//
//  RolePermissionMatching.swift
//  suixinkan
//
//  Created by Codex on 2026/6/29.
//

import Foundation

/// 角色权限匹配工具，按 role_code 优先、legacy id、角色名顺序解析当前角色。
enum RolePermissionMatching {
    /// 解析当前 App 角色，用于快照迁移和 session 补全。
    static func resolveRoleCode(
        roleCode: String?,
        roleId: Int?,
        roleName: String?,
        permissions: [RolePermissionResponse] = []
    ) -> AppRoleCode? {
        if let code = AppRoleCode.fromCode(roleCode) { return code }
        if let legacyId = roleId, legacyId > 0, let code = AppRoleCode.fromLegacyRoleId(legacyId) {
            return code
        }
        if let code = AppRoleCode.fromRoleName(roleName) { return code }
        return inferFromPermissionList(roleId: roleId, roleName: roleName, permissions: permissions)
    }

    /// 在角色权限列表中匹配当前角色，优先 role_code。
    static func match(
        in permissions: [RolePermissionResponse],
        roleCode: String?,
        roleId: Int?,
        roleName: String?
    ) -> RolePermissionResponse? {
        if let code = AppRoleCode.fromCode(roleCode) {
            if let matched = permissions.first(where: { AppRoleCode.fromCode($0.role.roleCode) == code }) {
                return matched
            }
        }
        if let roleId, roleId > 0,
           let matched = permissions.first(where: { $0.role.id == roleId }) {
            return matched
        }
        let trimmedName = roleName?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        if !trimmedName.isEmpty {
            if let matched = permissions.first(where: { item in
                let name = item.role.name.trimmingCharacters(in: .whitespacesAndNewlines)
                return !name.isEmpty && (name.contains(trimmedName) || trimmedName.contains(name))
            }) {
                return matched
            }
        }
        return nil
    }

    /// 从权限列表推断角色 code。
    private static func inferFromPermissionList(
        roleId: Int?,
        roleName: String?,
        permissions: [RolePermissionResponse]
    ) -> AppRoleCode? {
        guard !permissions.isEmpty else { return nil }
        if let roleId, roleId > 0,
           let item = permissions.first(where: { $0.role.id == roleId }) {
            return AppRoleCode.fromCode(item.role.roleCode) ?? AppRoleCode.fromRoleName(item.role.name)
        }
        let trimmedName = roleName?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        if !trimmedName.isEmpty,
           let item = permissions.first(where: { item in
               let name = item.role.name.trimmingCharacters(in: .whitespacesAndNewlines)
               return !name.isEmpty && (name.contains(trimmedName) || trimmedName.contains(name))
           }) {
            return AppRoleCode.fromCode(item.role.roleCode) ?? AppRoleCode.fromRoleName(item.role.name)
        }
        return nil
    }
}