-- Chatwoot enterprise agent capacity policy links.

ALTER TABLE account_users ADD COLUMN IF NOT EXISTS agent_capacity_policy_id INTEGER;

CREATE INDEX IF NOT EXISTS idx_account_users_agent_capacity_policy_id
    ON account_users(agent_capacity_policy_id)
    WHERE deleted_at IS NULL;

CREATE TABLE IF NOT EXISTS agent_capacity_policies (
    id SERIAL PRIMARY KEY,
    account_id INTEGER NOT NULL,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    assignment_logic VARCHAR(50) DEFAULT 'round_robin',
    exclusion_rules JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_agent_capacity_policies_account_id
    ON agent_capacity_policies(account_id);

CREATE TABLE IF NOT EXISTS inbox_capacity_limits (
    id SERIAL PRIMARY KEY,
    agent_capacity_policy_id INTEGER NOT NULL,
    inbox_id INTEGER NOT NULL,
    conversation_limit INTEGER NOT NULL CHECK (conversation_limit >= 0),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    UNIQUE(agent_capacity_policy_id, inbox_id)
);

CREATE INDEX IF NOT EXISTS idx_inbox_capacity_limits_policy_id
    ON inbox_capacity_limits(agent_capacity_policy_id);

CREATE INDEX IF NOT EXISTS idx_inbox_capacity_limits_inbox_id
    ON inbox_capacity_limits(inbox_id);