-- Phase 5: Agent-Assisted Distillation and Suggestion
-- AgentProposal, AgentReviewRecord, ConfidenceAnnotation

CREATE TABLE agent_proposals (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    proposal_type TEXT NOT NULL,
    source_widget_id    UUID REFERENCES widgets(id) ON DELETE SET NULL,
    source_candidate_id UUID REFERENCES requirement_candidates(id) ON DELETE SET NULL,
    source_thread_id    UUID REFERENCES annotation_threads(id) ON DELETE SET NULL,
    source_decision_id  UUID REFERENCES decision_records(id) ON DELETE SET NULL,
    content   TEXT NOT NULL,
    model_ref TEXT NOT NULL,
    confidence NUMERIC CHECK (confidence BETWEEN 0 AND 1),
    status TEXT NOT NULL DEFAULT 'pending',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
);

CREATE INDEX agent_proposals_proposal_type_idx ON agent_proposals (proposal_type);
CREATE INDEX agent_proposals_status_idx ON agent_proposals (status);
CREATE INDEX agent_proposals_source_widget_id_idx ON agent_proposals (source_widget_id);
CREATE INDEX agent_proposals_created_at_idx ON agent_proposals (created_at DESC);

CREATE TABLE agent_review_records (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    proposal_id UUID NOT NULL REFERENCES agent_proposals(id) ON DELETE CASCADE,
    reviewer_id UUID REFERENCES users(id),
    decision TEXT NOT NULL,
    notes TEXT,
    reviewed_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
    UNIQUE (proposal_id)
);

CREATE INDEX agent_review_records_proposal_id_idx ON agent_review_records (proposal_id);

CREATE TABLE confidence_annotations (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    proposal_id UUID NOT NULL REFERENCES agent_proposals(id) ON DELETE CASCADE,
    dimension TEXT NOT NULL,
    score NUMERIC NOT NULL CHECK (score BETWEEN 0 AND 1),
    explanation TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
);

CREATE INDEX confidence_annotations_proposal_id_idx ON confidence_annotations (proposal_id);