"""Unit tests for the intellisense symbol scanner and its library-cache
resolution helpers. Pure-Python — no FastAPI app, no HTTP server, no
toolchain — so they run anywhere pytest does.
"""
from __future__ import annotations

from pathlib import Path

import pytest

from app.services.symbol_extract import (
    find_cache_entry,
    norm_name,
    norm_version,
    parse_spec,
    scan_library,
)


# ── fixture library ───────────────────────────────────────────────────────

_HEADER = """\
#pragma once
#include <stdint.h>

#define FAKE_MAX_PIXELS 64
#define FAKE_NAME "fake"  // string-valued define still counts
#define FAKE_FUNC(x) ((x) * 2)
#define lowercase_define 1
#define FAKE_GUARD_H

enum FakeMode { FAKE_MODE_A, FAKE_MODE_B = 2 };
enum class FakeColor : uint8_t { Red, Green };

/* block comment with a fake decl: void notReal(); */
class FakeLib {
public:
    FakeLib(uint8_t pin);
    ~FakeLib();
    bool begin(uint8_t pin, int count = 8);
    void show();
private:
    void internalUpdate();
    uint8_t pin_;
};
"""


@pytest.fixture
def fake_lib(tmp_path: Path) -> Path:
    lib = tmp_path / "fakelib@1.2.3-0123456789ab"
    src = lib / "src"
    src.mkdir(parents=True)
    (lib / "library.properties").write_text(
        "name=Fake Lib\nversion=1.2.3\n", encoding="utf-8"
    )
    (src / "FakeLib.h").write_text(_HEADER, encoding="utf-8")
    examples = lib / "examples"
    examples.mkdir()
    (examples / "Noise.h").write_text(
        "class NotMe { public: void nope(); };\n", encoding="utf-8"
    )
    return lib


def _by_kind(result: dict, kind: str) -> dict[str, dict]:
    return {s["name"]: s for s in result["symbols"] if s["kind"] == kind}


# ── scan_library ──────────────────────────────────────────────────────────

def test_scan_library_id_and_triggers(fake_lib: Path) -> None:
    result = scan_library(fake_lib)
    assert result["id"] == "Fake Lib"
    assert "FakeLib.h" in result["triggers"]
    # examples/ headers are neither triggers nor scanned for symbols
    assert "Noise.h" not in result["triggers"]
    assert all(s["name"] != "NotMe" for s in result["symbols"])


def test_scan_library_class_and_public_methods(fake_lib: Path) -> None:
    result = scan_library(fake_lib)
    classes = _by_kind(result, "class")
    methods = _by_kind(result, "method")

    assert "FakeLib" in classes
    # constructor is folded into the class symbol, not a separate method
    assert classes["FakeLib"]["insertText"] == "FakeLib(${1:pin})$0"
    assert classes["FakeLib"]["params"] == ["uint8_t pin"]

    assert set(methods) == {"begin", "show"}
    for m in methods.values():
        assert m["owner"] == "FakeLib"
        assert m["detail"] == "Fake Lib"
    assert methods["begin"]["signature"] == "bool begin(uint8_t pin, int count = 8)"
    # only the required (non-defaulted) arg becomes a snippet placeholder
    assert methods["begin"]["insertText"] == "begin(${1:pin})$0"
    assert methods["begin"]["params"] == ["uint8_t pin", "int count = 8"]
    assert methods["show"]["insertText"] == "show()"

    # private method and destructor never surface
    assert "internalUpdate" not in methods
    assert all("~" not in s["name"] for s in result["symbols"])


def test_scan_library_constants_and_enums(fake_lib: Path) -> None:
    result = scan_library(fake_lib)
    constants = _by_kind(result, "constant")

    assert "FAKE_MAX_PIXELS" in constants
    assert "FAKE_NAME" in constants
    # function-like macro, lowercase define, and value-less include guard: out
    assert "FAKE_FUNC" not in constants
    assert "lowercase_define" not in constants
    assert "FAKE_GUARD_H" not in constants

    # plain enum values: no owner; enum class values: owner set
    assert "FAKE_MODE_A" in constants and "owner" not in constants["FAKE_MODE_A"]
    assert "FAKE_MODE_B" in constants
    assert constants["Red"]["owner"] == "FakeColor"
    assert constants["Green"]["owner"] == "FakeColor"


# ── spec parsing / normalization (used by the route) ──────────────────────

def test_parse_spec() -> None:
    assert parse_spec("Adafruit GFX Library@1.12.6") == ("Adafruit GFX Library", "1.12.6")
    assert parse_spec("FastLED") == ("FastLED", None)
    assert parse_spec("") == ("", None)


def test_norm_rules_mirror_library_cache() -> None:
    assert norm_name("Adafruit GFX Library") == "adafruitgfxlibrary"
    assert norm_name("DHT sensor library") == "dhtsensorlibrary"
    assert norm_name("") == ""
    assert norm_version("1.12.6") == "1.12.6"
    assert norm_version(" 1.2.3 ") == "1.2.3"
    # unsafe chars become '-', leading dots are stripped (no '.'/'..' tokens)
    assert norm_version("../evil/1") == "-evil-1"
    assert norm_version("") == "0"


def test_find_cache_entry(tmp_path: Path) -> None:
    for entry in (
        "fastled@3.6.0-aaaaaaaaaaaa",
        "fastled@3.10.1-bbbbbbbbbbbb",
        "other@1.0.0-cccccccccccc",
        ".symbols",
    ):
        (tmp_path / entry).mkdir()

    exact = find_cache_entry(tmp_path, "FastLED", "3.6.0")
    assert exact is not None and exact.name == "fastled@3.6.0-aaaaaaaaaaaa"

    # bare name -> NEWEST version, compared numerically (3.10.1 > 3.6.0 even
    # though it sorts first lexicographically) — mirrors lookup_by_name
    bare = find_cache_entry(tmp_path, "FastLED")
    assert bare is not None and bare.name == "fastled@3.10.1-bbbbbbbbbbbb"

    assert find_cache_entry(tmp_path, "FastLED", "9.9.9") is None
    assert find_cache_entry(tmp_path, "Nope") is None
    assert find_cache_entry(tmp_path / "missing", "FastLED") is None
    assert find_cache_entry(tmp_path, "!!!") is None  # normalizes to empty


# ── route wiring (skipped where fastapi is not installed) ─────────────────

def test_route_registers_symbols_path() -> None:
    pytest.importorskip("fastapi")
    from app.api.routes import intellisense

    assert any(r.path == "/symbols/{spec}" for r in intellisense.router.routes)