using Microsoft.Data.Sqlite;

namespace TentacleBot.Services.Memory;

public class DatabaseInitializer
{
    private readonly string _connectionString;

    public DatabaseInitializer(string dbPath)
    {
        var directory = Path.GetDirectoryName(dbPath);
        if (!string.IsNullOrWhiteSpace(directory) && !Directory.Exists(directory))
        {
            Directory.CreateDirectory(directory);
        }

        _connectionString = $"Data Source={dbPath}";
    }

    public string ConnectionString => _connectionString;

    public void Initialize()
    {
        using var connection = new SqliteConnection(_connectionString);
        connection.Open();

        using var cmd = connection.CreateCommand();
        cmd.CommandText = @"
            CREATE TABLE IF NOT EXISTS user_rules (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                user_id TEXT NOT NULL,
                rule_text TEXT NOT NULL,
                created_at TEXT NOT NULL DEFAULT (datetime('now'))
            );

            CREATE TABLE IF NOT EXISTS memories (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                user_id TEXT NOT NULL,
                content TEXT NOT NULL,
                category TEXT,
                importance INTEGER NOT NULL DEFAULT 5,
                created_at TEXT NOT NULL DEFAULT (datetime('now')),
                last_accessed TEXT
            );

            CREATE VIRTUAL TABLE IF NOT EXISTS memories_fts USING fts5(
                content, content=memories, content_rowid=id
            );

            CREATE TRIGGER IF NOT EXISTS memories_ai AFTER INSERT ON memories BEGIN
                INSERT INTO memories_fts(rowid, content) VALUES (new.id, new.content);
            END;

            CREATE TRIGGER IF NOT EXISTS memories_ad AFTER DELETE ON memories BEGIN
                INSERT INTO memories_fts(memories_fts, rowid, content) VALUES ('delete', old.id, old.content);
            END;

            CREATE TRIGGER IF NOT EXISTS memories_au AFTER UPDATE ON memories BEGIN
                INSERT INTO memories_fts(memories_fts, rowid, content) VALUES ('delete', old.id, old.content);
                INSERT INTO memories_fts(rowid, content) VALUES (new.id, new.content);
            END;
        ";
        cmd.ExecuteNonQuery();
    }
}