/**
 * Context Tools - Context assembly and compaction triggers
 *
 * Implements T-211: context.assemble, context.compact
 * Wraps ContextAssembler (available P3). Stub acceptable in P2.
 *
 * @module packages/runtime/src/tools/context
 */

import type { ToolDefinition, ToolCall, ToolResultEnvelope, ISOTimeString } from '@aircoding/contracts'

export const context_assemble: ToolDefinition = {
  name: 'context.assemble',
  category: 'context',
  description: 'Assemble context for current task',
  input_schema: {
    type: 'object',
    properties: {
      task_id: { type: 'string', description: 'Task ID to assemble context for' },
      max_tokens: { type: 'number', default: 100000, description: 'Maximum tokens' }
    }
  },
  permissions: { read: true, write: false, network: false },
  streaming: false
}

export const context_compact: ToolDefinition = {
  name: 'context.compact',
  category: 'context',
  description: 'Trigger context compaction',
  input_schema: {
    type: 'object',
    properties: {
      mode: { type: 'string', enum: ['auto', 'force', 'preview'], default: 'auto' },
      target_tokens: { type: 'number', description: 'Target token count' }
    }
  },
  permissions: { read: false, write: true, network: false },
  streaming: false
}

// Stub executor - actual implementation wraps ContextAssembler (P3)
export function createContextExecutor() {
  return {
    'context.assemble': async (call: ToolCall): Promise<ToolResultEnvelope> => {
      const { task_id, max_tokens = 100000 } = call.arguments as { task_id?: string; max_tokens?: number }
      // Stub: would call ContextAssembler.assemble()
      return create_result(call.id, 'context.assemble', 'text', {
        task_id: task_id || 'unknown',
        max_tokens,
        assembled_tokens: 50000,
        message: 'Context assembled (stub - P3 implementation pending)'
      })
    },

    'context.compact': async (call: ToolCall): Promise<ToolResultEnvelope> => {
      const { mode = 'auto', target_tokens } = call.arguments as { mode?: string; target_tokens?: number }
      // Stub: would call ContextAssembler.compact()
      return create_result(call.id, 'context.compact', 'text', {
        mode,
        target_tokens: target_tokens || 80000,
        current_tokens: 95000,
        compacted_tokens: 75000,
        message: 'Context compacted (stub - P3 implementation pending)'
      })
    }
  }
}

function create_result(call_id: string, tool_name: string, type: 'text' | 'error', content: Record<string, unknown>): ToolResultEnvelope {
  return { call_id, tool_name, type, content, metadata: { timestamp: new Date().toISOString() as ISOTimeString } }
}