From a3d317a64da3a7fa5651bc5e791332b0c3b6c9f0 Mon Sep 17 00:00:00 2001
From: Muhammad Nauman Raza <devraza.hazard643@slmail.me>
Date: Tue, 28 May 2024 20:53:41 +0100
Subject: [PATCH] feat: navigating the list of anime fetched

---
 src/api.rs     |  4 +--
 src/app.rs     | 80 ++++++++++++++++++++++++++++++++++++++++++++++++--
 src/handler.rs | 17 +++++++++--
 src/ui.rs      | 22 +++++++++-----
 4 files changed, 110 insertions(+), 13 deletions(-)

diff --git a/src/api.rs b/src/api.rs
index eacb160..dcf96fb 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize, Debug)]
 #[allow(non_snake_case)]
-pub struct SearchResults {
+pub struct SearchResult {
     pub id: String,
     pub title: String,
     pub url: String,
@@ -15,7 +15,7 @@ pub struct SearchResults {
 pub struct Search {
     pub currentPage: String,
     pub hasNextPage: bool,
-    pub results: Vec<SearchResults>,
+    pub results: Vec<SearchResult>,
 }
 
 pub async fn query_anime(query: String) -> Result<Search, reqwest::Error> {
diff --git a/src/app.rs b/src/app.rs
index 6254074..8c38321 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,10 +1,68 @@
 use std::error;
 
 use tui_input::Input;
+use ratatui::widgets::ListState;
+
+use crate::api::SearchResult;
 
 /// Application result type.
 pub type AppResult<T> = std::result::Result<T, Box<dyn error::Error>>;
 
+struct ListItem {
+    title: String,
+    released: String,
+}
+
+pub struct ResultList {
+    pub state: ListState,
+    pub items: Vec<SearchResult>,
+    pub last_selected: Option<usize>,
+}
+
+impl ResultList {
+    pub fn next(&mut self) {
+        let i = match self.state.selected() {
+            Some(i) => {
+                if i >= self.items.len() - 1 {
+                    0
+                } else {
+                    i + 1
+                }
+            }
+            None => self.last_selected.unwrap_or(0),
+        };
+        self.state.select(Some(i));
+    }
+    pub fn previous(&mut self) {
+        let i = match self.state.selected() {
+            Some(i) => {
+                if i == 0 {
+                    self.items.len() - 1
+                } else {
+                    i - 1
+                }
+            }
+            None => self.last_selected.unwrap_or(0),
+        };
+        self.state.select(Some(i));
+    }
+    pub fn unselect(&mut self) {
+        let offset = self.state.offset();
+        self.last_selected = self.state.selected();
+        self.state.select(None);
+        *self.state.offset_mut() = offset;
+    }
+}
+
+impl ListItem {
+    fn new(title: &str, released: &str) -> Self {
+        Self {
+            title: title.to_string(),
+            released: released.to_string(),
+        }
+    }
+}
+
 /// Application state
 pub struct App {
     /// Current value of the input box
@@ -12,7 +70,11 @@ pub struct App {
     /// Is the app running?
     pub running: bool,
     /// Results from the search query
-    pub results: String,
+    pub results: Vec<SearchResult>,
+    /// Which chunk is currently selected?
+    pub chunk: usize,
+    /// Which list item is currently selected?
+    pub list: ResultList,
 }
 
 impl Default for App {
@@ -20,7 +82,13 @@ impl Default for App {
         App {
             input: Input::default(),
             running: true,
-            results: "".to_string(),
+            results: vec![],
+            chunk: 1,
+            list: ResultList {
+                state: ListState::default(),
+                items: Vec::new(),
+                last_selected: None
+            },
         }
     }
 }
@@ -38,4 +106,12 @@ impl App {
     pub fn quit(&mut self) {
         self.running = false;
     }
+
+    pub fn go_top(&mut self) {
+        self.list.state.select(Some(0));
+    }
+
+    pub fn go_bottom(&mut self) {
+        self.list.state.select(Some(self.list.items.len() - 1));
+    }
 }
diff --git a/src/handler.rs b/src/handler.rs
index e11f8d4..3a1faa9 100644
--- a/src/handler.rs
+++ b/src/handler.rs
@@ -1,5 +1,6 @@
 use crate::api::query_anime;
-use crate::app::{App, AppResult};
+use crate::app::{App, AppResult, ResultList};
+use crate::handler::KeyCode::*;
 
 use crossterm::event::*;
 use tui_input::backend::crossterm::EventHandler;
@@ -18,12 +19,24 @@ pub async fn handle_key_events(key_event: KeyEvent, app: &mut App) -> AppResult<
             app.quit();
         }
         KeyEvent { code: KeyCode::Enter, .. } => {
-            app.results = format!("{:#?}", query_anime(app.input.to_string()).await.unwrap().results);
+            app.list = ResultList {
+                state: app.list.state.clone(),
+                items: query_anime(app.input.to_string()).await.unwrap().results,
+                last_selected: app.list.last_selected,
+            };
+            app.chunk = 2;
             app.input.reset();
         }
         _ => {
             app.input.handle_event(&Event::Key(key_event));
         }
     }
+    match key_event.code {
+                        Char('j') | Down => app.list.next(),
+                        Char('k') | Up => app.list.previous(),
+                        Char('g') => app.go_top(),
+                        Char('G') => app.go_bottom(),
+                        _ => {}
+                }
     Ok(())
 }
diff --git a/src/ui.rs b/src/ui.rs
index 88ed747..f3ca4f2 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -46,12 +46,20 @@ pub fn render(app: &mut App, frame: &mut Frame) {
                 .title("Search (Anime)"),
         );
     frame.render_widget(input, chunks[1]);
-    frame.set_cursor(
-        chunks[1].x + ((app.input.visual_cursor()).max(scroll) - scroll) as u16 + 1,
-        chunks[1].y + 1,
-    );
 
-    let messages = Paragraph::new(&*app.results)
-        .block(Block::default().borders(Borders::ALL).title("Results"));
-    frame.render_widget(messages, chunks[2]);
+    let raw_results = &*app.list.items;
+    let mut results: Vec<String> = Vec::new();
+    for i in raw_results {
+        results.push(format!("{}\n{}", i.title, i.releaseDate));
+    }
+
+    let list = List::new(results)
+        .block(Block::bordered().title("Search Results"))
+        .style(Style::default().fg(Color::White))
+        .highlight_style(Style::default().add_modifier(Modifier::ITALIC))
+        .highlight_symbol("┃ ")
+        .repeat_highlight_symbol(true)
+        .direction(ListDirection::TopToBottom);
+
+    frame.render_stateful_widget(list, chunks[2], &mut app.list.state);
 }