-- Схема базы данных для AnonBot
-- SQLite3 совместимая схема

-- Таблица пользователей
CREATE TABLE users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    telegram_id INTEGER UNIQUE NOT NULL,
    username TEXT,
    first_name TEXT NOT NULL,
    last_name TEXT,
    chat_id INTEGER NOT NULL,
    profile_link TEXT UNIQUE NOT NULL,
    is_active BOOLEAN DEFAULT TRUE,
    is_superuser BOOLEAN DEFAULT FALSE,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    banned_until DATETIME,
    ban_reason TEXT
);

-- Таблица вопросов
CREATE TABLE questions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    from_user_id INTEGER,
    to_user_id INTEGER NOT NULL,
    message_text TEXT NOT NULL,
    answer_text TEXT,
    is_anonymous BOOLEAN DEFAULT TRUE,
    message_id INTEGER,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    answered_at DATETIME,
    is_read BOOLEAN DEFAULT FALSE,
    status TEXT DEFAULT 'pending' CHECK (status IN ('pending', 'answered', 'rejected', 'deleted')),
    user_question_number INTEGER,
    
    -- Внешние ключи
    FOREIGN KEY (from_user_id) REFERENCES users(telegram_id) ON DELETE CASCADE,
    FOREIGN KEY (to_user_id) REFERENCES users(telegram_id) ON DELETE CASCADE
);

-- Таблица блокировок
CREATE TABLE user_blocks (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    blocker_id INTEGER NOT NULL,
    blocked_id INTEGER NOT NULL,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    
    -- Внешние ключи и уникальность
    FOREIGN KEY (blocker_id) REFERENCES users(telegram_id) ON DELETE CASCADE,
    FOREIGN KEY (blocked_id) REFERENCES users(telegram_id) ON DELETE CASCADE,
    UNIQUE(blocker_id, blocked_id)
);

-- Таблица настроек пользователя
CREATE TABLE user_settings (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER UNIQUE NOT NULL,
    allow_questions BOOLEAN DEFAULT TRUE,
    notify_new_questions BOOLEAN DEFAULT TRUE,
    notify_answers BOOLEAN DEFAULT TRUE,
    language TEXT DEFAULT 'ru',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    
    -- Внешний ключ
    FOREIGN KEY (user_id) REFERENCES users(telegram_id) ON DELETE CASCADE
);

-- Индексы для оптимизации запросов
CREATE INDEX idx_users_telegram_id ON users(telegram_id);
CREATE INDEX idx_users_profile_link ON users(profile_link);
CREATE INDEX idx_users_is_active ON users(is_active);
CREATE INDEX idx_users_is_superuser ON users(is_superuser);

CREATE INDEX idx_questions_to_user_id ON questions(to_user_id);
CREATE INDEX idx_questions_from_user_id ON questions(from_user_id);
CREATE INDEX idx_questions_status ON questions(status);
CREATE INDEX idx_questions_created_at ON questions(created_at);
CREATE INDEX idx_questions_is_read ON questions(is_read);
CREATE INDEX idx_questions_user_question_number ON questions(to_user_id, user_question_number);
CREATE UNIQUE INDEX idx_questions_user_number_unique ON questions(to_user_id, user_question_number) WHERE status != 'deleted';

CREATE INDEX idx_user_blocks_blocker_id ON user_blocks(blocker_id);
CREATE INDEX idx_user_blocks_blocked_id ON user_blocks(blocked_id);
CREATE INDEX idx_user_blocks_created_at ON user_blocks(created_at);

CREATE INDEX idx_user_settings_user_id ON user_settings(user_id);

-- Триггер для автоматического обновления updated_at в users
CREATE TRIGGER update_users_updated_at
AFTER UPDATE ON users
FOR EACH ROW
BEGIN
    UPDATE users SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id;
END;

-- Триггер для автоматического обновления updated_at в user_settings
CREATE TRIGGER update_user_settings_updated_at
AFTER UPDATE ON user_settings
FOR EACH ROW
BEGIN
    UPDATE user_settings SET updated_at = CURRENT_TIMESTAMP WHERE id = NEW.id;
END;

-- Триггер для автоматического создания настроек при добавлении пользователя
CREATE TRIGGER create_user_settings
AFTER INSERT ON users
FOR EACH ROW
BEGIN
    INSERT OR IGNORE INTO user_settings (user_id) VALUES (NEW.telegram_id);
END;

-- Триггер для автоматического вычисления user_question_number при вставке
CREATE TRIGGER calculate_user_question_number
AFTER INSERT ON questions
FOR EACH ROW
WHEN NEW.user_question_number IS NULL
BEGIN
    UPDATE questions 
    SET user_question_number = (
        SELECT COALESCE(MAX(user_question_number), 0) + 1 
        FROM questions q2 
        WHERE q2.to_user_id = NEW.to_user_id
        AND q2.status != 'deleted'
    )
    WHERE id = NEW.id;
END;

-- Триггер для пересчета номеров при удалении вопроса
CREATE TRIGGER recalculate_user_question_numbers_on_delete
AFTER UPDATE ON questions
FOR EACH ROW
WHEN NEW.status = 'deleted' AND OLD.status != 'deleted'
BEGIN
    -- Устанавливаем user_question_number в NULL для удаленного вопроса
    UPDATE questions 
    SET user_question_number = NULL
    WHERE id = NEW.id;
    
    -- Пересчитываем номера для всех вопросов пользователя после удаленного
    UPDATE questions 
    SET user_question_number = user_question_number - 1
    WHERE to_user_id = NEW.to_user_id 
    AND user_question_number > OLD.user_question_number
    AND status != 'deleted'
    AND id != NEW.id;
END;