/* Copyright (c) 2025-2026 马建军. All rights reserved.
 * 专有软件 — 未经授权禁止复制、传播、转售。
 * 详见 LICENSE.zh-CN.txt
 */
(function () {
    var recommendedGroupsCache = null;
    var recommendedGroupsPromise = null;

    function loadRecommendedGroups() {
        if (recommendedGroupsCache) {
            return Promise.resolve(recommendedGroupsCache);
        }
        if (recommendedGroupsPromise) {
            return recommendedGroupsPromise;
        }
        recommendedGroupsPromise = fetch('/api/symbols/recommended')
            .then(function (r) {
                if (!r.ok) {
                    throw new Error('HTTP ' + r.status);
                }
                return r.json();
            })
            .then(function (groups) {
                recommendedGroupsCache = Array.isArray(groups) ? groups : [];
                return recommendedGroupsCache;
            })
            .catch(function () {
                recommendedGroupsCache = null;
                throw new Error('load failed');
            })
            .finally(function () {
                recommendedGroupsPromise = null;
            });
        return recommendedGroupsPromise;
    }

    function formatSub(item) {
        var sub = '同花顺 ' + item.ths_code +
            (item.market_code ? ' · ' + item.market_code : '') +
            ' · ' + (item.exchange || '');
        if (item.max_lots != null && item.max_lots > 0) {
            sub += ' · 最大 ' + item.max_lots + ' 手';
        }
        return sub;
    }

    function formatInputLabel(item) {
        return item.input_label || (item.name + ' ' + item.ths_code);
    }

    function itemMatchesQuery(item, qLower) {
        if (!qLower) return true;
        var hay = (
            item.name + ' ' + item.ths_code + ' ' +
            (item.display || '') + ' ' + (item.contract || '') + ' ' +
            (item.exchange || '')
        ).toLowerCase();
        return hay.indexOf(qLower) >= 0;
    }

    function groupedHasMatch(groups, qLower) {
        if (!qLower) return true;
        return groups.some(function (group) {
            return group.items.some(function (item) {
                return itemMatchesQuery(item, qLower);
            });
        });
    }

    function setupSymbolMetaPlacement(wrapper, selectedEl) {
        if (!selectedEl || wrapper.classList.contains('market-symbol-wrap')) {
            return;
        }
        var label = wrapper.querySelector('label.text-label, label.symbol-field-label');
        if (!label) {
            label = document.createElement('label');
            label.className = 'text-label symbol-field-label';
            label.appendChild(document.createTextNode('品种'));
            var input = wrapper.querySelector('.symbol-input');
            if (input) {
                wrapper.insertBefore(label, input);
            }
        }
        if (selectedEl.parentElement !== label) {
            label.appendChild(selectedEl);
        }
    }

    function initSymbolInput(wrapper) {
        const input = wrapper.querySelector('.symbol-input');
        const hiddenThs = wrapper.querySelector('input[name="symbol"]')
            || wrapper.querySelector('.symbol-ths-code');
        const hiddenName = wrapper.querySelector('input[name="symbol_name"]');
        const hiddenMarket = wrapper.querySelector('input[name="market_code"]');
        const hiddenSina = wrapper.querySelector('input[name="sina_code"]');
        const dropdown = wrapper.querySelector('.symbol-dropdown');
        const selectedEl = wrapper.querySelector('.symbol-selected');
        setupSymbolMetaPlacement(wrapper, selectedEl);
        const isMarketPicker = wrapper.classList.contains('market-symbol-wrap');
        const useMainsPicker = isMarketPicker || wrapper.classList.contains('symbol-mains');
        let timer = null;
        let abortCtrl = null;
        const cache = new Map();
        let mainsCache = null;

        function hideDropdown() {
            dropdown.classList.remove('show');
        }

        function selectItem(item) {
            const label = formatInputLabel(item);
            input.value = label;
            if (hiddenThs) hiddenThs.value = item.ths_code;
            if (hiddenName) hiddenName.value = item.name;
            if (hiddenMarket) hiddenMarket.value = item.market_code || '';
            if (hiddenSina) hiddenSina.value = item.sina_code || '';
            if (selectedEl) selectedEl.textContent = formatSub(item);
            hideDropdown();
            input.dispatchEvent(new CustomEvent('symbol-selected', { detail: item, bubbles: true }));
        }

        function buildOptionEl(item) {
            const div = document.createElement('div');
            div.className = 'symbol-option';
            if (item.near_expiry) {
                div.classList.add('near-expiry');
            }
            var label = item.display || (item.name + ' ' + item.ths_code);
            if (item.near_expiry) {
                label += ' <span class="near-expiry-tag">临期</span>';
            }
            if (item.has_night_session) {
                label += ' <span class="night-session-tag">夜盘</span>';
            }
            div.innerHTML = label +
                '<div class="sub">' + formatSub(item) + '</div>';
            div.addEventListener('mousedown', function (e) {
                e.preventDefault();
                selectItem(item);
            });
            return div;
        }

        function renderItems(items) {
            dropdown.innerHTML = '';
            if (!items.length) {
                dropdown.innerHTML = '<div class="symbol-option">无匹配，可输入同花顺代码如 ag2608</div>';
            } else {
                items.forEach(function (item) {
                    dropdown.appendChild(buildOptionEl(item));
                });
            }
            dropdown.classList.add('show');
        }

        function renderGrouped(groups, filterQ) {
            dropdown.innerHTML = '';
            const qLower = (filterQ || '').trim().toLowerCase();
            let any = false;
            groups.forEach(function (group) {
                const items = group.items.filter(function (item) {
                    return itemMatchesQuery(item, qLower);
                });
                if (!items.length) return;
                any = true;
                const head = document.createElement('div');
                head.className = 'symbol-group-head';
                head.textContent = group.category;
                dropdown.appendChild(head);
                items.forEach(function (item) {
                    dropdown.appendChild(buildOptionEl(item));
                });
            });
            if (!any) {
                dropdown.innerHTML = '<div class="symbol-option">无匹配品种，可输入合约代码如 ag2608</div>';
            }
            dropdown.classList.add('show');
        }

        function showMarketMains(filterQ, onEmpty) {
            const q = (filterQ || '').trim();
            const qLower = q.toLowerCase();
            if (mainsCache) {
                if (!q || groupedHasMatch(mainsCache, qLower)) {
                    renderGrouped(mainsCache, q);
                    return;
                }
                if (typeof onEmpty === 'function') {
                    onEmpty(q);
                    return;
                }
                renderGrouped(mainsCache, q);
                return;
            }
            dropdown.innerHTML = '<div class="symbol-option">正在加载推荐品种…</div>';
            dropdown.classList.add('show');
            loadRecommendedGroups()
                .then(function (groups) {
                    mainsCache = groups;
                    if (!groups.length) {
                        dropdown.innerHTML =
                            '<div class="symbol-option">当前资金下暂无推荐品种，可输入合约代码搜索</div>';
                        dropdown.classList.add('show');
                        return;
                    }
                    showMarketMains(filterQ, onEmpty);
                })
                .catch(function () {
                    dropdown.innerHTML =
                        '<div class="symbol-option">推荐品种加载失败，请刷新页面或输入合约代码搜索</div>';
                    dropdown.classList.add('show');
                });
        }

        function search(q) {
            if (cache.has(q)) {
                renderItems(cache.get(q));
                return;
            }
            if (abortCtrl) {
                abortCtrl.abort();
            }
            abortCtrl = new AbortController();
            fetch('/api/symbols/search?q=' + encodeURIComponent(q), {
                signal: abortCtrl.signal,
            })
                .then(function (r) { return r.json(); })
                .then(function (items) {
                    cache.set(q, items);
                    renderItems(items);
                })
                .catch(function (err) {
                    if (err && err.name === 'AbortError') return;
                    hideDropdown();
                });
        }

        function handleQuery(q) {
            if (useMainsPicker) {
                showMarketMains(q, function (query) {
                    search(query);
                });
            } else {
                search(q);
            }
        }

        input.addEventListener('input', function () {
            if (hiddenThs && hiddenThs !== input) hiddenThs.value = '';
            if (hiddenName) hiddenName.value = '';
            if (hiddenMarket) hiddenMarket.value = '';
            if (hiddenSina) hiddenSina.value = '';
            if (selectedEl) selectedEl.textContent = '';
            const q = input.value.trim();
            if (!q) {
                if (useMainsPicker) {
                    showMarketMains('');
                } else {
                    hideDropdown();
                }
                return;
            }
            clearTimeout(timer);
            timer = setTimeout(function () {
                handleQuery(q);
            }, 120);
        });

        input.addEventListener('blur', function () {
            setTimeout(hideDropdown, 150);
        });

        input.addEventListener('focus', function () {
            const q = input.value.trim();
            if (useMainsPicker) {
                showMarketMains(q, function (query) {
                    if (query) search(query);
                });
                return;
            }
            if (q && hiddenThs && !hiddenThs.value) {
                search(q);
            }
        });
    }

    function initSymbolForms() {
        document.querySelectorAll('.symbol-wrap').forEach(initSymbolInput);

        document.querySelectorAll('form').forEach(function (form) {
            if (!form.querySelector('.symbol-wrap')) return;
            if (form.id === 'market-form') return;
            if (form.dataset.symbolGuard) return;
            form.dataset.symbolGuard = '1';
            form.addEventListener('submit', function (e) {
                const ths = form.querySelector('input[name="symbol"]')
                    || form.querySelector('.symbol-ths-code');
                const market = form.querySelector('input[name="market_code"]');
                if (ths && !ths.value.trim()) {
                    e.preventDefault();
                    alert('请从下拉列表选择品种');
                    return;
                }
                if (market && !market.value.trim()) {
                    e.preventDefault();
                    alert('请从下拉列表选择品种（需含同花顺行情代码）');
                }
            });
        });
    }

    if (window.qihuoOnPageLoad) window.qihuoOnPageLoad(initSymbolForms);
    else document.addEventListener('DOMContentLoaded', initSymbolForms);
})();