package tools

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

func TestJail(t *testing.T) {
	root := t.TempDir()
	writeFile(t, root, "inside/file.go", "package inside\n")

	outside := t.TempDir()
	secret := writeFile(t, outside, "secret.env", "TOKEN=hunter2\n")

	// A symlink inside the root pointing out of it is the interesting case:
	// the path looks fine until it is resolved.
	link := filepath.Join(root, "escape")
	if err := os.Symlink(outside, link); err != nil {
		t.Skipf("symlinks unavailable: %v", err)
	}

	tests := []struct {
		name    string
		path    string
		wantErr bool
	}{
		{name: "relative inside", path: "inside/file.go"},
		{name: "absolute inside", path: filepath.Join(root, "inside/file.go")},
		{name: "a file that does not exist yet", path: "inside/new.go"},
		{name: "nested path that does not exist yet", path: "a/b/c/new.go"},
		{name: "dot-dot escape", path: "../escaped.go", wantErr: true},
		{name: "buried dot-dot escape", path: "inside/../../escaped.go", wantErr: true},
		{name: "absolute path outside", path: secret, wantErr: true},
		{name: "through a symlink pointing outside", path: "escape/secret.env", wantErr: true},
		{name: "the root itself", path: "."},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got, err := resolve(root, tc.path)
			if tc.wantErr {
				if err == nil {
					t.Fatalf("resolve(%q) = %q, want a refusal", tc.path, got)
				}
				if !strings.Contains(err.Error(), "outside the working root") {
					t.Errorf("error = %v, want it to explain the jail", err)
				}
				return
			}
			if err != nil {
				t.Fatalf("resolve(%q): %v", tc.path, err)
			}
		})
	}
}

func TestToolsRefuseToEscapeTheRoot(t *testing.T) {
	root := t.TempDir()
	outside := t.TempDir()
	secret := writeFile(t, outside, "secret.env", "TOKEN=hunter2\n")
	track := newTracker()

	tools := []struct {
		name string
		tool Tool
		args any
	}{
		{name: "read_file", tool: NewRead(root, track), args: ReadArgs{Path: secret}},
		{name: "edit_file", tool: NewEdit(root, track), args: EditArgs{Path: secret, OldStr: "TOKEN", NewStr: "X"}},
		{name: "write_file", tool: NewWrite(root, track), args: WriteArgs{Path: secret, Content: "x"}},
		{name: "glob", tool: NewGlob(root), args: GlobArgs{Pattern: "*.env", Path: outside}},
		{name: "grep", tool: NewGrep(root), args: GrepArgs{Pattern: "TOKEN", Path: outside}},
	}
	for _, tc := range tools {
		t.Run(tc.name, func(t *testing.T) {
			if _, err := run(t, tc.tool, tc.args); err == nil {
				t.Fatal("want a refusal for a path outside the root")
			}
		})
	}
	if got, _ := os.ReadFile(secret); string(got) != "TOKEN=hunter2\n" {
		t.Error("the file outside the root was modified")
	}
}