-- 许可管理单位权限优化 - 数据库迁移脚本
-- 版本: 1.0
-- 日期: 2025-11-19

BEGIN;

-- 1. 为service_departments表添加unit_level字段
ALTER TABLE service_departments
ADD COLUMN IF NOT EXISTS unit_level VARCHAR(20) DEFAULT 'unit'
CHECK (unit_level IN ('admin', 'municipal', 'district', 'unit'));

-- 2. 为service_departments表添加allowed_regions字段（市级单位可访问的行政区）
ALTER TABLE service_departments
ADD COLUMN IF NOT EXISTS allowed_regions TEXT;

-- 3. 为permit_sources表添加uploader_department_id字段
ALTER TABLE permit_sources
ADD COLUMN IF NOT EXISTS uploader_department_id uuid REFERENCES service_departments(id);

-- 4. 为permit_sources表添加bound_department_id字段
ALTER TABLE permit_sources
ADD COLUMN IF NOT EXISTS bound_department_id uuid REFERENCES service_departments(id);

-- 5. 创建索引以提高查询性能
CREATE INDEX IF NOT EXISTS idx_service_dept_unit_level
ON service_departments(unit_level);

CREATE INDEX IF NOT EXISTS idx_service_dept_parent_level
ON service_departments(parent_id, unit_level);

CREATE INDEX IF NOT EXISTS idx_permit_sources_bound_dept
ON permit_sources(bound_department_id);

CREATE INDEX IF NOT EXISTS idx_permit_sources_uploader
ON permit_sources(uploader_department_id);

-- 6. 数据迁移：根据现有grade设置unit_level
-- 市局管理员（grade >= 90）设置为admin
UPDATE service_departments
SET unit_level = 'admin'
WHERE grade >= 90;

-- 根节点且grade < 90的设置为district（区局子管理员）
UPDATE service_departments
SET unit_level = 'district'
WHERE parent_id IS NULL AND grade < 90;

-- 有父节点且grade < 90的设置为unit（区级单位）
UPDATE service_departments
SET unit_level = 'unit'
WHERE parent_id IS NOT NULL AND grade < 90;

-- 7. 为unit_level字段添加NOT NULL约束（在更新数据后）
ALTER TABLE service_departments
ALTER COLUMN unit_level SET NOT NULL;

COMMIT;