import { Chalk } from 'chalk';

import { exec } from 'child_process';

import * as util from 'util';

import { Config } from './config';

import { loadTheme } from './themes';

const execAsync = util.promisify(exec);

const GIT_CONFIG_KEY_PREFIX = 'split-diffs';

const GIT_CONFIG_LINE_REGEX = new RegExp(

`${GIT_CONFIG_KEY_PREFIX}\.([^=]+)=(.*)`

);

async function getRawGitConfig() {

const { stdout } = await execAsync('git config -l');

const rawConfig: Record<string, string> = {};

for (const line of stdout.trim().split('\n')) {

const match = line.match(GIT_CONFIG_LINE_REGEX);

if (!match) {

continue;

}

const [, key, value] = match;

rawConfig[key] = value;

}

return rawConfig;

}

// TODO: Make this less manual

export async function getGitConfig(

screenWidth: number,

chalk: Chalk

): Promise<Config> {

const rawConfig = await getRawGitConfig();

// Defaults to "dark"

const themeName = rawConfig['theme-name'] ?? 'dark';

const theme = loadTheme(themeName);

// Defaults to the theme's setting

const syntaxHighlightingTheme =

rawConfig['syntax-highlighting-theme'] ??

theme.SYNTAX_HIGHLIGHTING_THEME;

// Defaults to true

const wrapLines = rawConfig['wrap-lines'] === 'false' ? false : true;

// Defaults to true

const highlightLineChanges =

rawConfig['highlight-line-changes'] === 'false' ? false : true;

// Defaults to 80

let minLineWidth = 80;

try {

const parsedMinLineWidth = parseInt(rawConfig['min-line-width'], 10);

if (!isNaN(parsedMinLineWidth)) {

minLineWidth = parsedMinLineWidth;

}

} catch {}

return {

...theme,

CHALK: chalk,

SCREEN_WIDTH: screenWidth,

MIN_LINE_WIDTH: minLineWidth,

WRAP_LINES: wrapLines,

HIGHLIGHT_LINE_CHANGES: highlightLineChanges,

SYNTAX_HIGHLIGHTING_THEME: syntaxHighlightingTheme,

};

}