2 files changed, 48 insertions, 2 deletions

diff --git a/src/epub.rs b/src/epub.rs
index c984dde..90aeafb 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -1,3 +1,5 @@
+use anyhow::{Context, Result};
+use std::fs;
 use std::path::{Path, PathBuf};
 use unicode_normalization::UnicodeNormalization;
 
@@ -9,6 +11,7 @@ pub struct EpubSkeleton {
 }
 
 impl EpubSkeleton {
+    /// Plan the output directory structure using the sanitized title + bookid.
     pub fn plan(base_books_dir: &Path, title: &str, bookid: &str) -> Self {
         // Maximum number of bytes in a filename.
         const MAX_BYTES: usize = 255;
@@ -28,6 +31,38 @@ impl EpubSkeleton {
             root: root_dir,
         }
     }
+
+    /// Create the directories defined in the struct.
+    pub fn create_dirs(&self) -> Result<()> {
+        fs::create_dir_all(&self.oebps)
+            .with_context(|| format!("Creating directory {}", self.oebps.display()))?;
+        fs::create_dir_all(&self.meta_inf)
+            .with_context(|| format!("Creating directory {}", self.meta_inf.display()))?;
+        Ok(())
+    }
+
+    /// Write META-INF/container.xml pointing to OEBPS/content.opf.
+    pub fn write_container_xml(&self) -> Result<()> {
+        let path = self.meta_inf.join("container.xml");
+        let xml = r#"<?xml version="1.0" encoding="UTF-8"?>
+            <container xmlns="urn:oasis:names:tc:opendocument:xmlns:container" version="1.0">
+            <rootfiles>
+            <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>
+            </rootfiles>
+            </container>
+            "#;
+        fs::write(&path, xml).with_context(|| format!("Writing file {}", path.display()))?;
+        Ok(())
+    }
+
+    /// Write the plaintext "mimetype" file at the root (no newline).
+    pub fn write_mimetype(&self) -> Result<()> {
+        let path = self.root.join("mimetype");
+        // EXACT bytes required by OCF; do not add '\n'.
+        fs::write(&path, b"application/epub+zip")
+            .with_context(|| format!("Writing file {}", path.display()))?;
+        Ok(())
+    }
 }
 
 /// Sanitize a filename component for cross‑platform compatibility.
diff --git a/src/main.rs b/src/main.rs
index b963850..83743a7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,6 +10,7 @@ use clap::Parser;
 use cli::Args;
 use cookies::CookieStore;
 use display::Display;
+use epub::EpubSkeleton;
 use http_client::HttpClient;
 use orly::{check_login, fetch_book_info};
 
@@ -68,9 +69,19 @@ async fn main() {
     };
     ui.info(&format!("{:#?}", bookinfo));
 
-    let output_dir = config::books_root().join(format!("(pending) ({})", args.bookid));
+    let skeleton = EpubSkeleton::plan(&config::books_root(), &bookinfo.title, &args.bookid);
+    ui.set_output_dir(skeleton.root.clone());
 
-    ui.set_output_dir(output_dir);
+    // Create directories and required files
+    if let Err(e) = (|| -> anyhow::Result<()> {
+        skeleton.create_dirs()?;
+        skeleton.write_mimetype()?;
+        skeleton.write_container_xml()?;
+        Ok(())
+    })() {
+        ui.error_and_exit(&format!("EPUB skeleton creation failed: {e}"));
+    }
+    ui.info("EPUB skeleton ready (mimetype + META-INF/container.xml + OEBPS/).");
 
     ui.info("Initialization complete.");
     ui.info("No network operations performed in this version.");