From 9ab322751a732d8cbc1ddf4f2ecf5022d7242baa Mon Sep 17 00:00:00 2001
From: Marijn Besseling <njirambem@gmail.com>
Date: Sun, 7 Sep 2025 20:56:09 +0200
Subject: WIP migration

---
 Blog/Components/Pages/Letterflixd.razor.js | 99 ++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 Blog/Components/Pages/Letterflixd.razor.js

(limited to 'Blog/Components/Pages/Letterflixd.razor.js')

diff --git a/Blog/Components/Pages/Letterflixd.razor.js b/Blog/Components/Pages/Letterflixd.razor.js
new file mode 100644
index 0000000..a3903e2
--- /dev/null
+++ b/Blog/Components/Pages/Letterflixd.razor.js
@@ -0,0 +1,99 @@
+import { getById, resetLog, writeError, writeInfo, writeDebug, a, span, div, addClass } from "/common.module.js"
+
+let netflix_file_input = undefined;
+
+export function onLoad() {
+
+    const form = getById("form");
+    netflix_file_input = getById("netflix-file");
+
+    form.addEventListener("submit", submitForm);
+}
+
+
+/** @param {SubmitEvent} event */
+function submitForm(event) {
+    event.preventDefault();
+    event.stopPropagation();
+
+    resetLog();
+    const files = netflix_file_input.files;
+    if (files.length !== 1) {
+        writeError("First select your viewing history file.");
+        return;
+    }
+
+    const netflix_file = files[0];
+
+    writeInfo("Checking metadata...");
+
+    if (!netflix_file.type.match('text/csv')) {
+        let detected_filetype = "";
+        if (netflix_file.type) {
+            detected_filetype = ", detected filetype: " + netflix_file.type;
+        }
+        writeError("Select a CSV file" + detected_filetype);
+        return;
+    }
+
+    handleFile(netflix_file);
+}
+
+/** @param {File} file  */
+function handleFile(file) {
+    writeInfo("Reading file...");
+    file.text()
+        .then(convertText);
+}
+
+const viewingHistoryPattern = /"(.*)","(\d{1,2})\/(\d{1,2})\/(\d+)"/;
+
+/** @param {string} data  */
+function convertText(data) {
+    writeInfo("Checking header...");
+    const [header, ...lines] = data.split(/\r?\n|\r|\n/g);
+    if (header !== "Title,Date") {
+        writeError("Invalid Netflix viewing history file, expected header \"Title,Date\"");
+        return;
+    }
+    writeInfo("History count: " + lines.length);
+    let letterboxd_output = "Title,WatchedDate,Rewatch\n";
+    let watched_movies = new Set();
+
+    for (let line of lines) {
+        if (!line) continue;
+        if (line.includes(": Season")
+            || line.includes(": Limited Series:")
+            || line.includes(": Part")
+            || line.includes(": Chapter ")
+            || line.includes(": Volume ")
+            || line.includes(": Series ")
+            || line.includes(": Book ")) {
+            writeDebug("Skipping show episode: " + line);
+            continue;
+        }
+        if (line.startsWith(": ")) {
+            writeDebug("Skipping empty title entry")
+        }
+        const [_, title, day, month, year] = viewingHistoryPattern.exec(line);
+        if (title && day && month && year) {
+            const rewatch = watched_movies.has(title);
+            letterboxd_output += `"${title}",${year}-${month}-${day},${rewatch}\n`
+            if (rewatch) {
+                writeDebug("Rewatch of: " + title);
+            }
+            watched_movies.add(title);
+        }
+        else {
+            writeError("could not parse line: " + line);
+        }
+    }
+
+    let letterboxd_import = new Blob([letterboxd_output], { type: 'text/csv' });
+    
+    const filename = "netflix-letterboxd-import.csv"
+    let download_button = a(window.URL.createObjectURL(letterboxd_import), filename)
+    let download_text = span("Download import file ==> ")
+    download_button.download = filename;
+    log.appendChild(div(addClass(download_text, "info"), download_button));
+}
\ No newline at end of file
-- 
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