package tester_test

import (
	"testing"
	"time"

	"git.georgsen.dk/hwlab/internal/tester"
)

// Compile-time interface assertions
var (
	_ tester.TesterDriver          = (*tester.MockUSBDriver)(nil)
	_ tester.TesterDriver          = (*tester.MockDPDriver)(nil)
	_ tester.TesterDriver          = (*tester.MockHDMIDriver)(nil)
	_ tester.StreamingTesterDriver = (*tester.MockFNB58Driver)(nil)
)

// ---- MockUSBDriver tests ----

func TestMockUSBDriver_Connect_Read_Disconnect(t *testing.T) {
	d := &tester.MockUSBDriver{}

	if err := d.Connect(); err != nil {
		t.Fatalf("Connect() unexpected error: %v", err)
	}

	result, err := d.Read()
	if err != nil {
		t.Fatalf("Read() unexpected error: %v", err)
	}
	if result.CableType != tester.CableTypeUSB {
		t.Errorf("CableType = %v, want CableTypeUSB", result.CableType)
	}
	if result.USBVersion != "USB 3.2 Gen 2" {
		t.Errorf("USBVersion = %q, want %q", result.USBVersion, "USB 3.2 Gen 2")
	}
	if result.SpeedGbps != 10.0 {
		t.Errorf("SpeedGbps = %v, want 10.0", result.SpeedGbps)
	}
	if result.MaxWatts != 100 {
		t.Errorf("MaxWatts = %v, want 100", result.MaxWatts)
	}
	if !result.PinContinuity {
		t.Error("PinContinuity = false, want true")
	}
	if !result.HasEMarker {
		t.Error("HasEMarker = false, want true")
	}
	if result.ResistanceOhm != 0.12 {
		t.Errorf("ResistanceOhm = %v, want 0.12", result.ResistanceOhm)
	}

	if err := d.Disconnect(); err != nil {
		t.Fatalf("Disconnect() unexpected error: %v", err)
	}
	// Idempotent second disconnect
	if err := d.Disconnect(); err != nil {
		t.Fatalf("second Disconnect() unexpected error: %v", err)
	}
}

func TestMockUSBDriver_ReadBeforeConnect(t *testing.T) {
	d := &tester.MockUSBDriver{}
	_, err := d.Read()
	if err != tester.ErrNotConnected {
		t.Errorf("Read() before Connect() = %v, want ErrNotConnected", err)
	}
}

// ---- MockDPDriver tests ----

func TestMockDPDriver_Connect_Read_Disconnect(t *testing.T) {
	d := &tester.MockDPDriver{}

	if err := d.Connect(); err != nil {
		t.Fatalf("Connect() unexpected error: %v", err)
	}

	result, err := d.Read()
	if err != nil {
		t.Fatalf("Read() unexpected error: %v", err)
	}
	if result.CableType != tester.CableTypeDP {
		t.Errorf("CableType = %v, want CableTypeDP", result.CableType)
	}
	if result.DPVersion != "1.4" {
		t.Errorf("DPVersion = %q, want %q", result.DPVersion, "1.4")
	}
	if !result.PinContinuity {
		t.Error("PinContinuity = false, want true")
	}

	if err := d.Disconnect(); err != nil {
		t.Fatalf("Disconnect() unexpected error: %v", err)
	}
	if err := d.Disconnect(); err != nil {
		t.Fatalf("second Disconnect() unexpected error: %v", err)
	}
}

func TestMockDPDriver_ReadBeforeConnect(t *testing.T) {
	d := &tester.MockDPDriver{}
	_, err := d.Read()
	if err != tester.ErrNotConnected {
		t.Errorf("Read() before Connect() = %v, want ErrNotConnected", err)
	}
}

// ---- MockHDMIDriver tests ----

func TestMockHDMIDriver_Connect_Read_Disconnect(t *testing.T) {
	d := &tester.MockHDMIDriver{}

	if err := d.Connect(); err != nil {
		t.Fatalf("Connect() unexpected error: %v", err)
	}

	result, err := d.Read()
	if err != nil {
		t.Fatalf("Read() unexpected error: %v", err)
	}
	if result.CableType != tester.CableTypeHDMI {
		t.Errorf("CableType = %v, want CableTypeHDMI", result.CableType)
	}
	if result.HDMIVersion != "2.1" {
		t.Errorf("HDMIVersion = %q, want %q", result.HDMIVersion, "2.1")
	}
	if !result.PinContinuity {
		t.Error("PinContinuity = false, want true")
	}

	if err := d.Disconnect(); err != nil {
		t.Fatalf("Disconnect() unexpected error: %v", err)
	}
	if err := d.Disconnect(); err != nil {
		t.Fatalf("second Disconnect() unexpected error: %v", err)
	}
}

func TestMockHDMIDriver_ReadBeforeConnect(t *testing.T) {
	d := &tester.MockHDMIDriver{}
	_, err := d.Read()
	if err != tester.ErrNotConnected {
		t.Errorf("Read() before Connect() = %v, want ErrNotConnected", err)
	}
}

// ---- KnownDevices tests ----

func TestKnownDevices_HasTesterEntries(t *testing.T) {
	// This test is in usb package — placeholder to ensure cross-package compile succeeds.
	// Actual KnownDevices assertions are in internal/usb/device_test.go
}

// ---- MockFNB58Driver tests ----

func TestFNB58Driver_Connect_Stream_Readings(t *testing.T) {
	d := &tester.MockFNB58Driver{}

	if err := d.Connect(); err != nil {
		t.Fatalf("Connect() unexpected error: %v", err)
	}

	ch := d.Stream()
	if ch == nil {
		t.Fatal("Stream() returned nil channel")
	}

	var readings []tester.LiveReading
	timeout := time.After(5 * time.Second)
	for {
		select {
		case r, ok := <-ch:
			if !ok {
				goto done
			}
			readings = append(readings, r)
		case <-timeout:
			t.Fatal("timed out waiting for stream to close")
		}
	}
done:
	if len(readings) != 3 {
		t.Errorf("got %d readings, want 3", len(readings))
	}
	for i, r := range readings {
		if r.Voltage != 5.1 {
			t.Errorf("reading[%d].Voltage = %v, want 5.1", i, r.Voltage)
		}
		if r.CurrentAmps != 3.0 {
			t.Errorf("reading[%d].CurrentAmps = %v, want 3.0", i, r.CurrentAmps)
		}
		if r.PowerWatts != 15.3 {
			t.Errorf("reading[%d].PowerWatts = %v, want 15.3", i, r.PowerWatts)
		}
		if r.PDProtocol != "PD3.0" {
			t.Errorf("reading[%d].PDProtocol = %q, want %q", i, r.PDProtocol, "PD3.0")
		}
		if r.Timestamp.IsZero() {
			t.Errorf("reading[%d].Timestamp is zero", i)
		}
	}

	if err := d.Disconnect(); err != nil {
		t.Fatalf("Disconnect() unexpected error: %v", err)
	}
}

func TestStreamBeforeConnect_ReturnsClosed(t *testing.T) {
	d := &tester.MockFNB58Driver{}
	ch := d.Stream()
	if ch == nil {
		t.Fatal("Stream() returned nil, want closed channel")
	}
	select {
	case _, ok := <-ch:
		if ok {
			t.Error("Stream() before Connect() should return a closed channel, got open")
		}
	default:
		t.Error("Stream() before Connect() should return a closed (readable) channel, not blocked")
	}
}

func TestFNB58Driver_DisconnectStopsStream(t *testing.T) {
	d := &tester.MockFNB58Driver{}
	if err := d.Connect(); err != nil {
		t.Fatalf("Connect() unexpected error: %v", err)
	}

	ch := d.Stream()

	// Disconnect early — may receive 0..3 readings, then channel closes
	if err := d.Disconnect(); err != nil {
		t.Fatalf("Disconnect() unexpected error: %v", err)
	}

	timeout := time.After(2 * time.Second)
	for {
		select {
		case _, ok := <-ch:
			if !ok {
				return // channel closed — success
			}
		case <-timeout:
			t.Fatal("channel not closed after Disconnect()")
		}
	}
}