use std::collections::VecDeque;

use xdp_firewall_common::{FirewallEvent, RuleKey, RuleValue, Stats};

#[derive(Clone, Copy, PartialEq, Eq)]
pub enum Pane {
    Rules,
    Blocklist,
    Logs,
}

pub struct App {
    pub iface: String,
    pub quit: bool,
    pub pane: Pane,
    pub global_stats: Stats,
    pub prev_global_stats: Stats,
    pub rules: Vec<(RuleKey, RuleValue, Stats)>,
    pub blocklist: Vec<(u32, u64)>,
    pub logs: VecDeque<FirewallEvent>,
    pub max_logs: usize,
    pub pps: u64,
    pub bps: u64,
    pub dialog: Dialog,
    pub rules_selected: usize,
    pub blocklist_selected: usize,
}

#[derive(Clone, Default, PartialEq, Eq)]
pub enum Dialog {
    #[default]
    None,
    BlockIp { input: String },
    AddRule { src_ip: String, dst_ip: String, proto: String, src_port: String, dst_port: String, action: String },
    ConfirmDelete,
}

impl App {
    pub fn new(iface: String) -> Self {
        Self {
            iface,
            quit: false,
            pane: Pane::Rules,
            global_stats: Stats::default(),
            prev_global_stats: Stats::default(),
            rules: Vec::new(),
            blocklist: Vec::new(),
            logs: VecDeque::new(),
            max_logs: 100,
            pps: 0,
            bps: 0,
            dialog: Dialog::None,
            rules_selected: 0,
            blocklist_selected: 0,
        }
    }

    pub fn on_tick(&mut self, global: Stats, rules: Vec<(RuleKey, RuleValue, Stats)>, blocklist: Vec<(u32, u64)>) {
        let elapsed = 0.1;
        let pkts = global.packets.saturating_sub(self.prev_global_stats.packets);
        let bytes = global.bytes.saturating_sub(self.prev_global_stats.bytes);
        self.pps = (pkts as f64 / elapsed) as u64;
        self.bps = (bytes as f64 / elapsed) as u64;
        self.prev_global_stats = self.global_stats;
        self.global_stats = global;
        self.rules = rules;
        self.blocklist = blocklist;
    }

    pub fn add_log(&mut self, ev: FirewallEvent) {
        if self.logs.len() >= self.max_logs {
            self.logs.pop_back();
        }
        self.logs.push_front(ev);
    }

    pub fn selected_rule_id(&self) -> Option<u32> {
        self.rules.get(self.rules_selected).map(|(_, v, _)| v.rule_id)
    }

    pub fn selected_block_ip(&self) -> Option<u32> {
        self.blocklist.get(self.blocklist_selected).map(|(ip, _)| *ip)
    }
}