(function () {
    var trendPayload = null;

    function jsonPost(url, body) {
        return fetch(url, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(body || {})
        }).then(function (r) { return r.json(); });
    }

    function formData(form) {
        var fd = new FormData(form);
        var o = {};
        fd.forEach(function (v, k) { o[k] = v; });
        return o;
    }

    var trendForm = document.getElementById('trend-form');
    var btnPreview = document.getElementById('btn-trend-preview');
    var btnExec = document.getElementById('btn-trend-exec');
    var previewEl = document.getElementById('trend-preview');

    if (btnPreview && trendForm) {
        btnPreview.addEventListener('click', function () {
            jsonPost('/api/strategy/trend/preview', formData(trendForm)).then(function (d) {
                if (!d.ok) { previewEl.textContent = d.error || '预览失败'; btnExec.hidden = true; return; }
                trendPayload = formData(trendForm);
                previewEl.textContent = JSON.stringify(d.plan, null, 2);
                btnExec.hidden = false;
            });
        });
    }
    if (btnExec) {
        btnExec.addEventListener('click', function () {
            if (!trendPayload) return;
            jsonPost('/api/strategy/trend/execute', trendPayload).then(function (d) {
                if (!d.ok) { alert(d.error); return; }
                location.reload();
            });
        });
    }

    var rollForm = document.getElementById('roll-form');
    var btnRollP = document.getElementById('btn-roll-preview');
    var btnRollE = document.getElementById('btn-roll-exec');
    var rollPrev = document.getElementById('roll-preview');
    if (btnRollP && rollForm) {
        btnRollP.addEventListener('click', function () {
            jsonPost('/api/strategy/roll/preview', formData(rollForm)).then(function (d) {
                if (!d.ok) { rollPrev.textContent = d.error; btnRollE.hidden = true; return; }
                rollPrev.textContent = JSON.stringify(d.preview, null, 2);
                btnRollE.hidden = false;
            });
        });
    }
    if (btnRollE && rollForm) {
        btnRollE.addEventListener('click', function () {
            jsonPost('/api/strategy/roll/execute', formData(rollForm)).then(function (d) {
                if (!d.ok) { alert(d.error); return; }
                location.reload();
            });
        });
    }

    var btnStop = document.getElementById('btn-trend-stop');
    if (btnStop) {
        btnStop.addEventListener('click', function () {
            var pid = document.querySelector('#trend-stop-form input[name=plan_id]');
            jsonPost('/api/strategy/trend/stop', { plan_id: pid ? pid.value : 0 }).then(function (d) {
                if (!d.ok) { alert(d.error); return; }
                location.reload();
            });
        });
    }
})();