// 零件提交：沙盒驗收 → 派發 hash id → 寫入 SUBMISSIONS_KV → 上傳 R2
// Requirements: 2.1, 2.2, 2.3
//
// KV key 設計：
//   comp:{hash_id}:{version}  → 零件元數據 JSON
//   idx:{canonical_id}        → hash_id 反查索引（canonical_id → hash_id）
//
// hash_id 派發規則：
//   hash_id = 'cmp_' + sha256(canonical_id).slice(0, 8)
//   相同 canonical_id 永遠得到相同 hash_id（冪等）
//   不同 canonical_id 的 hash_id 碰撞機率極低（2^32 空間）

import { runSandboxAcceptance } from './sandboxAcceptance';
import type { ComponentContract, SandboxResult, Bindings } from '../types';

// ── hash id 生成 ─────────────────────────────────────────────────────────────

async function deriveHashId(canonicalId: string): Promise<string> {
  const encoder = new TextEncoder();
  const data = encoder.encode(canonicalId);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const hex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
  return 'cmp_' + hex.slice(0, 8);
}

// ── 主流程 ────────────────────────────────────────────────────────────────────

export async function submitComponent(
  wasmBytes: Uint8Array,
  contract: ComponentContract,
  env: Bindings,
): Promise<SandboxResult & { wasm_r2_key?: string }> {
  // 1. 沙盒驗收
  const sandboxResult = runSandboxAcceptance(wasmBytes, contract);
  if (!sandboxResult.success) {
    return sandboxResult;
  }

  // 2. 派發 hash id（canonical_id 的確定性 hash，相同輸入永遠得到相同 id）
  const hashId = await deriveHashId(contract.canonical_id);

  const kvKey = `comp:${hashId}:${contract.version}`;
  const r2Key = `components/${hashId}/${contract.version}.wasm`;

  // 3. 冪等：若已存在相同 (hash_id, version) 直接回傳
  const existing = await env.SUBMISSIONS_KV.get(kvKey);
  if (existing) {
    return {
      success: true,
      component_hash_id: hashId,
      canonical_id: contract.canonical_id,
      version: contract.version,
      wasm_r2_key: r2Key,
    };
  }

  // 4. 上傳 .wasm 至 R2
  await env.WASM_BUCKET.put(r2Key, wasmBytes, {
    httpMetadata: { contentType: 'application/wasm' },
  });

  // 5. 寫入 SUBMISSIONS_KV（元數據 + 初始統計）
  const record = {
    component_hash_id: hashId,
    canonical_id: contract.canonical_id,
    display_name: contract.display_name,
    category: contract.category,
    version: contract.version,
    wasi_target: contract.wasi_target,
    stability: contract.stability,
    runtime_compat: contract.runtime_compat,
    component_type: contract.component_type ?? 'wasm',
    constraints: contract.constraints,
    input_schema: contract.input_schema,
    output_schema: contract.output_schema,
    gherkin_tests: contract.gherkin_tests,
    wasm_r2_key: r2Key,
    description: contract.description ?? '',
    aliases: contract.aliases ?? [],
    tags: contract.tags ?? [],
    // 初始統計
    success_rate: 1,
    avg_duration_ms: 0,
    call_count: 0,
    // 可見性：預設 author_only，人工審核通過後改為 public
    visibility: 'author_only' as const,
    status: 'active' as const,
    submitted_at: new Date().toISOString(),
    deprecated_at: null,
  };

  await env.SUBMISSIONS_KV.put(kvKey, JSON.stringify(record));

  // 6. 寫入 canonical_id → hash_id 反查索引
  //    同一個 canonical_id 的所有版本共用同一個 hash_id，索引只需存一份
  await env.SUBMISSIONS_KV.put(`idx:${contract.canonical_id}`, hashId);

  return {
    success: true,
    component_hash_id: hashId,
    canonical_id: contract.canonical_id,
    version: contract.version,
    wasm_r2_key: r2Key,
  };
}