package tui

import (
	"fmt"
	"strings"

	"bee/audit/internal/platform"

	tea "github.com/charmbracelet/bubbletea"
)

func (m model) View() string {
	if m.busy {
		title := "bee"
		if m.busyTitle != "" {
			title = m.busyTitle
		}
		return fmt.Sprintf("%s\n\nWorking...\n\n[ctrl+c] quit\n", title)
	}
	switch m.screen {
	case screenMain:
		return renderMainMenu("bee", m.banner, "Select action", m.mainMenu, m.cursor)
	case screenNetwork:
		return renderMenu("Network", "Select action", m.networkMenu, m.cursor)
	case screenServices:
		return renderMenu("Services", "Select service", m.services, m.cursor)
	case screenServiceAction:
		items := make([]string, len(m.serviceMenu))
		copy(items, m.serviceMenu)
		return renderMenu("Service: "+m.selectedService, "Select action", items, m.cursor)
	case screenAcceptance:
		return renderMenu("Acceptance tests", "Select action", []string{"Run NVIDIA command pack", "Run memory test", "Run storage diagnostic pack", "Back"}, m.cursor)
	case screenExportTargets:
		title := "Export audit"
		if m.pendingAction == actionExportBundle {
			title = "Export support bundle"
		}
		return renderMenu(title, "Select removable filesystem", renderTargetItems(m.targets), m.cursor)
	case screenInterfacePick:
		return renderMenu("Interfaces", "Select interface", renderInterfaceItems(m.interfaces), m.cursor)
	case screenStaticForm:
		return renderForm("Static IPv4: "+m.selectedIface, m.formFields, m.formIndex)
	case screenConfirm:
		title, body := m.confirmBody()
		return renderConfirm(title, body, m.cursor)
	case screenOutput:
		return fmt.Sprintf("%s\n\n%s\n\n[enter/esc] back  [ctrl+c] quit\n", m.title, strings.TrimSpace(m.body))
	default:
		return "bee\n"
	}
}

func (m model) confirmBody() (string, string) {
	switch m.pendingAction {
	case actionExportAudit:
		if m.selectedTarget == nil {
			return "Export audit", "No target selected"
		}
		return "Export audit", fmt.Sprintf("Copy latest audit JSON to %s?", m.selectedTarget.Device)
	case actionExportBundle:
		if m.selectedTarget == nil {
			return "Export support bundle", "No target selected"
		}
		return "Export support bundle", fmt.Sprintf("Copy support bundle archive to %s?", m.selectedTarget.Device)
	case actionRunNvidiaSAT:
		return "NVIDIA SAT", "Run NVIDIA acceptance command pack?"
	case actionRunMemorySAT:
		return "Memory SAT", "Run runtime memory test with memtester?"
	case actionRunStorageSAT:
		return "Storage SAT", "Run storage diagnostic pack and start short self-tests where supported?"
	default:
		return "Confirm", "Proceed?"
	}
}

func renderTargetItems(targets []platform.RemovableTarget) []string {
	items := make([]string, 0, len(targets))
	for _, target := range targets {
		desc := fmt.Sprintf("%s [%s %s]", target.Device, target.FSType, target.Size)
		if target.Label != "" {
			desc += " label=" + target.Label
		}
		if target.Mountpoint != "" {
			desc += " mounted=" + target.Mountpoint
		}
		items = append(items, desc)
	}
	return items
}

func renderInterfaceItems(interfaces []platform.InterfaceInfo) []string {
	items := make([]string, 0, len(interfaces))
	for _, iface := range interfaces {
		label := iface.Name
		if len(iface.IPv4) > 0 {
			label += " [" + strings.Join(iface.IPv4, ", ") + "]"
		}
		items = append(items, label)
	}
	return items
}

func renderMenu(title, subtitle string, items []string, cursor int) string {
	var body strings.Builder
	fmt.Fprintf(&body, "%s\n\n%s\n\n", title, subtitle)
	if len(items) == 0 {
		body.WriteString("(no items)\n")
	} else {
		for i, item := range items {
			prefix := "  "
			if i == cursor {
				prefix = "> "
			}
			fmt.Fprintf(&body, "%s%s\n", prefix, item)
		}
	}
	body.WriteString("\n[↑/↓] move  [enter] select  [esc] back  [ctrl+c] quit\n")
	return body.String()
}

func renderMainMenu(title, banner, subtitle string, items []string, cursor int) string {
	var body strings.Builder
	fmt.Fprintf(&body, "%s\n\n", title)
	if banner != "" {
		body.WriteString(strings.TrimSpace(banner))
		body.WriteString("\n\n")
	}
	body.WriteString(subtitle)
	body.WriteString("\n\n")
	if len(items) == 0 {
		body.WriteString("(no items)\n")
	} else {
		for i, item := range items {
			prefix := "  "
			if i == cursor {
				prefix = "> "
			}
			fmt.Fprintf(&body, "%s%s\n", prefix, item)
		}
	}
	body.WriteString("\n[↑/↓] move  [enter] select  [esc] back  [ctrl+c] quit\n")
	return body.String()
}

func renderForm(title string, fields []formField, idx int) string {
	var body strings.Builder
	fmt.Fprintf(&body, "%s\n\n", title)
	for i, field := range fields {
		prefix := "  "
		if i == idx {
			prefix = "> "
		}
		fmt.Fprintf(&body, "%s%s: %s\n", prefix, field.Label, field.Value)
	}
	body.WriteString("\n[tab/↑/↓] move  [enter] next/submit  [backspace] delete  [esc] cancel\n")
	return body.String()
}

func renderConfirm(title, body string, cursor int) string {
	options := []string{"Confirm", "Cancel"}
	var out strings.Builder
	fmt.Fprintf(&out, "%s\n\n%s\n\n", title, body)
	for i, option := range options {
		prefix := "  "
		if i == cursor {
			prefix = "> "
		}
		fmt.Fprintf(&out, "%s%s\n", prefix, option)
	}
	out.WriteString("\n[←/→/↑/↓] move  [enter] select  [esc] cancel\n")
	return out.String()
}

func resultCmd(title, body string, err error, back screen) tea.Cmd {
	return func() tea.Msg {
		return resultMsg{title: title, body: body, err: err, back: back}
	}
}