use std::io::Write;

use ics::{
    components::Property,
    properties::{DtEnd, DtStart, Summary},
    ICalendar,
};
use sqlx::SqlitePool;

use crate::model::{event::Event, trip::Trip, user::User};
use chrono::{Duration, NaiveTime};

pub(crate) async fn get_personal_cal(db: &SqlitePool, user: &User) -> String {
    let mut calendar = ICalendar::new("2.0", "ics-rs");
    calendar.push(Property::new(
        "X-WR-CALNAME",
        "Donau Linz - Deine Ausfahrten",
    ));

    let events = Event::all_with_user(db, user).await;
    for event in events {
        calendar.add_event(event.get_vevent(db).await);
    }

    let trips = Trip::all_with_user(db, user).await;
    for trip in trips {
        calendar.add_event(trip.get_vevent(db, user).await);
    }
    let mut buf = Vec::new();
    write!(&mut buf, "{}", calendar).unwrap();
    String::from_utf8(buf).unwrap()
}

impl Trip {
    pub(crate) async fn get_vevent<'a>(self, db: &'a SqlitePool, user: &'a User) -> ics::Event<'a> {
        let mut vevent =
            ics::Event::new(format!("trip-{}@rudernlinz.at", self.id), "19900101T180000");
        let time_str = self.planned_starting_time.replace(':', "");
        let formatted_time = if time_str.len() == 3 {
            format!("0{}", time_str)
        } else {
            time_str
        };

        vevent.push(DtStart::new(format!(
            "{}T{}00",
            self.day.replace('-', ""),
            formatted_time
        )));

        let original_time = NaiveTime::parse_from_str(&self.planned_starting_time, "%H:%M")
            .expect("Failed to parse time");
        let long_trip = match self.trip_type(db).await {
            Some(a) if a.name == "Lange Ausfahrt" => true,
            _ => false,
        };
        let later_time = if long_trip {
            original_time + Duration::hours(6)
        } else {
            original_time + Duration::hours(3)
        };
        if later_time > original_time {
            // Check if no day-overflow
            let time_three_hours_later = later_time.format("%H%M").to_string();
            vevent.push(DtEnd::new(format!(
                "{}T{}00",
                self.day.replace('-', ""),
                time_three_hours_later
            )));
        }

        let mut name = String::new();
        if self.is_cancelled() {
            name.push_str("ABGESAGT");
            if let Some(notes) = &self.notes {
                if !notes.is_empty() {
                    name.push_str(&format!(" (Grund: {notes})"))
                }
            }

            name.push_str("! :-( ");
        }
        if self.cox_id == user.id {
            name.push_str("Ruderausfahrt (selber ausgeschrieben)");
        } else {
            name.push_str(&format!("Ruderausfahrt mit {} ", self.cox_name));
        }

        vevent.push(Summary::new(name));
        vevent
    }
}

impl Event {
    pub(crate) async fn get_vevent(self, db: &SqlitePool) -> ics::Event {
        let mut vevent = ics::Event::new(
            format!("event-{}@rudernlinz.at", self.id),
            "19900101T180000",
        );
        let time_str = self.planned_starting_time.replace(':', "");
        let formatted_time = if time_str.len() == 3 {
            format!("0{}", time_str)
        } else {
            time_str.clone() // TODO: remove again
        };
        vevent.push(DtStart::new(format!(
            "{}T{}00",
            self.day.replace('-', ""),
            formatted_time
        )));

        let original_time = NaiveTime::parse_from_str(&self.planned_starting_time, "%H:%M")
            .expect("Failed to parse time");

        let long_trip = match self.trip_type(db).await {
            Some(a) if a.name == "Lange Ausfahrt" => true,
            _ => false,
        };
        let later_time = if long_trip {
            original_time + Duration::hours(6)
        } else {
            original_time + Duration::hours(3)
        };
        if later_time > original_time {
            // Check if no day-overflow
            let time_three_hours_later = later_time.format("%H%M").to_string();
            vevent.push(DtEnd::new(format!(
                "{}T{}00",
                self.day.replace('-', ""),
                time_three_hours_later
            )));
        }

        let tripdetails = self.trip_details(db).await;
        let mut name = String::new();
        if self.is_cancelled() {
            name.push_str("ABGESAGT");
            if let Some(notes) = &tripdetails.notes {
                if !notes.is_empty() {
                    name.push_str(&format!(" (Grund: {notes})"))
                }
            }

            name.push_str("! :-( ");
        }
        name.push_str(&format!("{} ", self.name));

        if let Some(triptype) = tripdetails.triptype(db).await {
            name.push_str(&format!("• {} ", triptype.name))
        }
        vevent.push(Summary::new(name));
        vevent
    }
}