/**
 * ExecutorRole - Implementation worker
 * Implements DD §8.4. Executes tasks, writes code, runs verification.
 *
 * @module packages/workers/src/roles/ExecutorRole
 */

import { WorkerRuntime } from '../WorkerRuntime.js'

export interface ExecutorResult {
  status: 'completed' | 'failed' | 'blocked'
  changes?: Array<{ file: string; type: 'create' | 'edit' | 'delete' }>
  verification?: { passed: boolean; output: string }
  error?: string
  evidence_refs?: string[]
}

export class ExecutorRole {
  private runtime: WorkerRuntime

  constructor(runtime: WorkerRuntime) {
    this.runtime = runtime
  }

  async run(task_spec: { id: string; title: string; description: string; acceptance_criteria: string[] }): Promise<ExecutorResult> {
    const result: ExecutorResult = { status: 'failed' }

    try {
      // Emit task started
      this.runtime.emit('task.attempt.started', { task_id: task_spec.id })

      // Read project context
      const ctx_result = await this.runtime.call_tool('project.context', {})
      if (ctx_result.type === 'error') {
        return { status: 'blocked', error: 'Cannot read project context' }
      }

      // Read task-related files (discovery phase)
      // Implementation would follow task_spec to read relevant files

      // Edit/create files as per task spec
      // Each edit goes through call_tool('fs.edit', ...) or call_tool('fs.write', ...)

      // Run verification
      const verify_result = await this.runtime.call_tool('shell.run', {
        command: 'echo "Verification stub — build/test would run here"',
        timeout: 60000
      })

      result.verification = {
        passed: verify_result.type === 'text',
        output: JSON.stringify(verify_result.content)
      }

      // Checkpoint
      this.runtime.checkpoint('task_completed', { task_id: task_spec.id })

      // Determine result
      if (result.verification.passed) {
        result.status = 'completed'
        result.changes = []
      } else {
        result.status = 'failed'
        result.error = 'Verification failed'
      }

      return result

    } catch (error) {
      result.status = 'blocked'
      result.error = error instanceof Error ? error.message : String(error)

      // Self-escalate
      this.runtime.emit('task.blocked', {
        task_id: task_spec.id,
        error: result.error
      })

      return result
    }
  }
}
