package tui

import (
	"fmt"
	"strings"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/yeho/doks/internal/search"
)

type Model struct {
	results  []search.Result
	cursor   int
	selected *search.Result
	query    string
	quitting bool
	width    int
	height   int
}

func New(results []search.Result, query string) Model {
	return Model{
		results: results,
		cursor:  0,
		query:   query,
	}
}

func (m Model) Init() tea.Cmd {
	return nil
}

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "q", "esc":
			m.quitting = true
			return m, tea.Quit

		case "enter":
			if len(m.results) > 0 && m.cursor < len(m.results) {
				m.selected = &m.results[m.cursor]
			}
			return m, tea.Quit

		case "up", "k":
			if m.cursor > 0 {
				m.cursor--
			}

		case "down", "j":
			if m.cursor < len(m.results)-1 {
				m.cursor++
			}

		case "home", "g":
			m.cursor = 0

		case "end", "G":
			m.cursor = len(m.results) - 1
		}

	case tea.WindowSizeMsg:
		m.width = msg.Width
		m.height = msg.Height
	}

	return m, nil
}

func (m Model) View() string {
	if len(m.results) == 0 {
		return NoResultsStyle.Render(fmt.Sprintf("No results found for '%s'", m.query))
	}

	var b strings.Builder

	// Title
	title := fmt.Sprintf("Search results for '%s' (%d found)", m.query, len(m.results))
	b.WriteString(TitleStyle.Render(title))
	b.WriteString("\n\n")

	// Results
	visibleResults := m.results
	maxVisible := 10
	if len(visibleResults) > maxVisible {
		// Show results around cursor
		start := m.cursor - maxVisible/2
		if start < 0 {
			start = 0
		}
		end := start + maxVisible
		if end > len(visibleResults) {
			end = len(visibleResults)
			start = end - maxVisible
			if start < 0 {
				start = 0
			}
		}
		visibleResults = m.results[start:end]
	}

	for i, result := range m.results {
		// Check if this result is visible
		visible := false
		for _, vr := range visibleResults {
			if vr.Key == result.Key && vr.LineNumber == result.LineNumber {
				visible = true
				break
			}
		}
		if !visible {
			continue
		}

		isSelected := i == m.cursor

		// Cursor indicator
		cursor := "  "
		if isSelected {
			cursor = CursorStyle.Render("> ")
		}

		// Key - bold and bright (even brighter when selected)
		var key string
		if isSelected {
			key = KeyStyleSelected.Render(result.Key)
		} else {
			key = KeyStyle.Render(result.Key)
		}

		// Line number - dimmer
		var lineNum string
		if isSelected {
			lineNum = LineNumStyleSelected.Render(fmt.Sprintf(":%d", result.LineNumber))
		} else {
			lineNum = LineNumStyle.Render(fmt.Sprintf(":%d", result.LineNumber))
		}

		// Truncate line text if too long
		lineText := result.LineText
		maxLineLen := 50
		if len(lineText) > maxLineLen {
			lineText = lineText[:maxLineLen-3] + "..."
		}

		// Match text - dimmer than key
		var matchText string
		if isSelected {
			matchText = MatchTextStyleSelected.Render(lineText)
		} else {
			matchText = MatchTextStyle.Render(lineText)
		}

		line := fmt.Sprintf("%s%s%s  %s", cursor, key, lineNum, matchText)
		b.WriteString(line)
		b.WriteString("\n")
	}

	// Help
	help := "↑/k up • ↓/j down • enter select • q/esc quit"
	b.WriteString(HelpStyle.Render(help))

	return b.String()
}

func (m Model) Selected() *search.Result {
	return m.selected
}

func (m Model) Quitting() bool {
	return m.quitting
}

func Run(results []search.Result, query string) (*search.Result, error) {
	model := New(results, query)
	p := tea.NewProgram(model)

	finalModel, err := p.Run()
	if err != nil {
		return nil, err
	}

	m := finalModel.(Model)
	return m.Selected(), nil
}