/**
 * 跨浏览器硬件指纹采集器
 * 
 * 原理：采集不受浏览器影响的硬件/系统特征，生成统一设备ID
 * 同一台电脑无论Chrome/Edge/Firefox，生成的ID完全一致
 * 
 * 采集特征（跨浏览器稳定不变）：
 * 1. 操作系统平台 (Win32/MacIntel/Linux)
 * 2. 屏幕分辨率 + 颜色深度
 * 3. CPU 核心数
 * 4. 时区偏移
 * 5. WebGL 显卡渲染特征（底层硬件驱动生成，跨浏览器一致）
 * 
 * 隐私合规：仅采集硬件特征，不获取MAC地址、不读取文件、不收集敏感信息
 */
(function() {
    'use strict';

    // SHA-256 哈希实现（纯JS，无外部依赖）
    var SHA256 = (function() {
        var K = [
            0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
            0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
            0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
            0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
            0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
            0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
            0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
            0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
        ];
        function R(x,n){return(x>>>n)|(x<<(32-n));}
        function Ch(x,y,z){return(x&y)^(~x&z);}
        function Maj(x,y,z){return(x&y)^(x&z)^(y&z);}
        function Sigma0(x){return R(x,2)^R(x,13)^R(x,22);}
        function Sigma1(x){return R(x,6)^R(x,11)^R(x,25);}
        function sigma0(x){return R(x,7)^R(x,18)^(x>>>3);}
        function sigma1(x){return R(x,17)^R(x,19)^(x>>>10);}
        function toBytes(s){
            var b=[],l=s.length;
            for(var i=0;i<l;i++){b.push(s.charCodeAt(i)&0xff);}
            b.push(0x80);
            while(b.length%64!==56)b.push(0);
            var bl=l*8;
            for(var i=0;i<8;i++)b.push((bl>>>(56-i*8))&0xff);
            return b;
        }
        function hash(s){
            var bytes=toBytes(s);
            var H=[0x6a09e667,0xbb67ae85,0x3c6ef372,0xa54ff53a,0x510e527f,0x9b05688c,0x1f83d9ab,0x5be0cd19];
            for(var i=0;i<bytes.length;i+=64){
                var W=new Array(64);
                for(var j=0;j<16;j++)W[j]=(bytes[i+j*4]<<24)|(bytes[i+j*4+1]<<16)|(bytes[i+j*4+2]<<8)|bytes[i+j*4+3];
                for(var j=16;j<64;j++)W[j]=(sigma1(W[j-2])+W[j-7]+sigma0(W[j-15])+W[j-16])|0;
                var a=H[0],b=H[1],c=H[2],d=H[3],e=H[4],f=H[5],g=H[6],h=H[7];
                for(var j=0;j<64;j++){
                    var t1=(h+Sigma1(e)+Ch(e,f,g)+K[j]+W[j])|0;
                    var t2=(Sigma0(a)+Maj(a,b,c))|0;
                    h=g;g=f;f=e;e=(d+t1)|0;d=c;c=b;b=a;a=(t1+t2)|0;
                }
                H[0]=(H[0]+a)|0;H[1]=(H[1]+b)|0;H[2]=(H[2]+c)|0;H[3]=(H[3]+d)|0;
                H[4]=(H[4]+e)|0;H[5]=(H[5]+f)|0;H[6]=(H[6]+g)|0;H[7]=(H[7]+h)|0;
            }
            var hex='0123456789abcdef',r='';
            for(var i=0;i<8;i++){var v=H[i];r+=hex[(v>>>28)&0xf]+hex[(v>>>24)&0xf]+hex[(v>>>20)&0xf]+hex[(v>>>16)&0xf]+hex[(v>>>12)&0xf]+hex[(v>>>8)&0xf]+hex[(v>>>4)&0xf]+hex[v&0xf];}
            return r;
        }
        return {hash: hash};
    })();

    function getHardwareFingerprint() {
        var parts = [];

        // 1. 操作系统平台（跨浏览器一致）
        parts.push(navigator.platform || 'unknown');

        // 2. 屏幕分辨率 + 颜色深度（硬件固定）
        parts.push(screen.width + 'x' + screen.height);
        parts.push(String(screen.colorDepth || screen.pixelDepth));

        // 3. CPU 核心数（硬件固定）
        var cores = navigator.hardwareConcurrency || 0;
        parts.push(String(cores));

        // 4. 时区偏移（系统固定）
        parts.push(String(new Date().getTimezoneOffset()));

        // 5. 语言设置（系统级，跨浏览器一致）
        parts.push(navigator.language || navigator.userLanguage || '');

        // 6. WebGL 显卡信息（关键！底层硬件驱动，跨浏览器一致）
        try {
            var canvas = document.createElement('canvas');
            var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
            if (gl) {
                var debugInfo = gl.getExtension('WEBGL_debug_renderer_info');
                if (debugInfo) {
                    var vendor = gl.getParameter(debugInfo.UNMASKED_VENDOR_WEBGL) || '';
                    var renderer = gl.getParameter(debugInfo.UNMASKED_RENDERER_WEBGL) || '';
                    parts.push(vendor);
                    parts.push(renderer);
                } else {
                    // fallback: use basic WebGL parameters
                    parts.push(gl.getParameter(gl.VENDOR) || '');
                    parts.push(gl.getParameter(gl.RENDERER) || '');
                }
            } else {
                parts.push('no_webgl');
            }
        } catch(e) {
            parts.push('webgl_error');
        }

        // 7. 设备内存（如果可用，硬件固定）
        if (navigator.deviceMemory) {
            parts.push(String(navigator.deviceMemory));
        }

        // 8. 触摸支持（硬件固定）
        parts.push(navigator.maxTouchPoints > 0 ? 'touch' : 'no_touch');

        // 拼接后做 SHA-256 哈希
        var raw = parts.join('|||');
        var hash = SHA256.hash(raw);

        // 返回格式化的设备ID
        return 'hw_' + hash.substring(0, 16) + '_' + (navigator.platform || 'x').substring(0, 8);
    }

    // 暴露到全局
    window.getDeviceFingerprint = getHardwareFingerprint;

    // 自动填充隐藏字段
    document.addEventListener('DOMContentLoaded', function() {
        var el = document.getElementById('deviceFingerprint');
        if (el && !el.value) {
            el.value = getHardwareFingerprint();
        }
    });
})();