from pathlib import Path


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


def test_daily_sales_canvas_is_primary_and_fallback_is_opt_in():
    css = (ROOT / "web/static/css/page-daily-sales.css").read_text(encoding="utf-8")
    script = (ROOT / "web/static/js/page-daily-sales.js").read_text(encoding="utf-8")

    assert ".chart-container.has-html-chart canvas" not in css
    assert ".chart-container.chart-fallback-active canvas" in css
    assert ".chart-container.chart-empty-active canvas" in css
    assert ".chart-container:not(.chart-fallback-active) .chart-fallback-list" in css
    assert "node.content && node.content.textContent" in script
    assert "chart-empty-active" in script
    assert "Math.abs(Number(value)) > 1e-9" in script
    render_body = script.split("function renderAllCharts()", 1)[1].split("function bootCharts()", 1)[0]
    assert "renderHtmlChartFallbacks();" not in render_body
    assert "catch(error =>" in script
    assert "renderHtmlChartFallbacks();" in script.split("catch(error =>", 1)[1]


def test_growth_analysis_canvas_is_primary_and_fallback_is_opt_in():
    css = (ROOT / "web/static/css/page-growth-bem.css").read_text(encoding="utf-8")
    script = (ROOT / "web/static/js/page-growth.js").read_text(encoding="utf-8")

    assert ".ga-chart-card__body.has-html-chart canvas" not in css
    assert ".ga-chart-card__body.chart-fallback-active canvas" in css
    assert ".ga-chart-card__body.chart-empty-active canvas" in css
    assert ".ga-chart-card__body:not(.chart-fallback-active) .ga-chart-snapshot" in css
    assert "node.content && node.content.textContent" in script
    assert "chart-empty-active" in script
    assert "Math.abs(Number(value)) > 1e-9" in script
    render_body = script.split("function renderCharts()", 1)[1].split("function bootCharts()", 1)[0]
    assert "renderHtmlChartFallbacks();" not in render_body
    assert "catch(error =>" in script
    assert "renderHtmlChartFallbacks();" in script.split("catch(error =>", 1)[1]


def test_chart_theme_has_cdn_timeout_and_fallback_sources():
    script = (ROOT / "web/static/js" / "analysis-chart-theme.js").read_text(encoding="utf-8")

    assert "CHART_LOAD_TIMEOUT_MS" in script
    assert "Chart.js 載入逾時" in script
    assert "cdn.jsdelivr.net/npm/chart.js@4.4.6" in script
    assert "unpkg.com/chart.js@4.4.6" in script
    assert "cdnjs.cloudflare.com/ajax/libs/Chart.js/4.4.6" in script
    assert "!Array.isArray(ds.backgroundColor)" in script
    assert "!Array.isArray(ds.borderColor)" in script
    assert script.index("...originalScale") < script.index("border: { color: theme.faint")
    assert "callback: v => formatNumber(v)" not in script
    assert "autoSkip: true" in script


def test_sales_chart_runtime_guard_rejects_axis_only_canvases():
    script = (ROOT / "scripts" / "check_sales_charts_runtime.js").read_text(encoding="utf-8")

    assert "nonZeroPoints" in script
    assert "colorPixels" in script
    assert "has no colored chart marks" in script
    assert "has no non-zero dataset values" in script


def test_all_analysis_pages_have_runtime_chart_integrity_contracts():
    script = (ROOT / "scripts" / "check_analysis_chart_integrity.js").read_text(encoding="utf-8")

    for route in (
        "/daily_sales?month=2026-04",
        "/growth_analysis?start_month=2026-04&end_month=2026-04",
        "/sales_analysis?start_date=2026-04-01&end_date=2026-04-30",
        "/monthly_summary_analysis?start_month=2026-04&end_month=2026-04",
    ):
        assert route in script
    for viewport in ("1440, height: 1000", "1024, height: 900", "390, height: 844"):
        assert viewport in script
    assert "loading overlay remains visible" in script
    assert "has no colored chart marks" in script
    assert "extreme percent values are not bounded with traceable markers" in script
    assert "single point is not visibly emphasized" in script
    assert "hides drawable payload behind an empty state" in script
    assert "analysis tab lost the active period" in script
    assert "rendered numeric indexes instead of product labels" in script
    assert "contains labels outside the selected April period" in script
    assert "explicitEmpty" in script


def test_analysis_chart_failure_states_are_explicit_and_bounded():
    sales = (ROOT / "web/static/js/page-sales-analysis.js").read_text(encoding="utf-8")
    daily = (ROOT / "web/static/js/page-daily-sales.js").read_text(encoding="utf-8")
    growth = (ROOT / "web/static/js/page-growth.js").read_text(encoding="utf-8")
    monthly = (ROOT / "web/static/js/page-monthly-summary.js").read_text(encoding="utf-8")

    assert "document.documentElement.dataset.salesCharts = 'ready'" in sales
    assert "series.chart_values" in sales
    assert "renderChartEmpty(bcgEl" in sales
    assert "renderChartEmpty(hmEl" in sales
    assert "originalValue" in daily
    assert "clippedCount" in daily
    assert "function dateAxis(element)" in daily
    assert "overlapping date ticks" in (ROOT / "scripts/check_analysis_chart_integrity.js").read_text(encoding="utf-8")
    assert "beginAtZero: true" in growth
    assert "pointRadiusFor" in growth
    assert "REQUEST_TIMEOUT_MS" in monthly
    assert "activeFetchController.abort()" in monthly
    assert "const refreshForViewport = () => {" in monthly
    assert "const refreshForViewport = () => fetchData()" not in monthly
    assert "dataset.monthlyCharts = 'ready'" in monthly
    assert "safeHtmlText(p.value[3])" in monthly
    assert "safeHtmlText(ps[0].name)" in monthly


def test_analysis_tables_use_local_traditional_chinese_language_contract():
    helper = (ROOT / "web/static/js/datatables-zh-hant.js").read_text(encoding="utf-8")
    assert "window.EwoooCDataTableLanguage" in helper
    assert "沒有符合條件的資料" in helper

    assets = [
        ROOT / "web/static/js/page-daily-sales.js",
        ROOT / "web/static/js/page-sales-analysis.js",
        ROOT / "web/static/js/page-monthly-summary.js",
        ROOT / "templates/abc_analysis_detail.html",
    ]
    for asset in assets:
        source = asset.read_text(encoding="utf-8")
        assert "cdn.datatables.net/plug-ins" not in source
        assert "EwoooCDataTableLanguage()" in source