-- Migration: Event System
-- Description: Creates tables for triggers, sensors, events, and enforcement
-- Version: 20250101000003


-- ============================================================================
-- TRIGGER TABLE
-- ============================================================================

CREATE TABLE trigger (
    id BIGSERIAL PRIMARY KEY,
    ref TEXT NOT NULL UNIQUE,
    pack BIGINT REFERENCES pack(id) ON DELETE CASCADE,
    pack_ref TEXT,
    label TEXT NOT NULL,
    description TEXT,
    enabled BOOLEAN NOT NULL DEFAULT TRUE,
    param_schema JSONB,
    out_schema JSONB,
    created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Constraints
    CONSTRAINT trigger_ref_lowercase CHECK (ref = LOWER(ref)),
    CONSTRAINT trigger_ref_format CHECK (ref ~ '^[^.]+\.[^.]+$')
);

-- Indexes
CREATE INDEX idx_trigger_ref ON trigger(ref);
CREATE INDEX idx_trigger_pack ON trigger(pack);
CREATE INDEX idx_trigger_enabled ON trigger(enabled) WHERE enabled = TRUE;
CREATE INDEX idx_trigger_created ON trigger(created DESC);
CREATE INDEX idx_trigger_pack_enabled ON trigger(pack, enabled);
CREATE INDEX idx_trigger_enabled_created ON trigger(enabled, created DESC) WHERE enabled = TRUE;

-- Trigger
CREATE TRIGGER update_trigger_updated
    BEFORE UPDATE ON trigger
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_column();

-- Permissions
GRANT SELECT, INSERT, UPDATE, DELETE ON trigger TO svc_attune;
GRANT USAGE, SELECT ON SEQUENCE trigger_id_seq TO svc_attune;

-- Comments
COMMENT ON TABLE trigger IS 'Trigger definitions that can activate rules';
COMMENT ON COLUMN trigger.ref IS 'Unique trigger reference (format: pack.name)';
COMMENT ON COLUMN trigger.label IS 'Human-readable trigger name';
COMMENT ON COLUMN trigger.enabled IS 'Whether this trigger is active';
COMMENT ON COLUMN trigger.param_schema IS 'JSON schema defining the expected configuration parameters when this trigger is used';
COMMENT ON COLUMN trigger.out_schema IS 'JSON schema defining the structure of event payloads generated by this trigger';

-- ============================================================================
-- SENSOR TABLE
-- ============================================================================

CREATE TABLE sensor (
    id BIGSERIAL PRIMARY KEY,
    ref TEXT NOT NULL UNIQUE,
    pack BIGINT REFERENCES pack(id) ON DELETE CASCADE,
    pack_ref TEXT,
    label TEXT NOT NULL,
    description TEXT NOT NULL,
    entrypoint TEXT NOT NULL,
    runtime BIGINT NOT NULL REFERENCES runtime(id) ON DELETE CASCADE,
    runtime_ref TEXT NOT NULL,
    trigger BIGINT NOT NULL REFERENCES trigger(id) ON DELETE CASCADE,
    trigger_ref TEXT NOT NULL,
    enabled BOOLEAN NOT NULL,
    param_schema JSONB,
    config JSONB,
    created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Constraints
    CONSTRAINT sensor_ref_lowercase CHECK (ref = LOWER(ref)),
    CONSTRAINT sensor_ref_format CHECK (ref ~ '^[^.]+\.[^.]+$')
);

-- Indexes
CREATE INDEX idx_sensor_ref ON sensor(ref);
CREATE INDEX idx_sensor_pack ON sensor(pack);
CREATE INDEX idx_sensor_runtime ON sensor(runtime);
CREATE INDEX idx_sensor_trigger ON sensor(trigger);
CREATE INDEX idx_sensor_enabled ON sensor(enabled) WHERE enabled = TRUE;
CREATE INDEX idx_sensor_created ON sensor(created DESC);
CREATE INDEX idx_sensor_trigger_enabled ON sensor(trigger, enabled);
CREATE INDEX idx_sensor_pack_enabled ON sensor(pack, enabled);
CREATE INDEX idx_sensor_runtime_enabled ON sensor(runtime, enabled);
CREATE INDEX idx_sensor_config ON sensor USING GIN (config);

-- Trigger
CREATE TRIGGER update_sensor_updated
    BEFORE UPDATE ON sensor
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_column();

-- Permissions
GRANT SELECT, INSERT, UPDATE, DELETE ON sensor TO svc_attune;
GRANT USAGE, SELECT ON SEQUENCE sensor_id_seq TO svc_attune;

-- Comments
COMMENT ON TABLE sensor IS 'Sensors monitor for trigger conditions and generate events';
COMMENT ON COLUMN sensor.ref IS 'Unique sensor reference (format: pack.name)';
COMMENT ON COLUMN sensor.entrypoint IS 'Code entry point for the sensor';
COMMENT ON COLUMN sensor.runtime IS 'Execution environment for the sensor';
COMMENT ON COLUMN sensor.trigger IS 'Trigger that this sensor monitors for';
COMMENT ON COLUMN sensor.enabled IS 'Whether this sensor is active';
COMMENT ON COLUMN sensor.param_schema IS 'JSON schema describing expected configuration (optional, usually inherited from trigger)';
COMMENT ON COLUMN sensor.config IS 'Actual configuration values for this sensor instance (conforms to trigger param_schema)';

-- Add foreign key constraint to key table for sensor ownership
ALTER TABLE key
    ADD CONSTRAINT key_owner_sensor_fkey
    FOREIGN KEY (owner_sensor) REFERENCES sensor(id) ON DELETE CASCADE;

-- ============================================================================
-- EVENT TABLE
-- ============================================================================

CREATE TABLE event (
    id BIGSERIAL PRIMARY KEY,
    trigger BIGINT REFERENCES trigger(id) ON DELETE SET NULL,
    trigger_ref TEXT NOT NULL,
    config JSONB,
    payload JSONB,
    source BIGINT REFERENCES sensor(id),
    source_ref TEXT,
    created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Indexes
CREATE INDEX idx_event_trigger ON event(trigger);
CREATE INDEX idx_event_trigger_ref ON event(trigger_ref);
CREATE INDEX idx_event_source ON event(source);
CREATE INDEX idx_event_created ON event(created DESC);
CREATE INDEX idx_event_trigger_created ON event(trigger, created DESC);
CREATE INDEX idx_event_trigger_ref_created ON event(trigger_ref, created DESC);
CREATE INDEX idx_event_source_created ON event(source, created DESC);
CREATE INDEX idx_event_payload_gin ON event USING GIN (payload);

-- Trigger
CREATE TRIGGER update_event_updated
    BEFORE UPDATE ON event
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_column();

-- Permissions
GRANT SELECT, INSERT, UPDATE, DELETE ON event TO svc_attune;
GRANT USAGE, SELECT ON SEQUENCE event_id_seq TO svc_attune;

-- Comments
COMMENT ON TABLE event IS 'Events are instances of triggers firing';
COMMENT ON COLUMN event.trigger IS 'Trigger that fired (may be null if trigger deleted)';
COMMENT ON COLUMN event.trigger_ref IS 'Trigger reference (preserved even if trigger deleted)';
COMMENT ON COLUMN event.config IS 'Snapshot of trigger/sensor configuration at event time';
COMMENT ON COLUMN event.payload IS 'Event data payload';
COMMENT ON COLUMN event.source IS 'Sensor that generated this event';

-- ============================================================================
-- ENFORCEMENT TABLE
-- ============================================================================

CREATE TABLE enforcement (
    id BIGSERIAL PRIMARY KEY,
    rule BIGINT, -- Forward reference to rule table, will add constraint in next migration
    rule_ref TEXT NOT NULL,
    trigger_ref TEXT NOT NULL,
    config JSONB,
    event BIGINT REFERENCES event(id) ON DELETE SET NULL,
    status enforcement_status_enum NOT NULL DEFAULT 'created',
    payload JSONB NOT NULL,
    condition enforcement_condition_enum NOT NULL DEFAULT 'all',
    conditions JSONB NOT NULL DEFAULT '[]'::jsonb,
    created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Constraints
    CONSTRAINT enforcement_condition_check CHECK (condition IN ('any', 'all'))
);

-- Indexes
CREATE INDEX idx_enforcement_rule ON enforcement(rule);
CREATE INDEX idx_enforcement_rule_ref ON enforcement(rule_ref);
CREATE INDEX idx_enforcement_trigger_ref ON enforcement(trigger_ref);
CREATE INDEX idx_enforcement_event ON enforcement(event);
CREATE INDEX idx_enforcement_status ON enforcement(status);
CREATE INDEX idx_enforcement_created ON enforcement(created DESC);
CREATE INDEX idx_enforcement_status_created ON enforcement(status, created DESC);
CREATE INDEX idx_enforcement_rule_status ON enforcement(rule, status);
CREATE INDEX idx_enforcement_event_status ON enforcement(event, status);
CREATE INDEX idx_enforcement_payload_gin ON enforcement USING GIN (payload);
CREATE INDEX idx_enforcement_conditions_gin ON enforcement USING GIN (conditions);

-- Trigger
CREATE TRIGGER update_enforcement_updated
    BEFORE UPDATE ON enforcement
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_column();

-- Permissions
GRANT SELECT, INSERT, UPDATE, DELETE ON enforcement TO svc_attune;
GRANT USAGE, SELECT ON SEQUENCE enforcement_id_seq TO svc_attune;

-- Comments
COMMENT ON TABLE enforcement IS 'Enforcements represent rule triggering by events';
COMMENT ON COLUMN enforcement.rule IS 'Rule being enforced (may be null if rule deleted)';
COMMENT ON COLUMN enforcement.rule_ref IS 'Rule reference (preserved even if rule deleted)';
COMMENT ON COLUMN enforcement.event IS 'Event that triggered this enforcement';
COMMENT ON COLUMN enforcement.status IS 'Processing status';
COMMENT ON COLUMN enforcement.payload IS 'Event payload for rule evaluation';
COMMENT ON COLUMN enforcement.condition IS 'Logical operator for conditions (any=OR, all=AND)';
COMMENT ON COLUMN enforcement.conditions IS 'Condition expressions to evaluate';