module main

import os
import gg
import gx
import sokol.sapp

const (
    max_files = 12
    text      = 'Drag&Drop here max ${max_files} files.'
    text_size = 16
)

struct App {
mut:
    gg                &gg.Context = unsafe { nil }
    dropped_file_list []string    = []string{}
}

fn main() {
    mut font_path := os.resource_abs_path(os.join_path('..', 'assets', 'fonts', 'RobotoMono-Regular.ttf'))
    mut app := &App{
        gg: 0
    }
    app.gg = gg.new_context(
        bg_color: gx.rgb(174, 198, 255)
        width: 600
        height: 400
        window_title: 'Drag and drop'
        frame_fn: frame
        font_path: font_path
        user_data: app
        event_fn: my_event_manager
        // drag & drop
        enable_dragndrop: true
        max_dropped_files: max_files
        max_dropped_file_path_length: 2048
    )
    app.gg.run()
}

fn my_event_manager(mut ev gg.Event, mut app App) {
    // drag&drop event
    if ev.typ == .files_dropped {
        num_dropped := sapp.get_num_dropped_files()
        app.dropped_file_list.clear()
        for i in 0 .. num_dropped {
            app.dropped_file_list << sapp.get_dropped_file_path(i)
        }
    }
}

fn frame(mut app App) {
    app.gg.begin()

    mut txt_conf := gx.TextCfg{
        color: gx.black
        align: .left
        size: int(text_size * app.gg.scale + 0.5)
    }
    app.gg.draw_text(12, 12, text, txt_conf)

    mut y := 40
    for c, f in app.dropped_file_list {
        app.gg.draw_text(12, y, '[${c}] ${f}', txt_conf)
        y += text_size
    }

    app.gg.end()
}