package service

import (
	"context"
	"fmt"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	applogger "github.com/gochat/gochat/pkg/logger"
)

// AuditService implements business logic for AuditLog operations.
// Reference: Chatwoot enterprise audit log feature + P2B M11 spec
type AuditService struct {
	repo *repository.AuditRepo
}

// NewAuditService creates a new AuditLog service.
func NewAuditService(repo *repository.AuditRepo) *AuditService {
	return &AuditService{repo: repo}
}

// ListByAccount retrieves paginated audit log entries for an account with optional filters.
// page and pageSize follow the project pagination convention (page >= 1, pageSize capped at 100).
func (s *AuditService) ListByAccount(ctx context.Context, accountID uint, action string, auditableType string, page int, pageSize int) ([]model.Audit, int64, error) {
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 25
	}
	if pageSize > 100 {
		pageSize = 100
	}

	offset := (page - 1) * pageSize
	audits, total, err := s.repo.FindByAccount(ctx, accountID, action, auditableType, offset, pageSize)
	if err != nil {
		applogger.L().Errorf("AuditService.ListByAccount account=%d action=%s auditableType=%s: %v", accountID, action, auditableType, err)
		return nil, 0, fmt.Errorf("failed to list audit logs: %w", err)
	}

	return audits, total, nil
}

// CreateAudit creates a new audit log entry.
func (s *AuditService) CreateAudit(ctx context.Context, audit *model.Audit) (*model.Audit, error) {
	if err := s.repo.Create(ctx, audit); err != nil {
		applogger.L().Errorf("AuditService.CreateAudit: %v", err)
		return nil, fmt.Errorf("failed to create audit log: %w", err)
	}
	return audit, nil
}

// GetByID retrieves a single audit log entry by ID.
func (s *AuditService) GetByID(ctx context.Context, id uint) (*model.Audit, error) {
	audit, err := s.repo.FindByID(ctx, id)
	if err != nil {
		applogger.L().Errorf("AuditService.GetByID id=%d: %v", id, err)
		return nil, fmt.Errorf("audit log not found: %w", err)
	}
	return audit, nil
}