using Microsoft.Data.Sqlite;
using ytLive.Models;

namespace ytLive.Services;

public partial class LayoutStore : IDisposable
{
    /// <summary>The last picked mic source name, or null if never chosen. Restored
    /// at startup so the sound bar reconnects to the same, already-vetted device.</summary>
    public string? LoadMicSourceName()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'MicSourceName';";
        var value = cmd.ExecuteScalar() as string;
        return string.IsNullOrWhiteSpace(value) ? null : value;
    }

    public void SaveMicSourceName(string? name)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'MicSourceName';";
        cmd.ExecuteNonQuery();
        if (string.IsNullOrWhiteSpace(name))
            return;

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('MicSourceName', $name);";
        insert.Parameters.AddWithValue("$name", name);
        insert.ExecuteNonQuery();
    }

    /// <summary>The global audio-sync offset in milliseconds (TASK 22), −500..500,
    /// default 0: positive delays the mix (audio ahead of video), negative
    /// advances it (audio behind video). Restored at startup so the mixer starts
    /// on the user's offset.</summary>
    public int LoadAudioSyncOffsetMs()
    {
        var value = GetSetting("Audio.SyncOffsetMs");
        return int.TryParse(value, out var ms) ? Math.Clamp(ms, -500, 500) : 0;
    }

    public void SaveAudioSyncOffsetMs(int ms)
    {
        UpsertSetting("Audio.SyncOffsetMs", Math.Clamp(ms, -500, 500).ToString());
    }

    /// <summary>The user's chosen record output folder (TASK 18), or null to use the
    /// default <c>%APPDATA%\ytLlive\recordings</c>. Restored at startup.</summary>
    public string? LoadRecordFolder()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'RecordFolder';";
        var value = cmd.ExecuteScalar() as string;
        return string.IsNullOrWhiteSpace(value) ? null : value;
    }

    public void SaveRecordFolder(string? folder)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'RecordFolder';";
        cmd.ExecuteNonQuery();
        if (string.IsNullOrWhiteSpace(folder))
            return;

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('RecordFolder', $folder);";
        insert.Parameters.AddWithValue("$folder", folder);
        insert.ExecuteNonQuery();
    }

    /// <summary>The cached reusable stream (TASK 5), or null if never created.
    /// Survives restarts so the pump has its RTMP URL the moment go-live starts
    /// instead of waiting on the YouTube round-trip.</summary>
    public ReusableStream? LoadReusableStream()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'ReusableStream';";
        var value = cmd.ExecuteScalar() as string;
        if (string.IsNullOrWhiteSpace(value)) return null;

        var parts = value.Split('\u001F');
        return parts.Length == 3
            ? new ReusableStream(parts[0], parts[1], parts[2])
            : null;
    }

    public void SaveReusableStream(ReusableStream? stream)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'ReusableStream';";
        cmd.ExecuteNonQuery();
        if (stream == null) return;

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('ReusableStream', $value);";
        insert.Parameters.AddWithValue("$value", $"{stream.Id}\u001F{stream.IngestionAddress}\u001F{stream.StreamName}");
        insert.ExecuteNonQuery();
    }

    public string? LoadLicenseKey()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'LicenseKey';";
        var value = cmd.ExecuteScalar() as string;
        return string.IsNullOrWhiteSpace(value) ? null : value;
    }

    public void SaveLicenseKey(string? key)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'LicenseKey';";
        cmd.ExecuteNonQuery();
        if (string.IsNullOrWhiteSpace(key)) return;

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('LicenseKey', $value);";
        insert.Parameters.AddWithValue("$value", key);
        insert.ExecuteNonQuery();
    }

    /// <summary>When the license was last validated online (ISO 8601), or null if never.</summary>
    public DateTime? LoadLicenseValidatedAt()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'LicenseValidatedAt';";
        var value = cmd.ExecuteScalar() as string;
        if (string.IsNullOrWhiteSpace(value)) return null;
        return DateTime.TryParse(value, out var dt) ? dt : null;
    }

    public void SaveLicenseValidatedAt(DateTime? dt)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'LicenseValidatedAt';";
        cmd.ExecuteNonQuery();
        if (dt == null) return;

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('LicenseValidatedAt', $value);";
        insert.Parameters.AddWithValue("$value", dt.Value.ToString("o"));
        insert.ExecuteNonQuery();
    }

    /// <summary>Cached premium state (1 = premium, 0 = free). Used for offline
    /// grace period — the app checks online at startup but uses this cached
    /// value when offline.</summary>
    public bool LoadIsPremium()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'IsPremium';";
        var value = cmd.ExecuteScalar() as string;
        return value == "1";
    }

    public void SaveIsPremium(bool isPremium)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = 'IsPremium';";
        cmd.ExecuteNonQuery();

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ('IsPremium', $value);";
        insert.Parameters.AddWithValue("$value", isPremium ? "1" : "0");
        insert.ExecuteNonQuery();
    }

    public (string TransitionType, double DurationMs) LoadTransitionSettings()
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = 'TransitionType';";
        var type = cmd.ExecuteScalar() as string;

        using var cmd2 = _connection.CreateCommand();
        cmd2.CommandText = "SELECT Value FROM Settings WHERE Key = 'TransitionDurationMs';";
        var dur = cmd2.ExecuteScalar() as string;

        return (type ?? "Fade", dur != null && double.TryParse(dur, out var d) ? d : 300);
    }

    public void SaveTransitionSettings(string transitionType, double durationMs)
    {
        UpsertSetting("TransitionType", transitionType);
        UpsertSetting("TransitionDurationMs", durationMs.ToString("F0"));
    }

    // ─── Broadcast metadata (broadcast pull-out) + window geometry ───

    public Models.BroadcastMetadata LoadBroadcastMetadata()
    {
        return new Models.BroadcastMetadata
        {
            Title = GetSetting("Broadcast.Title") ?? string.Empty,
            Description = GetSetting("Broadcast.Description") ?? string.Empty,
            TagsCsv = GetSetting("Broadcast.TagsCsv") ?? string.Empty,
            Visibility = GetSetting("Broadcast.Visibility") ?? "private",
            MadeForKids = GetSetting("Broadcast.MadeForKids") == "1",
            ScheduledStartTime = DateTime.TryParse(GetSetting("Broadcast.ScheduledStartTime"), out var t) ? t : null,
        };
    }

    public void SaveBroadcastMetadata(Models.BroadcastMetadata meta)
    {
        UpsertSetting("Broadcast.Title", meta.Title);
        UpsertSetting("Broadcast.Description", meta.Description);
        UpsertSetting("Broadcast.TagsCsv", meta.TagsCsv);
        UpsertSetting("Broadcast.Visibility", meta.Visibility);
        UpsertSetting("Broadcast.MadeForKids", meta.MadeForKids ? "1" : "0");
        UpsertSetting("Broadcast.ScheduledStartTime",
            meta.ScheduledStartTime?.ToString("o") ?? string.Empty);
    }

    // ─── Hotkey bindings (TASK 20 step 2) ───

    /// <summary>
    /// Load saved hotkey bindings. Returns only entries that have been explicitly
    /// saved — missing HotkeyIds are unbound (not in the returned dictionary).
    /// Caller fills in defaults for any missing entries as needed.
    /// </summary>
    public Dictionary<HotkeyId, HotkeyChord> LoadHotkeyBindings()
    {
        var result = new Dictionary<HotkeyId, HotkeyChord>();
        foreach (HotkeyId id in Enum.GetValues(typeof(HotkeyId)))
        {
            var raw = GetSetting($"Hotkey.{id}");
            if (raw == null) continue; // not saved = unbound
            if (raw == "none") continue; // explicitly unbound
            try
            {
                result[id] = HotkeyChord.ParseStorage(raw);
            }
            catch (FormatException)
            {
                // corrupt entry — skip, will fall back to default
            }
        }
        return result;
    }

    /// <summary>
    /// Save hotkey bindings. Null entries in the dictionary mean "unbound" (stored
    /// as "none"). Only the provided entries are saved; previously saved entries
    /// for HotkeyIds not in the dictionary are deleted.
    /// </summary>
    public void SaveHotkeyBindings(Dictionary<HotkeyId, HotkeyChord?> bindings)
    {
        // Delete all existing hotkey settings first
        foreach (HotkeyId id in Enum.GetValues(typeof(HotkeyId)))
        {
            using var cmd = _connection.CreateCommand();
            cmd.CommandText = "DELETE FROM Settings WHERE Key = $key;";
            cmd.Parameters.AddWithValue("$key", $"Hotkey.{id}");
            cmd.ExecuteNonQuery();
        }

        // Save the new bindings
        foreach (var (id, chord) in bindings)
        {
            var value = chord?.ToString() ?? "none";
            UpsertSetting($"Hotkey.{id}", value);
        }
    }

    public (double Left, double Top, double Width, double Height, string State)? LoadWindowState()
    {
        var left = GetSetting("Window.Left");
        var top = GetSetting("Window.Top");
        var width = GetSetting("Window.Width");
        var height = GetSetting("Window.Height");
        var state = GetSetting("Window.State");
        if (left == null || top == null || width == null || height == null) return null;
        if (!double.TryParse(left, out var l) || !double.TryParse(top, out var t) ||
            !double.TryParse(width, out var w) || !double.TryParse(height, out var h))
            return null;
        return (l, t, w, h, state ?? "Normal");
    }

    public void SaveWindowState(double left, double top, double width, double height, string state)
    {
        UpsertSetting("Window.Left", left.ToString("F0"));
        UpsertSetting("Window.Top", top.ToString("F0"));
        UpsertSetting("Window.Width", width.ToString("F0"));
        UpsertSetting("Window.Height", height.ToString("F0"));
        UpsertSetting("Window.State", state);
    }

    private string? GetSetting(string key)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Value FROM Settings WHERE Key = $key;";
        cmd.Parameters.AddWithValue("$key", key);
        return cmd.ExecuteScalar() as string;
    }

    private void UpsertSetting(string key, string value)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "DELETE FROM Settings WHERE Key = $key;";
        cmd.Parameters.AddWithValue("$key", key);
        cmd.ExecuteNonQuery();

        using var insert = _connection.CreateCommand();
        insert.CommandText = "INSERT INTO Settings (Key, Value) VALUES ($key, $value);";
        insert.Parameters.AddWithValue("$key", key);
        insert.Parameters.AddWithValue("$value", value);
        insert.ExecuteNonQuery();
    }
}