import { createAction, createSlice } from '@reduxjs/toolkit';
import { memoizeWith } from '@shlinkio/data-manipulation';
import type { ShlinkHealth } from '@shlinkio/shlink-web-component/api-contract';
import { useCallback } from 'react';
import type { ShlinkApiClientBuilder } from '../../api/services/ShlinkApiClientBuilder';
import { useDependencies } from '../../container/context';
import { useAppDispatch, useAppSelector } from '../../store';
import { createAsyncThunk } from '../../store/helpers';
import { versionToPrintable, versionToSemVer as toSemVer } from '../../utils/helpers/version';
import type { SelectedServer, ServerWithId } from '../data';

const REDUCER_PREFIX = 'shlink/selectedServer';

export const MIN_FALLBACK_VERSION = '1.0.0';
export const MAX_FALLBACK_VERSION = '999.999.999';
export const LATEST_VERSION_CONSTRAINT = 'latest';

const versionToSemVer = (version: string) => toSemVer(
  version === LATEST_VERSION_CONSTRAINT ? MAX_FALLBACK_VERSION : version,
  MIN_FALLBACK_VERSION,
);

const getServerVersion = memoizeWith(
  (server: ServerWithId) => `${server.id}_${server.url}_${server.apiKey}`,
  async (_server: ServerWithId, health: () => Promise<ShlinkHealth>) => health().then(({ version }) => ({
    version: versionToSemVer(version),
    printableVersion: versionToPrintable(version),
  })),
);

const initialState: SelectedServer = null;

export const resetSelectedServer = createAction<void>(`${REDUCER_PREFIX}/resetSelectedServer`);

export type SelectServerOptions = {
  serverId: string;
  buildShlinkApiClient: ShlinkApiClientBuilder;
};

export const selectServer = createAsyncThunk(
  `${REDUCER_PREFIX}/selectServer`,
  async ({ serverId, buildShlinkApiClient }: SelectServerOptions, { dispatch, getState }): Promise<SelectedServer> => {
    dispatch(resetSelectedServer());

    const { servers } = getState();
    const selectedServer = servers[serverId];

    if (!selectedServer) {
      return { serverNotFound: true };
    }

    try {
      const apiClient = buildShlinkApiClient(selectedServer);
      const { version, printableVersion } = await getServerVersion(selectedServer, () => apiClient.health());

      return {
        ...selectedServer,
        version,
        printableVersion,
      };
    } catch {
      return { ...selectedServer, serverNotReachable: true };
    }
  },
);

export const { reducer: selectedServerReducer } = createSlice({
  name: REDUCER_PREFIX,
  initialState: initialState as SelectedServer,
  reducers: {},
  extraReducers: (builder) => {
    builder.addCase(resetSelectedServer, () => initialState);
    builder.addCase(selectServer.fulfilled, (_, { payload }) => payload);
  },
});

export const useSelectedServer = () => {
  const dispatch = useAppDispatch();
  const [buildShlinkApiClient] = useDependencies<[ShlinkApiClientBuilder]>('buildShlinkApiClient');
  const dispatchResetSelectedServer = useCallback(() => dispatch(resetSelectedServer()), [dispatch]);
  const dispatchSelectServer = useCallback(
    (serverId: string) => dispatch(selectServer({ serverId, buildShlinkApiClient })),
    [buildShlinkApiClient, dispatch],
  );
  const selectedServer = useAppSelector(({ selectedServer }) => selectedServer);

  return {
    selectedServer,
    resetSelectedServer: dispatchResetSelectedServer,
    selectServer: dispatchSelectServer,
  };
};