from __future__ import annotations

import io
import json
import logging
import os
from pathlib import Path

import pytest

from datetime import date

from tenbackward import main as main_module
from tenbackward.logging_setup import JsonFormatter
from tenbackward.main import main
from tenbackward.matching import MatchedPost
from tenbackward.publishing import PublishError


def _match(path: str) -> MatchedPost:
    return MatchedPost(
        path=path,
        title=path,
        date=date(2016, 8, 4),
        url=f"https://blog.example.com/2016/08/04/{path.split('-', 3)[-1].removesuffix('.md')}/",
    )


@pytest.fixture()
def capture_logger() -> io.StringIO:
    buf = io.StringIO()
    handler = logging.StreamHandler(buf)
    handler.setFormatter(JsonFormatter())
    target = logging.getLogger("tenbackward")
    target.handlers = [handler]
    target.setLevel(logging.INFO)
    target.propagate = False
    return buf


def _run_lines(buf: io.StringIO) -> list[dict]:
    return [json.loads(line) for line in buf.getvalue().splitlines() if line.strip()]


def _seed_state(data_dir: Path, ids: list[str]) -> None:
    from tenbackward.state import mark_posted_many

    mark_posted_many(list(ids), data_dir)


def test_run_emits_one_info_summary_on_success(env_setup, data_dir, capture_logger, monkeypatch) -> None:
    monkeypatch.setenv("DATA_DIR", str(data_dir))

    def _stub_publish(config, posts, **_kwargs):
        return "stubbed"

    monkeypatch.setattr(main_module, "_iter_candidates", lambda config: [_match("new-1"), _match("already-1")])
    monkeypatch.setattr(main_module, "publish_mastodon", _stub_publish)

    _seed_state(data_dir, ["already-1"])

    rc = main()
    assert rc == 0

    lines = _run_lines(capture_logger)
    summary = [line for line in lines if line.get("event") == "run_complete"]
    assert len(summary) == 1
    payload = summary[0]
    assert payload["scanned"] == 2
    assert payload["matched"] == 2
    assert payload["posted"] == 1
    assert payload["skipped"] == 1
    assert payload["posted_ids"] == ["new-1"]

    from tenbackward.state import load_posted

    state = load_posted(data_dir)
    assert "new-1" in state
    assert "already-1" in state


def test_run_silent_when_no_matches(env_setup, data_dir, capture_logger, monkeypatch) -> None:
    monkeypatch.setenv("DATA_DIR", str(data_dir))
    monkeypatch.setattr(main_module, "_iter_candidates", lambda config: [])

    rc = main()
    assert rc == 0

    lines = _run_lines(capture_logger)
    summary = [line for line in lines if line.get("event") == "run_complete"]
    assert summary == []


def test_run_returns_nonzero_on_pipeline_error(env_setup, data_dir, capture_logger, monkeypatch) -> None:
    monkeypatch.setenv("DATA_DIR", str(data_dir))
    monkeypatch.setenv("MAX_RETRIES", "1")

    def _boom(config):
        raise RuntimeError("boom-token-should-not-appear")

    monkeypatch.setattr(main_module, "_iter_candidates", _boom)

    rc = main()
    assert rc == 1

    lines = _run_lines(capture_logger)
    summary = [line for line in lines if line.get("event") == "run_complete"]
    assert summary == []

    error_lines = [line for line in lines if line.get("level") == "ERROR"]
    assert any("exc_type" in line for line in error_lines)
    assert "boom-token-should-not-appear" not in capture_logger.getvalue()


def test_run_distinguishes_posted_from_skipped_via_ids(env_setup, data_dir, capture_logger, monkeypatch) -> None:
    monkeypatch.setenv("DATA_DIR", str(data_dir))
    monkeypatch.setattr(
        main_module,
        "_iter_candidates",
        lambda config: [_match("alpha"), _match("beta"), _match("gamma")],
    )
    monkeypatch.setattr(
        main_module,
        "publish_mastodon",
        lambda config, posts, **_kwargs: "stubbed",
    )
    _seed_state(data_dir, ["beta"])

    rc = main()
    assert rc == 0

    summary = [line for line in _run_lines(capture_logger) if line.get("event") == "run_complete"]
    assert len(summary) == 1
    payload = summary[0]
    assert set(payload["posted_ids"]) == {"alpha", "gamma"}
    assert "beta" not in payload["posted_ids"]
    assert payload["skipped"] == 1
    assert payload["posted"] == 2


def test_run_publish_failure_leaves_state_untouched(
    env_setup, data_dir, capture_logger, monkeypatch
) -> None:
    monkeypatch.setenv("DATA_DIR", str(data_dir))

    def _boom(config, posts, **_kwargs):
        raise PublishError("publish_failed: stub")

    monkeypatch.setattr(main_module, "_iter_candidates", lambda config: [_match("alpha")])
    monkeypatch.setattr(main_module, "publish_mastodon", _boom)

    rc = main()
    assert rc != 0

    from tenbackward.state import load_posted

    assert load_posted(data_dir) == []
    error_lines = [
        line
        for line in _run_lines(capture_logger)
        if line.get("level") == "ERROR"
    ]
    assert any(line.get("event") == "pipeline_error" for line in error_lines)