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

use structopt::StructOpt;

use ab_glyph::{FontRef, PxScale};
use image::{ImageBuffer, Rgba};
use imageproc::drawing::draw_text_mut;
use small_uid::SmallUid;
use std::path::{Path, PathBuf};

// Configuration for the label
const DPI: f32 = 300.0;
const MM_TO_PX: f32 = DPI / 25.4;
const LABEL_WIDTH: f32 = 220.0 * MM_TO_PX;
const LABEL_HEIGHT: f32 = 16.0 * MM_TO_PX;

// Elements positionning
const MARGIN_LEFT: f32 = 72.0 * 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 + 10;
const CLIENT_CODE_POS_Y: i32 = 10;
const CLIENT_CODE_SCALE: f32 = 24.0;

const SPECIES_VARIETY_POS_X: i32 = MARGIN_LEFT as i32 + 10;
const SPECIES_VARIETY_POS_Y: i32 = 80;
const SPECIES_VARIETY_SCALE: f32 = 24.0;

const DATE_POS_X: i32 = MARGIN_LEFT as i32 + 10;
const DATE_POS_Y: i32 = 40;
const DATE_SCALE: f32 = 32.0;

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"),
                species: get_cell_value(row, "species"),
                variety: get_cell_value(row, "variety"),
                delivery_week,
            })
        })
        .collect();

    Ok(records)
}

// The label looks like this:
//
//  Tomate (Solanum lycopersicum) (species)                                             /^\
//  Variété: San Marzano (variety)                                                     / j \
//                                                                                    / ard \
//                                                                                   / iflore\
//                                                                                   ---------
// SEMAINE DE LIVRAISON: 22
//
//                                                                       123 Allée des Récoltes
//                                                                       Tél: Téléphone.
//
fn generate_label(output_dir: &String, record: Record) -> PathBuf {
    let font_data = include_bytes!("./assets/DejaVuSans.ttf");
    let font = FontRef::try_from_slice(font_data).unwrap();
    let logo = image::open("./assets/logo.png").unwrap();

    let mut label = 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 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,
    );

    // Save the label

    let output_path = Path::new(output_dir).join(format!("label_{}.png", SmallUid::new()));
    label.save(output_path.clone()).unwrap();

    return output_path;
}

#[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)?;

    for record in records {
        let path = generate_label(&opts.output_dir, record);
        println!("{}", path.into_os_string().into_string().unwrap())
    }

    Ok(())
}