import Airtable from "airtable";
import axios from "axios";
import logger from "../../logger";
import Run from "../../models/Run";
import Robot from "../../models/Robot";

interface AirtableUpdateTask {
  robotId: string;
  runId: string;
  status: 'pending' | 'completed' | 'failed';
  retries: number;
}

interface SerializableOutput {
  scrapeSchema?: any[];
  scrapeList?: any[];
}

const MAX_RETRIES = 3;
const BASE_API_DELAY = 2000;

export let airtableUpdateTasks: { [runId: string]: AirtableUpdateTask } = {};

async function refreshAirtableToken(refreshToken: string) {
  try {
    const response = await axios.post(
      "https://airtable.com/oauth2/v1/token",
      new URLSearchParams({
        grant_type: "refresh_token",
        refresh_token: refreshToken,
        client_id: process.env.AIRTABLE_CLIENT_ID!,
      }),
      {
        headers: {
          "Content-Type": "application/x-www-form-urlencoded",
        },
      }
    );

    return response.data;
  } catch (error: any) {
    logger.log("error", `Failed to refresh Airtable token: ${error.message}`);
    throw new Error(`Token refresh failed: ${error.response?.data?.error_description || error.message}`);
  }
}

function mergeRelatedData(serializableOutput: SerializableOutput, binaryOutput: Record<string, string>) {
  const mergedRecords: Record<string, any>[] = [];
  
  const maxLength = Math.max(
    ...[
      ...(serializableOutput.scrapeSchema ?? []).map(arr => arr?.length ?? 0),
      ...(serializableOutput.scrapeList ?? []).map(arr => arr?.length ?? 0),
      0
    ]
  );
  
  for (let i = 0; i < maxLength; i++) {
    mergedRecords.push({});
  }
  
  if (serializableOutput.scrapeSchema) {
    for (const schemaArray of serializableOutput.scrapeSchema) {
      if (!Array.isArray(schemaArray)) continue;
      
      for (let i = 0; i < schemaArray.length; i++) {
        if (i >= mergedRecords.length) break;
        mergedRecords[i] = { ...mergedRecords[i], ...schemaArray[i] };
      }
    }
  }
  
  if (serializableOutput.scrapeList) {
    for (const listArray of serializableOutput.scrapeList) {
      if (!Array.isArray(listArray)) continue;
      
      for (let i = 0; i < listArray.length; i++) {
        if (i >= mergedRecords.length) break;
        mergedRecords[i] = { ...mergedRecords[i], ...listArray[i] };
      }
    }
  }
  
  if (binaryOutput && Object.keys(binaryOutput).length > 0) {
    for (let i = 0; i < mergedRecords.length; i++) {
      const screenshotKey = `item-${i}`;
      if (binaryOutput[screenshotKey]) {
        mergedRecords[i].Screenshot = binaryOutput[screenshotKey];
        mergedRecords[i].Key = screenshotKey;
      }
    }
    
    for (const [key, url] of Object.entries(binaryOutput)) {
      if (mergedRecords.some(record => record.Key === key)) {
        continue;
      }
      
      mergedRecords.push({
        "Key": key,
        "Screenshot": url
      });
    }
  }
  
  return mergedRecords;
}

export async function updateAirtable(robotId: string, runId: string) {
  try {
    console.log(`Starting Airtable update for run: ${runId}, robot: ${robotId}`);
    
    const run = await Run.findOne({ where: { runId } });
    if (!run) throw new Error(`Run not found for runId: ${runId}`);

    const plainRun = run.toJSON();
    if (plainRun.status !== 'success') {
      console.log('Run status is not success, skipping Airtable update');
      return;
    }

    const robot = await Robot.findOne({ where: { 'recording_meta.id': robotId } });
    if (!robot) throw new Error(`Robot not found for robotId: ${robotId}`);

    const plainRobot = robot.toJSON();
    
    if (!plainRobot.airtable_base_id || !plainRobot.airtable_table_name || !plainRobot.airtable_table_id) {
      console.log('Airtable integration not configured');
      return;
    }

    console.log(`Airtable configuration found - Base: ${plainRobot.airtable_base_id}, Table: ${plainRobot.airtable_table_name}`);
    
    const serializableOutput = plainRun.serializableOutput as SerializableOutput;
    const binaryOutput = plainRun.binaryOutput || {};
    
    const mergedData = mergeRelatedData(serializableOutput, binaryOutput);
    
    if (mergedData.length > 0) {
      await writeDataToAirtable(
        robotId,
        plainRobot.airtable_base_id,
        plainRobot.airtable_table_name,
        plainRobot.airtable_table_id,
        mergedData
      );
      console.log(`All data written to Airtable for ${robotId}`);
    } else {
      console.log(`No data to write to Airtable for ${robotId}`);
    }
  } catch (error: any) {
    console.error(`Airtable update failed: ${error.message}`);
    throw error;
  }
}

async function withTokenRefresh<T>(robotId: string, apiCall: (accessToken: string) => Promise<T>): Promise<T> {
  const robot = await Robot.findOne({ where: { 'recording_meta.id': robotId } });
  if (!robot) throw new Error(`Robot not found for robotId: ${robotId}`);

  let accessToken = robot.get('airtable_access_token') as string;
  let refreshToken = robot.get('airtable_refresh_token') as string;

  if (!accessToken || !refreshToken) {
    throw new Error('Airtable credentials not configured');
  }

  try {
    return await apiCall(accessToken);
  } catch (error: any) {
    if (error.response?.status === 401 || 
        (error.statusCode === 401) || 
        error.message.includes('unauthorized') || 
        error.message.includes('expired')) {
      
      logger.log("info", `Refreshing expired Airtable token for robot: ${robotId}`);
      
      try {
        const tokens = await refreshAirtableToken(refreshToken);
        
        await robot.update({
          airtable_access_token: tokens.access_token,
          airtable_refresh_token: tokens.refresh_token || refreshToken
        });
        
        return await apiCall(tokens.access_token);
      } catch (refreshError: any) {
        logger.log("error", `Failed to refresh token: ${refreshError.message}`);
        throw new Error(`Token refresh failed: ${refreshError.message}`);
      }
    }
    
    throw error;
  }
}

export async function writeDataToAirtable(
  robotId: string,
  baseId: string,
  tableName: string,
  tableId: string,
  data: any[]
) {
  if (!data || data.length === 0) {
    console.log('No data to write. Skipping.');
    return;
  }

  try {
    return await withTokenRefresh(robotId, async (accessToken: string) => {
      const airtable = new Airtable({ apiKey: accessToken });
      const base = airtable.base(baseId);

      const processedData = data.map(item => {
        const cleanedItem: Record<string, any> = {};
        
        for (const [key, value] of Object.entries(item)) {
          if (value === null || value === undefined) {
            cleanedItem[key] = '';
          } else if (typeof value === 'object' && !Array.isArray(value)) {
            cleanedItem[key] = JSON.stringify(value);
          } else {
            cleanedItem[key] = value;
          }
        }
        
        return cleanedItem;
      });

      const existingFields = await getExistingFields(base, tableName);
      console.log(`Found ${existingFields.length} existing fields in Airtable: ${existingFields.join(', ')}`); 

      const dataFields = [...new Set(processedData.flatMap(row => Object.keys(row)))];  
      console.log(`Found ${dataFields.length} fields in data: ${dataFields.join(', ')}`);

      const missingFields = dataFields.filter(field => !existingFields.includes(field));
      const hasNewColumns = missingFields.length > 0;
      console.log(`Found ${missingFields.length} new fields: ${missingFields.join(', ')}`);

      for (const field of missingFields) {
        const sampleRow = processedData.find(row => field in row);
        if (sampleRow) {
          const sampleValue = sampleRow[field];
          try {
            await createAirtableField(baseId, tableName, field, sampleValue, accessToken, tableId);
            console.log(`Successfully created field: ${field}`);
            
            await new Promise(resolve => setTimeout(resolve, 200));
          } catch (fieldError: any) {
            console.warn(`Warning: Could not create field "${field}": ${fieldError.message}`);
          }
        }
      }
      
      let existingRecords: Array<{ id: string, fields: Record<string, any> }> = [];
      
      if (hasNewColumns) {
        existingRecords = await fetchAllRecords(base, tableName);
        console.log(`Found ${existingRecords.length} existing records in Airtable`);
      }
      
      if (hasNewColumns && existingRecords.length > 0) {
        const recordsToUpdate = [];
        const recordsToCreate = [];
        
        const newColumnData = processedData.map(record => {
          const newColumnsOnly: Record<string, any> = {};
          missingFields.forEach(field => {
            if (field in record) {
              newColumnsOnly[field] = record[field];
            }
          });
          return newColumnsOnly;
        });
        
        for (let i = 0; i < Math.min(existingRecords.length, newColumnData.length); i++) {
          if (Object.keys(newColumnData[i]).length > 0) {
            recordsToUpdate.push({
              id: existingRecords[i].id,
              fields: newColumnData[i]
            });
          }
        }
        
        const existingColumnsBeingUpdated = dataFields.filter(field => 
          existingFields.includes(field) && !missingFields.includes(field)
        );
        
        if (existingColumnsBeingUpdated.length > 0) {
          recordsToCreate.push(...processedData.map(record => ({ fields: record })));
          console.log(`Will append ${recordsToCreate.length} new records with all data`);
        } else {
          if (processedData.length > existingRecords.length) {
            const additionalRecords = processedData.slice(existingRecords.length);
            recordsToCreate.push(...additionalRecords.map(record => ({ fields: record })));
            console.log(`Will append ${recordsToCreate.length} additional records`);
          }
        }
        
        if (recordsToUpdate.length > 0) {
          console.log(`Updating ${recordsToUpdate.length} existing records with new columns`);
          const BATCH_SIZE = 10;
          for (let i = 0; i < recordsToUpdate.length; i += BATCH_SIZE) {
            const batch = recordsToUpdate.slice(i, i + BATCH_SIZE);
            console.log(`Updating batch ${Math.floor(i/BATCH_SIZE) + 1} of ${Math.ceil(recordsToUpdate.length/BATCH_SIZE)}`);
            
            try {
              await retryableAirtableUpdate(base, tableName, batch);
            } catch (batchError: any) {
              console.error(`Error updating batch: ${batchError.message}`);
              throw batchError;
            }
            
            await new Promise(resolve => setTimeout(resolve, 500));
          }
        }
      } else {
        console.log(`Appending all ${processedData.length} records to Airtable`);
        const recordsToCreate = processedData.map(record => ({ fields: record }));
        
        const BATCH_SIZE = 10;
        for (let i = 0; i < recordsToCreate.length; i += BATCH_SIZE) {
          const batch = recordsToCreate.slice(i, i + BATCH_SIZE);
          console.log(`Creating batch ${Math.floor(i/BATCH_SIZE) + 1} of ${Math.ceil(recordsToCreate.length/BATCH_SIZE)}`);
          
          try {
            await retryableAirtableCreate(base, tableName, batch);
          } catch (batchError: any) {
            console.error(`Error creating batch: ${batchError.message}`);
            throw batchError;
          }
          
          await new Promise(resolve => setTimeout(resolve, 500));
        }
      }
      
      await deleteEmptyRecords(base, tableName);
      
      logger.log('info', `Successfully processed ${processedData.length} records in Airtable`);
    });
  } catch (error: any) {
    logger.log('error', `Airtable write failed: ${error.message}`);
    throw error;
  }
}

async function fetchAllRecords(base: Airtable.Base, tableName: string): Promise<Array<{ id: string, fields: Record<string, any> }>> {
  try {
    console.log(`Fetching all records from ${tableName}...`);
    const records = await base(tableName).select().all();
    return records.map(record => ({
      id: record.id,
      fields: record.fields
    }));
  } catch (error: any) {
    console.warn(`Warning: Could not fetch all records: ${error.message}`);
    return [];
  }
}

async function deleteEmptyRecords(base: Airtable.Base, tableName: string): Promise<void> {
  console.log('Checking for empty records to clear...');
  
  try {
    const existingRecords = await base(tableName).select().all();
    console.log(`Found ${existingRecords.length} total records`);
    
    const emptyRecords = existingRecords.filter(record => {
      const fields = record.fields;
      return !fields || Object.keys(fields).length === 0 || 
             Object.values(fields).every(value => 
               value === null || value === undefined || value === '');
    });
        
    if (emptyRecords.length > 0) {
      console.log(`Found ${emptyRecords.length} empty records to delete`);
      const BATCH_SIZE = 10;
      for (let i = 0; i < emptyRecords.length; i += BATCH_SIZE) {
        const batch = emptyRecords.slice(i, i + BATCH_SIZE);
        const recordIds = batch.map(record => record.id);
        await base(tableName).destroy(recordIds);
        console.log(`Deleted batch ${Math.floor(i/BATCH_SIZE) + 1} of ${Math.ceil(emptyRecords.length/BATCH_SIZE)}`);
      }
      console.log(`Successfully deleted ${emptyRecords.length} empty records`);
    } else {
      console.log('No empty records found to delete');
    }
  } catch (error: any) {
    console.warn(`Warning: Could not clear empty records: ${error.message}`);
    console.warn('Will continue without deleting empty records');
  }
}

async function retryableAirtableCreate(
  base: Airtable.Base,
  tableName: string,
  batch: any[],
  retries = MAX_RETRIES
): Promise<void> {
  try {
    await base(tableName).create(batch);
  } catch (error) {
    if (retries > 0) {
      await new Promise(resolve => setTimeout(resolve, BASE_API_DELAY));
      return retryableAirtableCreate(base, tableName, batch, retries - 1);
    }
    throw error;
  }
}

async function retryableAirtableUpdate(
  base: Airtable.Base,
  tableName: string,
  batch: any[],
  retries = MAX_RETRIES
): Promise<void> {
  try {
    await base(tableName).update(batch);
  } catch (error) {
    if (retries > 0) {
      await new Promise(resolve => setTimeout(resolve, BASE_API_DELAY));
      return retryableAirtableUpdate(base, tableName, batch, retries - 1);
    }
    throw error;
  }
}

// Helper functions
async function getExistingFields(base: Airtable.Base, tableName: string): Promise<string[]> {
  try {
    const records = await base(tableName).select({ pageSize: 5 }).firstPage();
    const fieldNames = new Set<string>();
    
    if (records.length > 0) {
      records.forEach(record => {
        Object.keys(record.fields).forEach(field => fieldNames.add(field));
      });
    }
    
    const headers = Array.from(fieldNames);
    console.log(`Found ${headers.length} headers from records: ${headers.join(', ')}`);
    return headers;
  } catch (error) {
    console.warn(`Warning: Error fetching existing fields: ${error}`);
    return [];
  }
}

async function createAirtableField(
  baseId: string,
  tableName: string,
  fieldName: string,
  sampleValue: any,
  accessToken: string,
  tableId: string,
  retries = MAX_RETRIES
): Promise<void> {
  try {
    const fieldType = inferFieldType(sampleValue);
    
    console.log(`Creating field ${fieldName} with type ${fieldType}`);
    
    const response = await axios.post(
      `https://api.airtable.com/v0/meta/bases/${baseId}/tables/${tableId}/fields`,
      { name: fieldName, type: fieldType },
      { headers: { Authorization: `Bearer ${accessToken}` } }
    );
    
    logger.log('info', `Created field: ${fieldName} (${fieldType})`);
    return response.data;
  } catch (error: any) {
    if (retries > 0 && error.response?.status === 429) {
      await new Promise(resolve => setTimeout(resolve, BASE_API_DELAY));
      return createAirtableField(baseId, tableName, fieldName, sampleValue, accessToken, tableId, retries - 1);
    }
    
    if (error.response?.status === 422) {
      console.log(`Field ${fieldName} may already exist or has validation issues`);
      return;
    }
    
    const errorMessage = error.response?.data?.error?.message || error.message;
    const statusCode = error.response?.status || 'No Status Code';
    console.warn(`Field creation issue (${statusCode}): ${errorMessage}`);
  }
}

function inferFieldType(value: any): string {
  if (value === null || value === undefined) return 'singleLineText';
  if (typeof value === 'number') return 'number';
  if (typeof value === 'boolean') return 'checkbox';
  if (value instanceof Date) return 'dateTime';
  if (Array.isArray(value)) {
    return value.length > 0 && typeof value[0] === 'object' ? 'multipleRecordLinks' : 'multipleSelects';
  }
  if (typeof value === 'string' && isValidUrl(value)) return 'url';
  return 'singleLineText';
}

function isValidUrl(str: string): boolean {
  try {
    new URL(str);
    return true;
  } catch (_) {
    return false;
  }
}

export const processAirtableUpdates = async () => {
  while (true) {
    let hasPendingTasks = false;
    
    for (const runId in airtableUpdateTasks) {
      const task = airtableUpdateTasks[runId];
      
      if (task.status === 'pending') {
        hasPendingTasks = true;
        console.log(`Processing Airtable update for run: ${runId}`);
        
        try {
          await updateAirtable(task.robotId, task.runId);
          console.log(`Successfully updated Airtable for runId: ${runId}`);
          airtableUpdateTasks[runId].status = 'completed';
          delete airtableUpdateTasks[runId]; 
        } catch (error: any) {
          console.error(`Failed to update Airtable for run ${task.runId}:`, error);
          
          if (task.retries < MAX_RETRIES) {
            airtableUpdateTasks[runId].retries += 1;
            console.log(`Retrying task for runId: ${runId}, attempt: ${task.retries + 1}`);
          } else {
            airtableUpdateTasks[runId].status = 'failed';
            console.log(`Max retries reached for runId: ${runId}. Marking task as failed.`);
            logger.log('error', `Permanent failure for run ${runId}: ${error.message}`);
          }
        }
      }
    }

    if (!hasPendingTasks) {
      console.log('No pending Airtable update tasks, exiting processor');
      break;
    }
    
    console.log('Waiting for 5 seconds before checking again...');
    await new Promise(resolve => setTimeout(resolve, 5000));
  }
};