from __future__ import annotations

import os
from datetime import date
from pathlib import Path
from typing import Callable

import pytest

from tenbackward.config import load_config
from tenbackward.matching import MatchedPost
from tenbackward.publishing import (
    MASTODON_STATUS_LIMIT,
    PublishError,
    build_status_text,
    publish_mastodon,
    slugify_title,
    validate_status,
)
from tenbackward.state import PostedStore


def _make_match(path: str, title: str, day: int = 4) -> MatchedPost:
    return MatchedPost(
        path=path,
        title=title,
        date=date(2016, 8, day),
        url=f"https://blog.example.com/2016/08/{day:02d}/{path.split('-', 3)[-1].removesuffix('.md')}/",
    )


class _FakeMastodon:
    """Captures ``status_post`` calls and can be configured to raise."""

    def __init__(self, *, raise_on_post: Exception | None = None) -> None:
        self.raise_on_post = raise_on_post
        self.calls: list[tuple[str, dict]] = []

    def __call__(self, *, access_token: str, api_base_url: str) -> "_FakeMastodon":
        self.access_token = access_token
        self.api_base_url = api_base_url
        return self

    def status_post(self, status: str, **kwargs) -> None:
        self.calls.append((status, kwargs))
        if self.raise_on_post is not None:
            raise self.raise_on_post


@pytest.fixture()
def full_config(env_setup, tmp_path: Path):
    os.environ["DATA_DIR"] = str(tmp_path)
    return load_config()


def test_slugify_title_basic_ascii() -> None:
    assert slugify_title("Hello, World!") == "hello-world"


def test_slugify_title_collapses_repeats_and_trims() -> None:
    assert slugify_title("!!!Foo---Bar???") == "foo-bar"
    assert slugify_title("---trim---me---") == "trim-me"


def test_build_status_text_single_post_layout() -> None:
    match = _make_match("2016/2016-08-04-foo.md", "Foo")
    status = build_status_text(
        "Heute vor 10 Jahren:", [match], "#throwback,#10backward"
    )
    assert status == (
        "Heute vor 10 Jahren:\n\n"
        "Foo\nhttps://blog.example.com/2016/08/04/foo/\n\n"
        "#throwback #10backward\n"
    )


def test_build_status_text_multiple_posts_combined() -> None:
    match_a = _make_match("2016/2016-08-04-a.md", "Alpha")
    match_b = _make_match("2016/2016-08-04-b.md", "Bravo")
    status = build_status_text("P:", [match_a, match_b], "#x")
    assert "Alpha" in status
    assert "Bravo" in status
    assert match_a.url in status
    assert match_b.url in status
    assert status.count("Alpha") == 1
    assert status.count("Bravo") == 1
    assert status.count(match_a.url) == 1
    assert status.count(match_b.url) == 1


def test_build_status_text_empty_posts_raises() -> None:
    with pytest.raises(PublishError):
        build_status_text("P:", [], "#x")


def test_build_status_text_preserves_deterministic_order() -> None:
    match_a = _make_match("2016/2016-08-05-a.md", "Alpha", day=5)
    match_b = _make_match("2016/2016-08-04-b.md", "Bravo", day=4)
    forward = build_status_text("P:", [match_a, match_b], "#x")
    reverse = build_status_text("P:", [match_b, match_a], "#x")
    assert forward == reverse
    assert forward.index("Bravo") < forward.index("Alpha")


def test_validate_status_within_limit() -> None:
    validate_status("a" * 480)


def test_validate_status_over_limit_raises_and_does_not_truncate() -> None:
    long = "a" * (MASTODON_STATUS_LIMIT + 1)
    with pytest.raises(PublishError):
        validate_status(long)
    assert len(long) == MASTODON_STATUS_LIMIT + 1


def test_publish_mastodon_success_invokes_client_with_composed_status(
    full_config,
) -> None:
    match = _make_match("2016/2016-08-04-foo.md", "Foo")
    fake = _FakeMastodon()

    result = publish_mastodon(full_config, [match], client_factory=fake)

    assert result.endswith("\n")
    assert fake.calls, "status_post must be invoked"
    posted_status, posted_kwargs = fake.calls[0]
    assert posted_status == result
    assert posted_kwargs == {"visibility": "public"}
    assert fake.api_base_url == "https://mastodon.example"
    assert fake.access_token == "test-token"


def test_publish_mastodon_api_failure_raises_and_does_not_persist(
    full_config, tmp_path: Path
) -> None:
    match = _make_match("2016/2016-08-04-foo.md", "Foo")
    fake = _FakeMastodon(raise_on_post=RuntimeError("boom"))

    with pytest.raises(PublishError) as exc_info:
        publish_mastodon(full_config, [match], client_factory=fake)

    assert "publish_failed" in str(exc_info.value)
    assert isinstance(exc_info.value.__cause__, RuntimeError)

    store = PostedStore(tmp_path)
    assert not store.is_posted(match.path)


def test_publish_mastodon_over_limit_raises_before_api_call(
    full_config,
) -> None:
    long_title = "T" * (MASTODON_STATUS_LIMIT + 1)
    match = MatchedPost(
        path="2016/2016-08-04-foo.md",
        title=long_title,
        date=date(2016, 8, 4),
        url="https://blog.example.com/2016/08/04/foo/",
    )
    fake = _FakeMastodon()

    with pytest.raises(PublishError):
        publish_mastodon(full_config, [match], client_factory=fake)

    assert fake.calls == []


def test_publish_mastodon_combined_status_for_multiple_matches(full_config) -> None:
    match_a = _make_match("2016/2016-08-04-a.md", "Alpha")
    match_b = _make_match("2016/2016-08-04-b.md", "Bravo")
    fake = _FakeMastodon()

    publish_mastodon(full_config, [match_a, match_b], client_factory=fake)

    assert len(fake.calls) == 1
    status, _ = fake.calls[0]
    assert "Alpha" in status
    assert "Bravo" in status
    assert match_a.url in status
    assert match_b.url in status


def test_publish_mastodon_uses_config_visibility(env_setup, tmp_path: Path) -> None:
    os.environ["VISIBILITY"] = "unlisted"
    os.environ["DATA_DIR"] = str(tmp_path)
    config = load_config()
    match = _make_match("2016/2016-08-04-foo.md", "Foo")
    fake = _FakeMastodon()

    publish_mastodon(config, [match], client_factory=fake)

    assert fake.calls[0][1] == {"visibility": "unlisted"}