import subprocess
import sys
from pathlib import Path

from app.settings import load_settings

BACKEND = Path(__file__).resolve().parents[1]


def run_manage(*args, env, cwd):
    return subprocess.run([sys.executable, str(BACKEND / "manage.py"), *args],
                          capture_output=True, text=True, env=env, cwd=cwd)


def base_env(tmp_path, monkeypatch):
    env_file = tmp_path / "backup-dashboard.env"
    monkeypatch.setenv("BACKUP_DASH_ENV_FILE", str(env_file))
    monkeypatch.delenv("BACKUP_DASH_DB", raising=False)
    return env_file, {"BACKUP_DASH_ENV_FILE": str(env_file), "PYTHONPATH": str(BACKEND), "PATH": "/usr/bin:/bin"}


def test_env_file_supplies_db_path_and_real_env_wins(tmp_path, monkeypatch):
    env_file, _ = base_env(tmp_path, monkeypatch)
    env_file.write_text('# comment\nBACKUP_DASH_DB="/srv/from-file.db"\nBACKUP_DASH_RETENTION_DAYS=120\n')
    assert load_settings().db_path == Path("/srv/from-file.db")
    assert load_settings().retention_days == 120
    monkeypatch.setenv("BACKUP_DASH_DB", "/srv/from-env.db")
    assert load_settings().db_path == Path("/srv/from-env.db")


def test_manage_refuses_to_create_db_implicitly(tmp_path, monkeypatch):
    _, env = base_env(tmp_path, monkeypatch)
    workdir = tmp_path / "somewhere-else"
    workdir.mkdir()
    r = run_manage("create-key", "k", env=env, cwd=workdir)
    assert r.returncode != 0
    assert "Database not found" in r.stderr
    assert not (workdir / "backup-dashboard.db").exists()


def test_manage_uses_db_from_env_file(tmp_path, monkeypatch):
    env_file, env = base_env(tmp_path, monkeypatch)
    service_db = tmp_path / "service.db"
    env_file.write_text(f"BACKUP_DASH_DB={service_db}\n")
    assert run_manage("--create", "list-keys", env=env, cwd=tmp_path).returncode == 0  # service's first start
    workdir = tmp_path / "somewhere-else"
    workdir.mkdir()
    r = run_manage("create-key", "veeam-acme", env=env, cwd=workdir)
    assert r.returncode == 0, r.stderr
    assert str(service_db) in r.stderr
    assert "veeam-acme" in run_manage("list-keys", env=env, cwd=tmp_path).stdout
    assert not (workdir / "backup-dashboard.db").exists()