package tui

import (
	"fmt"
	"strings"

	"github.com/charmbracelet/lipgloss"
)

func (m Model) renderDashboard() string {
	colWidth := m.width / 2
	if colWidth < 30 {
		colWidth = 30
	}

	var left, right strings.Builder

	left.WriteString(sectionStyle.Render("System"))
	left.WriteString("\n")
	if m.scanResult != nil {
		sysInfo := m.scanResult.System.String()
		left.WriteString("  ")
		left.WriteString(lipgloss.NewStyle().Foreground(lipgloss.Color("#E0E0E0")).Render(sysInfo))
	}
	left.WriteString("\n\n")

	left.WriteString(sectionStyle.Render("Tools"))
	left.WriteString("\n")
	if m.scanResult != nil {
		installed := 0
		total := len(m.scanResult.Tools)
		for _, t := range m.scanResult.Tools {
			if t.Installed {
				installed++
				left.WriteString("  ")
				left.WriteString(itemOKStyle.Render("  "))
				left.WriteString(fmt.Sprintf(" %-12s %s\n", t.Name, extractVersion(t.Version)))
			} else {
				left.WriteString("  ")
				left.WriteString(itemMissingStyle.Render("  "))
				left.WriteString(fmt.Sprintf(" %-12s %s\n", t.Name, itemPendingStyle.Render("(not installed)")))
			}
		}
		barWidth := 20
		pct := 0
		if total > 0 {
			pct = (installed * barWidth) / total
		}
		bar := lipgloss.NewStyle().Foreground(successColor).Render(strings.Repeat("█", pct)) +
			lipgloss.NewStyle().Foreground(dimColor).Render(strings.Repeat("░", barWidth-pct))
		left.WriteString(fmt.Sprintf("\n  %s %d/%d\n", bar, installed, total))
	}
	left.WriteString("\n")

	if m.installing {
		left.WriteString(sectionStyle.Render("Installing..."))
		left.WriteString("\n")
		progBar := m.progressBar.View()
		label := ""
		if m.installTool != "" {
			label = fmt.Sprintf(" %d/%d - %s", m.installCurrent+1, m.installTotal, m.installTool)
		} else {
			label = fmt.Sprintf(" %d/%d", m.installCurrent, m.installTotal)
		}
		left.WriteString(fmt.Sprintf("  %s%s\n", progBar, label))
		left.WriteString("\n")
	}

	if len(m.installLog) > 0 {
		left.WriteString(sectionStyle.Render("Install Log"))
		left.WriteString("\n")
		for _, l := range m.installLog {
			left.WriteString(l + "\n")
		}
		left.WriteString("\n")
	}

	right.WriteString(sectionStyle.Render("Quick Actions"))
	right.WriteString("\n")
	actions := []struct {
		key  string
		desc string
	}{
		{"i", "Install missing tools"},
		{"u", "Check for updates"},
		{"s", "Rescan system"},
		{"l", "Scan LSP servers"},
		{"m", "Configure MCP servers"},
	}
	for _, a := range actions {
		right.WriteString(fmt.Sprintf("  %s %s\n",
			lipgloss.NewStyle().Foreground(baseColor).Bold(true).Render("["+a.key+"]"),
			a.desc))
	}
	right.WriteString("\n")

	if len(m.updateStatus) > 0 {
		right.WriteString(sectionStyle.Render("Updates"))
		right.WriteString("\n")
		for _, s := range m.updateStatus {
			if s.NeedsUpdate {
				right.WriteString("  ")
				right.WriteString(itemWarnStyle.Render(" "))
				right.WriteString(fmt.Sprintf(" %s: %s -> %s\n", s.Tool, s.Current, s.Latest))
			} else if s.Error == "" {
				right.WriteString("  ")
				right.WriteString(itemOKStyle.Render(" "))
				right.WriteString(fmt.Sprintf(" %s: up to date\n", s.Tool))
			}
		}
		right.WriteString("\n")
	}

	if len(m.lspServers) > 0 {
		right.WriteString(sectionStyle.Render("LSP Servers"))
		right.WriteString("\n")
		lspInstalled := 0
		for _, s := range m.lspServers {
			if s.Installed {
				lspInstalled++
				right.WriteString("  ")
				right.WriteString(itemOKStyle.Render(" "))
				right.WriteString(fmt.Sprintf(" %-22s (%s)\n", s.Name, s.Language))
			} else {
				right.WriteString("  ")
				right.WriteString(itemPendingStyle.Render(" "))
				right.WriteString(fmt.Sprintf(" %-22s (%s)\n", s.Name, s.Language))
			}
		}
		right.WriteString(fmt.Sprintf("\n  Installed: %d/%d\n", lspInstalled, len(m.lspServers)))
		right.WriteString("\n")
	}

	if m.daemon != nil {
		right.WriteString(sectionStyle.Render("Daemon"))
		right.WriteString("\n")
		if m.daemon.IsRunning() {
			right.WriteString("  ")
			right.WriteString(itemOKStyle.Render("running"))
			lastCheck := m.daemon.LastCheck()
			if !lastCheck.IsZero() {
				right.WriteString(fmt.Sprintf("  last: %s", lastCheck.Format("15:04:05")))
			}
		} else {
			right.WriteString("  ")
			right.WriteString(itemPendingStyle.Render("stopped"))
		}
		right.WriteString("\n\n")
	}

	mcpStatus := itemPendingStyle.Render("not configured")
	if m.mcpConfigured {
		mcpStatus = itemOKStyle.Render("configured")
	}
	right.WriteString(fmt.Sprintf("MCP: %s\n", mcpStatus))

	leftCol := lipgloss.NewStyle().Width(colWidth).Render(left.String())
	rightCol := lipgloss.NewStyle().Width(colWidth).Render(right.String())

	return lipgloss.JoinHorizontal(lipgloss.Top, leftCol, rightCol)
}