math_cms/scripts/report_teacher_weekly_stats.php

<?php

/**
 * 按「自然日」统计：近 N 个自然日（今日为 0 点—生成时刻）vs 紧邻的前 N 个完整自然日；exam_analysis_results 按 paper_id 去重计套。
 * 按老师：学案/分析/学生数为「本 / 上」并列；保留学案·环比、学情·环比。
 * 用法：
 *   php scripts/report_teacher_weekly_stats.php
 *   TEACHER_WEEKLY_REPORT_DAYS=14 php scripts/report_teacher_weekly_stats.php
 *   php scripts/report_teacher_weekly_stats.php > storage/app/reports/teacher-weekly-stats-$(date +%Y-%m-%d)_$(date +%H%M%S).md
 *
 * 环境变量 / artisan：TEACHER_WEEKLY_REPORT_DAYS（默认 7）= 本/上周期各包含几个自然日。时区：config app.timezone。
 */

require __DIR__ . '/../vendor/autoload.php';

$app = require_once __DIR__ . '/../bootstrap/app.php';
$app->make(\Illuminate\Contracts\Console\Kernel::class)->bootstrap();

$tz = (string) config('app.timezone', 'UTC');

$reportPeriodDays = 7;
$envDays = getenv('TEACHER_WEEKLY_REPORT_DAYS');
if ($envDays !== false && $envDays !== '') {
    $reportPeriodDays = max(1, min(366, (int) $envDays));
}

/** 本周期：自「今日 0 点」往回数第 N 天 0 点起，至当前时刻。上周期：紧邻的前 N 个完整自然日。 */
$endCurrent = now()->timezone($tz);
$todayStart = $endCurrent->copy()->startOfDay();
$startCurrent = $todayStart->copy()->subDays($reportPeriodDays - 1);
$startPrev = $todayStart->copy()->subDays(2 * $reportPeriodDays - 1);
$endPrev = $todayStart->copy()->subDays($reportPeriodDays - 1);

$db = \Illuminate\Support\Facades\DB::class;

$sumPapers = static function ($from, $toExclusive) use ($db) {
    $q = $db::table('papers')
        ->whereNotNull('teacher_id')
        ->where('teacher_id', '!=', '')
        ->where('created_at', '>=', $from);
    if ($toExclusive !== null) {
        $q->where('created_at', '<', $toExclusive);
    }

    return (int) $q->count();
};

/** 学情分析：以卷子为单位，同一 paper_id 在区间内多条记录只计 1 */
$countDistinctAnalysisPapers = static function ($from, $toExclusive) use ($db) {
    $q = $db::table('exam_analysis_results as ear')
        ->join('papers as p', 'p.paper_id', '=', 'ear.paper_id')
        ->whereNotNull('p.teacher_id')
        ->where('p.teacher_id', '!=', '')
        ->where('ear.created_at', '>=', $from);
    if ($toExclusive !== null) {
        $q->where('ear.created_at', '<', $toExclusive);
    }

    return (int) $q->distinct()->count('ear.paper_id');
};

$countActiveTeachers = static function ($from, $toExclusive) use ($db) {
    $q = $db::table('papers')
        ->whereNotNull('teacher_id')
        ->where('teacher_id', '!=', '')
        ->where('created_at', '>=', $from);
    if ($toExclusive !== null) {
        $q->where('created_at', '<', $toExclusive);
    }

    return (int) $q->distinct()->count('teacher_id');
};

$totalPapersCur = $sumPapers($startCurrent, $endCurrent);
$totalPapersPrev = $sumPapers($startPrev, $endPrev);
$totalAnalysisCur = $countDistinctAnalysisPapers($startCurrent, $endCurrent);
$totalAnalysisPrev = $countDistinctAnalysisPapers($startPrev, $endPrev);
$teachersCur = $countActiveTeachers($startCurrent, $endCurrent);
$teachersPrev = $countActiveTeachers($startPrev, $endPrev);

$wowLine = static function (int $cur, int $prev): string {
    $delta = $cur - $prev;
    if ($prev === 0) {
        if ($cur === 0) {
            return '0';
        }

        return sprintf('+%d（上周期0）', $delta);
    }
    $pct = round(($delta / $prev) * 100, 2);
    $sign = $delta >= 0 ? '+' : '';
    $dir = match (true) {
        $delta > 0 => '↑',
        $delta < 0 => '↓',
        default => '→',
    };

    return sprintf('%s%d（%s%.2f%%）%s', $sign, $delta, $sign, $pct, $dir);
};

/** 总量表环比列：正增长着色（学案蓝 / 学情橙 / 其余绿） */
$wowLineHtml = static function (int $cur, int $prev, string $posColor = '#16a34a') use ($wowLine): string {
    $plain = $wowLine($cur, $prev);
    if ($cur > $prev) {
        return '<span style="color:'.$posColor.';font-weight:600;">'.$plain.'</span>';
    }

    return $plain;
};

/** 环比列：正增长用 $posColor（学案蓝 / 学情橙 / 默认绿） */
$compareCellHtml = static function (int $cur, int $prev, string $posColor = '#16a34a'): string {
    $d = $cur - $prev;
    if ($d === 0) {
        return '0';
    }
    if ($prev === 0) {
        if ($cur === 0) {
            return '0';
        }

        return '<span style="color:'.$posColor.';font-weight:600;">+'.$d.'（上0）</span>';
    }
    $pct = round(($d / $prev) * 100, 1);
    $sign = $d > 0 ? '+' : '';
    $text = sprintf('%s%d（%s%.1f%%）', $sign, $d, $sign, $pct);
    if ($d > 0) {
        return '<span style="color:'.$posColor.';font-weight:600;">'.$text.'</span>';
    }

    return $text;
};

/** 「本 / 上」并列：本>上时本侧用强调色（与上方左/右图折线一致）；「 / 」与上周期数字固定深灰黑 */
$slashPairAccentHtml = static function (int $cur, int $prev, string $accent): string {
    $rest = '<span style="color:#111827;font-weight:normal;"> / '.$prev.'</span>';
    if ($cur > $prev) {
        return '<span style="color:'.$accent.';font-weight:700;">'.$cur.'</span>'.$rest;
    }

    return '<span style="color:#111827;font-weight:normal;">'.$cur.'</span>'.$rest;
};

/** 与每日对比图一致：学案蓝、学情橙、学生绿 */
$colorPapers = '#2563eb';
$colorAnalysis = '#ea580c';
$colorStudents = '#16a34a';

$byTeacher = \Illuminate\Support\Facades\DB::table('papers')
    ->whereNotNull('teacher_id')
    ->where('teacher_id', '!=', '')
    ->where('created_at', '>=', $startCurrent)
    ->where('created_at', '<', $endCurrent)
    ->selectRaw('teacher_id, COUNT(*) as paper_count')
    ->groupBy('teacher_id')
    ->get();

// 本时间窗内学情：按 ear.paper_id 去重后归到 papers.teacher_id
$analysisByTeacher = \Illuminate\Support\Facades\DB::table('exam_analysis_results as ear')
    ->join('papers as p', 'p.paper_id', '=', 'ear.paper_id')
    ->whereNotNull('p.teacher_id')
    ->where('p.teacher_id', '!=', '')
    ->where('ear.created_at', '>=', $startCurrent)
    ->where('ear.created_at', '<', $endCurrent)
    ->selectRaw('p.teacher_id, COUNT(DISTINCT ear.paper_id) AS paper_set_count')
    ->groupBy('p.teacher_id')
    ->get();

$analysisMap = [];
foreach ($analysisByTeacher as $r) {
    $analysisMap[(string) $r->teacher_id] = (int) $r->paper_set_count;
}

$paperMap = [];
foreach ($byTeacher as $r) {
    $paperMap[(string) $r->teacher_id] = (int) $r->paper_count;
}

$byTeacherPrev = $db::table('papers')
    ->whereNotNull('teacher_id')
    ->where('teacher_id', '!=', '')
    ->where('created_at', '>=', $startPrev)
    ->where('created_at', '<', $endPrev)
    ->selectRaw('teacher_id, COUNT(*) as paper_count')
    ->groupBy('teacher_id')
    ->get();

$analysisByTeacherPrev = $db::table('exam_analysis_results as ear')
    ->join('papers as p', 'p.paper_id', '=', 'ear.paper_id')
    ->whereNotNull('p.teacher_id')
    ->where('p.teacher_id', '!=', '')
    ->where('ear.created_at', '>=', $startPrev)
    ->where('ear.created_at', '<', $endPrev)
    ->selectRaw('p.teacher_id, COUNT(DISTINCT ear.paper_id) AS paper_set_count')
    ->groupBy('p.teacher_id')
    ->get();

$paperMapPrev = [];
foreach ($byTeacherPrev as $r) {
    $paperMapPrev[(string) $r->teacher_id] = (int) $r->paper_count;
}

$analysisMapPrev = [];
foreach ($analysisByTeacherPrev as $r) {
    $analysisMapPrev[(string) $r->teacher_id] = (int) $r->paper_set_count;
}

/** 学生数：组卷 ∪ 学情，student_id 合并去重（按老师、时间窗） */
$studentUnionSql = <<<'SQL'
SELECT u.teacher_id, COUNT(DISTINCT u.student_id) AS c
FROM (
    SELECT teacher_id, student_id FROM papers
    WHERE teacher_id IS NOT NULL AND teacher_id != ''
    AND student_id IS NOT NULL AND student_id != ''
    AND created_at >= ? AND created_at < ?
    UNION
    SELECT p.teacher_id, ear.student_id
    FROM exam_analysis_results ear
    INNER JOIN papers p ON p.paper_id = ear.paper_id
    WHERE p.teacher_id IS NOT NULL AND p.teacher_id != ''
    AND ear.student_id IS NOT NULL AND ear.student_id != ''
    AND ear.created_at >= ? AND ear.created_at < ?
) u
GROUP BY u.teacher_id
SQL;

$studentUnionCurRows = $db::select($studentUnionSql, [$startCurrent, $endCurrent, $startCurrent, $endCurrent]);
$studentUnionPrevRows = $db::select($studentUnionSql, [$startPrev, $endPrev, $startPrev, $endPrev]);

$studentUnionCurMap = [];
foreach ($studentUnionCurRows as $row) {
    $studentUnionCurMap[(string) $row->teacher_id] = (int) $row->c;
}
$studentUnionPrevMap = [];
foreach ($studentUnionPrevRows as $row) {
    $studentUnionPrevMap[(string) $row->teacher_id] = (int) $row->c;
}

$names = \Illuminate\Support\Facades\DB::table('teachers')->pluck('name', 'teacher_id');
$nameStrMap = [];
foreach ($names as $tid => $nm) {
    $nameStrMap[(string) $tid] = $nm;
}

$rows = [];
foreach ($paperMap as $tid => $paperCount) {
    $rows[] = [
        'teacher_id' => $tid,
        'name' => (string) ($nameStrMap[$tid] ?? $tid),
        'papers' => $paperCount,
        'analysis_sets' => (int) ($analysisMap[$tid] ?? 0),
        'papers_prev' => (int) ($paperMapPrev[$tid] ?? 0),
        'analysis_sets_prev' => (int) ($analysisMapPrev[$tid] ?? 0),
    ];
}

usort($rows, static fn ($a, $b) => $b['papers'] <=> $a['papers']);

$windowCur = sprintf(
    '%s ~ %s',
    $startCurrent->format('Y-m-d H:i:s'),
    $endCurrent->format('Y-m-d H:i:s')
);
$windowPrev = sprintf(
    '%s ~ %s',
    $startPrev->format('Y-m-d H:i:s'),
    $endPrev->format('Y-m-d H:i:s')
);

$generatedAt = $endCurrent->format('Y-m-d H:i:s');

/**
 * 按自然日切段（app.timezone）：每天一格；本周期末段为「今日 0 点—当前时刻」。
 * 学案：当日创建的组卷数，各日之和 = 窗口总量。
 * 学情：该自然日内有 analysis 记录的卷去重（同日多条只计 1）；跨日同一卷可在多日重复出现，故各日之和可不等于上方「窗口内卷仅计一次」的总量。
 *
 * @return array{labels: list<string>, papers: list<int>, analysis: list<int>}
 */
$dailyNaturalSlices = static function (string $which) use ($db, $reportPeriodDays, $todayStart, $endCurrent): array {
    $n = $reportPeriodDays;
    $labels = [];
    $papers = [];
    $analysis = [];

    $countAnalysisSetsInRange = static function ($from, $toExclusive) use ($db): int {
        return (int) $db::table('exam_analysis_results as ear')
            ->join('papers as p', 'p.paper_id', '=', 'ear.paper_id')
            ->whereNotNull('p.teacher_id')
            ->where('p.teacher_id', '!=', '')
            ->where('ear.created_at', '>=', $from)
            ->where('ear.created_at', '<', $toExclusive)
            ->distinct()
            ->count('ear.paper_id');
    };

    if ($which === 'current') {
        for ($i = 0; $i < $n; $i++) {
            $dayStart = $todayStart->copy()->subDays($n - 1 - $i);
            $dayEnd = ($i < $n - 1) ? $dayStart->copy()->addDay() : $endCurrent;
            $labels[] = $dayStart->format('j');
            $papers[] = (int) $db::table('papers')
                ->whereNotNull('teacher_id')
                ->where('teacher_id', '!=', '')
                ->where('created_at', '>=', $dayStart)
                ->where('created_at', '<', $dayEnd)
                ->count();
            $analysis[] = $countAnalysisSetsInRange($dayStart, $dayEnd);
        }
    } else {
        for ($i = 0; $i < $n; $i++) {
            $dayStart = $todayStart->copy()->subDays(2 * $n - 1 - $i);
            $dayEnd = $dayStart->copy()->addDay();
            $labels[] = $dayStart->format('j');
            $papers[] = (int) $db::table('papers')
                ->whereNotNull('teacher_id')
                ->where('teacher_id', '!=', '')
                ->where('created_at', '>=', $dayStart)
                ->where('created_at', '<', $dayEnd)
                ->count();
            $analysis[] = $countAnalysisSetsInRange($dayStart, $dayEnd);
        }
    }

    return ['labels' => $labels, 'papers' => $papers, 'analysis' => $analysis];
};

$curDaily = $dailyNaturalSlices('current');
$prevDaily = $dailyNaturalSlices('prev');

/** 左侧：学案（组卷）套数；右侧：学情分析套数（卷去重）。横轴：本周期日 / 上周期同序号日。 */
$buildDualChartsHtml = static function (array $curDaily, array $prevDaily): string {
    $axisCur = $curDaily['labels'];
    $axisPrev = $prevDaily['labels'];
    $pc = $curDaily['papers'];
    $ac = $curDaily['analysis'];
    $pp = $prevDaily['papers'];
    $ap = $prevDaily['analysis'];

    $halfSvg = static function (
        array $labelsCur,
        array $labelsPrev,
        array $cur,
        array $prev,
        string $strokeCur,
        string $strokePrev,
        string $legCur,
        string $legPrev
    ): string {
        $maxY = max(1, ...$cur, ...$prev);
        $W = 296;
        $H = 256;
        $padL = 42;
        /** 右侧、顶部留白：数值标签 text-anchor=middle 时不依赖末列特殊锚点 */
        $padR = 62;
        $padT = 72;
        $padB = 56;
        $gw = $W - $padL - $padR;
        $gh = $H - $padT - $padB;
        $n = max(1, count($labelsCur));
        $xAt = static function (int $i) use ($padL, $gw, $n): float {
            return $padL + ($n <= 1 ? $gw / 2 : $gw * $i / ($n - 1));
        };
        $yAt = static function (int $v) use ($padT, $gh, $maxY): float {
            return $padT + $gh - ($v / $maxY) * $gh;
        };
        $lineWithDots = static function (array $vals, string $stroke, string $dash, float $sw = 1.6) use ($xAt, $yAt, $n): string {
            $pts = [];
            $circles = '';
            for ($i = 0; $i < $n; $i++) {
                $x = $xAt($i);
                $y = $yAt((int) $vals[$i]);
                $pts[] = round($x, 1).','.round($y, 1);
                $circles .= sprintf(
                    '<circle cx="%.1f" cy="%.1f" r="3.2" fill="%s" stroke="#fff" stroke-width="1"/>',
                    $x,
                    $y,
                    $stroke
                );
            }
            $poly = implode(' ', $pts);
            $dashAttr = $dash !== '' ? ' stroke-dasharray="'.$dash.'"' : '';

            return '<polyline fill="none" stroke="'.$stroke.'" stroke-width="'.$sw.'"'.$dashAttr.' points="'.$poly.'" />'.$circles;
        };

        /** 标签：每列只放一条「本/上」，y = 最高点y - 固定偏移（以 dominant-baseline=middle 作为中心y） */
        $labelFillCur = $strokeCur === '#2563eb' ? '#1d4ed8' : '#c2410c';
        $labelFillPrev = $strokePrev === '#93c5fd' ? '#475569' : '#78716c';
        $valueLabels = '<g font-family="sun-exta,sans-serif">';
        $labelOffset = 22; // 标签中心到点的固定上移像素
        for ($vi = 0; $vi < $n; $vi++) {
            $xv = $xAt($vi);
            $yCv = $yAt((int) $cur[$vi]);
            $yPv = $yAt((int) $prev[$vi]);
            $vC = (int) $cur[$vi];
            $vP = (int) $prev[$vi];
            $yUpper = min($yCv, $yPv);
            // 允许跑到绘图区上方的留白里；只在极端情况下防止贴到 SVG 顶边
            $baseY = max(14, $yUpper - $labelOffset);
            $valueLabels .= sprintf(
                '<text x="%.1f" y="%.1f" text-anchor="middle" dominant-baseline="middle" font-size="9" font-family="sun-exta,sans-serif"><tspan fill="%s">%d</tspan><tspan fill="#94a3b8">/</tspan><tspan fill="%s">%d</tspan></text>',
                $xv,
                $baseY,
                $labelFillCur,
                $vC,
                $labelFillPrev,
                $vP
            );
        }
        $valueLabels .= '</g>';

        $xAxisY = $padT + $gh;
        $tickTxt = '';
        $axisRowY = $H - 48;
        for ($i = 0; $i < $n; $i++) {
            $x = $xAt($i);
            $lc = htmlspecialchars((string) ($labelsCur[$i] ?? ''), ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
            $lp = htmlspecialchars((string) ($labelsPrev[$i] ?? ''), ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
            $tickTxt .= sprintf(
                '<text x="%.1f" y="%d" text-anchor="middle" font-size="8" font-family="sun-exta,sans-serif"><tspan fill="#111827">%s</tspan><tspan fill="#94a3b8">/</tspan><tspan fill="#475569">%s</tspan></text>',
                $x,
                $axisRowY,
                $lc,
                $lp
            );
        }

        $yTick = '';
        for ($k = 0; $k <= 4; $k++) {
            $v = (int) round($maxY * $k / 4);
            $y = $yAt($v);
            $yTick .= sprintf(
                '<line x1="%d" y1="%.1f" x2="%d" y2="%.1f" stroke="#e5e7eb" stroke-width="1"/>',
                $padL,
                $y,
                $padL + $gw,
                $y
            );
            $yTick .= sprintf(
                '<text x="%d" y="%.1f" font-size="8" fill="#6b7280" font-family="sun-exta,sans-serif">%d</text>',
                2,
                $y + 3,
                $v
            );
        }

        $legend = '<g font-family="sun-exta,sans-serif" font-size="9">';
        $lx = $padL + 4;
        $ly = $H - 26;
        $items = [
            [$strokeCur, $legCur, ''],
            [$strokePrev, $legPrev, '6,4'],
        ];
        foreach ($items as $idx => $it) {
            $yy = $ly + $idx * 12;
            $legend .= sprintf(
                '<line x1="%d" y1="%d" x2="%d" y2="%d" stroke="%s" stroke-width="2" %s/>',
                $lx,
                $yy,
                $lx + 16,
                $yy,
                $it[0],
                $it[2] !== '' ? 'stroke-dasharray="'.$it[2].'"' : ''
            );
            $legend .= sprintf(
                '<text x="%d" y="%d" fill="#111">%s</text>',
                $lx + 20,
                $yy + 4,
                htmlspecialchars($it[1], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8')
            );
        }
        $legend .= '</g>';

        $svg = sprintf(
            '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 %d %d" width="100%%" height="auto" style="max-width:100%%;">',
            $W,
            $H
        );
        $svg .= sprintf('<rect x="0" y="0" width="%d" height="%d" fill="#fafafa"/>', $W, $H);
        $svg .= $yTick;
        $svg .= sprintf('<line x1="%d" y1="%.1f" x2="%.1f" y2="%.1f" stroke="#9ca3af" stroke-width="1"/>', $padL, $xAxisY, $padL + $gw, $xAxisY);
        $svg .= $lineWithDots($prev, $strokePrev, '6,4', 1.4);
        $svg .= $lineWithDots($cur, $strokeCur, '', 1.8);
        $svg .= $valueLabels;
        $svg .= $tickTxt;
        $svg .= $legend;
        $svg .= '</svg>';

        return $svg;
    };

    $left = $halfSvg($axisCur, $axisPrev, $pc, $pp, '#2563eb', '#93c5fd', '学案·本周期', '学案·上周期');
    $right = $halfSvg($axisCur, $axisPrev, $ac, $ap, '#ea580c', '#fdba74', '学情·本周期', '学情·上周期');

    return '<table class="weekly-chart-pair" style="width:100%;border-collapse:collapse;margin:0;"><tr>'
        .'<td style="width:50%;vertical-align:top;padding:2px 5px 2px 0;">'.$left.'</td>'
        .'<td style="width:50%;vertical-align:top;padding:2px 0 2px 5px;">'.$right.'</td>'
        .'</tr></table>';
};

$chartSvg = $buildDualChartsHtml($curDaily, $prevDaily);

// ============================================================
// 1 月 6 日起每日学案量点状图
// ============================================================
$jan6 = $todayStart->copy()->setDate(2026, 1, 6);
$totalCumDays = (int) $jan6->diffInDays($todayStart) + 1;

$dotLabels = [];
$dotValues = [];
for ($i = 0; $i < $totalCumDays; $i++) {
    $dayStart = $jan6->copy()->addDays($i);
    $dayEnd = $dayStart->copy()->addDay();
    $dotLabels[] = $dayStart->format('m/d');
    $dotValues[] = (int) $db::table('papers')
        ->whereNotNull('teacher_id')
        ->where('teacher_id', '!=', '')
        ->where('created_at', '>=', $dayStart)
        ->where('created_at', '<', $dayEnd)
        ->count();
}
$totalDays = count($dotValues);
$cumulativeTotal = array_sum($dotValues);
$cumulativeAvg = $totalDays > 0 ? round($cumulativeTotal / $totalDays, 1) : 0;
$cumulativeMax = $totalDays > 0 ? max($dotValues) : 0;
$cumulativeMaxDate = '';
foreach ($dotValues as $di => $dv) {
    if ($dv === $cumulativeMax && $cumulativeMax === $cumulativeMax) {
        $cumulativeMaxDate = $dotLabels[$di];
        break;
    }
}

$buildDotChartHtml = static function (array $labels, array $values, int $totalDays, float $avg) use ($tz, $generatedAt): string {
    $maxY = max(1, ...$values);
    $W = 800;
    $H = 360;
    $padL = 48;
    $padR = 50;
    $padT = 32;
    $padB = 68;
    $gw = $W - $padL - $padR;
    $gh = $H - $padT - $padB;
    $n = max(1, count($labels));

    $xAt = static function (int $i) use ($padL, $gw, $n): float {
        return $padL + ($n <= 1 ? $gw / 2 : $gw * $i / ($n - 1));
    };
    $yAtF = static function (float $v) use ($padT, $gh, $maxY): float {
        return $padT + $gh - ($v / $maxY) * $gh;
    };
    $yAt = static function (int $v) use ($yAtF): float {
        return $yAtF((float) $v);
    };

    $svg = sprintf(
        '<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d">',
        $W, $H, $W, $H
    );
    $svg .= sprintf('<rect x="0" y="0" width="%d" height="%d" fill="#fafafa"/>', $W, $H);

    // Y grid
    $yTickSteps = 5;
    for ($k = 0; $k <= $yTickSteps; $k++) {
        $v = (int) round($maxY * $k / $yTickSteps);
        $y = $yAt($v);
        $svg .= sprintf(
            '<line x1="%d" y1="%.1f" x2="%d" y2="%.1f" stroke="#e5e7eb" stroke-width="1"/>',
            $padL, $y, $padL + $gw, $y
        );
        $svg .= sprintf(
            '<text x="%d" y="%.1f" font-size="8" fill="#6b7280">%d</text>',
            4, $y + 3, $v
        );
    }

    // X axis
    $xAxisY = $padT + $gh;
    $svg .= sprintf(
        '<line x1="%d" y1="%.1f" x2="%d" y2="%.1f" stroke="#9ca3af" stroke-width="1"/>',
        $padL, $xAxisY, $padL + $gw, $xAxisY
    );

    // Avg line — use float for exact horizontal position
    $avgY = $yAtF($avg);
    $svg .= sprintf(
        '<line x1="%d" y1="%.2f" x2="%d" y2="%.2f" stroke="#f59e0b" stroke-width="1.2" stroke-dasharray="5,3"/>',
        $padL, $avgY, $padL + $gw, $avgY
    );
    $svg .= sprintf(
        '<text x="%d" y="%.1f" font-size="8" fill="#d97706">avg %.0f</text>',
        $padL + $gw + 2, $avgY + 3, $avg
    );

    // Dots + polyline
    $pts = [];
    $dots = '';
    $xLabelStep = max(1, (int) ceil($n / 12));
    $xLabels = '';
    for ($i = 0; $i < $n; $i++) {
        $x = $xAt($i);
        $y = $yAt((int) $values[$i]);
        $pts[] = round($x, 1) . ',' . round($y, 1);

        $color = $values[$i] >= $avg ? '#2563eb' : '#93c5fd';
        $radius = $values[$i] >= $avg ? 3.5 : 2.8;
        $dots .= sprintf(
            '<circle cx="%.1f" cy="%.1f" r="%.1f" fill="%s"/>',
            $x, $y, $radius, $color
        );

        if ($i % $xLabelStep === 0 || $i === $n - 1) {
            $xLabels .= sprintf(
                '<text x="%.1f" y="%.1f" text-anchor="middle" font-size="7" fill="#6b7280">%s</text>',
                $x, $xAxisY + 12,
                htmlspecialchars($labels[$i], ENT_QUOTES, 'UTF-8')
            );
        }
    }

    $svg .= sprintf(
        '<polyline fill="none" stroke="#93c5fd" stroke-width="1" points="%s"/>',
        implode(' ', $pts)
    );
    $svg .= $dots;
    $svg .= $xLabels;

    // Legend
    $svg .= sprintf('<circle cx="%d" cy="%d" r="3.5" fill="#2563eb"/>', $padL + 4, $H - 16);
    $svg .= sprintf('<text x="%d" y="%d" font-size="9" fill="#111">≥ avg</text>', $padL + 12, $H - 12);
    $svg .= sprintf('<circle cx="%d" cy="%d" r="2.8" fill="#93c5fd"/>', $padL + 54, $H - 16);
    $svg .= sprintf('<text x="%d" y="%d" font-size="9" fill="#111">＜ avg</text>', $padL + 62, $H - 12);
    $svg .= sprintf('<line x1="%d" y1="%d" x2="%d" y2="%d" stroke="#f59e0b" stroke-width="1.2" stroke-dasharray="5,3"/>', $padL + 104, $H - 16, $padL + 120, $H - 16);
    $svg .= sprintf('<text x="%d" y="%d" font-size="9" fill="#d97706">daily avg</text>', $padL + 124, $H - 12);

    $svg .= '</svg>';
    return $svg;
};

$dotChartSvg = $totalDays > 0 ? $buildDotChartHtml($dotLabels, $dotValues, $totalDays, $cumulativeAvg) : '';

echo sprintf("## 老师组卷与学情分析（近%d个自然日）\n\n", $reportPeriodDays);
echo "> 生成 {$generatedAt} · {$tz} · 本 {$windowCur} · 上 {$windowPrev}\n";
echo sprintf("> 口径：自然日边界（config timezone）；今日段为当日 0:00—生成时刻；上周期为紧邻的前 **%d** 个完整自然日。\n\n", $reportPeriodDays);

echo "### 总量\n\n";
echo "| 指标 | 本周期 | 上周期 | 环比 |\n";
echo "| :---: | :---: | :---: | :---: |\n";
echo sprintf("| 组卷总套数 | %d | %d | %s |\n", $totalPapersCur, $totalPapersPrev, $wowLineHtml($totalPapersCur, $totalPapersPrev, $colorPapers));
echo sprintf("| 学情分析套数（卷去重） | %d | %d | %s |\n", $totalAnalysisCur, $totalAnalysisPrev, $wowLineHtml($totalAnalysisCur, $totalAnalysisPrev, $colorAnalysis));
echo sprintf("| 有组卷老师数 | %d | %d | %s |\n", $teachersCur, $teachersPrev, $wowLineHtml($teachersCur, $teachersPrev, $colorStudents));

echo "### 逐日对比（左：学案 · 右：学情）\n\n";
echo '<div class="weekly-chart">';
echo $chartSvg;
echo "</div>\n\n";

if ($dotChartSvg !== '') {
    echo sprintf("### 1月6日至今每日学案量（共 %d 天，累计 %d 套）\n\n", $totalDays, $cumulativeTotal);
    echo sprintf("> 日均 **%.1f** 套 · 峰值 **%d** 套（%s）\n\n", $cumulativeAvg, $cumulativeMax, $cumulativeMaxDate);
    echo '<div class="weekly-chart">';
    echo $dotChartSvg;
    echo "</div>\n\n";
}

// 老师列表汇总：先给出增/降总体倾向，再给出异常清单
$calcPct = static function (int $delta, int $prev): ?float {
    if ($prev <= 0) {
        return null;
    }
    return round(($delta / $prev) * 100, 1);
};

$fmtDeltaWithPct = static function (int $delta, int $prev): string {
    $sign = $delta > 0 ? '+' : '';
    $pct = $prev > 0 ? sprintf('（%s%.1f%%）', $sign, ($delta / $prev) * 100) : '（上0）';
    return $sign.$delta.$pct;
};

$paperUp = 0; $paperDown = 0; $paperFlat = 0;
$analysisUp = 0; $analysisDown = 0; $analysisFlat = 0;
$studentUp = 0; $studentDown = 0; $studentFlat = 0;
$sumPaperDelta = 0; $sumAnalysisDelta = 0; $sumStudentDelta = 0;
$anomalies = [];

foreach ($rows as $r) {
    $tidKey = (string) $r['teacher_id'];
    $name = (string) $r['name'];
    $papersCur = (int) $r['papers'];
    $papersPrev = (int) $r['papers_prev'];
    $analysisCur = (int) $r['analysis_sets'];
    $analysisPrev = (int) $r['analysis_sets_prev'];
    $studentCur = (int) ($studentUnionCurMap[$tidKey] ?? 0);
    $studentPrev = (int) ($studentUnionPrevMap[$tidKey] ?? 0);

    $paperDelta = $papersCur - $papersPrev;
    $analysisDelta = $analysisCur - $analysisPrev;
    $studentDelta = $studentCur - $studentPrev;
    $sumPaperDelta += $paperDelta;
    $sumAnalysisDelta += $analysisDelta;
    $sumStudentDelta += $studentDelta;

    if ($paperDelta > 0) { $paperUp++; } elseif ($paperDelta < 0) { $paperDown++; } else { $paperFlat++; }
    if ($analysisDelta > 0) { $analysisUp++; } elseif ($analysisDelta < 0) { $analysisDown++; } else { $analysisFlat++; }
    if ($studentDelta > 0) { $studentUp++; } elseif ($studentDelta < 0) { $studentDown++; } else { $studentFlat++; }

    $paperPct = $calcPct($paperDelta, $papersPrev);
    $analysisPct = $calcPct($analysisDelta, $analysisPrev);
    $studentPct = $calcPct($studentDelta, $studentPrev);

    // 异常口径（用于快速巡检）：
    // 1) 学案/学情明显下滑；2) 学案有量但学情为 0；3) 学情明显高于学案；
    // 4) 学案与学情方向背离；5) 覆盖学生数异常波动。
    if (
        ($papersPrev >= 20 && ($paperDelta <= -20 || ($paperPct !== null && $paperPct <= -50.0))) ||
        ($analysisPrev >= 15 && ($analysisDelta <= -15 || ($analysisPct !== null && $analysisPct <= -50.0))) ||
        ($papersCur >= 10 && $analysisCur === 0) ||
        ($analysisCur >= 10 && $analysisCur > $papersCur + 5) ||
        (($paperDelta > 0 && $analysisDelta < 0 && abs($analysisDelta) >= 5) ||
         ($paperDelta < 0 && $analysisDelta > 0 && abs($paperDelta) >= 5)) ||
        (abs($studentDelta) >= 10 || ($studentPct !== null && abs($studentPct) >= 100.0 && $studentPrev >= 5))
    ) {
        $severity = abs($paperDelta) + abs($analysisDelta) + abs($studentDelta);
        if ($papersCur >= 10 && $analysisCur === 0) { $severity += 20; }
        if ($analysisCur >= 10 && $analysisCur > $papersCur + 5) { $severity += 12; }

        $reason = [];
        if ($papersPrev >= 20 && ($paperDelta <= -20 || ($paperPct !== null && $paperPct <= -50.0))) { $reason[] = '学案下滑'; }
        if ($analysisPrev >= 15 && ($analysisDelta <= -15 || ($analysisPct !== null && $analysisPct <= -50.0))) { $reason[] = '学情下滑'; }
        if ($papersCur >= 10 && $analysisCur === 0) { $reason[] = '学案有量但学情为0'; }
        if ($analysisCur >= 10 && $analysisCur > $papersCur + 5) { $reason[] = '学情高于学案'; }
        if (($paperDelta > 0 && $analysisDelta < 0) || ($paperDelta < 0 && $analysisDelta > 0)) { $reason[] = '学案学情背离'; }
        if (abs($studentDelta) >= 10 || ($studentPct !== null && abs($studentPct) >= 100.0 && $studentPrev >= 5)) { $reason[] = '学生覆盖波动'; }

        $anomalies[] = [
            'severity' => $severity,
            'teacher_id' => $tidKey,
            'name' => $name,
            'papers_cur' => $papersCur,
            'papers_prev' => $papersPrev,
            'analysis_cur' => $analysisCur,
            'analysis_prev' => $analysisPrev,
            'student_cur' => $studentCur,
            'student_prev' => $studentPrev,
            'paper_delta_text' => $fmtDeltaWithPct($paperDelta, $papersPrev),
            'analysis_delta_text' => $fmtDeltaWithPct($analysisDelta, $analysisPrev),
            'student_delta_text' => $fmtDeltaWithPct($studentDelta, $studentPrev),
            'reason' => implode(' / ', array_values(array_unique($reason))),
        ];
    }
}

usort($anomalies, static fn ($a, $b) => $b['severity'] <=> $a['severity']);

$paperTrend = $paperUp > $paperDown ? '学案整体偏增长' : ($paperUp < $paperDown ? '学案整体偏下降' : '学案整体增降持平');
$analysisTrend = $analysisUp > $analysisDown ? '学情整体偏增长' : ($analysisUp < $analysisDown ? '学情整体偏下降' : '学情整体增降持平');
$studentTrend = $studentUp > $studentDown ? '学生覆盖整体偏增长' : ($studentUp < $studentDown ? '学生覆盖整体偏下降' : '学生覆盖整体增降持平');

echo "### 老师列表汇总（增降对比）\n\n";
echo "| 维度 | 增长老师数 | 下降老师数 | 持平老师数 | 判断 |\n";
echo "| :--- | ---: | ---: | ---: | :--- |\n";
echo sprintf("| 学案（组卷） | %d | %d | %d | %s |\n", $paperUp, $paperDown, $paperFlat, $paperTrend);
echo sprintf("| 学情（分析） | %d | %d | %d | %s |\n", $analysisUp, $analysisDown, $analysisFlat, $analysisTrend);
echo sprintf("| 学生覆盖（去重） | %d | %d | %d | %s |\n\n", $studentUp, $studentDown, $studentFlat, $studentTrend);

echo "### 异常数据（学案本/上超过100，文字清单）\n\n";
$highVolumeAnomalies = array_values(array_filter(
    $anomalies,
    static fn (array $a): bool => ((int) ($a['papers_cur'] ?? 0) > 100) || ((int) ($a['papers_prev'] ?? 0) > 100)
));
if ($highVolumeAnomalies === []) {
    echo "本周期未命中“学案本/上超过100”的异常老师。\n\n";
} else {
    $display = array_slice($highVolumeAnomalies, 0, 30);
    $idx = 1;
    foreach ($display as $a) {
        $nameEsc = htmlspecialchars((string) $a['name'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
        $tidEsc = htmlspecialchars((string) $a['teacher_id'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
        $reasonEsc = htmlspecialchars((string) $a['reason'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
        $line = sprintf(
            '%d) %s（%s）：学案 %d/%d（%s）；学情 %d/%d（%s）；学生 %d/%d（%s）；异常：%s',
            $idx++,
            $nameEsc,
            $tidEsc,
            (int) $a['papers_cur'],
            (int) $a['papers_prev'],
            (string) $a['paper_delta_text'],
            (int) $a['analysis_cur'],
            (int) $a['analysis_prev'],
            (string) $a['analysis_delta_text'],
            (int) $a['student_cur'],
            (int) $a['student_prev'],
            (string) $a['student_delta_text'],
            $reasonEsc
        );
        echo '- '.$line."\n";
    }
    if (count($highVolumeAnomalies) > 30) {
        echo sprintf("\n> 仅展示前 30 条，共 %d 条。\n", count($highVolumeAnomalies));
    }
    echo "\n";
}

echo sprintf("### 按老师　本周期有组卷 **%d** 人。\n\n", count($rows));

echo '<table class="weekly-teacher-table">';
echo '<colgroup>';
echo '<col style="width:3%" /><col class="col-name" style="width:18mm;max-width:18mm;" />';
echo '<col class="col-slash" style="width:11%" /><col style="width:14%" />';
echo '<col class="col-slash" style="width:11%" /><col style="width:14%" />';
echo '<col class="col-slash" style="width:11%" />';
echo '</colgroup>';
echo '<thead><tr>';
echo '<th>排名</th><th>老师</th><th>学案数量</th><th>学案·环比</th><th>分析数量</th><th>学情·环比</th><th>学生数</th>';
echo "</tr></thead>\n<tbody>\n";

$i = 1;
foreach ($rows as $r) {
    $tidKey = (string) $r['teacher_id'];
    $nmRaw = (string) $r['name'];
    $nmEsc = htmlspecialchars($nmRaw, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
    $tidEsc = htmlspecialchars($tidKey, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
    $nameWithId = $nmEsc.' <span class="teacher-id">('.$tidEsc.')</span>';
    $pc = $r['papers'];
    $pp = $r['papers_prev'];
    $ac = $r['analysis_sets'];
    $ap = $r['analysis_sets_prev'];
    $stuC = (int) ($studentUnionCurMap[$tidKey] ?? 0);
    $stuP = (int) ($studentUnionPrevMap[$tidKey] ?? 0);
    echo '<tr>';
    echo '<td>'.((string) $i++).'</td>';
    echo '<td class="td-name">'.$nameWithId.'</td>';
    echo '<td class="td-slash td-slash-papers" title="本周期 / 上周期：组卷套数">'.$slashPairAccentHtml($pc, $pp, $colorPapers).'</td>';
    echo '<td class="td-wow-papers">'.$compareCellHtml($pc, $pp, $colorPapers).'</td>';
    echo '<td class="td-slash td-slash-analysis" title="本周期 / 上周期：学情分析套数（卷去重）">'.$slashPairAccentHtml($ac, $ap, $colorAnalysis).'</td>';
    echo '<td class="td-wow-analysis">'.$compareCellHtml($ac, $ap, $colorAnalysis).'</td>';
    echo '<td class="td-slash td-slash-stu td-stu" title="本周期 / 上周期：组卷∪学情学生合并去重">'.$slashPairAccentHtml($stuC, $stuP, $colorStudents).'</td>';
    echo "</tr>\n";
}
echo "</tbody></table>\n";