package service

import (
	"context"
	"errors"
	"testing"
	"time"

	appconfig "github.com/D36u99er/bc-netts-energy/internal/config"
	"github.com/D36u99er/bc-netts-energy/internal/netts"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"log/slog"
)

func TestEnsureEnergyAddsAddressAndOrdersCycles(t *testing.T) {
	mock := &mockNettsClient{
		analyzeData: &netts.AnalyzeUSDTData{
			TransferDetails: netts.TransferDetails{
				RecommendedEnergy: 131000,
				EnergyNeeded:      131000,
			},
		},
		statusResponses: []statusResponse{
			{err: netts.ErrAddressNotFound},
			{status: &netts.AddressStatus{CyclesRemaining: 2}},
			{status: &netts.AddressStatus{CyclesRemaining: 5}},
		},
		orderResult: &netts.OrderResult{
			CyclesPurchased: 3,
			TotalCycles:     5,
			OrderID:         "ORD-123",
			Status:          "confirmed",
			TotalCost:       7.5,
		},
	}

	cfg := appconfig.EnergyConfig{
		AutoAddHost:         true,
		MinCycles:           3,
		TargetCycles:        5,
		PostOrderWait:       appconfig.Duration(0),
		DefaultAnalyzeValue: "100.00",
	}

	logger := slog.New(slog.NewTextHandler(ioDiscard{}, &slog.HandlerOptions{Level: slog.LevelDebug}))
	svc := NewEnergyService(cfg, mock, logger)

	resp, err := svc.EnsureEnergy(context.Background(), EnsureEnergyRequest{
		FromAddress: "TQn9Y2khEsLJW1ChVWFMSMeRDow5KcbLSE",
		ToAddress:   "TUmyHQNzAkT6SrwThVvay7G4yfGZAyWhmy",
		Amount:      "50.0",
	})
	require.NoError(t, err)

	assert.True(t, resp.AddressAdded)
	assert.Equal(t, 3, resp.CyclesPurchased)
	assert.Equal(t, 5, resp.CyclesAfter)
	assert.Equal(t, "ORD-123", resp.OrderID)
	assert.Equal(t, 131000, resp.RecommendedEnergy)
	assert.Equal(t, 131000, resp.EnergyNeeded)

	assert.Equal(t, 1, mock.addCalls)
	assert.Equal(t, []int{3}, mock.orderCalls)
	assert.Equal(t, 0, len(mock.statusResponses))
}

func TestEnsureEnergyFailsWhenAutoAddDisabled(t *testing.T) {
	mock := &mockNettsClient{
		analyzeData: &netts.AnalyzeUSDTData{TransferDetails: netts.TransferDetails{RecommendedEnergy: 1000}},
		statusResponses: []statusResponse{
			{err: netts.ErrAddressNotFound},
		},
	}

	cfg := appconfig.EnergyConfig{
		AutoAddHost:  false,
		MinCycles:    2,
		TargetCycles: 4,
	}

	logger := slog.New(slog.NewTextHandler(ioDiscard{}, nil))
	svc := NewEnergyService(cfg, mock, logger)

	_, err := svc.EnsureEnergy(context.Background(), EnsureEnergyRequest{
		FromAddress: "TQn9Y2khEsLJW1ChVWFMSMeRDow5KcbLSE",
		ToAddress:   "TUmyHQNzAkT6SrwThVvay7G4yfGZAyWhmy",
	})
	require.Error(t, err)
	assert.Equal(t, 0, mock.addCalls)
}

func TestEnsureEnergySkipsOrderWhenSufficientCycles(t *testing.T) {
	mock := &mockNettsClient{
		analyzeData: &netts.AnalyzeUSDTData{
			TransferDetails: netts.TransferDetails{
				RecommendedEnergy: 90000,
				EnergyNeeded:      80000,
			},
		},
		statusResponses: []statusResponse{
			{status: &netts.AddressStatus{CyclesRemaining: 5}},
		},
	}

	cfg := appconfig.EnergyConfig{
		AutoAddHost:  true,
		MinCycles:    3,
		TargetCycles: 6,
	}

	logger := slog.New(slog.NewTextHandler(ioDiscard{}, nil))
	svc := NewEnergyService(cfg, mock, logger)

	resp, err := svc.EnsureEnergy(context.Background(), EnsureEnergyRequest{
		FromAddress: "TQn9Y2khEsLJW1ChVWFMSMeRDow5KcbLSE",
		ToAddress:   "TUmyHQNzAkT6SrwThVvay7G4yfGZAyWhmy",
	})
	require.NoError(t, err)

	assert.False(t, resp.AddressAdded)
	assert.Equal(t, 0, resp.CyclesPurchased)
	assert.Equal(t, 5, resp.CyclesAfter)
	assert.Empty(t, mock.orderCalls)
}

type statusResponse struct {
	status *netts.AddressStatus
	err    error
}

type mockNettsClient struct {
	analyzeData     *netts.AnalyzeUSDTData
	statusResponses []statusResponse
	orderResult     *netts.OrderResult

	addCalls   int
	orderCalls []int
}

func (m *mockNettsClient) AnalyzeUSDT(ctx context.Context, req netts.AnalyzeUSDTRequest) (*netts.AnalyzeUSDTData, error) {
	if m.analyzeData == nil {
		return nil, errors.New("no analysis data")
	}
	return m.analyzeData, nil
}

func (m *mockNettsClient) GetAddressStatus(ctx context.Context, address string) (*netts.AddressStatus, error) {
	if len(m.statusResponses) == 0 {
		return nil, errors.New("no status response")
	}
	resp := m.statusResponses[0]
	m.statusResponses = m.statusResponses[1:]
	return resp.status, resp.err
}

func (m *mockNettsClient) AddHostAddress(ctx context.Context, address, callback string) (*netts.AddAddressResult, error) {
	m.addCalls++
	return &netts.AddAddressResult{
		Address:     address,
		CallbackURL: callback,
		Timestamp:   time.Now().UTC().Format(time.RFC3339),
	}, nil
}

func (m *mockNettsClient) OrderCycles(ctx context.Context, address string, cycles int) (*netts.OrderResult, error) {
	m.orderCalls = append(m.orderCalls, cycles)
	if m.orderResult != nil {
		return m.orderResult, nil
	}
	return &netts.OrderResult{
		CyclesPurchased: cycles,
		TotalCycles:     cycles,
		OrderID:         "ORD",
		Status:          "confirmed",
	}, nil
}

type ioDiscard struct{}

func (ioDiscard) Write(p []byte) (int, error) { return len(p), nil }