package main

import (
	"fmt"
	"strings"

	"charm.land/bubbles/v2/progress"
	tea "charm.land/bubbletea/v2"
	"charm.land/lipgloss/v2"
)

func (m model) View() tea.View {
	view := tea.NewView(view(m))

	view.AltScreen = true

	return view
}

func view(m model) string {
	if m.width == 0 || m.height == 0 {
		return "Loading..."
	}

	if m.err != nil {
		return fmt.Sprintf("Error: %v\n\nPress q to quit.", m.err)
	}

	var b strings.Builder

	renderQuery(&b, m)

	if len(m.filtered) == 0 {
		b.WriteString("  No services found.\n")
		renderHelp(&b, m)
		return b.String()
	}

	b.WriteString(lipgloss.JoinHorizontal(lipgloss.Left, renderList(m), renderDetails(m)))

	renderHelp(&b, m)

	return b.String()
}

func renderQuery(b *strings.Builder, m model) {
	b.WriteString(m.query.View())
	b.WriteString("\n\n")
}

func renderHelp(b *strings.Builder, m model) {
	if height := m.height - strings.Count(b.String(), "\n") - If(m.help.ShowAll, 2, 1); height > 0 {
		b.WriteString(strings.Repeat("\n", height))
	}

	b.WriteString(m.help.View(m.keys))
}

func renderList(m model) string {
	var panel = lipgloss.NewStyle().Height(m.amount*3 - 1).Width(m.width / 2)

	var b strings.Builder

	last := min(len(m.filtered), m.offset+m.amount)

	for i := m.offset; i < last; i++ {
		s := m.filtered[i]

		cursor := " "
		if i == m.cursor {
			cursor = ">"
		}

		status := status(s.Active)

		line := fmt.Sprintf(
			"%s %s %s \n  %s\n"+If(i == last-1, "", "\n"),
			cursor, status, s.Name, s.Desc,
		)
		b.WriteString(line)
	}

	return panel.Render(b.String())
}

func renderDetails(m model) string {
	var panel = lipgloss.NewStyle().Height(m.amount*3 - 1).MaxWidth(m.width / 2)

	var b strings.Builder

	d := m.detail
	sys := m.system

	fmt.Fprintf(&b, "%s\n%s\n\n", d.Name, d.Desc)

	prog := progress.New(progress.WithColors(lipgloss.White), progress.WithFillCharacters('█', '░'), progress.WithoutPercentage())

	if d.Active == "active" {
		fmt.Fprintf(&b, "▣ Memory - %s / %s\n%s\n\n", d.Memory.Fmt, d.MemoryMax.Alt(sys.Memory).Fmt, prog.ViewAs(d.Memory.Div(d.MemoryMax.Alt(sys.Memory))))

		fmt.Fprintf(&b, "≡ Tasks - %s / %s\n%s\n\n", d.Tasks.Fmt, d.TasksMax.Alt(sys.Tasks).Fmt, prog.ViewAs(d.Tasks.Div(d.TasksMax.Alt(sys.Tasks))))

		fmt.Fprintf(&b, "⌁ CPU - %ds\n\n", int(d.Cpu))
	}

	fmt.Fprintf(&b, "%s %s / %s / %s\n", status(d.Active), d.Active, d.Load, d.Sub)

	state := If(d.Active == "active" || d.Active == "failed", 1, If(d.Active == "inactive", -1, 0))

	b.WriteString(lipgloss.NewStyle().Width(prog.Width()).Align(lipgloss.Right).Render(If(state == 1, stop, If(state == -1, start, ""))))

	return panel.Render(b.String())
}