use calamine::{open_workbook, Data, Reader, Xlsx};

use printpdf::image::RawImage;
use printpdf::{
    Mm, Op, PdfDocument, PdfPage, PdfSaveOptions, PdfWarnMsg, RawImageData, RawImageFormat,
    XObjectTransform,
};
use structopt::StructOpt;

use ab_glyph::{FontRef, PxScale};
use image::{ImageBuffer, Rgba};
use imageproc::drawing::draw_text_mut;

use inflector::Inflector;

// A4 dimensions
const A4_WIDTH: f32 = 210.0;
const A4_HEIGHT: f32 = 297.0;

// Configuration for the label
const DPI: f32 = 300.0;
const MM_TO_PX: f32 = DPI / 25.4;
const LABEL_WIDTH: f32 = 210.0 * MM_TO_PX;
const LABEL_HEIGHT: f32 = 16.0 * MM_TO_PX;

// Elements positionning
const MARGIN_LEFT: f32 = 80.0 * MM_TO_PX;
const MARGIN_RIGHT: f32 = 10.0 * MM_TO_PX;
// const LOGO_WIDTH: u32 = 151;
// const LOGO_HEIGHT: u32 = 64;
// const LOGO_POS_X: u32 = LABEL_WIDTH as u32 - LOGO_WIDTH - 10;
// const LOGO_POS_Y: u32 = 10;

const CLIENT_CODE_POS_X: i32 = MARGIN_LEFT as i32;
const CLIENT_CODE_POS_Y: i32 = 10;
const CLIENT_CODE_SCALE: f32 = 100.0;

const SPECIES_VARIETY_POS_X: i32 = MARGIN_LEFT as i32 + 220;
const SPECIES_VARIETY_POS_Y: i32 = 20;
const SPECIES_VARIETY_SCALE: f32 = 80.0;

const DATE_POS_X: i32 = LABEL_WIDTH as i32 - MARGIN_RIGHT as i32 - 150;
const DATE_POS_Y: i32 = 10;
const DATE_SCALE: f32 = 75.0;

const COLOR_TEXT: Rgba<u8> = Rgba([0, 0, 0, 255]);
const COLOR_BACKGROUND: Rgba<u8> = Rgba([255, 255, 255, 255]);

#[derive(Debug, Clone)]
struct Record {
    client_code: String,
    species: String,
    variety: String,
    delivery_week: String,
}

const COLUMN_MAP: [(&str, char); 5] = [
    ("client_code", 'A'),
    ("species", 'B'),
    ("variety", 'C'),
    ("sowing_week", 'I'),
    ("delivery_week", 'J'),
];

fn letter_to_index(col: char) -> usize {
    (col as u8 - b'A') as usize
}

fn column_name_to_index(column: &str) -> usize {
    COLUMN_MAP
        .map(|(name, col)| (name, letter_to_index(col)))
        .iter()
        .find(|(name, _)| *name == column)
        .unwrap()
        .1
}

fn get_cell_value(row: &[Data], column: &str) -> String {
    let col_index = column_name_to_index(column);
    match row.get(col_index) {
        Some(Data::String(s)) => s.to_string(),
        Some(Data::Float(f)) => f.to_string(),
        _ => "".to_string(),
    }
}

fn parse_xlsx(delivery_week_filter: &str) -> Result<Vec<Record>, Box<dyn std::error::Error>> {
    let mut workbook: Xlsx<_> = open_workbook("data.xlsx")?;
    let range = workbook.worksheet_range("Feuille1")?;

    let records: Vec<Record> = range
        .rows()
        .filter_map(|row| {
            let delivery_week = get_cell_value(row, "delivery_week");
            if delivery_week.to_lowercase() != delivery_week_filter.to_lowercase() {
                return None;
            }

            Some(Record {
                client_code: get_cell_value(row, "client_code").to_uppercase(),
                species: get_cell_value(row, "species").to_title_case(),
                variety: get_cell_value(row, "variety").to_title_case(),
                delivery_week: delivery_week.to_uppercase(),
            })
        })
        .collect();

    Ok(records)
}

fn generate_label(record: Record) -> ImageBuffer<Rgba<u8>, Vec<u8>> {
    let font_data = include_bytes!("./assets/DejaVuSans.ttf");
    let font = FontRef::try_from_slice(font_data).unwrap();

    let mut label: ImageBuffer<Rgba<u8>, Vec<u8>> =
        ImageBuffer::new(LABEL_WIDTH as u32, LABEL_HEIGHT as u32);

    // Fill in the background
    for pixel in label.pixels_mut() {
        *pixel = COLOR_BACKGROUND;
    }

    // Logo
    // let logo = image::open("./assets/logo.png").unwrap();
    // let resized_logo = image::imageops::resize(
    //     &logo,
    //     LOGO_WIDTH,
    //     LOGO_HEIGHT,
    //     image::imageops::FilterType::Lanczos3,
    // );

    // image::imageops::overlay(
    //     &mut label,
    //     &resized_logo,
    //     LOGO_POS_X as i64,
    //     LOGO_POS_Y as i64,
    // );

    draw_text_mut(
        &mut label,
        COLOR_TEXT,
        CLIENT_CODE_POS_X,
        CLIENT_CODE_POS_Y,
        PxScale::from(CLIENT_CODE_SCALE),
        &font,
        &record.client_code,
    );

    draw_text_mut(
        &mut label,
        COLOR_TEXT,
        DATE_POS_X,
        DATE_POS_Y,
        PxScale::from(DATE_SCALE),
        &font,
        &record.delivery_week,
    );

    let species_varieties: String = "".to_owned() + &record.species + " " + &record.variety;
    draw_text_mut(
        &mut label,
        COLOR_TEXT,
        SPECIES_VARIETY_POS_X,
        SPECIES_VARIETY_POS_Y,
        PxScale::from(SPECIES_VARIETY_SCALE),
        &font,
        &species_varieties,
    );
    return label;
}

fn combine_labels(
    labels: &[ImageBuffer<Rgba<u8>, Vec<u8>>],
    output_dir: &str,
) -> Result<(), Box<dyn std::error::Error>> {
    let labels_per_page = (A4_HEIGHT / (LABEL_HEIGHT / MM_TO_PX)) as usize;
    println!("Labels per page: {}", labels_per_page);

    // Create a new PDF document
    let mut doc = PdfDocument::new("Labels Document");
    let mut pages = Vec::new();
    let mut warnings: Vec<PdfWarnMsg> = Vec::new();

    // Group labels by page
    for chunk in labels.chunks(labels_per_page) {
        let mut page_contents = Vec::new();
        let mut y_position = 0.0;

        for label in chunk {
            let pixels = label.clone().into_raw();
            let image = RawImage {
                pixels: RawImageData::U8(pixels),
                width: LABEL_WIDTH as usize,
                height: LABEL_HEIGHT as usize,
                data_format: RawImageFormat::RGBA8,
                tag: Vec::new(),
            };
            let image_id = doc.add_image(&image);

            page_contents.push(Op::UseXobject {
                id: image_id,
                transform: XObjectTransform {
                    translate_x: None,
                    translate_y: Some(printpdf::Px(y_position as usize).into_pt(DPI)),
                    rotate: None,
                    scale_x: None,
                    scale_y: None,
                    dpi: None,
                },
            });

            // Move y position up for next label
            y_position += LABEL_HEIGHT;
        }

        // Create page and add to pages list
        let page = PdfPage::new(Mm(A4_WIDTH), Mm(A4_HEIGHT), page_contents);
        pages.push(page);
    }

    // Add all pages to document and save
    let pdf_bytes: Vec<u8> = doc
        .with_pages(pages)
        .save(&PdfSaveOptions::default(), &mut warnings);

    // Write PDF bytes to file
    std::fs::write("test.pdf", pdf_bytes)?;
    Ok(())
}

#[derive(StructOpt)]
struct Opts {
    #[structopt(short = "o", long, default_value = "output")]
    output_dir: String,
    #[structopt(short = "w", long, default_value = "06")]
    week: String,
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let opts = Opts::from_args();
    std::fs::create_dir_all(&opts.output_dir).unwrap();

    let week_number = "s".to_owned() + &opts.week;
    let records = parse_xlsx(&week_number)?;

    let mut labels = Vec::new();
    for record in records {
        labels.push(generate_label(record));
    }
    println!("labels: {}", labels.len());
    combine_labels(&labels, &opts.output_dir)
}