-- =====================================================================
-- project_db 초기화 스크립트 (PostgreSQL) — 프로젝트 관리(아사나식) 모듈
-- =====================================================================
-- 멱등(idempotent): 여러 번 실행해도 안전. 기존 데이터를 삭제하지 않는다.
--
-- ⚠️ 실행 전 사용자 승인 + 백업 확인 필수. DROP/TRUNCATE 없음.
--
-- 실행 방법 (운영 PostgreSQL 컨테이너명: postgres-db):
--
--   1) DB / 역할 / 스키마 생성 (superuser 로 1회)
--      read -s -p "project_app password: " APP_PWD; echo
--      docker exec -i postgres-db psql -U postgres \
--          -v app_password="$APP_PWD" \
--          < scripts/sql/project_db_init.sql
--
--   2) main-app .env 에 연결 정보 등록
--      PROJECT_DB_URL=postgresql://project_app:<APP_PWD>@postgres-db:5432/project_db
--
--   3) main-app 재기동
--      cd /opt/www/main && docker compose up -d --build
--
-- 주의:
--   - 기존 DB 가 있으면 DROP 하지 않는다(CREATE DATABASE 는 미존재 시에만).
--   - 비밀번호는 절대 Git 에 커밋하지 않는다. psql -v 로만 전달.
-- =====================================================================

\set ON_ERROR_STOP on

-- DB 가 없을 때만 생성
SELECT 'CREATE DATABASE project_db ENCODING ''UTF8'' TEMPLATE template0'
WHERE NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = 'project_db')
\gexec

-- 앱 전용 로그인 역할 (vacation_app / cupang_app 패턴과 동일)
SELECT 'CREATE ROLE project_app LOGIN PASSWORD ' || quote_literal(:'app_password')
WHERE NOT EXISTS (SELECT 1 FROM pg_roles WHERE rolname = 'project_app')
\gexec

-- 항상 최신 비밀번호로 동기화
SELECT 'ALTER ROLE project_app WITH LOGIN PASSWORD ' || quote_literal(:'app_password')
\gexec

GRANT CONNECT ON DATABASE project_db TO project_app;

-- project_db 컨텍스트로 전환
\connect project_db

-- ── updated_at 자동 갱신 트리거 함수 (멱등: CREATE OR REPLACE) ──
CREATE OR REPLACE FUNCTION project_set_updated_at() RETURNS trigger AS $$
BEGIN
  NEW.updated_at := now();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- ════════════════════════════════════════════════════════════
-- 1) 프로젝트 / 서브프로젝트 (self-referential: parent_id)
--    parent_id NULL = 최상위 프로젝트, NOT NULL = 서브프로젝트.
--    삭제는 CASCADE (서브프로젝트·단계·업무 모두 함께 제거).
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS projects (
    id           BIGSERIAL    PRIMARY KEY,
    parent_id    BIGINT       REFERENCES projects(id) ON DELETE CASCADE,
    name         TEXT         NOT NULL,
    description  TEXT         NOT NULL DEFAULT '',
    color        TEXT         NOT NULL DEFAULT '#4573d2',
    owner_email  TEXT         NOT NULL DEFAULT '',
    start_date   DATE,
    due_date     DATE,
    status       TEXT         NOT NULL DEFAULT 'active',  -- active | archived
    sort_order   INTEGER      NOT NULL DEFAULT 0,
    created_by   TEXT         NOT NULL DEFAULT '',
    created_at   TIMESTAMPTZ  NOT NULL DEFAULT now(),
    updated_at   TIMESTAMPTZ  NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_projects_parent ON projects (parent_id);
CREATE INDEX IF NOT EXISTS idx_projects_status ON projects (status);

DROP TRIGGER IF EXISTS trg_projects_updated ON projects;
CREATE TRIGGER trg_projects_updated
  BEFORE UPDATE ON projects
  FOR EACH ROW EXECUTE FUNCTION project_set_updated_at();

-- ════════════════════════════════════════════════════════════
-- 2) 프로젝트 멤버 배정 (관리자가 사용자를 프로젝트에 지정)
--    role: manager(서브프로젝트/업무 관리) | member
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS project_members (
    id           BIGSERIAL    PRIMARY KEY,
    project_id   BIGINT       NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    user_email   TEXT         NOT NULL,
    user_name    TEXT         NOT NULL DEFAULT '',
    role         TEXT         NOT NULL DEFAULT 'member',  -- manager | member
    created_at   TIMESTAMPTZ  NOT NULL DEFAULT now(),
    UNIQUE (project_id, user_email)
);
CREATE INDEX IF NOT EXISTS idx_project_members_project ON project_members (project_id);
CREATE INDEX IF NOT EXISTS idx_project_members_email   ON project_members (user_email);

-- ════════════════════════════════════════════════════════════
-- 3) 진행 단계 (칸반 컬럼) — 프로젝트별. 생성 시 기본 4단계 seed.
--    is_done_stage: 이 단계로 옮기면 업무 '완료'로 간주(메일 트리거).
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS project_stages (
    id            BIGSERIAL    PRIMARY KEY,
    project_id    BIGINT       NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    name          TEXT         NOT NULL,
    sort_order    INTEGER      NOT NULL DEFAULT 0,
    is_done_stage BOOLEAN      NOT NULL DEFAULT FALSE,
    created_at    TIMESTAMPTZ  NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_project_stages_project ON project_stages (project_id, sort_order);

-- ════════════════════════════════════════════════════════════
-- 4) 업무 (task)
--    stage_id 로 진행단계 표현. assignee_email 로 담당자 지정.
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS tasks (
    id             BIGSERIAL    PRIMARY KEY,
    project_id     BIGINT       NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    stage_id       BIGINT       REFERENCES project_stages(id) ON DELETE SET NULL,
    title          TEXT         NOT NULL,
    description    TEXT         NOT NULL DEFAULT '',
    assignee_email TEXT         NOT NULL DEFAULT '',
    assignee_name  TEXT         NOT NULL DEFAULT '',
    priority       TEXT         NOT NULL DEFAULT 'normal',  -- low | normal | high
    start_date     DATE,
    due_date       DATE,
    completed_at   TIMESTAMPTZ,
    sort_order     INTEGER      NOT NULL DEFAULT 0,
    created_by     TEXT         NOT NULL DEFAULT '',
    created_at     TIMESTAMPTZ  NOT NULL DEFAULT now(),
    updated_at     TIMESTAMPTZ  NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_tasks_project  ON tasks (project_id, sort_order);
CREATE INDEX IF NOT EXISTS idx_tasks_stage    ON tasks (stage_id);
CREATE INDEX IF NOT EXISTS idx_tasks_assignee ON tasks (assignee_email);
CREATE INDEX IF NOT EXISTS idx_tasks_due      ON tasks (due_date);

DROP TRIGGER IF EXISTS trg_tasks_updated ON tasks;
CREATE TRIGGER trg_tasks_updated
  BEFORE UPDATE ON tasks
  FOR EACH ROW EXECUTE FUNCTION project_set_updated_at();

-- ════════════════════════════════════════════════════════════
-- 5) 업무 댓글 (아사나 기본기능 — 스켈레톤 단계 테이블)
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS task_comments (
    id           BIGSERIAL    PRIMARY KEY,
    task_id      BIGINT       NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,
    author_email TEXT         NOT NULL DEFAULT '',
    author_name  TEXT         NOT NULL DEFAULT '',
    body         TEXT         NOT NULL DEFAULT '',
    created_at   TIMESTAMPTZ  NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_task_comments_task ON task_comments (task_id, created_at);

-- ════════════════════════════════════════════════════════════
-- 6) 활동 이력 (배정/완료 등 — 메일 알림 근거 + 타임라인)
-- ════════════════════════════════════════════════════════════
CREATE TABLE IF NOT EXISTS project_activity (
    id           BIGSERIAL    PRIMARY KEY,
    project_id   BIGINT       REFERENCES projects(id) ON DELETE CASCADE,
    task_id      BIGINT       REFERENCES tasks(id) ON DELETE CASCADE,
    actor_email  TEXT         NOT NULL DEFAULT '',
    action       TEXT         NOT NULL,   -- assigned | completed | created | stage_changed ...
    detail       TEXT         NOT NULL DEFAULT '',
    created_at   TIMESTAMPTZ  NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS idx_project_activity_project ON project_activity (project_id, created_at DESC);

-- ════════════════════════════════════════════════════════════
-- 7) 권한 (project_app: CRUD only)
-- ════════════════════════════════════════════════════════════
GRANT USAGE ON SCHEMA public TO project_app;
GRANT SELECT, INSERT, UPDATE, DELETE ON
  projects, project_members, project_stages, tasks, task_comments, project_activity
  TO project_app;
GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO project_app;
ALTER DEFAULT PRIVILEGES IN SCHEMA public
  GRANT SELECT, INSERT, UPDATE, DELETE ON TABLES TO project_app;
ALTER DEFAULT PRIVILEGES IN SCHEMA public
  GRANT USAGE, SELECT ON SEQUENCES TO project_app;

SELECT 'project_db ready' AS status;