1 files changed, 88 insertions, 0 deletions

diff --git a/src/commands/modification.rs b/src/commands/modification.rs
new file mode 100644
index 0000000..43e2180
--- /dev/null
+++ b/src/commands/modification.rs
@@ -0,0 +1,88 @@
+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};
+
+pub async fn modification(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
+    
+    if args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))) }
+
+    let arguments = Input::from(args.unwrap().join(" "))?;
+
+    if arguments.args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+
+    match arguments.command.as_str() {
+        "add" => {
+            add(config, arguments.args.unwrap()).await
+        },
+        "remove" => {
+            remove(config, arguments.args.unwrap())
+        },
+        _ => Err(Box::new(Error::new(ErrorKind::InvalidInput, "UNKNOWN_SUBCOMMAND")))
+    }
+}
+
+async fn add(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+    
+    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+    
+    let current_list = get_current_list(config.clone())?;
+
+    let project = project(String::from(&config.apis.modrinth), &args[0]).await;
+
+    dbg!(&project);
+
+    if project.versions.is_empty() { panic!("This should never happen"); };
+
+    let available_versions = versions(String::from(&config.apis.modrinth), String::from(&project.id), current_list.clone()).await;
+
+    let current_version = extract_current_version(available_versions.clone())?;
+    
+    //add to current list and mod table
+    match get_mods_from_list(config.clone(), current_list.clone()) {
+        Ok(mods) => {
+            dbg!(&mods);
+            if mods.contains(&project.id) {
+                return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_ON_LIST"))); } 
+            else {
+                insert_mod_in_list(config.clone(), current_list.clone(), String::from(&project.id), current_version, available_versions)?;
+            } 
+        },
+        Err(..) => insert_mod_in_list(config.clone(), current_list, String::from(&project.id), current_version, available_versions)?,
+    };
+    
+    match get_mods(config.clone()) {
+        Ok(mods) => {
+            dbg!(&mods);
+            if mods.contains(&project.id) {
+                return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_IN_DATABASE")))
+            } else {
+                insert_mod(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?;
+            } 
+        },
+        Err(..) => insert_mod(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?,
+    };
+
+    Ok(())
+}
+
+fn remove(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+
+    let current_list = get_current_list(config.clone())?;
+    let mod_id = get_mod_id(config.clone(), String::from(&args[0]))?;
+    
+    //TODO implement remove from modlist if not in any other lists && config clean is true
+    match remove_mod_from_list(config, current_list, mod_id) {
+        Err(err) => { Err(Box::new(err)) },
+        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"),
+    }
+}