2 files changed, 120 insertions, 31 deletions

diff --git a/src/commands/modification.rs b/src/commands/modification.rs
index 43e2180..b90c82c 100644
--- a/src/commands/modification.rs
+++ b/src/commands/modification.rs
@@ -1,6 +1,6 @@
 use std::io::{Error, ErrorKind};
 
-use crate::{modrinth::{project, versions, Version}, config::Cfg, db::{insert_mod, remove_mod_from_list, get_mod_id, insert_mod_in_list, get_mods, get_mods_from_list}, input::Input, get_current_list};
+use crate::{modrinth::{project, versions, extract_current_version}, config::Cfg, db::{insert_mod, remove_mod_from_list, get_mod_id, insert_mod_in_list, get_mods, get_mods_from_list}, input::Input, get_current_list};
 
 pub async fn modification(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
     
@@ -77,12 +77,3 @@ fn remove(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Erro
         Ok(()) => Ok(()),
     }
 }
-
-fn extract_current_version(versions: Vec<Version>) -> Result<String, Box<dyn std::error::Error>> {
-    match versions.len() {
-        0 => Err(Box::new(Error::new(ErrorKind::NotFound, "NO_VERSIONS_AVAILABLE"))),
-        //TODO compare publish dates
-        1.. => Ok(versions[0].id.to_string()),
-        _ => panic!("available_versions should never be negative"),
-    }
-}
diff --git a/src/commands/update.rs b/src/commands/update.rs
index 14c37ec..6275bce 100644
--- a/src/commands/update.rs
+++ b/src/commands/update.rs
@@ -1,40 +1,138 @@
-use std::io::{Error, ErrorKind};
+use std::{io::{Error, ErrorKind, Write}, fs::File};
 
-use crate::{config::Cfg, modrinth::projects, get_current_list, db::{get_mods_from_list, get_versions}};
+use reqwest::Client;
+
+use futures_util::StreamExt;
+
+use crate::{config::Cfg, modrinth::{projects, Project, versions, extract_current_version, Version}, get_current_list, db::{get_mods_from_list, get_versions, get_list_version, change_list_versions}, List};
 
 pub async fn update(config: Cfg) -> Result<(), Box<dyn std::error::Error>> {
 
     let current_list = get_current_list(config.clone())?;
 
-    let mods = get_mods_from_list(config.clone(), current_list)?;
+    let mods = get_mods_from_list(config.clone(), current_list.clone())?;
+
+    let mut versions = get_versions(config.clone(), mods.clone())?;
+    versions.sort_by_key(|ver| ver.mod_id.clone());
 
-    let mut projects = projects(String::from(&config.apis.modrinth), mods.clone()).await;
+    let mut projects = projects(String::from(&config.apis.modrinth), mods).await;
+    projects.sort_by_key(|pro| pro.id.clone());
     
-    let mut versions = get_versions(config, mods)?;
+    let mut updatestack: Vec<Version> = vec![];
+    for (index, project) in projects.into_iter().enumerate() {
+        let current_version = &versions[index];
+
+        let p_id = String::from(&project.id);
+        let v_id = &current_version.mod_id;
+
+        if &p_id != v_id { return Err(Box::new(Error::new(ErrorKind::Other, "SORTING_ERROR"))) };
+        
+        if project.versions.join("|") != current_version.versions {
+            updatestack.push(match specific_update(config.clone(), current_list.clone(), project).await {
+                Ok(ver) => ver,
+                //TODO handle errors (only continue on "NO_UPDATE_AVAILABLE")
+                Err(_) => { continue; },
+            });
+        };
+    };
+    //println!("{:?}", updatestack);
+
+    //download_updates(config, updatestack).await?;
+
+    Ok(())
+}
+
+async fn specific_update(config: Cfg, list: List, project: Project) -> Result<Version, Box<dyn std::error::Error>> {
+    print!("Checking update for '{}' in {}", project.title, list.id);
     
-    projects.sort_by_key(|p| p.id.clone());
+    let applicable_versions = versions(String::from(&config.apis.modrinth), String::from(&project.id), list.clone()).await;
+    
+    let mut versions: Vec<String> = vec![];
 
-    versions.sort_by_key(|v| v.mod_id.clone());
+    for ver in &applicable_versions {
+        versions.push(String::from(&ver.id));
+    }
     
-    let mut update_stack: Vec<String> = vec![];
+    let mut current: Vec<Version> = vec![];
+    if versions.join("|") != get_list_version(config.clone(), list.clone(), String::from(&project.id))? {
+        //get new versions
+        print!(" | getting new version");
+        let current_str = extract_current_version(applicable_versions.clone())?;
+        current.push(applicable_versions.into_iter().find(|ver| ver.id == current_str).unwrap());
+        change_list_versions(config, list, current_str, versions, project.id)?;
+    }
 
-    for (index, project) in projects.iter().enumerate() {
+    if current.is_empty() { return Err(Box::new(Error::new(ErrorKind::NotFound, "NO_UPDATE_AVAILABLE"))) };
+    
+    println!(" | ✔️");
+    Ok(current[0].clone())
+}
 
-        let cmp_version = &versions[index];
+async fn download_updates(config: Cfg, versions: Vec<Version>) -> Result<String, Box<dyn std::error::Error>> {
 
-        let p_id = &project.id;
-        let v_id = &cmp_version.mod_id;
+    let dl_path = String::from(&config.downloads);
 
-        if p_id != v_id { return Err(Box::new(Error::new(ErrorKind::Other, "COMPARE_SORTING_ERR"))); };
-        println!("{}:{}", p_id, v_id);
+    for ver in versions {
+        let primary_file = ver.files.into_iter().find(|file| file.primary).unwrap();
+        let dl_path_file = format!("{}/{}", config.downloads, primary_file.filename);
+        println!("Downloading {}", primary_file.url);
 
-        if project.versions.join("|") != cmp_version.versions {
-            update_stack.push(String::from(&project.id));
-        };
-    };
+        let res = Client::new()
+            .get(String::from(&primary_file.url))
+            .send()
+            .await
+            .or(Err(format!("Failed to GET from '{}'", &primary_file.url)))?;
+        
+        // download chunks
+        let mut file = File::create(String::from(&dl_path_file)).or(Err(format!("Failed to create file '{}'", dl_path_file)))?;
+        let mut stream = res.bytes_stream();
 
-    //TODO UPDATE
-    dbg!(update_stack);
+        while let Some(item) = stream.next().await {
+            let chunk = item.or(Err("Error while downloading file"))?;
+            file.write_all(&chunk)
+                .or(Err("Error while writing to file"))?;
+        }
+    }
 
-    Ok(())
+    Ok(dl_path)
+}
+
+#[tokio::test]
+async fn download_updates_test() {
+
+    use crate::{modrinth::{Version, VersionFile, Hash, VersionType}, config::{Cfg, Apis}};
+    
+    let config = Cfg { data: "...".to_string(), clean_remove: false, downloads: "./dl".to_string(), apis: Apis { modrinth: "...".to_string() } };
+
+    let versions = vec![Version { 
+            id: "dEqtGnT9".to_string(),
+            project_id: "kYuIpRLv".to_string(),
+            author_id: "Qnt13hO8".to_string(),
+            featured: true,
+            name: "1.2.2-1.19 - Fabric".to_string(),
+            version_number: "1.2.2-1.19".to_string(),
+            changelog: None,
+            date_published: "2022-11-02T17:41:43.072267Z".to_string(),
+            downloads: 58,
+            version_type: VersionType::release,
+            files: vec![VersionFile {
+                    hashes: Hash {
+                        sha1: "fdc6dc39427fc92cc1d7ad8b275b5b83325e712b".to_string(),
+                        sha512: "5b372f00d6e5d6a5ef225c3897826b9f6a2be5506905f7f71b9e939779765b41be6f2a9b029cfc752ad0751d0d2d5f8bb4544408df1363eebdde15641e99a849".to_string()
+                    },
+                    url: "https://cdn.modrinth.com/data/kYuIpRLv/versions/dEqtGnT9/waveycapes-fabric-1.2.2-mc1.19.2.jar".to_string(),
+                    filename: "waveycapes-fabric-1.2.2-mc1.19.2.jar".to_string(),
+                    primary: true,
+                    size: 323176
+            }],
+            game_versions: vec![
+                "1.19".to_string(),
+                "1.19.1".to_string(),
+                "1.19.2".to_string()
+            ],
+            loaders: vec![
+                "fabric".to_string()
+            ]
+        }];
+    assert_eq!(download_updates(config, versions).await.unwrap(), "./dl")
 }