/**
 * ${VOCAB.factory} Job Handlers
 * Async handlers for code generation, validation, and deployment
 */

import { prisma } from '@/lib/db';
import { darkFactoryQueue } from './queue';
import { GenerationJobPayload, ValidationJobPayload, DeploymentJobPayload, Job } from './types';
import { eventBus } from '../event-bus';
import { VOCAB } from '@/lib/white-label/constants';

/**
 * Register all ${VOCAB.factory} job handlers
 */
export function registerDarkFactoryHandlers(): void {
  // Generation handler
  darkFactoryQueue.registerHandler<GenerationJobPayload, { taskId: string; success: boolean }>({
    type: 'dark-factory:generate',
    maxAttempts: 2,
    timeout: 120000, // 2 minute timeout for generation
    
    async process(payload, job) {
      const { requestId, prompt, context } = payload;
      
      // Update task status
      await prisma.generationTask.updateMany({
        where: { requestId },
        data: { status: 'generating', startedAt: new Date() },
      });

      // Emit event
      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.generation.started',
        priority: 'high',
        payload: { requestId, jobId: job.id },
      });

      // The actual LLM-powered generation would happen here
      // For now, we simulate the generation process
      const task = await prisma.generationTask.findFirst({
        where: { requestId },
      });

      if (!task) {
        throw new Error(`Task not found for request ${requestId}`);
      }

      // Simulated generation steps (in real implementation, this calls LLM APIs)
      await updateTaskStage(task.id, 'schema_generation', 'running');
      await simulateWork(500);
      await updateTaskStage(task.id, 'schema_generation', 'completed');

      await updateTaskStage(task.id, 'code_generation', 'running');
      await simulateWork(1000);
      await updateTaskStage(task.id, 'code_generation', 'completed');

      // Move to validation
      await prisma.generationTask.update({
        where: { id: task.id },
        data: { status: 'validating' },
      });

      // Enqueue validation job
      await darkFactoryQueue.enqueue('dark-factory:validate', {
        taskId: task.id,
        artifactIds: [], // Would be populated with actual artifact IDs
      }, { priority: payload.priority || 'normal' });

      return { taskId: task.id, success: true };
    },

    async onComplete(job, result) {
      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.generation.completed',
        payload: { jobId: job.id, ...result },
      });
    },

    async onFail(job, error) {
      const { requestId } = job.payload;
      await prisma.generationTask.updateMany({
        where: { requestId },
        data: { status: 'failed', error: error.message },
      });

      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.generation.failed',
        priority: 'high',
        payload: { jobId: job.id, requestId, error: error.message },
      });
    },
  });

  // Validation handler
  darkFactoryQueue.registerHandler<ValidationJobPayload, { passed: boolean; issues: string[] }>({
    type: 'dark-factory:validate',
    maxAttempts: 1, // Validation shouldn't need retries
    timeout: 60000,

    async process(payload) {
      const { taskId, artifactIds } = payload;

      await prisma.generationTask.update({
        where: { id: taskId },
        data: { status: 'validating' },
      });

      await updateTaskStage(taskId, 'validation', 'running');

      // Simulated validation (real implementation would run TypeScript compiler, linters, etc.)
      await simulateWork(500);

      const passed = true; // In real implementation, this would be the validation result
      const issues: string[] = [];

      await updateTaskStage(taskId, 'validation', passed ? 'completed' : 'failed');

      // Move to awaiting approval
      await prisma.generationTask.update({
        where: { id: taskId },
        data: { status: 'awaiting_approval' },
      });

      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.validation.completed',
        payload: { taskId, passed, issues },
      });

      return { passed, issues };
    },
  });

  // Deployment handler
  darkFactoryQueue.registerHandler<DeploymentJobPayload, { success: boolean; deployedCount: number }>({
    type: 'dark-factory:deploy',
    maxAttempts: 2,
    timeout: 60000,

    async process(payload) {
      const { taskId, artifactIds, environment, approvedBy } = payload;

      await prisma.generationTask.update({
        where: { id: taskId },
        data: { status: 'deploying' },
      });

      await updateTaskStage(taskId, 'deployment', 'running');

      // Create deployment record
      const deployment = await prisma.deployment.create({
        data: {
          taskId,
          environment,
          artifactIds: artifactIds,
          status: 'in_progress',
          approvedBy,
        },
      });

      // Simulated deployment (real implementation would write files)
      await simulateWork(1000);

      await prisma.deployment.update({
        where: { id: deployment.id },
        data: { status: 'completed', deployedAt: new Date() },
      });

      await updateTaskStage(taskId, 'deployment', 'completed');

      await prisma.generationTask.update({
        where: { id: taskId },
        data: { status: 'completed', completedAt: new Date() },
      });

      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.deployment.completed',
        payload: { taskId, deploymentId: deployment.id, artifactIds },
      });

      return { success: true, deployedCount: artifactIds.length };
    },

    async onFail(job, error) {
      const { taskId } = job.payload;
      
      await prisma.generationTask.update({
        where: { id: taskId },
        data: { status: 'failed', error: error.message },
      });

      await eventBus.publish({
        source: 'system',
        type: 'dark-factory.deployment.failed',
        priority: 'high',
        payload: { taskId, error: error.message },
      });
    },
  });

  console.log(`[${VOCAB.factory}] Registered async job handlers`);
}

// Helper functions

async function updateTaskStage(
  taskId: string,
  stageName: string,
  status: 'pending' | 'running' | 'completed' | 'failed'
): Promise<void> {
  const task = await prisma.generationTask.findUnique({ where: { id: taskId } });
  if (!task) return;

  const stages = (task.stages as any[]) || [];
  const stageIndex = stages.findIndex((s: any) => s.name === stageName);
  const now = new Date();

  if (stageIndex >= 0) {
    stages[stageIndex] = {
      ...stages[stageIndex],
      status,
      ...(status === 'running' && { startedAt: now }),
      ...(status === 'completed' || status === 'failed' ? { completedAt: now } : {}),
    };
  } else {
    stages.push({
      name: stageName,
      status,
      ...(status === 'running' && { startedAt: now }),
    });
  }

  await prisma.generationTask.update({
    where: { id: taskId },
    data: { stages },
  });
}

async function simulateWork(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}
