import type {
  DemoCard,
  DemoLocale,
  DemoMode,
  DemoTabId,
  MockAgentResult,
  ProgressStep,
  ProgressStepStatus,
  TraceItem,
} from './types';

interface WorkflowTemplate {
  label: string;
  detail: string;
  doneDetail: string;
  kind: TraceItem['kind'];
  durationMs: number;
}

interface RunMockAgentParams {
  tab: DemoTabId;
  input: string;
  locale: DemoLocale;
  mode: DemoMode;
  onWorkflowInit: (steps: ProgressStep[]) => void;
  onStepStatus: (stepId: string, status: ProgressStepStatus, detail?: string) => void;
  onTrace: (item: TraceItem) => void;
}

const WORKFLOWS: Record<DemoLocale, Record<DemoTabId, WorkflowTemplate[]>> = {
  en: {
    chat: [
      {
        label: 'Understanding user intent',
        detail: 'Parsing the latest message and session context.',
        doneDetail: 'Intent and preferred action recognized.',
        kind: 'planner',
        durationMs: 600,
      },
      {
        label: 'Planning tool route',
        detail: 'Selecting the best backend function and argument set.',
        doneDetail: 'Tool route and arguments prepared.',
        kind: 'planner',
        durationMs: 700,
      },
      {
        label: 'Executing tool call',
        detail: 'Running product/store/statistics action.',
        doneDetail: 'Tool returned structured data.',
        kind: 'tool',
        durationMs: 900,
      },
      {
        label: 'Rendering response',
        detail: 'Composing concise answer + rich cards.',
        doneDetail: 'Final message and cards generated.',
        kind: 'renderer',
        durationMs: 500,
      },
    ],
    voice: [
      {
        label: 'Normalizing transcript',
        detail: 'Detecting language and cleaning transcript text.',
        doneDetail: 'Transcript normalized.',
        kind: 'validator',
        durationMs: 600,
      },
      {
        label: 'Choosing assistant tool',
        detail: 'Mapping spoken intent to product/store workflows.',
        doneDetail: 'Voice tool selected.',
        kind: 'planner',
        durationMs: 650,
      },
      {
        label: 'Running voice tool',
        detail: 'Calling backend action and collecting UI payload.',
        doneDetail: 'Voice tool output ready.',
        kind: 'tool',
        durationMs: 900,
      },
      {
        label: 'Synthesizing summary',
        detail: 'Producing short speech-safe answer.',
        doneDetail: 'Final voice summary composed.',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
    marketing: [
      {
        label: 'Reading campaign brief',
        detail: 'Extracting tone, audience, and product context.',
        doneDetail: 'Campaign brief parsed.',
        kind: 'planner',
        durationMs: 700,
      },
      {
        label: 'Generating marketing assets',
        detail: 'Streaming copy and image enhancement instructions.',
        doneDetail: 'Marketing draft generated.',
        kind: 'tool',
        durationMs: 1200,
      },
      {
        label: 'Quality checks',
        detail: 'Verifying CTA clarity and consistency.',
        doneDetail: 'Draft passed validation.',
        kind: 'validator',
        durationMs: 550,
      },
      {
        label: 'Preparing showcase output',
        detail: 'Building final campaign cards and metadata.',
        doneDetail: 'Marketing output ready.',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
    invoice: [
      {
        label: 'Pre-processing invoice image',
        detail: 'Normalizing orientation and text contrast.',
        doneDetail: 'Image prepared for extraction.',
        kind: 'validator',
        durationMs: 700,
      },
      {
        label: 'Extracting structured fields',
        detail: 'Detecting invoice number, totals, and dates.',
        doneDetail: 'Invoice fields extracted.',
        kind: 'tool',
        durationMs: 1100,
      },
      {
        label: 'Verifying consistency',
        detail: 'Checking totals, currency, and item count.',
        doneDetail: 'Extraction validated.',
        kind: 'validator',
        durationMs: 650,
      },
      {
        label: 'Formatting result view',
        detail: 'Generating clean JSON + summary cards.',
        doneDetail: 'Invoice output rendered.',
        kind: 'renderer',
        durationMs: 500,
      },
    ],
    marketplace: [
      {
        label: 'Interpreting filters',
        detail: 'Parsing category, location, and price limits.',
        doneDetail: 'Search filters resolved.',
        kind: 'planner',
        durationMs: 650,
      },
      {
        label: 'Querying marketplace data',
        detail: 'Searching products and buyer/store entities.',
        doneDetail: 'Results retrieved.',
        kind: 'tool',
        durationMs: 950,
      },
      {
        label: 'Ranking matches',
        detail: 'Sorting by relevance and availability.',
        doneDetail: 'Top matches selected.',
        kind: 'validator',
        durationMs: 600,
      },
      {
        label: 'Composing answer',
        detail: 'Preparing concise brief with cards.',
        doneDetail: 'Marketplace summary ready.',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
  },
  'zh-TW': {
    chat: [
      {
        label: '理解使用者意圖',
        detail: '解析最新訊息與對話上下文。',
        doneDetail: '意圖與偏好操作已辨識。',
        kind: 'planner',
        durationMs: 600,
      },
      {
        label: '規劃工具路由',
        detail: '選擇最佳後端函式與參數組合。',
        doneDetail: '工具路徑與參數已準備。',
        kind: 'planner',
        durationMs: 700,
      },
      {
        label: '執行工具呼叫',
        detail: '執行商品、店家或統計操作。',
        doneDetail: '工具已回傳結構化資料。',
        kind: 'tool',
        durationMs: 900,
      },
      {
        label: '渲染回覆內容',
        detail: '整理精簡文字與卡片輸出。',
        doneDetail: '最終訊息與卡片已生成。',
        kind: 'renderer',
        durationMs: 500,
      },
    ],
    voice: [
      {
        label: '標準化語音轉寫',
        detail: '偵測語系並清理語音文字。',
        doneDetail: '語音文字已標準化。',
        kind: 'validator',
        durationMs: 600,
      },
      {
        label: '選擇語音工具',
        detail: '將口語意圖映射到商品/市集流程。',
        doneDetail: '語音工具已選定。',
        kind: 'planner',
        durationMs: 650,
      },
      {
        label: '執行語音工具',
        detail: '呼叫動作並收集 UI 載荷。',
        doneDetail: '語音工具輸出已就緒。',
        kind: 'tool',
        durationMs: 900,
      },
      {
        label: '合成語音摘要',
        detail: '產生簡短可口語播報的回覆。',
        doneDetail: '最終語音摘要已完成。',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
    marketing: [
      {
        label: '讀取行銷需求',
        detail: '擷取語氣、受眾與產品脈絡。',
        doneDetail: '活動需求解析完成。',
        kind: 'planner',
        durationMs: 700,
      },
      {
        label: '生成行銷素材',
        detail: '串流輸出文案與圖像增強指令。',
        doneDetail: '行銷草案已生成。',
        kind: 'tool',
        durationMs: 1200,
      },
      {
        label: '品質檢查',
        detail: '驗證 CTA 清晰度與內容一致性。',
        doneDetail: '草案通過檢查。',
        kind: 'validator',
        durationMs: 550,
      },
      {
        label: '封裝展示輸出',
        detail: '建立最終活動卡片與執行資訊。',
        doneDetail: '行銷輸出已就緒。',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
    invoice: [
      {
        label: '發票影像前處理',
        detail: '標準化方向與文字對比。',
        doneDetail: '影像已準備可供擷取。',
        kind: 'validator',
        durationMs: 700,
      },
      {
        label: '擷取結構化欄位',
        detail: '辨識發票號碼、金額與日期。',
        doneDetail: '發票欄位擷取完成。',
        kind: 'tool',
        durationMs: 1100,
      },
      {
        label: '一致性驗證',
        detail: '檢查總額、幣別與品項數。',
        doneDetail: '擷取結果驗證完成。',
        kind: 'validator',
        durationMs: 650,
      },
      {
        label: '格式化結果檢視',
        detail: '生成乾淨 JSON 與摘要卡片。',
        doneDetail: '發票輸出已渲染。',
        kind: 'renderer',
        durationMs: 500,
      },
    ],
    marketplace: [
      {
        label: '解析篩選條件',
        detail: '整理品類、地區與價格限制。',
        doneDetail: '搜尋條件已完成解析。',
        kind: 'planner',
        durationMs: 650,
      },
      {
        label: '查詢市集資料',
        detail: '搜尋商品與買家/店家實體。',
        doneDetail: '市集結果已取回。',
        kind: 'tool',
        durationMs: 950,
      },
      {
        label: '匹配結果排序',
        detail: '依相關性與可用性排序。',
        doneDetail: '已選出最佳匹配項目。',
        kind: 'validator',
        durationMs: 600,
      },
      {
        label: '組裝最終回覆',
        detail: '整理精簡摘要與結果卡片。',
        doneDetail: '市集摘要已就緒。',
        kind: 'renderer',
        durationMs: 450,
      },
    ],
  },
};

const QUICK_PROMPTS: Record<DemoLocale, Record<DemoTabId, string[]>> = {
  en: {
    chat: [
      'Add eggs for NT$120 / box, stock 30',
      'Show my latest products',
      'Create a store in Hsinchu for organic buyers',
    ],
    voice: [
      'Find products below 200',
      'Update egg stock to 48 boxes',
      'Open analytics for this week',
    ],
    marketing: [
      'Generate a fresh campaign for free-range eggs',
      'Create a weekend CTA with short hashtags',
      'Polish this product photo for e-commerce',
    ],
    invoice: [
      'Extract invoice fields and confidence',
      'Show invoice summary with line items',
      'Validate invoice totals and due date',
    ],
    marketplace: [
      'Search fruits in Taoyuan below 250',
      'Find nearby stores looking for eggs',
      'Show marketplace demand snapshot',
    ],
  },
  'zh-TW': {
    chat: ['新增雞蛋 120/盒 庫存30', '列出我的最新產品', '新增新竹有機買家店家'],
    voice: ['找 200 以下產品', '把雞蛋庫存改成 48 箱', '開啟本週分析'],
    marketing: ['幫我做放牧雞蛋促銷活動', '產生週末 CTA 與 Hashtag', '優化這張產品圖成電商風格'],
    invoice: ['抽取發票欄位與信心值', '顯示發票摘要與明細', '驗證總額與到期日'],
    marketplace: ['搜尋桃園 250 以下水果', '找附近想買雞蛋的店家', '顯示市集供需快照'],
  },
};

let sequence = 0;

function nextId(prefix: string): string {
  sequence += 1;
  return `${prefix}-${Date.now().toString(36)}-${sequence.toString(36)}`;
}

function nowLabel(): string {
  return new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' });
}

function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => {
    setTimeout(resolve, ms);
  });
}

function extractTopic(input: string): string {
  const trimmed = input.trim();
  if (!trimmed) return 'seasonal farm products';
  const chunk = trimmed.split(/\s+/).slice(0, 5).join(' ');
  return chunk || 'seasonal farm products';
}

function buildToolPayload(tab: DemoTabId, input: string, mode: DemoMode): Record<string, unknown> {
  const topic = extractTopic(input);
  const base = {
    request: topic,
    mode,
    latencyMs: Math.floor(620 + Math.random() * 330),
    tokens: Math.floor(280 + Math.random() * 150),
  };

  switch (tab) {
    case 'chat':
      return { ...base, toolName: 'product_search_public', resultCount: 4, nextAction: 'refine_filter' };
    case 'voice':
      return { ...base, toolName: 'product_update', updatedField: 'stock', followUp: 'confirm_changes' };
    case 'marketing':
      return { ...base, toolName: 'marketing_generate_stream', assets: ['headline', 'caption', 'cta', 'image'] };
    case 'invoice':
      return { ...base, toolName: 'invoice_scan', confidence: 0.93, fieldsExtracted: 11 };
    case 'marketplace':
      return { ...base, toolName: 'marketplace_get_stats', productsMatched: 6, storesMatched: 3 };
    default:
      return base;
  }
}

function buildCards(tab: DemoTabId, input: string, locale: DemoLocale): DemoCard[] {
  const topic = extractTopic(input);

  if (tab === 'marketing') {
    return [
      {
        title: locale === 'zh-TW' ? '活動主題' : 'Campaign Theme',
        subtitle: topic,
        tags: locale === 'zh-TW' ? ['新品曝光', '週末檔期', '社群貼文'] : ['launch', 'weekend', 'social'],
        actions: locale === 'zh-TW' ? ['複製文案', '開啟素材面板'] : ['Copy copy', 'Open assets panel'],
      },
      {
        title: locale === 'zh-TW' ? '成效預估' : 'Projected Impact',
        metrics: [
          { label: locale === 'zh-TW' ? '互動率' : 'Engagement', value: '+24%' },
          { label: locale === 'zh-TW' ? '點擊率' : 'CTR', value: '+11%' },
          { label: locale === 'zh-TW' ? '轉換率' : 'Conversion', value: '+7%' },
        ],
      },
    ];
  }

  if (tab === 'invoice') {
    return [
      {
        title: locale === 'zh-TW' ? '發票摘要' : 'Invoice Summary',
        subtitle: locale === 'zh-TW' ? '已抽取主要欄位' : 'Core fields extracted',
        metrics: [
          { label: locale === 'zh-TW' ? '總額' : 'Total', value: 'NT$ 12,860' },
          { label: locale === 'zh-TW' ? '稅額' : 'Tax', value: 'NT$ 643' },
          { label: locale === 'zh-TW' ? '信心值' : 'Confidence', value: '93%' },
        ],
        actions: locale === 'zh-TW' ? ['建立發票紀錄', '匯出 CSV'] : ['Create record', 'Export CSV'],
      },
    ];
  }

  if (tab === 'marketplace') {
    return [
      {
        title: locale === 'zh-TW' ? '放牧雞蛋' : 'Free-range Eggs',
        subtitle: locale === 'zh-TW' ? '新竹・可週配' : 'Hsinchu • weekly delivery',
        metrics: [
          { label: locale === 'zh-TW' ? '單價' : 'Price', value: locale === 'zh-TW' ? 'NT$ 118 / 盒' : 'NT$ 118 / box' },
          { label: locale === 'zh-TW' ? '庫存' : 'Stock', value: '42' },
        ],
        tags: [topic, locale === 'zh-TW' ? '熱門' : 'trending'],
      },
      {
        title: locale === 'zh-TW' ? '有機蔬菜組' : 'Organic Veg Pack',
        subtitle: locale === 'zh-TW' ? '桃園・當日採收' : 'Taoyuan • same-day harvest',
        metrics: [
          { label: locale === 'zh-TW' ? '單價' : 'Price', value: locale === 'zh-TW' ? 'NT$ 220 / 組' : 'NT$ 220 / set' },
          { label: locale === 'zh-TW' ? '庫存' : 'Stock', value: '18' },
        ],
      },
    ];
  }

  if (tab === 'voice') {
    return [
      {
        title: locale === 'zh-TW' ? '語音動作完成' : 'Voice Action Completed',
        subtitle: locale === 'zh-TW' ? '已套用您的口語指令' : 'Applied your spoken command',
        actions: locale === 'zh-TW' ? ['再次修改', '查看產品'] : ['Edit again', 'Open product'],
      },
    ];
  }

  return [
    {
      title: locale === 'zh-TW' ? '代理回覆摘要' : 'Agent Response Snapshot',
      subtitle: topic,
      metrics: [
        { label: locale === 'zh-TW' ? '路由' : 'Route', value: locale === 'zh-TW' ? '工具優先' : 'Tool-first' },
        { label: locale === 'zh-TW' ? '狀態' : 'Status', value: locale === 'zh-TW' ? '已完成' : 'Completed' },
      ],
      actions: locale === 'zh-TW' ? ['複製結果', '繼續追問'] : ['Copy result', 'Ask follow-up'],
    },
  ];
}

function buildPayload(tab: DemoTabId, locale: DemoLocale): Record<string, unknown> {
  if (tab === 'invoice') {
    return {
      provider: 'gemini',
      model: 'gemini-2.5-flash',
      invoice: {
        invoiceNumber: 'FTL-2026-0312-09',
        counterpartyName: locale === 'zh-TW' ? '新竹青禾食堂' : 'Qinghe Kitchen',
        issueDate: '2026-03-11',
        dueDate: '2026-03-25',
        currency: 'TWD',
        total: 12860,
        paid: 0,
      },
      confidence: 0.93,
    };
  }

  if (tab === 'marketing') {
    return {
      headline: locale === 'zh-TW' ? '新鮮直送，今天就吃到安心蛋' : 'Fresh from farm, on your shelf today',
      cta: locale === 'zh-TW' ? '立即預購本週產地直送' : 'Pre-order this week\'s harvest now',
      hashtags:
        locale === 'zh-TW'
          ? ['#產地直送', '#放牧雞蛋', '#Farm2Market']
          : ['#FarmFresh', '#DirectFromFarm', '#Farm2Market'],
    };
  }

  if (tab === 'marketplace') {
    return {
      query: locale === 'zh-TW' ? '市集商品搜尋' : 'Marketplace search',
      stats: {
        sellers: 62,
        buyers: 87,
        products: 426,
        stores: 198,
      },
      ranking: locale === 'zh-TW' ? '價格 + 庫存 + 地區' : 'price + stock + location',
    };
  }

  return {
    mode: tab,
    summary: locale === 'zh-TW' ? '已完成工具流程並輸出結果。' : 'Tool workflow completed and response generated.',
  };
}

function buildSummary(tab: DemoTabId, locale: DemoLocale, input: string): string {
  const topic = extractTopic(input);

  if (locale === 'zh-TW') {
    switch (tab) {
      case 'voice':
        return `已完成語音指令處理，並把「${topic}」轉成可執行動作。`;
      case 'marketing':
        return `行銷草案與素材已生成，主題聚焦在「${topic}」，可直接進行 A/B 測試。`;
      case 'invoice':
        return `發票欄位已抽取並完成一致性檢查，建議下一步可直接建立帳務紀錄。`;
      case 'marketplace':
        return `已完成市集搜尋與排序，先展示最符合「${topic}」條件的供應項目。`;
      default:
        return `流程已完成：我先做工具規劃，再回覆「${topic}」的可執行結果。`;
    }
  }

  switch (tab) {
    case 'voice':
      return `Voice command execution completed. "${topic}" was converted into an actionable workflow.`;
    case 'marketing':
      return `Marketing draft and assets are ready, tuned around "${topic}", and suitable for quick A/B testing.`;
    case 'invoice':
      return 'Invoice fields were extracted and validated. Next step can directly create an accounting record.';
    case 'marketplace':
      return `Marketplace search and ranking finished. Top matches for "${topic}" are now prioritized.`;
    default:
      return `Completed the full tool-first workflow and produced an actionable response for "${topic}".`;
  }
}

function buildTraceItem(
  template: WorkflowTemplate,
  status: TraceItem['status'],
  detail: string,
  payload?: Record<string, unknown>
): TraceItem {
  return {
    id: nextId('trace'),
    kind: template.kind,
    title: template.label,
    detail,
    status,
    payload,
    timestamp: nowLabel(),
  };
}

export function getQuickPrompts(tab: DemoTabId, locale: DemoLocale): string[] {
  return QUICK_PROMPTS[locale][tab];
}

export function buildWelcomeText(tab: DemoTabId, locale: DemoLocale): string {
  if (locale === 'zh-TW') {
    switch (tab) {
      case 'voice':
        return '語音代理已就緒。輸入一句口語指令，我會顯示推理進度與工具結果。';
      case 'marketing':
        return '行銷工作台已就緒。可測試文案、CTA 與圖片優化流程。';
      case 'invoice':
        return '發票 AI 已就緒。可展示 OCR 抽取與欄位驗證。';
      case 'marketplace':
        return '市集代理已就緒。可示範搜尋、排序與統計摘要。';
      default:
        return 'Farm2Market AI Demo 已就緒。輸入需求，我會顯示模型處理進度。';
    }
  }

  switch (tab) {
    case 'voice':
      return 'Voice agent is ready. Send a spoken-style command and watch live step tracking.';
    case 'marketing':
      return 'Marketing studio is ready. Test copy, CTA, and image-generation workflows.';
    case 'invoice':
      return 'Invoice AI is ready. Demonstrate OCR extraction and validation steps.';
    case 'marketplace':
      return 'Marketplace agent is ready. Demonstrate search, ranking, and stats summaries.';
    default:
      return 'Farm2Market AI Demo is ready. Send a request to see model progress in real time.';
  }
}

export async function runMockAgent(params: RunMockAgentParams): Promise<MockAgentResult> {
  const { tab, input, locale, mode, onStepStatus, onTrace, onWorkflowInit } = params;
  const workflow = WORKFLOWS[locale][tab];
  const steps: ProgressStep[] = workflow.map((item, index) => ({
    id: `step-${index + 1}`,
    label: item.label,
    detail: item.detail,
    status: 'pending',
  }));

  onWorkflowInit(steps);

  for (let index = 0; index < workflow.length; index += 1) {
    const template = workflow[index];
    const stepId = steps[index].id;

    onStepStatus(stepId, 'in_progress', template.detail);
    onTrace(buildTraceItem(template, 'running', template.detail));

    await sleep(template.durationMs);

    const payload = template.kind === 'tool' ? buildToolPayload(tab, input, mode) : undefined;
    onStepStatus(stepId, 'completed', template.doneDetail);
    onTrace(buildTraceItem(template, 'ok', template.doneDetail, payload));
  }

  return {
    summary: buildSummary(tab, locale, input),
    cards: buildCards(tab, input, locale),
    payload: buildPayload(tab, locale),
  };
}