/*
 * MIT License
 *
 * Copyright (c) 2020-present Cloudogu GmbH and Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
import {
  Branch,
  BranchCollection,
  BranchCreation,
  BranchDetailsCollection,
  Link,
  Repository
} from "@scm-manager/ui-types";
import { requiredLink } from "./links";
import { useInfiniteQuery, useMutation, useQuery, useQueryClient } from "react-query";
import { ApiResult, ApiResultWithFetching } from "./base";
import { branchQueryKey, repoQueryKey } from "./keys";
import { apiClient } from "./apiclient";
import { concat } from "./urls";
import { useEffect } from "react";

export const useBranches = (repository: Repository): ApiResult<BranchCollection> => {
  const queryClient = useQueryClient();
  const link = requiredLink(repository, "branches");
  return useQuery<BranchCollection, Error>(
    repoQueryKey(repository, "branches"),
    () => apiClient.get(link).then(response => response.json()),
    {
      onSuccess: () => {
        return queryClient.invalidateQueries(branchQueryKey(repository, "details"));
      }
    }
    // we do not populate the cache for a single branch,
    // because we have no pagination for branches and if we have a lot of them
    // the population slows us down
  );
};

export const useBranch = (repository: Repository, name: string): ApiResultWithFetching<Branch> => {
  const link = requiredLink(repository, "branches");
  return useQuery<Branch, Error>(branchQueryKey(repository, name), () =>
    apiClient.get(concat(link, encodeURIComponent(name))).then(response => response.json())
  );
};

export const useBranchDetails = (repository: Repository, branch: string) => {
  const link = requiredLink(repository, "branchDetails");
  return useQuery<Branch, Error>(branchQueryKey(repository, branch, "details"), () =>
    apiClient.get(concat(link, encodeURIComponent(branch))).then(response => response.json())
  );
};

function chunkBranches(branches: Branch[]) {
  const chunks: Branch[][] = [];
  const chunkSize = 5;
  let chunkIndex = 0;
  for (const branch of branches) {
    if (!chunks[chunkIndex]) {
      chunks[chunkIndex] = [];
    }
    chunks[chunkIndex].push(branch);
    if (chunks[chunkIndex].length >= chunkSize) {
      chunkIndex = chunkIndex + 1;
    }
  }
  return chunks;
}

export const useBranchDetailsCollection = (repository: Repository, branches: Branch[]) => {
  const link = requiredLink(repository, "branchDetailsCollection");
  const chunks = chunkBranches(branches);

  const { data, isLoading, error, fetchNextPage } = useInfiniteQuery<
    BranchDetailsCollection,
    Error,
    BranchDetailsCollection
  >(
    branchQueryKey(repository, "details"),
    ({ pageParam = 0 }) => {
      const encodedBranches = chunks[pageParam]?.map(b => encodeURIComponent(b.name)).join("&branches=");
      return apiClient.get(concat(link, `?branches=${encodedBranches}`)).then(response => response.json());
    },
    {
      getNextPageParam: (lastPage, allPages) => {
        if (allPages.length >= chunks.length) {
          return undefined;
        }
        return allPages.length;
      }
    }
  );

  useEffect(() => {
    fetchNextPage();
  }, [data, fetchNextPage]);

  return {
    data: data?.pages?.map(d => d._embedded?.branchDetails).flat(1),
    isLoading,
    error
  };
};

const createBranch = (link: string) => {
  return (branch: BranchCreation) => {
    return apiClient
      .post(link, branch, "application/vnd.scmm-branchRequest+json;v=2")
      .then(response => {
        const location = response.headers.get("Location");
        if (!location) {
          throw new Error("Server does not return required Location header");
        }
        return apiClient.get(location);
      })
      .then(response => response.json());
  };
};

export const useCreateBranch = (repository: Repository) => {
  const queryClient = useQueryClient();
  const link = requiredLink(repository, "branches");
  const { mutate, isLoading, error, data } = useMutation<Branch, Error, BranchCreation>(createBranch(link), {
    onSuccess: async branch => {
      queryClient.setQueryData(branchQueryKey(repository, branch), branch);
      await queryClient.invalidateQueries(repoQueryKey(repository, "branches"));
    }
  });
  return {
    create: (branch: BranchCreation) => mutate(branch),
    isLoading,
    error,
    branch: data
  };
};

export const useDeleteBranch = (repository: Repository) => {
  const queryClient = useQueryClient();
  const { mutate, isLoading, error, data } = useMutation<unknown, Error, Branch>(
    branch => {
      const deleteUrl = (branch._links.delete as Link).href;
      return apiClient.delete(deleteUrl);
    },
    {
      onSuccess: async (_, branch) => {
        queryClient.removeQueries(branchQueryKey(repository, branch));
        await queryClient.invalidateQueries(repoQueryKey(repository, "branches"));
      }
    }
  );
  return {
    remove: (branch: Branch) => mutate(branch),
    isLoading,
    error,
    isDeleted: !!data
  };
};

type DefaultBranch = { defaultBranch: string };

export const useDefaultBranch = (repository: Repository): ApiResult<DefaultBranch> => {
  const link = requiredLink(repository, "defaultBranch");
  return useQuery<DefaultBranch, Error>(branchQueryKey(repository, "__default-branch"), () =>
    apiClient.get(link).then(response => response.json())
  );
};