using MoneyMap.Models;
using MoneyMap.Services;
using MoneyMap.Tests.TestHelpers;

namespace MoneyMap.Tests.Services;

public class AccountServiceTests
{
    [Fact]
    public async Task GetAllAccountsWithStatsAsync_ReturnsAccountsWithTransactionCounts()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account1 = new Account
        {
            Id = 1,
            Institution = "Bank A",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "John Doe"
        };
        var account2 = new Account
        {
            Id = 2,
            Institution = "Bank B",
            AccountType = AccountType.Savings,
            Last4 = "5678",
            Owner = "Jane Smith"
        };
        context.Accounts.AddRange(account1, account2);

        var transaction1 = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1
        };
        var transaction2 = new Transaction
        {
            Date = DateTime.Now,
            Amount = -25.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1
        };
        context.Transactions.AddRange(transaction1, transaction2);
        await context.SaveChangesAsync();

        // Act
        var result = await service.GetAllAccountsWithStatsAsync();

        // Assert
        Assert.Equal(2, result.Count);
        var account1Stats = result.First(a => a.Id == 1);
        Assert.Equal(2, account1Stats.TransactionCount);
        var account2Stats = result.First(a => a.Id == 2);
        Assert.Equal(0, account2Stats.TransactionCount);
    }

    [Fact]
    public async Task CanDeleteAccountAsync_ReturnsFalse_WhenAccountHasTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.CanDeleteAccountAsync(1);

        // Assert
        Assert.False(result.CanDelete);
        Assert.Contains("transaction", result.Reason, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task CanDeleteAccountAsync_ReturnsTrue_WhenAccountHasNoTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);
        await context.SaveChangesAsync();

        // Act
        var result = await service.CanDeleteAccountAsync(1);

        // Assert
        Assert.True(result.CanDelete);
    }

    [Fact]
    public async Task DeleteAccountAsync_SuccessfullyDeletesAccount_WhenNoTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);
        await context.SaveChangesAsync();

        // Act
        var result = await service.DeleteAccountAsync(1);

        // Assert
        Assert.True(result.Success);
        Assert.Empty(context.Accounts);
    }

    [Fact]
    public async Task DeleteAccountAsync_FailsToDelete_WhenAccountHasTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.DeleteAccountAsync(1);

        // Assert
        Assert.False(result.Success);
        Assert.Single(context.Accounts);
    }

    [Fact]
    public async Task GetAccountDetailsAsync_ReturnsFullDetails_WithCardsAndCounts()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new AccountService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "9999",
            Owner = "Test Owner"
        };
        context.Cards.Add(card);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1,
            CardId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.GetAccountDetailsAsync(1);

        // Assert
        Assert.NotNull(result);
        Assert.Equal(1, result.Account.Id);
        Assert.Single(result.Cards);
        Assert.Equal(1, result.Cards[0].TransactionCount);
        Assert.Equal(1, result.TransactionCount);
    }
}