package renode

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"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, 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, errExit1
	}
	return nil, nil
}

type exitOne struct{}

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

var errExit1 = exitOne{}

type nopReporter struct{}

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

func sampleCfg(url string) config.RenodeConfig {
	return config.RenodeConfig{
		WokwiVersion: "0.28.1",
		WokwiURL:     url,
		Platforms: []config.RenodePlatform{
			{Name: "stm32f4", ReplPath: "platforms/boards/stm32f4_discovery.repl", Machine: "STM32F4_Discovery"},
			{Name: "rp2040", ReplPath: "platforms/cpus/rp2040.repl", Machine: "RP2040"},
		},
	}
}

func TestDetectNothingInstalled(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	r := &fakeRunner{installed: map[string]bool{}}
	m := New(sampleCfg("http://x/wokwi"), platform.NewPacman(r), platform.NewYay(r))
	st, err := m.Detect(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	s := st.(state)
	if s.RenodeInstalled || s.GdbInstalled || s.SimScriptCurrent || s.WokwiInstalled {
		t.Fatalf("want all absent, got %+v", s)
	}
}

func TestDetectAllInstalled(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	os.MkdirAll(filepath.Join(home, ".local", "bin"), 0o755)
	os.WriteFile(filepath.Join(home, ".local", "bin", "wokwi-cli"), []byte("x"), 0o755)
	r := &fakeRunner{installed: map[string]bool{"renode-bin": true, "arm-none-eabi-gdb": true}}
	m := New(sampleCfg("http://x/wokwi"), platform.NewPacman(r), platform.NewYay(r))
	// Apply once to seed the sim script, then re-detect.
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	_ = m.Apply(context.Background(), p, nopReporter{})
	st2, _ := m.Detect(context.Background())
	p2, _ := m.Plan(context.Background(), st2)
	if !p2.IsEmpty() {
		t.Fatalf("second plan not empty: %+v", p2.Actions)
	}
}

func TestApplyRendersSimScriptAndDownloadsWokwi(t *testing.T) {
	home := t.TempDir()
	t.Setenv("HOME", home)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Write([]byte("wokwi-binary"))
	}))
	defer srv.Close()

	r := &fakeRunner{installed: map[string]bool{"yay": true}}
	m := New(sampleCfg(srv.URL), platform.NewPacman(r), platform.NewYay(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)
	}

	// arduino-sim rendered with both platforms
	sim, err := os.ReadFile(filepath.Join(home, ".local", "bin", "arduino-sim"))
	if err != nil {
		t.Fatalf("arduino-sim not written: %v", err)
	}
	if !strings.Contains(string(sim), "stm32f4)") {
		t.Errorf("stm32f4 branch missing: %s", sim)
	}
	if !strings.Contains(string(sim), "rp2040)") {
		t.Errorf("rp2040 branch missing: %s", sim)
	}
	info, _ := os.Stat(filepath.Join(home, ".local", "bin", "arduino-sim"))
	if info.Mode().Perm() != 0o755 {
		t.Errorf("arduino-sim mode %v", info.Mode().Perm())
	}

	// wokwi-cli downloaded
	wokwi, err := os.ReadFile(filepath.Join(home, ".local", "bin", "wokwi-cli"))
	if err != nil {
		t.Fatalf("wokwi-cli missing: %v", err)
	}
	if string(wokwi) != "wokwi-binary" {
		t.Errorf("wokwi-cli content %q", wokwi)
	}

	// yay install renode-bin called
	sawYay := false
	for _, c := range r.runCalls {
		if c[0] == "yay" && len(c) >= 2 && c[1] == "-S" {
			sawYay = true
		}
	}
	if !sawYay {
		t.Fatalf("yay install missing; calls=%v", r.runCalls)
	}
}

var _ module.Module = Module{}