package video

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

func argsContain(args []string, want ...string) bool {
	for _, w := range want {
		found := false
		for _, a := range args {
			if a == w {
				found = true
				break
			}
		}
		if !found {
			return false
		}
	}
	return true
}

func TestRemuxArgs(t *testing.T) {
	args := RemuxArgs("in.mkv", "out.mp4")
	if !argsContain(args, "-c", "copy", "-movflags", "+faststart", "-map", "0:a:0?") {
		t.Fatalf("remux args = %v", args)
	}
}

func TestTranscodeArgs(t *testing.T) {
	args := TranscodeArgs("in.mov", "out.mp4", MaxLongSide)
	if !argsContain(args, "libx264", "yuv420p", "aac", "-movflags", "+faststart") {
		t.Fatalf("transcode args = %v", args)
	}
	var scale string
	for i, a := range args {
		if a == "-vf" && i+1 < len(args) {
			scale = args[i+1]
		}
	}
	if !strings.Contains(scale, "min(1920,iw)") || !strings.Contains(scale, "force_divisible_by=2") {
		t.Fatalf("scale filter = %q", scale)
	}
}

func TestPosterArgs(t *testing.T) {
	args := PosterArgs("in.mp4", "poster.jpg", 1)
	if !argsContain(args, "-ss", "1", "-frames:v", "1", "-f", "image2") {
		t.Fatalf("poster args = %v", args)
	}
}

func TestRun(t *testing.T) {
	dir := t.TempDir()
	ok := filepath.Join(dir, "ok")
	if err := os.WriteFile(ok, []byte("#!/bin/sh\nexit 0\n"), 0o755); err != nil {
		t.Fatalf("write ok: %v", err)
	}
	if err := Run(context.Background(), ok, "-i", "x"); err != nil {
		t.Fatalf("run ok: %v", err)
	}
	bad := filepath.Join(dir, "bad")
	if err := os.WriteFile(bad, []byte("#!/bin/sh\necho nope >&2\nexit 3\n"), 0o755); err != nil {
		t.Fatalf("write bad: %v", err)
	}
	if err := Run(context.Background(), bad); err == nil || !strings.Contains(err.Error(), "nope") {
		t.Fatalf("run bad err = %v, want stderr captured", err)
	}
}