package trading212

import (
	"bytes"
	"io"
	"net/http"
	"testing"
	"time"

	"github.com/nmoniz/any2anexoj/internal"
	"github.com/nmoniz/any2anexoj/internal/ofigi"
	"github.com/shopspring/decimal"
)

func TestRecordSerializer_RoundTrip(t *testing.T) {
	want := Record{
		symbol:       "XX1234567890",
		timestamp:    time.Date(2025, 7, 3, 10, 44, 29, 0, time.UTC),
		kind:         internal.KindBuy,
		quantity:     ShouldParseDecimal(t, "2.4387014200"),
		price:        ShouldParseDecimal(t, "7.3690000000"),
		fees:         ShouldParseDecimal(t, "0.02"),
		taxes:        ShouldParseDecimal(t, "0.25"),
		natureGetter: func() internal.Nature { return internal.NatureG01 },
	}

	s := NewRecordSerializer(NewFigiClientSecurityTypeStub(t, "Common Stock"))

	data, err := s.MarshalRecord(t.Context(), want)
	if err != nil {
		t.Fatalf("MarshalRecord: %v", err)
	}

	got, err := s.UnmarshalRecord(t.Context(), data)
	if err != nil {
		t.Fatalf("UnmarshalRecord: %v", err)
	}

	if got.Symbol() != want.Symbol() {
		t.Errorf("Symbol: want %q but got %q", want.Symbol(), got.Symbol())
	}
	if got.Kind() != want.Kind() {
		t.Errorf("Kind: want %v but got %v", want.Kind(), got.Kind())
	}
	if !got.Price().Equal(want.Price()) {
		t.Errorf("Price: want %v but got %v", want.Price(), got.Price())
	}
	if !got.Quantity().Equal(want.Quantity()) {
		t.Errorf("Quantity: want %v but got %v", want.Quantity(), got.Quantity())
	}
	if !got.Fees().Equal(want.Fees()) {
		t.Errorf("Fees: want %v but got %v", want.Fees(), got.Fees())
	}
	if !got.Taxes().Equal(want.Taxes()) {
		t.Errorf("Taxes: want %v but got %v", want.Taxes(), got.Taxes())
	}
	if !got.Timestamp().Equal(want.Timestamp()) {
		t.Errorf("Timestamp: want %v but got %v", want.Timestamp(), got.Timestamp())
	}
}

func TestRecordSerializer_UnmarshalRecord_NatureTriggersOpenFIGI(t *testing.T) {
	var calls int
	client := &http.Client{
		Timeout: time.Second,
		Transport: RoundTripFunc(func(req *http.Request) (*http.Response, error) {
			calls++
			return &http.Response{
				Status:     http.StatusText(http.StatusOK),
				StatusCode: http.StatusOK,
				Body:       io.NopCloser(bytes.NewBufferString(`[{"data":[{"securityType":"Common Stock"}]}]`)),
				Request:    req,
			}, nil
		}),
	}

	s := NewRecordSerializer(ofigi.NewOpenFIGI(client, ""))

	original := Record{
		symbol:    "XX1234567890",
		timestamp: time.Date(2025, 7, 3, 10, 44, 29, 0, time.UTC),
		kind:      internal.KindBuy,
		quantity:  ShouldParseDecimal(t, "2.4387014200"),
		price:     ShouldParseDecimal(t, "7.3690000000"),
		fees:      ShouldParseDecimal(t, "0.02"),
		taxes:     ShouldParseDecimal(t, "0.25"),
		// Pre-populated so MarshalRecord doesn't accidentally trigger an
		// OpenFIGI call when encoding the original record.
		natureGetter: func() internal.Nature { return internal.NatureG01 },
	}

	data, err := s.MarshalRecord(t.Context(), original)
	if err != nil {
		t.Fatalf("MarshalRecord: %v", err)
	}

	if calls != 0 {
		t.Fatalf("OpenFIGI called during MarshalRecord: %d", calls)
	}

	got, err := s.UnmarshalRecord(t.Context(), data)
	if err != nil {
		t.Fatalf("UnmarshalRecord: %v", err)
	}

	// Nature must not have been resolved yet — natureGetter is lazy.
	if calls != 0 {
		t.Fatalf("OpenFIGI called before Nature(): %d", calls)
	}

	if nature := got.Nature(); nature != internal.NatureG01 {
		t.Errorf("Nature: want %v but got %v", internal.NatureG01, nature)
	}

	if calls != 1 {
		t.Errorf("OpenFIGI request count: want 1 but got %d", calls)
	}

	// Subsequent Nature() calls should not re-trigger the request (the
	// underlying sync.OnceValue caches the result on the client too).
	if nature := got.Nature(); nature != internal.NatureG01 {
		t.Errorf("Nature (cached): want %v but got %v", internal.NatureG01, nature)
	}
	if calls != 1 {
		t.Errorf("OpenFIGI request count after re-read: want 1 but got %d", calls)
	}
}

func TestRecordSerializer_MarshalRecord_WrongType(t *testing.T) {
	s := NewRecordSerializer(NewFigiClientSecurityTypeStub(t, "Common Stock"))

	_, err := s.MarshalRecord(t.Context(), stubRecord{})
	if err == nil {
		t.Fatal("want error but got nil")
	}
}

// stubRecord is a non-trading212 implementation of internal.Record used to
// verify that MarshalRecord rejects unrelated record types.
type stubRecord struct{}

func (stubRecord) Symbol() string            { return "STUB" }
func (stubRecord) Nature() internal.Nature   { return internal.NatureUnknown }
func (stubRecord) BrokerCountry() int64      { return 0 }
func (stubRecord) AssetCountry() int64       { return 0 }
func (stubRecord) Kind() internal.Kind       { return internal.KindUnknown }
func (stubRecord) Price() decimal.Decimal    { return decimal.Zero }
func (stubRecord) Quantity() decimal.Decimal { return decimal.Zero }
func (stubRecord) Timestamp() time.Time      { return time.Time{} }
func (stubRecord) Fees() decimal.Decimal     { return decimal.Zero }
func (stubRecord) Taxes() decimal.Decimal    { return decimal.Zero }