const { createApp, ref, computed, watch, nextTick, onMounted } = Vue;

createApp({
    setup() {
        // ==========================================
        // Common State
        // ==========================================
        const activeTab = ref('dashboard');
        const apiBase = ref(window.location.origin || "http://localhost:8000");
        const isMobile = ref(window.innerWidth <= 768);

        // Handle window resize
        window.addEventListener('resize', () => {
            isMobile.value = window.innerWidth <= 768;
            if (chartInstance) chartInstance.resize();
        });

        // ==========================================
        // Dashboard State & Logic
        // ==========================================
        const operators = ref([
            {label:"新电途",value:"新电途"},
            {label:"特来电",value:"特来电"},
            {label:"驿来特",value:"驿来特"},
            {label:"艾特吉易充",value:"艾特吉易充"}
        ]);
        const selectedOperator = ref("驿来特");
        const aiText = ref("");
        const placeholder = ref("");
        const loading = ref(false);
        const exporting = ref(false);
        const exportingReport = ref(false);
        const aiLoading = ref(false);
        const aiBoxRef = ref(null);
        const priceTableRows = ref([]);
        const hourlyPricesByOperator = ref({});
        let chartInstance = null;

        const initChart = () => {
            const dom = document.getElementById("chart");
            if (dom && !chartInstance) {
                chartInstance = echarts.init(dom);
            }
        };

        const buildPriceTable = () => {
            const rows = [];
            for (let h = 0; h < 24; h++) {
                const row = {hour: (h.toString().padStart(2,"0") + ":00"), values: []};
                operators.value.forEach(op => {
                    const series = hourlyPricesByOperator.value[op.value] || [];
                    const price = series[h] !== undefined ? series[h] : null;
                    row.values.push({operator: op.value, price});
                });
                rows.push(row);
            }
            priceTableRows.value = rows;
            if (chartInstance) {
                const series = operators.value.map(op => {
                    const seriesData = [];
                    for (let h = 0; h < 24; h++) {
                        const list = hourlyPricesByOperator.value[op.value] || [];
                        seriesData.push(list[h] !== undefined ? list[h] : null);
                    }
                    return {name: op.label, type:"line", smooth:true, data:seriesData};
                });
                const hours = rows.map(r => r.hour);
                const option = {
                    backgroundColor: 'transparent',
                    tooltip: {
                        trigger: "axis",
                        backgroundColor: 'rgba(30, 41, 59, 0.9)',
                        borderColor: '#334155',
                        textStyle: { color: '#f1f5f9' }
                    },
                    legend: {
                        data: operators.value.map(o => o.label),
                        textStyle: { color: "#94a3b8" },
                        bottom: 0
                    },
                    xAxis: {
                        type: "category",
                        data: hours,
                        axisLine: { lineStyle: { color: "#475569" } },
                        axisLabel: { color: "#94a3b8" }
                    },
                    yAxis: {
                        type: "value",
                        name: "元/度",
                        nameTextStyle: { color: "#94a3b8" },
                        axisLine: { lineStyle: { color: "#475569" } },
                        axisLabel: { color: "#94a3b8" },
                        splitLine: { lineStyle: { color: "#334155", type: 'dashed' } }
                    },
                    grid: { left: 50, right: 30, top: 40, bottom: 40 },
                    series: series
                };
                chartInstance.setOption(option);
            }
        };

        const loadAllOperatorsPrices = async () => {
            loading.value = true;
            try{
                const res = await axios.get(apiBase.value + "/api/operators/hourly-prices");
                if (res && res.data && Array.isArray(res.data.operators)) {
                    const dict = {};
                    res.data.operators.forEach(item => {
                        dict[item.operator] = item.series || [];
                    });
                    hourlyPricesByOperator.value = dict;
                    buildPriceTable();
                }
            }catch(e){
                console.error(e);
            }finally{
                loading.value = false;
            }
        };

        const exportAllPrices = async () => {
            try{
                exporting.value = true;
                const res = await axios.get(apiBase.value + "/api/export/prices-zip",{responseType:"blob"});
                const blob = new Blob([res.data],{type:"application/zip"});
                const url = window.URL.createObjectURL(blob);
                const a = document.createElement("a");
                a.href = url;
                a.download = "多供应商电价导出.zip";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                window.URL.revokeObjectURL(url);
            }catch(e){
                console.error(e);
            }finally{
                exporting.value = false;
            }
        };

        const exportAiReport = async () => {
            if (!aiText.value) {
                alert("请先生成AI分析报告");
                return;
            }
            try {
                exportingReport.value = true;
                const res = await axios.post(apiBase.value + "/api/export/ai-report-docx", {
                    content: aiText.value
                }, {responseType: "blob"});
                
                const blob = new Blob([res.data], {type: "application/vnd.openxmlformats-officedocument.wordprocessingml.document"});
                const url = window.URL.createObjectURL(blob);
                const a = document.createElement("a");
                a.href = url;
                a.download = "AI分析报告.docx";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                window.URL.revokeObjectURL(url);
            } catch (e) {
                console.error(e);
                alert("导出失败，请检查是否安装Pandoc");
            } finally {
                exportingReport.value = false;
            }
        };

        const startAiAnalysis = async () => {
            if (aiLoading.value) return;
            aiText.value = "";
            aiLoading.value = true;
            try{
                const response = await fetch(apiBase.value + "/api/ai/pricing/strategy-summary");
                if (!response.body) return;
                const reader = response.body.getReader();
                const decoder = new TextDecoder();
                
                while (true) {
                    const {done, value} = await reader.read();
                    if (done) break;
                    const chunk = decoder.decode(value, {stream: true});
                    aiText.value += chunk;
                    await Vue.nextTick();
                    if (aiBoxRef.value) {
                        aiBoxRef.value.scrollTop = aiBoxRef.value.scrollHeight;
                    }
                }
            }catch(e){
                console.error(e);
                aiText.value += "\n(分析过程出错: " + e.message + ")";
            }finally{
                aiLoading.value = false;
            }
        };

        const formatCell = v => {
            if (v === null || v === undefined || v === "") return "-";
            if (typeof v === "number") {
                if (Number.isNaN(v)) return "-";
                return v.toFixed(2);
            }
            return v;
        };

        const getPriceColor = (price) => {
            if (price === null || price === undefined) return 'inherit';
            if (price > 1.2) return '#ef4444'; // Red-500
            if (price < 0.8) return '#10b981'; // Emerald-500
            return '#f1f5f9'; // Slate-100
        };

        // ==========================================
        // Degree Query State & Logic
        // ==========================================
        const userQuery = ref('');
        const queryLoading = ref(false);
        const queryResult = ref('');
        const eventSource = ref(null);
        const rowsAcc = ref([]);
        const bufferRow = ref(null);
        const examples = [
            "查询12月份充电量TOP 10场站的充电情况",
            "查询净月商贸城站12月的充电量",
            "查询12月企业充电量排名的TOP 10",
            "查询所有场站的近3个月的充电情况，找出变化最大的前10名"
        ];

        // Helpers
        const isPlainObject = (obj) => Object.prototype.toString.call(obj) === '[object Object]';
        const colSynonyms = {
            name: ['name', 'station', 'station_name', 'site', '场站', '场站名称', '站点', '站名'],
            total: ['total', 'total_kwh', 'sum_kwh', 'energy_total', '总电量', '总充电量', '总度', '总度数'],
            peak: ['peak', 'peak_kwh', 'energy_peak', '峰', '峰时电量'],
            flat: ['flat', 'flat_kwh', 'energy_flat', '平', '平时电量'],
            valley: ['valley', 'valley_kwh', 'energy_valley', '谷', '谷时电量'],
        };
        const pickKey = (obj, keys) => keys.find(k => Object.prototype.hasOwnProperty.call(obj, k));
        const pickVal = (obj, keys) => {
            const k = pickKey(obj, keys);
            return k ? obj[k] : undefined;
        };
        
        const formatNumber = (n) => {
            if (n === null || n === undefined || n === '') return '';
            const v = parseFloat(String(n).replace(/,/g, ''));
            if (isNaN(v)) return String(n);
            return v.toLocaleString('zh-CN', { maximumFractionDigits: 2 });
        };

        const pushRow = (row) => {
            if (!row || !row.name) return;
            rowsAcc.value.push(row);
            const r = row;
            const line = `| ${r.name ?? ''} | ${formatNumber(r.total)} | ${formatNumber(r.peak)} | ${formatNumber(r.flat)} | ${formatNumber(r.valley)} |`;
            
            if (rowsAcc.value.length === 1) {
                 const header = `| 场站名称 | 总电量 | 峰 | 平 | 谷 |\n| --- | ---: | ---: | ---: | ---: |`;
                 if (queryResult.value && !queryResult.value.endsWith('\n')) {
                     queryResult.value += '\n\n';
                 } else if (queryResult.value) {
                     queryResult.value += '\n';
                 }
                 queryResult.value += header + '\n';
            }
            queryResult.value += line + '\n';
        };

        const toSelectedRow = (row) => {
            if (!isPlainObject(row)) return null;
            const name = pickVal(row, colSynonyms.name);
            const total = pickVal(row, colSynonyms.total);
            const peak = pickVal(row, colSynonyms.peak);
            const flat = pickVal(row, colSynonyms.flat);
            const valley = pickVal(row, colSynonyms.valley);
            if (name === undefined) return null;
            return { name, total, peak, flat, valley };
        };

        // Degree Search Logic
        const handleDegreeSearch = () => {
            if (!userQuery.value.trim()) {
                if (typeof ElementPlus !== 'undefined') ElementPlus.ElMessage.warning('请输入您的问题');
                else alert('请输入您的问题');
                return;
            }

            if (queryLoading.value) {
                if (eventSource.value) {
                    eventSource.value.close();
                }
            }

            queryLoading.value = true;
            queryResult.value = '';
            rowsAcc.value = [];
            bufferRow.value = null;
            
            // Construct the SSE URL
            const url = `${apiBase.value}/degree/chat?q=${encodeURIComponent(userQuery.value)}`;

            try {
                const es = new EventSource(url);
                eventSource.value = es;

                es.onmessage = (event) => {
                    const eventData = event.data.trim();
                    if (eventData === '[DONE]') {
                        queryLoading.value = false;
                        es.close();
                        return;
                    }

                    try {
                        const data = JSON.parse(event.data);
                        
                        let chunk = '';
                        if (data.content) chunk = data.content;
                        else if (data.markdown) chunk = data.markdown;
                        else if (data.chunk) chunk = data.chunk;
                        else if (typeof data === 'string') chunk = data;
                        
                        if (chunk) {
                            queryResult.value += chunk;
                        }
                    } catch (e) {
                        if (eventData && eventData !== '[DONE]') {
                            queryResult.value += event.data;
                        }
                    }
                };

                es.onerror = (err) => {
                    console.error('SSE Error:', err);
                    queryLoading.value = false;
                    es.close();
                    if (!queryResult.value) {
                        queryResult.value = '查询过程出现异常，未能获取到数据';
                    }
                };
            } catch (err) {
                console.error('Failed to create EventSource:', err);
                queryLoading.value = false;
                if (typeof ElementPlus !== 'undefined') ElementPlus.ElMessage.error('无法建立连接');
                else alert('无法建立连接');
            }
        };

        const stopDegreeGeneration = () => {
            if (eventSource.value) {
                eventSource.value.close();
                eventSource.value = null;
            }
            queryLoading.value = false;
        };

        const setExample = (text) => {
            userQuery.value = text;
            handleDegreeSearch();
        };

        const renderCharts = () => {
            if (typeof echarts === 'undefined') return;
            nextTick(() => {
                const containers = document.querySelectorAll('.echarts-container');
                containers.forEach(container => {
                    if (container.getAttribute('data-rendered') === 'true') return;
                    try {
                        const configStr = decodeURIComponent(container.getAttribute('data-config')).trim();
                        if (!configStr.startsWith('{') || !configStr.endsWith('}')) return;
                        const config = JSON.parse(configStr);
                        let chart = echarts.getInstanceByDom(container);
                        if (!chart) {
                            chart = echarts.init(container, 'dark');
                            window.addEventListener('resize', () => chart.resize());
                        }
                        chart.setOption(config);
                        container.setAttribute('data-rendered', 'true');
                        container.style.opacity = '1';
                    } catch (e) {
                        if (queryLoading.value) return; 
                        console.error('ECharts rendering error:', e);
                        container.innerHTML = `<p style="color: #ef4444; padding: 10px;">图表渲染失败: ${e.message}</p>`;
                    }
                });
            });
        };

        // ==========================================
        // Computed Properties (Markdown)
        // ==========================================
        
        marked.use({
            gfm: true,
            breaks: true,
            mangle: false,
            headerIds: false,
            renderer: {
                code(code, language) {
                    if (language === 'echarts') {
                        const id = 'chart-' + Math.random().toString(36).substr(2, 9);
                        return `<div class="echarts-container" id="${id}" style="width: 100%; height: 400px; margin: 20px 0; background: rgba(30, 41, 59, 0.5); border: 1px solid rgba(148, 163, 184, 0.1); border-radius: 12px; padding: 20px;" data-config="${encodeURIComponent(code)}"></div>`;
                    }
                    return false; // Use default for others
                }
            }
        });

        const renderedAiText = computed(() => {
            if (!aiText.value) return "";
            try {
                return marked.parse(aiText.value);
            } catch (e) {
                return aiText.value;
            }
        });

        const renderedResult = computed(() => {
            if (!queryResult.value) return '';
            try {
                const cleanText = queryResult.value.replace(/\\([\*_`#\[\]\(\)!>-])/g, '$1');
                return marked.parse(cleanText);
            } catch (e) {
                console.error('Markdown parsing error:', e);
                return queryResult.value;
            }
        });

        // ==========================================
        // Watchers
        // ==========================================
        watch(aiText, () => {
            nextTick(() => {
                const el = document.querySelector('.ai-result');
                if (el && window.renderMathInElement) {
                    renderMathInElement(el, {
                        delimiters: [
                            {left: '$$', right: '$$', display: true},
                            {left: '$', right: '$', display: false},
                            {left: '\\(', right: '\\)', display: false},
                            {left: '\\[', right: '\\]', display: true}
                        ],
                        throwOnError: false
                    });
                }
            });
        });

        watch(queryResult, (newVal) => {
            nextTick(() => {
                const el = document.querySelector('.markdown-body');
                if (el && window.renderMathInElement) {
                    renderMathInElement(el, {
                        delimiters: [
                            {left: '$$', right: '$$', display: true},
                            {left: '$', right: '$', display: false},
                            {left: '\\(', right: '\\)', display: false},
                            {left: '\\[', right: '\\]', display: true}
                        ],
                        throwOnError: false
                    });
                }
            });
            if (newVal && newVal.includes('```echarts')) {
                renderCharts();
            }
        });

        // ==========================================
        // Lifecycle
        // ==========================================
        onMounted(() => {
            // Dashboard init
            initChart();
            loadAllOperatorsPrices();
            startAiAnalysis();

            // Degree QR Code
            if (!isMobile.value && typeof QRCode !== 'undefined') {
                const qrEl = document.getElementById("qrcode");
                if (qrEl) {
                    qrEl.innerHTML = '';
                    new QRCode(qrEl, {
                        text: window.location.href,
                        width: 256,
                        height: 256,
                        colorDark: "#000000",
                        colorLight: "#ffffff",
                        correctLevel: QRCode.CorrectLevel.M
                    });
                }
            }
        });

        return {
            activeTab, apiBase, isMobile,
            // Dashboard
            operators, selectedOperator, aiText, placeholder, loading, exporting, exportingReport, aiLoading, priceTableRows, aiBoxRef,
            loadAllOperatorsPrices, exportAllPrices, exportAiReport, startAiAnalysis, formatCell, getPriceColor, renderedAiText,
            // Degree
            userQuery, queryLoading, queryResult, examples,
            handleDegreeSearch, setExample, renderedResult, stopDegreeGeneration
        };
    }
}).use(ElementPlus).mount("#app");