/*
 * Vencord, a modification for Discord's desktop app
 * Copyright (c) 2022 Vendicated and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

// eslint-disable-next-line spaced-comment
/// <reference types="../src/globals" />
// eslint-disable-next-line spaced-comment
/// <reference types="../src/modules" />

import { readFileSync } from "fs";
import pup, { JSHandle } from "puppeteer-core";

for (const variable of ["DISCORD_TOKEN", "CHROMIUM_BIN"]) {
    if (!process.env[variable]) {
        console.error(`Missing environment variable ${variable}`);
        process.exit(1);
    }
}

const CANARY = process.env.USE_CANARY === "true";

const browser = await pup.launch({
    headless: "new",
    executablePath: process.env.CHROMIUM_BIN
});

const page = await browser.newPage();
await page.setUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36");

async function maybeGetError(handle: JSHandle): Promise<string | undefined> {
    return await (handle as JSHandle<Error>)?.getProperty("message")
        .then(m => m?.jsonValue());
}

const report = {
    badPatches: [] as {
        plugin: string;
        type: string;
        id: string;
        match: string;
        error?: string;
    }[],
    badStarts: [] as {
        plugin: string;
        error: string;
    }[],
    otherErrors: [] as string[],
    badWebpackFinds: [] as string[]
};

const IGNORED_DISCORD_ERRORS = [
    "KeybindStore: Looking for callback action",
    "Unable to process domain list delta: Client revision number is null",
    "Downloading the full bad domains file",
    /\[GatewaySocket\].{0,110}Cannot access '/,
    "search for 'name' in undefined",
    "Attempting to set fast connect zstd when unsupported"
] as Array<string | RegExp>;

function toCodeBlock(s: string) {
    s = s.replace(/```/g, "`\u200B`\u200B`");
    return "```" + s + " ```";
}

async function printReport() {
    console.log();

    console.log("# Vencord Report" + (CANARY ? " (Canary)" : ""));

    console.log();

    console.log("## Bad Patches");
    report.badPatches.forEach(p => {
        console.log(`- ${p.plugin} (${p.type})`);
        console.log(`  - ID: \`${p.id}\``);
        console.log(`  - Match: ${toCodeBlock(p.match)}`);
        if (p.error) console.log(`  - Error: ${toCodeBlock(p.error)}`);
    });

    console.log();

    console.log("## Bad Webpack Finds");
    report.badWebpackFinds.forEach(p => console.log("- " + p));

    console.log();

    console.log("## Bad Starts");
    report.badStarts.forEach(p => {
        console.log(`- ${p.plugin}`);
        console.log(`  - Error: ${toCodeBlock(p.error)}`);
    });

    console.log();

    const ignoredErrors = [] as string[];
    report.otherErrors = report.otherErrors.filter(e => {
        if (IGNORED_DISCORD_ERRORS.some(regex => e.match(regex))) {
            ignoredErrors.push(e);
            return false;
        }
        return true;
    });

    console.log("## Discord Errors");
    report.otherErrors.forEach(e => {
        console.log(`- ${toCodeBlock(e)}`);
    });

    console.log();

    console.log("## Ignored Discord Errors");
    ignoredErrors.forEach(e => {
        console.log(`- ${toCodeBlock(e)}`);
    });

    console.log();

    if (process.env.DISCORD_WEBHOOK) {
        await fetch(process.env.DISCORD_WEBHOOK, {
            method: "POST",
            headers: {
                "Content-Type": "application/json"
            },
            body: JSON.stringify({
                description: "Here's the latest Vencord Report!",
                username: "Vencord Reporter" + (CANARY ? " (Canary)" : ""),
                avatar_url: "https://cdn.discordapp.com/avatars/1017176847865352332/c312b6b44179ae6817de7e4b09e9c6af.webp?size=512",
                embeds: [
                    {
                        title: "Bad Patches",
                        description: report.badPatches.map(p => {
                            const lines = [
                                `**__${p.plugin} (${p.type}):__**`,
                                `ID: \`${p.id}\``,
                                `Match: ${toCodeBlock(p.match)}`
                            ];
                            if (p.error) lines.push(`Error: ${toCodeBlock(p.error)}`);
                            return lines.join("\n");
                        }).join("\n\n") || "None",
                        color: report.badPatches.length ? 0xff0000 : 0x00ff00
                    },
                    {
                        title: "Bad Webpack Finds",
                        description: report.badWebpackFinds.map(toCodeBlock).join("\n") || "None",
                        color: report.badWebpackFinds.length ? 0xff0000 : 0x00ff00
                    },
                    {
                        title: "Bad Starts",
                        description: report.badStarts.map(p => {
                            const lines = [
                                `**__${p.plugin}:__**`,
                                toCodeBlock(p.error)
                            ];
                            return lines.join("\n");
                        }
                        ).join("\n\n") || "None",
                        color: report.badStarts.length ? 0xff0000 : 0x00ff00
                    },
                    {
                        title: "Discord Errors",
                        description: report.otherErrors.length ? toCodeBlock(report.otherErrors.join("\n")) : "None",
                        color: report.otherErrors.length ? 0xff0000 : 0x00ff00
                    }
                ]
            })
        }).then(res => {
            if (!res.ok) console.error(`Webhook failed with status ${res.status}`);
            else console.error("Posted to Discord Webhook successfully");
        });
    }
}

page.on("console", async e => {
    const level = e.type();
    const rawArgs = e.args();

    const firstArg = await rawArgs[0]?.jsonValue();
    if (firstArg === "[PUPPETEER_TEST_DONE_SIGNAL]") {
        await browser.close();
        await printReport();
        process.exit();
    }

    const isVencord = firstArg === "[Vencord]";
    const isDebug = firstArg === "[PUP_DEBUG]";
    const isWebpackFindFail = firstArg === "[PUP_WEBPACK_FIND_FAIL]";

    if (isWebpackFindFail) {
        process.exitCode = 1;
        report.badWebpackFinds.push(await rawArgs[1].jsonValue() as string);
    }

    if (isVencord) {
        let args: unknown[] = [];
        try {
            args = await Promise.all(e.args().map(a => a.jsonValue()));
        } catch {
            return;
        }

        const [, tag, message] = args as Array<string>;
        const cause = await maybeGetError(e.args()[3]);

        switch (tag) {
            case "WebpackInterceptor:":
                const patchFailMatch = message.match(/Patch by (.+?) (had no effect|errored|found no module) \(Module id is (.+?)\): (.+)/)!;
                if (!patchFailMatch) break;

                process.exitCode = 1;

                const [, plugin, type, id, regex] = patchFailMatch;
                report.badPatches.push({
                    plugin,
                    type,
                    id,
                    match: regex.replace(/\[A-Za-z_\$\]\[\\w\$\]\*/g, "\\i"),
                    error: cause
                });

                break;
            case "PluginManager:":
                const failedToStartMatch = message.match(/Failed to start (.+)/);
                if (!failedToStartMatch) break;

                process.exitCode = 1;

                const [, name] = failedToStartMatch;
                report.badStarts.push({
                    plugin: name,
                    error: cause ?? "Unknown error"
                });

                break;
        }
    }

    async function getText() {
        try {
            return await Promise.all(
                e.args().map(async a => {
                    return await maybeGetError(a) || await a.jsonValue();
                })
            ).then(a => a.join(" ").trim());
        } catch {
            return e.text();
        }
    }

    if (isDebug) {
        const text = await getText();

        console.error(text);
        if (text.includes("A fatal error occurred:")) {
            process.exit(1);
        }
    } else if (level === "error") {
        const text = await getText();

        if (text.length && !text.startsWith("Failed to load resource: the server responded with a status of") && !text.includes("Webpack")) {
            console.error("[Unexpected Error]", text);
            report.otherErrors.push(text);
        }
    }
});

page.on("error", e => console.error("[Error]", e));
page.on("pageerror", e => console.error("[Page Error]", e));

await page.setBypassCSP(true);

async function reporterRuntime(token: string) {
    console.log("[PUP_DEBUG]", "Starting test...");

    try {
        // Spoof languages to not be suspicious
        Object.defineProperty(navigator, "languages", {
            get: function () {
                return ["en-US", "en"];
            }
        });

        // Enable eagerPatches to make all patches apply regardless of the module being required
        Vencord.Settings.eagerPatches = true;

        // The main patch for starting the reporter chunk loading
        Vencord.Plugins.addPatch({
            find: '"Could not find app-mount"',
            replacement: {
                match: /(?<="use strict";)/,
                replace: "Vencord.Webpack._initReporter();"
            }
        }, "Vencord Reporter");

        Vencord.Webpack.waitFor(
            Vencord.Webpack.filters.byProps("loginToken"),
            m => {
                console.log("[PUP_DEBUG]", "Logging in with token...");
                m.loginToken(token);
            }
        );

        // @ts-ignore
        Vencord.Webpack._initReporter = function () {
            // initReporter is called in the patched entry point of Discord
            // setImmediate to only start searching for lazy chunks after Discord initialized the app
            setTimeout(() => {
                console.log("[PUP_DEBUG]", "Loading all chunks...");

                Vencord.Webpack.factoryListeners.add(factory => {
                    // setImmediate to avoid blocking the factory patching execution while checking for lazy chunks
                    setTimeout(() => {
                        let isResolved = false;
                        searchAndLoadLazyChunks(String(factory))
                            .then(() => isResolved = true)
                            .catch(() => isResolved = true);

                        chunksSearchPromises.push(() => isResolved);
                    }, 0);
                });

                for (const factoryId in wreq.m) {
                    let isResolved = false;
                    searchAndLoadLazyChunks(String(wreq.m[factoryId]))
                        .then(() => isResolved = true)
                        .catch(() => isResolved = true);

                    chunksSearchPromises.push(() => isResolved);
                }
            }, 0);
        };

        const wreq = Vencord.Util.proxyLazy(() => Vencord.Webpack.wreq);
        const { canonicalizeMatch, Logger } = Vencord.Util;

        const validChunks = new Set<string>();
        const invalidChunks = new Set<string>();
        const deferredRequires = new Set<string>();

        let chunksSearchingResolve: (value: void | PromiseLike<void>) => void;
        const chunksSearchingDone = new Promise<void>(r => chunksSearchingResolve = r);

        // True if resolved, false otherwise
        const chunksSearchPromises = [] as Array<() => boolean>;

        const LazyChunkRegex = canonicalizeMatch(/(?:(?:Promise\.all\(\[)?(\i\.e\("[^)]+?"\)[^\]]*?)(?:\]\))?)\.then\(\i\.bind\(\i,"([^)]+?)"\)\)/g);

        async function searchAndLoadLazyChunks(factoryCode: string) {
            const lazyChunks = factoryCode.matchAll(LazyChunkRegex);
            const validChunkGroups = new Set<[chunkIds: string[], entryPoint: string]>();

            // Workaround for a chunk that depends on the ChannelMessage component but may be be force loaded before
            // the chunk containing the component
            const shouldForceDefer = factoryCode.includes(".Messages.GUILD_FEED_UNFEATURE_BUTTON_TEXT");

            await Promise.all(Array.from(lazyChunks).map(async ([, rawChunkIds, entryPoint]) => {
                const chunkIds = rawChunkIds ? Array.from(rawChunkIds.matchAll(Vencord.Webpack.ChunkIdsRegex)).map(m => m[1]) : [];

                if (chunkIds.length === 0) {
                    return;
                }

                let invalidChunkGroup = false;

                for (const id of chunkIds) {
                    if (wreq.u(id) == null || wreq.u(id) === "undefined.js") continue;

                    const isWasm = await fetch(wreq.p + wreq.u(id))
                        .then(r => r.text())
                        .then(t => t.includes(".module.wasm") || !t.includes("(this.webpackChunkdiscord_app=this.webpackChunkdiscord_app||[]).push"));

                    if (isWasm) {
                        invalidChunks.add(id);
                        invalidChunkGroup = true;
                        continue;
                    }

                    validChunks.add(id);
                }

                if (!invalidChunkGroup) {
                    validChunkGroups.add([chunkIds, entryPoint]);
                }
            }));

            // Loads all found valid chunk groups
            await Promise.all(
                Array.from(validChunkGroups)
                    .map(([chunkIds]) =>
                        Promise.all(chunkIds.map(id => wreq.e(id)))
                    )
            );

            // Requires the entry points for all valid chunk groups
            for (const [, entryPoint] of validChunkGroups) {
                try {
                    if (shouldForceDefer) {
                        deferredRequires.add(entryPoint);
                        continue;
                    }

                    if (wreq.m[entryPoint]) wreq(entryPoint);
                } catch (err) {
                    console.error(err);
                }
            }

            // setImmediate to only check if all chunks were loaded after this function resolves
            // We check if all chunks were loaded every time a factory is loaded
            // If we are still looking for chunks in the other factories, the array will have that factory's chunk search promise not resolved
            // But, if all chunk search promises are resolved, this means we found every lazy chunk loaded by Discord code and manually loaded them
            setTimeout(() => {
                let allResolved = true;

                for (let i = 0; i < chunksSearchPromises.length; i++) {
                    const isResolved = chunksSearchPromises[i]();

                    if (isResolved) {
                        // Remove finished promises to avoid having to iterate through a huge array everytime
                        chunksSearchPromises.splice(i--, 1);
                    } else {
                        allResolved = false;
                    }
                }

                if (allResolved) chunksSearchingResolve();
            }, 0);
        }

        await chunksSearchingDone;

        // Require deferred entry points
        for (const deferredRequire of deferredRequires) {
            wreq(deferredRequire);
        }

        // All chunks Discord has mapped to asset files, even if they are not used anymore
        const allChunks = [] as string[];

        // Matches "id" or id:
        for (const currentMatch of String(wreq.u).matchAll(/(?:"(\d+?)")|(?:(\d+?):)/g)) {
            const id = currentMatch[1] ?? currentMatch[2];
            if (id == null) continue;

            allChunks.push(id);
        }

        if (allChunks.length === 0) throw new Error("Failed to get all chunks");

        // Chunks that are not loaded (not used) by Discord code anymore
        const chunksLeft = allChunks.filter(id => {
            return !(validChunks.has(id) || invalidChunks.has(id));
        });

        await Promise.all(chunksLeft.map(async id => {
            const isWasm = await fetch(wreq.p + wreq.u(id))
                .then(r => r.text())
                .then(t => t.includes(".module.wasm") || !t.includes("(this.webpackChunkdiscord_app=this.webpackChunkdiscord_app||[]).push"));

            // Loads and requires a chunk
            if (!isWasm) {
                await wreq.e(id);
                if (wreq.m[id]) wreq(id);
            }
        }));

        console.log("[PUP_DEBUG]", "Finished loading all chunks!");

        for (const patch of Vencord.Plugins.patches) {
            if (!patch.all) {
                new Logger("WebpackInterceptor").warn(`Patch by ${patch.plugin} found no module (Module id is -): ${patch.find}`);
            }
        }

        await Promise.all(Vencord.Webpack.webpackSearchHistory.map(async ([searchType, args]) => {
            args = [...args];

            try {
                let result = null as any;

                switch (searchType) {
                    case "webpackDependantLazy":
                    case "webpackDependantLazyComponent": {
                        const [factory] = args;
                        result = factory();
                        break;
                    }
                    case "extractAndLoadChunks": {
                        const [code, matcher] = args;

                        result = await Vencord.Webpack.extractAndLoadChunks(code, matcher);
                        if (result === false) {
                            result = null;
                        }

                        break;
                    }
                    default: {
                        const findResult = args.shift();

                        if (findResult != null) {
                            if (findResult.$$vencordCallbackCalled != null && findResult.$$vencordCallbackCalled()) {
                                result = findResult;
                            }

                            if (findResult[Vencord.Util.SYM_PROXY_INNER_GET] != null) {
                                result = findResult[Vencord.Util.SYM_PROXY_INNER_VALUE];
                            }

                            if (findResult.$$vencordInner != null) {
                                result = findResult.$$vencordInner();
                            }
                        }

                        break;
                    }
                }

                if (result == null) {
                    throw "a rock at ben shapiro";
                }
            } catch (e) {
                let logMessage = searchType;

                let filterName = "";
                let parsedArgs = args;

                if (args[0].$$vencordProps != null) {
                    if (["find", "findComponent", "waitFor"].includes(searchType)) {
                        filterName = args[0].$$vencordProps[0];
                    }

                    parsedArgs = args[0].$$vencordProps.slice(1);
                }

                // if parsedArgs is the same as args, it means vencordProps of the filter was not available (like in normal filter functions),
                // so log the filter function instead
                if (
                    parsedArgs === args &&
                    ["waitFor", "find", "findComponent", "webpackDependantLazy", "webpackDependantLazyComponent"].includes(searchType)
                ) {
                    let filter = String(parsedArgs[0]);
                    if (filter.length > 150) {
                        filter = filter.slice(0, 147) + "...";
                    }

                    logMessage += `(${filter})`;
                } else if (searchType === "extractAndLoadChunks") {
                    let regexStr: string;
                    if (parsedArgs[1] === Vencord.Webpack.DefaultExtractAndLoadChunksRegex) {
                        regexStr = "DefaultExtractAndLoadChunksRegex";
                    } else {
                        regexStr = String(parsedArgs[1]);
                    }

                    logMessage += `([${parsedArgs[0].map((arg: any) => `"${arg}"`).join(", ")}], ${regexStr})`;
                } else {
                    logMessage += `(${filterName.length ? `${filterName}(` : ""}${parsedArgs.map(arg => `"${arg}"`).join(", ")})${filterName.length ? ")" : ""}`;
                }

                console.log("[PUP_WEBPACK_FIND_FAIL]", logMessage);
            }
        }));

        setTimeout(() => console.log("[PUPPETEER_TEST_DONE_SIGNAL]"), 1000);
    } catch (e) {
        console.log("[PUP_DEBUG]", "A fatal error occurred:", e);
    }
}

await page.evaluateOnNewDocument(`
    if (location.host.endsWith("discord.com")) {
        ${readFileSync("./dist/browser.js", "utf-8")};
        (${reporterRuntime.toString()})(${JSON.stringify(process.env.DISCORD_TOKEN)});
    }
`);

await page.goto(CANARY ? "https://canary.discord.com/login" : "https://discord.com/login");