$ErrorActionPreference = "Stop"

$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
$layoutRoot = Join-Path $repoRoot "app/src/main/res/layout"
$valuesRoot = Join-Path $repoRoot "app/src/main/res/values"
$themesPath = Join-Path $valuesRoot "themes.xml"
$failures = New-Object System.Collections.Generic.List[string]

function Add-Failure([string] $message) {
    $failures.Add($message) | Out-Null
}

function Get-XmlLine([string] $content, [int] $index) {
    if ($index -lt 0) {
        return 1
    }

    return (($content.Substring(0, $index) -split "`n").Count)
}

function Get-AttributeValue([string] $block, [string] $attributeName) {
    $escapedName = [regex]::Escape($attributeName)
    $match = [regex]::Match($block, "$escapedName=""([^""]+)""")
    if ($match.Success) {
        return $match.Groups[1].Value
    }

    return $null
}

function Assert-MinDp([string] $value, [int] $minimum, [string] $where, [string] $attributeName) {
    if ([string]::IsNullOrWhiteSpace($value)) {
        Add-Failure "$where is missing $attributeName"
        return
    }

    if ($value -notmatch "^([0-9]+)dp$") {
        Add-Failure "$where has non-fixed $attributeName='$value'"
        return
    }

    $actual = [int] $Matches[1]
    if ($actual -lt $minimum) {
        Add-Failure "$where has $attributeName=${actual}dp, expected at least ${minimum}dp"
    }
}

$xmlFiles = Get-ChildItem -Path @($layoutRoot, $valuesRoot) -Filter "*.xml" -Recurse
foreach ($file in $xmlFiles) {
    $content = Get-Content $file.FullName -Raw -Encoding UTF8
    $relativePath = Resolve-Path -Relative $file.FullName

    $textSizeDpMatches = [regex]::Matches($content, 'android:textSize="[0-9.]+dp"')
    foreach ($match in $textSizeDpMatches) {
        $line = Get-XmlLine $content $match.Index
        Add-Failure "${relativePath}:$line uses dp for textSize; use sp"
    }

    $materialButtons = [regex]::Matches($content, '(?s)<com\.google\.android\.material\.button\.MaterialButton\b.*?/>')
    foreach ($match in $materialButtons) {
        $line = Get-XmlLine $content $match.Index
        $where = "${relativePath}:$line MaterialButton"
        $block = $match.Value

        if ($block -match 'android:minWidth="0dp"') {
            Add-Failure "$where resets minWidth to 0dp"
        }

        $minHeight = Get-AttributeValue $block "android:minHeight"
        if (-not [string]::IsNullOrWhiteSpace($minHeight)) {
            Assert-MinDp $minHeight 48 $where "android:minHeight"
        }
    }

    $imageButtons = [regex]::Matches($content, '(?s)<ImageButton\b.*?/>')
    foreach ($match in $imageButtons) {
        $line = Get-XmlLine $content $match.Index
        $where = "${relativePath}:$line ImageButton"
        $block = $match.Value

        Assert-MinDp (Get-AttributeValue $block "android:layout_width") 48 $where "android:layout_width"
        Assert-MinDp (Get-AttributeValue $block "android:layout_height") 48 $where "android:layout_height"
    }
}

$themesContent = Get-Content $themesPath -Raw -Encoding UTF8
foreach ($styleName in @("Primary", "Secondary", "Tonal")) {
    $stylePattern = "(?s)<style\s+name=""Widget\.Aletheia\.Button\.$styleName"".*?</style>"
    $styleMatch = [regex]::Match($themesContent, $stylePattern)
    if (-not $styleMatch.Success) {
        Add-Failure "themes.xml is missing Widget.Aletheia.Button.$styleName"
        continue
    }

    $heightMatch = [regex]::Match($styleMatch.Value, '<item\s+name="android:minHeight">([0-9]+)dp</item>')
    if (-not $heightMatch.Success) {
        Add-Failure "Widget.Aletheia.Button.$styleName is missing android:minHeight"
        continue
    }

    $height = [int] $heightMatch.Groups[1].Value
    if ($height -lt 48) {
        Add-Failure "Widget.Aletheia.Button.$styleName has android:minHeight=${height}dp, expected at least 48dp"
    }
}

if ($failures.Count -gt 0) {
    Write-Error ("Accessibility layout smoke test failed:`n" + ($failures -join "`n"))
}

Write-Host "Accessibility layout smoke test passed."