package membership

// Golden strings verified against scripts/match_payments.py print_report() on 2026-05-06:
//
//	PYTHONPATH=scripts:. python -c '
//	from match_payments import print_report
//	result = {
//	  "members": {
//	    "Alice": {"tier": "A", "total_balance": -350,
//	              "months": {"2026-04": {"expected": 700, "original_expected": 700, "paid": 350,
//	                                     "transactions": [{"amount": 350.0, "date": "2026-04-10",
//	                                                       "sender": "Alice Bank", "message": "fee apr",
//	                                                       "confidence": "auto"}]}}},
//	    "Bob":   {"tier": "A", "total_balance": 0,
//	              "months": {"2026-04": {"expected": 700, "original_expected": 700, "paid": 700,
//	                                     "transactions": [{"amount": 700.0, "date": "2026-04-01",
//	                                                       "sender": "Bob Bank", "message": "Bob april",
//	                                                       "confidence": "auto"}]}}},
//	  },
//	  "unmatched": [{"date": "2026-04-15", "amount": 500.0, "sender": "Unknown", "message": "?"}],
//	}
//	print_report(result, ["2026-04"])
//	'

import (
	"bytes"
	"fuj-management/go/internal/domain/reconcile"
	"strings"
	"testing"
)

func makeTestResult() (reconcile.Result, []string) {
	sortedMonths := []string{"2026-04"}

	aliceApr := reconcile.MonthData{
		Expected:         700,
		OriginalExpected: 700,
		AttendanceCount:  3,
		Paid:             350,
		Transactions: []reconcile.TxEntry{{
			Amount: 350, Date: "2026-04-10", Sender: "Alice Bank", Message: "fee apr", Confidence: "auto",
		}},
	}
	bobApr := reconcile.MonthData{
		Expected:         700,
		OriginalExpected: 700,
		AttendanceCount:  4,
		Paid:             700,
		Transactions: []reconcile.TxEntry{{
			Amount: 700, Date: "2026-04-01", Sender: "Bob Bank", Message: "Bob april", Confidence: "auto",
		}},
	}

	result := reconcile.Result{
		Members: map[string]reconcile.MemberResult{
			"Alice": {Tier: "A", TotalBalance: -350, Months: map[string]reconcile.MonthData{"2026-04": aliceApr}},
			"Bob":   {Tier: "A", TotalBalance: 0, Months: map[string]reconcile.MonthData{"2026-04": bobApr}},
		},
		Unmatched: []reconcile.Transaction{{
			Date: "2026-04-15", Amount: 500, Sender: "Unknown", Message: "?",
		}},
	}
	return result, sortedMonths
}

func TestPrintReconcileReportStructure(t *testing.T) {
	t.Parallel()
	result, sortedMonths := makeTestResult()

	var buf bytes.Buffer
	printReconcileReport(&buf, result, sortedMonths)
	got := buf.String()

	checks := []struct {
		want string
		desc string
	}{
		{"PAYMENT RECONCILIATION REPORT", "banner"},
		{"Apr 2026", "month label"},
		{"Balance", "balance column header"},
		{"Alice", "Alice row"},
		{"Bob", "Bob row"},
		{"OK", "Bob paid in full → OK"},
		{"350/700", "Alice partial → 350/700"},
		{"-350", "Alice negative balance"},
		{"TOTAL DEBTS", "debts section"},
		{"Alice: 350 CZK", "Alice debt amount"},
		{"UNMATCHED TRANSACTIONS", "unmatched section"},
		{"Unknown", "unmatched sender"},
		{"MATCHED TRANSACTION DETAILS", "matched details section"},
		{"Alice Bank", "Alice matched sender"},
		{"Bob Bank", "Bob matched sender"},
	}
	for _, c := range checks {
		if !strings.Contains(got, c.want) {
			t.Errorf("missing %s: want %q in output:\n%s", c.desc, c.want, got)
		}
	}

	// No CREDITS section expected (no member has TotalBalance > 0)
	if strings.Contains(got, "TOTAL CREDITS") {
		t.Error("unexpected CREDITS section when no member has positive balance")
	}
}

func TestPrintReconcileReportUnpaidCell(t *testing.T) {
	t.Parallel()
	result := reconcile.Result{
		Members: map[string]reconcile.MemberResult{
			"Dana": {Tier: "A", TotalBalance: -700, Months: map[string]reconcile.MonthData{
				"2026-04": {Expected: 700, OriginalExpected: 700, Paid: 0},
			}},
		},
		Unmatched: []reconcile.Transaction{},
	}

	var buf bytes.Buffer
	printReconcileReport(&buf, result, []string{"2026-04"})
	got := buf.String()

	if !strings.Contains(got, "UNPAID 700") {
		t.Errorf("expected 'UNPAID 700' for zero-payment member, got:\n%s", got)
	}
}

func TestPrintReconcileReportDashCell(t *testing.T) {
	t.Parallel()
	result := reconcile.Result{
		Members: map[string]reconcile.MemberResult{
			"Eve": {Tier: "A", TotalBalance: 0, Months: map[string]reconcile.MonthData{
				"2026-04": {Expected: 0, Paid: 0},
			}},
		},
		Unmatched: []reconcile.Transaction{},
	}

	var buf bytes.Buffer
	printReconcileReport(&buf, result, []string{"2026-04"})
	got := buf.String()

	eveLine := ""
	for _, l := range strings.Split(got, "\n") {
		if strings.HasPrefix(strings.TrimSpace(l), "Eve") {
			eveLine = l
			break
		}
	}
	if eveLine == "" {
		t.Fatal("no Eve line found")
	}
	if !strings.Contains(eveLine, "-") {
		t.Errorf("expected '-' dash cell when expected=0 paid=0, Eve line: %q", eveLine)
	}
}

func TestPrintReconcileReportCreditsSection(t *testing.T) {
	t.Parallel()
	result := reconcile.Result{
		Members: map[string]reconcile.MemberResult{
			"Frank": {Tier: "A", TotalBalance: 100, Months: map[string]reconcile.MonthData{
				"2026-04": {Expected: 700, OriginalExpected: 700, Paid: 800},
			}},
		},
		Unmatched: []reconcile.Transaction{},
	}

	var buf bytes.Buffer
	printReconcileReport(&buf, result, []string{"2026-04"})
	got := buf.String()

	if !strings.Contains(got, "TOTAL CREDITS") {
		t.Errorf("expected CREDITS section, got:\n%s", got)
	}
	if !strings.Contains(got, "Frank: 100 CZK") {
		t.Errorf("expected 'Frank: 100 CZK', got:\n%s", got)
	}
}

func TestPrintReconcileReportReviewConfidence(t *testing.T) {
	t.Parallel()
	result := reconcile.Result{
		Members: map[string]reconcile.MemberResult{
			"Grace": {Tier: "A", TotalBalance: 0, Months: map[string]reconcile.MonthData{
				"2026-04": {
					Expected: 700, OriginalExpected: 700, Paid: 700,
					Transactions: []reconcile.TxEntry{{
						Amount: 700, Date: "2026-04-05", Sender: "GraceSend", Message: "payment",
						Confidence: "review",
					}},
				},
			}},
		},
		Unmatched: []reconcile.Transaction{},
	}

	var buf bytes.Buffer
	printReconcileReport(&buf, result, []string{"2026-04"})
	got := buf.String()

	if !strings.Contains(got, "[REVIEW]") {
		t.Errorf("expected '[REVIEW]' annotation for review-confidence tx, got:\n%s", got)
	}
}