package cmd

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

func TestResolveRecipePathDirectFile(t *testing.T) {
	tmpDir := t.TempDir()
	recipePath := filepath.Join(tmpDir, "my-recipe.md")
	if err := os.WriteFile(recipePath, []byte("# Recipe\n"), 0644); err != nil {
		t.Fatal(err)
	}

	got, err := resolveRecipePath(recipePath)
	if err != nil {
		t.Fatalf("resolveRecipePath(%q) failed: %v", recipePath, err)
	}
	if got != recipePath {
		t.Errorf("resolveRecipePath() = %q, want %q", got, recipePath)
	}
}

func TestResolveRecipePathDirectFileMissing(t *testing.T) {
	_, err := resolveRecipePath("/nonexistent/recipe.md")
	if err == nil {
		t.Fatal("expected error for missing recipe file, got nil")
	}
}

func TestResolveRecipePathProjectLocal(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	// Create .grokkit/recipes with a recipe, and a .git dir for project root detection
	recipeDir := filepath.Join(tmpDir, ".grokkit", "recipes")
	if err := os.MkdirAll(recipeDir, 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.MkdirAll(filepath.Join(tmpDir, ".git"), 0755); err != nil {
		t.Fatal(err)
	}
	recipePath := filepath.Join(recipeDir, "refactor.md")
	if err := os.WriteFile(recipePath, []byte("# Refactor\n"), 0644); err != nil {
		t.Fatal(err)
	}

	got, err := resolveRecipePath("refactor")
	if err != nil {
		t.Fatalf("resolveRecipePath('refactor') failed: %v", err)
	}
	if got != recipePath {
		t.Errorf("resolveRecipePath() = %q, want %q", got, recipePath)
	}
}

func TestResolveRecipePathNotFound(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	// Create .git so findProjectRoot works, but no recipes
	if err := os.MkdirAll(filepath.Join(tmpDir, ".git"), 0755); err != nil {
		t.Fatal(err)
	}

	// Override HOME to empty dir so global fallback also fails
	oldHome := os.Getenv("HOME")
	defer func() { _ = os.Setenv("HOME", oldHome) }()
	_ = os.Setenv("HOME", tmpDir)

	_, err := resolveRecipePath("nonexistent")
	if err == nil {
		t.Fatal("expected error for nonexistent recipe, got nil")
	}
}

func TestFindProjectRoot(t *testing.T) {
	tests := []struct {
		name   string
		marker string
	}{
		{"git repo", ".git"},
		{"gitignore", ".gitignore"},
		{"grokkit dir", ".grokkit"},
		{"go module", "go.mod"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			tmpDir := t.TempDir()
			origDir, _ := os.Getwd()

			// Create a subdirectory and chdir into it
			subDir := filepath.Join(tmpDir, "sub", "deep")
			if err := os.MkdirAll(subDir, 0755); err != nil {
				t.Fatal(err)
			}
			if err := os.Chdir(subDir); err != nil {
				t.Fatal(err)
			}
			defer func() { _ = os.Chdir(origDir) }()

			// Place the marker at the root
			markerPath := filepath.Join(tmpDir, tt.marker)
			if tt.marker == ".git" || tt.marker == ".grokkit" {
				if err := os.MkdirAll(markerPath, 0755); err != nil {
					t.Fatal(err)
				}
			} else {
				if err := os.WriteFile(markerPath, []byte(""), 0644); err != nil {
					t.Fatal(err)
				}
			}

			root, err := findProjectRoot()
			if err != nil {
				t.Fatalf("findProjectRoot() failed: %v", err)
			}
			if root != tmpDir {
				t.Errorf("findProjectRoot() = %q, want %q", root, tmpDir)
			}
		})
	}
}

func TestFindProjectRootNotInProject(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	// Empty dir — no markers at all. This will walk up to / and fail.
	_, err := findProjectRoot()
	if err == nil {
		// Might succeed if a parent dir has .git — that's OK in CI
		t.Log("findProjectRoot() succeeded (likely found .git in a parent dir)")
	}
}