using Microsoft.AspNetCore.DataProtection;
using Microsoft.EntityFrameworkCore;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;

namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Tests;

public class MediumPersistenceRegressionTests
{
    private static ScadaBridgeDbContext Create(bool protectedWrites = true)
    {
        var options = new DbContextOptionsBuilder<ScadaBridgeDbContext>()
            .UseSqlite("Data Source=:memory:;Foreign Keys=False").Options;
        var db = protectedWrites ? new ScadaBridgeDbContext(options, new EphemeralDataProtectionProvider())
            : new ScadaBridgeDbContext(options);
        db.Database.OpenConnection();
        db.Database.EnsureCreated();
        return db;
    }

    [Fact]
    public async Task DL1_UniqueNameCannotExistAtTwoSites()
    {
        await using var db = Create();
        db.Instances.Add(new Instance("shared-pump") { SiteId = 1, TemplateId = 1 });
        await db.SaveChangesAsync();
        db.Instances.Add(new Instance("shared-pump") { SiteId = 2, TemplateId = 1 });
        await Assert.ThrowsAsync<InstanceNameConflictException>(() => db.SaveChangesAsync());
    }

    [Fact]
    public async Task DL2_ConvertersDoNotShareKeysAcrossProviders()
    {
        await using var connection = new Microsoft.Data.Sqlite.SqliteConnection("Data Source=:memory:;Foreign Keys=False");
        await connection.OpenAsync();
        var options = new DbContextOptionsBuilder<ScadaBridgeDbContext>().UseSqlite(connection).Options;
        await using (var first = new ScadaBridgeDbContext(options, new EphemeralDataProtectionProvider()))
        {
            await first.Database.EnsureCreatedAsync();
            first.DataConnections.Add(new DataConnection("key-isolation", "OpcUa", 1) { PrimaryConfiguration = "{}" });
            await first.SaveChangesAsync();
        }
        await using var wrongKey = new ScadaBridgeDbContext(options, new EphemeralDataProtectionProvider());
        await Assert.ThrowsAsync<System.Security.Cryptography.CryptographicException>(() =>
            wrongKey.DataConnections.SingleAsync(c => c.Name == "key-isolation"));
    }

    [Fact]
    public async Task DL2_LegacyUpgradeProtectsBothColumnsAndIsIdempotent()
    {
        await using var db = Create();
        await db.Database.ExecuteSqlRawAsync("INSERT INTO DataConnections (SiteId, Name, Protocol, PrimaryConfiguration, BackupConfiguration, FailoverRetryCount) VALUES (1, 'legacy', 'OpcUa', {0}, {1}, 3)",
            """{"Password":"primary-secret"}""", """{"Password":"backup-secret"}""");
        await DataConnectionSecretUpgrade.UpgradeAsync(db);
        await using var command = db.Database.GetDbConnection().CreateCommand();
        command.CommandText = "SELECT PrimaryConfiguration FROM DataConnections WHERE Name = 'legacy'";
        var first = (string)(await command.ExecuteScalarAsync())!;
        Assert.DoesNotContain("primary-secret", first);
        await DataConnectionSecretUpgrade.UpgradeAsync(db);
        Assert.Equal(first, (string)(await command.ExecuteScalarAsync())!);
        var row = await db.DataConnections.SingleAsync(c => c.Name == "legacy");
        Assert.Contains("primary-secret", row.PrimaryConfiguration);
        Assert.Contains("backup-secret", row.BackupConfiguration);
    }

    [Theory]
    [InlineData(false)]
    [InlineData(true)]
    public async Task DL2_DataConnectionConfigurationIsEncryptedAndRoundTrips(bool backup)
    {
        await using var db = Create();
        const string secret = "{\"Password\":\"medium-secret-never-plaintext\"}";
        var connection = new DataConnection("test", "OpcUa", 1);
        if (backup) connection.BackupConfiguration = secret; else connection.PrimaryConfiguration = secret;
        db.DataConnections.Add(connection);
        await db.SaveChangesAsync();
        db.ChangeTracker.Clear();
        await using var cmd = db.Database.GetDbConnection().CreateCommand();
        cmd.CommandText = $"SELECT {(backup ? "BackupConfiguration" : "PrimaryConfiguration")} FROM DataConnections WHERE Id = {connection.Id}";
        var raw = Assert.IsType<string>(await cmd.ExecuteScalarAsync());
        Assert.DoesNotContain("medium-secret", raw);
        var loaded = await db.DataConnections.SingleAsync(c => c.Id == connection.Id);
        Assert.Equal(secret, backup ? loaded.BackupConfiguration : loaded.PrimaryConfiguration);
    }

    [Theory]
    [InlineData(false)]
    [InlineData(true)]
    public async Task DL2_SchemaOnlyContextCannotWriteProtocolCredentials(bool backup)
    {
        await using var db = Create(false);
        var connection = new DataConnection("test", "OpcUa", 1);
        if (backup) connection.BackupConfiguration = "{}"; else connection.PrimaryConfiguration = "{}";
        db.DataConnections.Add(connection);
        var error = await Assert.ThrowsAsync<InvalidOperationException>(() => db.SaveChangesAsync());
        Assert.Contains("Data Protection", error.Message);
    }
}