from __future__ import annotations

import os
from pathlib import Path

import pytest

from tenbackward.config import ConfigError, load_config, validate_config


def _populate(env_setup) -> dict[str, str]:
    return {k: os.environ[k] for k in os.environ if k.startswith(("MASTODON_", "VISIBILITY", "SITE_", "HASHTAGS", "THROWNBACK_", "MAX_RETRIES", "RUN_AT", "TZ"))}


def _full_values() -> dict[str, str]:
    return {
        "MASTODON_BASE_URL": "https://mastodon.example",
        "MASTODON_ACCESS_TOKEN": "x",
        "VISIBILITY": "public",
        "SITE_URL": "https://blog.example.com",
        "HASHTAGS": "#throwback",
        "THROWNBACK_PREFIX": "Throwback:",
        "MAX_RETRIES": "3",
        "RUN_AT": "09:00",
        "TZ": "Europe/Berlin",
    }


def test_load_config_succeeds_with_complete_env(env_setup) -> None:
    config = load_config()
    assert config.mastodon_base_url == "https://mastodon.example"
    assert config.run_at == "09:00"
    assert config.max_retries == 3
    assert config.throwback_prefix == "Throwback:"
    assert config.visibility == "public"


def test_load_config_blog_defaults(env_setup) -> None:
    config = load_config()
    assert config.blog_repo_url == "https://git.chaospott.de/Chaospott/site"
    assert config.blog_dir.name == "blog"


def test_load_config_blog_repo_url_override(env_setup, monkeypatch) -> None:
    monkeypatch.setenv("BLOG_REPO_URL", "https://example.com/repo.git")
    config = load_config()
    assert config.blog_repo_url == "https://example.com/repo.git"


def test_validate_config_rejects_bad_blog_repo_url(env_setup) -> None:
    values = {
        "MASTODON_BASE_URL": "https://mastodon.example",
        "MASTODON_ACCESS_TOKEN": "x",
        "VISIBILITY": "public",
        "SITE_URL": "https://blog.example.com",
        "HASHTAGS": "#throwback",
        "THROWNBACK_PREFIX": "Throwback:",
        "MAX_RETRIES": "3",
        "RUN_AT": "09:00",
        "TZ": "Europe/Berlin",
        "BLOG_REPO_URL": "ftp://bad",
    }
    with pytest.raises(ConfigError, match="BLOG_REPO_URL"):
        validate_config(values)


def test_validate_config_lists_every_missing_key(env_setup, monkeypatch) -> None:
    monkeypatch.delenv("MASTODON_ACCESS_TOKEN")
    monkeypatch.delenv("SITE_URL")

    values = {k: os.environ.get(k, "") for k in [
        "MASTODON_BASE_URL",
        "MASTODON_ACCESS_TOKEN",
        "VISIBILITY",
        "SITE_URL",
        "HASHTAGS",
        "THROWNBACK_PREFIX",
        "MAX_RETRIES",
        "RUN_AT",
        "TZ",
    ]}

    with pytest.raises(ConfigError) as excinfo:
        validate_config(values)

    message = str(excinfo.value)
    assert "MASTODON_ACCESS_TOKEN" in message
    assert "SITE_URL" in message


def test_validate_config_rejects_bad_run_at() -> None:
    values = _full_values()
    values["RUN_AT"] = "25:99"
    with pytest.raises(ConfigError):
        validate_config(values)


def test_validate_config_rejects_invalid_url() -> None:
    values = _full_values()
    values["SITE_URL"] = "not-a-url"
    with pytest.raises(ConfigError, match="SITE_URL"):
        validate_config(values)

    values = _full_values()
    values["MASTODON_BASE_URL"] = "ftp://mastodon.example"
    with pytest.raises(ConfigError, match="MASTODON_BASE_URL"):
        validate_config(values)


def test_validate_config_rejects_invalid_visibility() -> None:
    for bad in ("private", "direct", "", "PUBLIC"):
        values = _full_values()
        values["VISIBILITY"] = bad
        with pytest.raises(ConfigError, match="VISIBILITY"):
            validate_config(values)


def test_validate_config_rejects_invalid_tz() -> None:
    values = _full_values()
    values["TZ"] = "Not/AZone"
    with pytest.raises(ConfigError, match="TZ"):
        validate_config(values)


def test_validate_config_rejects_negative_max_retries() -> None:
    values = _full_values()
    values["MAX_RETRIES"] = "-1"
    with pytest.raises(ConfigError, match="MAX_RETRIES"):
        validate_config(values)


def test_validate_config_accepts_zero_max_retries() -> None:
    values = _full_values()
    values["MAX_RETRIES"] = "0"
    validate_config(values)


def test_load_config_applies_optional_defaults(env_setup, monkeypatch) -> None:
    monkeypatch.delenv("VISIBILITY", raising=False)
    monkeypatch.delenv("THROWNBACK_PREFIX", raising=False)
    monkeypatch.delenv("MAX_RETRIES", raising=False)
    monkeypatch.delenv("TZ", raising=False)

    config = load_config()
    assert config.throwback_prefix == "Throwback:"
    assert config.max_retries == 3
    assert config.tz == "Europe/Berlin"
    assert config.visibility == "public"


def test_load_config_reads_dotenv_file(tmp_path: Path, monkeypatch) -> None:
    dotenv = tmp_path / ".env"
    dotenv.write_text(
        "MASTODON_BASE_URL=https://from-file.example\n"
        "MASTODON_ACCESS_TOKEN=file-token\n"
        "VISIBILITY=unlisted\n"
        "SITE_URL=https://blog.example.com\n"
        "HASHTAGS=#throwback\n"
        "THROWNBACK_PREFIX=Werferückblick:\n"
        "MAX_RETRIES=5\n"
        "RUN_AT=12:34\n"
        "TZ=Europe/Berlin\n"
    )

    for key in (
        "MASTODON_BASE_URL",
        "MASTODON_ACCESS_TOKEN",
        "VISIBILITY",
        "SITE_URL",
        "HASHTAGS",
        "THROWNBACK_PREFIX",
        "MAX_RETRIES",
        "RUN_AT",
        "TZ",
    ):
        monkeypatch.delenv(key, raising=False)

    config = load_config(dotenv_path=dotenv)
    assert config.mastodon_base_url == "https://from-file.example"
    assert config.mastodon_access_token == "file-token"
    assert config.run_at == "12:34"
    assert config.visibility == "unlisted"
    assert config.throwback_prefix == "Werferückblick:"
    assert config.max_retries == 5


def test_env_overrides_dotenv(tmp_path: Path, monkeypatch) -> None:
    dotenv = tmp_path / ".env"
    dotenv.write_text("RUN_AT=01:00\n")

    monkeypatch.setenv("RUN_AT", "23:00")
    for key in (
        "MASTODON_BASE_URL",
        "MASTODON_ACCESS_TOKEN",
        "VISIBILITY",
        "SITE_URL",
        "HASHTAGS",
        "THROWNBACK_PREFIX",
        "MAX_RETRIES",
        "TZ",
    ):
        monkeypatch.setenv(key, "x")
    monkeypatch.setenv("MASTODON_BASE_URL", "https://mastodon.example")
    monkeypatch.setenv("SITE_URL", "https://blog.example.com")
    monkeypatch.setenv("VISIBILITY", "public")
    monkeypatch.setenv("TZ", "Europe/Berlin")
    monkeypatch.setenv("MAX_RETRIES", "3")

    config = load_config(dotenv_path=dotenv)
    assert config.run_at == "23:00"