-- =====================================================
-- WhatsApp Nucleo - Database Schema
-- =====================================================

-- Extension for UUID generation
CREATE EXTENSION IF NOT EXISTS "pgcrypto";

-- =====================================================
-- INSTANCES: WhatsApp connection instances
-- =====================================================
CREATE TABLE instances (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL,
    phone_number VARCHAR(20),
    status VARCHAR(20) DEFAULT 'disconnected'
        CHECK (status IN ('disconnected', 'connecting', 'connected', 'qr_ready', 'pairing')),
    qr_code TEXT,
    pairing_code VARCHAR(10),
    last_connected_at TIMESTAMPTZ,
    created_by VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_phone UNIQUE (phone_number)
);

-- =====================================================
-- AUTH_KEYS: Baileys credentials per instance
-- =====================================================
CREATE TABLE auth_keys (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    instance_id UUID NOT NULL REFERENCES instances(id) ON DELETE CASCADE,
    key_type VARCHAR(50) NOT NULL,
    key_id VARCHAR(100),
    key_data JSONB NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_key UNIQUE (instance_id, key_type, key_id)
);

-- =====================================================
-- CONTACTS: WhatsApp contacts
-- =====================================================
CREATE TABLE contacts (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    instance_id UUID NOT NULL REFERENCES instances(id) ON DELETE CASCADE,
    jid VARCHAR(100) NOT NULL,
    name VARCHAR(255),
    push_name VARCHAR(255),
    phone_number VARCHAR(20),
    profile_picture_url TEXT,
    is_group BOOLEAN DEFAULT FALSE,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_contact UNIQUE (instance_id, jid)
);

-- =====================================================
-- CHATS: Conversations
-- =====================================================
CREATE TABLE chats (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    instance_id UUID NOT NULL REFERENCES instances(id) ON DELETE CASCADE,
    jid VARCHAR(100) NOT NULL,
    name VARCHAR(255),
    is_group BOOLEAN DEFAULT FALSE,
    is_archived BOOLEAN DEFAULT FALSE,
    is_pinned BOOLEAN DEFAULT FALSE,
    unread_count INTEGER DEFAULT 0,
    last_message_id UUID,
    last_message_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_chat UNIQUE (instance_id, jid)
);

-- =====================================================
-- MESSAGES: All messages
-- =====================================================
CREATE TABLE messages (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    instance_id UUID NOT NULL REFERENCES instances(id) ON DELETE CASCADE,
    chat_id UUID NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
    message_id VARCHAR(100) NOT NULL,
    from_jid VARCHAR(100) NOT NULL,
    to_jid VARCHAR(100),
    from_me BOOLEAN DEFAULT FALSE,
    message_type VARCHAR(50) NOT NULL,
    content TEXT,
    caption TEXT,
    media_url TEXT,
    media_mimetype VARCHAR(100),
    media_filename VARCHAR(255),
    quoted_message_id VARCHAR(100),
    timestamp TIMESTAMPTZ NOT NULL,
    status VARCHAR(20) DEFAULT 'sent'
        CHECK (status IN ('pending', 'sent', 'delivered', 'read', 'failed')),
    raw_message JSONB,
    created_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT unique_message UNIQUE (instance_id, message_id)
);

-- =====================================================
-- WEBHOOKS: Webhook configurations
-- =====================================================
CREATE TABLE webhooks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    instance_id UUID REFERENCES instances(id) ON DELETE CASCADE,
    name VARCHAR(100) NOT NULL,
    url TEXT NOT NULL,
    secret VARCHAR(255),
    events TEXT[] NOT NULL DEFAULT '{}',
    is_active BOOLEAN DEFAULT TRUE,
    headers JSONB DEFAULT '{}',
    retry_count INTEGER DEFAULT 3,
    timeout_ms INTEGER DEFAULT 5000,
    created_by VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

-- =====================================================
-- WEBHOOK_LOGS: Delivery logs
-- =====================================================
CREATE TABLE webhook_logs (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    webhook_id UUID NOT NULL REFERENCES webhooks(id) ON DELETE CASCADE,
    event_type VARCHAR(50) NOT NULL,
    payload JSONB NOT NULL,
    response_status INTEGER,
    response_body TEXT,
    error_message TEXT,
    attempt INTEGER DEFAULT 1,
    delivered_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- =====================================================
-- API_KEYS: External API access keys
-- =====================================================
CREATE TABLE api_keys (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL,
    key_hash VARCHAR(255) NOT NULL,
    key_prefix VARCHAR(10) NOT NULL,
    instance_id UUID REFERENCES instances(id) ON DELETE CASCADE,
    permissions TEXT[] NOT NULL DEFAULT '{}',
    is_active BOOLEAN DEFAULT TRUE,
    last_used_at TIMESTAMPTZ,
    expires_at TIMESTAMPTZ,
    created_by VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- =====================================================
-- INDEXES for performance
-- =====================================================
CREATE INDEX idx_auth_keys_instance ON auth_keys(instance_id);
CREATE INDEX idx_contacts_instance ON contacts(instance_id);
CREATE INDEX idx_chats_instance ON chats(instance_id);
CREATE INDEX idx_chats_last_message ON chats(instance_id, last_message_at DESC);
CREATE INDEX idx_messages_instance_chat ON messages(instance_id, chat_id);
CREATE INDEX idx_messages_timestamp ON messages(timestamp DESC);
CREATE INDEX idx_messages_chat_timestamp ON messages(chat_id, timestamp DESC);
CREATE INDEX idx_webhooks_instance ON webhooks(instance_id);
CREATE INDEX idx_webhooks_active ON webhooks(is_active) WHERE is_active = TRUE;
CREATE INDEX idx_webhook_logs_webhook ON webhook_logs(webhook_id, created_at DESC);
CREATE INDEX idx_api_keys_prefix ON api_keys(key_prefix) WHERE is_active = TRUE;

-- =====================================================
-- TRIGGERS for updated_at
-- =====================================================
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ language 'plpgsql';

CREATE TRIGGER update_instances_updated_at
    BEFORE UPDATE ON instances
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_auth_keys_updated_at
    BEFORE UPDATE ON auth_keys
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_contacts_updated_at
    BEFORE UPDATE ON contacts
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_chats_updated_at
    BEFORE UPDATE ON chats
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_webhooks_updated_at
    BEFORE UPDATE ON webhooks
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();