From 3803df72216e31af49d91e1c3f2bf64a155a2ead Mon Sep 17 00:00:00 2001
From: Daniel Flanagan <daniel@lyte.dev>
Date: Sat, 6 Jul 2024 09:43:07 -0500
Subject: [PATCH] Stuff

---
 Cargo.lock   |   5 +-
 Cargo.toml   |   1 +
 src/main.rs  |   1 +
 src/model.rs | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 131 insertions(+), 2 deletions(-)
 create mode 100644 src/model.rs

diff --git a/Cargo.lock b/Cargo.lock
index f790df1..087796a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1036,6 +1036,7 @@ dependencies = [
  "notify",
  "pathdiff",
  "redact",
+ "regex",
  "serde",
  "sled",
  "thiserror",
@@ -1512,9 +1513,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.10.4"
+version = "1.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
 dependencies = [
  "aho-corasick",
  "memchr",
diff --git a/Cargo.toml b/Cargo.toml
index c13b63d..f699073 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,6 +31,7 @@ maud = "0.26.0"
 notify = "6.1.1"
 pathdiff = "0.2.1"
 redact = { version = "0.1.10", features = ["serde"] }
+regex = { version = "1.10.5" }
 serde = "1.0.201"
 sled = { version = "0.34.7", features = [] }
 thiserror = "1.0.60"
diff --git a/src/main.rs b/src/main.rs
index 55f6ac3..e1e3493 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@ mod auth;
 mod cli;
 mod db;
 mod file_watcher;
+mod model;
 mod observe;
 mod partials;
 mod prelude;
diff --git a/src/model.rs b/src/model.rs
new file mode 100644
index 0000000..2c8f2c2
--- /dev/null
+++ b/src/model.rs
@@ -0,0 +1,126 @@
+mod song {
+    use std::{
+        collections::{BTreeMap, VecDeque},
+        str::FromStr,
+    };
+
+    use regex::Regex;
+
+    pub struct Verse {
+        // pub background: String, // url
+        pub content: String,
+    }
+
+    /// Sequence of verse names.
+    pub type SongMap = Vec<String>;
+
+    pub struct Song {
+        pub name: String,
+        pub verses: BTreeMap<String, Verse>,
+        pub other_maps: BTreeMap<String, SongMap>,
+        pub default_map: SongMap,
+    }
+
+    impl Song {
+        pub fn song_map(&self, map_name: Option<String>) -> &Vec<String> {
+            map_name
+                .map(|map_name| self.other_maps.get(&map_name).unwrap_or(&self.default_map))
+                .unwrap_or(&self.default_map)
+        }
+    }
+
+    #[derive(Debug)]
+    pub enum SongParseError {
+        EmptyString,
+    }
+
+    const REGEX_TWO_NEWLINES_WITH_ARBITRARY_SURROUNDING_WHITESPACE: &str = r"\s*[\n\r]\s*[\n\r]\s*";
+
+    impl FromStr for Song {
+        type Err = SongParseError;
+
+        fn from_str(s: &str) -> Result<Self, Self::Err> {
+            if s == "" {
+                return Err(SongParseError::EmptyString);
+            }
+
+            let re = Regex::new(REGEX_TWO_NEWLINES_WITH_ARBITRARY_SURROUNDING_WHITESPACE).unwrap();
+            let mut hunks = VecDeque::new();
+            let mut last_end: usize = 0;
+
+            for m in re.find_iter(s) {
+                hunks.push_back(&s[last_end..m.start()]);
+                last_end = m.end();
+            }
+            hunks.push_back(&s[last_end..s.len() - 1]);
+
+            // process header
+            let mut header_lines = hunks.pop_front().unwrap().lines();
+            let name = header_lines.next().unwrap().trim().to_owned();
+
+            for line in header_lines {
+                // map(band2): slide1, slide2
+                // band2: slide1, slide2
+            }
+
+            let mut verses = BTreeMap::new();
+
+            // process verses
+            for hunk in hunks {
+                let mut verse_contents = hunk;
+                let first_line = &hunk[0..hunk.find('\n').unwrap_or(hunk.len())];
+                let verse_name: String = if let Some(i) = first_line.find(':') {
+                    String::from(&first_line[0..i])
+                } else {
+                    format!("Generated Verse {}", verses.len()).to_owned()
+                };
+                verses.insert(verse_name, verse_content);
+            }
+
+            Ok(Self {
+                name,
+                verses,
+                other_maps: BTreeMap::new(),
+                default_map: vec![],
+            })
+        }
+    }
+
+    mod test {
+        use super::Song;
+
+        #[test]
+        fn parses_simple_song() {
+            let song: Song = r#"Song Title
+                
+                A verse"#
+                .parse()
+                .unwrap();
+
+            assert_eq!(song.name, "Song Title");
+            assert_eq!(song.verses.len(), 1);
+        }
+    }
+}
+
+mod display {
+    use super::song::{Song, SongMap};
+
+    pub struct PlaylistEntry {
+        pub song: Song,
+        pub map: SongMap,
+    }
+
+    pub struct PlaylistVerseRef {
+        pub song_index: usize,
+        pub song_map: String,
+        pub map_verse_index: usize,
+    }
+
+    pub struct Display {
+        pub playlist: Vec<(Song, Option<String>)>,
+        pub current: PlaylistVerseRef,
+        pub frozen_at: Option<PlaylistVerseRef>,
+        pub blanked: bool,
+    }
+}