-- 员工管理模块 MySQL 8.0 DDL（生产库手动执行）
CREATE TABLE IF NOT EXISTS staff_employee (
    id              BIGINT          NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    employee_no     VARCHAR(32)     NOT NULL COMMENT '工号，唯一标识',
    name            VARCHAR(64)     NOT NULL COMMENT '员工姓名',
    id_number       VARCHAR(64)     NOT NULL COMMENT '身份证号，应用层加密存储',
    gender          TINYINT         DEFAULT 0 COMMENT '性别：0-未知，1-男，2-女',
    department_id   BIGINT          NOT NULL COMMENT '所属部门ID',
    department_name VARCHAR(128)    DEFAULT '' COMMENT '部门名称（冗余，加快查询）',
    position        VARCHAR(128)    NOT NULL COMMENT '岗位名称',
    hire_date       DATE            NOT NULL COMMENT '入职日期',
    phone           VARCHAR(20)     DEFAULT NULL COMMENT '联系电话',
    email           VARCHAR(128)    DEFAULT NULL COMMENT '邮箱',
    emergency_contact VARCHAR(64)   DEFAULT NULL COMMENT '紧急联系人姓名',
    emergency_phone VARCHAR(20)     DEFAULT NULL COMMENT '紧急联系人电话',
    status          VARCHAR(16)     NOT NULL DEFAULT 'active' COMMENT '状态：active-在职，inactive-离职，probation-试用期',
    created_by      BIGINT          DEFAULT NULL COMMENT '创建人ID',
    updated_by      BIGINT          DEFAULT NULL COMMENT '最后更新人ID',
    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    updated_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    PRIMARY KEY (id),
    UNIQUE KEY uk_employee_no (employee_no),
    UNIQUE KEY uk_id_number (id_number),
    KEY idx_name (name),
    KEY idx_department_id (department_id),
    KEY idx_status (status),
    KEY idx_hire_date (hire_date),
    KEY idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='员工主表';

CREATE TABLE IF NOT EXISTS staff_employee_extra (
    id                  BIGINT          NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    employee_id         BIGINT          NOT NULL COMMENT '员工ID',
    education           VARCHAR(32)     DEFAULT NULL COMMENT '学历',
    major               VARCHAR(128)    DEFAULT NULL COMMENT '专业',
    school              VARCHAR(128)    DEFAULT NULL COMMENT '毕业院校',
    graduation_date     DATE            DEFAULT NULL COMMENT '毕业时间',
    previous_company    VARCHAR(128)    DEFAULT NULL COMMENT '前工作单位',
    work_years          INT             DEFAULT 0 COMMENT '总工作年限',
    technical_level     VARCHAR(32)     DEFAULT NULL COMMENT '技术级别，仅 Admin/HR 可见',
    salary_grade        VARCHAR(32)     DEFAULT NULL COMMENT '薪资等级，仅 Admin/HR 可见',
    contract_type       VARCHAR(32)     DEFAULT NULL COMMENT '合同类型',
    contract_start      DATE            DEFAULT NULL COMMENT '合同开始日期',
    contract_end        DATE            DEFAULT NULL COMMENT '合同结束日期',
    probation_end       DATE            DEFAULT NULL COMMENT '试用期截止日',
    address             VARCHAR(256)    DEFAULT NULL COMMENT '现住址',
    remark              TEXT            DEFAULT NULL COMMENT '备注',
    created_at          DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    updated_at          DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    PRIMARY KEY (id),
    UNIQUE KEY uk_employee_id (employee_id),
    KEY idx_technical_level (technical_level),
    KEY idx_contract_end (contract_end)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='员工扩展信息表';

CREATE TABLE IF NOT EXISTS staff_change_log (
    id              BIGINT          NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    employee_id     BIGINT          NOT NULL COMMENT '员工ID',
    change_type     VARCHAR(32)     NOT NULL COMMENT '变更类型',
    old_value       VARCHAR(256)    DEFAULT NULL COMMENT '原值',
    new_value       VARCHAR(256)    DEFAULT NULL COMMENT '新值',
    operator_id     BIGINT          NOT NULL COMMENT '操作人ID',
    operator_name   VARCHAR(64)     DEFAULT NULL COMMENT '操作人姓名',
    change_reason   VARCHAR(512)    DEFAULT NULL COMMENT '变更原因',
    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '变更时间',
    PRIMARY KEY (id),
    KEY idx_employee_id (employee_id),
    KEY idx_change_type (change_type),
    KEY idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='员工变更记录表';

CREATE TABLE IF NOT EXISTS staff_audit_log (
    id              BIGINT          NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    target_type     VARCHAR(32)     NOT NULL COMMENT '操作目标类型',
    target_id       BIGINT          NOT NULL COMMENT '操作目标ID',
    operation       VARCHAR(32)     NOT NULL COMMENT '操作类型：CREATE/UPDATE/DELETE/VIEW',
    operator_id     BIGINT          NOT NULL COMMENT '操作人ID',
    operator_name   VARCHAR(64)     DEFAULT '' COMMENT '操作人姓名',
    field_name      VARCHAR(64)     DEFAULT NULL COMMENT '变更字段名',
    before_value    TEXT            DEFAULT NULL COMMENT '变更前值',
    after_value     TEXT            DEFAULT NULL COMMENT '变更后值',
    request_ip      VARCHAR(64)     DEFAULT NULL COMMENT '请求IP',
    user_agent      VARCHAR(512)    DEFAULT NULL COMMENT '浏览器UA',
    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '操作时间',
    PRIMARY KEY (id),
    KEY idx_target (target_type, target_id),
    KEY idx_operator_id (operator_id),
    KEY idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='操作审计日志表';

CREATE TABLE IF NOT EXISTS staff_department_cache (
    id              BIGINT          NOT NULL COMMENT '部门ID（来自 org-mgr）',
    name            VARCHAR(128)    NOT NULL COMMENT '部门名称',
    parent_id       BIGINT          DEFAULT NULL COMMENT '上级部门ID',
    level           INT             DEFAULT 0 COMMENT '层级深度',
    employee_count  INT             DEFAULT 0 COMMENT '部门人数',
    status          VARCHAR(16)     NOT NULL DEFAULT 'active' COMMENT '状态',
    sync_time       DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最后同步时间',
    PRIMARY KEY (id),
    KEY idx_parent_id (parent_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='部门信息本地缓存表';