/**
 * acr run <workflow_name> [--input key=value...]
 *
 * 玩法一（Standard / Local）：
 *   在本機找 <workflow_name>.yaml，解析 triplets + config，
 *   直接 POST /cypher/execute 給 cypher.arcrun.dev 執行。
 *   YAML 不存在 KV，每次執行都帶著走。
 *
 * 玩法二（Self-hosted，workflow 已 push 到 KV）：
 *   POST /webhooks/<workflow_name>，executor 從 WEBHOOKS KV 讀取定義執行。
 */
import chalk from 'chalk';
import ora from 'ora';
import { existsSync, readFileSync } from 'node:fs';
import { loadConfig, getCypherExecutorUrl } from '../lib/config.js';
import { loadWorkflowYaml, parseTriplets } from '../lib/yaml-parser.js';

interface RunOptions {
  input?: string[];
}

export async function cmdRun(workflowName: string, options: RunOptions): Promise<void> {
  const config = loadConfig();
  const executorUrl = getCypherExecutorUrl(config);

  // 解析 --input key=value 為 JSON object
  const inputContext: Record<string, string> = {};
  for (const pair of (options.input ?? [])) {
    const idx = pair.indexOf('=');
    if (idx < 0) {
      console.error(chalk.red(`--input 格式錯誤：${pair}（應為 key=value）`));
      process.exit(1);
    }
    inputContext[pair.slice(0, idx)] = pair.slice(idx + 1);
  }

  const headers: Record<string, string> = { 'Content-Type': 'application/json' };
  if (config.api_key) headers['X-Arcrun-API-Key'] = config.api_key;

  // ── 玩法一：Standard 模式，YAML 在本機，帶著打 /cypher/execute ──────────────
  if (config.mode === 'standard' || config.mode === 'local') {
    const yamlPath = findWorkflowYaml(workflowName);
    if (!yamlPath) {
      console.error(chalk.red(`找不到 ${workflowName}.yaml（在目前目錄或子目錄尋找）`));
      console.error(chalk.gray('玩法二（已 push 到 KV）請改用 Self-hosted 模式'));
      process.exit(1);
    }

    let workflow;
    try {
      workflow = loadWorkflowYaml(yamlPath);
    } catch (e) {
      console.error(chalk.red(`YAML 解析失敗：${e instanceof Error ? e.message : e}`));
      process.exit(1);
    }

    const triplets = parseTriplets(workflow.flow);

    const spinner = ora(`執行 workflow "${workflow.name}"`).start();

    try {
      const res = await fetch(`${executorUrl}/cypher/execute`, {
        method: 'POST',
        headers,
        body: JSON.stringify({
          triplets: workflow.flow,
          context: { ...inputContext, ...(workflow.config ?? {}) },
          graph_id: workflow.name,
          graph_name: workflow.name,
        }),
      });

      const data = await res.json() as {
        success: boolean;
        data?: unknown;
        error?: string;
        trace?: Array<{ node: string; status: string; error?: string }>;
        duration_ms: number;
        failed_node?: string;
      };

      printResult(spinner, data, triplets.length);
    } catch (e) {
      spinner.fail(chalk.red(`網路錯誤：${e instanceof Error ? e.message : e}`));
      process.exit(1);
    }
    return;
  }

  // ── 玩法二：Self-hosted，workflow 已存在 KV，打 /webhooks/{name} ─────────────
  const spinner = ora(`執行 workflow "${workflowName}"`).start();
  try {
    const res = await fetch(`${executorUrl}/webhooks/${workflowName}`, {
      method: 'POST',
      headers,
      body: JSON.stringify(inputContext),
    });

    const data = await res.json() as {
      success: boolean;
      data?: unknown;
      error?: string;
      trace?: Array<{ node: string; status: string; error?: string }>;
      duration_ms: number;
      failed_node?: string;
    };

    printResult(spinner, data, 0);
  } catch (e) {
    spinner.fail(chalk.red(`網路錯誤：${e instanceof Error ? e.message : e}`));
    process.exit(1);
  }
}

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

function findWorkflowYaml(name: string): string | null {
  const candidates = [
    `${name}.yaml`,
    `${name}.yml`,
    `workflows/${name}.yaml`,
    `workflows/${name}.yml`,
  ];
  for (const p of candidates) {
    if (existsSync(p)) return p;
  }
  return null;
}

function printResult(
  spinner: ReturnType<typeof ora>,
  data: { success: boolean; data?: unknown; error?: string; trace?: Array<{ node: string; status: string; error?: string }>; duration_ms: number; failed_node?: string },
  _nodeCount: number,
): void {
  if (data.success) {
    spinner.succeed(chalk.green(`✓ 執行成功（${data.duration_ms}ms）`));
    if (data.data !== undefined && data.data !== null) {
      console.log('\n  結果：');
      console.log(JSON.stringify(data.data, null, 2).split('\n').map(l => `  ${l}`).join('\n'));
    }
  } else {
    spinner.fail(chalk.red(`✗ 執行失敗（${data.duration_ms}ms）`));
    if (data.failed_node) console.log(chalk.red(`\n  失敗節點：${data.failed_node}`));
    if (data.error) console.log(chalk.red(`  錯誤：${data.error}`));
    if (data.trace) {
      console.log('\n  執行追蹤：');
      for (const step of data.trace) {
        const icon = step.status === 'failed' ? chalk.red('✗') : chalk.green('✓');
        console.log(`    ${icon} ${step.node}${step.error ? ` — ${step.error}` : ''}`);
      }
    }
  }
}