// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

.pragma library

// The file state's Do row. op is a fileops operation, or "md" for the
// daemon's write, or "compress", which opens the COMPRESS formats. kinds
// lists the staged kinds it fits ("any" fits every mix); min is the number
// of files it needs and max the most it takes (To .md writes one file from
// one PDF); format is the suffix a file already has when the
// operation would not change it. icon is a Nerd Font codepoint, checked in
// Inconsolata Nerd Font's cmap.
const OPS = [
    { label: "To .md", icon: "\uf48a", op: "md", kinds: ["pdf"], max: 1 },
    { label: "To images", icon: "\uf1c5", op: "pdf-images", kinds: ["pdf"] },
    { label: "Merge", icon: "\uf419", op: "pdf-merge", kinds: ["pdf"], min: 2 },
    { label: "Extract audio", icon: "\uf001", op: "audio", kinds: ["video"] },
    { label: "To MP4", icon: "\uf008", op: "mp4", kinds: ["video"], format: [".mp4"] },
    { label: "To WebM", icon: "\uf008", op: "webm", kinds: ["video"], format: [".webm"] },
    { label: "To GIF", icon: "\uf1c8", op: "gif", kinds: ["video"] },
    { label: "Trackcrop", icon: "\uf05b", op: "trackcrop", kinds: ["video"] },
    { label: "To PNG", icon: "\uf03e", op: "png", kinds: ["image"], format: [".png"] },
    { label: "To JPEG", icon: "\uf03e", op: "jpeg", kinds: ["image"], format: [".jpg", ".jpeg"] },
    { label: "To WebP", icon: "\uf03e", op: "webp", kinds: ["image"], format: [".webp"] },
    { label: "Resize 50%", icon: "\uf065", op: "half", kinds: ["image"] },
    { label: "Extract", icon: "\uf07c", op: "extract", kinds: ["archive"] },
    { label: "Compress…", icon: "\uf1c6", op: "compress", kinds: ["any"] },
];

var COMPRESS = [
    { label: ".zip", icon: "\uf1c6", op: "zip" },
    { label: ".tar.gz", icon: "\uf1c6", op: "tgz" },
    { label: ".tar.xz", icon: "\uf1c6", op: "txz" },
    { label: ".tar.bz2", icon: "\uf1c6", op: "tbz2" },
];

function ext(name) {
    const n = name.toLowerCase(), dot = n.lastIndexOf(".");
    return dot > 0 ? n.slice(dot) : "";
}

function offered(files) {
    if (!files.length) return [];
    return OPS.filter(o => (o.kinds.includes("any") || files.every(f => o.kinds.includes(f.kind)))
        && files.length >= (o.min ?? 1) && files.length <= (o.max ?? Infinity)
        && !(o.format && files.every(f => o.format.includes(ext(f.name)))));
}