import React, { useCallback, useEffect, useState } from 'react';
import { useSettings } from '~/lib/hooks/useSettings';
import commit from '~/commit.json';

interface ProviderStatus {
  name: string;
  enabled: boolean;
  isLocal: boolean;
  isRunning: boolean | null;
  error?: string;
  lastChecked: Date;
  responseTime?: number;
  url: string | null;
}

interface SystemInfo {
  os: string;
  browser: string;
  screen: string;
  language: string;
  timezone: string;
  memory: string;
  cores: number;
}

interface IProviderConfig {
  name: string;
  settings: {
    enabled: boolean;
  };
}

const LOCAL_PROVIDERS = ['Ollama', 'LMStudio', 'OpenAILike'];
const versionHash = commit.commit;
const GITHUB_URLS = {
  original: 'https://api.github.com/repos/stackblitz-labs/bolt.diy/commits/main',
  fork: 'https://api.github.com/repos/Stijnus/bolt.new-any-llm/commits/main',
};

function getSystemInfo(): SystemInfo {
  const formatBytes = (bytes: number): string => {
    if (bytes === 0) {
      return '0 Bytes';
    }

    const k = 1024;
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));

    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
  };

  return {
    os: navigator.platform,
    browser: navigator.userAgent.split(' ').slice(-1)[0],
    screen: `${window.screen.width}x${window.screen.height}`,
    language: navigator.language,
    timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
    memory: formatBytes(performance?.memory?.jsHeapSizeLimit || 0),
    cores: navigator.hardwareConcurrency || 0,
  };
}

const checkProviderStatus = async (url: string | null, providerName: string): Promise<ProviderStatus> => {
  if (!url) {
    console.log(`[Debug] No URL provided for ${providerName}`);
    return {
      name: providerName,
      enabled: false,
      isLocal: true,
      isRunning: false,
      error: 'No URL configured',
      lastChecked: new Date(),
      url: null,
    };
  }

  console.log(`[Debug] Checking status for ${providerName} at ${url}`);

  const startTime = performance.now();

  try {
    if (providerName.toLowerCase() === 'ollama') {
      // Special check for Ollama root endpoint
      try {
        console.log(`[Debug] Checking Ollama root endpoint: ${url}`);

        const controller = new AbortController();
        const timeoutId = setTimeout(() => controller.abort(), 5000); // 5 second timeout

        const response = await fetch(url, {
          signal: controller.signal,
          headers: {
            Accept: 'text/plain,application/json',
          },
        });
        clearTimeout(timeoutId);

        const text = await response.text();
        console.log(`[Debug] Ollama root response:`, text);

        if (text.includes('Ollama is running')) {
          console.log(`[Debug] Ollama running confirmed via root endpoint`);
          return {
            name: providerName,
            enabled: false,
            isLocal: true,
            isRunning: true,
            lastChecked: new Date(),
            responseTime: performance.now() - startTime,
            url,
          };
        }
      } catch (error) {
        console.log(`[Debug] Ollama root check failed:`, error);

        const errorMessage = error instanceof Error ? error.message : 'Unknown error';

        if (errorMessage.includes('aborted')) {
          return {
            name: providerName,
            enabled: false,
            isLocal: true,
            isRunning: false,
            error: 'Connection timeout',
            lastChecked: new Date(),
            responseTime: performance.now() - startTime,
            url,
          };
        }
      }
    }

    // Try different endpoints based on provider
    const checkUrls = [`${url}/api/health`, `${url}/v1/models`];
    console.log(`[Debug] Checking additional endpoints:`, checkUrls);

    const results = await Promise.all(
      checkUrls.map(async (checkUrl) => {
        try {
          console.log(`[Debug] Trying endpoint: ${checkUrl}`);

          const controller = new AbortController();
          const timeoutId = setTimeout(() => controller.abort(), 5000);

          const response = await fetch(checkUrl, {
            signal: controller.signal,
            headers: {
              Accept: 'application/json',
            },
          });
          clearTimeout(timeoutId);

          const ok = response.ok;
          console.log(`[Debug] Endpoint ${checkUrl} response:`, ok);

          if (ok) {
            try {
              const data = await response.json();
              console.log(`[Debug] Endpoint ${checkUrl} data:`, data);
            } catch {
              console.log(`[Debug] Could not parse JSON from ${checkUrl}`);
            }
          }

          return ok;
        } catch (error) {
          console.log(`[Debug] Endpoint ${checkUrl} failed:`, error);
          return false;
        }
      }),
    );

    const isRunning = results.some((result) => result);
    console.log(`[Debug] Final status for ${providerName}:`, isRunning);

    return {
      name: providerName,
      enabled: false,
      isLocal: true,
      isRunning,
      lastChecked: new Date(),
      responseTime: performance.now() - startTime,
      url,
    };
  } catch (error) {
    console.log(`[Debug] Provider check failed for ${providerName}:`, error);
    return {
      name: providerName,
      enabled: false,
      isLocal: true,
      isRunning: false,
      error: error instanceof Error ? error.message : 'Unknown error',
      lastChecked: new Date(),
      responseTime: performance.now() - startTime,
      url,
    };
  }
};

export default function DebugTab() {
  const { providers } = useSettings();
  const [activeProviders, setActiveProviders] = useState<ProviderStatus[]>([]);
  const [updateMessage, setUpdateMessage] = useState<string>('');
  const [systemInfo] = useState<SystemInfo>(getSystemInfo());
  const [isCheckingUpdate, setIsCheckingUpdate] = useState(false);

  const updateProviderStatuses = async () => {
    if (!providers) {
      return;
    }

    try {
      const entries = Object.entries(providers) as [string, IProviderConfig][];
      const statuses = entries
        .filter(([, provider]) => LOCAL_PROVIDERS.includes(provider.name))
        .map(async ([, provider]) => {
          const envVarName =
            provider.name.toLowerCase() === 'ollama'
              ? 'OLLAMA_API_BASE_URL'
              : provider.name.toLowerCase() === 'lmstudio'
                ? 'LMSTUDIO_API_BASE_URL'
                : `REACT_APP_${provider.name.toUpperCase()}_URL`;

          // Access environment variables through import.meta.env
          const url = import.meta.env[envVarName] || null;
          console.log(`[Debug] Using URL for ${provider.name}:`, url, `(from ${envVarName})`);

          const status = await checkProviderStatus(url, provider.name);

          return {
            ...status,
            enabled: provider.settings.enabled ?? false,
          };
        });

      Promise.all(statuses).then(setActiveProviders);
    } catch (error) {
      console.error('[Debug] Failed to update provider statuses:', error);
    }
  };

  useEffect(() => {
    updateProviderStatuses();

    const interval = setInterval(updateProviderStatuses, 30000);

    return () => clearInterval(interval);
  }, [providers]);

  const handleCheckForUpdate = useCallback(async () => {
    if (isCheckingUpdate) {
      return;
    }

    try {
      setIsCheckingUpdate(true);
      setUpdateMessage('Checking for updates...');

      const [originalResponse, forkResponse] = await Promise.all([
        fetch(GITHUB_URLS.original),
        fetch(GITHUB_URLS.fork),
      ]);

      if (!originalResponse.ok || !forkResponse.ok) {
        throw new Error('Failed to fetch repository information');
      }

      const [originalData, forkData] = await Promise.all([
        originalResponse.json() as Promise<{ sha: string }>,
        forkResponse.json() as Promise<{ sha: string }>,
      ]);

      const originalCommitHash = originalData.sha;
      const forkCommitHash = forkData.sha;
      const isForked = versionHash === forkCommitHash && forkCommitHash !== originalCommitHash;

      if (originalCommitHash !== versionHash) {
        setUpdateMessage(
          `Update available from original repository!\n` +
            `Current: ${versionHash.slice(0, 7)}${isForked ? ' (forked)' : ''}\n` +
            `Latest: ${originalCommitHash.slice(0, 7)}`,
        );
      } else {
        setUpdateMessage('You are on the latest version from the original repository');
      }
    } catch (error) {
      setUpdateMessage('Failed to check for updates');
      console.error('[Debug] Failed to check for updates:', error);
    } finally {
      setIsCheckingUpdate(false);
    }
  }, [isCheckingUpdate]);

  const handleCopyToClipboard = useCallback(() => {
    const debugInfo = {
      System: systemInfo,
      Providers: activeProviders.map((provider) => ({
        name: provider.name,
        enabled: provider.enabled,
        isLocal: provider.isLocal,
        running: provider.isRunning,
        error: provider.error,
        lastChecked: provider.lastChecked,
        responseTime: provider.responseTime,
        url: provider.url,
      })),
      Version: versionHash,
      Timestamp: new Date().toISOString(),
    };
    navigator.clipboard.writeText(JSON.stringify(debugInfo, null, 2)).then(() => {
      alert('Debug information copied to clipboard!');
    });
  }, [activeProviders, systemInfo]);

  return (
    <div className="p-4 space-y-6">
      <div className="flex items-center justify-between">
        <h3 className="text-lg font-medium text-bolt-elements-textPrimary">Debug Information</h3>
        <div className="flex gap-2">
          <button
            onClick={handleCopyToClipboard}
            className="bg-bolt-elements-button-primary-background rounded-lg px-4 py-2 transition-colors duration-200 hover:bg-bolt-elements-button-primary-backgroundHover text-bolt-elements-button-primary-text"
          >
            Copy Debug Info
          </button>
          <button
            onClick={handleCheckForUpdate}
            disabled={isCheckingUpdate}
            className={`bg-bolt-elements-button-primary-background rounded-lg px-4 py-2 transition-colors duration-200
              ${!isCheckingUpdate ? 'hover:bg-bolt-elements-button-primary-backgroundHover' : 'opacity-75 cursor-not-allowed'}
              text-bolt-elements-button-primary-text`}
          >
            {isCheckingUpdate ? 'Checking...' : 'Check for Updates'}
          </button>
        </div>
      </div>

      {updateMessage && (
        <div
          className={`bg-bolt-elements-surface rounded-lg p-3 ${
            updateMessage.includes('Update available') ? 'border-l-4 border-yellow-400' : ''
          }`}
        >
          <p className="text-bolt-elements-textSecondary whitespace-pre-line">{updateMessage}</p>
          {updateMessage.includes('Update available') && (
            <div className="mt-3 text-sm">
              <p className="font-medium text-bolt-elements-textPrimary">To update:</p>
              <ol className="list-decimal ml-4 mt-1 text-bolt-elements-textSecondary">
                <li>
                  Pull the latest changes:{' '}
                  <code className="bg-bolt-elements-surface-hover px-1 rounded">git pull upstream main</code>
                </li>
                <li>
                  Install any new dependencies:{' '}
                  <code className="bg-bolt-elements-surface-hover px-1 rounded">pnpm install</code>
                </li>
                <li>Restart the application</li>
              </ol>
            </div>
          )}
        </div>
      )}

      <section className="space-y-4">
        <div>
          <h4 className="text-md font-medium text-bolt-elements-textPrimary mb-2">System Information</h4>
          <div className="bg-bolt-elements-surface rounded-lg p-4">
            <div className="grid grid-cols-2 md:grid-cols-3 gap-4">
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">Operating System</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.os}</p>
              </div>
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">Browser</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.browser}</p>
              </div>
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">Screen Resolution</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.screen}</p>
              </div>
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">Language</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.language}</p>
              </div>
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">Timezone</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.timezone}</p>
              </div>
              <div>
                <p className="text-xs text-bolt-elements-textSecondary">CPU Cores</p>
                <p className="text-sm font-medium text-bolt-elements-textPrimary">{systemInfo.cores}</p>
              </div>
            </div>
            <div className="mt-3 pt-3 border-t border-bolt-elements-surface-hover">
              <p className="text-xs text-bolt-elements-textSecondary">Version</p>
              <p className="text-sm font-medium text-bolt-elements-textPrimary font-mono">
                {versionHash.slice(0, 7)}
                <span className="ml-2 text-xs text-bolt-elements-textSecondary">
                  ({new Date().toLocaleDateString()})
                </span>
              </p>
            </div>
          </div>
        </div>

        <div>
          <h4 className="text-md font-medium text-bolt-elements-textPrimary mb-2">Local LLM Status</h4>
          <div className="bg-bolt-elements-surface rounded-lg">
            <div className="grid grid-cols-1 divide-y">
              {activeProviders.map((provider) => (
                <div key={provider.name} className="p-3 flex flex-col space-y-2">
                  <div className="flex items-center justify-between">
                    <div className="flex items-center gap-3">
                      <div className="flex-shrink-0">
                        <div
                          className={`w-2 h-2 rounded-full ${
                            !provider.enabled ? 'bg-gray-300' : provider.isRunning ? 'bg-green-400' : 'bg-red-400'
                          }`}
                        />
                      </div>
                      <div>
                        <p className="text-sm font-medium text-bolt-elements-textPrimary">{provider.name}</p>
                        {provider.url && (
                          <p className="text-xs text-bolt-elements-textSecondary truncate max-w-[300px]">
                            {provider.url}
                          </p>
                        )}
                      </div>
                    </div>
                    <div className="flex items-center gap-2">
                      <span
                        className={`px-2 py-0.5 text-xs rounded-full ${
                          provider.enabled ? 'bg-green-100 text-green-800' : 'bg-gray-100 text-gray-800'
                        }`}
                      >
                        {provider.enabled ? 'Enabled' : 'Disabled'}
                      </span>
                      {provider.enabled && (
                        <span
                          className={`px-2 py-0.5 text-xs rounded-full ${
                            provider.isRunning ? 'bg-green-100 text-green-800' : 'bg-red-100 text-red-800'
                          }`}
                        >
                          {provider.isRunning ? 'Running' : 'Not Running'}
                        </span>
                      )}
                    </div>
                  </div>

                  <div className="pl-5 flex flex-col space-y-1 text-xs">
                    {/* Status Details */}
                    <div className="flex flex-wrap gap-2">
                      <span className="text-bolt-elements-textSecondary">
                        Last checked: {new Date(provider.lastChecked).toLocaleTimeString()}
                      </span>
                      {provider.responseTime && (
                        <span className="text-bolt-elements-textSecondary">
                          Response time: {Math.round(provider.responseTime)}ms
                        </span>
                      )}
                    </div>

                    {/* Error Message */}
                    {provider.error && (
                      <div className="mt-1 text-red-600 bg-red-50 rounded-md p-2">
                        <span className="font-medium">Error:</span> {provider.error}
                      </div>
                    )}

                    {/* Connection Info */}
                    {provider.url && (
                      <div className="text-bolt-elements-textSecondary">
                        <span className="font-medium">Endpoints checked:</span>
                        <ul className="list-disc list-inside pl-2 mt-1">
                          <li>{provider.url} (root)</li>
                          <li>{provider.url}/api/health</li>
                          <li>{provider.url}/v1/models</li>
                        </ul>
                      </div>
                    )}
                  </div>
                </div>
              ))}
              {activeProviders.length === 0 && (
                <div className="p-4 text-center text-bolt-elements-textSecondary">No local LLMs configured</div>
              )}
            </div>
          </div>
        </div>
      </section>
    </div>
  );
}