-- User authentication and profiles
CREATE TABLE IF NOT EXISTS users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    username VARCHAR(255) UNIQUE NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    phone_number VARCHAR(50),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    is_active BOOLEAN DEFAULT true
);

-- Bot configurations
CREATE TABLE IF NOT EXISTS bots (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    description TEXT,
    llm_provider VARCHAR(100) NOT NULL,
    llm_config JSONB NOT NULL DEFAULT '{}',
    context_provider VARCHAR(100) NOT NULL,
    context_config JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    is_active BOOLEAN DEFAULT true
);

-- User sessions with optimized storage
CREATE TABLE IF NOT EXISTS user_sessions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,
    title VARCHAR(500) NOT NULL DEFAULT 'New Conversation',
    answer_mode VARCHAR(50) NOT NULL DEFAULT 'direct',
    context_data JSONB NOT NULL DEFAULT '{}',
    current_tool VARCHAR(255),
    message_count INTEGER NOT NULL DEFAULT 0,
    total_tokens INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    last_activity TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(user_id, bot_id, title)
);

-- Encrypted message history with analytics-friendly structure
CREATE TABLE IF NOT EXISTS message_history (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    session_id UUID NOT NULL REFERENCES user_sessions(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role VARCHAR(50) NOT NULL CHECK (role IN ('user', 'assistant', 'system')),
    content_encrypted TEXT NOT NULL,
    message_type VARCHAR(50) NOT NULL DEFAULT 'text',
    media_url TEXT,
    token_count INTEGER NOT NULL DEFAULT 0,
    processing_time_ms INTEGER,
    llm_model VARCHAR(100),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    message_index INTEGER NOT NULL
);

-- Bot channel configurations
CREATE TABLE IF NOT EXISTS bot_channels (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,
    channel_type VARCHAR(50) NOT NULL CHECK (channel_type IN ('web', 'whatsapp', 'meet', 'api')),
    config JSONB NOT NULL DEFAULT '{}',
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(bot_id, channel_type)
);

-- WhatsApp number mappings
CREATE TABLE IF NOT EXISTS whatsapp_numbers (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,
    phone_number VARCHAR(50) NOT NULL,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(phone_number, bot_id)
);

-- User email mappings for web channel
CREATE TABLE IF NOT EXISTS user_emails (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    email VARCHAR(255) NOT NULL,
    is_primary BOOLEAN DEFAULT false,
    verified BOOLEAN DEFAULT false,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(email)
);

-- Tools registry
CREATE TABLE IF NOT EXISTS tools (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) UNIQUE NOT NULL,
    description TEXT NOT NULL,
    parameters JSONB NOT NULL DEFAULT '{}',
    script TEXT NOT NULL,
    is_active BOOLEAN DEFAULT true,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Manual context injections
CREATE TABLE IF NOT EXISTS context_injections (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    session_id UUID NOT NULL REFERENCES user_sessions(id) ON DELETE CASCADE,
    injected_by UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    context_data JSONB NOT NULL,
    reason TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Analytics tables
CREATE TABLE IF NOT EXISTS usage_analytics (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,
    session_id UUID NOT NULL REFERENCES user_sessions(id) ON DELETE CASCADE,
    date DATE NOT NULL DEFAULT CURRENT_DATE,
    message_count INTEGER NOT NULL DEFAULT 0,
    total_tokens INTEGER NOT NULL DEFAULT 0,
    total_processing_time_ms INTEGER NOT NULL DEFAULT 0
);

-- Indexes for performance
CREATE INDEX IF NOT EXISTS idx_message_history_session_id ON message_history(session_id);
CREATE INDEX IF NOT EXISTS idx_message_history_created_at ON message_history(created_at);
CREATE INDEX IF NOT EXISTS idx_user_sessions_user_bot ON user_sessions(user_id, bot_id);
CREATE INDEX IF NOT EXISTS idx_usage_analytics_date ON usage_analytics(date);