From 73b4ff84b7b131c0f41b0276c3700c0afd43c446 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 17 Feb 2017 19:32:52 +0530
Subject: [PATCH] Start work on currently reading section of home page

---
 src/pyj/book_list/home.pyj |  9 +++++++++
 src/pyj/read_book/db.pyj   | 34 +++++++++++++++++++++++++++-------
 src/pyj/read_book/ui.pyj   |  2 +-
 3 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/src/pyj/book_list/home.pyj b/src/pyj/book_list/home.pyj
index 2f3a7abf35..c1ae1dc291 100644
--- a/src/pyj/book_list/home.pyj
+++ b/src/pyj/book_list/home.pyj
@@ -14,12 +14,21 @@ from book_list.ui import set_default_panel_handler, show_panel
 from book_list.router import update_window_title
 
 
+def show_recent_stage2(books):
+    container = document.getElementById(this)
+    if not container:
+        return
+    for book in books:
+        print(book.key, book.metadata.title, book.last_read)
+
+
 def show_recent():
     container = this
     db = get_db()
     if not db.initialized:
         conditional_timeout(container.id, 5, show_recent)
         return
+    db.get_recently_read_books(show_recent_stage2.bind(container.id))
 
 
 def init(container_id):
diff --git a/src/pyj/read_book/db.pyj b/src/pyj/read_book/db.pyj
index 6901a8f991..5fe9b88614 100644
--- a/src/pyj/read_book/db.pyj
+++ b/src/pyj/read_book/db.pyj
@@ -6,12 +6,10 @@ from gettext import gettext as _
 from encodings import base64encode, base64decode
 from modals import error_dialog
 
-from book_list.library_data import current_library_id
 from book_list.router import is_reading_book
 
-current_library_id
 
-def upgrade_schema(idb, old_version, new_version):
+def upgrade_schema(idb, old_version, new_version, transaction):
     print('upgrade_schema:', old_version, new_version)
     if not idb.objectStoreNames.contains('books'):
         idb.createObjectStore('books', {'keyPath':'key'})
@@ -22,6 +20,11 @@ def upgrade_schema(idb, old_version, new_version):
     if not idb.objectStoreNames.contains('objects'):
         idb.createObjectStore('objects', {'keyPath':'key'})
 
+    # Create indices
+    books_store = transaction.objectStore('books')
+    if not books_store.indexNames.contains('last_read_index'):
+        books_store.createIndex('last_read_index', 'last_read')
+
 def file_store_name(book, name):
     return book.book_hash + ' ' + name
 
@@ -33,7 +36,7 @@ def get_error_details(event):
         desc = desc.errorCode
 
 DB_NAME = 'calibre-books-db-testing'  # TODO: Remove test suffix and change version back to 1
-DB_VERSION = 2
+DB_VERSION = 3
 
 class DB:
 
@@ -60,7 +63,7 @@ class DB:
         request = window.indexedDB.open(DB_NAME, DB_VERSION)
 
         request.onupgradeneeded = def(event):
-            upgrade_schema(event.target.result, event.oldVersion, event.newVersion)
+            upgrade_schema(event.target.result, event.oldVersion, event.newVersion, event.target.transaction)
 
         request.onblocked = def(event):
             self.initialize_error_msg = _('Please close all other browser tabs with calibre open')
@@ -126,12 +129,12 @@ class DB:
         req.onerror = def(event):
             self.display_error(error_msg, event)
 
-    def get_book(self, book_id, fmt, metadata, proceed):
+    def get_book(self, library_id, book_id, fmt, metadata, proceed):
         fmt = fmt.toUpperCase()
         # The key has to be a JavaScript array as otherwise it cannot be stored
         # into indexed db, because the RapydScript list has properties that
         # refer to non-serializable objects like functions.
-        key = v'[current_library_id(), book_id, fmt]'
+        key = v'[library_id, book_id, fmt]'
         self.do_op(['books'], key, _('Failed to read from the books database'), def(result):
             proceed(result or {
                 'key':key,
@@ -262,6 +265,23 @@ class DB:
             else:
                 proceed(data)
 
+    def get_recently_read_books(self, proceed, limit):
+        limit = limit or 3
+        c = self.idb.transaction(['books'], 'readonly').objectStore('books').index('last_read_index').openCursor(None, 'prev')
+        books = v'[]'
+        c.onerror = def(event):
+            err = _('Failed to read recent books from local storage')
+            self.display_error(err, event)
+        c.onsuccess = def (ev):
+            cursor = ev.target.result
+            if cursor:
+                books.push(cursor.value)
+            if books.length >= limit or not cursor:
+                proceed(books)
+                return
+            if cursor:
+                cursor.continue()
+
     def delete_book(self, book, proceed):
         c = self.idb.transaction(['books', 'files'], 'readwrite')
         files = c.objectStore('files')
diff --git a/src/pyj/read_book/ui.pyj b/src/pyj/read_book/ui.pyj
index a1cf258baa..3c094a003d 100644
--- a/src/pyj/read_book/ui.pyj
+++ b/src/pyj/read_book/ui.pyj
@@ -145,7 +145,7 @@ class ReadUI:
         if jstype(self.db) is 'string':
             self.show_error(_('Cannot read book'), self.db)
             return
-        self.db.get_book(book_id, fmt, metadata, self.got_book.bind(self, force_reload))
+        self.db.get_book(current_library_id(), book_id, fmt, metadata, self.got_book.bind(self, force_reload))
 
     def got_book(self, force_reload, book):
         if not book.manifest or book.manifest.version is not RENDER_VERSION or not book.is_complete: