package common

import (
	"math"
	"testing"

	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
)

func TestSpendWalletBalanceClosesWithdrawableGap(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		Balance:           10_000,
		WithdrawalBalance: 10_000,
	}

	if err := SpendWalletBalance(&wallet, 8_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 2_000 || wallet.WithdrawalBalance != 2_000 {
		t.Fatalf("balances after expense = (%d, %d), want (2000, 2000)", wallet.Balance, wallet.WithdrawalBalance)
	}
	if err := ReserveWalletWithdrawal(&wallet, 10_000); err != ErrWalletBalance {
		t.Fatalf("withdrawal after expense error = %v, want %v", err, ErrWalletBalance)
	}
}

func TestSpendWalletBalanceConsumesNonWithdrawableBalanceFirst(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		Balance:           15_000,
		WithdrawalBalance: 10_000,
	}

	if err := SpendWalletBalance(&wallet, 4_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 11_000 || wallet.WithdrawalBalance != 10_000 {
		t.Fatalf("balances after first expense = (%d, %d), want (11000, 10000)", wallet.Balance, wallet.WithdrawalBalance)
	}
	if err := SpendWalletBalance(&wallet, 2_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 9_000 || wallet.WithdrawalBalance != 9_000 {
		t.Fatalf("balances after second expense = (%d, %d), want (9000, 9000)", wallet.Balance, wallet.WithdrawalBalance)
	}
}

func TestWithdrawalReserveAndRejectAreExactInverse(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		Balance:           10_000,
		WithdrawalBalance: 10_000,
	}

	if err := ReserveWalletWithdrawal(&wallet, 10_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 0 || wallet.WithdrawalBalance != 0 {
		t.Fatalf("reserved balances = (%d, %d), want (0, 0)", wallet.Balance, wallet.WithdrawalBalance)
	}
	if err := ReleaseWalletWithdrawal(&wallet, 10_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 10_000 || wallet.WithdrawalBalance != 10_000 {
		t.Fatalf("released balances = (%d, %d), want (10000, 10000)", wallet.Balance, wallet.WithdrawalBalance)
	}
}

func TestLegacyWithdrawalReleaseCannotExceedRemainingBalance(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		Balance:           2_000,
		WithdrawalBalance: 2_000,
	}

	if err := ReleaseLegacyWithdrawalBalance(&wallet, 8_000); err != nil {
		t.Fatal(err)
	}
	if wallet.Balance != 2_000 || wallet.WithdrawalBalance != 2_000 {
		t.Fatalf("legacy released balances = (%d, %d), want (2000, 2000)", wallet.Balance, wallet.WithdrawalBalance)
	}
}

func TestFrozenWalletRejectsNewDebits(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusFrozen),
		Balance:           10_000,
		WithdrawalBalance: 10_000,
	}

	if err := SpendWalletBalance(&wallet, 1); err != ErrWalletUnavailable {
		t.Fatalf("expense error = %v, want %v", err, ErrWalletUnavailable)
	}
	if err := ReserveWalletWithdrawal(&wallet, 1); err != ErrWalletUnavailable {
		t.Fatalf("withdrawal error = %v, want %v", err, ErrWalletUnavailable)
	}
}

func TestWithdrawalReleaseRejectsOverflow(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		Balance:           math.MaxInt64,
		WithdrawalBalance: math.MaxInt64,
	}

	if err := ReleaseWalletWithdrawal(&wallet, 1); err != ErrWalletOverflow {
		t.Fatalf("release error = %v, want %v", err, ErrWalletOverflow)
	}
}

func TestNewWithdrawalRejectionRestoresBothBalances(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		OwnerType:         "delivery",
		Balance:           2_000,
		WithdrawalBalance: 2_000,
	}
	application := models.WalletApplyCash{Amount: 8_000, BalanceReserved: true}

	released, err := ReleaseWithdrawalApplication(&wallet, application)
	if err != nil || !released {
		t.Fatalf("release = (%v, %v), want (true, nil)", released, err)
	}
	if wallet.Balance != 10_000 || wallet.WithdrawalBalance != 10_000 {
		t.Fatalf("released balances = (%d, %d), want (10000, 10000)", wallet.Balance, wallet.WithdrawalBalance)
	}
}

func TestLegacyOrganizationWithdrawalRejectionDoesNotMintBalance(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		OwnerType:         "delivery",
		Balance:           10_000,
		WithdrawalBalance: 10_000,
	}
	application := models.WalletApplyCash{Amount: 8_000}

	released, err := ReleaseWithdrawalApplication(&wallet, application)
	if err != nil || released {
		t.Fatalf("release = (%v, %v), want (false, nil)", released, err)
	}
	if wallet.Balance != 10_000 || wallet.WithdrawalBalance != 10_000 {
		t.Fatalf("legacy organization balances changed to (%d, %d)", wallet.Balance, wallet.WithdrawalBalance)
	}
}

func TestLegacyWithdrawalCompletionDebitsMissingBalances(t *testing.T) {
	tests := []struct {
		name              string
		ownerType         string
		withdrawalBalance int64
		wantBalance       int64
		wantWithdrawal    int64
	}{
		{
			name:              "client already reserved withdrawable balance",
			ownerType:         "user",
			withdrawalBalance: 2_000,
			wantBalance:       2_000,
			wantWithdrawal:    2_000,
		},
		{
			name:              "organization reserved neither balance",
			ownerType:         "delivery",
			withdrawalBalance: 10_000,
			wantBalance:       2_000,
			wantWithdrawal:    2_000,
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			wallet := models.WalletBasic{
				Entity:            NewEntity(StatusEnable),
				OwnerType:         test.ownerType,
				Balance:           10_000,
				WithdrawalBalance: test.withdrawalBalance,
			}
			changed, err := SettleLegacyWithdrawal(&wallet, models.WalletApplyCash{Amount: 8_000})
			if err != nil || !changed {
				t.Fatalf("settle = (%v, %v), want (true, nil)", changed, err)
			}
			if wallet.Balance != test.wantBalance || wallet.WithdrawalBalance != test.wantWithdrawal {
				t.Fatalf(
					"settled balances = (%d, %d), want (%d, %d)",
					wallet.Balance,
					wallet.WithdrawalBalance,
					test.wantBalance,
					test.wantWithdrawal,
				)
			}
		})
	}
}

func TestReservedWithdrawalCompletionDoesNotDebitAgain(t *testing.T) {
	wallet := models.WalletBasic{
		Entity:            NewEntity(StatusEnable),
		OwnerType:         "user",
		Balance:           2_000,
		WithdrawalBalance: 2_000,
	}
	application := models.WalletApplyCash{Amount: 8_000, BalanceReserved: true}

	changed, err := SettleLegacyWithdrawal(&wallet, application)
	if err != nil || changed {
		t.Fatalf("settle = (%v, %v), want (false, nil)", changed, err)
	}
	if wallet.Balance != 2_000 || wallet.WithdrawalBalance != 2_000 {
		t.Fatalf("reserved completion changed balances to (%d, %d)", wallet.Balance, wallet.WithdrawalBalance)
	}
}