use crate::actions::action::{Action, ProcessedMagnets};
use crate::actions::bitmagnet::BitmagnetAction;
use crate::actions::factory::init_action;
use crate::actions::transmission::TransmissionAction;
use crate::config::Config;
use crate::db::Database;
use crate::notifications::factory::init_notification;
use crate::notifications::notification::Notification;
use crate::notifications::ntfy::NtfyNotification;
use crate::reddit_client::{RedditClient, RedditPost};
use crate::report;
use color_eyre::eyre::{Result, WrapErr};
use log::{debug, info, warn};
use multimap::MultiMap;
use regex::Regex;
use std::collections::{HashMap, HashSet};

/// Trait for configurations that can be enabled or disabled
pub trait Enableable {
    /// Returns whether the configuration is enabled
    fn is_enabled(&self) -> bool;
}

/// Application state and behavior
pub struct App {
    db: Database,
    config: Config,
    actions: Vec<Box<dyn Action>>,
    notifications: Vec<Box<dyn Notification>>,
    reddit_client: RedditClient,
}

impl App {
    /// Create a new App instance
    pub fn new(db: Database, config: Config) -> Self {
        Self {
            db,
            config,
            actions: Vec::new(),
            notifications: Vec::new(),
            reddit_client: RedditClient::new(),
        }
    }

    /// Initialize actions based on configuration
    pub fn init_actions(&mut self) -> Result<()> {
        if let Some(action) = init_action(&mut &self.config.bitmagnet, BitmagnetAction::new)? {
            self.actions.push(action);
        }
        if let Some(action) = init_action(&mut &self.config.transmission, TransmissionAction::new)?
        {
            self.actions.push(action);
        }

        Ok(())
    }

    /// Initialize notifications based on configuration
    pub fn init_notifications(&mut self) -> Result<()> {
        if let Some(notification) = init_notification(&self.config.ntfy, NtfyNotification::new)? {
            self.notifications.push(notification);
        }

        Ok(())
    }

    /// Fetch posts from Reddit
    pub async fn fetch_posts(&self, post_count: u32) -> Result<MultiMap<String, RedditPost>> {
        let mut unique_usernames = HashSet::new();
        for (_, source_config) in &self.config.sources {
            unique_usernames.insert(source_config.username.clone());
        }

        let mut user_posts = MultiMap::new();
        for username in unique_usernames {
            info!("Fetching posts from user [{}]", username);
            let submissions = self
                .reddit_client
                .fetch_user_submissions(&username, post_count)
                .await?;
            user_posts.insert_many(username, submissions);
        }

        Ok(user_posts)
    }

    /// Process sources and extract magnet links
    pub async fn process_sources(
        &mut self,
        user_posts: &MultiMap<String, RedditPost>,
    ) -> Result<usize> {
        let mut total_new_links = 0;

        for (source_name, source_config) in &self.config.sources {
            info!("Processing source [{}]", source_name);

            let username = source_config.username.clone();
            let title_filter = match &source_config.title_filter {
                Some(filter) => Some(
                    Regex::new(filter.as_str())
                        .context(format!("Invalid regex pattern: {}", filter))?,
                ),
                None => None,
            };

            if let Some(submissions) = user_posts.get_vec(&username) {
                for post in submissions
                    .iter()
                    .filter(|s| filter_post(&s.title, title_filter.clone()))
                {
                    let title = &post.title;
                    let body = &post.body;
                    let subreddit = &post.subreddit;

                    let magnet_links = crate::magnet::extract_magnet_links(body);
                    if !magnet_links.is_empty() {
                        let post_info = crate::PostInfo {
                            title: title.to_string(),
                            submitter: username.clone(),
                            subreddit: subreddit.to_string(),
                            magnet_links,
                            timestamp: post.created,
                            imdb_id: source_config.imdb_id.clone(),
                        };

                        // Store the post info in the database
                        match self.db.store_magnets(&post_info) {
                            Ok(count) => {
                                total_new_links += count;
                            }
                            Err(e) => {
                                warn!("Failed to store post info in database: {}", e);
                            }
                        }
                    }
                }
            }
        }

        Ok(total_new_links)
    }

    /// Process magnet links with actions
    pub async fn process_actions(&mut self) -> Result<HashMap<String, ProcessedMagnets>> {
        let mut action_results = HashMap::new();

        for action in &mut self.actions {
            debug!("Processing magnet links with {}", action.get_name());

            match action.process_unprocessed_magnets(&mut self.db).await {
                Ok(processed_magnets) => {
                    let count = processed_magnets.success.len();
                    debug!(
                        "Successfully processed {} magnet links with {}",
                        count,
                        action.get_name()
                    );
                    action_results.insert(action.get_name().to_string(), processed_magnets);
                }
                Err(e) => {
                    warn!(
                        "Failed to process magnet links with {}: {}",
                        action.get_name(),
                        e
                    );
                }
            }
        }

        Ok(action_results)
    }

    /// Send notifications
    pub async fn send_notifications(
        &self,
        action_results: &HashMap<String, ProcessedMagnets>,
        total_new_links: usize,
    ) -> Result<()> {
        for notification in &self.notifications {
            match notification
                .send_notification(action_results, total_new_links)
                .await
            {
                Ok(_) => {
                    debug!(
                        "Successfully sent notification to {}",
                        notification.get_name()
                    );
                }
                Err(e) => {
                    warn!(
                        "Failed to send notification to {}: {}",
                        notification.get_name(),
                        e
                    );
                }
            }
        }

        Ok(())
    }

    /// Generate and display report
    pub fn generate_report(
        &self,
        action_results: &HashMap<String, ProcessedMagnets>,
        total_new_links: usize,
    ) {
        for line in report::generate_report(action_results, total_new_links, true).lines() {
            info!("{}", line);
        }
    }

    pub async fn run(&mut self, post_count: u32) -> Result<()> {
        self.init_actions()?;
        self.init_notifications()?;

        // Fetch posts from Reddit
        let user_posts = self.fetch_posts(post_count).await?;

        // Process sources and extract magnet links
        let total_new_links = self.process_sources(&user_posts).await?;

        // Process magnet links with actions
        let action_results = self.process_actions().await?;

        // Send notifications
        self.send_notifications(&action_results, total_new_links)
            .await?;

        // Generate and display report
        self.generate_report(&action_results, total_new_links);

        Ok(())
    }
}

/// Filters posts based on a title filter pattern
fn filter_post(title: &str, title_filter: Option<Regex>) -> bool {
    match title_filter {
        Some(pattern) => pattern.is_match(title),
        None => true,
    }
}