package visibility

import (
	"fmt"

	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)

func (f *filter) pullRelevantAccountsFromStatus(targetStatus *gtsmodel.Status) (*relevantAccounts, error) {
	accounts := &relevantAccounts{
		MentionedAccounts:        []*gtsmodel.Account{},
		BoostedMentionedAccounts: []*gtsmodel.Account{},
	}

	// get the author account
	if targetStatus.GTSAuthorAccount == nil {
		statusAuthor := &gtsmodel.Account{}
		if err := f.db.GetByID(targetStatus.AccountID, statusAuthor); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting statusAuthor with id %s: %s", targetStatus.AccountID, err)
		}
		targetStatus.GTSAuthorAccount = statusAuthor
	}
	accounts.StatusAuthor = targetStatus.GTSAuthorAccount

	// get the replied to account from the status and add it to the pile
	if targetStatus.InReplyToAccountID != "" {
		repliedToAccount := &gtsmodel.Account{}
		if err := f.db.GetByID(targetStatus.InReplyToAccountID, repliedToAccount); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting repliedToAcount with id %s: %s", targetStatus.InReplyToAccountID, err)
		}
		accounts.ReplyToAccount = repliedToAccount
	}

	// now get all accounts with IDs that are mentioned in the status
	for _, mentionID := range targetStatus.Mentions {

		mention := &gtsmodel.Mention{}
		if err := f.db.GetByID(mentionID, mention); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting mention with id %s: %s", mentionID, err)
		}

		mentionedAccount := &gtsmodel.Account{}
		if err := f.db.GetByID(mention.TargetAccountID, mentionedAccount); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting mentioned account: %s", err)
		}
		accounts.MentionedAccounts = append(accounts.MentionedAccounts, mentionedAccount)
	}

	// get the boosted account from the status and add it to the pile
	if targetStatus.BoostOfID != "" {
		// retrieve the boosted status first
		boostedStatus := &gtsmodel.Status{}
		if err := f.db.GetByID(targetStatus.BoostOfID, boostedStatus); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting boostedStatus with id %s: %s", targetStatus.BoostOfID, err)
		}
		boostedAccount := &gtsmodel.Account{}
		if err := f.db.GetByID(boostedStatus.AccountID, boostedAccount); err != nil {
			return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting boostedAccount with id %s: %s", boostedStatus.AccountID, err)
		}
		accounts.BoostedStatusAuthor = boostedAccount

		// the boosted status might be a reply to another account so we should get that too
		if boostedStatus.InReplyToAccountID != "" {
			boostedStatusRepliedToAccount := &gtsmodel.Account{}
			if err := f.db.GetByID(boostedStatus.InReplyToAccountID, boostedStatusRepliedToAccount); err != nil {
				return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting boostedStatusRepliedToAccount with id %s: %s", boostedStatus.InReplyToAccountID, err)
			}
			accounts.BoostedReplyToAccount = boostedStatusRepliedToAccount
		}

		// now get all accounts with IDs that are mentioned in the status
		for _, mentionID := range boostedStatus.Mentions {
			mention := &gtsmodel.Mention{}
			if err := f.db.GetByID(mentionID, mention); err != nil {
				return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting boosted mention with id %s: %s", mentionID, err)
			}

			mentionedAccount := &gtsmodel.Account{}
			if err := f.db.GetByID(mention.TargetAccountID, mentionedAccount); err != nil {
				return accounts, fmt.Errorf("PullRelevantAccountsFromStatus: error getting boosted mentioned account: %s", err)
			}
			accounts.BoostedMentionedAccounts = append(accounts.BoostedMentionedAccounts, mentionedAccount)
		}
	}

	return accounts, nil
}

// relevantAccounts denotes accounts that are replied to, boosted by, or mentioned in a status.
type relevantAccounts struct {
	// Who wrote the status
	StatusAuthor *gtsmodel.Account
	// Who is the status replying to
	ReplyToAccount *gtsmodel.Account
	// Which accounts are mentioned (tagged) in the status
	MentionedAccounts []*gtsmodel.Account
	// Who authed the boosted status
	BoostedStatusAuthor *gtsmodel.Account
	// If the boosted status replies to another account, who does it reply to?
	BoostedReplyToAccount *gtsmodel.Account
	// Who is mentioned (tagged) in the boosted status
	BoostedMentionedAccounts []*gtsmodel.Account
}

// blockedDomain checks whether the given domain is blocked by us or not
func (f *filter) blockedDomain(host string) (bool, error) {
	b := &gtsmodel.DomainBlock{}
	err := f.db.GetWhere([]db.Where{{Key: "domain", Value: host, CaseInsensitive: true}}, b)
	if err == nil {
		// block exists
		return true, nil
	}

	if _, ok := err.(db.ErrNoEntries); ok {
		// there are no entries so there's no block
		return false, nil
	}

	// there's an actual error
	return false, err
}

// domainBlockedRelevant checks through all relevant accounts attached to a status
// to make sure none of them are domain blocked by this instance.
//
// Will return true+nil if there's a block, false+nil if there's no block, or
// an error if something goes wrong.
func (f *filter) domainBlockedRelevant(r *relevantAccounts) (bool, error) {
	if r.StatusAuthor != nil {
		b, err := f.blockedDomain(r.StatusAuthor.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	if r.ReplyToAccount != nil {
		b, err := f.blockedDomain(r.ReplyToAccount.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	for _, a := range r.MentionedAccounts {
		b, err := f.blockedDomain(a.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	if r.BoostedStatusAuthor != nil {
		b, err := f.blockedDomain(r.BoostedStatusAuthor.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	if r.BoostedReplyToAccount != nil {
		b, err := f.blockedDomain(r.BoostedReplyToAccount.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	for _, a := range r.BoostedMentionedAccounts {
		b, err := f.blockedDomain(a.Domain)
		if err != nil {
			return false, err
		}
		if b {
			return true, nil
		}
	}

	return false, nil
}