import pytest

from app import create_app
from app.config import (
    DEVELOPMENT_SECRET_KEY,
    _get_max_content_length,
    _get_secret_key,
    validate_secret_key,
)


def test_max_upload_size_mb_environment_variable(monkeypatch):
    monkeypatch.setenv("MAX_UPLOAD_SIZE_MB", "42")
    monkeypatch.delenv("MAX_CONTENT_LENGTH", raising=False)

    assert _get_max_content_length() == 42 * 1024 * 1024


def test_max_content_length_environment_variable_is_supported(monkeypatch):
    monkeypatch.delenv("MAX_UPLOAD_SIZE_MB", raising=False)
    monkeypatch.setenv("MAX_CONTENT_LENGTH", "2048")

    assert _get_max_content_length() == 2048


def test_secret_key_uses_development_fallback(monkeypatch):
    monkeypatch.setenv("APP_ENV", "development")
    monkeypatch.delenv("FLASK_ENV", raising=False)
    monkeypatch.delenv("SECRET_KEY", raising=False)

    assert _get_secret_key() == DEVELOPMENT_SECRET_KEY


def test_secret_key_is_required_outside_development(monkeypatch):
    monkeypatch.setenv("APP_ENV", "production")
    monkeypatch.delenv("FLASK_ENV", raising=False)
    monkeypatch.delenv("SECRET_KEY", raising=False)

    assert _get_secret_key() == ""


def test_validate_secret_key_rejects_unsafe_value_outside_development(monkeypatch):
    monkeypatch.setenv("APP_ENV", "production")
    monkeypatch.delenv("FLASK_ENV", raising=False)

    with pytest.raises(RuntimeError, match="SECRET_KEY is missing or unsafe"):
        validate_secret_key("change-me")


def test_create_app_allows_development_without_explicit_secret_key(tmp_path, monkeypatch):
    monkeypatch.setenv("APP_ENV", "development")
    monkeypatch.delenv("FLASK_ENV", raising=False)
    monkeypatch.delenv("SECRET_KEY", raising=False)

    class DevelopmentConfig:
        SECRET_KEY = DEVELOPMENT_SECRET_KEY
        MAX_CONTENT_LENGTH = 1024
        PREVIEW_RECORD_LIMIT = 5
        OUTPUT_DIRECTORY = tmp_path / "dev-outputs"
        OUTPUT_RETENTION_HOURS = 24
        CLEANUP_ON_STARTUP = False
        CLEANUP_AFTER_DOWNLOAD = False

    app = create_app(DevelopmentConfig)

    assert app.config["SECRET_KEY"] == DEVELOPMENT_SECRET_KEY


def test_create_app_rejects_unsafe_secret_key_outside_development(tmp_path, monkeypatch):
    monkeypatch.setenv("APP_ENV", "production")
    monkeypatch.delenv("FLASK_ENV", raising=False)

    class ProductionConfig:
        SECRET_KEY = "change-me"
        MAX_CONTENT_LENGTH = 1024
        PREVIEW_RECORD_LIMIT = 5
        OUTPUT_DIRECTORY = tmp_path / "prod-outputs"
        OUTPUT_RETENTION_HOURS = 24
        CLEANUP_ON_STARTUP = False
        CLEANUP_AFTER_DOWNLOAD = False

    with pytest.raises(RuntimeError, match="SECRET_KEY is missing or unsafe"):
        create_app(ProductionConfig)


def test_create_app_rejects_missing_secret_key_outside_development(tmp_path, monkeypatch):
    monkeypatch.setenv("APP_ENV", "production")
    monkeypatch.delenv("FLASK_ENV", raising=False)

    class ProductionConfig:
        SECRET_KEY = ""
        MAX_CONTENT_LENGTH = 1024
        PREVIEW_RECORD_LIMIT = 5
        OUTPUT_DIRECTORY = tmp_path / "prod-outputs-missing-key"
        OUTPUT_RETENTION_HOURS = 24
        CLEANUP_ON_STARTUP = False
        CLEANUP_AFTER_DOWNLOAD = False

    with pytest.raises(RuntimeError, match="SECRET_KEY is missing or unsafe"):
        create_app(ProductionConfig)