CREATE TABLE IF NOT EXISTS calls (
    id SERIAL PRIMARY KEY,
    account_id INTEGER NOT NULL,
    inbox_id INTEGER,
    conversation_id INTEGER NOT NULL,
    contact_id INTEGER,
    message_id INTEGER,
    accepted_by_agent_id INTEGER,
    provider VARCHAR(50) DEFAULT 'twilio',
    direction VARCHAR(50),
    provider_call_id VARCHAR(255),
    conference_sid VARCHAR(255),
    caller_type VARCHAR(100) NOT NULL DEFAULT '',
    caller_id INTEGER NOT NULL DEFAULT 0,
    status VARCHAR(50) NOT NULL DEFAULT 'ringing',
    duration INTEGER DEFAULT 0,
    call_direction VARCHAR(50) NOT NULL DEFAULT '',
    recording_url VARCHAR(512),
    additional_attributes JSONB DEFAULT '{}',
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_calls_deleted_at ON calls(deleted_at);
CREATE INDEX IF NOT EXISTS idx_calls_account_id ON calls(account_id);
CREATE INDEX IF NOT EXISTS idx_calls_inbox_id ON calls(inbox_id);
CREATE INDEX IF NOT EXISTS idx_calls_conversation_id ON calls(conversation_id);
CREATE INDEX IF NOT EXISTS idx_calls_contact_id ON calls(contact_id);
CREATE INDEX IF NOT EXISTS idx_calls_message_id ON calls(message_id);
CREATE INDEX IF NOT EXISTS idx_calls_accepted_by_agent_id ON calls(accepted_by_agent_id);
CREATE INDEX IF NOT EXISTS idx_calls_provider_call_id ON calls(provider, provider_call_id);

ALTER TABLE calls ADD COLUMN IF NOT EXISTS started_at TIMESTAMPTZ;
ALTER TABLE calls ADD COLUMN IF NOT EXISTS end_reason VARCHAR(255);