import json
import os
from pathlib import Path
import stat

import pytest

from informed_decision.container import prepare_configuration, private_directory, single_writer
from informed_decision.runtime import Runtime
from informed_decision.store import Store


@pytest.fixture
def projected(tmp_path):
    data=tmp_path/'data';data.mkdir()
    run=tmp_path/'run';run.mkdir()
    config={'schema':'informed-decision.review-runtime.v1','evidence_db':str(data/'private/review.sqlite'),
        'approval_origin':'http://approval-engine.approval-engine.svc.cluster.local:8080',
        'policy':{'origin':'http://flex-auth-review.flex-auth.svc.cluster.local:8080',
            'package':'fixture','version':'v1','package_digest':'sha256:'+'a'*64,
            'caller_token_file':str(tmp_path/'not-provisioned-caller')},
        'audit':{'origin':'http://audit-core.audit-core.svc.cluster.local:8080',
            'sender_token_file':str(tmp_path/'not-provisioned-sender')}}
    payload=tmp_path/'projected';payload.write_text(json.dumps(config));payload.chmod(0o444)
    link=tmp_path/'runtime.json';link.symlink_to(payload)
    return link,data,run,config


def test_projected_config_becomes_private_without_reading_or_copying_credentials(projected):
    source,data,run,expected=projected
    result,evidence=prepare_configuration(source,data_root=data,run_root=run)
    assert not result.is_symlink() and stat.S_IMODE(result.stat().st_mode)==0o600
    assert result.stat().st_uid==os.getuid() and json.loads(result.read_text())==expected
    assert stat.S_IMODE(evidence.stat().st_mode)==0o700
    runtime=Runtime.from_file(result)
    assert not runtime.pump.ready()
    assert not Path(expected['policy']['caller_token_file']).exists()
    assert not Path(expected['audit']['sender_token_file']).exists()
    assert sorted(p.name for p in result.parent.iterdir())==['runtime.json']


@pytest.mark.parametrize('fault',['oversize','outside_db','unsafe_directory','symlink_directory'])
def test_unsafe_container_storage_and_config_refused(projected,tmp_path,fault):
    source,data,run,config=projected
    source.resolve().chmod(0o644)
    if fault=='oversize':source.write_text('x'*16385)
    if fault=='outside_db':
        config['evidence_db']=str(tmp_path/'outside.sqlite');source.write_text(json.dumps(config))
    if fault=='unsafe_directory':(data/'private').mkdir(mode=0o755)
    if fault=='symlink_directory':(data/'private').symlink_to(run)
    with pytest.raises((ValueError,FileExistsError)):
        prepare_configuration(source,data_root=data,run_root=run)
    assert not (data/'private/review.sqlite').exists()


def test_second_service_cannot_open_the_same_evidence_volume(tmp_path):
    private=private_directory(tmp_path/'private')
    with single_writer(private):
        with pytest.raises(ValueError,match='another review service'):
            with single_writer(private):pass
    with single_writer(private):pass  # Process/holder release permits restart.


@pytest.mark.parametrize('fault',['symlink','hardlink','mode'])
def test_unsafe_service_lock_refused(tmp_path,fault):
    private=private_directory(tmp_path/'private');lock=private/'serve.lock'
    if fault=='symlink':lock.symlink_to(tmp_path/'outside')
    else:
        lock.touch(mode=0o600)
        if fault=='hardlink':os.link(lock,private/'other')
        else:lock.chmod(0o644)
    with pytest.raises((ValueError,OSError)):
        with single_writer(private):pass


def test_reconfiguration_preserves_persisted_evidence(projected):
    source,data,run,config=projected
    result,_=prepare_configuration(source,data_root=data,run_root=run)
    first=Runtime.from_file(result);digest=first.controller.store.put_document(b'private fixture content')
    source.resolve().chmod(0o644)
    config['policy']['version']='v2';source.write_text(json.dumps(config))
    result,_=prepare_configuration(source,data_root=data,run_root=run)
    second=Runtime.from_file(result)
    assert second.controller.policy.version=='v2'
    with second.controller.store._connection() as db:
        assert db.execute('SELECT content FROM documents WHERE digest=?',(digest,)).fetchone()[0]==b'private fixture content'


@pytest.mark.parametrize('host',[None,'0.0.0.0','localhost'])
def test_listener_exposure_requires_explicit_supported_setting(monkeypatch,host):
    import waitress
    from informed_decision import web
    monkeypatch.delenv('INFD_REVIEW_CONFIG',raising=False)
    monkeypatch.setenv('INFD_KEYCAPE_ISSUER','https://keycape.test')
    monkeypatch.delenv('INFD_LISTEN_HOST',raising=False)
    if host:monkeypatch.setenv('INFD_LISTEN_HOST',host)
    observed=[]
    monkeypatch.setattr(waitress,'serve',lambda app,**kwargs:observed.append(kwargs))
    if host=='localhost':
        with pytest.raises(ValueError):web.main()
        assert not observed
    else:
        web.main();assert observed[0]['host']==(host or '127.0.0.1')