-- ============================================================
-- 앵커링 이름 전면 개편 마이그레이션 (2026-07-06)
--   rate_adjustments → adjustments (+컬럼 6종)
--   sessions 앵커링 컬럼 4종, 뷰 2종(rate_history/current_rates → value_history/current_values)
-- 대상: 구 이름 스키마가 이미 적용된 기존 DB (신규 DB 는 postgres-init/01~05 적용으로 충분)
-- 멱등: 각 rename 은 구 이름 존재 시에만 수행 — 재실행·부분 적용 상태에서도 안전
-- 적용: psql -h <host> -U <user> -d negosium_db -f migrations/20260706_rename_anchoring.sql
-- ============================================================
\connect negosium_db

BEGIN;

-- 1) 구 이름 뷰 제거 (신 이름 뷰는 마지막에 재생성 — 정의는 postgres-init/05-anchoring-schema.sql 과 동일)
DROP VIEW IF EXISTS anchoring.rate_history;
DROP VIEW IF EXISTS anchoring.current_rates;

-- 2) 테이블·시퀀스·인덱스 rename
DO $$
BEGIN
    IF EXISTS (SELECT FROM information_schema.tables
               WHERE table_schema = 'anchoring' AND table_name = 'rate_adjustments') THEN
        ALTER TABLE anchoring.rate_adjustments RENAME TO adjustments;
    END IF;
    IF EXISTS (SELECT FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace
               WHERE n.nspname = 'anchoring' AND c.relname = 'rate_adjustments_id_seq') THEN
        ALTER SEQUENCE anchoring.rate_adjustments_id_seq RENAME TO adjustments_adjustment_id_seq;
    END IF;
    IF EXISTS (SELECT FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace
               WHERE n.nspname = 'anchoring' AND c.relname = 'idx_rate_adjustments_cell') THEN
        ALTER INDEX anchoring.idx_rate_adjustments_cell RENAME TO idx_adjustments_cell;
    END IF;
    -- 테이블 rename 은 PK 제약 이름을 바꾸지 않는다 — 함께 정리
    IF EXISTS (SELECT FROM pg_constraint con JOIN pg_namespace n ON n.oid = con.connamespace
               WHERE n.nspname = 'anchoring' AND con.conname = 'rate_adjustments_pkey') THEN
        ALTER TABLE anchoring.adjustments RENAME CONSTRAINT rate_adjustments_pkey TO adjustments_pkey;
    END IF;
END $$;

-- 3) adjustments 컬럼 rename
DO $$
DECLARE
    r RECORD;
BEGIN
    FOR r IN
        SELECT * FROM (VALUES
            ('id',                   'adjustment_id'),
            ('price_bracket_index',  'price_range_index'),
            ('nego_count',           'sample_count'),
            ('anchor_rate_before',   'anchoring_value_before'),
            ('anchor_rate_after',    'anchoring_value_after'),
            ('consumed_session_ids', 'used_session_ids')
        ) AS m(old_name, new_name)
    LOOP
        IF EXISTS (SELECT FROM information_schema.columns
                   WHERE table_schema = 'anchoring' AND table_name = 'adjustments'
                     AND column_name = r.old_name) THEN
            EXECUTE format('ALTER TABLE anchoring.adjustments RENAME COLUMN %I TO %I',
                           r.old_name, r.new_name);
        END IF;
    END LOOP;
END $$;

-- 4) negotiation.sessions 앵커링 컬럼 rename
--    (부분 인덱스 idx_sessions_anchoring_pending 술어는 컬럼 rename 을 자동 추종 — 재생성 불필요)
DO $$
DECLARE
    r RECORD;
BEGIN
    FOR r IN
        SELECT * FROM (VALUES
            ('target_anchoring_price', 'anchoring_price'),
            ('anchor_rate_permille',   'anchoring_value'),
            ('last_offered_price',     'last_offer_price'),
            ('anchoring_adjustment_id','used_by_adjustment_id')
        ) AS m(old_name, new_name)
    LOOP
        IF EXISTS (SELECT FROM information_schema.columns
                   WHERE table_schema = 'negotiation' AND table_name = 'sessions'
                     AND column_name = r.old_name) THEN
            EXECUTE format('ALTER TABLE negotiation.sessions RENAME COLUMN %I TO %I',
                           r.old_name, r.new_name);
        END IF;
    END LOOP;
END $$;

-- 5) 신 이름 뷰 재생성 (postgres-init/05-anchoring-schema.sql §조회용 뷰와 동일 정의)
CREATE OR REPLACE VIEW anchoring.value_history AS
SELECT adjustment_id,
       company_id,
       supplier_type,
       price_range_index,
       anchoring_value_before,
       anchoring_value_after,
       anchoring_value_after - anchoring_value_before    AS value_change,
       sample_count,
       success_count,
       round(success_count::numeric / sample_count, 3)  AS success_rate,
       created_at
FROM anchoring.adjustments;

CREATE OR REPLACE VIEW anchoring.current_values AS
SELECT DISTINCT ON (company_id, supplier_type, price_range_index)
       company_id,
       supplier_type,
       price_range_index,
       anchoring_value_after    AS anchoring_value,
       adjustment_id            AS last_adjustment_id,
       created_at               AS last_adjusted_at
FROM anchoring.adjustments
ORDER BY company_id, supplier_type, price_range_index, adjustment_id DESC;

COMMIT;