from __future__ import annotations

import base64
import asyncio
import copy
import platform
import sqlite3
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from apps.server.main import create_app
from apps.server.worker import WorkerError

PNG = base64.b64decode("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+jRZkAAAAASUVORK5CYII=")
PASSWORD = "Test-only-maintainer-4829"


class FakeWorker:
    """Contract substitute only; actual browser proof is a separate E2E check."""
    def __init__(self, home: Path):
        self.home, self.sessions, self.counter, self.calls = home, {}, 0, []

    def capture(self, task_id):
        self.counter += 1
        path = self.home / "evidence" / f"test-{self.counter}.png"
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_bytes(PNG)
        return {"url": "http://127.0.0.1/demo", "title": "本机测试", "text": "测试页面", "elements": [{"selector": selector, "tag": tag, "label": label, "kind": kind, "unique": unique, "sensitive": False} for selector, tag, label, kind, unique in [('[data-testid="search-input"]', "input", "搜索", "fill", True), ('[data-testid="search-button"]', "button", "搜索", "click", True), ('[data-testid="result"]', "article", "结果", "read", False), ('[data-testid="detail-link"]', "a", "查看详情", "click", True), ('[data-testid="comment"]', "article", "评论", "read", False)]], "screenshot_path": str(path)}

    async def call(self, method, params):
        self.calls.append((method, copy.deepcopy(params)))
        task_id = params["task_id"]
        if method == "open":
            self.sessions[task_id] = {"ready": False, "keyword": "建材"}
            return {"session_id": task_id, "status": "awaiting_user", "url": params["entry_url"]}
        session = self.sessions.get(task_id)
        if method == "status":
            return {"status": "observing" if session and session["ready"] else "awaiting_user" if session else "closed", "manual_confirmation": bool(session and session["ready"])}
        if not session:
            raise WorkerError("请先打开会话", "session_not_found")
        if method == "ready":
            session["ready"] = True
            return {"manual_confirmation": True}
        if method == "close":
            self.sessions.pop(task_id)
            return {"closed": True}
        if not session["ready"]:
            raise WorkerError("等待人工登录确认", "not_ready")
        if method == "capture":
            return self.capture(task_id)
        if method == "action":
            if params["kind"] == "fill":
                session["keyword"] = params["value"]
            return {"result": [{"text": f"{session['keyword']}采购需求"}] if params["kind"] == "read" else {"completed": True}, "before": self.capture(task_id), "after": self.capture(task_id)}
        if method == "verify":
            value = params["parameters"]["keyword"]
            return {"passed": True, "outputs": {"results": [{"text": value + "采购需求"}], "comments": [{"text": value + "评论"}]}, "errors": [], "evidence": [self.capture(task_id)], "os": platform.system(), "browser_version": "test-browser"}
        raise AssertionError(method)

    async def close(self):
        self.sessions.clear()


@pytest.fixture
def client(tmp_path):
    worker = FakeWorker(tmp_path)
    app = create_app(tmp_path, worker, bootstrap_admin=False, database_url="")
    with TestClient(app, base_url="http://127.0.0.1:8810") as test_client:
        test_client.app_reference = app
        test_client.worker_reference = worker
        yield test_client


def initialize(client):
    status = client.get("/api/auth/status").json()
    client.headers["X-CSRF-Token"] = status["csrf_token"]
    response = client.post("/api/auth/setup", json={"username": "maintainer", "password": PASSWORD})
    assert response.status_code == 200, response.text
    client.headers["X-CSRF-Token"] = response.json()["csrf_token"]
    return response.json()


def task(client):
    response = client.post("/api/learning/tasks", json={"name": "只读搜索", "platform": "demo", "entry_url": "http://127.0.0.1:8810/api/learning/demo-page", "goal": "搜索和读取", "account_key": "test-account", "parameters": {"keyword": "建材"}})
    assert response.status_code == 201, response.text
    return response.json()


def working_candidate(client):
    created = task(client)
    prefix = "/api/learning/tasks/" + created["id"]
    assert client.post(prefix + "/browser/open").status_code == 200
    assert client.post(prefix + "/browser/ready", json={"identity_label": "测试账号"}).status_code == 200
    assert client.post(prefix + "/browser/capture", json={}).status_code == 200
    for action in [{"kind": "fill", "selector": '[data-testid="search-input"]', "parameter": "keyword"}, {"kind": "click", "selector": '[data-testid="search-button"]'}, {"kind": "read", "selector": '[data-testid="result"]', "output_name": "results"}]:
        response = client.post(prefix + "/browser/action", json=action)
        assert response.status_code == 200, response.text
    response = client.post(prefix + "/candidates", json={})
    assert response.status_code == 201, response.text
    return created, response.json()


def test_first_setup_rotates_session_and_requires_csrf(client):
    assert client.get("/api/learning/tasks").status_code == 401
    status = client.get("/api/auth/status").json()
    assert not status["initialized"] and not status["authenticated"]
    assert client.post("/api/auth/setup", json={"username": "maintainer", "password": PASSWORD}).status_code == 403
    old_cookie = client.cookies.get("assistant_maintainer")
    client.headers["X-CSRF-Token"] = status["csrf_token"]
    result = client.post("/api/auth/setup", json={"username": "maintainer", "password": PASSWORD})
    assert result.status_code == 200
    assert result.json()["authenticated"]
    assert client.cookies.get("assistant_maintainer") != old_cookie
    assert result.json()["csrf_token"] != status["csrf_token"]
    assert "httponly" in result.headers["set-cookie"].lower()
    assert "samesite=strict" in result.headers["set-cookie"].lower()


def test_setup_is_one_time_and_password_not_returned(client):
    result = initialize(client)
    assert "password" not in str(result)
    assert client.post("/api/auth/setup", json={"username": "second", "password": PASSWORD}).status_code == 409
    row = client.app_reference.state.store.one("SELECT password_hash FROM operators")
    assert row["password_hash"].startswith("scrypt$") and PASSWORD not in row["password_hash"]


def test_auth_logout_login_and_bad_origin(client):
    initialize(client)
    assert client.get("/api/auth/status", headers={"Origin": "https://unrelated.example"}).status_code == 403
    assert client.get("/api/health", headers={"Host": "unrelated.example"}).status_code == 400
    assert client.post("/api/learning/tasks", json={}, headers={"X-CSRF-Token": "invalid"}).status_code == 403
    response = client.post("/api/auth/logout")
    client.headers["X-CSRF-Token"] = response.json()["csrf_token"]
    assert client.get("/api/learning/tasks").status_code == 401
    assert client.post("/api/auth/login", json={"username": "maintainer", "password": "wrong"}).status_code == 401
    response = client.post("/api/auth/login", json={"username": "maintainer", "password": PASSWORD})
    assert response.status_code == 200


def test_evidence_is_authenticated_and_scoped(client):
    initialize(client)
    created, candidate = working_candidate(client)
    detail = client.get("/api/learning/tasks/" + created["id"]).json()
    image_url = detail["observations"][0]["screenshot_url"]
    assert client.get(image_url).content.startswith(b"\x89PNG")
    assert "screenshot_path" not in str(detail)
    response = client.post("/api/auth/logout")
    assert client.get(image_url).status_code == 401


def test_candidate_is_immutable_and_check_records_append(client):
    initialize(client)
    created, candidate = working_candidate(client)
    url = "/api/learning/candidates/" + candidate["id"]
    first = client.post(url + "/check").json()
    second = client.post(url + "/check").json()
    assert first["status"] == second["status"] == "passed"
    assert first["id"] != second["id"]
    assert len(client.get(url).json()["validations"]) == 2
    with pytest.raises(sqlite3.IntegrityError):
        client.app_reference.state.store.execute("UPDATE candidates SET manifest_json='{}' WHERE id=?", (candidate["id"],))
    with pytest.raises(sqlite3.IntegrityError):
        client.app_reference.state.store.execute("UPDATE validations SET status='failed' WHERE id=?", (first["id"],))
    second_candidate = client.post("/api/learning/tasks/" + created["id"] + "/candidates", json={}).json()
    assert second_candidate["version"] == candidate["version"] + 1
    assert second_candidate["digest"] == candidate["digest"]


def test_static_validation_rejects_empty_candidate(client):
    initialize(client)
    created = task(client)
    candidate = client.post("/api/learning/tasks/" + created["id"] + "/candidates", json={}).json()
    check = client.post("/api/learning/candidates/" + candidate["id"] + "/check").json()
    assert check["status"] == "failed" and check["errors"]
    response = client.post("/api/learning/candidates/" + candidate["id"] + "/verify", json={"expected_outputs": {"results": "建材"}})
    assert response.status_code == 409


def test_real_outputs_are_compared_independently_and_gates_keep_other_os_missing(client):
    initialize(client)
    created, candidate = working_candidate(client)
    prefix = "/api/learning/candidates/" + candidate["id"]
    assert client.post(prefix + "/check").json()["status"] == "passed"
    mismatch = client.post(prefix + "/verify", json={"parameters": {"keyword": "建材"}, "expected_outputs": {"results": "绝不匹配的文本"}}).json()
    assert mismatch["status"] == "failed"
    assert "未包含" in " ".join(mismatch["errors"])
    for keyword in ("建材", "装修"):
        response = client.post(prefix + "/verify", json={"parameters": {"keyword": keyword}, "expected_outputs": {"results": keyword}})
        assert response.status_code == 200, response.text
        assert response.json()["status"] == "passed"
    report = client.post(prefix + "/publish-check").json()
    assert not report["ready"] and not report["published"]
    assert next(item for item in report["checks"] if "不同参数" in item["name"])["passed"]
    expected_os = "macOS" if platform.system() != "Darwin" else "Windows"
    assert not next(item for item in report["checks"] if expected_os in item["name"])["passed"]
    forged = client.post(prefix + "/verify", json={"parameters": {"keyword": "建材"}, "expected_outputs": {"results": "建材"}, "target_os": "macos"})
    assert forged.status_code == 422


def test_preconditions_and_bad_parameters_are_not_silently_accepted(client):
    initialize(client)
    created = task(client)
    prefix = "/api/learning/tasks/" + created["id"]
    assert client.post(prefix + "/browser/capture", json={}).status_code == 409
    client.post(prefix + "/browser/open")
    assert client.post(prefix + "/browser/capture", json={}).status_code == 409
    client.post(prefix + "/browser/ready", json={"identity_label": "测试账号"})
    client.post(prefix + "/browser/capture", json={})
    assert client.post(prefix + "/browser/action", json={"kind": "fill", "selector": "#not-observed", "value": "x"}).status_code == 422
    assert client.post(prefix + "/browser/action", json={"kind": "fill", "selector": '[data-testid="search-input"]', "parameter": "missing"}).status_code == 422


def test_demo_uses_worker_and_closes_account_even_after_success(client):
    initialize(client)
    response = client.post("/api/learning/demo")
    assert response.status_code == 200, response.text
    detail = client.get("/api/learning/tasks/" + response.json()["task_id"]).json()
    assert len(detail["steps"]) == 5
    assert len(detail["validations"]) == 3
    assert detail["browser_status"] == "closed"
    assert not client.worker_reference.sessions
    assert len([call for call in client.worker_reference.calls if call[0] == "verify"]) == 2
    assert client.post("/api/learning/demo").status_code == 200


def test_validation_history_survives_store_reopen(client, tmp_path):
    initialize(client)
    created, candidate = working_candidate(client)
    client.post("/api/learning/candidates/" + candidate["id"] + "/check")
    from apps.server.db import Store
    reopened = Store(tmp_path)
    assert reopened.one("SELECT count(*) AS n FROM validations")["n"] == 1
    assert reopened.one("SELECT count(*) AS n FROM learning_tasks")["n"] == 1


def test_fixture_is_public_but_application_data_is_private(client):
    fixture = client.get("/api/learning/demo-page?q=装修")
    assert fixture.status_code == 200
    assert fixture.text.count('data-testid="detail-link"') == 1
    assert "装修采购需求" in fixture.text
    assert client.get("/api/learning/overview").status_code == 401


def test_artifact_mutation_invalidates_the_evidence(client):
    initialize(client)
    created, candidate = working_candidate(client)
    url = client.get("/api/learning/tasks/" + created["id"]).json()["observations"][0]["screenshot_url"]
    artifact_id = url.rsplit("/", 1)[1]
    row = client.app_reference.state.store.one("SELECT relative_path FROM artifacts WHERE id=?", (artifact_id,))
    (client.app_reference.state.store.home / row["relative_path"]).write_bytes(PNG + b"changed")
    assert client.get(url).status_code == 409


def test_candidate_binds_before_after_evidence_and_refuses_tampered_source(client):
    initialize(client)
    created, candidate = working_candidate(client)
    manifest = candidate["manifest"]
    assert manifest["integrity_version"] == 1
    assert len(manifest["evidence_bindings"]) == 6
    assert all(item["content_digest"] for item in manifest["evidence_bindings"])
    from apps.server.learning_checks import evidence_graph_errors
    assert "动作前后" in " ".join(evidence_graph_errors([{"evidence_id": "a"}], [], {}))
    assert "重复" in " ".join(evidence_graph_errors([], [{"observation_id": "a"}, {"observation_id": "a"}], {}))
    service = client.app_reference.state.learning
    changed = copy.deepcopy(candidate)
    changed["manifest"]["evidence_bindings"][0]["content_digest"] = "0" * 64
    assert any("冻结摘要" in item for item in service.source_integrity_errors(changed))
    first = service.observations(created["id"])[1]
    artifact = service.store.one("SELECT relative_path FROM artifacts WHERE id=?", (first["artifact_id"],))
    (service.store.home / artifact["relative_path"]).write_bytes(PNG + b"tamper")
    check = client.post("/api/learning/candidates/" + candidate["id"] + "/check").json()
    assert check["status"] == "failed" and any("截图摘要" in error for error in check["errors"])


def test_source_steps_candidates_and_validations_reject_deletion(client):
    initialize(client)
    created, candidate = working_candidate(client)
    client.post("/api/learning/candidates/" + candidate["id"] + "/check")
    store = client.app_reference.state.store
    for table in ("observations", "learning_steps", "artifacts", "validations", "candidates"):
        with pytest.raises(sqlite3.IntegrityError, match="immutable|append only"):
            store.execute(f"DELETE FROM {table}")
    with pytest.raises(sqlite3.IntegrityError):
        store.execute("UPDATE observations SET data_json='{}' WHERE task_id=?", (created["id"],))


def test_restart_invalidates_process_session_without_erasing_history(client, tmp_path):
    initialize(client)
    created, candidate = working_candidate(client)
    prefix = "/api/learning/candidates/" + candidate["id"]
    client.post(prefix + "/check")
    client.post("/api/learning/tasks/" + created["id"] + "/browser/ready", json={"identity_label": "测试账号"})
    restarted = create_app(tmp_path, FakeWorker(tmp_path), bootstrap_admin=False, database_url="")
    with TestClient(restarted, base_url="http://127.0.0.1:8810") as second:
        second.cookies.update(client.cookies)
        second.headers["X-CSRF-Token"] = second.get("/api/auth/status").json()["csrf_token"]
        detail = second.get("/api/learning/tasks/" + created["id"]).json()
        assert detail["status"] == "paused"
        assert not detail["browser_readiness"]["ready"]
        assert detail["browser_readiness"]["next_action"] == "open_browser"
        assert len(detail["validations"]) == 1 and len(detail["steps"]) == 3
        result = second.post(prefix + "/verify", json={"expected_outputs": {"results": "建材"}})
        assert result.status_code == 409 and result.json()["detail"]["code"] == "browser_session_required"
        assert len(second.get(prefix).json()["validations"]) == 1


def test_external_browser_close_and_unconfirmed_session_are_preconditions(client):
    initialize(client)
    created, candidate = working_candidate(client)
    task_prefix = "/api/learning/tasks/" + created["id"]
    candidate_prefix = "/api/learning/candidates/" + candidate["id"]
    client.post(candidate_prefix + "/check")
    client.worker_reference.sessions.clear()
    detail = client.get(task_prefix).json()
    assert detail["browser_status"] == "closed" and not detail["browser_readiness"]["ready"]
    client.post(task_prefix + "/browser/open")
    result = client.post(candidate_prefix + "/verify", json={"expected_outputs": {"results": "建材"}})
    assert result.status_code == 409 and result.json()["detail"]["code"] == "browser_confirmation_required"
    assert len(client.get(candidate_prefix).json()["validations"]) == 1


def test_fixed_readback_assertions_do_not_match_keywords_only_in_links():
    from apps.server.learning_checks import output_assertion_checks
    checks = output_assertion_checks({"comments": [{"text": "不相关评论", "href": "https://example.test/?q=建材"}]}, {"comments": "建材"})
    assert not all(item["passed"] for item in checks)
    checks = output_assertion_checks({"comments": [{"text": True}]}, {"comments": "True"})
    assert not next(item for item in checks if item["name"] == "output_schema:comments")["passed"]


def test_health_identifies_the_exact_started_instance(tmp_path, monkeypatch):
    monkeypatch.setenv("ASSISTANT_INSTANCE_ID", "isolated-test-instance")
    app = create_app(tmp_path / "explicit", FakeWorker(tmp_path / "explicit"), database_url="")
    with TestClient(app, base_url="http://127.0.0.1") as test_client:
        assert test_client.get("/api/health").json()["instance_id"] == "isolated-test-instance"
    monkeypatch.delenv("ASSISTANT_INSTANCE_ID")
    random_app = create_app(tmp_path / "random", FakeWorker(tmp_path / "random"), database_url="")
    with TestClient(random_app, base_url="http://127.0.0.1") as test_client:
        first = test_client.get("/api/health").json()["instance_id"]
        assert len(first) == 32 and first != "isolated-test-instance"
        assert test_client.get("/api/health").json()["instance_id"] == first


def test_worker_shutdown_sends_eof_without_waiting_for_active_rpc_lock(tmp_path):
    from apps.server.worker import BrowserWorker

    class InputPipe:
        closed = False
        def close(self):
            self.closed = True

    class OwnedProcess:
        stdin = InputPipe()
        async def wait(self):
            assert self.stdin.closed
            return 0

    async def check():
        worker = BrowserWorker(tmp_path, tmp_path)
        process = OwnedProcess()
        worker.process = process
        async with worker.lock:
            await asyncio.wait_for(asyncio.gather(worker.close(), worker.close()), timeout=0.5)
        assert process.stdin.closed and worker.process is None
        with pytest.raises(WorkerError, match="正常退出"):
            await worker.call("status", {"task_id": "test"})
    asyncio.run(check())