-- Reverse of 057_profession_vs_responsibility.up.sql.
--
-- Best-effort rollback. The new columns are dropped; the legacy
-- project_teams.role column is re-derived from (responsibility, profession).
-- Down-migration loses information on edges:
--   * external responsibility → role='local_counsel' (loses expert distinction)
--   * member + profession=partner → role='of_counsel' (no legacy 'partner'
--     existed in project_teams.role; closest legacy ceiling)
--   * member + profession=paralegal → role='pa' (no legacy paralegal)
--   * member + profession=NULL → role='associate' (safe default, matches
--     the legacy RoleAssociate default)
-- These edges are documented; if the down is run on real production data,
-- review per-row before commit.

-- ============================================================================
-- 1. Restore approval_role_level to point at legacy ladder values.
-- ============================================================================

CREATE OR REPLACE FUNCTION paliad.approval_role_level(role text)
RETURNS int LANGUAGE SQL IMMUTABLE AS $$
    SELECT CASE role
        WHEN 'lead'       THEN 5
        WHEN 'of_counsel' THEN 4
        WHEN 'associate'  THEN 3
        WHEN 'senior_pa'  THEN 2
        WHEN 'pa'         THEN 1
        ELSE 0
    END
$$;

-- ============================================================================
-- 2. Restore approval_role_from_unit_role lead → lead.
-- ============================================================================

CREATE OR REPLACE FUNCTION paliad.approval_role_from_unit_role(unit_role text)
RETURNS text LANGUAGE SQL IMMUTABLE AS $$
    SELECT CASE unit_role
        WHEN 'lead'      THEN 'lead'
        WHEN 'attorney'  THEN 'associate'
        WHEN 'senior_pa' THEN 'senior_pa'
        WHEN 'pa'        THEN 'pa'
        ELSE                  'observer'
    END
$$;

-- ============================================================================
-- 3. Re-derive project_teams.role from (responsibility, profession).
-- ============================================================================

UPDATE paliad.project_teams pt
   SET role = CASE
       WHEN pt.responsibility = 'lead'     THEN 'lead'
       WHEN pt.responsibility = 'observer' THEN 'observer'
       WHEN pt.responsibility = 'external' THEN 'local_counsel'
       ELSE COALESCE(
           (SELECT CASE u.profession
                       WHEN 'partner'    THEN 'of_counsel'  -- best-effort: no legacy 'partner' role
                       WHEN 'of_counsel' THEN 'of_counsel'
                       WHEN 'associate'  THEN 'associate'
                       WHEN 'senior_pa'  THEN 'senior_pa'
                       WHEN 'pa'         THEN 'pa'
                       WHEN 'paralegal'  THEN 'pa'         -- closest legacy fit
                   END
              FROM paliad.users u WHERE u.id = pt.user_id),
           'associate'
       )
   END;

-- ============================================================================
-- 4. Restore approval_policies + approval_requests CHECK constraints.
-- ============================================================================

UPDATE paliad.approval_policies
   SET required_role = 'lead'
 WHERE required_role = 'partner';

ALTER TABLE paliad.approval_policies DROP CONSTRAINT IF EXISTS approval_policies_required_role_check;
ALTER TABLE paliad.approval_policies ADD CONSTRAINT approval_policies_required_role_check
    CHECK (required_role IN ('lead', 'of_counsel', 'associate', 'senior_pa', 'pa'));

UPDATE paliad.approval_requests
   SET required_role = 'lead'
 WHERE required_role = 'partner';

ALTER TABLE paliad.approval_requests DROP CONSTRAINT IF EXISTS approval_requests_required_role_check;
ALTER TABLE paliad.approval_requests ADD CONSTRAINT approval_requests_required_role_check
    CHECK (required_role IN ('lead', 'of_counsel', 'associate', 'senior_pa', 'pa'));

-- ============================================================================
-- 5. Restore project_partner_units RLS to read pt.role = 'lead'.
-- ============================================================================

DROP POLICY IF EXISTS project_partner_units_write ON paliad.project_partner_units;

CREATE POLICY project_partner_units_write
    ON paliad.project_partner_units FOR ALL
    USING (
      EXISTS (SELECT 1 FROM paliad.users u
               WHERE u.id = auth.uid() AND u.global_role = 'global_admin')
      OR EXISTS (SELECT 1 FROM paliad.project_teams pt
                  WHERE pt.user_id = auth.uid()
                    AND pt.project_id = project_partner_units.project_id
                    AND pt.role = 'lead')
    )
    WITH CHECK (
      EXISTS (SELECT 1 FROM paliad.users u
               WHERE u.id = auth.uid() AND u.global_role = 'global_admin')
      OR EXISTS (SELECT 1 FROM paliad.project_teams pt
                  WHERE pt.user_id = auth.uid()
                    AND pt.project_id = project_partner_units.project_id
                    AND pt.role = 'lead')
    );

-- ============================================================================
-- 6. Drop the new function and columns.
-- ============================================================================

DROP FUNCTION IF EXISTS paliad.user_project_authority_level(uuid, uuid);

DROP INDEX IF EXISTS paliad.project_teams_responsibility_idx;
ALTER TABLE paliad.project_teams DROP COLUMN IF EXISTS responsibility;

DROP INDEX IF EXISTS paliad.users_profession_idx;
ALTER TABLE paliad.users DROP COLUMN IF EXISTS profession;