import { JobApplication } from '../types';

let cachedAccessToken: string | null = localStorage.getItem('ai_job_portal_google_token');

export const getCachedAccessToken = () => cachedAccessToken;

const getEnvVar = (key: string) => {
  try {
    return (import.meta as any).env?.[key];
  } catch (e) {
    return undefined;
  }
};

const OAUTH_CLIENT_ID = getEnvVar('VITE_GOOGLE_OAUTH_CLIENT_ID') || '488548028456-tal52pta8fm2uc9t4o2u82itqvi91rp7.apps.googleusercontent.com';

/**
 * Direct Google OAuth 2.0 Flow via Google Identity Services
 * Obtains real access token directly from accounts.google.com for Google Drive/Sheets API calls.
 */
export const googleWorkspaceSignIn = async (): Promise<{ email: string; name: string; accessToken: string }> => {
  return new Promise((resolve, reject) => {
    try {
      const scope = encodeURIComponent('https://www.googleapis.com/auth/spreadsheets https://www.googleapis.com/auth/drive https://www.googleapis.com/auth/documents');
      const redirectUri = encodeURIComponent(`${window.location.origin}`);
      const authUrl = `https://accounts.google.com/o/oauth2/v2/auth?client_id=${OAUTH_CLIENT_ID}&redirect_uri=${redirectUri}&response_type=token&scope=${scope}&prompt=select_account`;

      const width = 500;
      const height = 650;
      const left = window.screenX + (window.outerWidth - width) / 2;
      const top = window.screenY + (window.outerHeight - height) / 2;

      const popup = window.open(
        authUrl,
        'Google Workspace OAuth Sign-In',
        `width=${width},height=${height},left=${left},top=${top},scrollbars=yes`
      );

      if (!popup) {
        throw new Error('Popup window was blocked by your browser. Please allow popups for http://localhost:3000.');
      }

      const interval = setInterval(async () => {
        try {
          if (popup.closed) {
            clearInterval(interval);
            if (!cachedAccessToken) {
              reject(new Error('Sign-in window closed before completing authentication.'));
            }
            return;
          }

          const currentUrl = popup.location.href;
          if (currentUrl && currentUrl.includes(window.location.origin)) {
            const hash = popup.location.hash;
            if (hash && hash.includes('access_token=')) {
              clearInterval(interval);
              popup.close();

              const params = new URLSearchParams(hash.substring(1));
              const token = params.get('access_token');

              if (token) {
                cachedAccessToken = token;
                localStorage.setItem('ai_job_portal_google_token', token);
                localStorage.setItem('ai_job_portal_google_connected', 'true');

                try {
                  const userRes = await fetch('https://www.googleapis.com/oauth2/v2/userinfo', {
                    headers: { Authorization: `Bearer ${token}` }
                  });
                  if (userRes.ok) {
                    const userData = await userRes.json();
                    resolve({
                      email: userData.email || 'dkifer19@gmail.com',
                      name: userData.name || 'David Kifer',
                      accessToken: token
                    });
                    return;
                  }
                } catch (e) {}

                resolve({
                  email: 'dkifer19@gmail.com',
                  name: 'David Kifer',
                  accessToken: token
                });
              }
            }
          }
        } catch (e) {}
      }, 400);

    } catch (err: any) {
      reject(err);
    }
  });
};

export const googleSignOut = async () => {
  cachedAccessToken = null;
  localStorage.removeItem('ai_job_portal_google_token');
  localStorage.removeItem('ai_job_portal_google_connected');
  localStorage.removeItem('ai_job_portal_google_user');
};



// Workspace Action Handlers

export async function exportApplicationsToGoogleSheets(
  applications: JobApplication[],
  accessToken?: string
): Promise<{ spreadsheetId: string; spreadsheetUrl: string; isLocalCsv?: boolean; message?: string }> {
  const token = accessToken || cachedAccessToken;
  const res = await fetch('/api/workspace/sheets/export', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {})
    },
    body: JSON.stringify({ applications, accessToken: token })
  });
  const data = await res.json();
  if (!data.success) {
    throw new Error(data.error || 'Failed to export applications to Google Sheets');
  }
  return { spreadsheetId: data.spreadsheetId, spreadsheetUrl: data.spreadsheetUrl, isLocalCsv: data.isLocalCsv, message: data.message };
}

export async function createTailoredGoogleDoc(
  title: string,
  content: string,
  docType: 'resume' | 'coverLetter' | 'note',
  accessToken?: string
): Promise<{ documentId: string; documentUrl: string; isLocalDoc?: boolean; message?: string }> {
  const token = accessToken || cachedAccessToken;
  const res = await fetch('/api/workspace/docs/create', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {})
    },
    body: JSON.stringify({ title, content, docType, accessToken: token })
  });
  const data = await res.json();
  if (!data.success) {
    throw new Error(data.error || 'Failed to create Google Doc');
  }
  return { documentId: data.documentId, documentUrl: data.documentUrl, isLocalDoc: data.isLocalDoc, message: data.message };
}

export async function uploadFileToGoogleDrive(
  fileName: string,
  fileContent: string,
  mimeType: string = 'text/plain',
  accessToken?: string
): Promise<{ fileId: string; driveUrl: string; isLocalFile?: boolean; message?: string }> {
  const token = accessToken || cachedAccessToken;
  const res = await fetch('/api/workspace/drive/upload', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {})
    },
    body: JSON.stringify({ fileName, fileContent, mimeType, accessToken: token })
  });
  const data = await res.json();
  if (!data.success) {
    throw new Error(data.error || 'Failed to upload file to Google Drive');
  }
  return { fileId: data.fileId, driveUrl: data.driveUrl, isLocalFile: data.isLocalFile, message: data.message };
}

export async function listGoogleDriveWorkspaceFiles(accessToken?: string): Promise<any[]> {
  const token = accessToken || cachedAccessToken;
  const res = await fetch('/api/workspace/drive/files', {
    headers: {
      ...(token ? { Authorization: `Bearer ${token}` } : {})
    }
  });
  const data = await res.json();
  return data.files || [];
}

export async function saveGoogleKeepNote(
  title: string,
  content: string,
  color: string = 'DEFAULT',
  accessToken?: string
): Promise<{ noteId: string; title: string; content: string; color: string; timestamp: string }> {
  const token = accessToken || cachedAccessToken;
  const res = await fetch('/api/workspace/keep/create', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {})
    },
    body: JSON.stringify({ title, content, color, accessToken: token })
  });
  const data = await res.json();
  if (!data.success) {
    throw new Error(data.error || 'Failed to create Keep note');
  }
  return data.note;
}