"""Tests for esphome.espidf.idedata (compile_commands.json -> idedata)."""

# pylint: disable=protected-access

import json
import os
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest

from esphome.espidf import idedata

# An absolute, forward-slash (shlex-safe) path prefix valid on the host OS, so
# tests exercise the same is-absolute / normalize behavior as a real compile DB
# (a drive-qualified path on Windows, a leading slash elsewhere).
ABS = "C:/" if os.name == "nt" else "/"


def _entry(directory: str, file: str, command: str) -> dict:
    return {"directory": directory, "file": file, "command": command}


def test_parse_entry_extracts_fields() -> None:
    """cxx_path, defines, includes and remaining flags are split apart."""
    entry = _entry(
        f"{ABS}build",
        f"{ABS}build/src/esphome/core/application.cpp",
        f"/tools/xtensa-esp32-elf-g++ -DUSE_ESP32 -DESPHOME_LOG_LEVEL=5 "
        f"-I{ABS}inc/a -isystem {ABS}sys/b -std=gnu++20 -c app.cpp -o app.cpp.o",
    )

    cxx_path, defines, includes, cxx_flags = idedata._parse_entry(entry)

    assert cxx_path == "/tools/xtensa-esp32-elf-g++"
    assert "USE_ESP32" in defines
    assert "ESPHOME_LOG_LEVEL=5" in defines
    assert f"{ABS}inc/a" in includes
    assert f"{ABS}sys/b" in includes
    assert "-std=gnu++20" in cxx_flags
    # input/output files and their flags are not treated as flags
    assert "-c" not in cxx_flags
    assert "-o" not in cxx_flags
    assert "app.cpp" not in cxx_flags
    assert "app.cpp.o" not in cxx_flags


def test_parse_entry_space_separated_args() -> None:
    """``-D X`` / ``-I path`` (separate arg) and ``-isystem<path>`` (joined)."""
    entry = _entry(
        f"{ABS}build",
        f"{ABS}build/src/esphome/x.cpp",
        f"g++ -D FOO=1 -I {ABS}inc/sep -isystem{ABS}sys/joined -c x.cpp",
    )

    _, defines, includes, _ = idedata._parse_entry(entry)

    assert "FOO=1" in defines
    assert f"{ABS}inc/sep" in includes
    assert f"{ABS}sys/joined" in includes


def test_parse_entry_resolves_relative_includes() -> None:
    """Relative includes are resolved against the entry's ``directory``."""
    directory = f"{ABS}build/proj"
    entry = _entry(
        directory,
        f"{directory}/src/esphome/x.cpp",
        "g++ -Iconfig -I../shared -isystem rel/sys -c x.cpp",
    )

    _, _, includes, _ = idedata._parse_entry(entry)

    def resolved(rel: str) -> str:
        return os.path.normpath(Path(directory) / rel)

    assert resolved("config") in includes
    assert resolved("../shared") in includes  # ../ normalized away
    assert resolved("rel/sys") in includes
    # nothing is left relative
    assert all(Path(inc).is_absolute() for inc in includes)


def test_parse_entry_skips_dependency_flags() -> None:
    """Dependency-generation flags (and their args) are dropped."""
    entry = _entry(
        "/build",
        "/build/src/esphome/x.cpp",
        "g++ -MD -MT x.cpp.o -MF x.cpp.o.d -c x.cpp -o x.cpp.o",
    )

    _, _, _, cxx_flags = idedata._parse_entry(entry)

    for tok in ("-MD", "-MT", "x.cpp.o", "-MF", "x.cpp.o.d", "-c", "-o", "x.cpp"):
        assert tok not in cxx_flags


def test_expand_response_files(tmp_path: Path) -> None:
    """``@file`` arguments are inlined relative to the directory."""
    rsp = tmp_path / "flags.rsp"
    rsp.write_text("-DFROM_RSP -I/rsp/inc")

    tokens = idedata._expand_response_files(
        ["g++", f"@{rsp.name}", "-c", "x.cpp"], tmp_path
    )

    assert "-DFROM_RSP" in tokens
    assert "-I/rsp/inc" in tokens
    assert not any(t.startswith("@") for t in tokens)


def test_expand_response_files_keeps_literal_when_missing(tmp_path: Path) -> None:
    """An unreadable ``@file`` token is kept verbatim rather than dropped."""
    tokens = idedata._expand_response_files(["g++", "@nope.rsp"], tmp_path)
    assert "@nope.rsp" in tokens


def test_pick_entry_prefers_esphome_tu() -> None:
    """A ``/src/esphome/`` C++ TU is picked over other compile entries."""
    entries = [
        _entry("/b", "/b/managed_components/foo/foo.c", "gcc -c foo.c"),
        _entry("/b", "/b/src/esphome/core/app.cpp", "g++ -c app.cpp"),
    ]
    assert idedata._pick_entry(entries)["file"].endswith("app.cpp")


def test_idedata_from_build(tmp_path: Path) -> None:
    """Full transform: representative entry + include union + toolchain dirs."""
    compile_commands = tmp_path / "compile_commands.json"
    entries = [
        _entry(
            f"{ABS}b",
            f"{ABS}b/src/esphome/core/app.cpp",
            f"g++ -DUSE_ESP32 -I{ABS}inc/core -std=gnu++20 -c app.cpp -o app.cpp.o",
        ),
        _entry(
            f"{ABS}b",
            f"{ABS}b/src/esphome/sensor/s.cpp",
            f"g++ -DUSE_ESP32 -I{ABS}inc/sensor -c s.cpp -o s.cpp.o",
        ),
        # non-esphome TU: its includes must not leak into the union
        _entry(
            f"{ABS}b",
            f"{ABS}b/managed_components/x/x.c",
            f"gcc -I{ABS}inc/managed -c x.c",
        ),
    ]
    compile_commands.write_text(json.dumps(entries))

    fake_proc = MagicMock(
        returncode=0,
        stderr=(
            "ignored\n"
            "#include <...> search starts here:\n"
            " /tc/inc/c++\n"
            " /tc/inc\n"
            "End of search list.\n"
            "more ignored\n"
        ),
    )
    with patch.object(idedata.subprocess, "run", return_value=fake_proc):
        data = idedata.idedata_from_build(compile_commands)

    assert data["cxx_path"] == "g++"
    assert "USE_ESP32" in data["defines"]
    assert "-std=gnu++20" in data["cxx_flags"]
    # include dirs unioned across all esphome TUs
    assert f"{ABS}inc/core" in data["includes"]["build"]
    assert f"{ABS}inc/sensor" in data["includes"]["build"]
    # the non-esphome TU is excluded from the union
    assert f"{ABS}inc/managed" not in data["includes"]["build"]
    # toolchain search dirs parsed from the compiler's -v output
    assert data["includes"]["toolchain"] == ["/tc/inc/c++", "/tc/inc"]


def test_get_toolchain_includes_raises_on_probe_failure() -> None:
    """A failed compiler probe is a hard error, not a silent empty list."""
    fake_proc = MagicMock(returncode=1, stderr="xtensa-esp32-elf-g++: not found")
    with (
        patch.object(idedata.subprocess, "run", return_value=fake_proc),
        pytest.raises(RuntimeError, match="builtin include dirs"),
    ):
        idedata._get_toolchain_includes("/bad/compiler")


def test_get_toolchain_includes_raises_when_no_dirs_found() -> None:
    """Markers present but no dirs (anomalous output) also raises."""
    fake_proc = MagicMock(
        returncode=0,
        stderr="#include <...> search starts here:\nEnd of search list.\n",
    )
    with (
        patch.object(idedata.subprocess, "run", return_value=fake_proc),
        pytest.raises(RuntimeError, match="builtin include dirs"),
    ):
        idedata._get_toolchain_includes("/some/compiler")