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import { useQuery } from '@tanstack/react-query';
import { graphqlRequest } from '@/gql/graphql';
import { useTranslation } from 'react-i18next';
import { useSelectedProjectId } from '@/stores/projectStore';
import { useErrorHandler } from '@/hooks/use-error-handler';
import { ThreadConnection, ThreadDetail, threadConnectionSchema, threadDetailSchema } from './schema';

type ThreadOrderField = 'CREATED_AT' | 'UPDATED_AT';

type OrderDirection = 'ASC' | 'DESC';

type ThreadOrder = {
  field: ThreadOrderField;
  direction: OrderDirection;
};

type ThreadWhereInput = {
  projectID?: string;
  threadID?: string;
  threadIDContains?: string;
  [key: string]: unknown;
};

function buildThreadsQuery() {
  return `

    query GetThreads(

      $first: Int

      $after: Cursor

      $orderBy: ThreadOrder

      $where: ThreadWhereInput

    ) {

      threads(first: $first, after: $after, orderBy: $orderBy, where: $where) {

        edges {

          node {

            id

            threadID

            createdAt

            updatedAt

            project {

              id

              name

            }

            tracesSummary: traces(first: 1) {

              totalCount

            }

            firstUserQuery

          }

          cursor

        }

        pageInfo {

          hasNextPage

          hasPreviousPage

          startCursor

          endCursor

        }

        totalCount

      }

    }

  `;
}

function buildThreadDetailQuery() {
  return `

    query GetThreadDetail(

      $id: ID!

      $tracesFirst: Int

      $tracesAfter: Cursor

      $traceOrderBy: TraceOrder

    ) {

      node(id: $id) {

        ... on Thread {

          id

          threadID

          createdAt

          updatedAt

          usageMetadata {

            totalInputTokens

            totalOutputTokens

            totalTokens

            totalCost

            totalCachedTokens

            totalCachedWriteTokens

          }

          project {

            id

            name

          }

          tracesSummary: traces(first: 1) {

            totalCount

          }

          tracesConnection: traces(first: $tracesFirst, after: $tracesAfter, orderBy: $traceOrderBy) {

            edges {

              node {

                id

                traceID

                createdAt

                updatedAt

                project {

                  id

                  name

                }

                thread {

                  id

                  threadID

                }

                requests(where: { status: completed }) {

                  totalCount

                }

                firstUserQuery

                firstText

              }

              cursor

            }

            pageInfo {

              hasNextPage

              hasPreviousPage

              startCursor

              endCursor

            }

            totalCount

          }

        }

      }

    }

  `;
}

export function useThreads(variables?: { first?: number; after?: string; orderBy?: ThreadOrder; where?: ThreadWhereInput }) {
  const { t } = useTranslation();
  const { handleError } = useErrorHandler();
  const selectedProjectId = useSelectedProjectId();

  return useQuery<ThreadConnection>({
    queryKey: ['threads', variables, selectedProjectId],
    queryFn: async () => {
      try {
        const query = buildThreadsQuery();
        const headers = selectedProjectId ? { 'X-Project-ID': selectedProjectId } : undefined;
        const finalVariables = {
          ...variables,
          where: {
            ...variables?.where,
            ...(selectedProjectId && { projectID: selectedProjectId }),
          },
        };

        const data = await graphqlRequest<{ threads: ThreadConnection }>(query, finalVariables, headers);
        return threadConnectionSchema.parse(data?.threads);
      } catch (error) {
        handleError(error, t('threads.errors.fetchList'));
        throw error;
      }
    },
    enabled: true,
  });
}

export function useThreadDetail({

  id,

  tracesFirst,

  tracesAfter,

  traceOrderBy,

}: {

  id: string;

  tracesFirst?: number;

  tracesAfter?: string;

  traceOrderBy?: {

    field: 'CREATED_AT';

    direction: OrderDirection;

  };

}) {
  const { t } = useTranslation();
  const { handleError } = useErrorHandler();
  const selectedProjectId = useSelectedProjectId();

  return useQuery<ThreadDetail>({
    queryKey: ['thread-detail', id, tracesFirst, tracesAfter, traceOrderBy, selectedProjectId],
    queryFn: async () => {
      try {
        const query = buildThreadDetailQuery();
        const headers = selectedProjectId ? { 'X-Project-ID': selectedProjectId } : undefined;

        const variables = {
          id,
          tracesFirst,
          tracesAfter,
          traceOrderBy,
        };

        const data = await graphqlRequest<{ node?: ThreadDetail | null }>(query, variables, headers);
        if (!data?.node) {
          throw new Error(t('threads.errors.notFound'));
        }

        return threadDetailSchema.parse(data.node);
      } catch (error) {
        handleError(error, t('threads.errors.fetchDetail'));
        throw error;
      }
    },
    enabled: !!id,
  });
}