package ui

import (
	"fmt"
	"strings"
	"time"

	"github.com/charmbracelet/lipgloss"

	"skyrama-tui/internal/model"
	"skyrama-tui/internal/style"
)

// AirportView renders the full airport overview panel.
// Uses a single panel with two sections to avoid nested-panel line-count overhead.
func AirportView(airport *model.Airport, country string, width int) string {
	if airport == nil {
		return lipgloss.JoinVertical(lipgloss.Left,
			style.PanelHeader.Render("🛫  Airport"),
			"",
			style.Muted.Render("No airport found for your account."),
			style.Muted.Render("Ask an admin to create one, or use the db_manager tool."),
		)
	}

	barW := 22

	fuelBar := style.ResourceBar(
		int(airport.CurrentFuel), atLeast1(int(airport.MaxFuelCapacity)), barW, style.ColorFuel)
	fuelLine := row(
		style.FuelChip.Width(14).Render("⛽ Fuel"),
		fuelBar,
		style.Muted.Render(fmt.Sprintf("  %d / %d", airport.CurrentFuel, airport.MaxFuelCapacity)),
		style.Muted.Render(fmt.Sprintf("  +%d/min", airport.FuelGenerationRate)),
	)

	paxBar := style.ResourceBar(
		int(airport.CurrentPassengers), atLeast1(int(airport.MaxPassengerCapacity)), barW, style.ColorPassenger)
	paxLine := row(
		style.PassengerChip.Width(14).Render("👤 Passengers"),
		paxBar,
		style.Muted.Render(fmt.Sprintf("  %d / %d", airport.CurrentPassengers, airport.MaxPassengerCapacity)),
		style.Muted.Render(fmt.Sprintf("  +%d/min", airport.PassengerGenerationRate)),
	)

	cashLine := style.CashChip.Render(fmt.Sprintf("💰 Cash          $%s", formatCash(airport.Cash)))

	xpNeeded := model.XPToNextLevel(airport.PlayerLevel)
	xpCurrent := model.XPIntoLevel(airport.PlayerLevel, airport.ExperiencePoints)
	xpBar := style.ResourceBar(xpCurrent, atLeast1(xpNeeded), barW, style.ColorGreen)
	xpLine := row(
		style.Bold.Width(14).Render("✨ XP"),
		xpBar,
		style.Muted.Render(fmt.Sprintf("  %d / %d", xpCurrent, xpNeeded)),
	)

	avail := style.StatusIdle.Render("Open  ✓")
	if !airport.IsAvailable {
		avail = style.StatusMaint.Render("Closed ✗")
	}

	sinceSec := time.Since(airport.ResourcesLastUpdatedAt)
	syncStr := "just now"
	if sinceSec >= time.Second {
		syncStr = sinceSec.Round(time.Second).String() + " ago"
	}

	// Single panel containing both sections — avoids double-border line overhead.
	panel := style.Panel.Width(width).Render(lipgloss.JoinVertical(lipgloss.Left,
		style.PanelHeader.Render("Resources"),
		fuelLine,
		paxLine,
		cashLine,
		xpLine,
		"",
		style.PanelHeader.Render("Airport Info"),
		kv("Name", airport.Name),
		kv("Country", country),
		kv("Level", fmt.Sprintf("Lv.%d", airport.PlayerLevel)),
		kv("Status", avail),
		kv("Last sync", syncStr),
	))

	// 1-line header to keep total view height minimal.
	header := lipgloss.JoinHorizontal(lipgloss.Top,
		style.Bold.Foreground(style.ColorSky).Width(width/2).Render("🛫  "+airport.Name),
		style.Muted.Width(width/2).Align(lipgloss.Right).
			Render(fmt.Sprintf("Lv.%d  📍 %s", airport.PlayerLevel, country)),
	)

	return lipgloss.JoinVertical(lipgloss.Left, header, panel)
}

// ─── Helpers ──────────────────────────────────────────────────────────────────

func row(parts ...string) string {
	return lipgloss.JoinHorizontal(lipgloss.Top, parts...)
}

func kv(key, val string) string {
	return lipgloss.JoinHorizontal(lipgloss.Top,
		style.Muted.Width(14).Render(key+":"),
		val,
	)
}

func formatCash(v uint64) string {
	s := fmt.Sprintf("%d", v)
	var b strings.Builder
	for i, ch := range s {
		if i > 0 && (len(s)-i)%3 == 0 {
			b.WriteRune(',')
		}
		b.WriteRune(ch)
	}
	return b.String()
}

// atLeast1 prevents division-by-zero in progress bar calculations.
func atLeast1(n int) int {
	if n <= 0 {
		return 1
	}
	return n
}