Add-Type -AssemblyName System.Drawing

$desktop = [Environment]::GetFolderPath("Desktop")
$output = Join-Path $desktop "供应监测决策流程图.png"

$width = 3600
$height = 1850
$bmp = New-Object System.Drawing.Bitmap($width, $height)
$g = [System.Drawing.Graphics]::FromImage($bmp)
$g.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::AntiAlias
$g.TextRenderingHint = [System.Drawing.Text.TextRenderingHint]::ClearTypeGridFit
$g.Clear([System.Drawing.Color]::White)

$fontFamily = "Microsoft YaHei"
$font = New-Object System.Drawing.Font($fontFamily, 28, [System.Drawing.FontStyle]::Regular)
$boldFont = New-Object System.Drawing.Font($fontFamily, 30, [System.Drawing.FontStyle]::Bold)
$titleFont = New-Object System.Drawing.Font($fontFamily, 44, [System.Drawing.FontStyle]::Bold)
$labelFont = New-Object System.Drawing.Font($fontFamily, 24, [System.Drawing.FontStyle]::Bold)

$black = [System.Drawing.Color]::FromArgb(35, 35, 35)
$lineColor = [System.Drawing.Color]::FromArgb(72, 92, 120)
$blueFill = [System.Drawing.Color]::FromArgb(235, 244, 255)
$greenFill = [System.Drawing.Color]::FromArgb(235, 250, 241)
$yellowFill = [System.Drawing.Color]::FromArgb(255, 249, 225)
$redFill = [System.Drawing.Color]::FromArgb(255, 238, 238)
$grayFill = [System.Drawing.Color]::FromArgb(247, 249, 252)
$strokeBlue = [System.Drawing.Color]::FromArgb(69, 125, 197)
$strokeGreen = [System.Drawing.Color]::FromArgb(46, 140, 88)
$strokeYellow = [System.Drawing.Color]::FromArgb(196, 142, 35)
$strokeRed = [System.Drawing.Color]::FromArgb(196, 76, 76)
$strokeGray = [System.Drawing.Color]::FromArgb(130, 145, 165)

function New-Pen($color, $width) {
    $pen = New-Object System.Drawing.Pen($color, $width)
    $pen.StartCap = [System.Drawing.Drawing2D.LineCap]::Round
    $pen.EndCap = [System.Drawing.Drawing2D.LineCap]::Round
    return $pen
}

$linePen = New-Pen $lineColor 4
$arrowPen = New-Pen $lineColor 4
$arrowPen.CustomEndCap = New-Object System.Drawing.Drawing2D.AdjustableArrowCap(8, 8)

$textBrush = New-Object System.Drawing.SolidBrush($black)
$labelBrush = New-Object System.Drawing.SolidBrush([System.Drawing.Color]::FromArgb(55, 75, 100))

$sf = New-Object System.Drawing.StringFormat
$sf.Alignment = [System.Drawing.StringAlignment]::Center
$sf.LineAlignment = [System.Drawing.StringAlignment]::Center
$sf.FormatFlags = [System.Drawing.StringFormatFlags]::LineLimit

function Draw-RoundRect($graphics, $rect, $radius, $fill, $stroke) {
    $path = New-Object System.Drawing.Drawing2D.GraphicsPath
    $d = $radius * 2
    $path.AddArc($rect.X, $rect.Y, $d, $d, 180, 90)
    $path.AddArc($rect.Right - $d, $rect.Y, $d, $d, 270, 90)
    $path.AddArc($rect.Right - $d, $rect.Bottom - $d, $d, $d, 0, 90)
    $path.AddArc($rect.X, $rect.Bottom - $d, $d, $d, 90, 90)
    $path.CloseFigure()
    $graphics.FillPath((New-Object System.Drawing.SolidBrush($fill)), $path)
    $graphics.DrawPath((New-Object System.Drawing.Pen($stroke, 4)), $path)
}

function Draw-Node($id, $x, $y, $w, $h, $text, $fill, $stroke) {
    $rect = New-Object System.Drawing.RectangleF($x, $y, $w, $h)
    Draw-RoundRect $g $rect 22 $fill $stroke
    $inner = New-Object System.Drawing.RectangleF($x + 18, $y + 10, $w - 36, $h - 20)
    $g.DrawString($text, $font, $textBrush, $inner, $sf)
    $script:nodes[$id] = $rect
}

function Draw-Diamond($id, $x, $y, $w, $h, $text, $fill, $stroke) {
    $path = New-Object System.Drawing.Drawing2D.GraphicsPath
    $path.AddPolygon(@(
        (New-Object System.Drawing.PointF(($x + $w / 2), $y)),
        (New-Object System.Drawing.PointF(($x + $w), ($y + $h / 2))),
        (New-Object System.Drawing.PointF(($x + $w / 2), ($y + $h))),
        (New-Object System.Drawing.PointF($x, ($y + $h / 2)))
    ))
    $g.FillPath((New-Object System.Drawing.SolidBrush($fill)), $path)
    $g.DrawPath((New-Object System.Drawing.Pen($stroke, 4)), $path)
    $inner = New-Object System.Drawing.RectangleF($x + 40, $y + 18, $w - 80, $h - 36)
    $g.DrawString($text, $boldFont, $textBrush, $inner, $sf)
    $script:nodes[$id] = New-Object System.Drawing.RectangleF($x, $y, $w, $h)
}

function Center($rect) {
    return New-Object System.Drawing.PointF(($rect.X + $rect.Width / 2), ($rect.Y + $rect.Height / 2))
}

function EdgePoint($rect, $side) {
    switch ($side) {
        "L" { return New-Object System.Drawing.PointF($rect.X, ($rect.Y + $rect.Height / 2)) }
        "R" { return New-Object System.Drawing.PointF(($rect.X + $rect.Width), ($rect.Y + $rect.Height / 2)) }
        "T" { return New-Object System.Drawing.PointF(($rect.X + $rect.Width / 2), $rect.Y) }
        "B" { return New-Object System.Drawing.PointF(($rect.X + $rect.Width / 2), ($rect.Y + $rect.Height)) }
    }
}

function Draw-Arrow($from, $fromSide, $to, $toSide, $label = "") {
    $a = EdgePoint $nodes[$from] $fromSide
    $b = EdgePoint $nodes[$to] $toSide
    $g.DrawLine($arrowPen, $a, $b)
    if ($label -ne "") {
        $mx = ($a.X + $b.X) / 2
        $my = ($a.Y + $b.Y) / 2
        $labelRect = New-Object System.Drawing.RectangleF($mx - 42, $my - 32, 84, 44)
        $g.FillRectangle([System.Drawing.Brushes]::White, $labelRect)
        $g.DrawString($label, $labelFont, $labelBrush, $labelRect, $sf)
    }
}

function Draw-PolylineArrow($points, $label = "", $labelX = 0, $labelY = 0) {
    for ($i = 0; $i -lt $points.Count - 2; $i++) {
        $g.DrawLine($linePen, $points[$i], $points[$i + 1])
    }
    $g.DrawLine($arrowPen, $points[$points.Count - 2], $points[$points.Count - 1])
    if ($label -ne "") {
        $labelRect = New-Object System.Drawing.RectangleF($labelX - 42, $labelY - 32, 84, 44)
        $g.FillRectangle([System.Drawing.Brushes]::White, $labelRect)
        $g.DrawString($label, $labelFont, $labelBrush, $labelRect, $sf)
    }
}

$nodes = @{}

$titleRect = New-Object System.Drawing.RectangleF(0, 35, $width, 70)
$g.DrawString("供应监测补货决策流程", $titleFont, $textBrush, $titleRect, $sf)

Draw-Node "A" 80 735 500 180 "更新数据`n预测需求 / 现有库存 / 在途库存`n半成品库存 / 已下单未要求来货" $blueFill $strokeBlue
Draw-Node "B" 700 735 430 180 "核算现有可用量`n现有库存 + 半成品可组装量" $blueFill $strokeBlue
Draw-Diamond "C" 1240 680 380 290 "现有可用量`n是否覆盖需求?" $yellowFill $strokeYellow

Draw-Node "D" 1780 330 360 140 "现有库存可覆盖" $greenFill $strokeGreen
Draw-Diamond "E" 2300 285 360 230 "是否需要`n组装半成品?" $yellowFill $strokeYellow
Draw-Node "F" 2830 190 340 130 "无需来货 / 下单" $greenFill $strokeGreen
Draw-Node "G" 2830 420 340 150 "安排半成品组装`n转为成品库存" $greenFill $strokeGreen

Draw-Node "H" 1780 830 360 150 "现有可用量不足`n计算缺口" $redFill $strokeRed
Draw-Diamond "I" 2300 795 360 230 "在途库存`n是否覆盖缺口?" $yellowFill $strokeYellow
Draw-Node "J" 2830 710 340 150 "跟进在途到货`n更新到货计划" $greenFill $strokeGreen
Draw-Node "K" 2830 960 340 130 "在途后仍有缺口" $redFill $strokeRed

Draw-Diamond "L" 2300 1210 360 250 "已下单未要求来货`n是否覆盖缺口?" $yellowFill $strokeYellow
Draw-Node "M" 2830 1180 340 160 "安排来货`n通知供应商发货 / 到货" $greenFill $strokeGreen
Draw-Node "N" 1780 1275 360 160 "已下单量仍不足`n计算新增下单量" $redFill $strokeRed
Draw-Diamond "O" 1240 1225 380 230 "是否急需?" $yellowFill $strokeYellow
Draw-Node "P" 700 1125 430 150 "新增加急下单`n优先排产" $redFill $strokeRed
Draw-Node "Q" 700 1390 430 130 "新增常规下单" $grayFill $strokeGray

Draw-Node "S" 2830 610 340 130 "更新组装计划`n回写库存跟踪" $blueFill $strokeBlue
Draw-Node "T" 2830 890 340 130 "更新在途到货计划`n回写库存跟踪" $blueFill $strokeBlue
Draw-Node "U" 2830 1385 340 130 "更新来货计划`n回写库存跟踪" $blueFill $strokeBlue
Draw-Node "V" 700 1610 430 130 "更新下单计划`n回写库存跟踪" $blueFill $strokeBlue
Draw-Node "R" 1780 1610 420 130 "持续跟踪销售与库存" $greenFill $strokeGreen

Draw-Arrow "A" "R" "B" "L"
Draw-Arrow "B" "R" "C" "L"
Draw-Arrow "C" "R" "D" "L" "是"
Draw-Arrow "C" "R" "H" "L" "否"
Draw-Arrow "D" "R" "E" "L"
Draw-Arrow "E" "R" "F" "L" "否"
Draw-Arrow "E" "R" "G" "L" "是"
Draw-Arrow "H" "R" "I" "L"
Draw-Arrow "I" "R" "J" "L" "是"
Draw-Arrow "I" "R" "K" "L" "否"

Draw-PolylineArrow @((EdgePoint $nodes["K"] "B"), (New-Object System.Drawing.PointF(3000, 1130)), (New-Object System.Drawing.PointF(2480, 1130)), (EdgePoint $nodes["L"] "T"))
Draw-Arrow "L" "R" "M" "L" "是"
Draw-PolylineArrow @((EdgePoint $nodes["L"] "L"), (New-Object System.Drawing.PointF(2160, 1335)), (EdgePoint $nodes["N"] "R")) "否" 2200 1335
Draw-Arrow "N" "L" "O" "R"
Draw-Arrow "O" "L" "P" "R" "是"
Draw-PolylineArrow @((EdgePoint $nodes["O"] "B"), (New-Object System.Drawing.PointF(1430, 1455)), (EdgePoint $nodes["Q"] "R")) "否" 1300 1455

Draw-PolylineArrow @((EdgePoint $nodes["G"] "B"), (New-Object System.Drawing.PointF(3000, 595)), (EdgePoint $nodes["S"] "T"))
Draw-PolylineArrow @((EdgePoint $nodes["J"] "B"), (New-Object System.Drawing.PointF(3000, 875)), (EdgePoint $nodes["T"] "T"))
Draw-PolylineArrow @((EdgePoint $nodes["M"] "B"), (New-Object System.Drawing.PointF(3000, 1365)), (EdgePoint $nodes["U"] "T"))
Draw-Arrow "P" "B" "V" "T"
Draw-Arrow "Q" "B" "V" "T"

Draw-PolylineArrow @((EdgePoint $nodes["F"] "B"), (New-Object System.Drawing.PointF(3000, 1645)), (EdgePoint $nodes["R"] "R"))
Draw-PolylineArrow @((EdgePoint $nodes["S"] "B"), (New-Object System.Drawing.PointF(3000, 1665)), (EdgePoint $nodes["R"] "R"))
Draw-PolylineArrow @((EdgePoint $nodes["T"] "B"), (New-Object System.Drawing.PointF(3000, 1680)), (EdgePoint $nodes["R"] "R"))
Draw-PolylineArrow @((EdgePoint $nodes["U"] "B"), (New-Object System.Drawing.PointF(3000, 1700)), (EdgePoint $nodes["R"] "R"))
Draw-Arrow "V" "R" "R" "L"

$bmp.Save($output, [System.Drawing.Imaging.ImageFormat]::Png)
$g.Dispose()
$bmp.Dispose()

Write-Output $output