using Gpulse.WCT.DataAnalyzer.Core.Infrastructure.LocalData;
using Microsoft.EntityFrameworkCore;

namespace Gpulse.WCT.DataAnalyzer.Tests.Commands;

/// <summary>
/// RV-001：EF 迁移替代 EnsureCreated。验证两类场景：
/// 1. 全新库经迁移建全部表（CliTestHost 已覆盖，此处断言关键新表存在）。
/// 2. 既有 EnsureCreated 库（无迁移历史但有表）经 MigrateOrUpgradeAsync 升级后补齐
///    本变更新增的 3 张维度表 + test_scenario 的 3 列 FK。
/// </summary>
[TestFixture]
public class DatabaseMigrationInitializerTests
{
    /// <summary>全新库经迁移建表后，3 张新维度表存在。</summary>
    [Test]
    public async Task MigrateOrUpgrade_FreshDb_CreatesNewDimensionTables()
    {
        var dbPath = Path.Combine(Path.GetTempPath(), $"wct_fresh_{Guid.NewGuid():N}.db");
        try
        {
            await using var context = CreateContext(dbPath);
            await DatabaseMigrationInitializer.MigrateOrUpgradeAsync(context);

            Assert.Multiple(async () =>
            {
                Assert.That(await TableExistsAsync(context, "manufacturer"), Is.True);
                Assert.That(await TableExistsAsync(context, "car_model"), Is.True);
                Assert.That(await TableExistsAsync(context, "foreign_object"), Is.True);
            });
        }
        finally
        {
            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
            if (File.Exists(dbPath)) File.Delete(dbPath);
        }
    }

    /// <summary>既有 EnsureCreated 库（旧 schema：无新表/FK 列）经升级补齐。</summary>
    [Test]
    public async Task MigrateOrUpgrade_LegacyEnsureCreatedDb_AddsNewTablesAndFkColumns()
    {
        var dbPath = Path.Combine(Path.GetTempPath(), $"wct_legacy_{Guid.NewGuid():N}.db");
        try
        {
            // 1. 构造一个"旧 schema"库：test_scenario 无 manufacturer_id/car_model_id/foreign_object_id，
            //    无 __EFMigrationsHistory（模拟 EnsureCreated 既有库）
            CreateLegacyEnsureCreatedDatabase(dbPath);

            // 2. 运行升级
            await using var context = CreateContext(dbPath);
            await DatabaseMigrationInitializer.MigrateOrUpgradeAsync(context);

            // 3. 断言新维度表与 test_scenario 的新 FK 列已补齐
            Assert.Multiple(async () =>
            {
                Assert.That(await TableExistsAsync(context, "manufacturer"), Is.True);
                Assert.That(await TableExistsAsync(context, "car_model"), Is.True);
                Assert.That(await TableExistsAsync(context, "foreign_object"), Is.True);
                Assert.That(await ColumnExistsAsync(context, "test_scenario", "manufacturer_id"), Is.True);
                Assert.That(await ColumnExistsAsync(context, "test_scenario", "car_model_id"), Is.True);
                Assert.That(await ColumnExistsAsync(context, "test_scenario", "foreign_object_id"), Is.True);
            });
        }
        finally
        {
            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
            if (File.Exists(dbPath)) File.Delete(dbPath);
        }
    }

    private static WctMinerDbContext CreateContext(string dbPath)
    {
        var dir = Path.GetDirectoryName(dbPath);
        if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
            Directory.CreateDirectory(dir);

        var options = new DbContextOptionsBuilder<WctMinerDbContext>()
            .UseSqlite($"Data Source={dbPath};Pooling=False")
            .Options;
        return new WctMinerDbContext(options);
    }

    private static void CreateLegacyEnsureCreatedDatabase(string dbPath)
    {
        using var connection = new Microsoft.Data.Sqlite.SqliteConnection($"Data Source={dbPath};Pooling=False");
        connection.Open();
        using var cmd = connection.CreateCommand();
        cmd.CommandText = """
            CREATE TABLE test_scenario (
                id TEXT NOT NULL PRIMARY KEY,
                tx_panel_id TEXT,
                tx_hardware_id TEXT,
                tx_software_id TEXT,
                rx_type_id TEXT,
                test_purpose TEXT,
                test_date TEXT,
                test_sequence INTEGER,
                is_deleted INTEGER NOT NULL DEFAULT 0,
                created_at TEXT NOT NULL DEFAULT (datetime('now'))
            );
            CREATE TABLE tx_panel (id TEXT NOT NULL PRIMARY KEY, name TEXT, is_deleted INTEGER NOT NULL DEFAULT 0, created_at TEXT NOT NULL DEFAULT (datetime('now')));
            """;
        cmd.ExecuteNonQuery();
    }

    private static async Task<bool> TableExistsAsync(WctMinerDbContext context, string tableName)
    {
        var count = await context.Database.SqlQueryRaw<long>(
            $"SELECT count(*) AS Value FROM sqlite_master WHERE type='table' AND name = '{tableName}'").FirstOrDefaultAsync();
        return count > 0;
    }

    private static async Task<bool> ColumnExistsAsync(WctMinerDbContext context, string table, string column)
    {
        var count = await context.Database.SqlQueryRaw<long>(
            $"SELECT count(*) AS Value FROM pragma_table_info('{table}') WHERE name = '{column}'").FirstOrDefaultAsync();
        return count > 0;
    }
}