-- Additive, rebuildable BLIF Flow v2 projection scaffolding.
-- This migration does not alter opportunities.stage or activate Flow v2.

CREATE TABLE IF NOT EXISTS opportunity_flow_state_v2 (
    opportunity_id UUID PRIMARY KEY REFERENCES opportunities(id) ON DELETE CASCADE,
    material_process_key TEXT NOT NULL,
    canonical_opportunity_id UUID NOT NULL REFERENCES opportunities(id) ON DELETE CASCADE,
    is_duplicate_representation BOOLEAN NOT NULL DEFAULT FALSE,
    business_state TEXT NOT NULL,
    business_next_action TEXT,
    diagnostic_status TEXT NOT NULL DEFAULT 'clear',
    confidence TEXT NOT NULL DEFAULT 'low',
    reason_code TEXT NOT NULL,
    reason_text TEXT NOT NULL,
    evidence_refs JSONB NOT NULL DEFAULT '[]'::jsonb,
    flow_version TEXT NOT NULL,
    source_fingerprint TEXT NOT NULL,
    derived_at TIMESTAMPTZ NOT NULL,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS ix_opportunity_flow_state_v2_material_process_key
    ON opportunity_flow_state_v2(material_process_key);
CREATE INDEX IF NOT EXISTS ix_opportunity_flow_state_v2_canonical
    ON opportunity_flow_state_v2(canonical_opportunity_id);
CREATE INDEX IF NOT EXISTS ix_opportunity_flow_state_v2_business_state
    ON opportunity_flow_state_v2(business_state);

ALTER TABLE tasks ADD COLUMN IF NOT EXISTS resolution_code TEXT;
ALTER TABLE tasks ADD COLUMN IF NOT EXISTS resolved_at TIMESTAMPTZ;
ALTER TABLE tasks ADD COLUMN IF NOT EXISTS resolved_by_event_id UUID REFERENCES opportunity_events(id) ON DELETE SET NULL;
ALTER TABLE tasks ADD COLUMN IF NOT EXISTS superseded_by_task_id UUID REFERENCES tasks(id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS ix_tasks_resolved_by_event_id ON tasks(resolved_by_event_id);
CREATE INDEX IF NOT EXISTS ix_tasks_superseded_by_task_id ON tasks(superseded_by_task_id);

CREATE TABLE IF NOT EXISTS opportunity_flow_transitions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    opportunity_id UUID NOT NULL REFERENCES opportunities(id) ON DELETE CASCADE,
    from_state TEXT,
    to_state TEXT NOT NULL,
    reason_code TEXT NOT NULL,
    reason_text TEXT NOT NULL,
    evidence_refs JSONB NOT NULL DEFAULT '[]'::jsonb,
    flow_version TEXT NOT NULL,
    source_fingerprint TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE (opportunity_id, from_state, to_state, flow_version, source_fingerprint)
);

CREATE INDEX IF NOT EXISTS ix_opportunity_flow_transitions_opportunity_created
    ON opportunity_flow_transitions(opportunity_id, created_at DESC);