use std::sync::Arc;

use anyhow::{anyhow, Error};
use chrono::{Local, TimeZone};
use gpui::{Image, ImageFormat, SharedString};
use nostr_sdk::prelude::*;
use qrcode::render::svg;
use qrcode::QrCode;

const NOW: &str = "now";
const SECONDS_IN_MINUTE: i64 = 60;
const MINUTES_IN_HOUR: i64 = 60;
const HOURS_IN_DAY: i64 = 24;
const DAYS_IN_MONTH: i64 = 30;

pub trait RenderedTimestamp {
    fn to_human_time(&self) -> SharedString;
    fn to_ago(&self) -> SharedString;
}

impl RenderedTimestamp for Timestamp {
    fn to_human_time(&self) -> SharedString {
        let input_time = match Local.timestamp_opt(self.as_secs() as i64, 0) {
            chrono::LocalResult::Single(time) => time,
            _ => return SharedString::from("9999"),
        };

        let now = Local::now();
        let input_date = input_time.date_naive();
        let now_date = now.date_naive();
        let yesterday_date = (now - chrono::Duration::days(1)).date_naive();
        let time_format = input_time.format("%H:%M %p");

        match input_date {
            date if date == now_date => SharedString::from(format!("Today at {time_format}")),
            date if date == yesterday_date => {
                SharedString::from(format!("Yesterday at {time_format}"))
            }
            _ => SharedString::from(format!("{}, {time_format}", input_time.format("%d/%m/%y"))),
        }
    }

    fn to_ago(&self) -> SharedString {
        let input_time = match Local.timestamp_opt(self.as_secs() as i64, 0) {
            chrono::LocalResult::Single(time) => time,
            _ => return SharedString::from("1m"),
        };

        let now = Local::now();
        let duration = now.signed_duration_since(input_time);

        match duration {
            d if d.num_seconds() < SECONDS_IN_MINUTE => SharedString::from(NOW),
            d if d.num_minutes() < MINUTES_IN_HOUR => {
                SharedString::from(format!("{}m", d.num_minutes()))
            }
            d if d.num_hours() < HOURS_IN_DAY => SharedString::from(format!("{}h", d.num_hours())),
            d if d.num_days() < DAYS_IN_MONTH => SharedString::from(format!("{}d", d.num_days())),
            _ => SharedString::from(input_time.format("%b %d").to_string()),
        }
    }
}

pub trait TextUtils {
    fn to_public_key(&self) -> Result<PublicKey, Error>;
    fn to_qr(&self) -> Option<Arc<Image>>;
}

impl<T: AsRef<str>> TextUtils for T {
    fn to_public_key(&self) -> Result<PublicKey, Error> {
        let s = self.as_ref();
        if s.starts_with("nprofile1") {
            Ok(Nip19Profile::from_bech32(s)?.public_key)
        } else if s.starts_with("npub1") {
            Ok(PublicKey::parse(s)?)
        } else {
            Err(anyhow!("Invalid public key"))
        }
    }

    fn to_qr(&self) -> Option<Arc<Image>> {
        let s = self.as_ref();
        let code = QrCode::new(s).unwrap();
        let svg = code
            .render()
            .min_dimensions(256, 256)
            .dark_color(svg::Color("#000000"))
            .light_color(svg::Color("#FFFFFF"))
            .build();

        Some(Arc::new(Image::from_bytes(
            ImageFormat::Svg,
            svg.into_bytes(),
        )))
    }
}