'use strict';

const split = require("split");
const through2 = require("through2");
const path = require("path");
const rightPad = require("right-pad");
const defaultValue = require("default-value");

let unfound = {};
let found = {};
let foundBase = {};
let probablyNotReallyMissing = {};
let ceaseProcessing = false;

let bannedPrefixes = [
    "/dev/",
    "/sys/",
    "/run/"
]

function isLibrary(name) {
    return (name.match(/\.so(?:\.[0-9]+)?$/) && !name.match(/\.so(?:\.[0-9]+)\.so$/));
}

function getLibraryName(name) {
    let match = /^(.+)\.so(?:\.[0-9]+)?$/.exec(name);

    if (match == null) {
        throw new Error(`Library name regex failed for library: ${name}`);
    } else {
        return match[1];
    }
}

process.stdin
    .pipe(split())
    .pipe(through2.obj(function(item, enc, cb) {
        if (item.trim().length === 0) {
            cb();
        } else {
            let match = /^\s*(?:\[pid\s*[0-9]+\] )?(?:open|stat)\("([^"]+)", ([A-Z_|]+|0x[0-9a-f]+|\{[^\}]+\})\) = (-?[0-9]+)(?: ([A-Z]+))?/.exec(item.toString());

            if (match != null) {
                let path = match[1];

                if (!bannedPrefixes.some(prefix => path.indexOf(prefix) === 0)) {
                    this.push({
                        path: match[1],
                        flags: match[2].split("|"),
                        status: parseInt(match[3]),
                        error: match[4]
                    });
                }
            }
            cb();
        }
    }))
    .pipe(through2.obj(function(item, enc, cb) {
        let basename = path.basename(item.path);

        if (basename === "gdb") {
            ceaseProcessing = true;
            found["-- GDB ENCOUNTERED --"] = "";
            unfound["-- GDB ENCOUNTERED --"] = "";
        }

        if (ceaseProcessing === false) {
            if (item.status === -1) {
                unfound[basename] = item.path;
            } else {
                delete unfound[basename];
                found[basename] = item.path;

                if (isLibrary(basename)) {
                    foundBase[getLibraryName(basename)] = item.path;
                }
            }
        }

        cb();
    }))
    .on("finish", () => {
        Object.keys(unfound).forEach((basename) => {
            function markNotMissing(reason) {
                delete unfound[basename];
                probablyNotReallyMissing[basename] = reason;
            }

            if (basename.match(/\.dll.so$/) && found[basename.slice(0, -3)]) {
                markNotMissing("mono: is actually a DLL");
            } else if (basename.match(/\.dll.so.la$/) && found[basename.slice(0, -6)]) {
                markNotMissing("mono: is actually a DLL");
            } else if (basename.match(/\.res(?:G|S)?$/)) {
                markNotMissing("unity: .res / .resG / .resS file");
            } else if (unfound[basename].match(/\/aot-cache\/[^\/]+\/[^\/]+$/)) {
                markNotMissing("mono: is an AOT cache path");
            } else if (isLibrary(basename) && foundBase[getLibraryName(basename)]) {
                markNotMissing("other library version was already found")
            }
        });

        function toArray(obj) {
            return Object.keys(obj).map((key) => {
                let value = obj[key];

                return {
                    basename: key,
                    path: value
                }
            });
        }


        let foundItems = toArray(found);
        let missingItems = toArray(unfound);
        let probablyNotReallyMissingItems = toArray(probablyNotReallyMissing);

        let missingLibraries = [];
        let missingOther = [];

        missingItems.forEach((item) => {
            if (isLibrary(item.basename)) {
                missingLibraries.push(item);
            } else {
                missingOther.push(item);
            }
        });

        function printCategory(name, items, options = {}) {
            let maxWidth = Math.max.apply(null, items.map(item => item.basename.length));
            let cutoff = defaultValue(options.cutoff, 30);
            let pathFormat = defaultValue(options.pathFormat, "%");

            console.log(`\n${name}:`);

            if (items.length === 0) {
                console.log("    (none)");
            } else {
                items.slice(0, cutoff).forEach((item) => {
                    console.log(`    ${rightPad(item.basename, maxWidth + 5)}${pathFormat.replace("%", item.path)}`);
                });

                if (items.length > cutoff) {
                    console.log(`    (... ${items.length - cutoff} more ...)`);
                }
            }
        }

        printCategory("Found", foundItems);

        printCategory("Probably found", probablyNotReallyMissingItems, {
            pathFormat: "reason: %"
        });

        printCategory("Missing miscellaneous", missingOther, {
            pathFormat: "(last attempted path: %)"
        });

        printCategory("MISSING LIBRARIES", missingLibraries, {
            pathFormat: "(last attempted path: %)"
        });
    })
    .pipe(process.stdout);