package osexec

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

func TestFakeRunnerSuccess(t *testing.T) {
	fr := &FakeRunner{Stdout: "ok"}
	ctx := context.Background()
	out, errOut, code, err := fr.Run(ctx, "echo", "ok")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if out != "ok" || errOut != "" || code != 0 {
		t.Fatalf("expected ok, got out=%q err=%q code=%d", out, errOut, code)
	}
}

func TestExecWithFakeRunnerNonZero(t *testing.T) {
	fr := &FakeRunner{Stdout: "", Stderr: "fail", ExitCode: 2}
	ctx := context.Background()
	out, errOut, code, err := ExecWithRunner(fr, ctx, "false")
	if err == nil {
		t.Fatalf("expected ErrExitNonZero, got no error")
	}
	if e, ok := err.(ErrExitNonZero); !ok {
		t.Fatalf("expected ErrExitNonZero, got %T %v", err, err)
	} else if e.ExitCode != 2 {
		t.Fatalf("expected exit 2, got %d", e.ExitCode)
	}
	if code != 2 || out != "" || errOut != "fail" {
		t.Fatalf("mismatch output: code=%d out=%q err=%q", code, out, errOut)
	}
}

func TestExecWithFakeRunnerTimeout(t *testing.T) {
	fr := &FakeRunner{Stdout: "", Stderr: "", ExitCode: 0, Delay: 200 * time.Millisecond}
	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
	defer cancel()
	_, _, _, err := ExecWithRunner(fr, ctx, "sleep")
	if !errors.Is(err, ErrTimeout) && err != context.DeadlineExceeded && err != context.Canceled {
		t.Fatalf("expected timeout error, got: %v", err)
	}
}

func TestRedact(t *testing.T) {
	r := NewDefaultRunner([]string{"s3_secret_[a-z0-9]+"})
	// Redact function is unexported; replicate behavior
	out := "User: s3_secret_abc123 is set"
	redacted := r.redact(out)
	if strings.Contains(redacted, "s3_secret_") {
		t.Fatalf("expected redaction in %q", redacted)
	}
}

func TestTruncate(t *testing.T) {
	r := NewDefaultRunner(nil)
	r.MaxOutputBytes = 10
	long := strings.Repeat("x", 50)
	truncated, truncatedFlag := r.truncate(long)
	if !truncatedFlag {
		t.Fatalf("expected truncated flag true")
	}
	if len(truncated) > r.MaxOutputBytes+20 { // includes '... (truncated)'
		t.Fatalf("unexpected truncated length")
	}
}