From 0363a6a4d41ece736da473e60c33e458b83e197d Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Fri, 22 Apr 2016 16:20:29 +0200
Subject: [PATCH] Add Diary type

---
 libimagdiary/src/diary.rs | 103 ++++++++++++++++++++++++++++++++++++++
 libimagdiary/src/lib.rs   |   1 +
 2 files changed, 104 insertions(+)
 create mode 100644 libimagdiary/src/diary.rs

diff --git a/libimagdiary/src/diary.rs b/libimagdiary/src/diary.rs
new file mode 100644
index 00000000..edd58c87
--- /dev/null
+++ b/libimagdiary/src/diary.rs
@@ -0,0 +1,103 @@
+use std::cmp::Ordering;
+
+use libimagstore::store::Store;
+use libimagstore::storeid::IntoStoreId;
+
+use chrono::offset::local::Local;
+use chrono::Datelike;
+use itertools::Itertools;
+
+use entry::Entry;
+use diaryid::DiaryId;
+use error::DiaryError as DE;
+use error::DiaryErrorKind as DEK;
+use result::Result;
+use iter::DiaryEntryIterator;
+use is_in_diary::IsInDiary;
+
+#[derive(Debug)]
+pub struct Diary<'a> {
+    store: &'a Store,
+    name: &'a str,
+}
+
+impl<'a> Diary<'a> {
+
+    pub fn open(store: &'a Store, name: &'a str) -> Diary<'a> {
+        Diary {
+            store: store,
+            name: name,
+        }
+    }
+
+    // create or get a new entry for today
+    pub fn new_entry_today(&self) -> Result<Entry> {
+        let dt = Local::now();
+        let ndt = dt.naive_local();
+
+        // Currenty we only have support for per-day entries
+        let id = DiaryId::new(String::from(self.name), ndt.year(), ndt.month(), ndt.day(), 0, 0);
+
+        self.retrieve(id)
+    }
+
+    pub fn retrieve(&self, id: DiaryId) -> Result<Entry> {
+        self.store
+            .retrieve(id.into_storeid())
+            .map(|fle| Entry::new(fle))
+            .map_err(|e| DE::new(DEK::StoreWriteError, Some(Box::new(e))))
+    }
+
+    // Get an iterator for iterating over all entries
+    pub fn entries(&self) -> Result<DiaryEntryIterator<'a>> {
+        self.store
+            .retrieve_for_module("diary")
+            .map(|iter| DiaryEntryIterator::new(self.name, self.store, iter))
+            .map_err(|e| DE::new(DEK::StoreReadError, Some(Box::new(e))))
+    }
+
+    pub fn delete_entry(&self, entry: Entry) -> Result<()> {
+        if !entry.is_in_diary(self.name) {
+            return Err(DE::new(DEK::EntryNotInDiary, None));
+        }
+        let id = entry.get_location().clone();
+        drop(entry);
+
+        self.store.delete(id)
+            .map_err(|e| DE::new(DEK::StoreWriteError, Some(Box::new(e))))
+    }
+
+    pub fn get_youngest_entry(&self) -> Option<Result<Entry>> {
+        match self.entries() {
+            Err(e) => Some(Err(e)),
+            Ok(entries) => {
+                entries.sorted_by(|a, b| {
+                    match (a, b) {
+                        (&Ok(ref a), &Ok(ref b)) => {
+                            let a : NaiveDateTime = a.diary_id().into();
+                            let b : NaiveDateTime = b.diary_id().into();
+
+                            a.cmp(&b)
+                        },
+
+                        (&Ok(_), &Err(ref e))  => {
+                            trace_error(e);
+                            Ordering::Less
+                        },
+                        (&Err(ref e), &Ok(_))  => {
+                            trace_error(e);
+                            Ordering::Greater
+                        },
+                        (&Err(ref e1), &Err(ref e2)) => {
+                            trace_error(e1);
+                            trace_error(e2);
+                            Ordering::Equal
+                        },
+                    }
+                }).into_iter().next()
+            }
+        }
+    }
+
+}
+
diff --git a/libimagdiary/src/lib.rs b/libimagdiary/src/lib.rs
index 25d0ec04..5f4567e7 100644
--- a/libimagdiary/src/lib.rs
+++ b/libimagdiary/src/lib.rs
@@ -15,6 +15,7 @@ module_entry_path_mod!("diary", "0.1.0");
 
 pub mod error;
 pub mod diaryid;
+pub mod diary;
 pub mod is_in_diary;
 pub mod entry;
 pub mod iter;