package miner

import (
	"os/exec"
	"runtime"
	"testing"
)

func mockVersionOKCmd(_ string, args ...string) *exec.Cmd {
	if runtime.GOOS == "windows" {
		if len(args) >= 2 && args[0] == "version" && args[1] == "--format" {
			return exec.Command("cmd", "/c", "echo", "24.0.1")
		}
		return exec.Command("cmd", "/c", "exit", "0")
	}
	if len(args) >= 2 && args[0] == "version" && args[1] == "--format" {
		return exec.Command("sh", "-c", "echo 24.0.1")
	}
	return exec.Command("true")
}

func mockVersionPodmanCmd(_ string, args ...string) *exec.Cmd {
	if runtime.GOOS == "windows" {
		if len(args) >= 2 && args[0] == "version" && args[1] == "--format" {
			return exec.Command("cmd", "/c", "echo", "4.9.0")
		}
		return exec.Command("cmd", "/c", "exit", "0")
	}
	if len(args) >= 2 && args[0] == "version" && args[1] == "--format" {
		return exec.Command("sh", "-c", "echo 4.9.0")
	}
	return exec.Command("true")
}

func TestDetectContainerRuntimePrefersDocker(t *testing.T) {
	SetContainerRuntimeProbes(
		func(name string) (string, error) {
			if name == "docker" {
				return "/usr/bin/docker", nil
			}
			if name == "podman" {
				return "/usr/bin/podman", nil
			}
			return "", exec.ErrNotFound
		},
		mockVersionOKCmd,
	)
	defer SetContainerRuntimeProbes(nil, nil)

	rt := DetectContainerRuntime()
	if !rt.Available || rt.CLI != "docker" {
		t.Fatalf("runtime=%+v want docker", rt)
	}
	if rt.Version != "24.0.1" {
		t.Fatalf("version=%q", rt.Version)
	}
}

func TestDetectContainerRuntimeFallsBackToPodman(t *testing.T) {
	SetContainerRuntimeProbes(
		func(name string) (string, error) {
			if name == "podman" {
				return "/usr/bin/podman", nil
			}
			return "", exec.ErrNotFound
		},
		mockVersionPodmanCmd,
	)
	defer SetContainerRuntimeProbes(nil, nil)

	rt := DetectContainerRuntime()
	if !rt.Available || rt.CLI != "podman" {
		t.Fatalf("runtime=%+v want podman", rt)
	}
	if rt.Version != "4.9.0" {
		t.Fatalf("version=%q", rt.Version)
	}
}

func TestDetectContainerRuntimeUnavailable(t *testing.T) {
	SetContainerRuntimeProbes(
		func(string) (string, error) { return "", exec.ErrNotFound },
		nil,
	)
	defer SetContainerRuntimeProbes(nil, nil)

	rt := DetectContainerRuntime()
	if rt.Available || rt.CLI != "" {
		t.Fatalf("runtime=%+v want unavailable", rt)
	}
}