// 综合回归测试：标准图 + 特殊图 + 构造场景（策略链各层）
// 用法：node test/all_regression.js
var server = require('../server');
var imgDecode = require('../src/imageDecode');
var qrDecode = require('../src/QRDecode');
var fs = require('fs');
var path = require('path');

var passCount = 0;
var failCount = 0;

function check(label, actual, expected) {
	if (actual === expected) {
		passCount++;
		console.log('PASS  ' + label + '  =>  ' + actual);
	} else {
		failCount++;
		console.log('FAIL  ' + label + '  =>  ' + actual + '（期望 ' + expected + '）');
	}
}

// ---------- 文件用例：标准图 + 特殊图 ----------
var fileCases = [
	{ path: './img/16.bmp', label: 'bmp16', expect: '12345' },
	{ path: './img/24.bmp', label: 'bmp24', expect: '12345' },
	{ path: './img/32.bmp', label: 'bmp32', expect: '12345' },
	{ path: './img/lx.jpg', label: 'jpg_lx', expect: '12345' },
	{ path: './img/yh.jpg', label: 'jpg_yh', expect: '12345' },
	{ path: './img/8.png', label: 'png8', expect: '12345' },
	{ path: './img/24.png', label: 'png24', expect: '12345' },
	{ path: './img/jt.gif', label: 'gif_jt', expect: '12345' },
	{ path: './img/dt.gif', label: 'gif_dt', expect: '12345' },
	{ path: './img/otsu.png', label: 'otsu.png 渐变光照', expect: '中国人' },
	{ path: './img/o1.png', label: 'o1.png 透明背景美化码', expect: '中国人' },
	{ path: './img/o2.png', label: 'o2.png 深色背景美化码', expect: '中国人' },
	{ path: './img/o3.png', label: 'o3.png 低对比度图', expect: 'https://mpl.qzz.io/' }
];

// ---------- 构造场景用例：验证策略链各层 ----------
// 基于 8.png 构造，覆盖：Otsu / 反转 / 反转+Otsu / 数据未污染
var img8 = (function () {
	var buffer = fs.readFileSync(path.join(__dirname, './img/8.png'));
	var imageData = imgDecode.png(buffer);
	if (Array.isArray(imageData)) imageData = imageData[0];
	return imageData;
})();

var builtCases = [];

// 暗化图：RGB × 0.5 -> 需要 Otsu 策略
(function () {
	var data = new Uint8ClampedArray(img8.data.length);
	for (var i = 0; i < img8.data.length; i += 4) {
		data[i] = img8.data[i] * 0.5 | 0;
		data[i + 1] = img8.data[i + 1] * 0.5 | 0;
		data[i + 2] = img8.data[i + 2] * 0.5 | 0;
		data[i + 3] = img8.data[i + 3];
	}
	builtCases.push({ img: { data: data, width: img8.width, height: img8.height }, label: '暗化图(Otsu)', expect: '12345' });
})();

// 反色码：黑底白码 -> 需要反转策略
(function () {
	var data = new Uint8ClampedArray(img8.data.length);
	for (var i = 0; i < img8.data.length; i += 4) {
		var gray = (img8.data[i] * 33.33 + img8.data[i + 1] * 33.33 + img8.data[i + 2] * 33.33) / 100;
		var v = gray <= 153 ? 255 : 0;
		data[i] = v; data[i + 1] = v; data[i + 2] = v; data[i + 3] = 255;
	}
	builtCases.push({ img: { data: data, width: img8.width, height: img8.height }, label: '反色码(反转)', expect: '12345' });
})();

// 暗反色码：黑底灰模块 -> 需要反转+Otsu 策略
(function () {
	var data = new Uint8ClampedArray(img8.data.length);
	for (var i = 0; i < img8.data.length; i += 4) {
		var gray = (img8.data[i] * 33.33 + img8.data[i + 1] * 33.33 + img8.data[i + 2] * 33.33) / 100;
		var v = gray <= 153 ? 95 : 8;
		data[i] = v; data[i + 1] = v; data[i + 2] = v; data[i + 3] = 255;
	}
	builtCases.push({ img: { data: data, width: img8.width, height: img8.height }, label: '暗反色码(反转+Otsu)', expect: '12345' });
})();

// 原图再识别：验证预处理未污染原始数据
builtCases.push({ img: img8, label: '原图再识别(数据未污染)', expect: '12345' });

// ---------- 执行 ----------
var tasks = [];
fileCases.forEach(function (c) {
	tasks.push(server.decodeByPath(path.join(__dirname, c.path))
		.then(function (txt) { check(c.label, txt, c.expect); })
		.catch(function (e) { failCount++; console.log('FAIL  ' + c.label + '  =>  ' + e); }));
});
builtCases.forEach(function (c) {
	tasks.push(Promise.resolve().then(function () {
		try { check(c.label, qrDecode(c.img), c.expect); }
		catch (e) { failCount++; console.log('FAIL  ' + c.label + '  =>  ' + e); }
	}));
});

Promise.all(tasks).then(function () {
	console.log('');
	console.log('========================');
	console.log('综合回归：通过 ' + passCount + ' / 失败 ' + failCount);
	process.exit(failCount > 0 ? 1 : 0);
});