package gittools

import (
	"context"
	"strings"
	"testing"

	"gitlab.hive-brain.de/MDietermann/Archduino/internal/module"
	"gitlab.hive-brain.de/MDietermann/Archduino/internal/platform"
)

type fakeRunner struct {
	runCalls  [][]string
	outCalls  [][]string
	installed map[string]bool // key: pkg name
}

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.outCalls = append(f.outCalls, append([]string{name}, args...))
	if name == "pacman" && len(args) == 2 && args[0] == "-Q" {
		if f.installed[args[1]] {
			return []byte(args[1] + " 1.0-1\n"), nil
		}
		return nil, errExitOne
	}
	return nil, nil
}

type exitOneErr struct{}

func (exitOneErr) Error() string { return "exit status 1" }

var errExitOne = exitOneErr{}

type nopReporter struct{}

func (nopReporter) Progress(string, int, int, string) {}
func (nopReporter) Log(string, string)                {}

func TestDetectAbsent(t *testing.T) {
	r := &fakeRunner{installed: map[string]bool{}}
	m := New([]string{"lazygit"}, platform.NewPacman(r))
	st, err := m.Detect(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	s := st.(state)
	if len(s.Missing) != 1 {
		t.Fatalf("want 1 missing, got %v", s.Missing)
	}
}

func TestDetectPresent(t *testing.T) {
	r := &fakeRunner{installed: map[string]bool{"lazygit": true}}
	m := New([]string{"lazygit"}, platform.NewPacman(r))
	st, _ := m.Detect(context.Background())
	if len(st.(state).Missing) != 0 {
		t.Fatalf("want 0 missing, got %v", st.(state).Missing)
	}
}

func TestPlanAbsentEmitsInstallAction(t *testing.T) {
	m := New([]string{"lazygit"}, nil)
	p, _ := m.Plan(context.Background(), state{Missing: []string{"lazygit"}})
	if len(p.Actions) != 1 {
		t.Fatalf("want 1 action, got %d", len(p.Actions))
	}
	if !strings.Contains(p.Actions[0].Description, "lazygit") {
		t.Fatalf("desc: %s", p.Actions[0].Description)
	}
}

func TestPlanPresentEmpty(t *testing.T) {
	m := New([]string{"lazygit"}, nil)
	p, _ := m.Plan(context.Background(), state{Missing: nil})
	if !p.IsEmpty() {
		t.Fatal("want empty plan")
	}
}

func TestApplyShellsOut(t *testing.T) {
	r := &fakeRunner{installed: map[string]bool{}}
	m := New([]string{"lazygit"}, platform.NewPacman(r))
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if err := m.Apply(context.Background(), p, nopReporter{}); err != nil {
		t.Fatal(err)
	}
	sawInstall := false
	for _, c := range r.runCalls {
		if len(c) >= 4 && c[0] == "sudo" && c[1] == "pacman" && c[2] == "-S" {
			sawInstall = true
		}
	}
	if !sawInstall {
		t.Fatalf("no pacman install call; calls=%v", r.runCalls)
	}
}

func TestVerifyAfterApply(t *testing.T) {
	r := &fakeRunner{installed: map[string]bool{"lazygit": true}}
	m := New([]string{"lazygit"}, platform.NewPacman(r))
	if err := m.Verify(context.Background()); err != nil {
		t.Fatal(err)
	}
}

func TestPlanForceReinstallsAllPackages(t *testing.T) {
	r := &fakeRunner{installed: map[string]bool{"lazygit": true}}
	m := New([]string{"lazygit"}, platform.NewPacman(r))
	plan, err := m.PlanForce(context.Background())
	if err != nil {
		t.Fatalf("PlanForce: %v", err)
	}
	if plan.IsEmpty() {
		t.Fatal("force plan must not be empty even when packages are installed")
	}
	for _, a := range plan.Actions {
		if err := a.Exec(context.Background()); err != nil {
			t.Fatalf("Exec: %v", err)
		}
	}
	sawReinstall := false
	for _, c := range r.runCalls {
		if len(c) >= 4 && c[0] == "sudo" && c[1] == "pacman" && c[2] == "-S" && c[3] == "--noconfirm" {
			sawReinstall = true
		}
	}
	if !sawReinstall {
		t.Fatalf("no pacman reinstall (-S --noconfirm, no --needed) call; calls=%v", r.runCalls)
	}
}

var _ module.Module = Module{}