-- ============================================
-- AI Configurations Table
-- Per-tenant AI settings and defaults
-- ============================================

CREATE TABLE ai.configs (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL REFERENCES tenants.tenants(id) ON DELETE CASCADE,

    -- Provider settings
    provider ai.ai_provider NOT NULL DEFAULT 'openrouter',
    default_model VARCHAR(100) NOT NULL DEFAULT 'anthropic/claude-3-haiku',
    fallback_model VARCHAR(100) DEFAULT 'openai/gpt-3.5-turbo',

    -- Generation parameters
    temperature NUMERIC(3,2) NOT NULL DEFAULT 0.7 CHECK (temperature >= 0 AND temperature <= 2),
    max_tokens INTEGER NOT NULL DEFAULT 2048 CHECK (max_tokens > 0 AND max_tokens <= 32000),
    top_p NUMERIC(3,2) DEFAULT 1.0 CHECK (top_p >= 0 AND top_p <= 1),
    frequency_penalty NUMERIC(3,2) DEFAULT 0.0 CHECK (frequency_penalty >= -2 AND frequency_penalty <= 2),
    presence_penalty NUMERIC(3,2) DEFAULT 0.0 CHECK (presence_penalty >= -2 AND presence_penalty <= 2),

    -- System prompt
    system_prompt TEXT,

    -- Rate limits (override plan defaults)
    rate_limit_requests_per_minute INTEGER,
    rate_limit_tokens_per_minute INTEGER,
    rate_limit_tokens_per_month INTEGER,

    -- Feature flags
    is_enabled BOOLEAN NOT NULL DEFAULT true,
    allow_custom_prompts BOOLEAN NOT NULL DEFAULT true,
    log_conversations BOOLEAN NOT NULL DEFAULT false,

    -- Additional settings as JSON
    settings JSONB DEFAULT '{}',

    -- Timestamps
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Ensure one config per tenant
    CONSTRAINT uq_ai_configs_tenant UNIQUE (tenant_id)
);

-- Indexes
CREATE INDEX idx_ai_configs_tenant ON ai.configs(tenant_id);
CREATE INDEX idx_ai_configs_provider ON ai.configs(provider);

-- RLS
ALTER TABLE ai.configs ENABLE ROW LEVEL SECURITY;

CREATE POLICY ai_configs_tenant_isolation ON ai.configs
    FOR ALL
    USING (tenant_id = current_setting('app.current_tenant_id', true)::UUID);

-- Trigger for updated_at
CREATE TRIGGER update_ai_configs_updated_at
    BEFORE UPDATE ON ai.configs
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();

-- Comments
COMMENT ON TABLE ai.configs IS 'AI configuration per tenant';
COMMENT ON COLUMN ai.configs.default_model IS 'Default model to use (e.g., anthropic/claude-3-haiku)';
COMMENT ON COLUMN ai.configs.system_prompt IS 'Default system prompt for all AI interactions';
COMMENT ON COLUMN ai.configs.settings IS 'Additional provider-specific settings as JSON';