package main

import (
	"os"
	"path/filepath"
	"testing"
)

func TestListProjects(t *testing.T) {
	dir := t.TempDir()

	// Create test projects
	os.MkdirAll(filepath.Join(dir, "alpha"), 0755)
	os.MkdirAll(filepath.Join(dir, "beta"), 0755)
	os.MkdirAll(filepath.Join(dir, ".hidden"), 0755)
	os.WriteFile(filepath.Join(dir, "file.txt"), []byte("not a dir"), 0644)

	// Add README to alpha
	os.WriteFile(filepath.Join(dir, "alpha", "README.md"), []byte("# Alpha Project\nSome description"), 0644)

	t.Run("lists directories only", func(t *testing.T) {
		projects, err := ListProjects(dir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		if len(projects) != 2 {
			t.Fatalf("got %d projects, want 2", len(projects))
		}
	})

	t.Run("sorted alphabetically", func(t *testing.T) {
		projects, err := ListProjects(dir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		if projects[0].Name != "alpha" {
			t.Errorf("first = %q, want alpha", projects[0].Name)
		}
		if projects[1].Name != "beta" {
			t.Errorf("second = %q, want beta", projects[1].Name)
		}
	})

	t.Run("reads README description", func(t *testing.T) {
		projects, err := ListProjects(dir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		if !projects[0].HasReadme {
			t.Error("alpha should have HasReadme=true")
		}
		if projects[0].Description != "Alpha Project" {
			t.Errorf("description = %q, want 'Alpha Project'", projects[0].Description)
		}
	})

	t.Run("no README", func(t *testing.T) {
		projects, err := ListProjects(dir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		if projects[1].HasReadme {
			t.Error("beta should have HasReadme=false")
		}
		if projects[1].Description != "" {
			t.Errorf("description = %q, want empty", projects[1].Description)
		}
	})

	t.Run("excludes hidden dirs", func(t *testing.T) {
		projects, err := ListProjects(dir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		for _, p := range projects {
			if p.Name == ".hidden" {
				t.Error("should not include hidden directories")
			}
		}
	})

	t.Run("nonexistent directory", func(t *testing.T) {
		_, err := ListProjects("/nonexistent/path")
		if err == nil {
			t.Fatal("expected error for nonexistent dir")
		}
	})

	t.Run("empty directory", func(t *testing.T) {
		emptyDir := t.TempDir()
		projects, err := ListProjects(emptyDir)
		if err != nil {
			t.Fatalf("ListProjects: %v", err)
		}
		if len(projects) != 0 {
			t.Errorf("got %d projects, want 0", len(projects))
		}
	})
}