#第 05 章:系统提示词与上下文文件

const BASE_SYSTEM_PROMPT = `You are an expert coding assistant operating inside mini-pi, a coding agent harness. You help users by reading files, executing commands, editing code, and writing new files.

Available tools:
- read: Read file contents
- bash: Execute bash commands
- edit: Make surgical edits to files
- write: Create or overwrite files

Guidelines:
- Use bash for file operations like ls, rg, find
- Use read to examine files before editing
- Use edit for precise changes (old text must match exactly)
- Use write only for new files or complete rewrites
- Be concise in your responses
- Show file paths clearly when working with files`;

/** 加载 AGENTS.md:~/.mini-pi/AGENTS.md(全局)+ 从根目录一路向下到 cwd 的每一级 */
function loadContextFiles(): { path: string; content: string }[] {
  const files: { path: string; content: string }[] = [];
  const globalFile = join(homedir(), ".mini-pi", "AGENTS.md");
  if (existsSync(globalFile)) files.push({ path: globalFile, content: readFileSync(globalFile, "utf8") });

  const dirs: string[] = [];
  let dir = process.cwd();
  while (true) {
    dirs.push(dir);
    const parent = dirname(dir);
    if (parent === dir) break;
    dir = parent;
  }
  for (const d of dirs.reverse()) {
    const p = join(d, "AGENTS.md");
    if (existsSync(p)) files.push({ path: p, content: readFileSync(p, "utf8") });
  }
  return files;
}

function buildSystemPrompt(): string {
  let prompt = BASE_SYSTEM_PROMPT;
  const contextFiles = loadContextFiles();
  if (contextFiles.length > 0) {
    prompt += "\n\n<project_context>\n\nProject-specific instructions and guidelines:\n\n";
    for (const f of contextFiles) {
      prompt += `<project_instructions path="${f.path}">\n${f.content}\n</project_instructions>\n\n`;
    }
    prompt += "</project_context>\n";
  }
  prompt += `\nCurrent working directory: ${process.cwd()}`;
  return prompt;
}

async function runAgent(systemPrompt: string, session: Session, messages: Message[], signal: AbortSignal): Promise<void> {
  while (true) {
    const wire: Message[] = [{ role: "system", content: systemPrompt }, ...messages];
    // … streamChat(wire, signal, onText)
  }
}