package service

import (
	"context"
	"log"
	"strings"

	"affiliate_dash/internal/model"
	"gorm.io/gorm"
)

// Token 生命周期事件类型。
const (
	rockTokenEventCreated       = "created"
	rockTokenEventStatusChanged = "status_changed"
	rockTokenEventDeleted       = "deleted"
	rockTokenEventRestored      = "restored"
)

// Token 状态来源，用于前端展示流转原因。
const (
	rockTokenSourceAssign      = "assign"
	rockTokenSourceBindCheck   = "bindcheck"
	rockTokenSourceRedeem      = "redeem"
	rockTokenSourceRefresh     = "refresh"
	rockTokenSourceRelease     = "release"
	rockTokenSourceReset       = "reset"
	rockTokenSourceManual      = "manual"
	rockTokenSourceOrderCancel = "order_cancel"
	rockTokenSourcePurchase    = "purchase"
	rockTokenSourcePackageSync = "package_sync"
	rockTokenSourceDelete      = "delete"
	rockTokenSourceRestore     = "restore"
)

// writeRockTokenStatusLog 记录 Token 生命周期/状态变化。
//
// 采用 best-effort：日志写入失败只打印错误，不影响主流程（避免因为审计表异常阻断发货）。
func writeRockTokenStatusLog(tx *gorm.DB, token *model.RockToken, eventType, from, to, source, reason string, forced bool, actorUserID *uint) {
	if tx == nil || token == nil || token.ID == 0 {
		return
	}
	entry := &model.RockTokenStatusLog{
		TokenID:         token.ID,
		UpstreamTokenID: strings.TrimSpace(token.UpstreamTokenID),
		EventType:       eventType,
		FromStatus:      from,
		ToStatus:        to,
		Source:          source,
		Reason:          truncateRunes(strings.TrimSpace(reason), 240),
		Forced:          forced,
		ActorUserID:     actorUserID,
	}
	if err := tx.Create(entry).Error; err != nil {
		log.Printf("[Rock] 写入 Token 状态日志失败 token=%d %s->%s: %v", token.ID, from, to, err)
	}
}

// writeRockTokenStatusChange 仅在状态确实发生变化时写日志。
func writeRockTokenStatusChange(tx *gorm.DB, token *model.RockToken, from, to, source, reason string, forced bool, actorUserID *uint) {
	if strings.TrimSpace(from) == strings.TrimSpace(to) {
		return
	}
	writeRockTokenStatusLog(tx, token, rockTokenEventStatusChanged, from, to, source, reason, forced, actorUserID)
}

func truncateRunes(value string, limit int) string {
	if limit <= 0 {
		return ""
	}
	runes := []rune(value)
	if len(runes) <= limit {
		return value
	}
	return string(runes[:limit])
}

// ListTokenStatusLogs 返回指定 Token 的状态历史（最新在前）。
func (s *RockService) ListTokenStatusLogs(ctx context.Context, tokenID uint) ([]model.RockTokenStatusLog, error) {
	var token model.RockToken
	if err := s.db.WithContext(ctx).Unscoped().First(&token, tokenID).Error; err != nil {
		return nil, err
	}
	var logs []model.RockTokenStatusLog
	if err := s.db.WithContext(ctx).
		Where("token_id = ?", tokenID).
		Order("id DESC").
		Limit(200).
		Find(&logs).Error; err != nil {
		return nil, err
	}
	return logs, nil
}