// 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.


import QtQuick
import "../.."
import "../appearance"
import "../sound"
import "Sonix.js" as S

// Playlists: list, play, open, remove tracks, and new names that become
// playlists when Folders adds their first track. No rename, delete or
// reorder: SonixLink has none (README.md).
Column {
    id: pl
    required property var mod
    property var lists: []
    property string open: ""
    property var tracks: []
    property string error: ""
    property var rev: undefined
    spacing: 8

    function glyph(cp) { return String.fromCodePoint(cp); }
    function report(ok, d, err) { pl.error = ok ? "" : err; }

    function load() {
        Sonix.get("/api/playlists", (ok, d, err) => {
            pl.report(ok, d, err);
            if (!ok) return;
            pl.lists = d.playlists || [];
            const names = pl.lists.map(l => l.name);
            pl.mod.draftPlaylists = pl.mod.draftPlaylists.filter(n => names.indexOf(n) < 0);
        });
        if (pl.open !== "") pl.loadTracks();
    }
    function loadTracks() {
        Sonix.get("/api/playlist?" + S.query({ name: pl.open }), (ok, d, err) => {
            pl.report(ok, d, err);
            if (ok && d.name === pl.open) pl.tracks = d.tracks || [];
        });
    }

    Component.onCompleted: { pl.rev = Sonix.player.playlists_revision; pl.load(); }
    // Edits made on the player show up: the state carries a revision.
    Connections {
        target: Sonix
        function onPlayerChanged() {
            const r = Sonix.player.playlists_revision;
            if (r !== undefined && r !== pl.rev) { pl.rev = r; pl.load(); }
        }
    }

    // --- the list ---------------------------------------------------------

    Row {
        visible: pl.open === ""
        spacing: 8
        Field { id: newName; width: 220; placeholder: "New playlist name" }
        Button {
            text: "New"
            onClicked: {
                const n = newName.value.trim();
                if (n === "" || pl.lists.some(l => l.name === n) || pl.mod.draftPlaylists.indexOf(n) >= 0) return;
                pl.mod.draftPlaylists = pl.mod.draftPlaylists.concat([n]);
                newName.value = "";
            }
        }
    }

    Repeater {
        model: pl.open === "" ? pl.lists : []
        delegate: SonixRow {
            required property var modelData
            width: pl.width
            text: modelData.name
            sub: modelData.count + " tracks"
            onClicked: { pl.open = modelData.name; pl.tracks = []; pl.loadTracks(); }
            TransportButton {
                glyph: pl.glyph(0xF040A)  // md-play
                onClicked: Sonix.command({ do: "play_all", list: "playlist", value: modelData.name }, null, pl.report)
            }
        }
    }

    Repeater {
        model: pl.open === "" ? pl.mod.draftPlaylists : []
        delegate: SonixRow {
            required property var modelData
            width: pl.width
            text: modelData
            sub: "empty: add its first track from Folders"
        }
    }

    // --- one playlist -----------------------------------------------------

    Row {
        visible: pl.open !== ""
        spacing: 8
        Button { text: "Playlists"; icon: "\uF053"; onClicked: { pl.open = ""; pl.tracks = []; pl.load(); } }
        Button {
            text: "Play all"
            onClicked: Sonix.command({ do: "play_all", list: "playlist", value: pl.open }, null, pl.report)
        }
    }

    Text {
        textFormat: Text.PlainText
        visible: pl.open !== ""
        text: pl.open
        font { family: Theme.fontFamily; pixelSize: Theme.fontSize; bold: true }
        color: Theme.text
    }

    Repeater {
        model: pl.open !== "" ? pl.tracks : []
        delegate: SonixRow {
            required property var modelData
            width: pl.width
            text: modelData.title || (modelData.path || "").split("/").pop()
            sub: modelData.artist || ""
            TransportButton {
                glyph: pl.glyph(0xF040A)  // md-play
                onClicked: Sonix.command({ do: "play_path", path: modelData.path, list: "playlist", value: pl.open },
                                         null, pl.report)
            }
            TransportButton {
                glyph: pl.glyph(0xF0156)  // md-close
                onClicked: Sonix.command({ do: "playlist_remove", value: pl.open }, modelData.path,
                                         (ok, d, err) => { pl.report(ok, d, err); if (ok) pl.loadTracks(); })
            }
        }
    }

    Text {
        visible: pl.error !== ""
        width: pl.width
        wrapMode: Text.Wrap
        text: pl.error
        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
        color: Theme.red
    }
}