import { GASSpreadsheetService } from "./services/GASSpreadsheetService"
import { GASDriveService } from "./services/GASDriveService"
import { ShopifyMediaService } from "./services/ShopifyMediaService"
import { GASNetworkService } from "./services/GASNetworkService"
import { MediaService } from "./services/MediaService"
import { Shop } from "./shopifyApi"
import { Config } from "./config"
import { Product } from "./Product"

export function showMediaManager() {
  const html = HtmlService.createHtmlOutputFromFile("MediaManager")
    .setTitle("Media Manager")
    .setWidth(1100)
    .setHeight(750);
  SpreadsheetApp.getUi().showModalDialog(html, "Media Manager");
}

export function getSelectedSku(): string | null {
  const ss = new GASSpreadsheetService()
  const sheet = SpreadsheetApp.getActiveSheet()
  if (sheet.getName() !== "product_inventory") return null

  const row = sheet.getActiveRange().getRow()
  if (row <= 1) return null // Header

  const sku = ss.getCellValueByColumnName("product_inventory", row, "sku")
  return sku ? String(sku) : null
}

export function getPickerConfig() {
  const config = new Config()
  return {
    apiKey: config.googlePickerApiKey,
    token: ScriptApp.getOAuthToken(),
    email: Session.getEffectiveUser().getEmail(),
    parentId: config.productPhotosFolderId // Root folder to start picker in? Optionally could be SKU folder
  }
}

export function getMediaForSku(sku: string): any[] {
  const driveService = new GASDriveService()

  try {
      const config = new Config() // Moved inside try block to catch init errors
      const folder = driveService.getOrCreateFolder(sku, config.productPhotosFolderId)
      const files = driveService.getFiles(folder.getId())

      return files.map(f => {
          let thumb = ""
          try {
              const bytes = f.getThumbnail().getBytes()
              thumb = "data:image/png;base64," + Utilities.base64Encode(bytes)
          } catch (e) {
              console.log(`Failed to get thumbnail for ${f.getName()}`)
              // Fallback or empty
          }
          return {
              id: f.getId(),
              name: f.getName(),
              thumbnailLink: thumb
          }
      })
  } catch (e) {
      console.error(e)
      return []
  }
}

export function saveFileToDrive(sku: string, filename: string, mimeType: string, base64Data: string) {
  const config = new Config()
  const driveService = new GASDriveService()

  const folder = driveService.getOrCreateFolder(sku, config.productPhotosFolderId)
  const blob = Utilities.newBlob(Utilities.base64Decode(base64Data), mimeType, filename)

  driveService.saveFile(blob, folder.getId())

  // Auto-sync after upload?
  // syncMediaForSku(sku) // Optional: auto-sync
}

// Picker Callback specific handler if needed, or we just rely on frontend passing back file ID
// Implementing a "copy from Picker" handler
// Implementing a "copy from Picker" handler
export function importFromPicker(sku: string, fileId: string, mimeType: string, name: string, imageUrl: string | null) {
    const driveService = new GASDriveService()
    let config;
    try {
       config = new Config();
    } catch(e) {
       console.error("Config init failed in importFromPicker", e);
       throw new Error("Configuration Error: " + e.message);
    }

    console.log(`importFromPicker starting for SKU: ${sku}`);

    // STEP 1: Acquire/Create File in Root (Safe Zone)
    let finalFile: GoogleAppsScript.Drive.File;

    try {
        if (fileId && !imageUrl) {
            // Case A: Existing Drive File (Copy it)
            // Note: makeCopy(name) w/o folder argument copies to the same parent as original usually, or root?
            // Actually explicitly copying to Root is safer for "new" file.
            const source = DriveApp.getFileById(fileId);
            finalFile = source.makeCopy(name); // Default location
            console.log(`Step 1 Success: Drive File copied to Root/Default. ID: ${finalFile.getId()}`);
        } else if (imageUrl) {
            // Case B: URL (Photos) -> Blob -> File
            // Handling high-res parameter
            if (imageUrl.includes("googleusercontent.com") && !imageUrl.includes("=d")) {
                imageUrl += "=d"; // Download param
            }
            const response = UrlFetchApp.fetch(imageUrl, {
                 headers: {
                     Authorization: `Bearer ${ScriptApp.getOAuthToken()}`
                 },
                 muteHttpExceptions: true
            });

            console.log(`Download Response Code: ${response.getResponseCode()}`);
            if (response.getResponseCode() !== 200) {
                 const errorBody = response.getContentText().substring(0, 500);
                 throw new Error(`Request failed for ${imageUrl} returned code ${response.getResponseCode()}. Truncated server response: ${errorBody}`);
            }
            const blob = response.getBlob();
            console.log(`Blob Content-Type: ${blob.getContentType()}`);
            // console.log(`Blob Size: ${blob.getBytes().length} bytes`); // Commented out to save memory if huge

            if (blob.getContentType().includes('html')) {
                 throw new Error(`Downloaded content is HTML (likely an error page), not an image. Body peek: ${response.getContentText().substring(0,200)}`);
            }

            const fileName = name || `photo_${Date.now()}.jpg`;
            blob.setName(fileName);

            try {
                // Sanitize blob to remove any hidden metadata causing DriveApp issues
                const cleanBlob = Utilities.newBlob(blob.getBytes(), blob.getContentType(), fileName);
                finalFile = DriveApp.createFile(cleanBlob); // Creates in Root
                console.log(`Step 1 Success: Photo downloaded to Root. ID: ${finalFile.getId()}`);
            } catch (createErr) {
                 console.warn("DriveApp.createFile failed with clean blob. Trying Advanced Drive API...", createErr);
                 try {
                    // Fallback to Advanced Drive Service (v3 usually, or v2)
                    // Note: v2 uses 'insert' & 'title', v3 uses 'create' & 'name'
                    // We try v3 first as it's the modern default.

                    if (typeof Drive === 'undefined') {
                        throw new Error("Advanced Drive Service is not enabled. Please enable 'Drive API' in Apps Script Services.");
                    }

                    const drive = Drive as any;
                    let insertedFile;

                    if (drive.Files.create) {
                        // v3
                        const fileResource = { name: fileName, mimeType: blob.getContentType() };
                        insertedFile = drive.Files.create(fileResource, blob);
                    } else if (drive.Files.insert) {
                        // v2 fallback
                        const fileResource = { title: fileName, mimeType: blob.getContentType() };
                        insertedFile = drive.Files.insert(fileResource, blob);
                    } else {
                        throw new Error("Unknown Drive API version (neither create nor insert found).");
                    }

                    finalFile = DriveApp.getFileById(insertedFile.id);
                    console.log(`Step 1 Success (Advanced API): Photo downloaded to Root. ID: ${finalFile.getId()}`);
                 } catch (advErr) {
                     const metadata = `Type: ${blob.getContentType()}, Size: ${blob.getBytes().length}`;
                     console.error(`All file creation methods failed. Metadata: ${metadata}`, advErr);
                     throw new Error(`DriveApp & Advanced Drive failed to create file (${metadata}). Error: ${advErr.message}`);
                 }
            }

        } else {
            throw new Error("No File ID and No Image URL provided.");
        }
    } catch (e) {
        console.error("Step 1 Failed (File Creation)", e);
        throw e; // Re-throw modified error
    }

    // STEP 2: Get Target Folder
    let folder: GoogleAppsScript.Drive.Folder;
    try {
        folder = driveService.getOrCreateFolder(sku, config.productPhotosFolderId);
        console.log(`Step 2 Success: Target folder found/created. Name: ${folder.getName()}`);
    } catch (e) {
        console.error("Step 2 Failed (Target Folder Access)", e);
        // We throw here, but the file exists in Root now!
        throw new Error(`File saved to Drive Root, but failed to put in SKU folder: ${e.message}`);
    }

    // STEP 3: Move File to Folder
    try {
        finalFile.moveTo(folder);
        console.log(`Step 3 Success: File moved to target folder.`);
    } catch (e) {
        console.error("Step 3 Failed (Move)", e);
         throw new Error(`File created (ID: ${finalFile.getId()}), but failed to move to folder: ${e.message}`);
    }


}

export function syncMediaForSku(sku: string) {
  const config = new Config()
  const driveService = new GASDriveService()
  const shop = new Shop()
  const shopifyMediaService = new ShopifyMediaService(shop)
  const networkService = new GASNetworkService()

  const mediaService = new MediaService(driveService, shopifyMediaService, networkService, config)

  // Need Shopify Product ID
  // We can get it from the Product class or Sheet
  const product = new Product(sku)
  if (!product.shopify_id) {
      product.MatchToShopifyProduct(shop)
  }

  if (!product.shopify_id) {
      throw new Error("Product not found on Shopify. Please sync product first.")
  }

  mediaService.syncMediaForSku(sku, product.shopify_id)

  // Update thumbnail in sheet
  // TODO: Implement thumbnail update in sheet if desired
}

export function debugScopes() {
  const token = ScriptApp.getOAuthToken();
  console.log("Current Token exists: " + (token ? "YES" : "NO"));
  // We can't see exact scopes easily from server side without a library,
  // but we can check if the specific Photos pickup works?
  // No, let's just confirm the code is running the latest version.
}
export function debugFolderAccess() {
  const config = new Config()
  const ui = SpreadsheetApp.getUi();

  if (!config.productPhotosFolderId) {
    ui.alert("Config Error", "No productPhotosFolderId found in vars.", ui.ButtonSet.OK);
    return;
  }

  const id = config.productPhotosFolderId.trim();
  const info = [`Configured ID: '${id}'`];

  try {
    info.push(`User: ${Session.getActiveUser().getEmail()}`);
    info.push(`Effective: ${Session.getEffectiveUser().getEmail()}`);

    const folder = DriveApp.getFolderById(id);
    info.push(`Success! Found Folder: ${folder.getName()}`);
    info.push(`URL: ${folder.getUrl()}`);
    info.push("Access seems OK from Menu context.");
  } catch (e) {
    info.push("FAILED to access as FOLDER.");
    info.push(`Error: ${e.message}`);

    // Try as file
    try {
        const file = DriveApp.getFileById(id);
        info.push(`\nWAIT! This ID belongs to a FILE, not a FOLDER!`);
        info.push(`File Name: ${file.getName()}`);
        info.push(`Mime: ${file.getMimeType()}`);
    } catch (e2) {
        info.push(`\nNot a File either: ${e2.message}`);
    }

    // Try Advanced Drive API
    try {
        const drive = (typeof Drive !== 'undefined') ? (Drive as any) : undefined;
        if (!drive) {
            info.push("\nAdvanced Drive Service (Drive) is NOT enabled. Please enable it in 'Services' > 'Drive API'.");
        } else {
            const advItem = drive.Files.get(id, { supportsAllDrives: true });
            info.push(`\nSuccess via Advanced Drive API!`);
            info.push(`Title: ${advItem.title}`);
            info.push(`Mime: ${advItem.mimeType}`);
            info.push(`Note: If this works but DriveApp fails, this is likely a Shared Drive or permissions issue.`);
        }
    } catch (e3) {
        info.push(`\nAdvanced Drive API Failed: ${e3.message}`);
    }
  }

  ui.alert("Folder Access Debug", info.join("\n\n"), ui.ButtonSet.OK);
}

export function createPhotoSession() {
  const url = 'https://photospicker.googleapis.com/v1/sessions';
  const token = ScriptApp.getOAuthToken();

  const options = {
    method: 'post' as const,
    contentType: 'application/json',
    headers: {
      Authorization: `Bearer ${token}`
    },
    payload: JSON.stringify({}) // Default session
  };

  try {
    const response = UrlFetchApp.fetch(url, options);
    const data = JSON.parse(response.getContentText());
    return data; // { id: "...", pickerUri: "..." }
  } catch (e) {
    console.error("Failed to create photo session", e);
    throw new Error("Failed to create photo session: " + e.message);
  }
}

export function checkPhotoSession(sessionId: string) {
  // Use pageSize=100 or check documentation. Default is usually fine.
  // We need to poll until we get mediaItems.
  const url = `https://photospicker.googleapis.com/v1/mediaItems?sessionId=${sessionId}&pageSize=10`;
  const token = ScriptApp.getOAuthToken();

  const options = {
    method: 'get' as const,
    headers: {
      Authorization: `Bearer ${token}`
    },
    muteHttpExceptions: true
  };

  try {
    const response = UrlFetchApp.fetch(url, options);
    const text = response.getContentText();
    console.log(`Polling session ${sessionId}: ${response.getResponseCode()}`);

    if (response.getResponseCode() !== 200) {
      // 400 Bad Request often means "Picker session not ready" or "Empty" if using the wrong check.
      // But documentation says FAILED_PRECONDITION (400?) if user hasn't finished.
      console.log("Polling response: " + response.getResponseCode() + " " + text);
      return { status: 'waiting' }; // Treat as waiting
    }

    const data = JSON.parse(text);
    // data.mediaItems might be undefined if nothing picked yet?
    // Or API waits? Actually checking documentation: it returns empty list or hangs?
    // It usually returns immediatley. If empty, user hasn't picked.

    if (data.mediaItems && data.mediaItems.length > 0) {
      return { status: 'complete', mediaItems: data.mediaItems };
    }

    return { status: 'waiting' };
  } catch (e) {
    console.error("Failed to check photo session", e);
    return { status: 'error', message: e.message };
  }
}