package shell

import (
	"context"
	"runtime"
	"strings"
	"testing"
	"time"
)

func TestCallRejectsEmptyCommand(t *testing.T) {
	tool := New([]string{"echo"}, ".", time.Second, 4000, nil)
	_, err := tool.Call(context.Background(), "   ")
	if err == nil {
		t.Fatal("expected error for empty command")
	}
}

func TestCallAllowsNonAllowlistedCommand(t *testing.T) {
	tool := New([]string{"echo"}, ".", time.Second, 4000, nil)
	out, err := tool.Call(context.Background(), "go version")
	if err != nil {
		t.Fatalf("expected command to run without allowlist restriction, got err=%v", err)
	}
	if out == "" {
		t.Fatal("expected non-empty output")
	}
}

func TestCallWindowsDateIsNonInteractive(t *testing.T) {
	if runtime.GOOS != "windows" {
		t.Skip("windows-only test")
	}
	tool := New(nil, ".", 3*time.Second, 4000, nil)
	out, err := tool.Call(context.Background(), "date")
	if err != nil {
		t.Fatalf("expected bare date command to succeed on windows, got err=%v output=%q", err, out)
	}
	if strings.TrimSpace(out) == "" {
		t.Fatal("expected non-empty output for date command")
	}
}

func TestRequiresShellParsing(t *testing.T) {
	if !requiresShellParsing("echo hi | cat") {
		t.Fatal("expected pipe command to require shell parsing")
	}
	if requiresShellParsing("echo hello") {
		t.Fatal("expected simple command to not require shell parsing")
	}
}

func TestCallSupportsPipeOnUnix(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("unix-only behavior test")
	}
	tool := New([]string{"echo"}, ".", 3*time.Second, 4000, nil)
	out, err := tool.Call(context.Background(), "printf hello | wc -c")
	if err != nil {
		t.Fatalf("expected pipeline command success, got err=%v output=%q", err, out)
	}
	trimmed := strings.TrimSpace(out)
	if trimmed != "5" {
		t.Fatalf("expected output 5, got %q", trimmed)
	}
}