package v1

import (
	"context"

	"github.com/pkg/errors"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"

	"github.com/usememos/memos/internal/webhook"
	v1pb "github.com/usememos/memos/proto/gen/api/v1"
	"github.com/usememos/memos/server/access"
	"github.com/usememos/memos/server/auth"
	"github.com/usememos/memos/store"
)

// DispatchMemoCreatedWebhook dispatches a webhook when a memo is created.
func (s *APIV1Service) DispatchMemoCreatedWebhook(ctx context.Context, memo *v1pb.Memo) error {
	return s.dispatchMemoRelatedWebhook(ctx, memo, "memos.memo.created")
}

// DispatchMemoUpdatedWebhook dispatches webhook when memo is updated.
func (s *APIV1Service) DispatchMemoUpdatedWebhook(ctx context.Context, memo *v1pb.Memo) error {
	return s.dispatchMemoRelatedWebhook(ctx, memo, "memos.memo.updated")
}

// DispatchMemoDeletedWebhook dispatches webhook when memo is deleted.
func (s *APIV1Service) DispatchMemoDeletedWebhook(ctx context.Context, memo *v1pb.Memo) error {
	return s.dispatchMemoRelatedWebhook(ctx, memo, "memos.memo.deleted")
}

// DispatchMemoCommentCreatedWebhook dispatches webhook to the related memo owner when a comment is created.
func (s *APIV1Service) DispatchMemoCommentCreatedWebhook(
	ctx context.Context,
	comment, relatedMemo *store.Memo,
	relatedMemoCreatorID int32,
) error {
	receiver, err := s.Store.GetUser(ctx, &store.FindUser{ID: &relatedMemoCreatorID})
	if err != nil {
		return err
	}
	if receiver == nil || receiver.RowStatus != store.Normal {
		return nil
	}
	for _, subject := range []*store.Memo{comment, relatedMemo} {
		readContext, err := s.buildMemoReadContextForViewer(ctx, subject, receiver, false, nil)
		if err != nil {
			return errors.Wrap(err, "failed to resolve webhook subject access")
		}
		decision := access.CheckMemoReadContext(readContext)
		if !decision.Allowed() {
			return nil
		}
	}
	// The request context belongs to the comment author, but the webhook belongs
	// to the context memo's author. Build the prepared payload under the receiver's
	// identity before it enters the existing asynchronous delivery queue.
	receiverCtx := auth.SetUserInContext(ctx, receiver, "")
	reactions, err := s.Store.ListReactions(receiverCtx, &store.FindReaction{MemoID: &comment.ID})
	if err != nil {
		return err
	}
	attachments, err := s.Store.ListAttachments(receiverCtx, &store.FindAttachment{MemoID: &comment.ID})
	if err != nil {
		return err
	}
	relations, err := s.loadMemoRelations(receiverCtx, comment)
	if err != nil {
		return err
	}
	commentMessage, err := s.convertMemoFromStore(receiverCtx, comment, reactions, attachments, relations)
	if err != nil {
		return err
	}
	webhooks, err := s.Store.GetUserWebhooks(ctx, relatedMemoCreatorID)
	if err != nil {
		return err
	}
	for _, hook := range webhooks {
		payload, err := convertMemoToWebhookPayload(commentMessage)
		if err != nil {
			return errors.Wrap(err, "failed to convert memo to webhook payload")
		}
		payload.ActivityType = "memos.memo.comment.created"
		payload.URL = hook.Url
		payload.SigningSecret = hook.SigningSecret
		webhook.PostAsync(payload)
	}
	return nil
}

func (s *APIV1Service) dispatchMemoRelatedWebhook(ctx context.Context, memo *v1pb.Memo, activityType string) error {
	creator, err := ResolveUserByName(ctx, s.Store, memo.Creator)
	if err != nil {
		return status.Errorf(codes.InvalidArgument, "invalid memo creator")
	}
	if creator == nil {
		return status.Errorf(codes.NotFound, "memo creator not found")
	}
	creatorID := creator.ID
	webhooks, err := s.Store.GetUserWebhooks(ctx, creatorID)
	if err != nil {
		return err
	}
	for _, hook := range webhooks {
		payload, err := convertMemoToWebhookPayload(memo)
		if err != nil {
			return errors.Wrap(err, "failed to convert memo to webhook payload")
		}
		payload.ActivityType = activityType
		payload.URL = hook.Url
		payload.SigningSecret = hook.SigningSecret
		webhook.PostAsync(payload)
	}
	return nil
}

func convertMemoToWebhookPayload(memo *v1pb.Memo) (*webhook.WebhookRequestPayload, error) {
	return &webhook.WebhookRequestPayload{
		Creator: memo.Creator,
		Memo:    memo,
	}, nil
}

func (s *APIV1Service) getMemoContentSnippet(content string) (string, error) {
	// Use goldmark service for snippet generation
	snippet, err := s.MarkdownService.GenerateSnippet([]byte(content), 64)
	if err != nil {
		return "", errors.Wrap(err, "failed to generate snippet")
	}
	return snippet, nil
}

// parseMemoOrderBy parses the order_by field and sets the appropriate ordering in memoFind.
// Follows AIP-132: supports comma-separated list of fields with optional "desc" suffix.
// Example: "pinned desc, create_time desc" or "update_time asc".