package host

import (
	"strings"

	"hyapp/pkg/appcode"
	"hyapp/pkg/xerr"
)

type RoleScope string

const (
	RoleScopeCountry RoleScope = "country"
	RoleScopeRegion  RoleScope = "region"
	RoleScopeGlobal  RoleScope = "global"

	RoleScopeSceneOrganizationExpansion = "organization_role_expansion"
	RoleScopeSceneManagerOperations     = "manager_operations"
	// RoleScopeSceneManagerAddBDLeader 兼容上一版 gateway/admin 的策略查询，解析后统一返回 manager_operations。
	RoleScopeSceneManagerAddBDLeader = "manager_add_bd_leader"
)

// RoleScopePolicy 把 App 固有边界和可运营扩展能力分开；业务入口只根据解析结果判断目标范围。
type RoleScopePolicy struct {
	Scene                       string
	BaseScope                   RoleScope
	ExpandedScope               RoleScope
	RegionExpansionConfigurable bool
}

var defaultRoleScopePolicies = map[string]RoleScopePolicy{
	RoleScopeSceneOrganizationExpansion: {
		Scene:         RoleScopeSceneOrganizationExpansion,
		BaseScope:     RoleScopeRegion,
		ExpandedScope: RoleScopeRegion,
	},
	RoleScopeSceneManagerOperations: {
		Scene:                       RoleScopeSceneManagerOperations,
		BaseScope:                   RoleScopeCountry,
		ExpandedScope:               RoleScopeRegion,
		RegionExpansionConfigurable: true,
	},
}

var appRoleScopePolicyOverrides = map[string]map[string]RoleScopePolicy{
	"huwaa": {
		RoleScopeSceneOrganizationExpansion: {
			Scene:         RoleScopeSceneOrganizationExpansion,
			BaseScope:     RoleScopeGlobal,
			ExpandedScope: RoleScopeGlobal,
		},
		RoleScopeSceneManagerOperations: {
			Scene:         RoleScopeSceneManagerOperations,
			BaseScope:     RoleScopeGlobal,
			ExpandedScope: RoleScopeGlobal,
		},
	},
}

// ResolveRoleScopePolicy 是 App 差异的唯一解析入口；新增 App 只扩展注册表，不修改搜索或写入 handler。
func ResolveRoleScopePolicy(rawAppCode string, rawScene string) (RoleScopePolicy, error) {
	scene := strings.ToLower(strings.TrimSpace(rawScene))
	if scene == RoleScopeSceneManagerAddBDLeader {
		scene = RoleScopeSceneManagerOperations
	}
	policy, ok := defaultRoleScopePolicies[scene]
	if !ok {
		return RoleScopePolicy{}, xerr.New(xerr.InvalidArgument, "role scope scene is invalid")
	}
	if overrides := appRoleScopePolicyOverrides[appcode.Normalize(rawAppCode)]; overrides != nil {
		if override, exists := overrides[scene]; exists {
			policy = override
		}
	}
	return policy, nil
}

// EffectiveScope 只允许声明为 configurable 的策略接受经理个人扩区开关。
func (p RoleScopePolicy) EffectiveScope(regionExpansionEnabled bool) RoleScope {
	if p.RegionExpansionConfigurable && regionExpansionEnabled {
		return p.ExpandedScope
	}
	return p.BaseScope
}