval()
			model, err := p.common.PopPage()
			if err != nil {
				slog.Error("page stack empty")
				return nil, tea.Quit
			}
			return model, tea.Batch(tea.Batch(cmds...), refreshIntervals)

		case key.Matches(msg, p.common.Keymap.Next):
			// Move to next field
			p.blurCurrentField()
			p.currentField = (p.currentField + 1) % p.totalFields
			cmds = append(cmds, p.focusCurrentField())

		case key.Matches(msg, p.common.Keymap.Prev):
			// Move to previous field
			p.blurCurrentField()
			p.currentField = (p.currentField - 1 + p.totalFields) % p.totalFields
			cmds = append(cmds, p.focusCurrentField())
		}

	case tea.WindowSizeMsg:
		p.SetSize(msg.Width, msg.Height)
	}

	// Update the currently focused field
	var cmd tea.Cmd
	switch p.currentField {
	case 0:
		var model tea.Model
		model, cmd = p.tagsInput.Update(msg)
		if ac, ok := model.(*autocomplete.Autocomplete); ok {
			p.tagsInput = ac
		}
	case 1:
		var model tea.Model
		model, cmd = p.startEditor.Update(msg)
		if editor, ok := model.(*timestampeditor.TimestampEditor); ok {
			p.startEditor = editor
		}
	case 2:
		var model tea.Model
		model, cmd = p.endEditor.Update(msg)
		if editor, ok := model.(*timestampeditor.TimestampEditor); ok {
			p.endEditor = editor
		}
	case 3:
		// Handle adjust toggle with space/enter
		if msg, ok := msg.(tea.KeyMsg); ok {
			if msg.String() == " " || msg.String() == "enter" {
				p.adjust = !p.adjust
			}
		}
	}
	cmds = append(cmds, cmd)

	return p, tea.Batch(cmds...)
}

func (p *TimeEditorPage) focusCurrentField() tea.Cmd {
	switch p.currentField {
	case 0:
		p.tagsInput.Focus()
		return p.tagsInput.Init()
	case 1:
		return p.startEditor.Focus()
	case 2:
		return p.endEditor.Focus()
	case 3:
		// Adjust checkbox doesn't need focus action
		return nil
	}
	return nil
}

func (p *TimeEditorPage) blurCurrentField() {
	switch p.currentField {
	case 0:
		p.tagsInput.Blur()
	case 1:
		p.startEditor.Blur()
	case 2:
		p.endEditor.Blur()
	case 3:
		// Adjust checkbox doesn't need blur action
	}
}

func (p *TimeEditorPage) View() string {
	var sections []string

	// Title
	titleStyle := p.common.Styles.Form.Focused.Title
	sections = append(sections, titleStyle.Render("Edit Time Interval"))
	sections = append(sections, "")

	// Tags input (now first)
	tagsLabelStyle := p.common.Styles.Form.Focused.Title
	tagsLabel := tagsLabelStyle.Render("Tags")
	if p.currentField == 0 {
		sections = append(sections, tagsLabel)
		sections = append(sections, p.tagsInput.View())
		descStyle := p.common.Styles.Form.Focused.Description
		sections = append(sections, descStyle.Render("Space separated, use \"\" for tags with spaces"))
	} else {
		blurredLabelStyle := p.common.Styles.Form.Blurred.Title
		sections = append(sections, blurredLabelStyle.Render("Tags"))
		sections = append(sections, lipgloss.NewStyle().Faint(true).Render(p.tagsInput.GetValue()))
	}

	sections = append(sections, "")
	sections = append(sections, "")

	// Start editor
	sections = append(sections, p.startEditor.View())
	sections = append(sections, "")

	// End editor
	sections = append(sections, p.endEditor.View())
	sections = append(sections, "")

	// Adjust checkbox
	adjustLabelStyle := p.common.Styles.Form.Focused.Title
	adjustLabel := adjustLabelStyle.Render("Adjust overlaps")

	var checkbox string
	if p.adjust {
		checkbox = "[X]"
	} else {
		checkbox = "[ ]"
	}

	if p.currentField == 3 {
		focusedStyle := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("12"))
		sections = append(sections, adjustLabel)
		sections = append(sections, focusedStyle.Render(checkbox+" Auto-adjust overlapping intervals"))
		descStyle := p.common.Styles.Form.Focused.Description
		sections = append(sections, descStyle.Render("Press space to toggle"))
	} else {
		blurredLabelStyle := p.common.Styles.Form.Blurred.Title
		sections = append(sections, blurredLabelStyle.Render("Adjust overlaps"))
		sections = append(sections, lipgloss.NewStyle().Faint(true).Render(checkbox+" Auto-adjust overlapping intervals"))
	}

	sections = append(sections, "")
	sections = append(sections, "")

	// Help text
	helpStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("8"))
	sections = append(sections, helpStyle.Render("tab/shift+tab: navigate • enter: save • esc: cancel"))

	return lipgloss.JoinVertical(lipgloss.Left, sections...)
}

func (p *TimeEditorPage) SetSize(width, height int) {
	p.common.SetSize(width, height)
}

func (p *TimeEditorPage) saveInterval() {
	// If it's an existing interval (has ID), delete it first so we can replace it with the modified version
	if p.interval.ID != 0 {
		err := p.common.TimeW.DeleteInterval(p.interval.ID)
		if err != nil {
			slog.Error("Failed to delete old interval during edit", "err", err)
			// Proceeding to import anyway, attempting to save user data
		}
	}

	p.interval.Start = p.startEditor.GetValueString()
	p.interval.End = p.endEditor.GetValueString()

	// Parse tags
	p.interval.Tags = parseTags(p.tagsInput.GetValue())

	err := p.common.TimeW.ModifyInterval(p.interval, p.adjust)
	if err != nil {
		slog.Error("Failed to modify interval", "err", err)
	}
}

func parseTags(tagsStr string) []string {
	var tags []string
	var current strings.Builder
	inQuotes := false

	for _, r := range tagsStr {
		switch {
		case r == '"':
			inQuotes = !inQuotes
		case r == ' ' && !inQuotes:
			if current.Len() > 0 {
				tags = append(tags, current.String())
				current.Reset()
			}
		default:
			current.WriteRune(r)
		}
	}
	if current.Len() > 0 {
		tags = append(tags, current.String())
	}
	return tags
}

func formatTags(tags []string) string {
	var formatted []string
	for _, t := range tags {
		if strings.Contains(t, " ") {
			formatted = append(formatted, "\""+t+"\"")
		} else {
			formatted = append(formatted, t)
		}
	}
	return strings.Join(formatted, " ")
}