/**
 * acr parts          — 列出所有可用零件（按類型分組，含統計與 author）
 * acr parts scaffold <component> — 輸出 config 範本
 * acr parts publish <component>  — 提交零件至公眾 registry
 */
import { readFileSync, existsSync } from 'node:fs';
import { join } from 'node:path';
import chalk from 'chalk';
import ora from 'ora';
import { loadConfig } from '../lib/config.js';

const REGISTRY_URL = 'https://registry.arcrun.dev';

interface ComponentInfo {
  canonical_id: string;
  display_name: string;
  category: string;
  description: string;
  author?: string;
  total_runs?: number;
  success_rate?: number;
  avg_duration_ms?: number;
  visibility?: 'public' | 'author_only';
  credentials_required?: Array<{ key: string; type: string; inject_as: string }>;
}

export async function cmdParts(): Promise<void> {
  const spinner = ora('從 registry.arcrun.dev 取得零件清單').start();

  let components: ComponentInfo[] = [];
  try {
    const res = await fetch(`${REGISTRY_URL}/components`);
    if (res.ok) {
      const data = await res.json() as { components: ComponentInfo[] };
      components = data.components ?? [];
    }
    spinner.stop();
  } catch {
    spinner.stop();
    console.log(chalk.yellow('  無法連線 registry.arcrun.dev，顯示本地零件清單\n'));
  }

  if (components.length === 0) {
    // fallback：顯示本地 registry 目錄中的零件
    components = loadLocalComponents();
  }

  // 依 category 分組
  const grouped: Record<string, ComponentInfo[]> = {};
  for (const comp of components) {
    const cat = comp.category ?? 'other';
    if (!grouped[cat]) grouped[cat] = [];
    grouped[cat].push(comp);
  }

  const categoryLabels: Record<string, string> = {
    api: '整合類（Integration）',
    logic: '控制類（Control Flow）',
    data: '資料類（Data）',
    ai: 'AI 類',
    other: '其他',
  };

  console.log(chalk.bold('\n  arcrun 零件庫\n'));

  for (const [cat, comps] of Object.entries(grouped)) {
    console.log(chalk.bold.underline(`  ${categoryLabels[cat] ?? cat}`));
    for (const comp of comps) {
      const isAuthorOnly = comp.visibility === 'author_only';
      const tag = isAuthorOnly ? chalk.yellow(' [待審核]') : '';

      let statsLine = '';
      if (!isAuthorOnly && comp.total_runs !== undefined) {
        const rate = ((comp.success_rate ?? 1) * 100).toFixed(1);
        const runs = comp.total_runs.toLocaleString();
        const ms = Math.round(comp.avg_duration_ms ?? 0);
        statsLine = chalk.gray(`       ★ ${rate}% 成功  |  ${runs} 次執行  |  平均 ${ms}ms`);
      }

      const authorStr = comp.author ? chalk.gray(` by ${comp.author}`) : '';
      const credStr = comp.credentials_required?.length
        ? chalk.yellow(`  🔑 需要 ${comp.credentials_required.map(c => c.key).join(', ')}`)
        : '';

      console.log(`  • ${chalk.cyan(comp.canonical_id.padEnd(20))}${comp.display_name}${tag}${authorStr}${credStr}`);
      if (statsLine) console.log(statsLine);
    }
    console.log('');
  }

  console.log(chalk.gray('  使用 acr parts scaffold <component> 取得 config 範本'));
  console.log(chalk.gray('  使用 acr parts publish <component> 提交零件至公眾庫\n'));
}

export async function cmdPartsScaffold(componentId: string): Promise<void> {
  // 優先從本地 registry 讀取 contract.yaml
  const localContract = loadLocalContract(componentId);

  if (!localContract) {
    // 嘗試從 registry.arcrun.dev 取得
    try {
      const res = await fetch(`${REGISTRY_URL}/components/${componentId}/contract`);
      if (!res.ok) {
        console.error(chalk.red(`零件 "${componentId}" 不存在，執行 acr parts 查看可用清單`));
        process.exit(1);
      }
      const data = await res.json() as { config_example?: string; credentials_required?: unknown[] };
      printScaffold(componentId, data.config_example, data.credentials_required as ComponentInfo['credentials_required']);
    } catch {
      console.error(chalk.red(`無法取得 "${componentId}" 的 contract，請確認零件名稱`));
      process.exit(1);
    }
    return;
  }

  const configExample = extractYamlField(localContract, 'config_example');
  const credsRequired = extractCredentialsRequired(localContract);
  printScaffold(componentId, configExample, credsRequired);
}

function printScaffold(
  componentId: string,
  configExample?: string,
  credsRequired?: ComponentInfo['credentials_required'],
): void {
  console.log(chalk.bold(`\n  ${componentId} — workflow.yaml config 範本\n`));

  if (configExample) {
    console.log(chalk.cyan('  # 貼入 workflow.yaml 的 config: 區塊'));
    console.log(configExample.split('\n').map(l => `  ${l}`).join('\n'));
  } else {
    console.log(chalk.yellow('  （無 config_example，請參考文檔）'));
  }

  if (credsRequired && credsRequired.length > 0) {
    console.log(chalk.bold('\n  credentials.yaml 範本（加入後執行 acr creds push）\n'));
    for (const cred of credsRequired) {
      console.log(chalk.cyan(`  # ${cred.type}（${cred.inject_as} 欄位自動注入）`));
      console.log(`  ${cred.key}: "your-${cred.type}-token"\n`);
    }
  }
}

export async function cmdPartsPublish(componentDir: string, options: { status?: string }): Promise<void> {
  if (options.status) {
    // 查詢審核進度
    try {
      const res = await fetch(`${REGISTRY_URL}/submit/status/${options.status}`);
      const data = await res.json() as { status: string; visibility?: string; failed_step?: string; reason?: string; approved_at?: string };
      console.log(chalk.bold(`\n  提交狀態：${options.status}\n`));
      console.log(`  狀態：${data.status}`);
      if (data.visibility) console.log(`  Visibility：${data.visibility}`);
      if (data.failed_step) console.log(chalk.red(`  失敗步驟：${data.failed_step}`));
      if (data.reason) console.log(chalk.red(`  原因：${data.reason}`));
      if (data.approved_at) console.log(chalk.green(`  核准時間：${data.approved_at}`));
    } catch (e) {
      console.error(chalk.red(`查詢失敗：${e instanceof Error ? e.message : e}`));
    }
    return;
  }

  const config = loadConfig();
  if (!config.api_key) {
    console.error(chalk.red('缺少 API Key，請執行 acr init'));
    process.exit(1);
  }

  // 讀取零件目錄
  const contractPath = join(componentDir, 'component.contract.yaml');
  const mainGoPath = join(componentDir, 'main.go');
  const wasmName = componentDir.split('/').pop() ?? componentDir;
  const wasmPath = join(componentDir, `${wasmName}.wasm`);

  if (!existsSync(contractPath)) {
    console.error(chalk.red(`找不到 ${contractPath}`));
    process.exit(1);
  }
  if (!existsSync(wasmPath)) {
    console.error(chalk.red(`找不到 ${wasmPath}（請先編譯：tinygo build -o ${wasmName}.wasm -target wasi .）`));
    process.exit(1);
  }

  const spinner = ora('提交零件至 registry.arcrun.dev').start();

  const formData = new FormData();
  formData.append('contract', new Blob([readFileSync(contractPath)], { type: 'application/yaml' }), 'component.contract.yaml');
  if (existsSync(mainGoPath)) {
    formData.append('source', new Blob([readFileSync(mainGoPath)], { type: 'text/plain' }), 'main.go');
  }
  formData.append('wasm', new Blob([readFileSync(wasmPath)], { type: 'application/wasm' }), `${wasmName}.wasm`);

  try {
    const res = await fetch(`${REGISTRY_URL}/submit`, {
      method: 'POST',
      headers: { 'X-Arcrun-API-Key': config.api_key },
      body: formData,
    });

    if (!res.ok) {
      const err = await res.text();
      spinner.fail(chalk.red(`提交失敗（${res.status}）：${err.slice(0, 200)}`));
      process.exit(1);
    }

    const data = await res.json() as { submission_id: string; status: string; visibility?: string };
    spinner.succeed(chalk.green(`✓ 提交成功`));
    console.log(`\n  Submission ID：${chalk.cyan(data.submission_id)}`);
    console.log(`  狀態：${data.status}`);
    if (data.visibility) console.log(`  Visibility：${data.visibility}`);
    console.log(chalk.gray(`\n  查詢進度：acr parts publish --status ${data.submission_id}\n`));
  } catch (e) {
    spinner.fail(chalk.red(`提交失敗：${e instanceof Error ? e.message : e}`));
    process.exit(1);
  }
}

// ── helpers ──────────────────────────────────────────────────────────────────

function loadLocalComponents(): ComponentInfo[] {
  // 嘗試從相對路徑尋找 registry/components
  const dirs = [
    join(process.cwd(), 'registry/components'),
    join(process.cwd(), '../registry/components'),
  ];

  for (const dir of dirs) {
    if (existsSync(dir)) {
      const components: ComponentInfo[] = [];
      const { readdirSync } = require('node:fs');
      for (const name of readdirSync(dir)) {
        const contractPath = join(dir, name, 'component.contract.yaml');
        if (existsSync(contractPath)) {
          const raw = readFileSync(contractPath, 'utf8');
          const canonical_id = extractYamlScalar(raw, 'canonical_id') ?? name;
          const display_name = extractYamlScalar(raw, 'display_name') ?? name;
          const category = extractYamlScalar(raw, 'category') ?? 'other';
          const description = extractYamlScalar(raw, 'description') ?? '';
          components.push({ canonical_id, display_name, category, description });
        }
      }
      return components;
    }
  }
  return [];
}

function loadLocalContract(componentId: string): string | null {
  const dirs = [
    join(process.cwd(), `registry/components/${componentId}/component.contract.yaml`),
    join(process.cwd(), `../registry/components/${componentId}/component.contract.yaml`),
  ];
  for (const p of dirs) {
    if (existsSync(p)) return readFileSync(p, 'utf8');
  }
  return null;
}

function extractYamlScalar(yaml: string, key: string): string | undefined {
  const m = yaml.match(new RegExp(`^${key}:\\s*["']?([^"'\\n]+)["']?`, 'm'));
  return m?.[1]?.trim();
}

function extractYamlField(yaml: string, field: string): string | undefined {
  const m = yaml.match(new RegExp(`^${field}:\\s*\\|\\n((?:[ \\t]+[^\\n]*\\n?)*)`, 'm'));
  return m?.[1];
}

function extractCredentialsRequired(yaml: string): ComponentInfo['credentials_required'] {
  const section = yaml.match(/credentials_required:\s*([\s\S]*?)(?=\n\w|\n#|$)/);
  if (!section) return [];
  const items: ComponentInfo['credentials_required'] = [];
  const blocks = section[1].split(/\n  - /).slice(1);
  for (const block of blocks) {
    const key = block.match(/key:\s*["']?([^"'\n]+)["']?/)?.[1]?.trim();
    const type = block.match(/type:\s*["']?([^"'\n]+)["']?/)?.[1]?.trim();
    const inject_as = block.match(/inject_as:\s*["']?([^"'\n]+)["']?/)?.[1]?.trim();
    if (key && type && inject_as) {
      items!.push({ key, type, inject_as });
    }
  }
  return items;
}