// 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 "Hypr.js" as H

// One row per live bind: the combo as keycaps, what it does (its
// description, then the action as the Lua source writes it), and where it is
// set. Clicking a row opens its combo for editing when the source writes it
// as a plain string; one built at run time (a loop) says where to change it.
// Source shows the files that hold binds, Clashes the combos bound twice.
Column {
    id: page

    required property QtObject mod
    property string tab: "list"
    property string query: ""
    // The mod.rows index being edited, -1 for none.
    property int editing: -1
    property string draft: ""
    property string error: ""
    property bool busy: false

    spacing: 10

    readonly property var shown: {
        const q = page.query.trim().toLowerCase();
        const out = [];
        page.mod.rows.forEach((r, i) => {
            const hay = r.keys.join(" + ") + " " + r.desc + " " + (r.src ? r.src.action + " " + r.src.file : "");
            if (q === "" || hay.toLowerCase().includes(q)) out.push({ r: r, i: i });
        });
        return out;
    }
    readonly property var clashes: H.clashes(page.mod.rows)
        .reduce((a, g) => a.concat(g.map(r => ({ r: r, i: page.mod.rows.indexOf(r) }))), [])

    // Other binds already on the combo being typed, in the same submap.
    readonly property var draftClash: {
        const c = H.parseCombo(page.draft);
        const me = page.mod.rows[page.editing];
        if (!c || !me) return [];
        return page.mod.rows.filter(r => r !== me && r.bind.submap === me.bind.submap
                                         && r.bind.modmask === c.mask && r.bind.key.toLowerCase() === c.key.toLowerCase());
    }

    // The files holding binds, each line numbered. Reads mod.rows so it
    // recomputes when a file is reloaded.
    readonly property var sourceFiles: {
        const used = [];
        for (const r of page.mod.rows) if (r.src && !used.includes(r.src.file)) used.push(r.src.file);
        return page.mod.files.filter(f => used.includes(f)).map(f => ({
            file: f,
            text: (page.mod.texts[f] ?? "").replace(/\n$/, "").split("\n").map((l, i) => String(i + 1).padStart(4) + "  " + l).join("\n")
        }));
    }

    function toggle(i) {
        page.error = "";
        if (page.editing === i) { page.editing = -1; return; }
        page.editing = i;
        const r = page.mod.rows[i];
        page.draft = r.src && r.src.key !== null ? r.src.key : "";
    }

    function save() {
        if (page.busy || page.editing < 0) return;
        page.busy = true;
        page.error = "";
        page.mod.rebind(page.mod.rows[page.editing], page.draft, err => {
            page.busy = false;
            page.error = err;
            if (err === "") page.editing = -1;
        });
    }

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

    component Keycap: Rectangle {
        property alias text: capLabel.text
        width: capLabel.implicitWidth + 10
        height: 22
        radius: 4
        color: Theme.surfaceAlt
        Text {
            id: capLabel
            anchors.centerIn: parent
            color: Theme.text
            font { family: Theme.iconFamily; pixelSize: Theme.fontSize - 4; bold: true }
        }
    }

    component BindRow: Column {
        id: br
        required property var row
        required property int idx
        readonly property bool open: page.editing === br.idx
        readonly property bool editable: br.row.src !== null && br.row.src.key !== null
        objectName: "bind:" + br.idx
        onOpenChanged: if (open && editable) comboField.focusIn()
        width: page.width
        spacing: 6

        Item {
            width: parent.width
            height: 46

            Rectangle {
                anchors.fill: parent
                radius: 6
                color: rowArea.containsMouse || br.open ? Qt.alpha(Theme.accent, 0.12) : "transparent"
            }

            Row {
                x: 8
                width: parent.width * 0.3 - 16
                anchors.verticalCenter: parent.verticalCenter
                spacing: 4
                clip: true
                Repeater {
                    model: br.row.keys
                    Row {
                        required property string modelData
                        required property int index
                        spacing: 4
                        Text {
                            visible: index > 0
                            anchors.verticalCenter: parent.verticalCenter
                            text: "+"
                            color: Theme.subtext
                            font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
                        }
                        Keycap { text: modelData }
                    }
                }
            }

            Column {
                x: parent.width * 0.3
                width: parent.width * 0.5 - 12
                anchors.verticalCenter: parent.verticalCenter
                Text {
                    width: parent.width
                    text: br.row.desc !== "" ? br.row.desc : "No description"
                    color: br.row.desc !== "" ? Theme.text : Theme.subtext
                    elide: Text.ElideRight
                    font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 3 }
                }
                Text {
                    width: parent.width
                    visible: br.row.src !== null
                    text: br.row.src ? br.row.src.action : ""
                    color: Theme.blue
                    elide: Text.ElideRight
                    font { family: Theme.iconFamily; pixelSize: Theme.fontSize - 4 }
                }
            }

            Small {
                x: parent.width * 0.8
                width: parent.width * 0.2 - 8
                anchors.verticalCenter: parent.verticalCenter
                text: br.row.src ? br.row.src.file.replace(/^sections\//, "") + ":" + br.row.src.line : "outside the config"
            }

            MouseArea {
                id: rowArea
                anchors.fill: parent
                hoverEnabled: true
                cursorShape: Qt.PointingHandCursor
                onClicked: page.toggle(br.idx)
            }
        }

        Column {
            visible: br.open
            x: 8
            width: parent.width - 16
            spacing: 6
            bottomPadding: 8

            Small {
                width: parent.width
                visible: !br.editable
                wrapMode: Text.Wrap
                text: br.row.src
                    ? "Built at run time, " + br.row.src.keyExpr + " in " + br.row.src.file + " line " + br.row.src.line + ". Change it there."
                    : "No hl.bind call in the config files made this one: a plugin or hyprctl did."
            }

            Item {
                visible: br.editable
                width: parent.width
                height: 32
                Field {
                    id: comboField
                    anchors { left: parent.left; right: saveBtn.left; rightMargin: 8 }
                    mono: true
                    text: page.draft
                    placeholder: "SUPER + SHIFT + q"
                    onEdited: t => page.draft = t
                    onAccepted: page.save()
                }
                Button {
                    id: saveBtn
                    anchors { right: cancelBtn.left; rightMargin: 6; verticalCenter: parent.verticalCenter }
                    text: page.busy ? "Checking…" : "Save"
                    enabled: !page.busy && page.draft.trim() !== "" && page.draft.trim() !== br.row.src?.key
                    onClicked: page.save()
                }
                Button {
                    id: cancelBtn
                    anchors { right: parent.right; verticalCenter: parent.verticalCenter }
                    text: "Cancel"
                    onClicked: page.toggle(br.idx)
                }
            }

            Small {
                width: parent.width
                visible: br.editable && page.draftClash.length > 0
                wrapMode: Text.Wrap
                color: Theme.yellow
                text: "Already bound: " + page.draftClash.map(r => r.desc || r.src?.action || "?").join(", ") + ". Saving keeps both."
            }
            Small {
                width: parent.width
                visible: br.editable && page.error !== ""
                wrapMode: Text.Wrap
                color: Theme.red
                text: page.error
            }
            Small {
                width: parent.width
                visible: br.editable
                wrapMode: Text.Wrap
                text: "Hyprland checks the combo first. Saving rewrites line " + (br.row.src?.line ?? "") + " of "
                    + (br.row.src?.file ?? "") + ", and Hyprland reloads."
            }
        }
    }

    Small {
        width: parent.width
        text: page.mod.rows.length + " bindings, live from Hyprland."
    }

    Item {
        width: parent.width
        height: 32
        Row {
            id: tabs
            spacing: 6
            anchors.verticalCenter: parent.verticalCenter
            Chip { text: "List"; selected: page.tab === "list"; onClicked: page.tab = "list" }
            Chip { text: "Source"; selected: page.tab === "source"; onClicked: page.tab = "source" }
            Chip {
                text: "Clashes · " + H.clashes(page.mod.rows).length
                selected: page.tab === "clashes"
                onClicked: page.tab = "clashes"
            }
        }
        Field {
            visible: page.tab === "list"
            anchors { left: tabs.right; leftMargin: 12; right: parent.right }
            text: page.query
            placeholder: "Search keys, actions and files"
            onEdited: t => page.query = t
        }
    }

    Item {
        visible: page.tab !== "source"
        width: parent.width
        height: 20
        Small { x: 8; text: "Keys" }
        Small { x: parent.width * 0.3; text: "Does" }
        Small { x: parent.width * 0.8; text: "Set at" }
    }

    Repeater {
        model: page.tab === "list" ? page.shown : page.tab === "clashes" ? page.clashes : []
        BindRow {
            required property var modelData
            row: modelData.r
            idx: modelData.i
        }
    }

    Small {
        width: parent.width
        visible: page.tab === "clashes" && page.clashes.length === 0
        text: "No combo is bound twice."
    }

    Repeater {
        model: page.tab === "source" ? page.sourceFiles : []
        Column {
            required property var modelData
            width: page.width
            spacing: 4
            Text {
                text: modelData.file
                color: Theme.text
                font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2; bold: true }
            }
            TextEdit {
                width: parent.width
                readOnly: true
                selectByMouse: true
                textFormat: TextEdit.PlainText
                wrapMode: TextEdit.NoWrap
                clip: true
                text: modelData.text
                color: Theme.text
                selectionColor: Qt.alpha(Theme.accent, 0.4)
                font { family: Theme.iconFamily; pixelSize: Theme.fontSize - 4 }
            }
        }
    }
}