package components

import (
	"github.com/calmcacil/wg-admin/internal/tui/theme"
	"strconv"
	"strings"

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

// SearchFilterType represents the type of filter
type SearchFilterType string

const (
	FilterByName   SearchFilterType = "name"
	FilterByIPv4   SearchFilterType = "ipv4"
	FilterByIPv6   SearchFilterType = "ipv6"
	FilterByStatus SearchFilterType = "status"
)

// SearchModel represents the search component
type SearchModel struct {
	input      textinput.Model
	active     bool
	filterType SearchFilterType
	matchCount int
	totalCount int
	visible    bool
}

// Styles

// Styles (using theme package)
var (
	searchBarStyle = lipgloss.NewStyle().
		Foreground(lipgloss.Color("255")).
		Background(theme.StyleBackground).
		Padding(0, 1).
		Border(lipgloss.RoundedBorder()).
		BorderForeground(theme.StyleBorder)
	searchPromptStyle = lipgloss.NewStyle().
		Foreground(lipgloss.Color("226")).
		Bold(true)
	searchFilterStyle = lipgloss.NewStyle().
		Foreground(lipgloss.Color("147"))
	searchCountStyle = lipgloss.NewStyle().
		Foreground(lipgloss.Color("241"))
	searchHelpStyle = lipgloss.NewStyle().
		Foreground(lipgloss.Color("243"))
)

// NewSearch creates a new search component
func NewSearch() *SearchModel {
	ti := textinput.New()
	ti.Placeholder = "Search clients..."
	ti.Focus()
	ti.CharLimit = 156
	ti.Width = 40
	ti.Prompt = ""

	return &SearchModel{
		input:      ti,
		active:     false,
		filterType: FilterByName,
		matchCount: 0,
		totalCount: 0,
		visible:    true,
	}
}

// Init initializes the search component
func (m *SearchModel) Init() tea.Cmd {
	return nil
}

// Update handles messages for the search component
func (m *SearchModel) Update(msg tea.Msg) (*SearchModel, tea.Cmd) {
	if !m.active {
		return m, nil
	}

	var cmd tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "esc":
			m.active = false
			m.input.Reset()
			m.matchCount = m.totalCount
			return m, nil
		case "tab":
			m.cycleFilterType()
			return m, nil
		}
	}

	m.input, cmd = m.input.Update(msg)

	return m, cmd
}

// View renders the search component
func (m *SearchModel) View() string {
	if !m.visible {
		return ""
	}

	var filterLabel string
	switch m.filterType {
	case FilterByName:
		filterLabel = "Name"
	case FilterByIPv4:
		filterLabel = "IPv4"
	case FilterByIPv6:
		filterLabel = "IPv6"
	case FilterByStatus:
		filterLabel = "Status"
	}

	searchIndicator := ""
	if m.active {
		searchIndicator = searchPromptStyle.Render("🔍 ")
	} else {
		searchIndicator = searchPromptStyle.Render("⌕ ")
	}

	filterText := searchFilterStyle.Render("[" + filterLabel + "]")
	countText := ""
	if m.totalCount > 0 {
		countText = searchCountStyle.Render(
			lipgloss.JoinHorizontal(
				lipgloss.Left,
				strings.Repeat(" ", 4),
				"Matched: ",
				m.renderCount(m.matchCount),
				"/",
				m.renderCount(m.totalCount),
			),
		)
	}

	helpText := ""
	if m.active {
		helpText = searchHelpStyle.Render(" | Tab: filter | Esc: clear")
	} else {
		helpText = searchHelpStyle.Render(" | /: search")
	}

	content := lipgloss.JoinHorizontal(
		lipgloss.Left,
		searchIndicator,
		m.input.View(),
		filterText,
		countText,
		helpText,
	)

	return searchBarStyle.Render(content)
}

// IsActive returns true if search is active
func (m *SearchModel) IsActive() bool {
	return m.active
}

// Activate activates the search
func (m *SearchModel) Activate() {
	m.active = true
	m.input.Focus()
}

// Deactivate deactivates the search
func (m *SearchModel) Deactivate() {
	m.active = false
	m.input.Reset()
	m.matchCount = m.totalCount
}

// Clear clears the search input and filter
func (m *SearchModel) Clear() {
	m.input.Reset()
	m.matchCount = m.totalCount
}

// GetQuery returns the current search query
func (m *SearchModel) GetQuery() string {
	return m.input.Value()
}

// GetFilterType returns the current filter type
func (m *SearchModel) GetFilterType() SearchFilterType {
	return m.filterType
}

// SetTotalCount sets the total number of items
func (m *SearchModel) SetTotalCount(count int) {
	m.totalCount = count
	if !m.active {
		m.matchCount = count
	}
}

// SetMatchCount sets the number of matching items
func (m *SearchModel) SetMatchCount(count int) {
	m.matchCount = count
}

// Filter filters a list of client data based on the current search query
func (m *SearchModel) Filter(clients []ClientData) []ClientData {
	query := strings.TrimSpace(m.input.Value())
	if query == "" || !m.active {
		m.matchCount = len(clients)
		return clients
	}

	var filtered []ClientData
	queryLower := strings.ToLower(query)

	for _, client := range clients {
		var matches bool

		switch m.filterType {
		case FilterByName:
			matches = strings.Contains(strings.ToLower(client.Name), queryLower)
		case FilterByIPv4:
			matches = strings.Contains(strings.ToLower(client.IPv4), queryLower)
		case FilterByIPv6:
			matches = strings.Contains(strings.ToLower(client.IPv6), queryLower)
		case FilterByStatus:
			matches = strings.Contains(strings.ToLower(client.Status), queryLower)
		}

		if matches {
			filtered = append(filtered, client)
		}
	}

	m.matchCount = len(filtered)
	return filtered
}

// HighlightMatches highlights matching text in the given value
func (m *SearchModel) HighlightMatches(value string) string {
	if !m.active {
		return value
	}

	query := strings.TrimSpace(m.input.Value())
	if query == "" {
		return value
	}

	queryLower := strings.ToLower(query)
	valueLower := strings.ToLower(value)

	index := strings.Index(valueLower, queryLower)
	if index == -1 {
		return value
	}

	matchStyle := lipgloss.NewStyle().
		Foreground(lipgloss.Color("226")).
		Background(lipgloss.Color("57")).
		Bold(true)

	before := value[:index]
	match := value[index : index+len(query)]
	after := value[index+len(query):]

	return lipgloss.JoinHorizontal(
		lipgloss.Left,
		before,
		matchStyle.Render(string(match)),
		after,
	)
}

// cycleFilterType cycles to the next filter type
func (m *SearchModel) cycleFilterType() {
	switch m.filterType {
	case FilterByName:
		m.filterType = FilterByIPv4
	case FilterByIPv4:
		m.filterType = FilterByIPv6
	case FilterByIPv6:
		m.filterType = FilterByStatus
	case FilterByStatus:
		m.filterType = FilterByName
	}
}

// renderCount renders a count number with proper styling
func (m *SearchModel) renderCount(count int) string {
	if m.matchCount == 0 && m.active && m.input.Value() != "" {
		return lipgloss.NewStyle().
			Foreground(lipgloss.Color("196")).
			Render("No matches")
	}
	return searchCountStyle.Render(string(rune('0' + count)))
}

// ClientData represents client data for filtering
type ClientData struct {
	Name   string
	IPv4   string
	IPv6   string
	Status string
}