"""
Playwright E2E tests for COBOL-Java Migration Platform Web UI.
Server must be running: python -m uvicorn web.api:app --host 127.0.0.1 --port 8000
"""
import pytest
from playwright.sync_api import Page, expect, sync_playwright

BASE_URL = "http://127.0.0.1:8000"


@pytest.fixture(scope="module")
def browser():
    with sync_playwright() as p:
        browser = p.chromium.launch(headless=True)
        yield browser
        browser.close()


@pytest.fixture
def page(browser):
    page = browser.new_page()
    yield page
    page.close()


def test_upload_page_loads(page: Page):
    """验证上传页面正常加载"""
    page.goto(BASE_URL)
    expect(page).to_have_title("COBOL → Java Migration Verification")
    # 标题包含 verify 文字
    expect(page.locator("h1")).to_contain_text("verify")
    # 表单存在
    form = page.locator("#verify-form")
    expect(form).to_be_visible()


def test_form_elements_present(page: Page):
    """验证所有表单元素存在"""
    page.goto(BASE_URL)
    # 4 个文件输入
    expect(page.locator("input[name=copybook]")).to_be_visible()
    expect(page.locator("input[name=cobol_src]")).to_be_visible()
    expect(page.locator("input[name=java_src]")).to_be_visible()
    expect(page.locator("input[name=mapping]")).to_be_visible()
    # Runner 下拉框
    expect(page.locator("select[name=runner]")).to_be_visible()
    expect(page.locator("select[name=runner]")).to_have_value("native")
    # 提交按钮
    expect(page.locator("button[type=submit]")).to_be_visible()
    expect(page.locator("button[type=submit]")).to_contain_text("verify")


def test_submit_empty_form(page: Page):
    """验证空表单提交返回 422 (缺少必填字段)"""
    page.goto(BASE_URL)
    result = page.evaluate("""
        (async () => {
            const fd = new FormData();
            const r = await fetch('http://127.0.0.1:8000/verify', { method: 'POST', body: fd });
            return r.status;
        })()
    """)
    assert result == 422


def test_submit_with_files(page: Page):
    """验证上传测试文件后表单正常响应"""
    page.goto(BASE_URL)
    page.set_input_files("input[name=copybook]",
        "tests/fixtures/simple.cpy")
    page.set_input_files("input[name=cobol_src]",
        "tests/fixtures/simple.cbl")
    page.set_input_files("input[name=mapping]",
        "tests/fixtures/simple.yaml")
    # 用 evaluate 直接调 API 绕过 webkitdirectory 限制
    result = page.evaluate("""
        (async () => {
            const fd = new FormData();
            fd.append('copybook', new Blob(['test'], {type:'text/plain'}), 'test.cpy');
            fd.append('cobol_src', new Blob(['test'], {type:'text/plain'}), 'test.cbl');
            fd.append('java_src', new Blob(['test'], {type:'text/plain'}), 'test.java');
            fd.append('mapping', new Blob(['test'], {type:'text/plain'}), 'test.yaml');
            fd.append('runner', 'native');
            const r = await fetch('http://127.0.0.1:8000/verify', { method: 'POST', body: fd });
            return { status: r.status, body: await r.json() };
        })()
    """)
    assert result["status"] == 202
    assert "task_id" in result["body"]


def test_runner_selector_options(page: Page):
    """验证 Runner 下拉框有两个选项"""
    page.goto(BASE_URL)
    expect(page.locator("select[name=runner]")).to_be_visible()
    count = page.locator("select[name=runner] option").count()
    assert count == 2
    native_val = page.locator("select[name=runner] option").nth(0).get_attribute("value")
    spark_val = page.locator("select[name=runner] option").nth(1).get_attribute("value")
    assert native_val == "native"
    assert spark_val == "spark"


def test_status_endpoint(page: Page):
    """验证 /status/ 端点返回 JSON"""
    page.goto(f"{BASE_URL}/status/nonexistent")
    body = page.locator("body").inner_text()
    assert "404" in body or "not found" in body.lower()


def test_result_endpoint_404(page: Page):
    """验证 /result/ 端点对不存在任务返回 404"""
    page.goto(f"{BASE_URL}/result/nonexistent")
    body = page.locator("body").inner_text()
    assert "404" in body or "not found" in body.lower()


def test_dark_theme_rendered(page: Page):
    """验证 Terminal Dark 主题渲染"""
    page.goto(BASE_URL)
    expect(page.locator(".badge")).to_be_visible()
    expect(page.locator("footer")).to_be_visible()


def test_page_title(page: Page):
    """验证页面标题"""
    page.goto(BASE_URL)
    expect(page).to_have_title("COBOL → Java Migration Verification")