using System.Data.SQLite;
using Dapper;
using OCES.Resonance.Core;

namespace Core.Tests;

public class DatabaseTests
{
    static string NewDbName() => $"test_{Guid.NewGuid():N}";

    [Fact]
    public void InitializeDatabase_ShouldCreateAudioFilesTable()
    {
        string dbName = NewDbName();
        string dbPath = $"{Path.Combine(PreferencesManager.GetDefaultDatabasePath(), dbName)}.rdb";

        try
        {
            // Act
            Database.InitializeDatabase(dbName);

            // Assert — 用自己的 SQLite 连接验证
            using var conn = new SQLiteConnection($"Data Source={dbPath};Version=3;");
            conn.Open();

            // 1. 表存在
            var tableCount = conn.ExecuteScalar<int>(
                "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='audio_files';");
            Assert.Equal(1, tableCount);

            // 2. 核心列存在（抽查）
            var columns = conn.Query<string>(
                "SELECT name FROM pragma_table_info('audio_files') ORDER BY cid;").ToHashSet();
            Assert.Contains("id", columns);
            Assert.Contains("unique_id", columns);
            Assert.Contains("md5", columns);
            Assert.Contains("path", columns);
            Assert.Contains("filename", columns);
            Assert.Contains("duration", columns);
            Assert.Contains("bpm", columns);
            Assert.Contains("description", columns);

            // 3. 索引存在
            var indexes = conn.Query<string>(
                "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='audio_files';")
                .ToHashSet();
            Assert.Contains("idx_file_name", indexes);
            Assert.Contains("idx_md5", indexes);
            Assert.Contains("idx_path", indexes);
            Assert.Contains("idx_unique_id", indexes);
            Assert.Contains("idx_description", indexes);
        }
        finally
        {
            if (File.Exists(dbPath)) File.Delete(dbPath);
        }
    }

    [Fact]
    public void InitializeDatabase_ShouldBeIdempotent()
    {
        string dbName = NewDbName();
        string dbPath = $"{Path.Combine(PreferencesManager.GetDefaultDatabasePath(), dbName)}.rdb";

        try
        {
            // Act — 连续调用两次
            Database.InitializeDatabase(dbName);
            Exception? exception = Record.Exception(() => Database.InitializeDatabase(dbName));

            // Assert — 不应抛出异常
            Assert.Null(exception);

            // 表仍然只有一个
            using var conn = new SQLiteConnection($"Data Source={dbPath};Version=3;");
            conn.Open();
            var tableCount = conn.ExecuteScalar<int>(
                "SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='audio_files';");
            Assert.Equal(1, tableCount);
        }
        finally
        {
            if (File.Exists(dbPath)) File.Delete(dbPath);
        }
    }
    
    #region 读取方法测试
    
    private static AudioFileMeta CreateSampleMeta(int id = 0)
    {
        var guid = Guid.NewGuid().ToString("N");
        return new AudioFileMeta
        {
            Id = id,
            UniqueId = guid,
            ShortId = "TEST",
            Md5 = guid[..16],
            Path = $"/test/path/{guid}.wav",
            Filename = $"{guid}.wav",
            Folder = "test",
            Directory = "/test/path",
            Duration = 2.5,
            BitDepth = 24,
            Channels = 2,
            SampleRate = 48000,
            Type = "WAV",
            DateAdded = DateTime.UtcNow,
            LastWriteTime = DateTime.UtcNow,
            CreationTime = DateTime.UtcNow,
            Description = "Test explosion sound",
            Category = "SFX",
            Keywords = "test,boom,explosion",
            FxName = "Test Explosion Boom"
        };
    }

    private static string GetDefaultDbPath() =>
        Path.Combine(PreferencesManager.GetDefaultDatabasePath(), "default.rdb");

    private static void DeleteTestEntries(params string[] uniqueIds)
    {
        using var conn = new SQLiteConnection($"Data Source={GetDefaultDbPath()};Version=3;");
        conn.Open();
        foreach (var uid in uniqueIds)
            conn.Execute("DELETE FROM audio_files WHERE unique_id = @UniqueId", new { UniqueId = uid });
    }

    [Fact]
    public void AddEntry_Then_GetEntryById_ShouldReturnRecord()
    {
        Database.InitializeDatabase();
        var meta = CreateSampleMeta();
        Assert.True(Database.AddEntry(meta));

        try
        {
            var retrieved = Database.GetEntryById(meta.Id);
            Assert.NotNull(retrieved);
            Assert.Equal(meta.UniqueId, retrieved!.UniqueId);
            Assert.Equal(meta.Filename, retrieved.Filename);
            Assert.Equal(meta.Duration, retrieved.Duration);
        }
        finally
        {
            DeleteTestEntries(meta.UniqueId);
        }
    }

    [Fact]
    public void GetEntryById_NotFound_ShouldReturnNull()
    {
        Database.InitializeDatabase();
        var result = Database.GetEntryById(int.MaxValue);
        Assert.Null(result);
    }

    [Fact]
    public void AddEntry_Then_GetEntryByUniqueId_ShouldReturnRecord()
    {
        Database.InitializeDatabase();
        var meta = CreateSampleMeta();
        Database.AddEntry(meta);

        try
        {
            var retrieved = Database.GetEntryByUniqueId(meta.UniqueId);
            Assert.NotNull(retrieved);
            Assert.Equal(meta.Md5, retrieved!.Md5);
        }
        finally
        {
            DeleteTestEntries(meta.UniqueId);
        }
    }

    [Fact]
    public void GetEntryByUniqueId_NotFound_ShouldReturnNull()
    {
        Database.InitializeDatabase();
        var result = Database.GetEntryByUniqueId("nonexistent-guid");
        Assert.Null(result);
    }

    [Fact]
    public void QueryEntries_ShouldFilterBySearchText()
    {
        Database.InitializeDatabase();
        var meta = CreateSampleMeta();
        meta.Description = "Unique underwater ambience loop";
        meta.Keywords = "water,ocean,deep";
        Database.AddEntry(meta);

        try
        {
            var results = Database.QueryEntries(searchText: "underwater").ToList();
            Assert.Single(results);
            Assert.Equal(meta.UniqueId, results[0].UniqueId);

            var empty = Database.QueryEntries(searchText: "zzz_nonexistent_zzz").ToList();
            Assert.Empty(empty);
        }
        finally
        {
            DeleteTestEntries(meta.UniqueId);
        }
    }

    [Fact]
    public void QueryEntries_ShouldFilterByDuration()
    {
        Database.InitializeDatabase();
        var shortMeta = CreateSampleMeta();
        shortMeta.Duration = 1.0;
        var longMeta = CreateSampleMeta();
        longMeta.Duration = 10.0;

        Database.AddEntries(new[] { shortMeta, longMeta });

        try
        {
            var results = Database.QueryEntries(minDuration: 5.0).ToList();
            Assert.Single(results);
            Assert.Equal(longMeta.UniqueId, results[0].UniqueId);
        }
        finally
        {
            DeleteTestEntries(shortMeta.UniqueId, longMeta.UniqueId);
        }
    }

    [Fact]
    public void QueryEntries_ShouldSupportPagination()
    {
        Database.InitializeDatabase();
        var entries = Enumerable.Range(0, 5).Select(_ => CreateSampleMeta()).ToList();
        Database.AddEntries(entries);

        try
        {
            var page = Database.QueryEntries(limit: 2, offset: 1).ToList();
            Assert.Equal(2, page.Count);
        }
        finally
        {
            DeleteTestEntries(entries.Select(e => e.UniqueId).ToArray());
        }
    }

    [Fact]
    public void SearchEntries_ShouldFindByKeyword()
    {
        Database.InitializeDatabase();
        var meta = CreateSampleMeta();
        meta.Keywords = "magic,spell,fireball";
        Database.AddEntry(meta);

        try
        {
            var results = Database.SearchEntries("fireball").ToList();
            Assert.Single(results);
        }
        finally
        {
            DeleteTestEntries(meta.UniqueId);
        }
    }

    [Fact]
    public void GetTotalCount_ShouldRespectSearchFilter()
    {
        Database.InitializeDatabase();
        var meta = CreateSampleMeta();
        var uniqueTag = $"UNIQUE_TAG_{meta.UniqueId[..8]}";
        meta.Description = uniqueTag;
        Database.AddEntry(meta);

        try
        {
            var count = Database.GetTotalCount(searchText: uniqueTag);
            Assert.Equal(1, count);
        }
        finally
        {
            DeleteTestEntries(meta.UniqueId);
        }
    }

    [Fact]
    public void AddEntries_ShouldReturnCorrectCount()
    {
        Database.InitializeDatabase();
        var entries = Enumerable.Range(0, 3).Select(_ => CreateSampleMeta()).ToList();

        try
        {
            var count = Database.AddEntries(entries);
            Assert.Equal(3, count);
        }
        finally
        {
            DeleteTestEntries(entries.Select(e => e.UniqueId).ToArray());
        }
    }

    #endregion
}