package compose

import (
	"context"
	"errors"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"github.com/aritmolab/thothii/tools/tht/internal/config"
)

func TestRunnerPassesEachArgumentWithoutShellSplitting(t *testing.T) {
	t.Parallel()

	runner := NewRunner(writeExecutable(t, "#!/bin/sh\nprintf '<%s>\\n' \"$@\"\ncat\n"))
	result, err := runner.Run(context.Background(), []string{"compose", "--project-directory", "/tmp/a project with spaces", "config"}, strings.NewReader("stdin value\n"))
	if err != nil {
		t.Fatalf("Run() error = %v", err)
	}
	want := "<compose>\n<--project-directory>\n</tmp/a project with spaces>\n<config>\nstdin value\n"
	if result.Stdout != want {
		t.Errorf("stdout = %q, want %q", result.Stdout, want)
	}
	if result.ExitCode != 0 {
		t.Errorf("ExitCode = %d, want 0", result.ExitCode)
	}
}

func TestRunnerReturnsTheChildExitCode(t *testing.T) {
	t.Parallel()

	runner := NewRunner(writeExecutable(t, "#!/bin/sh\necho unavailable >&2\nexit 42\n"))
	result, err := runner.Run(context.Background(), []string{"compose", "ps"}, nil)
	if err == nil {
		t.Fatal("Run() error = nil, want child exit error")
	}
	if result.ExitCode != 42 {
		t.Errorf("ExitCode = %d, want 42", result.ExitCode)
	}
	if result.Stderr != "unavailable\n" {
		t.Errorf("stderr = %q, want unavailable output", result.Stderr)
	}
}

func TestRunnerReportsMissingDocker(t *testing.T) {
	t.Parallel()

	runner := NewRunner(filepath.Join(t.TempDir(), "docker-does-not-exist"))
	result, err := runner.Run(context.Background(), []string{"compose", "version"}, nil)
	if !errors.Is(err, exec.ErrNotFound) {
		t.Fatalf("Run() error = %v, want exec.ErrNotFound", err)
	}
	if result.ExitCode != 127 {
		t.Errorf("ExitCode = %d, want 127", result.ExitCode)
	}
}

func TestInstallationRunnerAppliesComposeArgumentsWithoutRewritingHostDockerCommands(t *testing.T) {
	t.Parallel()

	recorded := &recordingRunner{}
	installation := config.Installation{
		Path:             "/tmp/thothii/deploy/local/thothii-installation.yaml",
		Profile:          "local",
		ProjectDirectory: "/tmp/thothii",
		EnvFile:          "/tmp/thothii/deploy/local/operator.env",
	}
	runner := InstallationRunner{Installation: installation, Runner: recorded}
	if _, err := runner.Run(context.Background(), []string{"compose", "ps"}, nil); err != nil {
		t.Fatal(err)
	}
	if _, err := runner.Run(context.Background(), []string{"inspect", "core-id"}, nil); err != nil {
		t.Fatal(err)
	}

	if got, want := strings.Join(recorded.calls[0], " "), strings.Join(installation.ComposeArgs("ps"), " "); got != want {
		t.Fatalf("Compose call = %q, want %q", got, want)
	}
	if got, want := strings.Join(recorded.calls[1], " "), "inspect core-id"; got != want {
		t.Fatalf("host Docker call = %q, want %q", got, want)
	}
}

type recordingRunner struct{ calls [][]string }

func (r *recordingRunner) Run(_ context.Context, args []string, _ io.Reader) (Result, error) {
	r.calls = append(r.calls, append([]string(nil), args...))
	return Result{}, nil
}

func writeExecutable(t *testing.T, contents string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), "fake-docker")
	if err := os.WriteFile(path, []byte(contents), 0o700); err != nil {
		t.Fatal(err)
	}
	return path
}