//! A module for writing intros and outros

use crate::{time::format_date_long, ProjectLecture, Resolution};
use svgwriter::{
	tags::{Group, Rect, TagWithPresentationAttributes, Text},
	Graphic
};

#[repr(u16)]
enum FontSize {
	Huge = 72,
	Large = 56,
	Big = 44
}

#[repr(u16)]
enum FontWeight {
	Normal = 400,
	SemiBold = 500,
	Bold = 700
}

struct Iotro {
	res: Resolution,
	g: Group
}

impl Iotro {
	fn new(res: Resolution) -> Self {
		Self {
			res,
			g: Group::new()
				.with_fill("white")
				.with_text_anchor("middle")
				.with_dominant_baseline("hanging")
				.with_font_family("Noto Sans")
		}
	}

	fn add_text<T: Into<String>>(
		&mut self,
		font_size: FontSize,
		font_weight: FontWeight,
		y_top: usize,
		content: T
	) {
		let mut text = Text::new()
			.with_x(960)
			.with_y(y_top)
			.with_font_size(font_size as u16)
			.with_font_weight(font_weight as u16);
		text.push(content.into());
		self.g.push(text);
	}

	fn finish(self) -> Graphic {
		let mut svg = Graphic::new();
		svg.set_width(self.res.width());
		svg.set_height(self.res.height());
		svg.set_view_box("0 0 1920 1080");
		svg.push(
			Rect::new()
				.with_fill("black")
				.with_x(0)
				.with_y(0)
				.with_width(1920)
				.with_height(1080)
		);
		svg.push(self.g);
		svg
	}
}

pub(crate) fn intro(res: Resolution, lecture: &ProjectLecture) -> Graphic {
	use self::{FontSize::*, FontWeight::*};

	let mut intro = Iotro::new(res);
	intro.add_text(Huge, Bold, 110, &lecture.label);
	intro.add_text(Huge, SemiBold, 250, &lecture.docent);
	intro.add_text(
		Huge,
		SemiBold,
		460,
		format!("Vorlesung vom {}", format_date_long(lecture.date))
	);
	intro.add_text(
		Big,
		Normal,
		870,
		"Video erstellt von der Video AG, Fachschaft I/1"
	);
	intro.add_text(Big, Normal, 930, "https://video.fsmpi.rwth-aachen.de");
	intro.add_text(Big, Normal, 990, "video@fsmpi.rwth-aachen.de");

	intro.finish()
}

pub(crate) fn outro(res: Resolution) -> Graphic {
	use self::{FontSize::*, FontWeight::*};

	let mut outro = Iotro::new(res);
	outro.add_text(Large, SemiBold, 50, "Video erstellt von der");
	outro.add_text(Huge, Bold, 210, "Video AG, Fachschaft I/1");
	outro.add_text(Large, Normal, 360, "Website der Fachschaft:");
	outro.add_text(Large, Normal, 430, "https://www.fsmpi.rwth-aachen.de");
	outro.add_text(Large, Normal, 570, "Videos herunterladen:");
	outro.add_text(Large, Normal, 640, "https://video.fsmpi.rwth-aachen.de");
	outro.add_text(Large, Normal, 780, "Fragen, Vorschläge und Feedback:");
	outro.add_text(Large, Normal, 850, "video@fsmpi.rwth-aachen.de");

	outro.finish()
}