package automation

import (
	"context"
	"encoding/json"

	"gorm.io/datatypes"
)

// ===========================
// Automation Execution Logging
// ===========================

// ExecutionLogService records automation rule and macro execution events for audit trail.
// Reference: Chatwoot does not explicitly store automation execution logs —
// gochat adds this for debugging, monitoring, and compliance per M6 requirements.
type ExecutionLogService struct {
	db DBProvider
}

// ActionExecutionResult records the result of one action within a rule execution.
type ActionExecutionResult struct {
	ActionName   string `json:"action_name"`
	Status       string `json:"status"`
	Error        string `json:"error,omitempty"`
	DeliveryType string `json:"delivery_type,omitempty"`
	Target       string `json:"target,omitempty"`
	Attempts     int    `json:"attempts,omitempty"`
	ResponseCode int    `json:"response_code,omitempty"`
	ResponseBody string `json:"response_body,omitempty"`
	Retryable    bool   `json:"retryable,omitempty"`
	Queued       bool   `json:"queued,omitempty"`
}

// NewExecutionLogService creates a new ExecutionLogService.
func NewExecutionLogService(db DBProvider) *ExecutionLogService {
	return &ExecutionLogService{db: db}
}

// LogRuleExecution records an automation rule execution event.
func (s *ExecutionLogService) LogRuleExecution(ctx context.Context, accountID, ruleID, conversationID uint, status string, actionsExecuted, actionsFailed int, errorMsg string) error {
	return s.LogRuleExecutionWithResults(ctx, accountID, ruleID, conversationID, "", status, actionsExecuted, actionsFailed, errorMsg, nil)
}

// LogRuleExecutionWithResults records a rule evaluation with optional event name and per-action results.
func (s *ExecutionLogService) LogRuleExecutionWithResults(ctx context.Context, accountID, ruleID, conversationID uint, eventName, status string, actionsExecuted, actionsFailed int, errorMsg string, actionResults []ActionExecutionResult) error {
	resultsJSON := datatypes.JSON([]byte("[]"))
	if actionResults != nil {
		payload, err := json.Marshal(actionResults)
		if err != nil {
			return err
		}
		resultsJSON = datatypes.JSON(payload)
	}
	record := &AutomationExecution{
		AccountID:       accountID,
		RuleID:          ruleID,
		ConversationID:  conversationID,
		EventName:       eventName,
		Status:          status,
		ActionsExecuted: actionsExecuted,
		ActionsFailed:   actionsFailed,
		ActionResults:   resultsJSON,
		ErrorMessage:    errorMsg,
	}
	return s.db.DB().WithContext(ctx).Select(
		"AccountID", "RuleID", "ConversationID",
		"EventName", "Status", "ActionsExecuted", "ActionsFailed", "ActionResults", "ErrorMessage",
	).Create(record).Error
}

// ListRuleExecutions retrieves execution logs for an automation rule, ordered by most recent.
func (s *ExecutionLogService) ListRuleExecutions(ctx context.Context, accountID, ruleID uint, limit int) ([]AutomationExecution, error) {
	var logs []AutomationExecution
	query := s.db.DB().WithContext(ctx).
		Where("account_id = ? AND rule_id = ?", accountID, ruleID).
		Order("created_at DESC")

	if limit > 0 {
		query = query.Limit(limit)
	}

	if err := query.Find(&logs).Error; err != nil {
		return nil, err
	}
	return logs, nil
}

// ListConversationExecutions retrieves execution logs for a conversation, ordered by most recent.
func (s *ExecutionLogService) ListConversationExecutions(ctx context.Context, accountID, conversationID uint, limit int) ([]AutomationExecution, error) {
	var logs []AutomationExecution
	query := s.db.DB().WithContext(ctx).
		Where("account_id = ? AND conversation_id = ?", accountID, conversationID).
		Order("created_at DESC")

	if limit > 0 {
		query = query.Limit(limit)
	}

	if err := query.Find(&logs).Error; err != nil {
		return nil, err
	}
	return logs, nil
}

// LogMacroExecution records a macro execution event (uses MacroExecution model).
func (s *ExecutionLogService) LogMacroExecution(ctx context.Context, macroID, conversationID, userID uint) error {
	record := &MacroExecution{
		MacroID:        macroID,
		ConversationID: conversationID,
		ExecutedByID:   userID,
	}
	return s.db.DB().WithContext(ctx).Create(record).Error
}

// ListMacroExecutions retrieves execution logs for a macro, ordered by most recent.
func (s *ExecutionLogService) ListMacroExecutions(ctx context.Context, macroID uint, limit int) ([]MacroExecution, error) {
	var logs []MacroExecution
	query := s.db.DB().WithContext(ctx).
		Where("macro_id = ?", macroID).
		Order("id DESC")

	if limit > 0 {
		query = query.Limit(limit)
	}

	if err := query.Find(&logs).Error; err != nil {
		return nil, err
	}
	return logs, nil
}

// ExecutionStatus constants.
const (
	ExecutionStatusSuccess = "success"
	ExecutionStatusPartial = "partial" // some actions succeeded, some failed
	ExecutionStatusFailed  = "failed"
	ExecutionStatusSkipped = "skipped"
)