'use strict';
import { commands, TextEditor, Uri, window } from 'vscode';
import { GlyphChars } from '../constants';
import { Container } from '../container';
import { GitLog, GitUri } from '../git/gitService';
import { Logger } from '../logger';
import { Messages } from '../messages';
import { BranchesQuickPick, BranchHistoryQuickPick, CommandQuickPickItem } from '../quickpicks';
import { Strings } from '../system';
import { ActiveEditorCachedCommand, Commands, getCommandUri, getRepoPathOrActiveOrPrompt } from './common';
import { ShowQuickCommitDetailsCommandArgs } from './showQuickCommitDetails';

export interface ShowQuickBranchHistoryCommandArgs {
    branch?: string;
    log?: GitLog;
    maxCount?: number;
    repoPath?: string;

    goBackCommand?: CommandQuickPickItem;
    nextPageCommand?: CommandQuickPickItem;
}

export class ShowQuickBranchHistoryCommand extends ActiveEditorCachedCommand {
    constructor() {
        super(Commands.ShowQuickBranchHistory);
    }

    async execute(editor?: TextEditor, uri?: Uri, args: ShowQuickBranchHistoryCommandArgs = {}) {
        uri = getCommandUri(uri, editor);

        const gitUri = uri && (await GitUri.fromUri(uri));

        args = { ...args };

        let progressCancellation =
            args.branch === undefined ? undefined : BranchHistoryQuickPick.showProgress(args.branch);
        try {
            const repoPath =
                args.repoPath ||
                (await getRepoPathOrActiveOrPrompt(
                    gitUri,
                    editor,
                    `Show branch history in which repository${GlyphChars.Ellipsis}`
                ));
            if (!repoPath) return undefined;

            if (args.branch === undefined) {
                const branches = await Container.git.getBranches(repoPath);

                let goBackCommand;
                if (!(await Container.git.getRepoPathOrActive(uri, editor))) {
                    goBackCommand = new CommandQuickPickItem(
                        {
                            label: `go back ${GlyphChars.ArrowBack}`,
                            description: `${Strings.pad(GlyphChars.Dash, 2, 3)} to which repository`
                        },
                        Commands.ShowQuickBranchHistory,
                        [uri, args]
                    );
                }

                const pick = await BranchesQuickPick.show(branches, `Show history for branch${GlyphChars.Ellipsis}`, {
                    goBackCommand: goBackCommand
                });
                if (pick === undefined) return undefined;

                if (pick instanceof CommandQuickPickItem) return pick.execute();

                args.branch = pick.branch.name;
                if (args.branch === undefined) return undefined;

                progressCancellation = BranchHistoryQuickPick.showProgress(args.branch);
            }

            if (args.log === undefined) {
                args.log = await Container.git.getLog(repoPath, {
                    maxCount: args.maxCount,
                    ref: (gitUri && gitUri.sha) || args.branch
                });
                if (args.log === undefined) return window.showWarningMessage(`Unable to show branch history`);
            }

            if (progressCancellation !== undefined && progressCancellation.token.isCancellationRequested) {
                return undefined;
            }

            const pick = await BranchHistoryQuickPick.show(
                args.log,
                gitUri,
                args.branch,
                progressCancellation!,
                args.goBackCommand,
                args.nextPageCommand
            );
            if (pick === undefined) return undefined;

            if (pick instanceof CommandQuickPickItem) return pick.execute();

            // Create a command to get back to here
            const currentCommand = new CommandQuickPickItem(
                {
                    label: `go back ${GlyphChars.ArrowBack}`,
                    description: `${Strings.pad(GlyphChars.Dash, 2, 3)} to ${GlyphChars.Space}$(git-branch) ${
                        args.branch
                    } history`
                },
                Commands.ShowQuickBranchHistory,
                [uri, { ...args }]
            );

            return commands.executeCommand(Commands.ShowQuickCommitDetails, pick.commit.toGitUri(), {
                sha: pick.commit.sha,
                commit: pick.commit,
                repoLog: args.log,
                goBackCommand: currentCommand
            } as ShowQuickCommitDetailsCommandArgs);
        }
        catch (ex) {
            Logger.error(ex, 'ShowQuickBranchHistoryCommand');
            return Messages.showGenericErrorMessage('Unable to show branch history');
        }
        finally {
            progressCancellation && progressCancellation.cancel();
        }
    }
}