#!/usr/bin/env python3
"""Tests for the graph-in-memory contract of the stdio server and the hook.

`index/graph.json` is no longer a committed artifact: the MCP server builds
the graph lazily from Markdown, invalidates it on writes, and `refresh_graph`
rebuilds (and optionally validates) in memory. The pre-commit hook only
validates. These tests pin that nothing in the default flow writes the file.
"""

from __future__ import annotations

import importlib
import json
import os
import subprocess
import sys
import tempfile
import unittest
from pathlib import Path

FRAMEWORK = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(FRAMEWORK / "scripts"))
mcp = importlib.import_module("mcp-server")


def write_note(root: Path, rel: str, note_id: str, body: str = "") -> None:
    path = root / rel
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(f"---\nid: {note_id}\ntitle: {note_id}\ntype: note\n---\n# {note_id}\n{body}\n", encoding="utf-8")


class InMemoryVault(unittest.TestCase):
    def setUp(self) -> None:
        self._tmp = tempfile.TemporaryDirectory()
        self.root = Path(self._tmp.name).resolve() / "vault"
        self.root.mkdir()
        write_note(self.root, "03_resources/a.md", "a", "[b](b)")
        write_note(self.root, "03_resources/b.md", "b")
        self.state = mcp.AppState(root=self.root)

    def tearDown(self) -> None:
        self._tmp.cleanup()

    def call(self, name: str, **args) -> dict:
        return mcp._call_tool(self.state, name, args)


class TestStdioServerBuildsGraphLazily(InMemoryVault):
    def test_summary_without_graph_file(self) -> None:
        payload = self.call("graph_summary")["structuredContent"]
        self.assertEqual(payload["node_count"], 2)
        self.assertEqual(payload["edge_count"], 1)
        self.assertFalse((self.root / "index").exists())

    def test_write_note_invalidates_cache(self) -> None:
        self.call("graph_summary")
        self.call("write_note", path="03_resources/c.md", content="---\nid: c\n---\n# c\n")
        self.assertEqual(self.call("graph_summary")["structuredContent"]["node_count"], 3)

    def test_edit_note_invalidates_cache(self) -> None:
        self.call("graph_summary")
        self.call("edit_note", path="03_resources/b.md", old_string="# b", new_string="# b\n[a](a)")
        self.assertEqual(self.call("graph_summary")["structuredContent"]["edge_count"], 2)

    def test_refresh_rebuilds_and_validates_in_memory(self) -> None:
        self.call("graph_summary")
        write_note(self.root, "03_resources/d.md", "d", "[gone](nowhere)")
        ok = self.call("refresh_graph")
        self.assertFalse(ok.get("isError"), ok)
        self.assertEqual(ok["structuredContent"]["node_count"], 3)
        bad = self.call("refresh_graph", validate=True)
        self.assertTrue(bad.get("isError"), bad)
        self.assertIn("nowhere", json.dumps(bad["structuredContent"]))
        self.assertFalse((self.root / "index").exists())

    def test_graph_resource_is_served_from_memory(self) -> None:
        result = mcp._read_resource(self.state, "repo://graph")
        graph = json.loads(result["contents"][0]["text"])
        self.assertEqual(len(graph["nodes"]), 2)
        self.assertFalse((self.root / "index").exists())

    def test_read_note_by_id_uses_in_memory_graph(self) -> None:
        payload = self.call("read_note", id="b")["structuredContent"]
        self.assertEqual(payload["path"], "03_resources/b.md")


class TestGeneratorAndHookValidateOnly(unittest.TestCase):
    def setUp(self) -> None:
        self._tmp = tempfile.TemporaryDirectory()
        self.root = Path(self._tmp.name).resolve() / "vault"
        self.root.mkdir()
        write_note(self.root, "03_resources/a.md", "a")
        self.env = {k: v for k, v in os.environ.items() if k != "KNOWLEDGE_BASE_ROOT"}

    def tearDown(self) -> None:
        self._tmp.cleanup()

    def run_cmd(self, *cmd: str) -> subprocess.CompletedProcess:
        return subprocess.run(list(cmd), cwd=self.root, env=self.env, capture_output=True, text=True)

    def test_validate_alone_writes_nothing(self) -> None:
        proc = self.run_cmd(sys.executable, str(FRAMEWORK / "scripts/generate-graph.py"), "--vault-root", str(self.root), "--validate")
        self.assertEqual(proc.returncode, 0, proc.stdout + proc.stderr)
        self.assertFalse((self.root / "index").exists())

    def test_write_still_produces_a_file_for_operators(self) -> None:
        proc = self.run_cmd(sys.executable, str(FRAMEWORK / "scripts/generate-graph.py"), "--vault-root", str(self.root), "--write")
        self.assertEqual(proc.returncode, 0, proc.stdout + proc.stderr)
        self.assertTrue((self.root / "index/graph.json").exists())

    def test_hook_validates_without_requiring_a_staged_graph(self) -> None:
        hook = FRAMEWORK / "scripts/pre-commit"
        proc = self.run_cmd("bash", str(hook), str(self.root))
        self.assertEqual(proc.returncode, 0, proc.stdout + proc.stderr)
        self.assertFalse((self.root / "index").exists())
        write_note(self.root, "03_resources/b.md", "b", "[x](missing)")
        proc = self.run_cmd("bash", str(hook), str(self.root))
        self.assertNotEqual(proc.returncode, 0)
        self.assertIn("missing", proc.stdout + proc.stderr)
        self.assertFalse((self.root / "index").exists())


if __name__ == "__main__":
    unittest.main()