package e2e_test

import (
	"strings"
	"testing"
	"time"

	"pad/internal/editor"
	"pad/internal/test/e2e"
	"pad/internal/ui"
)

// TestEditLifecycle verifies that edits made through the editor are persisted
// when the file is closed (via GoToBrowser -> FlushAll).
//
// All state access goes through the harness's owner-side helpers: the logic
// goroutine is the sole owner of State (architecture.md §1).
func TestEditLifecycle(t *testing.T) {
	h := e2e.NewHarnessWithDefaults()
	defer h.Cleanup()

	// 1. Go to browser page
	if err := h.WithState(func(st *editor.State) { editor.GoToBrowser(nil) }); err != nil {
		t.Fatalf("GoToBrowser: %v", err)
	}
	time.Sleep(200 * time.Millisecond)

	// 2. Open File
	filename := "/notes.txt"
	if err := h.WithState(func(st *editor.State) { editor.OpenFile(filename) }); err != nil {
		t.Fatalf("OpenFile: %v", err)
	}

	// Wait for file to load
	success := false
	for i := 0; i < 20; i++ {
		loaded, err := h.FileLoaded()
		if err != nil {
			t.Fatalf("FileLoaded: %v", err)
		}
		if loaded {
			success = true
			break
		}
		time.Sleep(100 * time.Millisecond)
	}
	if !success {
		t.Fatal("Timed out waiting for file to load")
	}

	// 3. Edit File
	// Original content of notes.txt is 198 bytes, let's append " UPDATED"
	if err := h.WithState(func(st *editor.State) { editor.HandleInsert(" UPDATED") }); err != nil {
		t.Fatalf("HandleInsert: %v", err)
	}
	time.Sleep(100 * time.Millisecond)

	// 4. Close File (Go back to browser)
	// This will trigger FlushAll()
	if err := h.WithState(func(st *editor.State) { editor.GoToBrowser(nil) }); err != nil {
		t.Fatalf("GoToBrowser: %v", err)
	}
	time.Sleep(500 * time.Millisecond) // Ensure it had time to process close

	// 5. Re-open File
	if err := h.WithState(func(st *editor.State) { editor.OpenFile(filename) }); err != nil {
		t.Fatalf("OpenFile: %v", err)
	}
	time.Sleep(1000 * time.Millisecond) // Wait for re-open and load

	// 6. Verify Edits
	fullContent, err := h.FullContent()
	if err != nil {
		t.Fatalf("Failed to reconstruct content: %v", err)
	}
	if len(fullContent) <= 198 {
		t.Errorf("Content did not persist. Length: %d, expected > 198", len(fullContent))
	}

	// 7. Verify Size on Screen (check bottom bar label)
	frame := e2e.GetLastFrame(h)
	var sizeText string
	for _, elem := range frame {
		if container, ok := elem.(ui.Container); ok {
			// The bottom bar is a container, look for labels inside
			for _, child := range container.Children {
				if label, ok := child.(ui.Label); ok {
					// The cursor position text is in the middle, containing "/"
					if len(label.Text) > 0 && label.Text[0] != '/' && strings.Contains(label.Text, "/") {
						sizeText = label.Text
					}
				}
			}
		}
	}

	expectedText := "0 / 206" // 198 original + " UPDATED" (8) = 206, cursor at top
	if sizeText != expectedText {
		t.Errorf("Bottom bar size label mismatch: got %q, expected %q", sizeText, expectedText)
	}
}