package services

import (
	"context"
	"fmt"
	"time"

	"tyapi-server/internal/domains/certification/entities"
	"tyapi-server/internal/domains/certification/enums"
	"tyapi-server/internal/domains/certification/repositories"

	"go.uber.org/zap"
)

// CertificationStateMachine 认证状态机
type CertificationStateMachine struct {
	stateManager *CertificationStateManager
	certRepo     repositories.CertificationRepository
	logger       *zap.Logger
}

// NewCertificationStateMachine 创建认证状态机
func NewCertificationStateMachine(
	certRepo repositories.CertificationRepository,
	logger *zap.Logger,
) *CertificationStateMachine {
	return &CertificationStateMachine{
		stateManager: NewCertificationStateManager(),
		certRepo:     certRepo,
		logger:       logger,
	}
}

// CanTransition 检查是否可以转换到指定状态
func (sm *CertificationStateMachine) CanTransition(
	from enums.CertificationStatus,
	to enums.CertificationStatus,
	isUser bool,
	isAdmin bool,
) (bool, string) {
	return sm.stateManager.CanTransition(from, to, isUser, isAdmin)
}

// TransitionTo 执行状态转换
func (sm *CertificationStateMachine) TransitionTo(
	ctx context.Context,
	certificationID string,
	targetStatus enums.CertificationStatus,
	isUser bool,
	isAdmin bool,
	metadata map[string]interface{},
) error {
	// 获取当前认证记录
	cert, err := sm.certRepo.GetByID(ctx, certificationID)
	if err != nil {
		return fmt.Errorf("获取认证记录失败: %w", err)
	}

	// 检查是否可以转换
	canTransition, reason := sm.CanTransition(cert.Status, targetStatus, isUser, isAdmin)
	if !canTransition {
		return fmt.Errorf("状态转换失败: %s", reason)
	}

	// 更新状态和时间戳
	oldStatus := cert.Status
	cert.Status = targetStatus
	sm.updateTimestamp(&cert, targetStatus)

	// 更新其他字段
	sm.updateCertificationFields(&cert, targetStatus, metadata)

	// 保存到数据库
	if err := sm.certRepo.Update(ctx, cert); err != nil {
		return fmt.Errorf("保存状态转换失败: %w", err)
	}

	sm.logger.Info("认证状态转换成功",
		zap.String("certification_id", certificationID),
		zap.String("from_status", string(oldStatus)),
		zap.String("to_status", string(targetStatus)),
		zap.Bool("is_user", isUser),
		zap.Bool("is_admin", isAdmin),
	)

	return nil
}

// updateTimestamp 更新对应的时间戳字段
func (sm *CertificationStateMachine) updateTimestamp(cert *entities.Certification, status enums.CertificationStatus) {
	stateConfig := sm.stateManager.GetStateConfig(status)
	if stateConfig == nil || stateConfig.TimestampField == "" {
		return
	}

	now := time.Now()

	switch stateConfig.TimestampField {
	case "InfoSubmittedAt":
		cert.InfoSubmittedAt = &now
	case "EnterpriseVerifiedAt":
		cert.EnterpriseVerifiedAt = &now
	case "ContractAppliedAt":
		cert.ContractAppliedAt = &now
	case "ContractSignedAt":
		cert.ContractSignedAt = &now
	case "CompletedAt":
		cert.CompletedAt = &now
	}
}

// updateCertificationFields 根据状态更新认证记录的其他字段
func (sm *CertificationStateMachine) updateCertificationFields(
	cert *entities.Certification,
	status enums.CertificationStatus,
	metadata map[string]interface{},
) {
	switch status {
	case enums.StatusContractSigned:
		if contractURL, ok := metadata["contract_url"].(string); ok {
			cert.ContractURL = contractURL
		}
	}
}

// GetValidNextStatuses 获取当前状态可以转换到的下一个状态列表
func (sm *CertificationStateMachine) GetValidNextStatuses(
	currentStatus enums.CertificationStatus,
	isUser bool,
	isAdmin bool,
) []enums.CertificationStatus {
	return sm.stateManager.GetNextValidStatuses(currentStatus)
}

// GetTransitionAction 获取状态转换对应的操作名称
func (sm *CertificationStateMachine) GetTransitionAction(
	from enums.CertificationStatus,
	to enums.CertificationStatus,
) string {
	transitions := sm.stateManager.GetTransitionConfigs(from)
	for _, transition := range transitions {
		if transition.To == to {
			return transition.Action
		}
	}
	return ""
}

// GetTransitionActionName 获取状态转换对应的操作中文名称
func (sm *CertificationStateMachine) GetTransitionActionName(
	from enums.CertificationStatus,
	to enums.CertificationStatus,
) string {
	transitions := sm.stateManager.GetTransitionConfigs(from)
	for _, transition := range transitions {
		if transition.To == to {
			return transition.ActionName
		}
	}
	return ""
}

// GetStateConfig 获取状态配置
func (sm *CertificationStateMachine) GetStateConfig(status enums.CertificationStatus) *StateConfig {
	return sm.stateManager.GetStateConfig(status)
}

// GetProgressPercentage 获取进度百分比
func (sm *CertificationStateMachine) GetProgressPercentage(status enums.CertificationStatus) int {
	return sm.stateManager.GetProgressPercentage(status)
}

// IsUserActionRequired 检查是否需要用户操作
func (sm *CertificationStateMachine) IsUserActionRequired(status enums.CertificationStatus) bool {
	return sm.stateManager.IsUserActionRequired(status)
}

// IsAdminActionRequired 检查是否需要管理员操作
func (sm *CertificationStateMachine) IsAdminActionRequired(status enums.CertificationStatus) bool {
	return sm.stateManager.IsAdminActionRequired(status)
}

// GetTransitionHistory 获取状态转换历史
func (sm *CertificationStateMachine) GetTransitionHistory(ctx context.Context, certificationID string) ([]map[string]interface{}, error) {
	cert, err := sm.certRepo.GetByID(ctx, certificationID)
	if err != nil {
		return nil, fmt.Errorf("获取认证记录失败: %w", err)
	}

	history := []map[string]interface{}{}

	// 添加创建时间
	history = append(history, map[string]interface{}{
		"status":    "CREATED",
		"timestamp": cert.CreatedAt,
		"action":    "create",
		"performer": "system",
		"metadata":  map[string]interface{}{},
	})

	// 添加各个时间节点的状态转换
	if cert.InfoSubmittedAt != nil {
		history = append(history, map[string]interface{}{
			"status":    string(enums.StatusInfoSubmitted),
			"timestamp": *cert.InfoSubmittedAt,
			"action":    "submit_info",
			"performer": "user",
			"metadata":  map[string]interface{}{},
		})
	}

	if cert.EnterpriseVerifiedAt != nil {
		history = append(history, map[string]interface{}{
			"status":    string(enums.StatusEnterpriseVerified),
			"timestamp": *cert.EnterpriseVerifiedAt,
			"action":    "enterprise_verify",
			"performer": "user",
			"metadata":  map[string]interface{}{},
		})
	}

	if cert.ContractAppliedAt != nil {
		history = append(history, map[string]interface{}{
			"status":    string(enums.StatusContractApplied),
			"timestamp": *cert.ContractAppliedAt,
			"action":    "apply_contract",
			"performer": "user",
			"metadata":  map[string]interface{}{},
		})
	}

	if cert.ContractSignedAt != nil {
		metadata := map[string]interface{}{}
		if cert.ContractURL != "" {
			metadata["contract_url"] = cert.ContractURL
		}

		history = append(history, map[string]interface{}{
			"status":    string(enums.StatusContractSigned),
			"timestamp": *cert.ContractSignedAt,
			"action":    "sign_contract",
			"performer": "user",
			"metadata":  metadata,
		})
	}

	if cert.CompletedAt != nil {
		history = append(history, map[string]interface{}{
			"status":    string(enums.StatusCompleted),
			"timestamp": *cert.CompletedAt,
			"action":    "complete",
			"performer": "system",
			"metadata":  map[string]interface{}{},
		})
	}

	return history, nil
}