"use strict";

const path = require("path");
const fs = require("fs");
const async = require("async");
const glob = require("glob");

const autoGeneratedMarker
    = "//------------------------------------------------------------------------------\n"
    + "// <auto-generated>";

module.exports = (params, processor) => ({
    "process": () => {
        if (processor.context.dotnetcheckerDone) {
            return processor.done();
        }

        processor.context.dotnetcheckerDone = true;

        return glob("**/*.cs", { "cwd": processor.context.exported }, (err, files) => {
            if (err) {
                processor.onError(err);

                return processor.done();
            }

            processor.onInfo(`Found ${files.length} .cs files`);

            if (!files || !files.length) {
                processor.onWarn("No .cs files found");

                return processor.done();
            }

            return async.parallel(files.map((file) => (callback) => fs.readFile(path.join(processor.context.exported, file), { "encoding": "utf8" }, (err, data) => {
                if (err) {
                    processor.onError(`Unable to check file ${file}: ${err}`);

                    return callback(err);
                }

                if (data.indexOf("\r\n") >= 0) {
                    processor.onError(`Windows-style EOL (0D0A) found in file ${file}`);

                    return callback();
                }

                if (params.ignoreCodeStyle) {
                    return callback();
                }

                if (
                    data.substr(1, autoGeneratedMarker.length) === autoGeneratedMarker
                    || data.substr(0, autoGeneratedMarker.length) === autoGeneratedMarker
                ) {
                    processor.onInfo(`Skipping auto-generated file ${file}`);

                    return callback();
                }

                if (data.indexOf("\t") >= 0 && data.indexOf("    ") >= 0) {
                    processor.onError(`Both tabs and spaces found in file ${file}`);
                }

                if (data.indexOf("\t") >= 0) {
                    processor.onError(`Tabs found in file ${file}`);
                }

                processor.onInfo(`Checked file ${file}`);

                return callback();
            })), processor.done.bind(processor));
        });
    }
});