"""Render a Claude Code stream-json transcript as Markdown. Nothing is dropped or edited."""
import json
import sys


def fence(text, lang=""):
    ticks = "````" if "```" in text else "```"
    return f"{ticks}{lang}\n{text}\n{ticks}\n"


def as_text(content):
    if isinstance(content, str):
        return content
    parts = []
    for c in content or []:
        if c.get("type") == "text":
            parts.append(c["text"])
        else:
            parts.append(json.dumps(c, ensure_ascii=False))
    return "\n".join(parts)


def main(path):
    out = ["# Agent transcript\n"]
    step = 0
    with open(path) as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            ev = json.loads(line)
            kind = ev.get("type")
            if kind == "system" and ev.get("subtype") == "init":
                out.append(f"- model: `{ev.get('model')}`")
                out.append(f"- claude code: `{ev.get('claude_code_version', '?')}`")
                out.append(f"- tools: {', '.join('`'+t+'`' for t in ev.get('tools', []))}")
                servers = ", ".join(f"`{s['name']}` ({s['status']})" for s in ev.get("mcp_servers", []))
                out.append(f"- mcp servers: {servers}\n")
            elif kind == "assistant":
                for c in ev["message"].get("content", []):
                    if c["type"] == "text" and c["text"].strip():
                        out.append(f"### Agent\n\n{c['text'].strip()}\n")
                    elif c["type"] == "tool_use":
                        step += 1
                        args = json.dumps(c["input"], indent=2, ensure_ascii=False)
                        out.append(f"### Step {step}: `{c['name']}`\n")
                        out.append(fence(args, "json"))
            elif kind == "user":
                content = ev["message"].get("content", [])
                if isinstance(content, str):
                    out.append(f"### User\n\n{content.strip()}\n")
                    continue
                for c in content:
                    if c.get("type") == "tool_result":
                        label = "Result (error)" if c.get("is_error") else "Result"
                        out.append(f"<details><summary>{label}</summary>\n")
                        out.append(fence(as_text(c.get("content"))))
                        out.append("</details>\n")
                    elif c.get("type") == "text":
                        out.append(f"### User\n\n{c['text'].strip()}\n")
            elif kind == "result":
                out.append("## Result\n")
                for key in ("subtype", "num_turns", "duration_ms", "total_cost_usd", "is_error"):
                    if key in ev:
                        out.append(f"- {key}: `{ev[key]}`")
                out.append("")
    print("\n".join(out))


if __name__ == "__main__":
    main(sys.argv[1])