// 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 Quickshell
import Quickshell.Io
import Quickshell.Hyprland
import QtQuick
import "../.."
import "Autostart.js" as A

// One row per hl.exec_cmd line in autostart.lua: a switch that comments it in
// and out, the command, its workspace rule, a mark when its program is not on
// PATH, and Remove, which asks once. No Run now on a row: those ran at login,
// and a second start stacks a second instance (a second qs, AGENTS.md). Below, the add form: pick an
// installed app or type a command, whose program must resolve before Add
// enables, then a workspace and silent. Every edit is made on the file text
// as last read, and refused if its line has moved.
Column {
    id: page

    spacing: 6

    readonly property string home: Quickshell.env("HOME")
    // autostart.lua, from the module.
    required property string file
    property var entries: []
    // Entry index -> the program's resolved path, "" when it is not found.
    property var found: ({})
    property string error: ""
    // The line index whose Remove has been clicked once.
    property int confirming: -1

    // The add form.
    property bool picking: true
    property string query: ""
    property string pickedName: ""
    property string newCmd: ""
    // "" nothing to check, "?" checking, "-" not found, else the path.
    property string newFound: ""
    property string newWs: ""
    property bool newSilent: true

    FileView {
        id: fv
        path: page.file
        // Hyprland reloads its config on every change, so a half-written file
        // would reach it.
        atomicWrites: true
        watchChanges: true
        onFileChanged: reload()
        onLoaded: page.setEntries(A.parse(text()))
        onLoadFailed: err => page.error = "Cannot read " + path + ": " + FileViewError.toString(err)
        onSaveFailed: err => page.error = "Cannot write " + path + ": " + FileViewError.toString(err)
    }

    function setEntries(list) {
        page.entries = list;
        page.confirming = -1;
        page.check(list.map(e => A.program(e.cmd, page.home)), paths => {
            const f = {};
            list.forEach((e, i) => f[e.index] = paths[i]);
            page.found = f;
        });
    }

    // Each program's path as `command -v` finds it on this shell's PATH,
    // which is the one Hyprland passes to what it launches. "" if not found.
    function check(progs, cb) {
        if (progs.length === 0) { cb([]); return; }
        op.createObject(page, {
            command: ["sh", "-c", 'for p; do command -v -- "$p" || echo; done', "sh"].concat(progs),
            cb: out => cb(out.split("\n").slice(0, progs.length)),
        }).running = true;
    }
    // One Process per call, so checks never share one (a running Process
    // ignores a second start, AGENTS.md).
    Component {
        id: op
        Process {
            id: proc
            property var cb: null
            stdout: StdioCollector {
                onStreamFinished: {
                    try { proc.cb(text); }
                    finally { proc.destroy(); }
                }
            }
        }
    }

    // Through Hyprland, so a [workspace ...] rule applies as it will at login.
    function run(cmd) {
        Quickshell.execDetached(["hyprctl", "dispatch", 'hl.dsp.exec_cmd("' + A.quote(cmd) + '")']);
    }

    // t is the new file text from Autostart.js, or null when the line an
    // edit targeted is no longer the one parsed.
    function apply(t) {
        page.confirming = -1;
        if (t === null) {
            page.error = "autostart.lua changed underneath, reloaded. Try again.";
            fv.reload();
            return;
        }
        page.error = "";
        fv.setText(t);
        page.setEntries(A.parse(t));
    }

    readonly property string composed: A.compose(page.newWs, page.newSilent, page.newCmd.trim())
    readonly property bool addable: page.newCmd.trim() !== "" && page.newFound !== "" && page.newFound !== "?" && page.newFound !== "-"

    function add() {
        if (!page.addable) return;
        const t = A.add(fv.text(), page.composed);
        if (t === null) { page.error = "No closing end) in autostart.lua to add before."; return; }
        page.apply(t);
        page.newCmd = "";
        page.pickedName = "";
        page.query = "";
    }

    onNewCmdChanged: { page.newFound = page.newCmd.trim() === "" ? "" : "?"; debounce.restart(); }
    Timer {
        id: debounce
        interval: 250
        onTriggered: {
            const cmd = page.newCmd;
            if (cmd.trim() === "") return;
            page.check([A.program(cmd, page.home)], p => {
                if (cmd === page.newCmd) page.newFound = p[0] || "-";
            });
        }
    }

    // The workspaces offered: the scratchpad, the eight numbered ones, and
    // any other name Hyprland has open or an entry already uses.
    readonly property var workspaces: {
        const names = ["special", "1", "2", "3", "4", "5", "6", "7", "8"];
        const more = Hyprland.workspaces.values.map(w => w.name)
            .concat(page.entries.map(e => (A.workspace(A.split(e.cmd).rule) ?? { ws: "" }).ws));
        for (const n of more) if (n && !names.includes(n)) names.push(n);
        return names;
    }

    // Installed apps for the picker: the launcher's .desktop entries, minus
    // hidden ones and terminal apps, which would need a terminal wrapped
    // around them. ponytail: terminal apps go through "Command" instead.
    readonly property var apps: {
        const q = page.query.trim().toLowerCase();
        return DesktopEntries.applications.values
            .filter(a => !a.noDisplay && !a.runInTerminal && a.execString
                    && (q === "" || a.name.toLowerCase().includes(q)
                        || (a.genericName ?? "").toLowerCase().includes(q)))
            .sort((a, b) => a.name.localeCompare(b.name))
            .slice(0, 8);
    }

    component Small: Text {
        color: Theme.subtext
        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
    }

    component Field: Rectangle {
        id: field
        property string text: ""
        property string placeholder: ""
        signal edited(string text)
        signal accepted
        height: 34
        radius: 8
        color: Theme.surface
        TextInput {
            activeFocusOnTab: true
            id: ti
            anchors { fill: parent; leftMargin: 10; rightMargin: 10 }
            verticalAlignment: TextInput.AlignVCenter
            clip: true
            selectByMouse: true
            color: Theme.text
            font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
            text: field.text
            onTextEdited: field.edited(text)
            onAccepted: field.accepted()
            Text {
                anchors.verticalCenter: parent.verticalCenter
                visible: parent.text === ""
                text: field.placeholder
                color: Theme.subtext
                font: parent.font
            }
        }
    }

    // A selectable pill: the picker/command switch and the workspace choices.
    component Chip: Rectangle {
        id: chip
        property string text: ""
        property bool selected: false
        signal clicked
        implicitWidth: chipLabel.implicitWidth + 20
        implicitHeight: 28
        radius: 14
        color: selected ? Qt.alpha(Theme.accent, 0.85)
             : chipArea.containsMouse ? Qt.alpha(Theme.accent, 0.22) : Qt.alpha(Theme.surface, 0.8)
        border.width: 1
        border.color: Qt.alpha(Theme.text, 0.15)
        Text {
            id: chipLabel
            anchors.centerIn: parent
            text: chip.text
            color: chip.selected ? Theme.base : Theme.text
            font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 3 }
        }
        MouseArea {
            id: chipArea
            anchors.fill: parent
            hoverEnabled: true
            cursorShape: Qt.PointingHandCursor
            onClicked: chip.clicked()
        }
    }

    Small {
        width: parent.width
        text: "Changes apply at next login. Try starts a new entry in this session."
        wrapMode: Text.Wrap
    }

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

    Repeater {
        model: page.entries

        // Items with anchors, not Rows: a Row sizes to its children and fixed
        // widths in one overflow the page (AGENTS.md).
        delegate: Item {
            id: row
            required property var modelData
            readonly property var parts: A.split(modelData.cmd)
            readonly property var where: A.workspace(parts.rule)
            readonly property string path: page.found[modelData.index] ?? "?"
            // What a search hit scrolls to (AutostartModule's searchItems key).
            objectName: modelData.cmd
            width: page.width
            height: 44

            Switch {
                id: sw
                anchors { left: parent.left; verticalCenter: parent.verticalCenter }
                checked: row.modelData.enabled
                onToggled: page.apply(A.toggle(fv.text(), row.modelData))
            }

            Text {
                id: cmdText
                anchors { left: sw.right; leftMargin: 10; right: del.left; rightMargin: 8; top: parent.top; topMargin: 4 }
                elide: Text.ElideMiddle
                text: row.parts.body
                color: row.modelData.enabled ? Theme.text : Theme.subtext
                font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 3 }
            }

            Small {
                anchors { left: cmdText.left; right: cmdText.right; top: cmdText.bottom; topMargin: 2 }
                elide: Text.ElideRight
                color: row.path === "" ? Theme.red : Theme.subtext
                text: [row.path === "" ? "not found: " + A.program(row.modelData.cmd, page.home) : "",
                       row.where === null ? "[" + row.parts.rule + "]"
                       : row.where.ws ? "workspace " + row.where.ws + (row.where.silent ? ", silent" : "") : ""]
                      .filter(s => s).join("  ·  ")
            }

            Button {
                id: del
                anchors { right: parent.right; verticalCenter: parent.verticalCenter }
                text: page.confirming === row.modelData.index ? "Confirm" : "Remove"
                danger: true
                onClicked: {
                    if (page.confirming === row.modelData.index)
                        page.apply(A.remove(fv.text(), row.modelData));
                    else
                        page.confirming = row.modelData.index;
                }
            }
        }
    }

    // --- add ---

    Text {
        topPadding: 14
        text: "Add"
        font { family: Theme.fontFamily; pixelSize: Theme.fontSize; bold: true }
        color: Theme.text
    }

    Flow {
        width: parent.width
        spacing: 6
        Chip { text: "Installed app"; selected: page.picking; onClicked: { page.picking = true; page.newCmd = ""; } }
        Chip { text: "Command"; selected: !page.picking; onClicked: { page.picking = false; page.newCmd = ""; page.pickedName = ""; } }
    }

    // The picker: search, then click an app to take its Exec line.
    Field {
        visible: page.picking
        width: parent.width
        placeholder: "search apps"
        text: page.query
        onEdited: t => page.query = t
    }

    Repeater {
        model: page.picking ? page.apps : []

        delegate: Rectangle {
            id: app
            required property var modelData
            readonly property bool selected: page.pickedName === modelData.name
            width: page.width
            height: 32
            radius: 8
            color: selected ? Qt.alpha(Theme.accent, 0.22)
                 : appArea.containsMouse ? Qt.alpha(Theme.text, 0.06) : "transparent"

            Image {
                id: appIcon
                anchors { left: parent.left; leftMargin: 8; verticalCenter: parent.verticalCenter }
                width: 20; height: 20
                sourceSize: Qt.size(20, 20)
                source: Quickshell.iconPath(app.modelData.icon, true)
            }
            Text {
                anchors { left: appIcon.right; leftMargin: 10; right: parent.right; rightMargin: 8; verticalCenter: parent.verticalCenter }
                elide: Text.ElideRight
                text: app.modelData.name + "   " + A.fromExec(app.modelData.execString)
                color: Theme.text
                font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 3 }
            }
            MouseArea {
                id: appArea
                anchors.fill: parent
                hoverEnabled: true
                cursorShape: Qt.PointingHandCursor
                onClicked: {
                    page.pickedName = app.modelData.name;
                    page.newCmd = A.fromExec(app.modelData.execString);
                }
            }
        }
    }

    // The command, typed, or picked and then adjustable.
    Field {
        visible: !page.picking || page.pickedName !== ""
        width: parent.width
        placeholder: "command, e.g. nm-applet --indicator"
        text: page.newCmd
        onEdited: t => page.newCmd = t
        onAccepted: page.add()
    }

    Small {
        visible: page.newFound !== ""
        width: parent.width
        elide: Text.ElideMiddle
        color: page.newFound === "-" ? Theme.red : page.newFound === "?" ? Theme.subtext : Theme.green
        text: page.newFound === "?" ? "checking…"
            : page.newFound === "-" ? "not found on PATH: " + A.program(page.newCmd, page.home)
            : "found: " + page.newFound
    }

    Small { topPadding: 6; text: "Workspace" }

    Flow {
        width: parent.width
        spacing: 6
        Chip { text: "Current"; selected: page.newWs === ""; onClicked: page.newWs = "" }
        Repeater {
            model: page.workspaces
            Chip {
                required property string modelData
                text: modelData === "special" ? "scratchpad" : modelData.replace(/^special:/, "")
                selected: page.newWs === modelData
                onClicked: page.newWs = modelData
            }
        }
    }

    // Silent: the window goes to its workspace without switching to it.
    Item {
        width: parent.width
        height: 32
        opacity: page.newWs !== "" ? 1 : 0.45
        Switch {
            id: silent
            anchors { left: parent.left; verticalCenter: parent.verticalCenter }
            enabled: page.newWs !== ""
            checked: page.newSilent
            onToggled: page.newSilent = checked
        }
        Small {
            anchors { left: silent.right; leftMargin: 10; verticalCenter: parent.verticalCenter }
            text: "Silent: open there without switching to it"
        }
    }

    Item {
        width: parent.width
        height: 34

        Small {
            anchors { left: parent.left; right: tryBtn.left; rightMargin: 8; verticalCenter: parent.verticalCenter }
            elide: Text.ElideMiddle
            text: page.newCmd.trim() ? page.composed : ""
        }
        Button {
            id: tryBtn
            anchors { right: addBtn.left; rightMargin: 6; verticalCenter: parent.verticalCenter }
            text: "Try"
            enabled: page.addable
            onClicked: page.run(page.composed)
        }
        Button {
            id: addBtn
            anchors { right: parent.right; verticalCenter: parent.verticalCenter }
            text: "Add"
            enabled: page.addable
            onClicked: page.add()
        }
    }
}