import { Request, Response } from 'express';
import { v4 as uuidv4 } from 'uuid';
import { Database } from '../database';
import { SignerImprovedService } from '../services/signer-improved';
import { SessionManager } from '../utils/session-manager';
import { authTokens } from '../utils/auth-tokens';
import { ProcessInfo, ProcessData, ProcessRoles, EOfficeStatus } from '../types';
import { config } from '../config';
import { Logger } from '../utils/logger';
import { 
  AppError, 
  ErrorCode, 
  NotFoundError, 
  ExternalServiceError,
  BusinessRuleError 
} from '../types/errors';
import { asyncHandler } from '../middleware/error-handler';

export class ProcessImprovedController {
  static getUserProcess = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const requestId = req.headers['x-request-id'] as string;
    
    Logger.info('User process request initiated', { requestId });

    // Find the full token data which should contain the original idNotUser data
    const userAuth = authTokens.find(auth => auth.authToken === req.idNotUser!.authToken);
    
    if (!userAuth || !userAuth.idNotUser) {
      throw new NotFoundError('Données utilisateur non trouvées. Veuillez vous reconnecter.', requestId);
    }

    const { pairingId } = req.query;

    // Execute signer operations with retry logic
    const processResult = await SignerImprovedService.executeWithRetry(
      async (signerClient) => {
        return await signerClient.getUserProcessByIdnot(userAuth.idNotUser.idNot);
      },
      'getUserProcessByIdnot',
      3
    );

    if (!processResult.success) {
      throw new ExternalServiceError('Signer', processResult.error?.message || 'Failed to get user process', requestId);
    }

    let process: ProcessInfo | null = processResult.data || null;

    if (!process) {
      Logger.info('No existing process found, creating new one', { 
        requestId, 
        userIdNot: userAuth.idNotUser.idNot 
      });

      // Get UUID from database
      let uuid: string;
      try {
        const result = await Database.query('SELECT uid FROM users WHERE "idNot" = $1', [userAuth.idNotUser.idNot]);
        uuid = result.rows.length > 0 ? result.rows[0].uid : null;
      } catch (error) {
        Logger.error('Error fetching UUID by idNot', {
          requestId,
          error: error instanceof Error ? error.message : 'Unknown error'
        });
        uuid = '';
      }
      
      if (!uuid) {
        Logger.info('No existing UUID found in db, generating new one', { requestId });
        uuid = uuidv4();
      }

      const processData: ProcessData = {
        uid: uuid,
        utype: 'collaborator',
        idNot: userAuth.idNotUser.idNot,
        office: {
          idNot: userAuth.idNotUser.office.idNot,
        },
        role: userAuth.idNotUser.role,
        office_role: userAuth.idNotUser.office_role,
        contact: userAuth.idNotUser.contact,
      };

      const privateFields = Object.keys(processData);
      const allFields = [...privateFields, 'roles'];
      // Make those fields public
      privateFields.splice(privateFields.indexOf('uid'), 1); 
      privateFields.splice(privateFields.indexOf('utype'), 1); 
      privateFields.splice(privateFields.indexOf('idNot'), 1); 

      // Get pairing ID with retry
      const pairingResult = await SignerImprovedService.executeWithRetry(
        async (signerClient) => {
          return await signerClient.getPairingId();
        },
        'getPairingId',
        3
      );

      if (!pairingResult.success) {
        throw new ExternalServiceError('Signer', pairingResult.error?.message || 'Failed to get pairing ID', requestId);
      }

      const validatorId = pairingResult.data!.pairingId;

      const roles: ProcessRoles = {
        owner: {
          members: [pairingId as string, validatorId],
          validation_rules: [
            {
              quorum: 0.1,
              fields: allFields,
              min_sig_member: 1,
            }
          ],
          storages: [config.defaultStorage]
        },
        apophis: {
          members: [pairingId as string, validatorId],
          validation_rules: [],
          storages: []
        }
      };

      // Create process with retry
      const createResult = await SignerImprovedService.executeWithRetry(
        async (signerClient) => {
          return await signerClient.createProcess(processData, privateFields, roles);
        },
        'createProcess',
        3
      );

      if (!createResult.success) {
        throw new ExternalServiceError('Signer', createResult.error?.message || 'Failed to create process', requestId);
      }

      Logger.info('Created new process', { 
        requestId, 
        processId: createResult.data!.processId 
      });

      process = { 
        processId: createResult.data!.processId || '', 
        processData: createResult.data!.data 
      };
    } else {
      Logger.info('Using existing process', { 
        requestId, 
        processId: process.processId 
      });
    }

    // Check if process is committed and handle role updates
    const processManagementResult = await SignerImprovedService.executeWithRetry(
      async (signerClient) => {
        const allProcesses = await signerClient.getOwnedProcesses();
        
        if (allProcesses && process) {
          const processStates = allProcesses.processes[process.processId].states;
          const isNotCommited = processStates.length === 2 
            && processStates[1].commited_in === processStates[0].commited_in;
            
          if (isNotCommited) {
            Logger.info('Process not committed, committing it', { 
              requestId, 
              processId: process.processId 
            });
            await signerClient.validateState(process.processId, processStates[0].state_id);
          }

          // Check pairing ID in roles
          let roles: ProcessRoles;
          if (isNotCommited) {
            const firstState = processStates[0];
            roles = firstState.roles;
          } else {
            const tip = processStates[processStates.length - 1].commited_in;
            const lastState = processStates.findLast((state: any) => state.commited_in !== tip);
            roles = lastState.roles;
          }

          if (!roles) {
            throw new Error('No roles found');
          } else if (!roles['owner']) {
            throw new Error('No owner role found');
          }

          if (!roles['owner'].members.includes(req.query.pairingId as string)) {
            Logger.info('Adding new pairingId to owner role', { 
              requestId, 
              pairingId: req.query.pairingId,
              processId: process.processId
            });
            
            roles['owner'].members.push(req.query.pairingId as string);
            const updatedProcessReturn = await signerClient.updateProcess(process.processId, {}, [], roles);
            const processId = updatedProcessReturn.updatedProcess.process_id;
            const stateId = updatedProcessReturn.updatedProcess.diffs[0].state_id;
            await signerClient.notifyUpdate(processId, stateId);
            await signerClient.validateState(processId, stateId);
          }
        }
        
        return process;
      },
      'processManagement',
      2
    );

    if (!processManagementResult.success) {
      throw new ExternalServiceError('Signer', processManagementResult.error?.message || 'Failed to manage process', requestId);
    }

    Logger.info('User process request completed successfully', { 
      requestId, 
      processId: process?.processId 
    });

    res.json({
      success: true,
      data: processManagementResult.data
    });
  });

  static getOfficeProcess = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const requestId = req.headers['x-request-id'] as string;
    
    Logger.info('Office process request initiated', { requestId });

    const userAuth = authTokens.find(auth => auth.authToken === req.idNotUser!.authToken);
    
    if (!userAuth || !userAuth.idNotUser) {
      throw new NotFoundError('Données utilisateur non trouvées. Veuillez vous reconnecter.', requestId);
    }

    // Check office status
    if (userAuth.idNotUser.office.office_status !== EOfficeStatus.ACTIVATED) {
      throw new BusinessRuleError('Office not activated', undefined, requestId);
    }

    // Get office process with retry
    const processResult = await SignerImprovedService.executeWithRetry(
      async (signerClient) => {
        return await signerClient.getOfficeProcessByIdnot(userAuth.idNotUser.office.idNot);
      },
      'getOfficeProcessByIdnot',
      3
    );

    if (!processResult.success) {
      throw new ExternalServiceError('Signer', processResult.error?.message || 'Failed to get office process', requestId);
    }

    let process: ProcessInfo | null = processResult.data || null;

    if (!process) {
      Logger.info('No existing office process found, creating new one', { 
        requestId, 
        officeIdNot: userAuth.idNotUser.office.idNot 
      });

      // Get validator ID with retry
      const pairingResult = await SignerImprovedService.executeWithRetry(
        async (signerClient) => {
          return await signerClient.getPairingId();
        },
        'getPairingId',
        3
      );

      if (!pairingResult.success) {
        throw new ExternalServiceError('Signer', pairingResult.error?.message || 'Failed to get validator ID', requestId);
      }

      const validatorId = pairingResult.data!.pairingId;
      if (!validatorId) {
        throw new BusinessRuleError('No validator id found', undefined, requestId);
      }

      // Get UUID from database
      let uuid: string;
      try {
        const result = await Database.query('SELECT uid FROM offices WHERE "idNot" = $1', [userAuth.idNotUser.office.idNot]);
        uuid = result.rows.length > 0 ? result.rows[0].uid : null;
      } catch (error) {
        Logger.error('Error fetching office UUID by idNot', {
          requestId,
          error: error instanceof Error ? error.message : 'Unknown error'
        });
        uuid = '';
      }
      
      if (!uuid) {
        Logger.info('No existing office UUID found in db, generating new one', { requestId });
        uuid = uuidv4();
      }

      const processData: ProcessData = {
        uid: uuid,
        utype: 'office',
        ...userAuth.idNotUser.office,
      };

      const privateFields = Object.keys(processData);

      const roles: ProcessRoles = {
        owner: {
          members: [validatorId],
          validation_rules: [],
          storages: []
        },
        apophis: {
          members: [validatorId],
          validation_rules: [],
          storages: []
        }
      };

      // Create office process with retry
      const createResult = await SignerImprovedService.executeWithRetry(
        async (signerClient) => {
          return await signerClient.createProcess(processData, privateFields, roles);
        },
        'createOfficeProcess',
        3
      );

      if (!createResult.success) {
        throw new ExternalServiceError('Signer', createResult.error?.message || 'Failed to create office process', requestId);
      }

      Logger.info('Created new office process', { 
        requestId, 
        processId: createResult.data!.processId 
      });

      process = { 
        processId: createResult.data!.processId || '', 
        processData: createResult.data!.data 
      };
    }

    Logger.info('Office process request completed successfully', { 
      requestId, 
      processId: process?.processId 
    });

    res.json({
      success: true,
      data: process
    });
  });

  static authenticateClient = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const requestId = req.headers['x-request-id'] as string;
    const { pairingId } = req.body;

    if (!pairingId) {
      throw new BusinessRuleError('Missing pairingId', undefined, requestId);
    }

    Logger.info('Client authentication initiated', { requestId, pairingId });

    // This should be implemented properly based on your business logic
    // For now, just clean up the session
    SessionManager.deleteSession(req.session!.id);
    
    Logger.info('Client authentication completed', { requestId });

    res.json({
      success: true,
      message: 'Client authentication successful',
      data: {}
    });
  });

  static getPhoneNumberForEmail = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const requestId = req.headers['x-request-id'] as string;
    const { email } = req.body;

    if (!email) {
      throw new BusinessRuleError('Missing email', undefined, requestId);
    }

    Logger.info('Phone number lookup initiated', { requestId, email });

    const phoneResult = await SignerImprovedService.executeWithRetry(
      async (signerClient) => {
        return await signerClient.getPhoneNumberForEmail(email);
      },
      'getPhoneNumberForEmail',
      3
    );

    if (!phoneResult.success) {
      throw new ExternalServiceError('Signer', phoneResult.error?.message || 'Failed to get phone number', requestId);
    }

    const phoneNumber = phoneResult.data;

    if (!phoneNumber) {
      throw new NotFoundError('No phone number found for this email', requestId);
    }

    Logger.info('Phone number lookup completed', { requestId, email });

    res.json({
      success: true,
      message: 'Phone number retrieved successfully',
      phoneNumber: phoneNumber
    });
  });

  // Health check endpoint for signer service
  static getSignerHealth = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const healthStatus = SignerImprovedService.getHealthStatus();
    
    res.json({
      success: true,
      data: {
        signer: healthStatus,
        timestamp: new Date().toISOString()
      }
    });
  });

  // Force reconnection endpoint (for debugging/admin use)
  static forceSignerReconnect = asyncHandler(async (req: Request, res: Response): Promise<void> => {
    const requestId = req.headers['x-request-id'] as string;
    
    Logger.info('Force signer reconnection requested', { requestId });

    const reconnectResult = await SignerImprovedService.forceReconnect();
    
    if (!reconnectResult.success) {
      throw new ExternalServiceError('Signer', reconnectResult.error?.message || 'Failed to reconnect', requestId);
    }

    Logger.info('Force signer reconnection completed', { requestId });

    res.json({
      success: true,
      message: 'Signer reconnection initiated',
      data: SignerImprovedService.getHealthStatus()
    });
  });
}