package greenledsocket

import (
	"context"
	"encoding/json"
	"io"
	"net"
	"os"
	"path/filepath"
	"testing"
	"time"

	"tera-clone/services/tera-api/internal/hardware/greenled"
)

func TestServerRespondsToNewlineFramedRequestWithoutWaitingForEOF(t *testing.T) {
	serverConnection, clientConnection := net.Pipe()
	defer clientConnection.Close()
	done := make(chan struct{})
	go func() {
		(Server{}).handleConnection(serverConnection)
		close(done)
	}()
	if err := clientConnection.SetDeadline(time.Now().Add(time.Second)); err != nil {
		t.Fatal(err)
	}
	if _, err := io.WriteString(clientConnection, "{\"action\":\"unsupported\"}\n"); err != nil {
		t.Fatal(err)
	}
	var result response
	if err := json.NewDecoder(clientConnection).Decode(&result); err != nil {
		t.Fatalf("decode response before client EOF: %v", err)
	}
	if result.Code != "validation_failed" || result.Error != "hardware control action is not supported" {
		t.Fatalf("response = %#v", result)
	}
	select {
	case <-done:
	case <-time.After(time.Second):
		t.Fatal("server did not close the completed request")
	}
}

func TestClientAndServerControlOnlyMappedGPIOLEDs(t *testing.T) {
	root := t.TempDir()
	for channel := 1; channel <= greenled.ChannelCount; channel++ {
		name := "ch" + twoDigits(channel) + "-green-led-force"
		if err := os.MkdirAll(filepath.Join(root, name), 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(root, name, "brightness"), []byte("0\n"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	socketPath := filepath.Join(t.TempDir(), "green-leds.sock")
	listener, err := net.Listen("unix", socketPath)
	if err != nil {
		t.Skipf("unix sockets unavailable: %v", err)
	}
	defer listener.Close()

	server := Server{Controller: greenled.NewSysfsController(root)}
	done := make(chan error, 1)
	go func() { done <- server.Serve(listener) }()
	client := NewClient(socketPath)

	states, err := client.States(context.Background())
	if err != nil || len(states) != greenled.ChannelCount || states[8].Channel != "CH09" || states[8].I2CAddress != "0x21" || states[8].GPIOOffset != 0 {
		t.Fatalf("states = %#v, %v", states, err)
	}
	state, err := client.SetForce(context.Background(), "CH09", true)
	if err != nil || !state.Forced {
		t.Fatalf("set force = %#v, %v", state, err)
	}
	state, err = client.Pulse(context.Background(), "CH09", greenled.MinPulseDuration)
	if err != nil || state.Forced {
		t.Fatalf("pulse = %#v, %v", state, err)
	}
	if err := listener.Close(); err != nil {
		t.Fatal(err)
	}
	select {
	case err := <-done:
		if err != nil {
			t.Fatal(err)
		}
	case <-time.After(time.Second):
		t.Fatal("server did not stop")
	}
}

func twoDigits(value int) string {
	return string(rune('0'+value/10)) + string(rune('0'+value%10))
}