// Rewrite a simple slideshow in Rust using pdfpdf
extern crate pdfpdf;
use pdfpdf::{Alignment, Color, Font, Pdf};

struct Slideshow {
    width: f64,
    height: f64,
    background_color: Color,
    text_color: Color,
    pdf: Pdf,
}

impl Slideshow {
    pub fn new(
        width: f64,
        height: f64,
        font: Font,
        background_color: Color,
        text_color: Color,
    ) -> Self {
        let mut this = Slideshow {
            width: width,
            height: height,
            background_color: background_color,
            text_color: text_color,
            pdf: Pdf::new_uncompressed(),
        };
        this.pdf.font(font, 60);
        this
    }

    pub fn add_title_slide(&mut self, text: &str) -> &mut Self {
        self.add_text_slide(text);
        self
    }

    pub fn add_text_slide(&mut self, text: &str) -> &mut Self {
        // init the new slide
        self.pdf
            .add_page(self.width, self.height)
            .set_color(&self.background_color.clone())
            .draw_rectangle_filled(0.0, 0.0, self.width, self.height)
            .set_color(&self.text_color.clone())
            .draw_text(
                self.width / 2.0,
                self.height / 2.0,
                Alignment::CenterCenter,
                text,
            );
        self
    }

    pub fn write_to(&mut self, filename: &str) -> std::result::Result<(), std::io::Error> {
        self.pdf.write_to(filename)
    }
}

fn main() {
    Slideshow::new(
        1024.0,
        769.0,
        Font::Helvetica,
        Color::gray(0),
        Color::gray(255),
    ).add_title_slide("Lessons from LATHER")
        .add_text_slide("The Activity Problem\nOR\nRemove the spots")
        .add_text_slide(
            "1. Find/make a good model\n2. Run it. A lot.\n3. Listen at group meetings",
        )
        .add_text_slide("Easy to use\nWe're going to write a lot of scripts")
        .add_text_slide("SOAP: 2.4 s\nLATHER: 0.006 s")
        .add_text_slide("All I Really Need to Know I Learned in\nKindergarten")
        .add_text_slide(
            "All I Really Need to Know I Learned in\nMathematical Physics",
        )
        .write_to("lessons_from_lather.pdf")
        .expect("Couldn't save slideshow");
}