function main(stage, parameters) {
    const redirectHost = parameters.redirectHost || "http://127.0.0.1:8899";

    const setUrl = Resolve.Method("UnityEngine.UnityWebRequestModule.dll", "UnityEngine.Networking", "UnityWebRequest", "set_url", 1);
    const uriCtor = Resolve.Method("System.dll", "System", "Uri", ".ctor", 1);

    if (setUrl) Interceptor.attach(setUrl, new UrlRewriter(redirectHost));
    if (uriCtor) Interceptor.attach(uriCtor, new UrlRewriter(redirectHost));

    const browserLoad = Resolve.Method("ZFBrowser.dll", "ZenFulcrum.EmbeddedBrowser", "Browser", "LoadURL", 2);
    if (browserLoad) {
        Interceptor.attach(browserLoad, {
            onEnter(args) {
                const url = args[1].readManagedString();
                const prefix = url.split('/', 3).join('/');
                args[1] = Il2Cpp.NewString(url.replace(prefix, redirectHost));
            }
        });
    }

    console.log("[Yuanshen] dispatch redirect active -> " + redirectHost);

    if (parameters.levelProbe === true) attachLevelProbe();
    if (parameters.debugMenu !== false) enableDebugMenu();
}

const GlobalVars = {
    cctor: 0x4BE8CA0,
    typeInfo: 0xBE814B8,
    staticFields: 0xA0,
    debugMenu: 0xF8
};

function enableDebugMenu() {
    const base = Module.findBaseAddress("UserAssembly.dll");
    if (base === null) {
        console.log("[Yuanshen] debug menu: UserAssembly.dll not loaded");
        return;
    }

    Interceptor.attach(base.add(GlobalVars.cctor), {
        onLeave() {
            const klass = base.add(GlobalVars.typeInfo).readPointer();
            if (klass.isNull()) return;

            const statics = klass.add(GlobalVars.staticFields).readPointer();
            if (statics.isNull()) return;

            statics.add(GlobalVars.debugMenu).writeU8(1);
            console.log("[Yuanshen] debug menu enabled - Ctrl+` opens it, ` alone opens GM talk");
        }
    });
}

const LevelProbe = {
    "MonsterDataItem.UpdateNormalProp": 0x15D9000,
    "LCBaseCombat.UpdateCombatProp": 0x21A2720,
    "LCMonsterCombat.ChangeLevel": 0x2586740,
    "VCCombatBillboardPlugin.ChangeLevel": 0x21D4AD0,
    "VCCombatBillboardPlugin.InitCombatUI": 0x21D2A30
};

function attachLevelProbe() {
    const base = Module.findBaseAddress("UserAssembly.dll");
    if (base === null) {
        console.log("[Yuanshen] level probe: UserAssembly.dll not loaded");
        return;
    }

    for (const name in LevelProbe) {
        Interceptor.attach(base.add(LevelProbe[name]), {
            onEnter(args) {
                console.log("[level] " + name +
                    " a1=" + args[1].toInt32() +
                    " a2=" + args[2].toInt32() +
                    " a3=" + args[3].toInt32());
            }
        });
    }

    console.log("[Yuanshen] level probe attached at " + base);
}

function UrlRewriter(redirectHost) {
    this.onEnter = function (args) {
        const url = args[1].readManagedString();
        if (!url.startsWith("http://") && !url.startsWith("https://")) return;
        if (url.includes(redirectHost.replace(/^https?:\/\//, ''))) return;

        const prefix = url.split('/', 3).join('/');
        args[1] = Il2Cpp.NewString(url.replace(prefix, redirectHost));
    };
}

const Il2Cpp = {
    NewString(value) {
        const buffer = Memory.allocUtf16String(value);
        return this.Api('il2cpp_string_new_utf16', 'pointer', ['pointer', 'int'], [buffer, value.length]);
    },
    Api(name, ret, argTypes, args) {
        const fn = new NativeFunction(Module.findExportByName(null, name), ret, argTypes);
        return fn.apply(fn, args);
    }
};

const Resolve = {
    Method(moduleName, namespace, className, methodName, argCount) {
        const image = this.Image(moduleName);
        if (image.isNull()) return null;

        const klass = Il2Cpp.Api('il2cpp_class_from_name', 'pointer', ['pointer', 'pointer', 'pointer'],
            [image, Memory.allocUtf8String(namespace), Memory.allocUtf8String(className)]);
        if (klass.isNull()) return null;

        const method = Il2Cpp.Api('il2cpp_class_get_method_from_name', 'pointer', ['pointer', 'pointer', 'int'],
            [klass, Memory.allocUtf8String(methodName), argCount]);
        if (method.isNull()) return null;

        return method.readPointer();
    },
    Image(name) {
        const domain = Il2Cpp.Api('il2cpp_domain_get', 'pointer', [], []);
        const sizeOut = Memory.alloc(8);
        const assemblies = Il2Cpp.Api('il2cpp_domain_get_assemblies', 'pointer', ['pointer', 'pointer'], [domain, sizeOut]);

        const size = sizeOut.readU64();
        for (let i = 0; i < size; i++) {
            const assembly = assemblies.add(i * 8).readPointer();
            const image = Il2Cpp.Api('il2cpp_assembly_get_image', 'pointer', ['pointer'], [assembly]);
            const imageName = Il2Cpp.Api('il2cpp_image_get_name', 'pointer', ['pointer'], [image]);
            if (imageName.readUtf8String() === name) return image;
        }

        return NULL;
    }
};

NativePointer.prototype.readManagedString = function () {
    const length = this.add(16).readInt();
    return this.add(20).readUtf16String(length);
};

rpc.exports.init = main;