import {
  isGenericPageGenerationRequest,
  isPageGenerationIntent,
} from './chat-skills.mjs';
import {
  cursorExecutorEnabled,
  resolvePreferredCodeExecutor,
} from './cursor-agent-launch.mjs';
import { enforcePageGenerationCursorRuntime } from './cursor-page-routing.mjs';

function envFlag(value, fallback = false) {
  const raw = String(value ?? '').trim().toLowerCase();
  if (!raw) return fallback;
  return ['1', 'true', 'yes', 'on'].includes(raw);
}

export function cursorPageTimeoutTakeoverEnabled(env = process.env) {
  return envFlag(env.MEMIND_CURSOR_PAGE_TIMEOUT_TAKEOVER, false);
}

function extractRunDisplayText(row) {
  const message = row?.user_message_json;
  const parsed = typeof message === 'string'
    ? (() => {
      try {
        return JSON.parse(message);
      } catch {
        return {};
      }
    })()
    : (message ?? {});
  const displayText = String(parsed?.metadata?.displayText ?? '').trim();
  if (displayText) return displayText;
  const content = parsed?.content;
  if (typeof content === 'string') return content.trim();
  if (Array.isArray(content)) {
    return content
      .filter((item) => item?.type === 'text')
      .map((item) => String(item.text ?? '').trim())
      .filter(Boolean)
      .join('\n')
      .trim();
  }
  return '';
}

function getRunOptionsFromMessage(userMessage) {
  const metadata = userMessage?.metadata;
  const runMetadata = metadata?.memindRun ?? metadata?.agentRun ?? {};
  return {
    toolMode: String(runMetadata?.toolMode ?? metadata?.toolMode ?? 'chat').trim().toLowerCase(),
    taskType: runMetadata?.taskType ?? metadata?.taskType ?? null,
    forceDeepReasoning: runMetadata?.forceDeepReasoning === true || metadata?.forceDeepReasoning === true,
  };
}

function cursorExecutorAvailable(toolGatewayStatus, env = process.env) {
  if (!cursorExecutorEnabled(env)) return false;
  if (resolvePreferredCodeExecutor(env) !== 'cursor') return false;
  if (!toolGatewayStatus?.enabled) return false;
  const executors = Array.isArray(toolGatewayStatus.executors)
    ? toolGatewayStatus.executors.map((item) => String(item).trim().toLowerCase())
    : [];
  return executors.includes('cursor');
}

export function shouldRetryPageGenerationWithCursor({
  row,
  error = null,
  toolGatewayStatus = null,
  env = process.env,
} = {}) {
  if (!cursorPageTimeoutTakeoverEnabled(env)) return false;
  if (String(error?.code ?? '') !== 'AGENT_RUN_TIMEOUT') return false;
  if (!cursorExecutorAvailable(toolGatewayStatus, env)) return false;

  const userMessage = typeof row?.user_message_json === 'string'
    ? (() => {
      try {
        return JSON.parse(row.user_message_json);
      } catch {
        return {};
      }
    })()
    : (row?.user_message_json ?? {});
  const runMetadata = userMessage?.metadata?.memindRun ?? userMessage?.metadata?.agentRun ?? {};
  if (runMetadata.pageCursorDefault === true || runMetadata.cursorTimeoutTakeover === true) {
    return false;
  }
  if (String(runMetadata.requiredExecutor ?? runMetadata.executor ?? '').trim().toLowerCase() === 'cursor') {
    return false;
  }

  const taskText = extractRunDisplayText(row);
  if (!isPageGenerationIntent(taskText) || isGenericPageGenerationRequest(taskText)) {
    return false;
  }
  return true;
}

export function buildCursorPageTimeoutTakeover(row, { env = process.env } = {}) {
  const userMessage = typeof row?.user_message_json === 'string'
    ? (() => {
      try {
        return JSON.parse(row.user_message_json);
      } catch {
        return {};
      }
    })()
    : (row?.user_message_json ?? {});
  const runOptions = getRunOptionsFromMessage(userMessage);
  const enforced = enforcePageGenerationCursorRuntime(userMessage, {
    rawToolMode: runOptions.toolMode,
    taskType: runOptions.taskType,
    forceDeepReasoning: runOptions.forceDeepReasoning ?? true,
    env,
    channelEligible: true,
    policy: null,
  });
  if (!enforced.requiredExecutor) return null;

  const metadata = enforced.userMessage?.metadata ?? {};
  const memindRun = metadata.memindRun ?? {};
  const updatedMessage = {
    ...enforced.userMessage,
    metadata: {
      ...metadata,
      memindRun: {
        ...memindRun,
        cursorTimeoutTakeover: true,
      },
    },
  };
  return {
    userMessage: updatedMessage,
    runOptions: {
      toolMode: enforced.rawToolMode,
      taskType: enforced.taskType,
      forceDeepReasoning: enforced.forceDeepReasoning,
      requiredExecutor: enforced.requiredExecutor,
    },
  };
}

export function resolveCursorPageTimeoutTakeover(input) {
  if (!shouldRetryPageGenerationWithCursor(input)) return null;
  return buildCursorPageTimeoutTakeover(input.row, { env: input.env });
}