// 定義Generator函數
function* simpleGenerator() {
    debugger;
    console.log('開始執行');
    debugger;
    yield '第一次暫停';
    debugger;
    console.log('恢復執行');
    debugger;
    yield '第二次暫停';
    debugger;
    console.log('結束執行');
    debugger;
    return '最終結果';
}

// 創建Generator對象
const gen = simpleGenerator();
debugger;;
// 逐步執行
console.log(gen.next()); // { value: "第一次暫停", done: false }
debugger;;
console.log(gen.next()); // { value: "第二次暫停", done: false }
debugger;;
console.log(gen.next()); // { value: "最終結果", done: true }

debugger;;

function* counterGenerator() {
    debugger
    let count = 0;
    debugger
    while (true) {
        debugger
        yield count++;
        debugger
    }
}
debugger
const counter = counterGenerator();
debugger
console.log(counter.next().value); // 0
debugger
console.log(counter.next().value); // 1
debugger
console.log(counter.next().value); // 2

debugger

function* interactiveGenerator() {
    debugger
    const name = yield '請輸入你的名字';
    debugger
    const age = yield `你好${name}，請輸入你的年齡`;
    debugger
    return `${name}的年齡是${age}`;
}
debugger
const gen = interactiveGenerator();
debugger
console.log(gen.next());       // { value: "請輸入你的名字", done: false }
debugger
console.log(gen.next('張三')); // { value: "你好張三，請輸入你的年齡", done: false }
debugger
console.log(gen.next(25));     // { value: "張三的年齡是25", done: true }


debugger

// 模擬異步遞增
function asyncIncrement(num, delay) {
    debugger
    return new Promise(resolve => {
        debugger
        setTimeout(() => {
            debugger
            resolve(num + 1)
            debugger
        }, delay);
        debugger
    });
}

// Generator實現計數器
function* counter() {
    debugger
    let count = 0;
    debugger
    console.log('開始計數');
    debugger
    count = yield asyncIncrement(count, 1000);
    debugger
    console.log('計數:', count);
    debugger
    count = yield asyncIncrement(count, 1500);
    debugger
    console.log('計數:', count);
    debugger
    count = yield asyncIncrement(count, 800);
    debugger
    console.log('最終計數:', count);
    debugger
    return count;
}

// 簡化版執行器
function run(genFn) {
    debugger
    const iterator = genFn();
    debugger
    function step(value) {
        debugger
        const result = iterator.next(value);
        debugger
        if (!result.done) {
            debugger
            return result.value.then(step);
        }
        debugger
        return Promise.resolve(result.value);
    }
    debugger
    return step();
}
debugger;;
// 執行計數器
run(counter).then(finalCount => {
    console.log('計數器停止於:', finalCount);
});