-- 3. project：项目、基本信息字段、分包、项目成员（FR-M2-03、04，FR-M6-01、02）
-- 来源：docs/architecture/schema-draft.sql（2026-11-03 验证过的草案）
CREATE TABLE project (
  id                      uuid PRIMARY KEY,
  tenant_id               uuid NOT NULL REFERENCES tenant (id),
  -- 下面几列是 project_field 的当前值，冗余在这里给工作台列表排序和筛选用
  name                    text NOT NULL,
  code                    text,
  purchaser               text,
  agency                  text,
  procurement_method      text,
  legal_regime            text NOT NULL DEFAULT 'unknown'
                          CHECK (legal_regime IN ('gov_procurement', 'tendering', 'unknown')),
  deadline_at             timestamptz,
  status                  text NOT NULL DEFAULT 'tracking'
                          CHECK (status IN ('tracking', 'drafting', 'checked', 'submitted', 'archived')),
  status_before_archive   text CHECK (status_before_archive IN ('checked', 'submitted')),
  -- 就绪标记：只在 checked 状态显示（G7）；由 check 模块在处理问题的同一个事务里更新
  latest_check_run_id     uuid,
  open_fatal_count        int NOT NULL DEFAULT 0,
  last_charged_check_at   timestamptz,                  -- 24 小时免扣的起点（P1）
  created_by              uuid NOT NULL REFERENCES user_account (id),
  created_at              timestamptz NOT NULL DEFAULT now(),
  updated_at              timestamptz NOT NULL DEFAULT now(),
  UNIQUE (tenant_id, id)
);
CREATE INDEX ON project (tenant_id, status, deadline_at);

CREATE TABLE project_member (                           -- AR12：MVP 只有建项目的人，角色 lead
  tenant_id     uuid NOT NULL,
  project_id    uuid NOT NULL,
  user_id       uuid NOT NULL REFERENCES user_account (id),
  role          text NOT NULL CHECK (role IN ('lead', 'editor', 'viewer')),
  added_by      uuid NOT NULL REFERENCES user_account (id),
  created_at    timestamptz NOT NULL DEFAULT now(),
  PRIMARY KEY (tenant_id, project_id, user_id),
  FOREIGN KEY (tenant_id, project_id) REFERENCES project (tenant_id, id) ON DELETE CASCADE
);
CREATE INDEX ON project_member (tenant_id, user_id);

CREATE TABLE lot (                                      -- 包 / 标段；没分包时只有一个默认包
  id              uuid PRIMARY KEY,
  tenant_id       uuid NOT NULL,
  project_id      uuid NOT NULL,
  lot_no          text NOT NULL,                        -- 原文里的写法：「1」「包2」「第三标段」
  name            text,
  budget_amount   numeric(18, 2),
  ceiling_amount  numeric(18, 2),                       -- 采购包限价；三层限价的另外两层见 data-model §5.3
  is_default      boolean NOT NULL DEFAULT false,
  is_bidding      boolean NOT NULL DEFAULT true,        -- 用户选择投哪些包
  origin          text NOT NULL CHECK (origin IN ('ai', 'human')),
  ai_values       jsonb,                                -- AI 原值，人工修改不覆盖
  edited_fields   text[] NOT NULL DEFAULT '{}',
  sort_order      int NOT NULL DEFAULT 0,
  created_at      timestamptz NOT NULL DEFAULT now(),
  updated_at      timestamptz NOT NULL DEFAULT now(),
  UNIQUE (tenant_id, id),
  UNIQUE (tenant_id, project_id, lot_no),
  FOREIGN KEY (tenant_id, project_id) REFERENCES project (tenant_id, id) ON DELETE CASCADE
);