"""Configuration from a dotenv file, including the archived CLI's variable names.

An operator who already has a ``photo_analyzer.env`` should not have to rewrite it
to run the application it was replaced by. The file is standing configuration; the
shell is what you meant this time, so the shell always wins.
"""

from __future__ import annotations

import os

from photo_pipeline.config import Config, load_env_file, parse_env_file

SAMPLE = """
# The archived CLI's shape, comments and all.
LLM_API_KEY=not-real
LLM_BASE_URL="https://example.invalid/v1beta/openai/"
LLM_MODEL='gemini-2.5-flash'
LIBRARY=/tmp/pictures

MAX_WORKERS=4
# commented=ignored
malformed line without an equals sign
"""


def test_the_file_is_parsed_and_never_executed():
    values = parse_env_file(SAMPLE)

    assert values["LLM_BASE_URL"] == "https://example.invalid/v1beta/openai/"  # quotes stripped
    assert values["LLM_MODEL"] == "gemini-2.5-flash"
    assert values["MAX_WORKERS"] == "4"
    assert "commented" not in values and "malformed line without an equals sign" not in values


def test_the_archived_cli_names_still_configure_the_application():
    values = parse_env_file(SAMPLE)

    assert values["OPENAI_API_KEY"] == "not-real"
    assert values["OPENAI_BASE_URL"] == "https://example.invalid/v1beta/openai/"
    assert values["PHOTO_PIPELINE_LIBRARY_ROOTS"] == "/tmp/pictures"


def test_an_explicit_shell_variable_beats_the_file(tmp_path, monkeypatch):
    path = tmp_path / "photo_analyzer.env"
    path.write_text(SAMPLE)
    monkeypatch.setenv("OPENAI_API_KEY", "from-the-shell")
    monkeypatch.delenv("PHOTO_PIPELINE_LIBRARY_ROOTS", raising=False)

    applied = load_env_file(path)

    assert "OPENAI_API_KEY" not in applied, "the file overrode an exported value"
    assert os.environ["OPENAI_API_KEY"] == "from-the-shell"
    assert os.environ["PHOTO_PIPELINE_LIBRARY_ROOTS"] == "/tmp/pictures"
    assert Config.from_env().library_roots[0].name == "pictures"


def test_the_file_is_found_through_its_variable(tmp_path, monkeypatch):
    path = tmp_path / "custom.env"
    path.write_text("PHOTO_PIPELINE_PORT=9123\n")
    monkeypatch.delenv("PHOTO_PIPELINE_PORT", raising=False)
    monkeypatch.setenv("PHOTO_PIPELINE_ENV_FILE", str(path))
    monkeypatch.chdir(tmp_path)  # no ./.env here, so only the variable can find it

    assert Config.from_env().port == 9123


def test_a_missing_file_is_not_an_error(tmp_path):
    assert load_env_file(tmp_path / "nothing-here.env") == {}