package zellij

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"gitlab.hive-brain.de/MDietermann/Archduino/internal/config"
	"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
}

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("ok"), nil
		}
		return nil, errOne
	}
	return nil, nil
}

type eo struct{}

func (eo) Error() string { return "exit 1" }

var errOne = eo{}

type nop struct{}

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

func TestZellijPlanAppliesInstallAndConfig(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Write([]byte("keybinds {}\n"))
	}))
	defer srv.Close()
	r := &fakeRunner{installed: map[string]bool{}}
	m := New(config.ZellijConfig{ConfigURL: srv.URL}, platform.NewPacman(r))
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if err := m.Apply(context.Background(), p, nop{}); err != nil {
		t.Fatal(err)
	}
	got, err := os.ReadFile(filepath.Join(home, ".config", "zellij", "config.kdl"))
	if err != nil {
		t.Fatalf("config not written: %v", err)
	}
	if string(got) != "keybinds {}\n" {
		t.Fatalf("unexpected content %q", got)
	}
}

func TestZellijInstalledPresentEmptyPlan(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	r := &fakeRunner{installed: map[string]bool{"zellij": true}}
	m := New(config.ZellijConfig{ConfigURL: ""}, platform.NewPacman(r))
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if !p.IsEmpty() {
		t.Fatalf("want empty plan, got %+v", p)
	}
}

func TestPlanForceReinstallsAndRewritesConfig(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	os.MkdirAll(filepath.Join(home, ".config", "zellij"), 0o755)
	os.WriteFile(filepath.Join(home, ".config", "zellij", "config.kdl"), []byte("old\n"), 0o644)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Write([]byte("fresh {}\n"))
	}))
	defer srv.Close()
	r := &fakeRunner{installed: map[string]bool{"zellij": true}}
	m := New(config.ZellijConfig{ConfigURL: srv.URL}, 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")
	}
	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 call; calls=%v", r.runCalls)
	}
	got, err := os.ReadFile(filepath.Join(home, ".config", "zellij", "config.kdl"))
	if err != nil {
		t.Fatalf("config not written: %v", err)
	}
	if string(got) != "fresh {}\n" {
		t.Fatalf("config not overwritten: %q", got)
	}
}

var _ module.Module = Module{}