<template>
  <div class="opportunity-page student-training-shell">
    <main class="opportunity-core">
      <header class="task-header"><span>产品规划与设计 · MARKET SIGNALS</span><h1>{{ taskTitle }}</h1></header>
      <TrainingTaskBrief :background="taskBackground" :goals="taskGoals" :requirements="taskRequirement" :show-material="false" />
      <section class="workbench">
        <div class="workbench-actions"><TrainingMaterialButton :material-name="taskConfig?.materialName" :material-url="taskConfig?.materialUrl" /><button class="btn" type="button" @click="exportOutcome"><el-icon><Download /></el-icon> 导出实训成果</button></div>
        <nav class="step-indicator" aria-label="市场机会识别与选品步骤"><template v-for="(step, index) in trainingSteps" :key="step"><button type="button" :class="['step-tab', { active: currentStep === index + 1, complete: currentStep > index + 1 }]" @click="switchStep(index + 1)"><b>{{ String(index + 1).padStart(2, '0') }}</b><span><strong>{{ step }}</strong><small>{{ currentStep === index + 1 ? '当前步骤' : '点击切换' }} →</small></span></button><i v-if="index < trainingSteps.length - 1" /></template></nav>
        <section class="step-card">
          <template v-if="currentStep === 1">
            <div class="step-heading"><div><p>Step 01</p><h2>{{ trainingSteps[0] }}</h2></div><em>指标分类练习</em></div>
            <p class="intro">请对实训数据表中的各项指标，按照市场规模、市场潜力、竞争强度、运营难度 4 个类别进行分类。</p>
            <div class="table-wrap"><table><thead><tr><th>序号</th><th>指标</th><th>分类</th></tr></thead><tbody><tr v-for="(item, index) in indicators" :key="item.id"><td>{{ index + 1 }}</td><td class="metric">{{ item.name }}</td><td><select v-model="answers[item.id]" :aria-label="`${item.name} 的分类`"><option value="">请选择</option><option v-for="category in categories" :key="category" :value="category">{{ category }}</option></select></td></tr></tbody></table></div>
            <div class="step-actions"><button class="btn primary" type="button" :disabled="saving" @click="checkAndContinue">判题并进入第 2 步</button><button class="btn" type="button" :disabled="saving" @click="resetStepOne"><el-icon><RefreshLeft /></el-icon> 清空填写</button></div>
          </template>
          <div v-else class="placeholder"><p>第 {{ currentStep }} 步内容待配置</p><span>第 1 步指标分类已保存，可返回查看。</span></div>
        </section>
      </section>
    </main>
    <TrainingAiSidebar study-tip="先辨别指标描述的是规模、增长潜力、供给竞争，还是流量获取难度，再进行归类。" reference-title="指标分类提示" reference-text="· 市场规模：反映需求量与交易体量<br />· 市场潜力：反映增长速度与扩张空间<br />· 竞争强度：反映供给数量与竞争关系<br />· 运营难度：反映获取流量与转化的门槛" :progress-items="progressItems" />
  </div>
</template>

<script setup>
import { Download, RefreshLeft } from "@element-plus/icons-vue";
import { checkMarketOpportunitySelectionStepOne, getStudentTrainingAnswer, saveStudentTrainingAnswer } from "@/api/studentTrainingAnswer";
import { getTrainingTaskByKey } from "@/api/trainingTask";
import TrainingAiSidebar from "@/views/components/TrainingAiSidebar.vue";
import TrainingMaterialButton from "@/views/components/TrainingMaterialButton.vue";
import TrainingTaskBrief from "@/views/components/TrainingTaskBrief.vue";

const TASK_KEY = "market-opportunity-selection";
const DEFAULT_STEPS = ["指标分类", "市场机会分析", "选品方案设计", "选品结论"];
const categories = ["市场规模", "市场潜力", "竞争强度", "运营难度"];
const indicators = [
  { id: "search-count", name: "搜索次数" }, { id: "demand-supply-ratio", name: "需供比" }, { id: "transaction-amount", name: "成交金额(元)" }, { id: "transaction-growth", name: "成交金额增速" },
  { id: "category-transaction-growth", name: "类目成交增速" }, { id: "online-products", name: "在线商品数" }, { id: "online-merchants", name: "在线商家数" }, { id: "organic-traffic-ratio", name: "自然流占比" },
];
const defaultTask = { title: "市场机会识别与选品", background: "基于实训数据中的市场、供给与流量指标，完成市场机会识别和选品判断。", goals: ["理解选品数据指标的业务含义", "掌握市场规模、潜力、竞争和运营难度的分类方法", "为后续选品分析建立指标基础"], requirement: "阅读案例资料，完成 8 项指标的分类，并依据判题反馈修改。" };
const { proxy } = getCurrentInstance();
const taskConfig = ref(null); const currentStep = ref(1); const saving = ref(false); const stepOnePassed = ref(false); const answers = ref(createAnswers());
const taskTitle = computed(() => taskConfig.value?.taskName || defaultTask.title); const taskBackground = computed(() => taskConfig.value?.background || defaultTask.background); const taskGoals = computed(() => parseArray(taskConfig.value?.objectives, defaultTask.goals)); const taskRequirement = computed(() => taskConfig.value?.requirements || defaultTask.requirement); const trainingSteps = computed(() => parseArray(taskConfig.value?.steps, DEFAULT_STEPS));
const progressItems = computed(() => indicators.map((item) => ({ text: `${answers.value[item.id] ? "已分类" : "待分类"}：${item.name}`, status: answers.value[item.id] ? "done" : "" })));
onMounted(async () => { await loadTaskConfig(); await loadSavedAnswer(); });
function createAnswers() { return Object.fromEntries(indicators.map((item) => [item.id, ""])); }
function parseArray(value, fallback) { if (Array.isArray(value)) return value.length ? value : fallback; if (!value) return fallback; try { const parsed = JSON.parse(value); return Array.isArray(parsed) && parsed.length ? parsed.map((item) => String(item?.name ?? item).trim()).filter(Boolean) : fallback; } catch (error) { const list = String(value).split(/[；;|]/).map((item) => item.trim()).filter(Boolean); return list.length ? list : fallback; } }
async function loadTaskConfig() { try { taskConfig.value = (await getTrainingTaskByKey(TASK_KEY))?.data || null; } catch (error) { taskConfig.value = null; } }
async function loadSavedAnswer() { try { const answer = (await getStudentTrainingAnswer(TASK_KEY))?.data; if (answer?.step1Answer) { const parsed = JSON.parse(answer.step1Answer); answers.value = { ...createAnswers(), ...(parsed?.answers || parsed || {}) }; stepOnePassed.value = true; } if (Number(answer?.currentStep) > 0) currentStep.value = Number(answer.currentStep); } catch (error) { /* Keep the page available when history cannot be restored. */ } }
function buildStepOneOutcome() { return { title: taskTitle.value, answers: { ...answers.value } }; }
async function checkAndContinue() { if (saving.value) return; saving.value = true; try { const result = await checkMarketOpportunitySelectionStepOne(indicators.map((item) => ({ id: item.id, category: answers.value[item.id] }))); if (!result?.data?.allCorrect) throw new Error(`当前答对 ${result?.data?.correctCount || 0}/${indicators.length} 项，请根据提示修改`); await saveStudentTrainingAnswer(TASK_KEY, { step1Answer: JSON.stringify(buildStepOneOutcome()), currentStep: 2, submitted: false, saveAction: "SAVE" }); stepOnePassed.value = true; currentStep.value = 2; proxy?.$modal?.msgSuccess("分类正确，已进入第 2 步"); } catch (error) { proxy?.$modal?.msgError?.(error?.message || "请完成指标分类并根据提示修改"); } finally { saving.value = false; } }
function switchStep(step) { if (step > 1 && !stepOnePassed.value) { proxy?.$modal?.msgWarning("请先完成第 1 步指标分类"); return; } currentStep.value = step; }
function resetStepOne() { answers.value = createAnswers(); proxy?.$modal?.msgSuccess("已清空第 1 步填写内容"); }
function exportOutcome() { const blob = new Blob([JSON.stringify({ taskName: taskTitle.value, step1: buildStepOneOutcome(), currentStep: currentStep.value }, null, 2)], { type: "application/json;charset=utf-8" }); const url = URL.createObjectURL(blob); const link = document.createElement("a"); link.href = url; link.download = `${taskTitle.value}-实训结果.json`; link.click(); URL.revokeObjectURL(url); }
</script>

<style lang="scss" scoped>
.opportunity-page { display:grid; grid-template-columns:minmax(720px,1fr) 340px; gap:24px; min-height:calc(100vh - 106px); padding:24px; color:#e9f8ff; background:#06111d; }.opportunity-core { min-width:0; border:1px solid rgba(0,180,255,.25); background:rgba(8,18,28,.64); box-shadow:0 22px 48px rgba(0,0,0,.22); }.task-header { padding:24px 28px 4px; }.task-header span,.step-heading p { color:#66dcff; font-size:13px; font-weight:800; letter-spacing:.08em; }.task-header h1 { margin:9px 0 0; color:#fff; font-size:29px; }.workbench { margin:24px; padding:22px; border:1px solid rgba(33,194,255,.35); border-radius:20px; background:rgba(1,24,39,.72); }.workbench-actions { display:flex; justify-content:flex-end; gap:12px; }.btn { display:inline-flex; align-items:center; justify-content:center; gap:6px; border:1px solid #2cc9ff; border-radius:999px; padding:10px 18px; color:#dff8ff; background:rgba(8,87,121,.55); cursor:pointer; }.primary { border-color:#36d9ff; background:linear-gradient(110deg,#0eaae4,#0572ac); font-weight:700; }.btn:disabled { cursor:not-allowed; opacity:.6; }.step-indicator { display:flex; align-items:center; gap:12px; margin:28px 0; padding:12px; border:1px solid rgba(30,190,255,.28); border-radius:22px; }.step-tab { display:flex; align-items:center; flex:1; gap:10px; min-width:0; padding:10px; border:0; border-radius:16px; color:#96c6d8; background:transparent; text-align:left; cursor:pointer; }.step-tab.active { color:#fff; background:linear-gradient(110deg,#148fc6,#0879aa); }.step-tab b { display:grid; place-items:center; flex:0 0 42px; width:42px; height:42px; border:1px solid #4ed7ff; border-radius:50%; }.step-tab span { display:grid; gap:4px; min-width:0; }.step-tab strong { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }.step-tab small { color:#5ec9ed; }.step-indicator i { flex:0 0 24px; height:2px; background:rgba(83,204,255,.4); }.step-card { padding:24px; border:1px solid rgba(31,185,249,.32); border-radius:18px; background:rgba(1,21,34,.65); }.step-heading { display:flex; justify-content:space-between; align-items:start; }.step-heading p { margin:0; }.step-heading h2 { margin:5px 0 0; color:#fff; font-size:24px; }.step-heading em { border:1px solid #38caff; border-radius:999px; padding:7px 12px; color:#9aeaff; font-style:normal; }.intro { margin:24px 0; color:#c5e4ef; font-size:16px; line-height:1.8; }.table-wrap { overflow-x:auto; }.table-wrap table { width:100%; min-width:720px; border-collapse:collapse; }.table-wrap th,.table-wrap td { border:1px solid rgba(139,213,241,.45); }.table-wrap th { padding:14px; color:#fff; background:#079ed9; font-size:16px; }.table-wrap th:first-child,.table-wrap td:first-child { width:15%; text-align:center; }.table-wrap th:nth-child(2),.metric { width:26%; text-align:center; font-weight:700; }.table-wrap td { padding:10px 18px; }.table-wrap select { display:block; width:min(600px,100%); margin:auto; border:1px solid rgba(115,220,255,.58); border-radius:6px; padding:9px 12px; color:#e9faff; background:#09293c; font:inherit; }.step-actions { display:flex; justify-content:center; gap:12px; margin-top:26px; }.placeholder { padding:94px 20px; color:#a8cfdd; text-align:center; }.placeholder p { color:#fff; font-size:20px; } @media (max-width:1280px) { .opportunity-page { grid-template-columns:1fr; }.step-indicator { overflow-x:auto; }.step-tab { min-width:180px; } } @media (max-width:720px) { .opportunity-page { padding:12px; }.workbench { margin:12px; padding:14px; }.task-header { padding:18px; }.workbench-actions { justify-content:flex-start; flex-wrap:wrap; }.step-heading em { display:none; } }
</style>
