package tui

import (
	"fmt"
	"strings"
	"time"

	"github.com/charmbracelet/lipgloss"
)

// ErrorSeverity indicates the level of an error message
type ErrorSeverity int

const (
	SevError ErrorSeverity = iota
	SevWarning
	SevInfo
)

// ErrorBanner displays a structured error message with title, details, and hints
type ErrorBanner struct {
	Title       string
	Detail      string
	Hints       []string
	Severity    ErrorSeverity
	AutoDismiss bool
	DismissAfter time.Duration
	createdAt   time.Time
	visible     bool
}

// NewErrorBanner creates a new error banner with the given severity
func NewErrorBanner(severity ErrorSeverity) *ErrorBanner {
	return &ErrorBanner{
		Severity:     severity,
		AutoDismiss:  true,
		DismissAfter: 5 * time.Second,
		visible:      false,
	}
}

// Show displays the error banner with the given message
func (b *ErrorBanner) Show(title, detail string, hints ...string) {
	b.Title = title
	b.Detail = detail
	b.Hints = hints
	b.visible = true
	b.createdAt = time.Now()
}

// Hide hides the error banner
func (b *ErrorBanner) Hide() {
	b.visible = false
}

// IsVisible returns whether the banner is currently visible
func (b *ErrorBanner) IsVisible() bool {
	return b.visible
}

// Update checks if auto-dismiss time has elapsed
func (b *ErrorBanner) Update() {
	if b.visible && b.AutoDismiss && time.Since(b.createdAt) > b.DismissAfter {
		b.visible = false
	}
}

// View renders the error banner
func (b *ErrorBanner) View(width int) string {
	if !b.visible {
		return ""
	}

	var (
		titleStyle lipgloss.Style
		borderColor lipgloss.Color
		prefix     string
	)

	switch b.Severity {
	case SevError:
		titleStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#ea6962")).Bold(true)
		borderColor = lipgloss.Color("#ea6962")
		prefix = "✖"
	case SevWarning:
		titleStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#d8a657")).Bold(true)
		borderColor = lipgloss.Color("#d8a657")
		prefix = "⚠"
	case SevInfo:
		titleStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#7daea3")).Bold(true)
		borderColor = lipgloss.Color("#7daea3")
		prefix = "ℹ"
	}

	var sb strings.Builder

	// Title line with prefix
	sb.WriteString(titleStyle.Render(fmt.Sprintf("%s %s", prefix, b.Title)))

	// Detail line
	if b.Detail != "" {
		sb.WriteString("\n")
		sb.WriteString(strings.Repeat(" ", len(prefix)+1))
		detailStyle := lipgloss.NewStyle().Foreground(activeTheme.Fg)
		sb.WriteString(detailStyle.Render(b.Detail))
	}

	// Hints
	if len(b.Hints) > 0 {
		sb.WriteString("\n")
		sb.WriteString(strings.Repeat(" ", len(prefix)+1))
		hintStyle := lipgloss.NewStyle().Foreground(activeTheme.FgMute)
		sb.WriteString(hintStyle.Render("Hints:"))
		for i, hint := range b.Hints {
			sb.WriteString("\n")
			sb.WriteString(strings.Repeat(" ", len(prefix)+2))
			sb.WriteString(hintStyle.Render(fmt.Sprintf("%d. %s", i+1, hint)))
		}
	}

	// Wrap in a styled box
	borderStyle := lipgloss.NewStyle().
		Border(lipgloss.RoundedBorder()).
		BorderForeground(borderColor).
		Padding(0, 1).
		Width(min(width-2, 80))

	return borderStyle.Render(sb.String())
}

// min returns the smaller of two integers
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}