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| 1 | +/* |
| 2 | + * Copyright 2026 Mifos Initiative |
| 3 | + * |
| 4 | + * This Source Code Form is subject to the terms of the Mozilla Public |
| 5 | + * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 6 | + * file, You can obtain one at https://mozilla.org/MPL/2.0/. |
| 7 | + * |
| 8 | + * See https://github.com/openMF/mifos-x-field-officer-app/blob/master/LICENSE.md |
| 9 | + */ |
| 10 | +package com.mifos.core.ui.util.pdf |
| 11 | + |
| 12 | +import android.content.Context |
| 13 | +import android.print.PrintAttributes |
| 14 | +import android.print.PrintManager |
| 15 | +import android.webkit.WebView |
| 16 | +import android.webkit.WebViewClient |
| 17 | +import androidx.core.content.getSystemService |
| 18 | +import kotlinx.coroutines.Dispatchers |
| 19 | +import kotlinx.coroutines.suspendCancellableCoroutine |
| 20 | +import kotlinx.coroutines.withContext |
| 21 | +import kotlin.coroutines.resume |
| 22 | +import kotlin.coroutines.resumeWithException |
| 23 | + |
| 24 | +/** |
| 25 | + * Android implementation of PDF generator using WebView print adapter. |
| 26 | + */ |
| 27 | +actual class PdfGenerator { |
| 28 | + |
| 29 | + private var context: Context? = null |
| 30 | + |
| 31 | + fun setContext(context: Context) { |
| 32 | + this.context = context |
| 33 | + } |
| 34 | + |
| 35 | + actual suspend fun generateAndSharePdf( |
| 36 | + htmlContent: String, |
| 37 | + fileName: String, |
| 38 | + pageConfig: PageConfig, |
| 39 | + ) { |
| 40 | + withContext(Dispatchers.Main) { |
| 41 | + val appContext = context ?: throw Exception("Context not initialized") |
| 42 | + |
| 43 | + val finalHtml = run { |
| 44 | + val orientation = if (pageConfig.orientation == Orientation.LANDSCAPE) { |
| 45 | + "landscape" |
| 46 | + } else { |
| 47 | + "portrait" |
| 48 | + } |
| 49 | + val size = when (pageConfig.size) { |
| 50 | + PageSize.A4 -> "A4" |
| 51 | + PageSize.LETTER -> "letter" |
| 52 | + } |
| 53 | + val pageCss = |
| 54 | + "@page { size: $size $orientation; margin: ${pageConfig.marginMm}mm; }" |
| 55 | + htmlContent.replace("/* PAGE_CONFIG_PLACEHOLDER */", pageCss) |
| 56 | + } |
| 57 | + |
| 58 | + var webView: WebView? = WebView(appContext) |
| 59 | + |
| 60 | + try { |
| 61 | + suspendCancellableCoroutine { continuation -> |
| 62 | + val currentWebView = webView ?: return@suspendCancellableCoroutine |
| 63 | + |
| 64 | + continuation.invokeOnCancellation { |
| 65 | + currentWebView.stopLoading() |
| 66 | + currentWebView.destroy() |
| 67 | + webView = null |
| 68 | + } |
| 69 | + |
| 70 | + currentWebView.settings.javaScriptEnabled = false |
| 71 | + currentWebView.webViewClient = object : WebViewClient() { |
| 72 | + override fun onPageFinished(view: WebView?, url: String?) { |
| 73 | + try { |
| 74 | + val printManager = appContext.getSystemService<PrintManager>() |
| 75 | + ?: throw Exception("PrintManager not available") |
| 76 | + |
| 77 | + val attributes = createPrintAttributes(pageConfig) |
| 78 | + val nativeAdapter = view?.createPrintDocumentAdapter(fileName) |
| 79 | + ?: throw Exception("PrintDocumentAdapter is null") |
| 80 | + |
| 81 | + printManager.print(fileName, nativeAdapter, attributes) |
| 82 | + |
| 83 | + if (continuation.isActive) continuation.resume(Unit) |
| 84 | + } catch (e: Exception) { |
| 85 | + if (continuation.isActive) continuation.resumeWithException(e) |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + override fun onReceivedError( |
| 90 | + view: WebView?, |
| 91 | + errorCode: Int, |
| 92 | + description: String?, |
| 93 | + failingUrl: String?, |
| 94 | + ) { |
| 95 | + if (continuation.isActive) { |
| 96 | + continuation.resumeWithException(Exception("WebView Error: $description")) |
| 97 | + } |
| 98 | + } |
| 99 | + } |
| 100 | + |
| 101 | + currentWebView.loadDataWithBaseURL(null, finalHtml, "text/html", "UTF-8", null) |
| 102 | + } |
| 103 | + } finally { |
| 104 | + // If webView wasn't nulled by cancellation, clean it up now |
| 105 | + webView?.let { activeView -> |
| 106 | + activeView.post { |
| 107 | + activeView.stopLoading() |
| 108 | + activeView.destroy() |
| 109 | + } |
| 110 | + webView = null |
| 111 | + } |
| 112 | + } |
| 113 | + } |
| 114 | + } |
| 115 | + |
| 116 | + private fun createPrintAttributes(pageConfig: PageConfig): PrintAttributes { |
| 117 | + val isLandscape = pageConfig.orientation == Orientation.LANDSCAPE |
| 118 | + val mediaSize = when (pageConfig.size) { |
| 119 | + PageSize.A4 -> if (isLandscape) { |
| 120 | + PrintAttributes.MediaSize.ISO_A4.asLandscape() |
| 121 | + } else { |
| 122 | + PrintAttributes.MediaSize.ISO_A4 |
| 123 | + } |
| 124 | + |
| 125 | + PageSize.LETTER -> if (isLandscape) { |
| 126 | + PrintAttributes.MediaSize.NA_LETTER.asLandscape() |
| 127 | + } else { |
| 128 | + PrintAttributes.MediaSize.NA_LETTER |
| 129 | + } |
| 130 | + } |
| 131 | + val marginMils = (pageConfig.marginMm * 39.3701).toInt() |
| 132 | + |
| 133 | + return PrintAttributes.Builder() |
| 134 | + .setMediaSize(mediaSize) |
| 135 | + .setColorMode(PrintAttributes.COLOR_MODE_COLOR) |
| 136 | + .setMinMargins( |
| 137 | + PrintAttributes.Margins( |
| 138 | + marginMils, |
| 139 | + marginMils, |
| 140 | + marginMils, |
| 141 | + marginMils, |
| 142 | + ), |
| 143 | + ) |
| 144 | + .build() |
| 145 | + } |
| 146 | +} |
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