from __future__ import annotations

from pathlib import Path

from playwright.sync_api import expect, sync_playwright

BASE_URL = "http://127.0.0.1:8100"
ARTIFACTS = Path("tests/artifacts")
ARTIFACTS.mkdir(parents=True, exist_ok=True)


def test_overview_shows_ltv_history_and_exports_csv() -> None:
    with sync_playwright() as p:
        browser = p.chromium.launch(headless=True)
        page = browser.new_page(viewport={"width": 1440, "height": 1000})

        page.goto(BASE_URL, wait_until="domcontentloaded", timeout=30000)
        expect(page.locator("text=Create a private workspace URL").first).to_be_visible(timeout=15000)
        page.get_by_role("button", name="Get started").click()
        page.wait_for_url(f"{BASE_URL}/*", timeout=15000)

        expect(page.locator("text=Overview").first).to_be_visible(timeout=15000)
        expect(page.locator("text=Historical LTV").first).to_be_visible(timeout=15000)
        expect(page.locator("text=7 Day").first).to_be_visible(timeout=15000)
        expect(page.locator("text=30 Day").first).to_be_visible(timeout=15000)
        expect(page.locator("text=90 Day").first).to_be_visible(timeout=15000)
        expect(page.get_by_role("button", name="Export CSV")).to_be_visible(timeout=15000)

        series_names = page.evaluate(
            """
            async () => {
              const importMap = JSON.parse(document.querySelector('script[type="importmap"]').textContent).imports;
              const mod = await import(importMap['nicegui-echart']);
              const chart = mod.echarts.getInstanceByDom(document.querySelector('.nicegui-echart'));
              return chart ? chart.getOption().series.map(series => series.name) : [];
            }
            """
        )
        assert series_names == ["LTV", "Margin threshold"]

        with page.expect_download() as download_info:
            page.get_by_role("button", name="Export CSV").click()
        download = download_info.value
        assert download.suggested_filename.endswith("-ltv-history.csv")
        download_path = ARTIFACTS / "ltv-history-export.csv"
        download.save_as(str(download_path))
        csv_content = download_path.read_text()
        assert (
            "snapshot_date,captured_at,ltv_ratio_pct,margin_threshold_pct,loan_amount_usd,collateral_value_usd,spot_price_usd_per_ozt,source"
            in csv_content
        )

        body = page.locator("body").inner_text(timeout=15000)
        assert "RuntimeError" not in body
        assert "Server error" not in body
        assert "Traceback" not in body
        page.screenshot(path=str(ARTIFACTS / "overview-ltv-history.png"), full_page=True)

        browser.close()