package polling

import (
	"context"
	"fmt"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// validatePollingConfig 校验轮询配置：间隔为 0（不检查）或不小于最小间隔；至少配置一种间隔；
// 重置日前加密的两个字段成对配置；匹配"无套餐且已销售"或"在库"的配置卡状态检查间隔必须为正数。
// 现有 Handler 未调用校验器，校验在服务层完成。
func validatePollingConfig(cfg *model.PollingConfig) error {
	intervals := []struct {
		name  string
		value *int
		min   int
	}{
		{"实名检查间隔", cfg.RealnameCheckInterval, 30},
		{"流量检查间隔", cfg.CarddataCheckInterval, 60},
		{"套餐检查间隔", cfg.PackageCheckInterval, 60},
		{"保护期一致性检查间隔", cfg.ProtectCheckInterval, 30},
		{"卡状态检查间隔", cfg.CardStatusCheckInterval, 30},
	}
	configured := false
	for _, item := range intervals {
		if item.value == nil {
			continue
		}
		configured = true
		if *item.value < 0 || (*item.value > 0 && *item.value < item.min) {
			return errors.New(errors.CodeInvalidParam, fmt.Sprintf("轮询配置参数不合法：%s须为 0（不检查）或不小于 %d 秒", item.name, item.min))
		}
	}
	if !configured {
		return errors.New(errors.CodeInvalidParam, "至少需要配置一种检查间隔")
	}
	if cfg.PackageState != nil && *cfg.PackageState != "" && !validPackageState(*cfg.PackageState) {
		return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：套餐状态取值不合法")
	}
	if cfg.AssetStatus != nil && (*cfg.AssetStatus < constants.AssetStatusInStock || *cfg.AssetStatus > constants.AssetStatusDeactivated) {
		return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：资产状态取值不合法")
	}
	if (cfg.PreResetWindow == nil) != (cfg.PreResetCarddataInterval == nil) {
		return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：重置日前窗口长度与窗口内流量间隔须同时配置或同时为空")
	}
	if cfg.PreResetWindow != nil && (*cfg.PreResetWindow < 60 || *cfg.PreResetCarddataInterval < 60) {
		return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：重置日前窗口长度与窗口内流量间隔不小于 60 秒")
	}
	if requiresCardStatusCheck(cfg) && (cfg.CardStatusCheckInterval == nil || *cfg.CardStatusCheckInterval <= 0) {
		return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：匹配无套餐已销售卡或在库卡的配置必须配置卡状态检查间隔（正数），用于发现上游开机后停机")
	}
	return nil
}

// requiresCardStatusCheck 判断配置是否匹配必须兜底查卡状态的层：在库，或无套餐且已销售。
func requiresCardStatusCheck(cfg *model.PollingConfig) bool {
	if cfg.AssetStatus != nil && *cfg.AssetStatus == constants.AssetStatusInStock {
		return true
	}
	return cfg.AssetStatus != nil && *cfg.AssetStatus == constants.AssetStatusSold &&
		cfg.PackageState != nil && *cfg.PackageState == constants.PollingPackageStateNone
}

func validPackageState(state string) bool {
	for _, item := range constants.PollingPackageStates {
		if item == state {
			return true
		}
	}
	return false
}

// applyPollingConfigClearFields 把指定字段清空为 NULL：间隔清空即改为继承，匹配条件清空即不限。
func applyPollingConfigClearFields(cfg *model.PollingConfig, fields []dto.PollingConfigClearField) error {
	for _, field := range fields {
		switch string(field) {
		case "realname_check_interval":
			cfg.RealnameCheckInterval = nil
		case "carddata_check_interval":
			cfg.CarddataCheckInterval = nil
		case "package_check_interval":
			cfg.PackageCheckInterval = nil
		case "card_status_check_interval":
			cfg.CardStatusCheckInterval = nil
		case "carrier_id":
			cfg.CarrierID = nil
		case "package_state":
			cfg.PackageState = nil
		case "asset_status":
			cfg.AssetStatus = nil
		case "pre_reset_window":
			cfg.PreResetWindow = nil
		case "pre_reset_carddata_interval":
			cfg.PreResetCarddataInterval = nil
		default:
			return errors.New(errors.CodeInvalidParam, "轮询配置参数不合法：不支持清空字段 "+string(field))
		}
	}
	return nil
}

// priorityWarnings 返回与其他启用配置优先级相同且匹配条件可能重叠的提示；只提示不拦截。
func (s *ConfigService) priorityWarnings(ctx context.Context, cfg *model.PollingConfig) []string {
	others, err := s.configStore.ListEnabled(ctx)
	if err != nil {
		return nil
	}
	var warnings []string
	for _, other := range others {
		if other.ID == cfg.ID || other.Priority != cfg.Priority || !conditionsMayOverlap(cfg, other) {
			continue
		}
		warnings = append(warnings, fmt.Sprintf("与配置「%s」优先级同为 %d 且匹配条件可能重叠，相同优先级按配置 ID 升序生效", other.ConfigName, cfg.Priority))
	}
	return warnings
}

// conditionsMayOverlap 判断两条配置是否可能匹配同一张卡：任一维度两边都填且取值不同即不重叠。
func conditionsMayOverlap(a, b *model.PollingConfig) bool {
	if a.CardCondition != "" && b.CardCondition != "" && a.CardCondition != b.CardCondition {
		return false
	}
	if a.CardCategory != "" && b.CardCategory != "" && a.CardCategory != b.CardCategory {
		return false
	}
	if a.CarrierID != nil && b.CarrierID != nil && *a.CarrierID != *b.CarrierID {
		return false
	}
	if a.AssetStatus != nil && b.AssetStatus != nil && *a.AssetStatus != *b.AssetStatus {
		return false
	}
	if a.PackageState != nil && b.PackageState != nil && *a.PackageState != *b.PackageState {
		return false
	}
	return true
}