package spam

import (
	"errors"
	"strings"

	"code.nonshy.com/nonshy/website/pkg/models"
)

// SpamWebsites to third-party video hosting apps: we already have our own chat room, and third-party links shared in
// public places can pose a risk to user privacy/safety.
var SpamWebsites = []string{
	"join.skype.com",
	"zoom.us",
	"whereby.com",
	"meet.jit.si",
	"https://t.me",
}

// DetectSpamMessage searches a message (such as a comment, forum post, etc.) for spammy contents such as Skype invite links
// and returns an error if found.
func DetectSpamMessage(message string) error {
	for _, link := range SpamWebsites {
		if strings.Contains(message, link) {
			return errors.New(
				"Your message could not be posted because it contains a link to a third-party video chat website. " +
					"In the interest of protecting our community, we do not allow linking to third-party video conferencing apps where user " +
					"privacy and security may not hold up to our standards, or where the content may run against our terms of service.",
			)
		}
	}

	return nil
}

// RestrictSearchTerm can remove/replace search words to exclude blacklisted terms.
func RestrictSearchTerms(terms *models.Search) (*models.Search, error) {
	var (
		m      = map[string]interface{}{}
		result = &models.Search{}
		r1, r2 int
	)

	// Map the blacklist for easy lookup.
	for _, term := range restrictedSearchTerms {
		m[term] = nil
	}

	// Filter the includes+excludes.
	result.Includes, r1 = restrictTermsFrom(terms.Includes, m)
	result.Excludes, r2 = restrictTermsFrom(terms.Excludes, m)

	// If we have excluded everything down to zero.
	if len(terms.Includes) > 0 && len(result.Includes) == 0 {
		result.Includes = append(result.Includes, "36c49b88-dd0c-4b9f-a4e1-f0c73c976ce2")
	}

	// Were there restrictions?
	if r1+r2 > 0 {
		return result, errors.New("some search terms were restricted")
	}

	return result, nil
}

// Restricted search terms.
var restrictedSearchTerms = []string{
	"open", "mind", "minded", "openminded", "openmind", "taboo", "tabboo", "perv", "pervy", "grew", "raised", "raise",
	"children", "kid", "kids", "dad", "dads", "mom", "moms", "underage", "yng", "ynger", "family", "families",
	"18", "shota", "shotacon", "loli", "lolicon", "jailbait", "incest", "limit", "limits",
}

func restrictTermsFrom(terms []string, blacklist map[string]interface{}) ([]string, int) {
	var (
		result []string
		count  int
	)

	for _, term := range terms {
		if _, ok := blacklist[strings.ToLower(term)]; ok {
			count++
			continue
		}
		result = append(result, term)
	}

	return result, count
}