from __future__ import annotations

import importlib.util
import sys
from datetime import date, datetime, timedelta
from pathlib import Path

import pytest


def _load_cli():
    path = Path(__file__).parent.parent / "cli" / "snotes.py"
    spec = importlib.util.spec_from_file_location("snotes_cli", path)
    mod = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = mod
    spec.loader.exec_module(mod)
    return mod


cli = _load_cli()


# -- parse_date --------------------------------------------------------------


def test_parse_date_defaults_to_today():
    assert cli.parse_date(None) == date.today()
    assert cli.parse_date("today") == date.today()


def test_parse_date_relative_words():
    assert cli.parse_date("yesterday") == date.today() - timedelta(days=1)
    assert cli.parse_date("tomorrow") == date.today() + timedelta(days=1)


def test_parse_date_offsets():
    assert cli.parse_date("+3") == date.today() + timedelta(days=3)
    assert cli.parse_date("-7") == date.today() - timedelta(days=7)
    assert cli.parse_date("0") == date.today()


def test_parse_date_iso():
    assert cli.parse_date("2026-09-26") == date(2026, 9, 26)


def test_parse_date_invalid():
    with pytest.raises(cli.CliError, match="bad date"):
        cli.parse_date("next friday-ish")


# -- render_template ---------------------------------------------------------


def test_render_template_date():
    body = "# Journal for %date%\n$journal\n\n- \n"
    out = cli.render_template(body, date(2026, 9, 26), "schmeeve")
    assert out.startswith("# Journal for 2026-09-26\n")


def test_render_template_strips_marker_lines():
    body = "# T\n$journal\nmiddle\n  $other  \nend\n"
    out = cli.render_template(body, date(2026, 1, 1), "u")
    assert "$journal" not in out
    assert "$other" not in out
    assert "middle" in out
    assert "end" in out


def test_render_template_keeps_inline_markers():
    # only standalone marker lines are stripped
    body = "# T\nmentions $journal inline\n"
    out = cli.render_template(body, date(2026, 1, 1), "u")
    assert "$journal inline" in out


def test_render_template_vars():
    now = datetime(2026, 9, 26, 14, 30)
    body = "%date% | %time% | %datetime% | %user%"
    out = cli.render_template(body, date(2026, 1, 2), "ilya", now=now)
    assert out == "2026-01-02 | 14:30 | 2026-01-02 14:30 | ilya\n"


def test_render_template_collapses_blank_edges():
    body = "$journal\n\n# Title\n\n"
    out = cli.render_template(body, date(2026, 1, 1), "u")
    assert out == "# Title\n"


# -- extract_title -----------------------------------------------------------


def test_extract_title_heading():
    assert cli.extract_title("# Hello\n\nbody") == "Hello"


def test_extract_title_first_line():
    assert cli.extract_title("plain line\nmore") == "plain line"


def test_extract_title_untitled():
    assert cli.extract_title("  \n\n") == "Untitled"


# -- config ------------------------------------------------------------------


def test_config_round_trip(tmp_path, monkeypatch):
    path = tmp_path / "cfg" / "config.json"
    monkeypatch.setattr(cli, "CONFIG_PATH", path)
    cfg = cli.Config(url="http://sno.tes/", user="schmeeve", token="tok123")
    cli.save_config(cfg)

    loaded = cli.load_config()
    assert loaded.url == "http://sno.tes"  # trailing slash stripped
    assert loaded.user == "schmeeve"
    assert loaded.token == "tok123"
    assert (path.stat().st_mode & 0o777) == 0o600


def test_load_config_missing(tmp_path, monkeypatch):
    monkeypatch.setattr(cli, "CONFIG_PATH", tmp_path / "nope.json")
    with pytest.raises(cli.CliError, match="no config"):
        cli.load_config()


def test_load_config_bad_json(tmp_path, monkeypatch):
    path = tmp_path / "config.json"
    path.write_text("{not json")
    monkeypatch.setattr(cli, "CONFIG_PATH", path)
    with pytest.raises(cli.CliError, match="bad config"):
        cli.load_config()