use crate::file_list_view::FsEntry;
use crate::platform::Platform;
use crate::shared::{calculate_list_bounds, render_list_tip};
use fuzzy_matcher::skim::SkimMatcherV2;
use fuzzy_matcher::FuzzyMatcher;
use pretty_bytes::converter::convert as pretty_bytes;
use unicode_width::UnicodeWidthStr;
use zellij_tile::prelude::*;

#[derive(Default, Debug)]
pub struct SearchView {
    pub search_results: Vec<SearchResult>,
    pub selected_search_result: usize,
    pub platform: Platform,
}

impl SearchView {
    pub fn search_result_count(&self) -> usize {
        self.search_results.len()
    }
    pub fn update_search_results(&mut self, search_term: &str, files: &Vec<FsEntry>) {
        self.selected_search_result = 0;
        if search_term.is_empty() {
            self.search_results.clear();
        } else {
            let mut matches = vec![];
            let matcher = SkimMatcherV2::default().use_cache(true);
            for file in files {
                let name = file.name();
                if let Some((score, indices)) = matcher.fuzzy_indices(&name, search_term) {
                    matches.push(SearchResult::new(file.clone(), score, indices));
                }
            }
            matches.sort_by(|a, b| b.score.cmp(&a.score));
            self.search_results = matches;
        }
    }
    pub fn clear_and_reset_selection(&mut self) {
        self.search_results.clear();
        self.selected_search_result = 0;
    }
    pub fn move_selection_up(&mut self) {
        self.selected_search_result = self.selected_search_result.saturating_sub(1);
    }
    pub fn move_selection_down(&mut self) {
        if self.selected_search_result + 1 < self.search_results.len() {
            self.selected_search_result += 1;
        }
    }
    pub fn get_selected_entry(&self) -> Option<FsEntry> {
        self.search_results
            .get(self.selected_search_result)
            .map(|s| s.entry.clone())
    }
    pub fn render(&mut self, rows: usize, cols: usize) {
        let (start_index, selected_index_in_range, end_index) = calculate_list_bounds(
            self.search_results.len(),
            rows.saturating_sub(1),
            Some(self.selected_search_result),
        );
        render_list_tip(3, cols);
        for i in start_index..end_index {
            if let Some(search_result) = self.search_results.get(i) {
                let is_selected = Some(i) == selected_index_in_range;
                let mut search_result_text = search_result.name();
                let size = search_result
                    .size()
                    .map(|s| pretty_bytes(s as f64))
                    .unwrap_or("".to_owned());
                if search_result.is_folder() {
                    search_result_text.push(self.platform.separator());
                }

                let search_result_text_width = search_result_text.width();
                let size_width = size.width();
                let text = if search_result_text_width + size_width < cols {
                    let padding = " ".repeat(
                        cols.saturating_sub(search_result_text_width)
                            .saturating_sub(size_width),
                    );
                    format!("{}{}{}", search_result_text, padding, size)
                } else {
                    // drop the size, no room for it
                    let padding = " ".repeat(cols.saturating_sub(search_result_text_width));
                    format!("{}{}", search_result_text, padding)
                };
                let mut text_element = if is_selected {
                    Text::new(text).selected()
                } else {
                    Text::new(text)
                };
                if search_result.is_folder() {
                    text_element = text_element.color_range(0, ..);
                }
                text_element = text_element.color_indices(3, search_result.indices());
                print_text_with_coordinates(
                    text_element,
                    0,
                    i.saturating_sub(start_index) + 4,
                    Some(cols),
                    None,
                );
            }
        }
    }
}

#[derive(Debug)]
pub struct SearchResult {
    pub entry: FsEntry,
    pub score: i64,
    pub indices: Vec<usize>,
}

impl SearchResult {
    pub fn new(entry: FsEntry, score: i64, indices: Vec<usize>) -> Self {
        SearchResult {
            entry,
            score,
            indices,
        }
    }
    pub fn name(&self) -> String {
        self.entry.name()
    }
    pub fn size(&self) -> Option<u64> {
        self.entry.size()
    }
    pub fn indices(&self) -> Vec<usize> {
        self.indices.clone()
    }
    pub fn is_folder(&self) -> bool {
        self.entry.is_folder()
    }
}
