import { buildMindSpacePageSaveInstructions } from './mindspace-page-patch.mjs';
import {
  buildSelectedAssetDeleteInstructions,
  buildSelectedAssetReadInstructions,
} from './mindspace-asset-agent-instructions.mjs';

const VIEW_LABELS = {
  home: '空间首页',
  category: '分类列表',
  page: '页面详情',
};

const STATUS_LABELS = {
  draft: '草稿',
  reviewing: '待检查',
  risk_found: '发现风险',
  ready: '可发布',
  published: '已公开',
  protected: '受保护',
  expired: '已过期',
  offline: '已下线',
};

const TEMPLATE_LABELS = {
  editorial: '编辑长文',
  report: '分析报告',
  'knowledge-card': '知识卡片',
  profile: '个人介绍',
  'static-html': '静态 HTML',
};

const CONTENT_EXCERPT_LIMIT = 1800;
const ASSET_PREVIEW_LIMIT = 10;

function stripHtml(value) {
  return String(value ?? '')
    .replace(/<script[\s\S]*?<\/script>/gi, ' ')
    .replace(/<style[\s\S]*?<\/style>/gi, ' ')
    .replace(/<[^>]+>/g, ' ')
    .replace(/\s+/g, ' ')
    .trim();
}

function excerptContent(content, contentFormat, max = CONTENT_EXCERPT_LIMIT) {
  const raw = String(content ?? '').trim();
  if (!raw) return '';
  const text = contentFormat === 'html' ? stripHtml(raw) : raw;
  if (text.length <= max) return text;
  return `${text.slice(0, max - 1)}…`;
}

function resolveCategory(space, selectedCategory, page) {
  if (selectedCategory) return selectedCategory;
  if (!page?.categoryCode) return null;
  return space.categories?.find((item) => item.code === page.categoryCode) ?? null;
}

function resolvePageRecord(selectedPageId, pages, pageLive) {
  const listed = selectedPageId ? pages.find((item) => item.id === selectedPageId) : undefined;
  if (!pageLive) return listed;
  return {
    ...(listed ?? {}),
    ...pageLive.page,
    title: pageLive.title,
    summary: pageLive.summary,
    content: pageLive.content,
  };
}

function normalizeWorkspaceRelativePath(value) {
  const trimmed = String(value ?? '').trim().replace(/^\.?\//, '');
  if (!trimmed || trimmed.includes('..')) return null;
  return trimmed;
}

function normalizeSelectedAsset(asset) {
  if (!asset?.id) return null;
  const workspaceRelativePath = normalizeWorkspaceRelativePath(
    asset.workspaceRelativePath ?? asset.workspace_relative_path,
  );
  return {
    id: asset.id,
    displayName: asset.displayName ?? asset.filename ?? asset.id,
    mimeType: asset.mimeType ?? 'application/octet-stream',
    ...(asset.filename ? { filename: asset.filename } : {}),
    ...(typeof asset.sizeBytes === 'number' ? { sizeBytes: asset.sizeBytes } : {}),
    ...(asset.categoryCode ? { categoryCode: asset.categoryCode } : {}),
    ...(asset.assetType ? { assetType: asset.assetType } : {}),
    ...(workspaceRelativePath ? { workspaceRelativePath } : {}),
  };
}

function resolveCategoryItemCount(category, view, assets) {
  const listed = typeof category?.itemCount === 'number' ? category.itemCount : 0;
  if (view !== 'category' || !Array.isArray(assets) || assets.length === 0) {
    return category?.itemCount;
  }
  return Math.max(listed, assets.length);
}

function inferAssetKindLabel(asset) {
  const mime = String(asset?.mimeType ?? '').toLowerCase();
  const name = String(asset?.displayName ?? asset?.filename ?? '').toLowerCase();
  if (mime.startsWith('image/')) return '图片';
  if (
    mime.includes('spreadsheet') ||
    mime.includes('csv') ||
    name.endsWith('.xlsx') ||
    name.endsWith('.xls') ||
    name.endsWith('.csv')
  ) {
    return '数据表';
  }
  if (mime.includes('pdf') || name.endsWith('.pdf')) return '报告';
  if (mime.includes('word') || name.endsWith('.doc') || name.endsWith('.docx')) return '文档';
  if (mime.startsWith('text/')) return '文本资料';
  return '文件';
}

function buildSelectedAssetInstructions(context) {
  const selected = context.selectedAssets ?? [];
  if (selected.length === 0) return [];

  const lines = ['【界面勾选资料（硬性）】'];
  if (selected.length === 1) {
    const asset = selected[0];
    const kind = inferAssetKindLabel(asset);
    const workspacePath = normalizeWorkspaceRelativePath(
      asset.workspaceRelativePath ?? asset.workspace_relative_path,
    );
    lines.push(
      `- 用户在界面勾选了 1 份${kind}：「${asset.displayName}」（id: ${asset.id}，${asset.mimeType}）`,
      '- 用户说「这个 / 这份 / 这篇 / 这份报告 / 这个数据 / 帮我分析 / 帮我删除」等指代词时，**必须**指这份勾选资料，不得猜测其它文件。',
      workspacePath
        ? `- 读取/分析：文件已落盘 \`${workspacePath}\`，直接 read/脚本读取；见下方「勾选资料读取」。`
        : '- 读取/分析：优先 `list_dir oa` / `read_file oa/文件名`；若工作区尚无副本，见下方「勾选资料读取」用 Agent 代理下载落盘。',
      '- 删除：须先与用户确认，确认后由你直接执行删除（见下方「勾选资料删除」）；你对该用户空间有完整读写删改权限，**禁止**推给用户自行去界面删除。',
    );
    if (context.h5ApiBase) {
      lines.push(`- H5 API 基址：${context.h5ApiBase}`);
    }
  } else {
    lines.push(`- 用户在界面同时勾选了 ${selected.length} 份资料：`);
    for (const asset of selected) {
      lines.push(`  · 「${asset.displayName}」（id: ${asset.id}，${asset.mimeType}）`);
    }
    lines.push(
      '- 用户说「这个 / 这份」等指代词时，**必须先追问**要处理哪一份，不得擅自选一份执行。',
      '- 不要主动对多选资料发起默认操作；等用户明确指定后再执行。',
    );
  }
  lines.push('');
  return lines;
}

export function buildSelectedAssetGreeting(asset) {
  const kind = inferAssetKindLabel(asset);
  const name = asset.displayName ?? asset.filename ?? '这份资料';
  return `我看到你在界面里勾选了「${name}」。你是想查看或处理这份${kind}吗？可以直接说「帮我分析」「总结一下」或「帮我删除」——确认后我可以直接在这份${kind}上操作（含删除）。`;
}

export function buildMindSpaceChatContext(input) {
  const {
    space,
    ownerUsername,
    selectedCategory,
    selectedPageId,
    pages = [],
    pageLive = null,
    assets = [],
    selectedAssets = [],
    focusedAsset = null,
    route,
    agentSessionId = null,
    h5ApiBase = null,
    pageEditMode = false,
    parentAgentSessionId = null,
  } = input;

  const pageRecord = resolvePageRecord(selectedPageId, pages, pageLive);
  const category = resolveCategory(space, selectedCategory, pageRecord);

  let view = 'home';
  if (pageRecord && selectedPageId) view = 'page';
  else if (selectedCategory) view = 'category';

  const normalizedSelected = selectedAssets
    .map((asset) => normalizeSelectedAsset(asset))
    .filter(Boolean);
  const resolvedFocus =
    normalizedSelected.length === 1
      ? normalizedSelected[0]
      : normalizeSelectedAsset(focusedAsset);

  const context = {
    spaceId: space.id,
    spaceName: space.name,
    view,
    route,
    ...(ownerUsername ? { ownerUsername } : {}),
    ...(agentSessionId ? { agentSessionId } : {}),
    ...(h5ApiBase ? { h5ApiBase } : {}),
    ...(pageEditMode ? { pageEditMode: true } : {}),
    ...(parentAgentSessionId ? { parentAgentSessionId } : {}),
    ...(category
      ? {
          category: {
            code: category.code,
            name: category.name,
            itemCount: resolveCategoryItemCount(category, view, assets),
            ...(view === 'category' && assets.length
              ? {
                  assets: assets.slice(0, ASSET_PREVIEW_LIMIT).map((asset) => ({
                    id: asset.id,
                    displayName: asset.displayName,
                    mimeType: asset.mimeType,
                  })),
                }
              : {}),
          },
        }
      : {}),
    ...(pageRecord && selectedPageId
      ? {
          page: {
            id: pageRecord.id,
            title: pageLive?.title ?? pageRecord.title,
            summary: pageLive?.summary ?? pageRecord.summary ?? '',
            status: pageRecord.status,
            versionNo: pageRecord.versionNo,
            categoryCode: pageRecord.categoryCode,
            templateId: pageRecord.templateId,
            contentFormat: pageRecord.contentFormat ?? 'markdown',
            pageType: pageRecord.pageType,
            contentExcerpt: excerptContent(
              pageLive?.content ?? pageRecord.content ?? '',
              pageRecord.contentFormat ?? 'markdown',
            ),
            publicationUrl: pageRecord.publication?.publicUrl ?? null,
          },
        }
      : {}),
    ...(resolvedFocus
      ? {
          focusedAsset: resolvedFocus,
        }
      : {}),
    ...(normalizedSelected.length
      ? {
          selectedAssets: normalizedSelected,
        }
      : {}),
  };

  if (view === 'home' && space.categories?.length) {
    context.homeCategories = space.categories.map((item) => ({
      code: item.code,
      name: item.name,
      itemCount: item.itemCount,
    }));
  }

  if (view === 'home' && pages.length) {
    const recentPages = [...pages].sort((left, right) => {
      const createdDiff = (right.createdAt ?? 0) - (left.createdAt ?? 0);
      if (createdDiff !== 0) return createdDiff;
      return (right.updatedAt ?? 0) - (left.updatedAt ?? 0);
    });
    context.recentPages = recentPages.slice(0, 8).map((item) => ({
      id: item.id,
      title: item.title,
      status: item.status,
      categoryCode: item.categoryCode,
    }));
  }

  return context;
}

function buildLocationHint(context) {
  if (context.page) {
    return `用户正在查看/编辑页面「${context.page.title}」（id: ${context.page.id}）。指代「这个页面」「改这里」时默认指该页面。`;
  }
  if (context.selectedAssets?.length === 1) {
    const asset = context.selectedAssets[0];
    const kind = inferAssetKindLabel(asset);
    return `用户在界面勾选了${kind}「${asset.displayName}」（id: ${asset.id}）。指代「这个文件」「这份报告」「这个数据」时**必须**指该勾选资料。`;
  }
  if (context.selectedAssets?.length > 1) {
    return `用户在界面同时勾选了 ${context.selectedAssets.length} 份资料。指代「这个 / 这份」时必须先让用户说明要处理哪一份。`;
  }
  if (context.focusedAsset) {
    return `用户正在处理资料「${context.focusedAsset.displayName}」（id: ${context.focusedAsset.id}）。指代「这个文件」「这份资料」时默认指该资产。`;
  }
  if (context.category) {
    return `用户正在「${context.category.name}」分类中浏览。指代「这里的文件」时默认指该分类下的资料。`;
  }
  return '用户在 MindSpace 空间首页。指代「我的空间」时指整个个人空间。';
}

export function buildPageEditSubAgentInstructions(context) {
  const pageTitle = context.page?.title ?? '当前页面';
  const lines = [
    '【页面编辑子 Agent（硬性）】',
    `- 你是专注修改页面「${pageTitle}」的子 Agent，用户正在全屏预览中编辑。`,
    '- 只做页面内容/标题/样式修改，不要跑题，不要 delegate / load_skill / 改其它文件。',
    '- 每次完成一处修改后必须让预览立刻更新（见下方页面实时修改说明）。',
  ];
  if (context.parentAgentSessionId) {
    lines.push(`- 父对话 session：${context.parentAgentSessionId}（退出预览后摘要会合并回父对话记忆）。`);
  }
  lines.push('');
  return lines.join('\n');
}

export function buildContextPrefix(context) {
  const lines = [];
  if (context.pageEditMode) {
    lines.push(...buildPageEditSubAgentInstructions(context).split('\n'));
  }
  lines.push(
    '[MindSpace 上下文]',
    `- 空间：${context.spaceName}（id: ${context.spaceId}）`,
  );

  if (context.ownerUsername) {
    lines.push(`- 账号：${context.ownerUsername}`);
  }

  lines.push(`- 当前视图：${VIEW_LABELS[context.view]}`);

  if (context.category) {
    const count =
      typeof context.category.itemCount === 'number'
        ? `，共 ${context.category.itemCount} 项`
        : '';
    lines.push(`- 分类：${context.category.name}（${context.category.code}${count}）`);
    if (context.category.assets?.length) {
      lines.push('- 当前分类资料（节选）：');
      for (const asset of context.category.assets) {
        lines.push(`  · ${asset.displayName}（id: ${asset.id}，${asset.mimeType}）`);
      }
    }
  }

  if (context.page) {
    lines.push(`- 页面：${context.page.title}（id: ${context.page.id}）`);
    if (context.page.categoryCode) {
      lines.push(`- 页面所属分类：${context.page.categoryCode}`);
    }
    if (context.page.status) {
      lines.push(
        `- 页面状态：${STATUS_LABELS[context.page.status] ?? context.page.status}`,
      );
    }
    if (typeof context.page.versionNo === 'number') {
      lines.push(`- 页面版本：v${context.page.versionNo}`);
    }
    if (context.page.templateId) {
      lines.push(
        `- 页面模板：${TEMPLATE_LABELS[context.page.templateId] ?? context.page.templateId}`,
      );
    }
    if (context.page.contentFormat) {
      lines.push(`- 内容格式：${context.page.contentFormat}`);
    }
    if (context.page.summary?.trim()) {
      lines.push(`- 页面摘要：${context.page.summary.trim()}`);
    }
    if (context.page.workspacePublicUrl) {
      lines.push(`- 公开地址（MindSpace）：${context.page.workspacePublicUrl}`);
    } else if (context.page.publicationUrl) {
      lines.push(`- 公开地址：${context.page.publicationUrl}`);
    }
    if (context.page.contentExcerpt) {
      lines.push('- 当前正文摘录（供直接修改参考）：');
      lines.push('"""');
      lines.push(context.page.contentExcerpt);
      lines.push('"""');
    }
    lines.push(...buildMindSpacePageSaveInstructions(context.page, {
      sessionId: context.agentSessionId,
      h5ApiBase: context.h5ApiBase,
    }));
  }

  if (context.focusedAsset) {
    lines.push(
      `- 当前聚焦资料：${context.focusedAsset.displayName}（${context.focusedAsset.mimeType}，id: ${context.focusedAsset.id}）`,
    );
  }

  lines.push(...buildSelectedAssetInstructions(context));
  lines.push(...buildSelectedAssetReadInstructions(context));
  lines.push(...buildSelectedAssetDeleteInstructions(context));

  if (context.homeCategories?.length) {
    lines.push('- 空间分类概览：');
    for (const item of context.homeCategories) {
      lines.push(`  · ${item.name}（${item.code}，${item.itemCount ?? 0} 项）`);
    }
  }

  if (context.recentPages?.length) {
    lines.push('- 最近页面（节选）：');
    for (const item of context.recentPages) {
      lines.push(`  · ${item.title}（id: ${item.id}，${item.categoryCode}，${item.status}）`);
    }
  }

  lines.push(`- 路径：${context.route}`);
  lines.push('');
  lines.push('【定位说明】');
  lines.push(buildLocationHint(context));
  lines.push('');
  lines.push('---');
  lines.push('');
  return `${lines.join('\n')}\n`;
}

export function formatContextChip(context) {
  if (context.pageEditMode && context.page) {
    const version =
      typeof context.page.versionNo === 'number' ? ` · v${context.page.versionNo}` : '';
    return `编辑 · ${context.page.title}${version}`;
  }
  if (context.selectedAssets?.length === 1) {
    return `已选 · ${context.selectedAssets[0].displayName}`;
  }
  if (context.selectedAssets?.length > 1) {
    return `已选 ${context.selectedAssets.length} 项资料`;
  }
  if (context.page) {
    const version =
      typeof context.page.versionNo === 'number' ? ` · v${context.page.versionNo}` : '';
    return `${context.page.title}${version}`;
  }
  if (context.category) {
    const count =
      typeof context.category.itemCount === 'number' ? ` · ${context.category.itemCount} 项` : '';
    return `${context.category.name}${count}`;
  }
  return context.spaceName;
}

export const mindspaceChatContextInternals = {
  stripHtml,
  excerptContent,
  inferAssetKindLabel,
  normalizeSelectedAsset,
};