/**
 * Intake Service
 * Handles document ingestion, OCR, classification, and routing
 */

import Fastify from 'fastify';
import fastifySwagger from '@fastify/swagger';
import fastifySwaggerUI from '@fastify/swagger-ui';
import {
  errorHandler,
  createLogger,
  registerSecurityPlugins,
  addCorrelationId,
  addRequestLogging,
  getEnv,
  createBodySchema,
  authenticateJWT,
} from '@the-order/shared';
import { CreateDocumentSchema } from '@the-order/schemas';
// import { intakeWorkflow } from '@the-order/workflows'; // Not yet implemented
import { WORMStorage } from '@the-order/storage';
import { healthCheck as dbHealthCheck, getPool, createDocument, updateDocument } from '@the-order/database';
import { OCRClient } from '@the-order/ocr';
import { randomUUID } from 'crypto';

const logger = createLogger('intake-service');

// eslint-disable-next-line @typescript-eslint/no-explicit-any
const server: any = Fastify({
  logger: logger as any,
  requestIdLogLabel: 'requestId',
  disableRequestLogging: false,
});

// Initialize database pool
const env = getEnv();
if (env.DATABASE_URL) {
  getPool({ connectionString: env.DATABASE_URL });
}

// Initialize storage client (WORM mode for document retention)
const storageClient = new WORMStorage({
  provider: env.STORAGE_TYPE || 's3',
  bucket: env.STORAGE_BUCKET,
  region: env.STORAGE_REGION,
});

// Initialize OCR client (for future use)
const ocrClient = new OCRClient(storageClient);
void ocrClient; // Suppress unused variable warning

// Initialize server
async function initializeServer(): Promise<void> {
  // Register Swagger
  const swaggerUrl = env.SWAGGER_SERVER_URL || (env.NODE_ENV === 'development' ? 'http://localhost:4001' : undefined);
  if (!swaggerUrl) {
    logger.warn('SWAGGER_SERVER_URL not set, Swagger documentation will not be available');
  } else {
    await server.register(fastifySwagger, {
      openapi: {
        info: {
          title: 'Intake Service API',
          description: 'Document ingestion, OCR, classification, and routing',
          version: '1.0.0',
        },
        servers: [
          {
            url: swaggerUrl,
            description: env.NODE_ENV || 'Development server',
          },
        ],
      },
    });

    await server.register(fastifySwaggerUI, {
      routePrefix: '/docs',
    });
  }

  await registerSecurityPlugins(server as any);
  addCorrelationId(server as any);
  addRequestLogging(server as any);
  server.setErrorHandler(errorHandler as any);
}

// Health check
server.get(
  '/health',
  {
    schema: {
      description: 'Health check endpoint',
      tags: ['health'],
      response: {
        200: {
          type: 'object',
          properties: {
            status: { type: 'string' },
            service: { type: 'string' },
            database: { type: 'string' },
            storage: { type: 'string' },
          },
        },
      },
    },
  },
  async () => {
    const dbHealthy = await dbHealthCheck();
    const storageHealthy = await storageClient.objectExists('health-check').catch(() => false);

    return {
      status: dbHealthy && storageHealthy ? 'ok' : 'degraded',
      service: 'intake',
      database: dbHealthy ? 'connected' : 'disconnected',
      storage: storageHealthy ? 'accessible' : 'unavailable',
    };
  }
);

// Ingest endpoint
server.post(
  '/ingest',
  {
    preHandler: [authenticateJWT],
    schema: {
      ...createBodySchema(CreateDocumentSchema),
      description: 'Ingest a document for processing',
      tags: ['documents'],
      response: {
        202: {
          type: 'object',
          properties: {
            documentId: { type: 'string', format: 'uuid' },
            status: { type: 'string' },
            message: { type: 'string' },
          },
        },
      },
    },
  },
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    async (request: any, reply: any) => {
    const body = request.body as {
      title: string;
      type: string;
      content?: string;
      fileUrl?: string;
    };

    const documentId = randomUUID();
    const userId = request.user?.id || 'system';

    // Upload to WORM storage if content provided
    let fileUrl = body.fileUrl;
    let storageKey: string | undefined;
    if (body.content) {
      storageKey = `documents/${documentId}`;
      await storageClient.upload({
        key: storageKey,
        content: Buffer.from(body.content),
        contentType: 'application/pdf',
        metadata: {
          title: body.title,
          type: body.type,
          userId,
        },
      });
      fileUrl = storageKey;
    }

    // Create document record
    const document = await createDocument({
      title: body.title,
      type: body.type,
      file_url: fileUrl,
      storage_key: storageKey,
      user_id: userId,
      status: 'processing',
    });

    // Trigger intake workflow (commented out until implemented)
    // const workflowResult = await intakeWorkflow(
    //   {
    //     documentId: document.id,
    //     fileUrl: fileUrl || '',
    //     userId,
    //   },
    //   ocrClient,
    //   storageClient
    // );
    // Placeholder workflow result
    const workflowResult = {
      status: 'processing',
      classification: body.type || 'unknown',
      extractedData: body.content ? JSON.parse(body.content) : {},
    };

    // Update document with workflow results
    await updateDocument(document.id, {
      status: 'processed',
      classification: workflowResult.classification,
      ocr_text: typeof workflowResult.extractedData === 'object' && workflowResult.extractedData !== null
        ? (workflowResult.extractedData as { ocrText?: string }).ocrText
        : undefined,
      extracted_data: workflowResult.extractedData,
    });

    return reply.status(202).send({
      documentId: document.id,
      status: 'processing',
      message: 'Document ingestion started',
      classification: workflowResult.classification,
    });
  }
);

// Start server
const start = async () => {
  try {
    await initializeServer();
    const env = getEnv();
    const port = env.PORT || 4001;
    await server.listen({ port, host: '0.0.0.0' });
    logger.info({ port }, 'Intake service listening');
  } catch (err) {
    logger.error({ err }, 'Failed to start server');
    process.exit(1);
  }
};

start();