import type { MindSpaceChatContext } from '../types';

export type AgentRunCreateOptions = {
  toolMode?: 'chat' | 'code';
  taskType?: string | null;
  forceDeepReasoning?: boolean;
  validation?: AgentRunValidation | null;
  validationInstruction?: string | null;
  selectedAssetIds?: string[];
};

export type AgentRunValidationFile = {
  path: string;
  contains?: string;
};

export type AgentRunValidation = {
  expectedFile?: AgentRunValidationFile | string;
  expectedFiles?: Array<AgentRunValidationFile | string>;
};

function envFlag(value: unknown): boolean {
  const normalized = String(value ?? '').trim().toLowerCase();
  return ['1', 'true', 'yes', 'on'].includes(normalized);
}

export const agentCodeRunsEnabled = envFlag(import.meta.env.VITE_AGENT_CODE_RUNS_ENABLED);
export const agentCodeRunsAutodetectEnabled = envFlag(
  import.meta.env.VITE_AGENT_CODE_RUNS_AUTODETECT,
);

function parseUserIdSet(value: unknown): Set<string> {
  return new Set(
    String(value ?? '')
      .split(',')
      .map((item) => item.trim())
      .filter(Boolean),
  );
}

const agentCodeRunUserIds = parseUserIdSet(import.meta.env.VITE_AGENT_CODE_RUNS_USER_IDS);

export function agentCodeRunsEnabledForUser(userId?: string | null): boolean {
  if (!agentCodeRunsEnabled) return false;
  if (agentCodeRunUserIds.size === 0) return true;
  return Boolean(userId && agentCodeRunUserIds.has(userId));
}

const CODE_TASK_PATTERNS = [
  /\b(repo|repository|branch|commit|pull request|pr|diff|patch)\b/i,
  /\b(aider|openhands|codex|codebase|workspace)\b/i,
  /\b(refactor|debug|fix bug|implement|add test|unit test)\b/i,
  /(修改|修复|重构|调试|实现|新增|编写|更新).{0,12}(代码|仓库|分支|文件|测试|组件|接口)/,
  /(代码|仓库|项目|文件|组件|接口).{0,12}(修改|修复|重构|调试|实现|新增|编写|更新)/,
];

const DEEP_REASONING_TASK_PATTERNS = [
  /\b(public\/[^\s"'<>]+\.html)\b/i,
  /\b(html|h5|web\s?page|landing\s?page|microsite|docx|word)\b/i,
  /\b(write|create|generate|publish|download|export|save|edit)\b.{0,40}\b(file|page|html|docx|word|asset)\b/i,
  /\b(file|page|html|docx|word|asset)\b.{0,40}\b(write|create|generate|publish|download|export|save|edit)\b/i,
  /(?:生成|创建|制作|做|写|设计|发布|导出|下载|保存|修改|编辑).{0,24}(?:页面|网页|HTML|html|H5|h5|文件|文档|Word|word|docx|下载页|公开页|分享页|落地页|活动页)/u,
  /(?:页面|网页|HTML|html|H5|h5|文件|文档|Word|word|docx|下载页|公开页|分享页|落地页|活动页).{0,24}(?:生成|创建|制作|做|写|设计|发布|导出|下载|保存|修改|编辑)/u,
  /MindSpace\/[^/\s]+\/public\/[^\s"'<>]+\.html/i,
];

function sanitizeRequestIdForPath(requestId: string): string {
  const normalized = String(requestId ?? '').trim().replace(/[^a-zA-Z0-9._-]/g, '-');
  return normalized || 'unknown-request';
}

function normalizeExpectedFile(value: AgentRunValidationFile | string): AgentRunValidationFile | null {
  if (typeof value === 'string') {
    const path = value.trim();
    return path ? { path } : null;
  }
  const path = String(value?.path ?? '').trim();
  if (!path) return null;
  return {
    path,
    ...(value.contains == null ? {} : { contains: String(value.contains) }),
  };
}

function mergeAgentRunValidationFiles(
  ...items: Array<AgentRunValidation | AgentRunValidationFile | string | null | undefined>
): AgentRunValidation | null {
  const byKey = new Map<string, AgentRunValidationFile>();
  const addFile = (file: AgentRunValidationFile | string | null | undefined) => {
    if (!file) return;
    const normalized = normalizeExpectedFile(file);
    if (!normalized) return;
    const key = `${normalized.path}\u0000${normalized.contains ?? ''}`;
    byKey.set(key, normalized);
  };

  for (const item of items) {
    if (!item) continue;
    if (typeof item === 'string' || 'path' in item) {
      addFile(item);
      continue;
    }
    addFile(item.expectedFile);
    for (const file of item.expectedFiles ?? []) addFile(file);
  }

  const expectedFiles = [...byKey.values()];
  return expectedFiles.length ? { expectedFiles } : null;
}

export function normalizeAgentRunPublicHtmlPath(candidate: string): string | null {
  const decoded = decodeURIComponent(String(candidate ?? '')).replace(/\\/g, '/').trim();
  const publicMatch = decoded.match(/(?:^|\/)(public\/[^"'<>?#\s]+\.html)\b/i);
  const raw = publicMatch?.[1] ?? '';
  if (!raw) return null;
  const parts = raw
    .split('/')
    .map((part) => part.trim())
    .filter(Boolean);
  if (parts.length < 2 || parts[0] !== 'public') return null;
  if (parts.some((part) => part === '.' || part === '..')) return null;
  return parts.join('/');
}

export function extractAgentRunPublicHtmlPaths(...values: Array<string | null | undefined>): string[] {
  const found = new Set<string>();
  const pattern = /(?:^|[\s"'([{<])((?:https?:\/\/[^\s"'<>]+|\/?MindSpace\/[^\s"'<>]+|public\/[^\s"'<>]+)\.html)\b/gi;
  for (const value of values) {
    const text = String(value ?? '');
    let match: RegExpExecArray | null;
    while ((match = pattern.exec(text))) {
      const path = normalizeAgentRunPublicHtmlPath(match[1] ?? '');
      if (path) found.add(path);
    }
  }
  return [...found];
}

export function buildAgentRunTaskValidation({
  requestId,
  taskType,
  text,
  mindspaceContext,
  pageEdit,
}: {
  requestId: string;
  taskType: string;
  text: string;
  mindspaceContext?: MindSpaceChatContext | null;
  pageEdit?: { pageId?: string | null; pageTitle?: string | null } | null;
}): { validation: AgentRunValidation | null; instruction: string } {
  const safeRequestId = sanitizeRequestIdForPath(requestId);
  const pageId = String(pageEdit?.pageId ?? mindspaceContext?.page?.id ?? '').trim();
  const pageTitle = String(pageEdit?.pageTitle ?? mindspaceContext?.page?.title ?? '').trim();
  const publicHtmlPaths = extractAgentRunPublicHtmlPaths(
    text,
    mindspaceContext?.page?.publicationUrl ?? null,
  );
  const expectedFiles: AgentRunValidationFile[] = publicHtmlPaths.map((path) => ({ path }));
  const instructions: string[] = [];

  if (publicHtmlPaths.length > 0) {
    instructions.push(
      '',
      '[Memind task artifact validation]',
      'The task references concrete MindSpace public HTML artifacts.',
      'Before finishing, ensure these workspace-relative files exist and contain the intended result:',
      ...publicHtmlPaths.map((path) => `- ${path}`),
    );
  }

  if (taskType === 'page_edit_code_task' && pageId) {
    const taskReceiptPath = `.memind/agent-runs/${safeRequestId}-page-edit.json`;
    expectedFiles.push({ path: taskReceiptPath, contains: pageId });
    instructions.push(
      '',
      '[Memind page-edit validation]',
      `Before finishing this page-edit task, create or update ${taskReceiptPath}.`,
      'The file must be valid JSON and include:',
      `- requestId: ${requestId}`,
      `- taskType: ${taskType}`,
      `- pageId: ${pageId}`,
      ...(pageTitle ? [`- pageTitle: ${pageTitle}`] : []),
      '- a brief summary of the page changes or the reason no change was needed.',
    );
  }

  return {
    validation: expectedFiles.length ? { expectedFiles } : null,
    instruction: instructions.join('\n'),
  };
}

export function buildAgentRunValidationReceipt(requestId: string): {
  validation: AgentRunValidation;
  instruction: string;
} {
  const normalizedRequestId = String(requestId ?? '').trim();
  const safeRequestId = sanitizeRequestIdForPath(normalizedRequestId);
  const receiptPath = `.memind/agent-runs/${safeRequestId}.json`;
  const marker = normalizedRequestId || safeRequestId;
  return {
    validation: {
      expectedFile: {
        path: receiptPath,
        contains: marker,
      },
    },
    instruction: [
      '',
      '[Memind code-run validation]',
      `Before finishing, create or update ${receiptPath}.`,
      `The file must be valid JSON and include this requestId value: ${marker}.`,
      'Do not skip this receipt even if the user task itself is complete.',
    ].join('\n'),
  };
}

export function resolveAgentRunOptions(
  text: string,
  {
    taskType = 'code_task',
    forceCode = false,
    allowAutodetect = agentCodeRunsAutodetectEnabled,
    userId = null,
    requestId = null,
    mindspaceContext = null,
    pageEdit = null,
  }: {
    taskType?: string;
    forceCode?: boolean;
    allowAutodetect?: boolean;
    userId?: string | null;
    requestId?: string | null;
    mindspaceContext?: MindSpaceChatContext | null;
    pageEdit?: { pageId?: string | null; pageTitle?: string | null } | null;
  } = {},
): AgentRunCreateOptions {
  const normalizedText = String(text ?? '').trim();
  const shouldUseDeepReasoning =
    forceCode || DEEP_REASONING_TASK_PATTERNS.some((pattern) => pattern.test(normalizedText));

  if (!agentCodeRunsEnabledForUser(userId)) {
    return shouldUseDeepReasoning ? { forceDeepReasoning: true, taskType } : {};
  }

  const shouldUseCode = forceCode || (allowAutodetect && CODE_TASK_PATTERNS.some((pattern) => pattern.test(normalizedText)));
  if (!shouldUseCode) {
    return shouldUseDeepReasoning ? { forceDeepReasoning: true, taskType } : {};
  }
  const normalizedRequestId = requestId ?? crypto.randomUUID();
  const receipt = buildAgentRunValidationReceipt(normalizedRequestId);
  const taskValidation = buildAgentRunTaskValidation({
    requestId: normalizedRequestId,
    taskType,
    text: normalizedText,
    mindspaceContext,
    pageEdit,
  });
  return {
    toolMode: 'code',
    taskType,
    forceDeepReasoning: true,
    validation: mergeAgentRunValidationFiles(receipt.validation, taskValidation.validation),
    validationInstruction: `${receipt.instruction}${taskValidation.instruction}`,
  };
}