"""sync.json read/write/mint + label resolution."""

from __future__ import annotations

import os
import re
from pathlib import Path

import pytest

from cloud_sync import config as cfgmod


# ---- mint / new_instance_id ----


def test_new_instance_id_shape():
    iid = cfgmod.new_instance_id()
    assert len(iid) == 26
    # base32 alphabet (uppercase + 2-7), no padding
    assert re.fullmatch(r"[A-Z2-7]+", iid), iid


def test_new_instance_id_uniqueness():
    ids = {cfgmod.new_instance_id() for _ in range(200)}
    assert len(ids) == 200  # collisions effectively impossible


def test_mint_returns_filled_config():
    cfg = cfgmod.mint(url="https://x.test")
    assert cfg.url == "https://x.test"
    assert len(cfg.instance_id) == 26
    assert cfg.host_fingerprint  # non-empty hex
    assert cfg.created_at.tzinfo is not None


# ---- read / write / exists / delete ----


def test_exists_false_when_missing(tmp_path: Path):
    assert cfgmod.exists(tmp_path) is False
    assert cfgmod.read(tmp_path) is None


def test_write_then_read_roundtrip(tmp_path: Path):
    cfg = cfgmod.mint(url="https://x.test")
    cfgmod.write(tmp_path, cfg)
    assert cfgmod.exists(tmp_path) is True
    got = cfgmod.read(tmp_path)
    assert got is not None
    assert got.url == cfg.url
    assert got.instance_id == cfg.instance_id
    assert got.host_fingerprint == cfg.host_fingerprint


def test_write_sets_mode_644(tmp_path: Path):
    """sync.json is NOT a secret — it's the opt-in marker + (instance_id, url)
    pair. token is the secret (mode 600)."""
    cfg = cfgmod.mint(url="https://x.test")
    cfgmod.write(tmp_path, cfg)
    mode = cfgmod.config_path(tmp_path).stat().st_mode & 0o777
    assert mode == 0o644


def test_delete_returns_true_when_existed(tmp_path: Path):
    cfgmod.write(tmp_path, cfgmod.mint("https://x"))
    assert cfgmod.delete(tmp_path) is True
    assert cfgmod.exists(tmp_path) is False


def test_delete_returns_false_when_missing(tmp_path: Path):
    assert cfgmod.delete(tmp_path) is False


def test_corrupt_json_returns_none(tmp_path: Path):
    cfg_path = cfgmod.config_path(tmp_path)
    cfg_path.parent.mkdir(parents=True)
    cfg_path.write_text("{not json")
    assert cfgmod.read(tmp_path) is None


def test_wrong_schema_returns_none(tmp_path: Path):
    cfg_path = cfgmod.config_path(tmp_path)
    cfg_path.parent.mkdir(parents=True)
    cfg_path.write_text('{"schema": 999, "url": "x", "instance_id": "y", "created_at": "2026-01-01T00:00:00Z"}')
    assert cfgmod.read(tmp_path) is None


# ---- resolve_label ----


def test_label_flag_wins_over_env(monkeypatch: pytest.MonkeyPatch):
    monkeypatch.setenv("INST_NAME", "from-env")
    assert cfgmod.resolve_label("from-flag", "ABCDEF") == "from-flag"


def test_label_falls_back_to_inst_name(monkeypatch: pytest.MonkeyPatch):
    monkeypatch.setenv("INST_NAME", "Frazaserver 1.21.4")
    monkeypatch.delenv("INST_ID", raising=False)
    assert cfgmod.resolve_label(None, "ABCDEF") == "Frazaserver 1.21.4"


def test_label_falls_back_to_inst_id(monkeypatch: pytest.MonkeyPatch):
    monkeypatch.delenv("INST_NAME", raising=False)
    monkeypatch.setenv("INST_ID", "26.1.2")
    assert cfgmod.resolve_label(None, "ABCDEF") == "26.1.2"


def test_label_last_resort_uses_instance_id_prefix(monkeypatch: pytest.MonkeyPatch):
    monkeypatch.delenv("INST_NAME", raising=False)
    monkeypatch.delenv("INST_ID", raising=False)
    assert cfgmod.resolve_label(None, "ABCDEFGHIJKLMN") == "ABCDEFGH"


def test_label_blank_flag_does_not_override(monkeypatch: pytest.MonkeyPatch):
    """Empty string from --instance-label="" should not win over env."""
    monkeypatch.setenv("INST_NAME", "env-name")
    assert cfgmod.resolve_label("", "ABCDEF") == "env-name"