"""Viewer regression test: opencode traces must not be mislabelled as Claude Code.

opencode's system prompt begins with "You are opencode, ..." but may also
mention "Claude Code" later (e.g. in agent-builder examples). The sidebar
fingerprint heuristic must prefer the explicit self-identification.
"""

from __future__ import annotations

import json

import pytest

pw_missing = False
try:
    from playwright.sync_api import sync_playwright  # noqa: F401
except ImportError:
    pw_missing = True


@pytest.mark.skipif(pw_missing, reason="playwright not installed")
def test_opencode_prompt_is_labelled_opencode_not_claude_code(tmp_path) -> None:
    from playwright.sync_api import sync_playwright

    from claude_tap.viewer import _generate_html_viewer

    # Mirror the real opencode system prompt shape: opens with the
    # "You are opencode" self-id, then mentions "Claude Code" deep inside
    # an example list. The pre-fix heuristic stopped at the first match
    # and labelled the trace "Claude Code".
    system_prompt = (
        "You are opencode, an interactive CLI tool that helps users with "
        "software engineering tasks.\n"
        "Use the instructions below and the tools available to you to assist the user.\n"
        + ("filler ... " * 200)
        + "\n(4) ask about Claude Code, Cursor, or similar agent internals\n"
        + ("filler ... " * 200)
    )

    trace_path = tmp_path / "trace.jsonl"
    record = {
        "timestamp": "2026-05-01T23:46:43+00:00",
        "request_id": "req_1",
        "turn": 1,
        "duration_ms": 100,
        "request": {
            "method": "POST",
            "path": "/anthropic/v1/messages",
            "headers": {},
            "body": {
                "system": system_prompt,
                "messages": [{"role": "user", "content": [{"type": "text", "text": "ping"}]}],
            },
        },
        "response": {"status": 200, "headers": {}, "body": {"content": [], "usage": {}}},
    }
    trace_path.write_text(json.dumps(record) + "\n", encoding="utf-8")

    html_path = tmp_path / "trace.html"
    _generate_html_viewer(trace_path, html_path)

    with sync_playwright() as p:
        browser = p.chromium.launch()
        page = browser.new_page()
        page.goto(html_path.resolve().as_uri(), wait_until="networkidle")
        label = page.locator(".sidebar-item .si-task").first.inner_text()
        browser.close()

    assert label == "OpenCode", f"opencode trace mislabelled as {label!r}"