"""#3554 / #3732: an OpenCode upgrade must not leave a dead graphify plugin behind.

Until 0.9.74 `graphify opencode install` wrote a plugin with only a named
export, the OpenCode 1 shape. OpenCode 2 refuses it ("Plugin must export a
default definition ...") and also fails on the opencode.json entry written next
to it. Upgrading graphify did not touch either file, so the user had to know to
run the install again in every project. The CLI now rewrites such a plugin on
its next run.
"""
from __future__ import annotations

import contextlib
import json
import subprocess
import sys
from pathlib import Path

import pytest

import graphify.__main__ as mainmod
from graphify.install import __version__, _OPENCODE_PLUGIN_JS

# The plugin exactly as 0.9.74 wrote it.
V1_PLUGIN = '''\
// graphify OpenCode plugin
// Injects a knowledge graph reminder before bash tool calls when the graph exists.
//
// IMPORTANT: keep the reminder string free of backticks and $(...) constructs.
// The hook prepends `echo "<reminder>" && <cmd>` to the user's bash command;
// backticks inside the double-quoted echo trigger bash command substitution,
// which both corrupts tool output and silently executes the very graphify
// command we are only suggesting. Plain words render fine in opencode's TUI.
import { existsSync } from "fs";
import { join } from "path";

export const GraphifyPlugin = async ({ directory }) => {
  let reminded = false;

  return {
    "tool.execute.before": async (input, output) => {
      if (reminded) return;
      if (!existsSync(join(directory, "graphify-out", "graph.json"))) return;

      if (input.tool === "bash") {
        // ';' not '&&' — Windows PowerShell 5.1 rejects '&&' as a statement
        // separator, breaking the first bash command of the session (#1646).
        output.args.command =
          'echo "[graphify] knowledge graph at graphify-out/. For focused questions, run graphify query with your question (scoped subgraph, usually much smaller than GRAPH_REPORT.md) instead of grepping raw files. Read GRAPH_REPORT.md only for broad architecture context." ; ' +
          output.args.command;
        reminded = true;
      }
    },
  };
};
'''
ENTRY = ".opencode/plugins/graphify.js"


# getattr: on a checkout without the fix the tests fail one by one, not at import.
_real_version_check = getattr(mainmod, "_opencode_loads_current_plugin", None)


@pytest.fixture(autouse=True)
def _refresh_enabled(monkeypatch):
    """Refresh on, and an OpenCode that can load the current plugin, unless a
    test says otherwise. No test runs whatever `opencode` is on the real PATH."""
    monkeypatch.delenv("GRAPHIFY_NO_AUTO_REFRESH", raising=False)
    monkeypatch.setattr(mainmod, "_opencode_loads_current_plugin", lambda: True, raising=False)


def _old_install(directory: Path, body: str = V1_PLUGIN, entry: bool = True) -> tuple[Path, Path]:
    """Lay down the plugin and the config entry as an older release left them."""
    plugin = directory / ".opencode" / "plugins" / "graphify.js"
    plugin.parent.mkdir(parents=True, exist_ok=True)
    plugin.write_text(body, encoding="utf-8")
    config = directory / ".opencode" / "opencode.json"
    settings = {"model": "some/model", **({"plugin": [ENTRY]} if entry else {})}
    config.write_text(json.dumps(settings), encoding="utf-8")
    return plugin, config


def test_the_old_plugin_is_what_opencode_2_rejects():
    """Guard the fixture: the 0.9.74 file has no default export, and both
    files open with the line the refresh recognises graphify's plugin by."""
    assert "export default" not in V1_PLUGIN
    assert "export default" in _OPENCODE_PLUGIN_JS
    assert V1_PLUGIN.startswith(mainmod._OPENCODE_PLUGIN_HEADER)
    assert _OPENCODE_PLUGIN_JS.startswith(mainmod._OPENCODE_PLUGIN_HEADER)


def test_a_v1_plugin_in_the_working_directory_is_rewritten(tmp_path, monkeypatch, capsys):
    plugin, config = _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS
    assert json.loads(config.read_text(encoding="utf-8")) == {"model": "some/model"}
    out, err = capsys.readouterr()
    assert out == "", "stdout stays clean for --json and the MCP stdio server"
    assert f"graphify: refreshed {plugin.resolve()}" in err
    assert "GRAPHIFY_NO_AUTO_REFRESH=1" in err


def test_a_v1_plugin_in_the_home_directory_is_rewritten(tmp_path, monkeypatch, capsys):
    """`graphify opencode install` run from ~ puts the plugin in ~/.opencode,
    and OpenCode loads that for every project below home."""
    plugin, config = _old_install(Path.home())
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS
    assert "plugin" not in json.loads(config.read_text(encoding="utf-8"))
    assert "graphify: refreshed" in capsys.readouterr().err


def test_a_second_run_is_silent(tmp_path, monkeypatch, capsys):
    _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)
    mainmod._refresh_v1_opencode_plugins()
    capsys.readouterr()

    mainmod._refresh_v1_opencode_plugins()

    assert capsys.readouterr().err == ""


def test_running_from_home_checks_it_once(monkeypatch, capsys):
    plugin, _config = _old_install(Path.home())
    monkeypatch.chdir(Path.home())

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS
    assert capsys.readouterr().err.count("graphify: refreshed") == 1


def test_a_stale_entry_beside_a_current_plugin_is_dropped(tmp_path, monkeypatch, capsys):
    """The entry can come back without the old plugin: a checkout that restores
    opencode.json, or an earlier run that wrote the plugin and then failed."""
    plugin, config = _old_install(tmp_path, _OPENCODE_PLUGIN_JS)
    stamp = plugin.stat().st_mtime_ns
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.stat().st_mtime_ns == stamp
    assert json.loads(config.read_text(encoding="utf-8")) == {"model": "some/model"}
    out, err = capsys.readouterr()
    assert out == ""
    assert f"graphify: removed the stale graphify entry from {config.resolve()}" in err

    mainmod._refresh_v1_opencode_plugins()
    assert capsys.readouterr().err == ""


def test_a_config_with_comments_gets_the_hint_once(tmp_path, monkeypatch, capsys):
    plugin, config = _old_install(tmp_path)
    commented = '{ // mine\n  "plugin": ["' + ENTRY + '"]\n}'
    config.write_text(commented, encoding="utf-8")
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS
    assert config.read_text(encoding="utf-8") == commented
    out, err = capsys.readouterr()
    assert out == ""
    assert "graphify: refreshed" in err
    assert f'remove "{ENTRY}" from its plugin list by hand' in err

    mainmod._refresh_v1_opencode_plugins()
    assert capsys.readouterr().err == "", "no reminder on every later run"


def test_a_current_plugin_is_untouched_and_silent(tmp_path, monkeypatch, capsys):
    plugin, config = _old_install(tmp_path, _OPENCODE_PLUGIN_JS, entry=False)
    before = config.read_text(encoding="utf-8")
    stamp = plugin.stat().st_mtime_ns
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.stat().st_mtime_ns == stamp
    assert config.read_text(encoding="utf-8") == before
    assert capsys.readouterr().err == ""


def test_a_plugin_graphify_did_not_write_is_left_alone(tmp_path, monkeypatch, capsys):
    mine = "// my own plugin\nexport const Mine = async () => ({});\n"
    plugin, config = _old_install(tmp_path, mine)
    before = config.read_text(encoding="utf-8")
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == mine
    assert config.read_text(encoding="utf-8") == before
    assert capsys.readouterr().err == ""


def test_no_plugin_means_nothing_is_created(tmp_path, monkeypatch, capsys):
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert not (tmp_path / ".opencode").exists()
    assert not (Path.home() / ".opencode").exists()
    assert capsys.readouterr().err == ""


@pytest.mark.parametrize("value", ["1", "true", "YES"])
def test_the_env_opt_out_disables_it(tmp_path, monkeypatch, capsys, value):
    plugin, _config = _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)
    monkeypatch.setenv("GRAPHIFY_NO_AUTO_REFRESH", value)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == V1_PLUGIN
    assert capsys.readouterr().err == ""


def test_a_failed_rewrite_never_breaks_the_command(tmp_path, monkeypatch, capsys):
    plugin, _config = _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)

    def boom(_directory):
        raise PermissionError("read-only checkout")

    monkeypatch.setattr(mainmod, "_install_opencode_plugin", boom)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == V1_PLUGIN
    err = capsys.readouterr().err
    assert f"graphify: could not refresh {plugin.resolve()}: read-only checkout" in err
    assert "graphify: refreshed" not in err


def test_an_interrupted_rewrite_leaves_the_old_plugin_whole(tmp_path, monkeypatch, capsys):
    """OpenCode watches the plugin file, so it must go from the old content to
    the new one in a single rename, never through a half-written file."""
    import graphify.paths as pathsmod

    plugin, _config = _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)

    def killed(_tmp, _dst):
        raise OSError("disk full")

    monkeypatch.setattr(pathsmod, "os_replace_with_fallback", killed)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == V1_PLUGIN
    assert [p.name for p in plugin.parent.iterdir()] == ["graphify.js"], "no temp file left behind"
    assert "graphify: could not refresh" in capsys.readouterr().err


def test_a_symlinked_plugin_is_rewritten_through_the_link(tmp_path, monkeypatch, requires_symlinks):
    shared = tmp_path / "dotfiles" / "graphify.js"
    shared.parent.mkdir()
    shared.write_text(V1_PLUGIN, encoding="utf-8")
    project = tmp_path / "project"
    plugin = project / ".opencode" / "plugins" / "graphify.js"
    plugin.parent.mkdir(parents=True)
    plugin.symlink_to(shared)
    monkeypatch.chdir(project)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.is_symlink()
    assert shared.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS


def test_an_opencode_too_old_for_the_new_plugin_keeps_its_plugin(tmp_path, monkeypatch, capsys):
    """OpenCode 1 before 1.3.4 calls every export as a function. The plugin it
    has works there and the new one would not, so the refresh leaves it."""
    plugin, config = _old_install(tmp_path)
    before = config.read_text(encoding="utf-8")
    monkeypatch.chdir(tmp_path)
    monkeypatch.setattr(mainmod, "_opencode_loads_current_plugin", lambda: False)

    mainmod._refresh_v1_opencode_plugins()

    assert plugin.read_text(encoding="utf-8") == V1_PLUGIN
    assert config.read_text(encoding="utf-8") == before
    assert capsys.readouterr().err == ""


@pytest.mark.parametrize("output, loads", [
    ("1.3.3\n", False),
    ("1.3.4\n", True),
    ("1.18.34\n", True),
    ("opencode v2.0.22\n", True),
    ("0.15.31\n", False),
    ("", False),
    ("command not understood\n", False),
])
def test_the_installed_opencode_version_decides(monkeypatch, output, loads):
    calls = []

    def run(argv, **kwargs):
        calls.append((argv, kwargs.get("timeout")))
        return subprocess.CompletedProcess(argv, 0, stdout=output, stderr="")

    monkeypatch.setattr(mainmod.shutil, "which", lambda name: f"/opt/bin/{name}")
    monkeypatch.setattr(mainmod.subprocess, "run", run)

    assert _real_version_check() is loads
    assert calls == [(["/opt/bin/opencode", "--version"], 10)]


@pytest.mark.parametrize("failure", [OSError("gone"), subprocess.TimeoutExpired("opencode", 10)])
def test_an_opencode_that_cannot_be_asked_counts_as_too_old(monkeypatch, failure):
    def run(*_a, **_k):
        raise failure

    monkeypatch.setattr(mainmod.shutil, "which", lambda name: f"/opt/bin/{name}")
    monkeypatch.setattr(mainmod.subprocess, "run", run)
    assert _real_version_check() is False

    monkeypatch.setattr(mainmod.shutil, "which", lambda name: None)
    assert _real_version_check() is False


def test_opencode_is_only_asked_when_an_old_plugin_is_found(tmp_path, monkeypatch, capsys):
    def asked():
        raise AssertionError("no old plugin here, the version does not matter")

    monkeypatch.setattr(mainmod, "_opencode_loads_current_plugin", asked)
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()  # no plugin at all
    _plugin, config = _old_install(tmp_path, _OPENCODE_PLUGIN_JS)
    mainmod._refresh_v1_opencode_plugins()  # current plugin, stale entry

    assert json.loads(config.read_text(encoding="utf-8")) == {"model": "some/model"}
    assert "removed the stale graphify entry" in capsys.readouterr().err


@pytest.mark.parametrize("held", [False, None])
def test_a_directory_another_process_is_refreshing_is_skipped(tmp_path, monkeypatch, capsys, held):
    """Same rule as the skill refresh: without the lock (another graphify
    process has it, or locking is unavailable) leave the directory alone."""
    plugin, config = _old_install(tmp_path)
    before = config.read_text(encoding="utf-8")
    monkeypatch.chdir(tmp_path)
    locked = []

    @contextlib.contextmanager
    def lock(directory, *, wait):
        locked.append((directory, wait))
        yield held

    monkeypatch.setattr(mainmod, "_skill_lock", lock)

    mainmod._refresh_v1_opencode_plugins()

    assert locked == [(plugin.resolve().parent, False)]
    assert plugin.read_text(encoding="utf-8") == V1_PLUGIN
    assert config.read_text(encoding="utf-8") == before
    assert capsys.readouterr().err == ""


def test_no_lock_file_is_made_where_there_is_nothing_to_refresh(tmp_path, monkeypatch):
    _old_install(tmp_path, _OPENCODE_PLUGIN_JS, entry=False)
    monkeypatch.chdir(tmp_path)

    mainmod._refresh_v1_opencode_plugins()

    assert not (Path.home() / ".cache" / "graphify").exists()


def test_the_first_cli_run_after_an_upgrade_rewrites_it(tmp_path, monkeypatch, capsys):
    plugin, _config = _old_install(tmp_path)
    monkeypatch.chdir(tmp_path)
    monkeypatch.setattr(sys, "argv", ["graphify", "--version"])

    mainmod._run_cli()

    out, err = capsys.readouterr()
    assert out.strip() == f"graphify {__version__}"
    assert plugin.read_text(encoding="utf-8") == _OPENCODE_PLUGIN_JS
    assert "graphify: refreshed" in err


@pytest.mark.parametrize("cmd", ["install", "uninstall", "hook-check", "hook-guard"])
def test_install_and_hook_commands_skip_it(monkeypatch, cmd):
    calls = []
    monkeypatch.setattr(mainmod, "_refresh_v1_opencode_plugins", lambda: calls.append(cmd))
    monkeypatch.setattr(mainmod, "_refresh_stale_skills", lambda: None)
    monkeypatch.setattr(mainmod, "_check_skill_version", lambda *_a, **_k: None)
    monkeypatch.setattr(sys, "argv", ["graphify", cmd, "--help"])

    class _Stop(Exception):
        pass

    def stop(*_a, **_k):
        raise _Stop

    monkeypatch.setattr(mainmod, "dispatch_install_cli", stop)
    monkeypatch.setattr(mainmod, "dispatch_command", stop)
    try:
        mainmod._run_cli()
    except (_Stop, SystemExit):
        pass
    assert calls == []