-- o2o-site-ontology : initial schema
-- pgvector(유사도) + ltree(업종/지역 계층) + pg_trgm(표기 변형) 3-in-1

CREATE EXTENSION IF NOT EXISTS vector;
CREATE EXTENSION IF NOT EXISTS ltree;
CREATE EXTENSION IF NOT EXISTS pg_trgm;

-- ---------------------------------------------------------------- 분류 계층
CREATE TABLE IF NOT EXISTS industry (
  id          text PRIMARY KEY,
  path        ltree NOT NULL UNIQUE,
  name        text  NOT NULL,
  created_at  timestamptz NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS industry_path_gist ON industry USING gist (path);

CREATE TABLE IF NOT EXISTS region (
  id          text PRIMARY KEY,
  path        ltree NOT NULL UNIQUE,
  name        text  NOT NULL,
  created_at  timestamptz NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS region_path_gist ON region USING gist (path);

-- ---------------------------------------------------------------- 업체
CREATE TABLE IF NOT EXISTS merchant (
  id                uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  external_id       text NOT NULL UNIQUE,          -- o2o-site-AEO 의 사이트/업체 ID
  name              text NOT NULL,
  industry_id       text REFERENCES industry(id),
  region_id         text REFERENCES region(id),
  description       text NOT NULL DEFAULT '',
  profile           jsonb NOT NULL DEFAULT '{}'::jsonb,
  site_url          text,
  last_generated_at timestamptz,
  created_at        timestamptz NOT NULL DEFAULT now(),
  updated_at        timestamptz NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS merchant_industry_idx ON merchant (industry_id);
CREATE INDEX IF NOT EXISTS merchant_stale_idx    ON merchant (last_generated_at NULLS FIRST);

-- ---------------------------------------------------------------- 전역 키워드 사전
DO $$ BEGIN
  CREATE TYPE keyword_intent AS ENUM
    ('informational','navigational','transactional','local','brand');
EXCEPTION WHEN duplicate_object THEN NULL; END $$;

CREATE TABLE IF NOT EXISTS keyword (
  id           uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  canonical    text NOT NULL,                       -- 화면 노출용 대표 표기
  normalized   text NOT NULL,                       -- 중복 판정용 정규화 표기
  locale       text NOT NULL DEFAULT 'ko-KR',
  aliases      text[] NOT NULL DEFAULT '{}',        -- 흡수된 표기 변형 (롱테일 확보)
  intent       keyword_intent NOT NULL DEFAULT 'informational',
  industry_id  text REFERENCES industry(id),
  region_id    text REFERENCES region(id),
  embedding    vector(1536),
  usage_count  integer NOT NULL DEFAULT 0,          -- 몇 개 업체가 쓰는가
  created_at   timestamptz NOT NULL DEFAULT now(),
  updated_at   timestamptz NOT NULL DEFAULT now(),
  CONSTRAINT keyword_normalized_locale_uq UNIQUE (normalized, locale)
);
CREATE INDEX IF NOT EXISTS keyword_embedding_hnsw
  ON keyword USING hnsw (embedding vector_cosine_ops);
CREATE INDEX IF NOT EXISTS keyword_normalized_trgm
  ON keyword USING gin (normalized gin_trgm_ops);
CREATE INDEX IF NOT EXISTS keyword_industry_idx ON keyword (industry_id);

-- ---------------------------------------------------------------- 업체 <-> 키워드
DO $$ BEGIN
  CREATE TYPE merchant_keyword_status AS ENUM
    ('candidate','active','demoted','blocked');
EXCEPTION WHEN duplicate_object THEN NULL; END $$;

CREATE TABLE IF NOT EXISTS merchant_keyword (
  merchant_id  uuid NOT NULL REFERENCES merchant(id) ON DELETE CASCADE,
  keyword_id   uuid NOT NULL REFERENCES keyword(id)  ON DELETE CASCADE,
  relevance    real NOT NULL DEFAULT 0,
  source       text NOT NULL DEFAULT 'llm',          -- llm | manual | inherited
  status       merchant_keyword_status NOT NULL DEFAULT 'candidate',
  rationale    text,
  impressions  bigint NOT NULL DEFAULT 0,
  clicks       bigint NOT NULL DEFAULT 0,
  ctr          real   NOT NULL DEFAULT 0,
  created_at   timestamptz NOT NULL DEFAULT now(),
  updated_at   timestamptz NOT NULL DEFAULT now(),
  PRIMARY KEY (merchant_id, keyword_id)
);
CREATE INDEX IF NOT EXISTS merchant_keyword_serving_idx
  ON merchant_keyword (merchant_id, status, relevance DESC);

-- ---------------------------------------------------------------- AEO 질문-답변
CREATE TABLE IF NOT EXISTS qa_pair (
  id                  uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  merchant_id         uuid NOT NULL REFERENCES merchant(id) ON DELETE CASCADE,
  question            text NOT NULL,
  answer              text NOT NULL,
  normalized_question text NOT NULL,
  embedding           vector(1536),
  status              merchant_keyword_status NOT NULL DEFAULT 'active',
  created_at          timestamptz NOT NULL DEFAULT now(),
  updated_at          timestamptz NOT NULL DEFAULT now(),
  CONSTRAINT qa_pair_merchant_question_uq UNIQUE (merchant_id, normalized_question)
);
CREATE INDEX IF NOT EXISTS qa_pair_merchant_idx ON qa_pair (merchant_id, status);

-- ---------------------------------------------------------------- 생성 감사 로그
CREATE TABLE IF NOT EXISTS generation_run (
  id             uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  merchant_id    uuid REFERENCES merchant(id) ON DELETE CASCADE,
  provider       text NOT NULL,
  model          text NOT NULL,
  prompt_version text NOT NULL,
  trigger        text NOT NULL,                     -- published | scheduled | manual
  status         text NOT NULL DEFAULT 'running',   -- running | succeeded | failed
  input          jsonb NOT NULL DEFAULT '{}'::jsonb,
  output         jsonb NOT NULL DEFAULT '{}'::jsonb,
  stats          jsonb NOT NULL DEFAULT '{}'::jsonb,
  error          text,
  started_at     timestamptz NOT NULL DEFAULT now(),
  finished_at    timestamptz
);
CREATE INDEX IF NOT EXISTS generation_run_merchant_idx
  ON generation_run (merchant_id, started_at DESC);