package operator

import (
	"bufio"
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"

	altv1 "git.toki-labs.com/toki/alt/packages/contracts/gen/go/alt/v1"
)

// TestPaperTradingFixtureIsValid guards the paper trading scenario fixture and
// its expected output: the YAML must pass dry-run validation and every expected
// JSONL line must parse and carry the paper account_id key the operator relies
// on for monitoring.
func TestPaperTradingFixtureIsValid(t *testing.T) {
	yamlPath := filepath.Join("..", "..", "testdata", "operator", "paper_trading_state.yaml")
	if _, err := LoadScenario(yamlPath); err != nil {
		t.Fatalf("paper_trading_state.yaml failed validation: %v", err)
	}

	expectedPath := filepath.Join("..", "..", "testdata", "operator", "expected", "paper_trading_state.jsonl")
	f, err := os.Open(expectedPath)
	if err != nil {
		t.Fatalf("open expected fixture: %v", err)
	}
	defer f.Close()

	scanner := bufio.NewScanner(f)
	sawAccount := false
	sawSummary := false
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" {
			continue
		}
		var rec map[string]any
		if err := json.Unmarshal([]byte(line), &rec); err != nil {
			t.Fatalf("expected fixture line not valid JSON: %v", err)
		}
		if rec["scenario"] != "paper_trading_state" {
			t.Errorf("line scenario = %v, want paper_trading_state", rec["scenario"])
		}
		if rec["account_id"] == "paper-1" {
			sawAccount = true
		}
		if rec["type"] == "summary" {
			sawSummary = true
		}
	}
	if err := scanner.Err(); err != nil {
		t.Fatalf("scan expected fixture: %v", err)
	}
	if !sawAccount {
		t.Error("expected fixture missing an account_id=paper-1 line")
	}
	if !sawSummary {
		t.Error("expected fixture missing a summary line")
	}
}

func paperState(accountID string) *altv1.PaperTradingState {
	return &altv1.PaperTradingState{
		AccountId: accountID,
		Run: &altv1.BacktestRun{
			Id:     "paper-run-1",
			Status: altv1.BacktestRunStatus_BACKTEST_RUN_STATUS_SUCCEEDED,
		},
		Cash: &altv1.Price{Currency: altv1.Currency_CURRENCY_KRW, Amount: &altv1.Decimal{Value: "9998950"}},
		Positions: []*altv1.BacktestPosition{
			{InstrumentId: "KRX:005930", Quantity: &altv1.Quantity{Amount: &altv1.Decimal{Value: "1"}}, LastPrice: &altv1.Price{Amount: &altv1.Decimal{Value: "1150"}}},
		},
		Fills: []*altv1.BacktestTrade{
			{InstrumentId: "KRX:005930", Side: "buy", Price: &altv1.Price{Amount: &altv1.Decimal{Value: "1050"}}},
		},
	}
}

func TestRunStartPaperTradingOutputsAccountState(t *testing.T) {
	api := &fakeAPI{startPaperResp: &altv1.StartPaperTradingResponse{State: paperState("paper-1")}}
	url := startFakeAPIServer(t, api)
	sc := &Scenario{
		Name: "paper_trading_state",
		Steps: []Step{
			{
				ID:     "start",
				Action: ActionStartPaperTrading,
				Request: Request{
					AccountID:    "paper-1",
					StrategyID:   "strategy-v1",
					Market:       "kr",
					Timeframe:    "daily",
					FromUnixMs:   1746057600000,
					ToUnixMs:     1747267200000,
					StartingCash: "10000000",
				},
				Expect: Expect{Status: "ok", RunStatus: "succeeded"},
			},
		},
	}

	out, code := runScenario(t, sc, url)
	if code != codeOK {
		t.Fatalf("exit code = %d, want 0 (out=%q)", code, out)
	}
	for _, want := range []string{
		"account_id=paper-1",
		"run.status=succeeded",
		"cash=9998950",
		"position_count=1",
		"fill_count=1",
	} {
		if !strings.Contains(out, want) {
			t.Errorf("output %q missing %q", out, want)
		}
	}

	got := api.lastStartPaperReq()
	if got == nil {
		t.Fatal("server did not receive a start paper trading request")
	}
	if got.GetAccountId() != "paper-1" {
		t.Errorf("server received account_id = %q, want paper-1", got.GetAccountId())
	}
	if got.GetStartingCash().GetCurrency() != altv1.Currency_CURRENCY_KRW {
		t.Errorf("server received currency = %v, want KRW (derived from kr market)", got.GetStartingCash().GetCurrency())
	}
	if got.GetStartingCash().GetAmount().GetValue() != "10000000" {
		t.Errorf("server received starting cash = %q, want 10000000", got.GetStartingCash().GetAmount().GetValue())
	}
}

func TestRunGetPaperTradingStateOutputsFields(t *testing.T) {
	api := &fakeAPI{getPaperStateResp: &altv1.GetPaperTradingStateResponse{State: paperState("paper-1")}}
	url := startFakeAPIServer(t, api)
	sc := &Scenario{
		Name: "paper_trading_state",
		Steps: []Step{
			{
				ID:      "state",
				Action:  ActionGetPaperTradingState,
				Request: Request{AccountID: "paper-1"},
				Expect:  Expect{Status: "ok"},
			},
		},
	}

	out, code := runScenario(t, sc, url)
	if code != codeOK {
		t.Fatalf("exit code = %d, want 0 (out=%q)", code, out)
	}
	if !strings.Contains(out, "account_id=paper-1") || !strings.Contains(out, "position_count=1") {
		t.Errorf("output %q missing paper state fields", out)
	}

	got := api.lastGetPaperStateReq()
	if got == nil {
		t.Fatal("server did not receive a get paper state request")
	}
	if got.GetAccountId() != "paper-1" {
		t.Errorf("server received account_id = %q, want paper-1", got.GetAccountId())
	}
}

func TestRunGetPaperTradingStateNotFoundTypedError(t *testing.T) {
	api := &fakeAPI{getPaperStateResp: &altv1.GetPaperTradingStateResponse{
		Error: &altv1.ErrorInfo{Code: "not_found", Message: "paper trading account not found"},
	}}
	url := startFakeAPIServer(t, api)
	sc := &Scenario{
		Name: "paper_trading_state",
		Steps: []Step{
			{
				ID:      "state",
				Action:  ActionGetPaperTradingState,
				Request: Request{AccountID: "missing"},
				Expect:  Expect{Status: "error", ErrorCode: "not_found"},
			},
		},
	}

	out, code := runScenario(t, sc, url)
	if code != codeOK {
		t.Fatalf("exit code = %d, want 0 (out=%q)", code, out)
	}
	if !strings.Contains(out, "error.code=not_found") {
		t.Errorf("output %q missing error.code=not_found", out)
	}
}