/**

* @file GitHub1s quickDiffProvider for pull/commit change files

* @author netcon

*/

import * as vscode from 'vscode';

import router from '@/router';

import { Repository } from '@/repository';

import { emptyFileUri } from '@/providers';

import adapterManager from '@/adapters/manager';

import * as adapterTypes from '@/adapters/types';

// get the original source uri when the `routerState.pageType` is `PageType.PULL`

const getOriginalResourceForPull = async (uri: vscode.Uri, codeReviewId: string): Promise<vscode.Uri | null> => {

const routeState = await router.getState();

const currentScheme = adapterManager.getCurrentScheme();

const repository = Repository.getInstance(currentScheme, routeState.repo);

const codeReviewFiles = await repository.getCodeReviewChangedFiles(codeReviewId);

const changedFile = codeReviewFiles?.find((changedFile) => changedFile.path === uri.path.slice(1));

if (

!changedFile ||

changedFile.status === adapterTypes.FileChangeStatus.Added ||

changedFile.status === adapterTypes.FileChangeStatus.Removed

) {

return null;

}

const codeReview = await repository.getCodeReviewItem(codeReviewId);

if (!codeReview?.targetSha) {

return null;

}

const originalAuthority = `${routeState.repo}+${codeReview!.targetSha}`;

const originalPath = changedFile.previousPath ? `/${changedFile.previousPath}` : uri.path;

return uri.with({ authority: originalAuthority, path: originalPath });

};

// get the original source uri when the `routerState.pageType` is `PageType.COMMIT`

const getOriginalResourceForCommit = async (uri: vscode.Uri, commitSha: string) => {

const routeState = await router.getState();

const currentScheme = adapterManager.getCurrentScheme();

const repository = Repository.getInstance(currentScheme, routeState.repo);

const commitFiles = await repository.getCommitChangedFiles(commitSha);

const changedFile = commitFiles?.find((changedFile) => changedFile.path === uri.path.slice(1));

if (

!changedFile ||

changedFile.status === adapterTypes.FileChangeStatus.Added ||

changedFile.status === adapterTypes.FileChangeStatus.Removed

) {

return null;

}

const commit = await repository.getCommitItem(commitSha);

const parentCommitSha = commit?.parents?.[0];

if (!parentCommitSha) {

return emptyFileUri;

}

const originalAuthority = `${routeState.repo}+${parentCommitSha}`;

const originalPath = changedFile.previousPath ? `/${changedFile.previousPath}` : uri.path;

return uri.with({ authority: originalAuthority, path: originalPath });

};

export class GitHub1sQuickDiffProvider implements vscode.QuickDiffProvider {

provideOriginalResource(uri: vscode.Uri, _token: vscode.CancellationToken): vscode.ProviderResult<vscode.Uri> {

if (uri.scheme !== adapterManager.getCurrentScheme()) {

return null;

}

return router.getState().then(async (routerState) => {

// only the file belong to current authority could be provided a quick diff

if (uri.authority && uri.authority !== (await router.getAuthority())) {

return null;

}

if (routerState.pageType === adapterTypes.PageType.CodeReview) {

return getOriginalResourceForPull(uri, routerState.codeReviewId);

}

if (routerState.pageType === adapterTypes.PageType.Commit) {

return getOriginalResourceForCommit(uri, routerState.commitSha);

}

return null;

});

}

}