import _ from 'lodash';
import * as Diff from 'diff';
const getGitDiffsFromPatchText = (patchText) => {
    const lines = patchText.split("\n");
    const hunks = [];
    let previousHunk = -1;
    const filenameRegex = RegExp(/diff --git a\/(.*?) b\/(.*?)/);
    const lineNumberRegex = RegExp(/@@ -(.*?)[,| ].*/);
    let previousFilename = '';
    let currentFilename = '';
    let skipFourStartingAt = -1;
    lines.forEach((line, index) => {
        if (line.startsWith("diff")) {
            previousFilename = currentFilename;
            currentFilename = line.match(filenameRegex)[1];
            if (previousHunk !== -1) {
                skipFourStartingAt = index;
            }
        }
        if (line.startsWith("@@") || index == lines.length - 1) {
            if (previousHunk === -1) {
                previousHunk = index;
                return;
            }
            let hunkEndIndex = index + 1;
            if (skipFourStartingAt !== -1 && skipFourStartingAt < hunkEndIndex) {
                hunkEndIndex = skipFourStartingAt;
                skipFourStartingAt = -1;
            }
            const lastHunk = lines.slice(previousHunk, hunkEndIndex);
            let lastHunkBefore = lastHunk.filter(line => line.startsWith("-")).map(str => str.replace("-", "")).join("\n");
            let lastHunkAfter = lastHunk.filter(line => line.startsWith("+")).map(str => str.replace("+", "")).join("\n");
            lastHunkBefore = _.escape(lastHunkBefore);
            lastHunkAfter = _.escape(lastHunkAfter);
            const changeObject = Diff.diffWordsWithSpace(lastHunkBefore, lastHunkAfter);
            let previousText = "";
            let afterText = "";
            changeObject.forEach((obj) => {
                if (!obj.added && !obj.removed) {
                    previousText = previousText + obj.value;
                    afterText = afterText + obj.value;
                }
                if (obj.added) {
                    afterText = afterText + "<mark>" + obj.value + "</mark>";
                }
                if (obj.removed) {
                    previousText = previousText + "<mark>" + obj.value + "</mark>";
                }
            });
            hunks.push({
                file: previousFilename !== '' ? previousFilename : currentFilename,
                lineNumber: parseInt(lines[previousHunk].match(lineNumberRegex)[1]),
                previousText,
                afterText,
            });
            previousFilename = '';
            previousHunk = index;
        }
    });
    return hunks;
};
/** @hidden */
const getDarcsDiffsFromPatchText = (patchText) => {
    const lines = patchText.split("\n");
    const hunks = [];
    let previousHunk = -1;
    lines.forEach((line, index) => {
        if (line.startsWith("hunk") || index === lines.length - 1) {
            if (previousHunk === -1) {
                previousHunk = index;
                return;
            }
            // get diff from previous hunk to this next one
            const lastHunk = lines.slice(previousHunk, index + 1); // slice is non-inclusive for the end argument
            let lastHunkBefore = lastHunk.filter(line => line.startsWith("-")).map(str => str.replace("-", "")).join("\n");
            let lastHunkAfter = lastHunk.filter(line => line.startsWith("+")).map(str => str.replace("+", "")).join("\n");
            lastHunkBefore = _.escape(lastHunkBefore);
            lastHunkAfter = _.escape(lastHunkAfter);
            let filename = lines[previousHunk].replace("hunk ./", "");
            const changeObject = Diff.diffWords(lastHunkBefore, lastHunkAfter);
            let previousText = "";
            let afterText = "";
            changeObject.forEach((obj) => {
                if (!obj.added && !obj.removed) {
                    previousText = previousText + obj.value;
                    afterText = afterText + obj.value;
                }
                if (obj.added) {
                    afterText = afterText + "<mark>" + obj.value + "</mark>";
                }
                if (obj.removed) {
                    previousText = previousText + "<mark>" + obj.value + "</mark>";
                }
            });
            const regex = RegExp(/(.*) ([0-9]+)$/);
            const matches = filename.match(regex);
            const file = matches[1];
            const lineNumber = parseInt(matches[2]);
            hunks.push({
                file,
                lineNumber,
                previousText,
                afterText,
            });
            previousHunk = index;
        }
    });
    return hunks;
};
const getLocation = (reposConfig, branchName, repoName) => {
    const config = reposConfig.repos[repoName];
    if (config._type === "darcs") {
        return config.branches[branchName].location;
    }
    else if (config._type === "git") {
        return config.location;
    }
};
export { getDarcsDiffsFromPatchText, getGitDiffsFromPatchText, getLocation, };