import { __, n__ } from '~/locale';
import {
  PARALLEL_DIFF_VIEW_TYPE,
  INLINE_DIFF_VIEW_TYPE,
  INLINE_DIFF_LINES_KEY,
} from '../constants';
import { computeSuggestionCommitMessage } from '../utils/suggestions';
import { parallelizeDiffLines } from './utils';

export * from './getters_versions_dropdowns';

export const isParallelView = (state) => state.diffViewType === PARALLEL_DIFF_VIEW_TYPE;

export const isInlineView = (state) => state.diffViewType === INLINE_DIFF_VIEW_TYPE;

export const whichCollapsedTypes = (state) => {
  const automatic = state.diffFiles.some((file) => file.viewer?.automaticallyCollapsed);
  const manual = state.diffFiles.some((file) => file.viewer?.manuallyCollapsed);

  return {
    any: automatic || manual,
    automatic,
    manual,
  };
};

export const commitId = (state) => (state.commit && state.commit.id ? state.commit.id : null);

/**
 * Checks if the diff has all discussions expanded
 * @param {Object} diff
 * @returns {Boolean}
 */
export const diffHasAllExpandedDiscussions = (state, getters) => (diff) => {
  const discussions = getters.getDiffFileDiscussions(diff);

  return (
    (discussions && discussions.length && discussions.every((discussion) => discussion.expanded)) ||
    false
  );
};

/**
 * Checks if the diff has all discussions collapsed
 * @param {Object} diff
 * @returns {Boolean}
 */
export const diffHasAllCollapsedDiscussions = (state, getters) => (diff) => {
  const discussions = getters.getDiffFileDiscussions(diff);

  return (
    (discussions &&
      discussions.length &&
      discussions.every((discussion) => !discussion.expanded)) ||
    false
  );
};

/**
 * Checks if the diff has any open discussions
 * @param {Object} diff
 * @returns {Boolean}
 */
export const diffHasExpandedDiscussions = () => (diff) => {
  return diff[INLINE_DIFF_LINES_KEY].filter((l) => l.discussions.length >= 1).some(
    (l) => l.discussionsExpanded,
  );
};

/**
 * Checks if the diff has any discussion
 * @param {Boolean} diff
 * @returns {Boolean}
 */
export const diffHasDiscussions = () => (diff) => {
  return diff[INLINE_DIFF_LINES_KEY].some((l) => l.discussions.length >= 1);
};

/**
 * Returns an array with the discussions of the given diff
 * @param {Object} diff
 * @returns {Array}
 */
export const getDiffFileDiscussions = (state, getters, rootState, rootGetters) => (diff) =>
  rootGetters.discussions.filter(
    (discussion) => discussion.diff_discussion && discussion.diff_file.file_hash === diff.file_hash,
  ) || [];

export const getDiffFileByHash = (state) => (fileHash) =>
  state.diffFiles.find((file) => file.file_hash === fileHash);

export const flatBlobsList = (state) =>
  Object.values(state.treeEntries).filter((f) => f.type === 'blob');

export const allBlobs = (state, getters) =>
  getters.flatBlobsList.reduce((acc, file) => {
    const { parentPath } = file;

    if (parentPath && !acc.some((f) => f.path === parentPath)) {
      acc.push({
        path: parentPath,
        isHeader: true,
        tree: [],
      });
    }

    acc.find((f) => f.path === parentPath).tree.push(file);

    return acc;
  }, []);

export const getCommentFormForDiffFile = (state) => (fileHash) =>
  state.commentForms.find((form) => form.fileHash === fileHash);

/**
 * Returns the test coverage hits for a specific line of a given file
 * @param {string} file
 * @param {number} line
 * @returns {number}
 */
export const fileLineCoverage = (state) => (file, line) => {
  if (!state.coverageFiles.files) return {};
  const fileCoverage = state.coverageFiles.files[file];
  if (!fileCoverage) return {};
  const lineCoverage = fileCoverage[String(line)];

  if (lineCoverage === 0) {
    return { text: __('No test coverage'), class: 'no-coverage' };
  } else if (lineCoverage >= 0) {
    return {
      text: n__('Test coverage: %d hit', 'Test coverage: %d hits', lineCoverage),
      class: 'coverage',
    };
  }
  return {};
};

/**
 * Returns index of a currently selected diff in diffFiles
 * @returns {number}
 */
export const currentDiffIndex = (state) =>
  Math.max(
    0,
    state.diffFiles.findIndex((diff) => diff.file_hash === state.currentDiffFileId),
  );

export const diffLines = (state) => (file, unifiedDiffComponents) => {
  if (!unifiedDiffComponents && state.diffViewType === INLINE_DIFF_VIEW_TYPE) {
    return null;
  }

  return parallelizeDiffLines(
    file.highlighted_diff_lines || [],
    state.diffViewType === INLINE_DIFF_VIEW_TYPE,
  );
};

export function suggestionCommitMessage(state, _, rootState) {
  return (values = {}) =>
    computeSuggestionCommitMessage({
      message: state.defaultSuggestionCommitMessage,
      values: {
        branch_name: rootState.page.mrMetadata.branch_name,
        project_path: rootState.page.mrMetadata.project_path,
        project_name: rootState.page.mrMetadata.project_name,
        username: rootState.page.mrMetadata.username,
        user_full_name: rootState.page.mrMetadata.user_full_name,
        ...values,
      },
    });
}

export const isVirtualScrollingEnabled = (state) =>
  !state.viewDiffsFileByFile && window.gon?.features?.diffsVirtualScrolling;