-- Migration 106: Explicit image/details research resolution state
--
-- image_verified/details_verified stay strict: true only when source-backed
-- evidence exists. These status columns let TIP close research loops when a
-- public source does not expose an image or enough details, without inventing
-- data or abusing verified booleans.

ALTER TABLE transceivers
  ADD COLUMN IF NOT EXISTS image_status VARCHAR(32) NOT NULL DEFAULT 'unknown',
  ADD COLUMN IF NOT EXISTS image_status_updated_at TIMESTAMPTZ,
  ADD COLUMN IF NOT EXISTS image_unavailable_verified_at TIMESTAMPTZ,
  ADD COLUMN IF NOT EXISTS image_unavailable_reason TEXT,
  ADD COLUMN IF NOT EXISTS details_status VARCHAR(32) NOT NULL DEFAULT 'unknown',
  ADD COLUMN IF NOT EXISTS details_status_updated_at TIMESTAMPTZ,
  ADD COLUMN IF NOT EXISTS details_unavailable_verified_at TIMESTAMPTZ,
  ADD COLUMN IF NOT EXISTS details_unavailable_reason TEXT;

DO $$
BEGIN
  IF EXISTS (
    SELECT 1 FROM pg_constraint
    WHERE conname = 'transceivers_image_status_check'
  ) THEN
    ALTER TABLE transceivers DROP CONSTRAINT transceivers_image_status_check;
  END IF;

  ALTER TABLE transceivers
    ADD CONSTRAINT transceivers_image_status_check
    CHECK (image_status IN (
      'unknown',
      'public_image',
      'no_public_image',
      'needs_research',
      'ambiguous'
    ));

  IF EXISTS (
    SELECT 1 FROM pg_constraint
    WHERE conname = 'transceivers_details_status_check'
  ) THEN
    ALTER TABLE transceivers DROP CONSTRAINT transceivers_details_status_check;
  END IF;

  ALTER TABLE transceivers
    ADD CONSTRAINT transceivers_details_status_check
    CHECK (details_status IN (
      'unknown',
      'public_details',
      'no_public_details',
      'needs_research',
      'ambiguous'
    ));
END $$;

UPDATE transceivers
SET image_status = CASE
      WHEN image_verified = true THEN 'public_image'
      WHEN image_status = 'unknown' THEN 'needs_research'
      ELSE image_status
    END,
    image_status_updated_at = COALESCE(image_status_updated_at, NOW())
WHERE image_status IS NULL
   OR image_status = 'unknown'
   OR image_verified = true;

UPDATE transceivers
SET details_status = CASE
      WHEN details_verified = true THEN 'public_details'
      WHEN details_status = 'unknown' THEN 'needs_research'
      ELSE details_status
    END,
    details_status_updated_at = COALESCE(details_status_updated_at, NOW())
WHERE details_status IS NULL
   OR details_status = 'unknown'
   OR details_verified = true;

CREATE INDEX IF NOT EXISTS idx_transceivers_image_status
  ON transceivers (image_status);

CREATE INDEX IF NOT EXISTS idx_transceivers_details_status
  ON transceivers (details_status);

ALTER TABLE transceiver_verification_evidence
  DROP CONSTRAINT IF EXISTS transceiver_verification_evidence_verification_type_check;

ALTER TABLE transceiver_verification_evidence
  ADD CONSTRAINT transceiver_verification_evidence_verification_type_check
  CHECK (
    verification_type::text = ANY (
      ARRAY[
        'price',
        'price_unavailable',
        'image',
        'image_unavailable',
        'details',
        'details_unavailable',
        'competitor_match',
        'competitor_no_match',
        'competitor_ambiguous',
        'artifact_quarantine'
      ]
    )
  );

COMMENT ON COLUMN transceivers.image_status IS
  'Resolution state for image evidence: public_image, no_public_image, needs_research, ambiguous, unknown. image_verified remains true only for source-backed product images.';

COMMENT ON COLUMN transceivers.details_status IS
  'Resolution state for detail evidence: public_details, no_public_details, needs_research, ambiguous, unknown. details_verified remains true only for source-backed product details.';