/*******************************************************************************

    uBlock Origin Lite - a comprehensive, MV3-compliant content blocker
    Copyright (C) 2014-present Raymond Hill

    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 {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock

*/

// ruleset: easyprivacy

// Important!
// Isolate from global scope

// Start of local scope
(function uBOL_preventFetch() {

/******************************************************************************/

function preventFetch(...args) {
    preventFetchFn(false, ...args);
}

function preventFetchFn(
    trusted = false,
    propsToMatch = '',
    responseBody = '',
    responseType = ''
) {
    const safe = safeSelf();
    const setTimeout = self.setTimeout;
    const scriptletName = `${trusted ? 'trusted-' : ''}prevent-fetch`;
    const logPrefix = safe.makeLogPrefix(
        scriptletName,
        propsToMatch,
        responseBody,
        responseType
    );
    const extraArgs = safe.getExtraArgs(Array.from(arguments), 4);
    const propNeedles = parsePropertiesToMatchFn(propsToMatch, 'url');
    const validResponseProps = {
        ok: [ false, true ],
        statusText: [ '', 'Not Found' ],
        type: [ 'basic', 'cors', 'default', 'error', 'opaque' ],
    };
    const responseProps = {
        statusText: { value: 'OK' },
    };
    const responseHeaders = {};
    if ( /^\{.*\}$/.test(responseType) ) {
        try {
            Object.entries(JSON.parse(responseType)).forEach(([ p, v ]) => {
                if ( p === 'headers' && trusted ) {
                    Object.assign(responseHeaders, v);
                    return;
                }
                if ( validResponseProps[p] === undefined ) { return; }
                if ( validResponseProps[p].includes(v) === false ) { return; }
                responseProps[p] = { value: v };
            });
        }
        catch { }
    } else if ( responseType !== '' ) {
        if ( validResponseProps.type.includes(responseType) ) {
            responseProps.type = { value: responseType };
        }
    }
    const fetchProps = (src, out) => {
        if ( typeof src !== 'object' || src === null ) { return; }
        const props = [
            'body', 'cache', 'credentials', 'duplex', 'headers',
            'integrity', 'keepalive', 'method', 'mode', 'priority',
            'redirect', 'referrer', 'referrerPolicy', 'signal',
        ];
        for ( const prop of props ) {
            if ( src[prop] === undefined ) { continue; }
            out[prop] = src[prop];
        }
    };
    const fetchDetails = args => {
        const out = {};
        if ( args[0] instanceof self.Request ) {
            out.url = `${args[0].url}`;
            fetchProps(args[0], out);
        } else {
            out.url = `${args[0]}`;
        }
        fetchProps(args[1], out);
        return out;
    };
    proxyApplyFn('fetch', function fetch(context) {
        const { callArgs } = context;
        const details = fetchDetails(callArgs);
        if ( safe.logLevel > 1 || propsToMatch === '' && responseBody === '' ) {
            const out = Array.from(Object.entries(details)).map(a => `${a[0]}:${a[1]}`);
            safe.uboLog(logPrefix, `Called: ${out.join('\n')}`);
        }
        if ( propsToMatch === '' && responseBody === '' ) {
            return context.reflect();
        }
        const matched = matchObjectPropertiesFn(propNeedles, details);
        if ( matched === undefined || matched.length === 0 ) {
            return context.reflect();
        }
        return Promise.resolve(generateContentFn(trusted, responseBody)).then(text => {
            safe.uboLog(logPrefix, `Prevented with response "${text}"`);
            const headers = Object.assign({}, responseHeaders);
            if ( headers['content-length'] === undefined ) {
                headers['content-length'] = text.length;
            }
            const response = new Response(text, { headers });
            const props = Object.assign(
                { url: { value: details.url } },
                responseProps
            );
            safe.Object_defineProperties(response, props);
            if ( extraArgs.throttle ) {
                return new Promise(resolve => {
                    setTimeout(( ) => { resolve(response); }, extraArgs.throttle);
                });
            }
            return response;
        });
    });
}

function generateContentFn(trusted, directive) {
    const safe = safeSelf();
    const randomize = len => {
        const chunks = [];
        let textSize = 0;
        do {
            const s = safe.Math_random().toString(36).slice(2);
            chunks.push(s);
            textSize += s.length;
        }
        while ( textSize < len );
        return chunks.join(' ').slice(0, len);
    };
    if ( directive === 'true' ) {
        return randomize(10);
    }
    if ( directive === 'emptyObj' ) {
        return '{}';
    }
    if ( directive === 'emptyArr' ) {
        return '[]';
    }
    if ( directive === 'emptyStr' ) {
        return '';
    }
    if ( directive.startsWith('length:') ) {
        const match = /^length:(\d+)(?:-(\d+))?$/.exec(directive);
        if ( match === null ) { return ''; }
        const min = parseInt(match[1], 10);
        const extent = safe.Math_max(parseInt(match[2], 10) || 0, min) - min;
        const len = safe.Math_min(min + extent * safe.Math_random(), 500000);
        return randomize(len | 0);
    }
    if ( directive.startsWith('war:') ) {
        if ( scriptletGlobals.warOrigin === undefined ) { return ''; }
        return new Promise(resolve => {
            const warOrigin = scriptletGlobals.warOrigin;
            const warName = directive.slice(4);
            const fullpath = [ warOrigin, '/', warName ];
            const warSecret = scriptletGlobals.warSecret;
            if ( warSecret !== undefined ) {
                fullpath.push('?secret=', warSecret);
            }
            const warXHR = new safe.XMLHttpRequest();
            warXHR.responseType = 'text';
            warXHR.onloadend = ev => {
                resolve(ev.target.responseText || '');
            };
            warXHR.open('GET', fullpath.join(''));
            warXHR.send();
        }).catch(( ) => '');
    }
    if ( trusted ) {
        return directive;
    }
    return '';
}

function matchObjectPropertiesFn(propNeedles, ...objs) {
    const safe = safeSelf();
    const matched = [];
    for ( const obj of objs ) {
        if ( obj instanceof Object === false ) { continue; }
        for ( const [ prop, details ] of propNeedles ) {
            let value = obj[prop];
            if ( value === undefined ) { continue; }
            if ( typeof value !== 'string' ) {
                try { value = safe.JSON_stringify(value); }
                catch { }
                if ( typeof value !== 'string' ) { continue; }
            }
            if ( safe.testPattern(details, value) === false ) { return; }
            matched.push(`${prop}: ${value}`);
        }
    }
    return matched;
}

function parsePropertiesToMatchFn(propsToMatch, implicit = '') {
    const safe = safeSelf();
    const needles = new Map();
    if ( propsToMatch === undefined || propsToMatch === '' ) { return needles; }
    const options = { canNegate: true };
    for ( const needle of safe.String_split.call(propsToMatch, /\s+/) ) {
        let [ prop, pattern ] = safe.String_split.call(needle, ':');
        if ( prop === '' ) { continue; }
        if ( pattern !== undefined && /[^$\w -]/.test(prop) ) {
            prop = `${prop}:${pattern}`;
            pattern = undefined;
        }
        if ( pattern !== undefined ) {
            needles.set(prop, safe.initPattern(pattern, options));
        } else if ( implicit !== '' ) {
            needles.set(implicit, safe.initPattern(prop, options));
        }
    }
    return needles;
}

function proxyApplyFn(
    target = '',
    handler = ''
) {
    let context = globalThis;
    let prop = target;
    for (;;) {
        const pos = prop.indexOf('.');
        if ( pos === -1 ) { break; }
        context = context[prop.slice(0, pos)];
        if ( context instanceof Object === false ) { return; }
        prop = prop.slice(pos+1);
    }
    const fn = context[prop];
    if ( typeof fn !== 'function' ) { return; }
    if ( proxyApplyFn.CtorContext === undefined ) {
        proxyApplyFn.ctorContexts = [];
        proxyApplyFn.CtorContext = class {
            constructor(...args) {
                this.init(...args);
            }
            init(callFn, callArgs) {
                this.callFn = callFn;
                this.callArgs = callArgs;
                return this;
            }
            reflect() {
                const r = Reflect.construct(this.callFn, this.callArgs);
                this.callFn = this.callArgs = this.private = undefined;
                proxyApplyFn.ctorContexts.push(this);
                return r;
            }
            static factory(...args) {
                return proxyApplyFn.ctorContexts.length !== 0
                    ? proxyApplyFn.ctorContexts.pop().init(...args)
                    : new proxyApplyFn.CtorContext(...args);
            }
        };
        proxyApplyFn.applyContexts = [];
        proxyApplyFn.ApplyContext = class {
            constructor(...args) {
                this.init(...args);
            }
            init(callFn, thisArg, callArgs) {
                this.callFn = callFn;
                this.thisArg = thisArg;
                this.callArgs = callArgs;
                return this;
            }
            reflect() {
                const r = Reflect.apply(this.callFn, this.thisArg, this.callArgs);
                this.callFn = this.thisArg = this.callArgs = this.private = undefined;
                proxyApplyFn.applyContexts.push(this);
                return r;
            }
            static factory(...args) {
                return proxyApplyFn.applyContexts.length !== 0
                    ? proxyApplyFn.applyContexts.pop().init(...args)
                    : new proxyApplyFn.ApplyContext(...args);
            }
        };
        proxyApplyFn.isCtor = new Map();
    }
    if ( proxyApplyFn.isCtor.has(target) === false ) {
        proxyApplyFn.isCtor.set(target, fn.prototype?.constructor === fn);
    }
    const fnStr = fn.toString();
    const toString = (function toString() { return fnStr; }).bind(null);
    const proxyDetails = {
        apply(target, thisArg, args) {
            return handler(proxyApplyFn.ApplyContext.factory(target, thisArg, args));
        },
        get(target, prop) {
            if ( prop === 'toString' ) { return toString; }
            return Reflect.get(target, prop);
        },
    };
    if ( proxyApplyFn.isCtor.get(target) ) {
        proxyDetails.construct = function(target, args) {
            return handler(proxyApplyFn.CtorContext.factory(target, args));
        };
    }
    context[prop] = new Proxy(fn, proxyDetails);
}

function safeSelf() {
    if ( scriptletGlobals.safeSelf ) {
        return scriptletGlobals.safeSelf;
    }
    const self = globalThis;
    const safe = {
        'Array_from': Array.from,
        'Error': self.Error,
        'Function_toStringFn': self.Function.prototype.toString,
        'Function_toString': thisArg => safe.Function_toStringFn.call(thisArg),
        'Math_floor': Math.floor,
        'Math_max': Math.max,
        'Math_min': Math.min,
        'Math_random': Math.random,
        'Object': Object,
        'Object_defineProperty': Object.defineProperty.bind(Object),
        'Object_defineProperties': Object.defineProperties.bind(Object),
        'Object_fromEntries': Object.fromEntries.bind(Object),
        'Object_getOwnPropertyDescriptor': Object.getOwnPropertyDescriptor.bind(Object),
        'Object_hasOwn': Object.hasOwn.bind(Object),
        'RegExp': self.RegExp,
        'RegExp_test': self.RegExp.prototype.test,
        'RegExp_exec': self.RegExp.prototype.exec,
        'Request_clone': self.Request.prototype.clone,
        'String': self.String,
        'String_fromCharCode': String.fromCharCode,
        'String_split': String.prototype.split,
        'XMLHttpRequest': self.XMLHttpRequest,
        'addEventListener': self.EventTarget.prototype.addEventListener,
        'removeEventListener': self.EventTarget.prototype.removeEventListener,
        'fetch': self.fetch,
        'JSON': self.JSON,
        'JSON_parseFn': self.JSON.parse,
        'JSON_stringifyFn': self.JSON.stringify,
        'JSON_parse': (...args) => safe.JSON_parseFn.call(safe.JSON, ...args),
        'JSON_stringify': (...args) => safe.JSON_stringifyFn.call(safe.JSON, ...args),
        'log': console.log.bind(console),
        // Properties
        logLevel: 0,
        // Methods
        makeLogPrefix(...args) {
            return this.sendToLogger && `[${args.join(' \u205D ')}]` || '';
        },
        uboLog(...args) {
            if ( this.sendToLogger === undefined ) { return; }
            if ( args === undefined || args[0] === '' ) { return; }
            return this.sendToLogger('info', ...args);
            
        },
        uboErr(...args) {
            if ( this.sendToLogger === undefined ) { return; }
            if ( args === undefined || args[0] === '' ) { return; }
            return this.sendToLogger('error', ...args);
        },
        escapeRegexChars(s) {
            return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
        },
        initPattern(pattern, options = {}) {
            if ( pattern === '' ) {
                return { matchAll: true, expect: true };
            }
            const expect = (options.canNegate !== true || pattern.startsWith('!') === false);
            if ( expect === false ) {
                pattern = pattern.slice(1);
            }
            const match = /^\/(.+)\/([gimsu]*)$/.exec(pattern);
            if ( match !== null ) {
                return {
                    re: new this.RegExp(
                        match[1],
                        match[2] || options.flags
                    ),
                    expect,
                };
            }
            if ( options.flags !== undefined ) {
                return {
                    re: new this.RegExp(this.escapeRegexChars(pattern),
                        options.flags
                    ),
                    expect,
                };
            }
            return { pattern, expect };
        },
        testPattern(details, haystack) {
            if ( details.matchAll ) { return true; }
            if ( details.re ) {
                return this.RegExp_test.call(details.re, haystack) === details.expect;
            }
            return haystack.includes(details.pattern) === details.expect;
        },
        patternToRegex(pattern, flags = undefined, verbatim = false) {
            if ( pattern === '' ) { return /^/; }
            const match = /^\/(.+)\/([gimsu]*)$/.exec(pattern);
            if ( match === null ) {
                const reStr = this.escapeRegexChars(pattern);
                return new RegExp(verbatim ? `^${reStr}$` : reStr, flags);
            }
            try {
                return new RegExp(match[1], match[2] || undefined);
            }
            catch {
            }
            return /^/;
        },
        getExtraArgs(args, offset = 0) {
            const entries = args.slice(offset).reduce((out, v, i, a) => {
                if ( (i & 1) === 0 ) {
                    const rawValue = a[i+1];
                    const value = /^\d+$/.test(rawValue)
                        ? parseInt(rawValue, 10)
                        : rawValue;
                    out.push([ a[i], value ]);
                }
                return out;
            }, []);
            return this.Object_fromEntries(entries);
        },
        onIdle(fn, options) {
            if ( self.requestIdleCallback ) {
                return self.requestIdleCallback(fn, options);
            }
            return self.requestAnimationFrame(fn);
        },
        offIdle(id) {
            if ( self.requestIdleCallback ) {
                return self.cancelIdleCallback(id);
            }
            return self.cancelAnimationFrame(id);
        }
    };
    scriptletGlobals.safeSelf = safe;
    if ( scriptletGlobals.bcSecret === undefined ) { return safe; }
    // This is executed only when the logger is opened
    safe.logLevel = scriptletGlobals.logLevel || 1;
    let lastLogType = '';
    let lastLogText = '';
    let lastLogTime = 0;
    safe.toLogText = (type, ...args) => {
        if ( args.length === 0 ) { return; }
        const text = `[${document.location.hostname || document.location.href}]${args.join(' ')}`;
        if ( text === lastLogText && type === lastLogType ) {
            if ( (Date.now() - lastLogTime) < 5000 ) { return; }
        }
        lastLogType = type;
        lastLogText = text;
        lastLogTime = Date.now();
        return text;
    };
    try {
        const bc = new self.BroadcastChannel(scriptletGlobals.bcSecret);
        let bcBuffer = [];
        safe.sendToLogger = (type, ...args) => {
            const text = safe.toLogText(type, ...args);
            if ( text === undefined ) { return; }
            if ( bcBuffer === undefined ) {
                return bc.postMessage({ what: 'messageToLogger', type, text });
            }
            bcBuffer.push({ type, text });
        };
        bc.onmessage = ev => {
            const msg = ev.data;
            switch ( msg ) {
            case 'iamready!':
                if ( bcBuffer === undefined ) { break; }
                bcBuffer.forEach(({ type, text }) =>
                    bc.postMessage({ what: 'messageToLogger', type, text })
                );
                bcBuffer = undefined;
                break;
            case 'setScriptletLogLevelToOne':
                safe.logLevel = 1;
                break;
            case 'setScriptletLogLevelToTwo':
                safe.logLevel = 2;
                break;
            }
        };
        bc.postMessage('areyouready?');
    } catch {
        safe.sendToLogger = (type, ...args) => {
            const text = safe.toLogText(type, ...args);
            if ( text === undefined ) { return; }
            safe.log(`uBO ${text}`);
        };
    }
    return safe;
}

/******************************************************************************/

const scriptletGlobals = {}; // eslint-disable-line
const argsList = [["stella"]];
const hostnamesMap = new Map([["nicovideo.jp",0]]);
const exceptionsMap = new Map([]);
const hasEntities = false;
const hasAncestors = false;

const collectArgIndices = (hn, map, out) => {
    let argsIndices = map.get(hn);
    if ( argsIndices === undefined ) { return; }
    if ( typeof argsIndices !== 'number' ) {
        for ( const argsIndex of argsIndices ) {
            out.add(argsIndex);
        }
    } else {
        out.add(argsIndices);
    }
};

const indicesFromHostname = (hostname, suffix = '') => {
    const hnParts = hostname.split('.');
    const hnpartslen = hnParts.length;
    if ( hnpartslen === 0 ) { return; }
    for ( let i = 0; i < hnpartslen; i++ ) {
        const hn = `${hnParts.slice(i).join('.')}${suffix}`;
        collectArgIndices(hn, hostnamesMap, todoIndices);
        collectArgIndices(hn, exceptionsMap, tonotdoIndices);
    }
    if ( hasEntities ) {
        const n = hnpartslen - 1;
        for ( let i = 0; i < n; i++ ) {
            for ( let j = n; j > i; j-- ) {
                const en = `${hnParts.slice(i,j).join('.')}.*${suffix}`;
                collectArgIndices(en, hostnamesMap, todoIndices);
                collectArgIndices(en, exceptionsMap, tonotdoIndices);
            }
        }
    }
};

const entries = (( ) => {
    const docloc = document.location;
    const origins = [ docloc.origin ];
    if ( docloc.ancestorOrigins ) {
        origins.push(...docloc.ancestorOrigins);
    }
    return origins.map((origin, i) => {
        const beg = origin.lastIndexOf('://');
        if ( beg === -1 ) { return; }
        const hn = origin.slice(beg+3)
        const end = hn.indexOf(':');
        return { hn: end === -1 ? hn : hn.slice(0, end), i };
    }).filter(a => a !== undefined);
})();
if ( entries.length === 0 ) { return; }

const todoIndices = new Set();
const tonotdoIndices = new Set();

indicesFromHostname(entries[0].hn);
if ( hasAncestors ) {
    for ( const entry of entries ) {
        if ( entry.i === 0 ) { continue; }
        indicesFromHostname(entry.hn, '>>');
    }
}

// Apply scriplets
for ( const i of todoIndices ) {
    if ( tonotdoIndices.has(i) ) { continue; }
    try { preventFetch(...argsList[i]); }
    catch { }
}

/******************************************************************************/

// End of local scope
})();

void 0;
