// Job Folder Integration Module
// This module handles folder creation and share link capture after PocketBase record creation
// Uses the same Graph API token from the server to avoid re-authentication

const { DRIVE_ID, PARENT_ITEM_ID } = require('./config');
const { Document, Packer, Paragraph, HeadingLevel, TextRun, convertInchesToTwip } = require('docx');

/**
 * Creates a manager info document template
 * @param {string} jobNumber - Job number
 * @param {string} jobName - Job name
 * @param {Object} record - Full job record with all data
 * @returns {Promise<Buffer>} Word document buffer
 */
async function createManagerInfoDocument(jobNumber, jobName, record) {
  // Extract fields from record, with fallbacks
  const jobAddress = record.Job_Address || record.job_address || '';
  const companyClient = record.Company_Client || record.company_client || '';
  const jobType = record.Job_Type || record.job_type || '';
  const jobDivision = record.Job_Division || record.job_division || '';
  const contactPerson = record.Contact_Person || record.contact_person || '';
  const phoneNumber = record.Phone_Number || record.phone_number || '';
  const jobStatus = record.Job_Status || record.job_status || '';

  const doc = new Document({
    sections: [{
      properties: {},
      children: [
        // Header: Job # and Name
        new Paragraph({
          text: `Job # ${jobNumber}`,
          heading: HeadingLevel.HEADING_1,
          spacing: { after: 0 }
        }),
        new Paragraph({
          text: `Name: ${jobName}`,
          heading: HeadingLevel.HEADING_1,
          spacing: { after: 200 }
        }),

        // Project Info section
        new Paragraph({
          text: 'Project Info',
          heading: HeadingLevel.HEADING_2,
          spacing: { before: 200, after: 100 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Job Name: ' }),
            new TextRun({ text: jobName, underline: {} })
          ],
          spacing: { after: 50 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Job Address: ' }),
            new TextRun({ text: jobAddress, underline: {} })
          ],
          spacing: { after: 50 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Job Division: ' }),
            new TextRun({ text: jobDivision, underline: {} })
          ],
          spacing: { after: 50 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Customer/Client Name: ' }),
            new TextRun({ text: companyClient, underline: {} })
          ],
          spacing: { after: 50 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Job Type: ' }),
            new TextRun({ text: jobType, underline: {} })
          ],
          spacing: { after: 50 }
        }),
        new Paragraph({
          children: [
            new TextRun({ text: 'Job Status: ' }),
            new TextRun({ text: jobStatus, underline: {} })
          ],
          spacing: { after: 200 }
        }),

        // Estimates Information section
        new Paragraph({
          text: 'Estimates Information',
          heading: HeadingLevel.HEADING_2,
          spacing: { before: 200, after: 100 }
        }),
        new Paragraph({
          text: 'Scope: _________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: 'Main Vendors: _________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: 'Estimate Cost: _________________________________',
          spacing: { after: 200 }
        }),

        // Schedule section
        new Paragraph({
          text: 'Schedule',
          heading: HeadingLevel.HEADING_2,
          spacing: { before: 200, after: 100 }
        }),
        new Paragraph({
          text: 'Expected Start Date: _________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: 'Actual Start Date: _________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: 'Estimated End Date: _________________________________',
          spacing: { after: 200 }
        }),

        // Main Contacts section
        new Paragraph({
          text: 'Main Contacts',
          heading: HeadingLevel.HEADING_2,
          spacing: { before: 200, after: 100 }
        }),
        new Paragraph({
          text: 'Project Manager (Name / Phone / Email):',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: `${contactPerson}${phoneNumber ? ' / ' + phoneNumber : ''}`,
          spacing: { after: 100 }
        }),
        new Paragraph({
          text: 'Superintendent (Name / Phone / Email):',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 100 }
        }),
        new Paragraph({
          text: 'Assistant/Coordinator (Name / Phone / Email):',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 100 }
        }),
        new Paragraph({
          text: 'Billing Manager (Name / Phone / Email):',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 200 }
        }),

        // Job Notes & Key Info section
        new Paragraph({
          text: 'Job Notes & Key Info',
          heading: HeadingLevel.HEADING_2,
          spacing: { before: 200, after: 100 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        }),
        new Paragraph({
          text: '_________________________________________________________________',
          spacing: { after: 50 }
        })
      ]
    }]
  });

  return await Packer.toBuffer(doc);
}

/**
 * Creates a job folder structure in OneDrive/SharePoint and returns the share link
 * @param {string} accessToken - Graph API access token (from server's token flow)
 * @param {string} jobNumber - Job number (e.g., "12345")
 * @param {string} jobFullName - Full job name calculated from form data
 * @param {Object} record - Full job record with all data
 * @returns {Promise<Object>} Result with folder IDs and share link
 */
async function createJobFolderAndGetLink(accessToken, jobNumber, jobFullName, record) {
  try {
    // 1) Create main folder under configured parent
    const mainFolderName = `${jobNumber} - ${jobFullName}`;
    const createFolderEndpoint = `https://graph.microsoft.com/v1.0/drives/${DRIVE_ID}/items/${PARENT_ITEM_ID}/children`;
    
    console.log(`[Job Folder Integration] Creating main folder: ${mainFolderName}`);
    const folderResp = await fetch(createFolderEndpoint, {
      method: 'POST',
      headers: { 
        'Authorization': `Bearer ${accessToken}`, 
        'Content-Type': 'application/json' 
      },
      body: JSON.stringify({ 
        name: mainFolderName, 
        folder: {}, 
        "@microsoft.graph.conflictBehavior": "rename" 
      })
    });
    
    const folderData = await folderResp.json();
    console.log(`[Job Folder Integration] Create folder response:`, { 
      status: folderResp.status, 
      folderId: folderData.id,
      folderName: folderData.name 
    });
    
    if (!folderResp.ok) {
      throw new Error(`Create main folder failed: ${JSON.stringify(folderData)}`);
    }
    
    const mainFolderId = folderData.id;

    // 2) Create subfolder "Managers Info"
    console.log('[Job Folder Integration] Creating subfolder: Managers Info');
    const subFolderResp = await fetch(
      `https://graph.microsoft.com/v1.0/drives/${DRIVE_ID}/items/${mainFolderId}/children`, 
      {
        method: 'POST',
        headers: { 
          'Authorization': `Bearer ${accessToken}`, 
          'Content-Type': 'application/json' 
        },
        body: JSON.stringify({ 
          name: 'Managers Info', 
          folder: {}, 
          "@microsoft.graph.conflictBehavior": "rename" 
        })
      }
    );
    
    const subFolderData = await subFolderResp.json();
    console.log('[Job Folder Integration] Create subfolder response:', { 
      status: subFolderResp.status, 
      subfolderId: subFolderData.id 
    });
    
    if (!subFolderResp.ok) {
      throw new Error(`Create subfolder failed: ${JSON.stringify(subFolderData)}`);
    }
    
    const subFolderId = subFolderData.id;

    // 3) Create and upload Manager Info document to Managers Info subfolder
    console.log('[Job Folder Integration] Creating and uploading Manager Info document');
    try {
      const docBuffer = await createManagerInfoDocument(jobNumber, jobFullName, record);
      const uploadResp = await fetch(
        `https://graph.microsoft.com/v1.0/drives/${DRIVE_ID}/items/${subFolderId}:/${jobNumber} - Manager Info.docx:/content`,
        {
          method: 'PUT',
          headers: {
            'Authorization': `Bearer ${accessToken}`,
            'Content-Type': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
          },
          body: docBuffer
        }
      );

      if (!uploadResp.ok) {
        const errorData = await uploadResp.text();
        console.warn('[Job Folder Integration] Failed to upload Manager Info document:', { 
          status: uploadResp.status, 
          error: errorData 
        });
      } else {
        console.log('[Job Folder Integration] ✓ Manager Info document uploaded successfully');
      }
    } catch (docError) {
      console.warn('[Job Folder Integration] Error creating/uploading Manager Info document:', docError);
    }

    // 4) Create share link for the main folder
    console.log('[Job Folder Integration] Creating share link for main folder');
    const shareResp = await fetch(
      `https://graph.microsoft.com/v1.0/drives/${DRIVE_ID}/items/${mainFolderId}/createLink`, 
      {
        method: 'POST',
        headers: { 
          'Authorization': `Bearer ${accessToken}`, 
          'Content-Type': 'application/json' 
        },
        body: JSON.stringify({ 
          type: 'view', 
          scope: 'organization' 
        })
      }
    );
    
    const shareData = await shareResp.json();
    console.log('[Job Folder Integration] Share link response:', { 
      status: shareResp.status, 
      hasLink: !!shareData.link?.webUrl 
    });

    if (!shareResp.ok) {
      throw new Error(`Create share link failed: ${JSON.stringify(shareData)}`);
    }

    const shareLink = shareData.link && shareData.link.webUrl ? shareData.link.webUrl : null;

    console.log(`[Job Folder Integration] ✓ Successfully created folder structure and share link`);
    console.log(`[Job Folder Integration] Share link: ${shareLink}`);

    return {
      success: true,
      mainFolderId,
      mainFolderName,
      subFolderId,
      shareLink,
      folderPath: mainFolderName
    };

  } catch (error) {
    console.error('[Job Folder Integration] Error in createJobFolderAndGetLink:', error);
    throw error;
  }
}

module.exports = {
  createJobFolderAndGetLink,
  createManagerInfoDocument
};