package main

import (
	"fmt"

	"github.com/charmbracelet/lipgloss"
)

func (m model) View() string {
	errView := ""
	if m.err != nil {
		errView = fmt.Sprintf("\n%s", errStyle.Render(fmt.Sprintf("ERROR: %v", m.err)))
	}

	if m.state == StateLogin {
		content := ""
		if m.loginForm != nil {
			content = m.loginForm.View()
		}
		return lipgloss.Place(m.width, m.height, lipgloss.Center, lipgloss.Center,
			loginBoxStyle.Render(content+errView))
	}

	if m.state == StateSettings {
		// [수정] 스캔 중이면 로딩 화면 표시
		if m.scanning {
			return lipgloss.Place(m.width, m.height, lipgloss.Center, lipgloss.Center,
				settingsBoxStyle.Render("Scanning Wi-Fi Networks...\nPlease wait."))
		}

		content := ""
		if m.settingsForm != nil {
			content = m.settingsForm.View()
		}

		helpMsg := "\n[Enter] Select/Save   [Esc] Back/Cancel"
		box := settingsBoxStyle.Render(content + lipgloss.NewStyle().Foreground(ColorGray).Render(helpMsg))
		return lipgloss.Place(m.width, m.height, lipgloss.Center, lipgloss.Center, box+errView)
	}

	if m.state == StateTerminal {
		return ""
	}

	// Dashboard
	wifiTxt := "WiFi: Disconnected"
	if m.status.Wifi.SSID != "" {
		wifiTxt = fmt.Sprintf("WiFi: %s (%ddBm)", m.status.Wifi.SSID, m.status.Wifi.RSSI)
	}
	header := lipgloss.NewStyle().Width(m.width).Background(ColorPurple).Foreground(ColorText).Padding(0, 1).Bold(true).Render(wifiTxt)

	panelW := (m.width - 6) / 3
	if panelW < 22 {
		panelW = 22
	}
	currPanelStyle := panelBaseStyle.Copy().Width(panelW)

	renderMetric := func(label string, val float64, unit string, color lipgloss.Color) string {
		return fmt.Sprintf("%s%s", lblStyle.Render(label), lipgloss.NewStyle().Foreground(color).Bold(true).Render(fmt.Sprintf("%6.2f %s", val, unit)))
	}

	pVin := currPanelStyle.Copy().BorderForeground(ColorBlue).Render(lipgloss.JoinVertical(lipgloss.Center,
		titleStyle.Foreground(ColorBlue).Render("VIN (Input)"),
		renderMetric("VOLT:", m.status.Vin.Voltage, "V", ColorBlue),
		renderMetric("CURR:", m.status.Vin.Current, "A", ColorBlue),
		renderMetric("POWR:", m.status.Vin.Power, "W", ColorBlue),
	))

	mColor := ColorRed
	mTitle := "MAIN [OFF]"
	if m.status.Sw.MainOn {
		mColor = ColorGreen
		mTitle = "MAIN [ON]"
	}
	pMain := currPanelStyle.Copy().BorderForeground(mColor).Render(lipgloss.JoinVertical(lipgloss.Center,
		titleStyle.Foreground(mColor).Render(mTitle),
		renderMetric("VOLT:", m.status.Main.Voltage, "V", mColor),
		renderMetric("CURR:", m.status.Main.Current, "A", mColor),
		renderMetric("POWR:", m.status.Main.Power, "W", mColor),
	))

	uColor := ColorRed
	uTitle := "USB [OFF]"
	if m.status.Sw.UsbOn {
		uColor = ColorGreen
		uTitle = "USB [ON]"
	}
	pUsb := currPanelStyle.Copy().BorderForeground(uColor).Render(lipgloss.JoinVertical(lipgloss.Center,
		titleStyle.Foreground(uColor).Render(uTitle),
		renderMetric("VOLT:", m.status.Usb.Voltage, "V", uColor),
		renderMetric("CURR:", m.status.Usb.Current, "A", uColor),
		renderMetric("POWR:", m.status.Usb.Power, "W", uColor),
	))

	panels := lipgloss.PlaceHorizontal(m.width, lipgloss.Center, lipgloss.JoinHorizontal(lipgloss.Top, pVin, pMain, pUsb))
	help := lipgloss.NewStyle().Foreground(ColorGray).Render(" [Enter] Terminal   [s] Settings   [u] Toggle USB   [m] Toggle Main   [q] Quit")
	footer := lipgloss.PlaceHorizontal(m.width, lipgloss.Center, help)

	return lipgloss.JoinVertical(lipgloss.Left, header, "\n\n", panels, "\n\n", footer+errView)
}