package tender_approval

import (
	"regexp"
	"strings"
)

// Validation functions for tender approval domain

// IsValidTenderID validates if the tender ID format is correct
func IsValidTenderID(tenderID string) bool {
	if tenderID == "" {
		return false
	}

	// Tender ID should be a non-empty string
	// You can add more specific validation rules here based on your tender ID format
	return len(tenderID) > 0 && len(tenderID) <= 100
}

// IsValidCompanyID validates if the company ID format is correct
func IsValidCompanyID(companyID string) bool {
	if companyID == "" {
		return false
	}

	// Company ID should be a non-empty string
	// You can add more specific validation rules here based on your company ID format
	return len(companyID) > 0 && len(companyID) <= 100
}

// IsValidSubmissionMode validates if the submission mode is valid
func IsValidSubmissionMode(mode string) bool {
	validModes := []string{
		string(SubmissionModeSelfApply),
		string(SubmissionModePartnership),
	}

	for _, validMode := range validModes {
		if strings.EqualFold(mode, validMode) {
			return true
		}
	}

	return false
}

// IsValidStatus validates if the approval status is valid
func IsValidStatus(status string) bool {
	validStatuses := []string{
		string(ApprovalStatusApproved),
		string(ApprovalStatusRejected),
	}

	for _, validStatus := range validStatuses {
		if strings.EqualFold(status, validStatus) {
			return true
		}
	}

	return false
}

// IsValidNotes validates if the notes field is valid
func IsValidNotes(notes *string) bool {
	if notes == nil {
		return true // Notes are optional
	}

	// Notes should be between 0 and 1000 characters
	return len(*notes) <= 1000
}

// IsValidReason validates if the rejection reason is valid
func IsValidReason(reason string) bool {
	// Reason should be between 10 and 500 characters
	if len(reason) < 10 || len(reason) > 500 {
		return false
	}

	// Reason should not contain only whitespace
	if strings.TrimSpace(reason) == "" {
		return false
	}

	return true
}

// IsValidTimestamp validates if the timestamp is within reasonable range
func IsValidTimestamp(timestamp int64) bool {
	// Timestamp should be positive and not too far in the future
	// You can adjust these limits based on your requirements
	if timestamp <= 0 {
		return false
	}

	// Check if timestamp is not too far in the future (e.g., 10 years from now)
	maxFutureTimestamp := int64(10 * 365 * 24 * 60 * 60) // 10 years in seconds
	return timestamp <= maxFutureTimestamp
}

// IsValidLimit validates if the limit parameter is valid
func IsValidLimit(limit int) bool {
	return limit > 0 && limit <= 100
}

// IsValidOffset validates if the offset parameter is valid
func IsValidOffset(offset int) bool {
	return offset >= 0
}

// IsValidSortBy validates if the sort by parameter is valid
func IsValidSortBy(sortBy string) bool {
	validSortFields := []string{
		"created_at",
		"updated_at",
		"status",
		"submission_mode",
	}

	for _, validField := range validSortFields {
		if strings.EqualFold(sortBy, validField) {
			return true
		}
	}

	return false
}

// IsValidSortOrder validates if the sort order parameter is valid
func IsValidSortOrder(sortOrder string) bool {
	validOrders := []string{"asc", "desc"}

	for _, validOrder := range validOrders {
		if strings.EqualFold(sortOrder, validOrder) {
			return true
		}
	}

	return false
}

// SanitizeString removes potentially dangerous characters from input strings
func SanitizeString(input string) string {
	// Remove HTML tags
	htmlTagRegex := regexp.MustCompile(`<[^>]*>`)
	sanitized := htmlTagRegex.ReplaceAllString(input, "")

	// Remove script tags
	scriptRegex := regexp.MustCompile(`(?i)<script[^>]*>.*?</script>`)
	sanitized = scriptRegex.ReplaceAllString(sanitized, "")

	// Trim whitespace
	sanitized = strings.TrimSpace(sanitized)

	return sanitized
}

// ValidateSearchQuery validates if the search query is valid
func ValidateSearchQuery(query string) bool {
	if query == "" {
		return true // Empty query is valid
	}

	// Query should not be too long
	if len(query) > 200 {
		return false
	}

	// Query should not contain only special characters
	if regexp.MustCompile(`^[^a-zA-Z0-9\s]+$`).MatchString(query) {
		return false
	}

	return true
}