export const resolveAssigneeIdentityId = (user) => {
	if (!user) return '';
	const id = user.identityId ?? user.userIdentityId ?? user.userId ?? '';
	return id === '' || id == null ? '' : String(id);
};

export const getAssigneeItemKey = (user) => {
	const identityId = resolveAssigneeIdentityId(user);
	if (identityId) return `identity-${identityId}`;
	return `user-${user.userId || user.nickName || ''}`;
};

export const formatAssigneeDisplayName = (user) => {
	if (!user) return '';
	if (user.identityName) {
		return `${user.nickName || user.userName || ''}_${user.identityName}`;
	}
	if (user.postName) {
		return `${user.nickName || user.userName || ''}_${user.postName}`;
	}
	return user.nickName || user.userName || user.name || '未知人员';
};

export const normalizeApproverDeptTree = (data) => {
	if (!data) return [];
	if (Array.isArray(data)) return data;
	if (Array.isArray(data.records)) return data.records;
	if (Array.isArray(data.list)) return data.list;
	return [];
};

export const findAssigneeUserInDeptTree = (depts, identityId) => {
	if (!identityId || !Array.isArray(depts)) return null;
	for (const dept of depts) {
		const user = (dept.users || []).find(
			(item) => String(resolveAssigneeIdentityId(item)) === String(identityId)
		);
		if (user) return user;
		if (dept.children?.length) {
			const found = findAssigneeUserInDeptTree(dept.children, identityId);
			if (found) return found;
		}
	}
	return null;
};

/** 将部门树拍平为可渲染行（部门标题 + 人员），避免小程序递归组件不展示子部门 */
export const flattenApproverDeptTree = (depts, level = 0) => {
	const rows = [];
	if (!Array.isArray(depts)) return rows;
	for (const dept of depts) {
		rows.push({
			type: 'dept',
			key: `dept-${dept.deptId ?? dept.deptName ?? level}`,
			deptName: dept.deptName || '',
			level
		});
		for (const user of dept.users || []) {
			rows.push({
				type: 'user',
				key: getAssigneeItemKey(user),
				user,
				level: level + 1
			});
		}
		if (dept.children?.length) {
			rows.push(...flattenApproverDeptTree(dept.children, level + 1));
		}
	}
	return rows;
};