package platform

import (
	"context"
	"errors"
	"reflect"
	"testing"
)

type fakeRunner struct {
	runCalls    [][]string
	outputCalls [][]string
	outputErr   error
	output      []byte
}

func (f *fakeRunner) Run(_ context.Context, name string, args ...string) error {
	f.runCalls = append(f.runCalls, append([]string{name}, args...))
	return nil
}

func (f *fakeRunner) Output(_ context.Context, name string, args ...string) ([]byte, error) {
	f.outputCalls = append(f.outputCalls, append([]string{name}, args...))
	return f.output, f.outputErr
}

func TestPacmanInstallShellsOutCorrectly(t *testing.T) {
	r := &fakeRunner{}
	p := NewPacman(r)
	if err := p.Install(context.Background(), []string{"tio", "git"}); err != nil {
		t.Fatal(err)
	}
	if len(r.runCalls) != 1 {
		t.Fatalf("run calls = %d", len(r.runCalls))
	}
	want := []string{"sudo", "pacman", "-S", "--needed", "--noconfirm", "tio", "git"}
	if !reflect.DeepEqual(r.runCalls[0], want) {
		t.Fatalf("args = %v, want %v", r.runCalls[0], want)
	}
}

func TestPacmanInstallEmptyIsNoop(t *testing.T) {
	r := &fakeRunner{}
	p := NewPacman(r)
	if err := p.Install(context.Background(), nil); err != nil {
		t.Fatal(err)
	}
	if len(r.runCalls) != 0 {
		t.Fatalf("expected no calls, got %v", r.runCalls)
	}
}

func TestPacmanIsInstalledTrue(t *testing.T) {
	r := &fakeRunner{output: []byte("tio 3.2-1")}
	p := NewPacman(r)
	ok, err := p.IsInstalled(context.Background(), "tio")
	if err != nil {
		t.Fatal(err)
	}
	if !ok {
		t.Fatal("want installed=true")
	}
}

func TestPacmanIsInstalledFalseOnError(t *testing.T) {
	r := &fakeRunner{outputErr: errors.New("not found")}
	p := NewPacman(r)
	ok, err := p.IsInstalled(context.Background(), "ghost")
	if err != nil {
		t.Fatal(err)
	}
	if ok {
		t.Fatal("want installed=false")
	}
}

func TestPacmanUpdate(t *testing.T) {
	r := &fakeRunner{}
	p := NewPacman(r)
	if err := p.Update(context.Background()); err != nil {
		t.Fatal(err)
	}
	want := []string{"sudo", "pacman", "-Sy"}
	if !reflect.DeepEqual(r.runCalls[0], want) {
		t.Fatalf("args = %v, want %v", r.runCalls[0], want)
	}
}