// The develop view's own chrome: the strip across the top of the window and
// the capture-metadata block in the column beside the canvas.
//
// Split out of `app.slint`, where they sat above `AppWindow` and were read as
// part of the application shell. They are not: neither is instantiated
// anywhere but the develop view, and the shell's job — choosing which of the
// five screens is up — is easier to read without two unrelated components in
// front of it.

import { Theme } from "theme.slint";
import { Button, PanelHeading, Label, Value, Caption, Panel } from "widgets.slint";

// Status strip — surfaces the GPU backend and adapter, which matters during
// v0.1 because assumption A1 is exactly "does this compositing path work on
// this hardware". Seeing the adapter at a glance makes vendor differences
// obvious during the S1/S2 spikes.
export component StatusBar inherits Rectangle {
    in property <string> adapter;
    in property <string> backend;
    in property <string> layout-class;
    in property <int> fps;
    /// FR-UI-1: the layout class, so the instrumentation can stand down on a
    /// strip too narrow to carry both it and the controls.
    in property <bool> expanded: true;
    in property <string> filename;
    in property <string> position;
    /// Only offered where there is a library to go back to — with files named
    /// on the command line there is no grid behind this view.
    in property <bool> can-return-to-library: false;
    /// Whether the develop column is currently shown, for the toggle's label.
    in property <bool> panel-visible: true;
    /// What the export button says. Rust owns it because the answer depends
    /// on settings this component does not see — the format, and whether the
    /// destination is this device or the server.
    in property <string> export-label: "Export";
    in property <bool> export-busy: false;
    /// What the last export did. Sits beside the button rather than in a
    /// dialogue: an export that succeeded needs no acknowledging, and one
    /// that failed needs its reason where the retry is.
    in property <string> export-status;
    /// Whether the edit can be stepped either way (FR-DEV-5).
    in property <bool> can-undo: false;
    in property <bool> can-redo: false;

    callback back-to-library();
    callback open-people();
    callback open-settings();
    callback toggle-panel();
    callback export-image();
    callback undo();
    callback redo();

    // 44px and `surface`, the same bar the library and settings draw.
    //
    // It was 28px — the control height — which was a reasonable size for a
    // readout and the wrong size for the thing it actually is: this strip
    // carries the only way out of develop, and it was half the height of the
    // identical control on the two screens either side of it. Three screens
    // whose headers do not agree read as three applications, and the one place
    // the user needs to find a way back was the one drawn smallest.
    //
    // Controls keep their own 28px and are centred in it, exactly as the
    // library header centres the same buttons: a `Button` sets a fixed height,
    // which a HorizontalLayout parks at the top of the row rather than
    // centring for it.
    height: 44px;
    background: Theme.surface;

    // Scrolls rather than overflowing. A layout given less width than its
    // children need does not shrink them — it overruns the edge and reports
    // the oversized minimum to whatever contains it. Collapsing the
    // instrumentation below buys back about 200 logical pixels, which is
    // enough for a tablet; it is not enough for a phone, and nothing here
    // should be unreachable merely because the window is narrow.
    Flickable {
        width: 100%;
        height: 100%;
        viewport-height: self.height;
        viewport-width: max(self.width, strip.preferred-width);

    strip := HorizontalLayout {
        width: parent.viewport-width;
        height: parent.viewport-height;
        padding-left: Theme.gap;
        padding-right: Theme.gap;
        spacing: Theme.gap;
        alignment: start;

        // Kept instantiated with `visible` rather than wrapped in an `if`:
        // the strip is inside the layout that `expanded` feeds, and adding a
        // conditional child here is the shape that has already caused binding
        // loops in this file (see the panel below).
        Button {
            text: "‹ Library";
            y: (parent.height - self.height) / 2;
            visible: root.can-return-to-library;
            clicked => { root.back-to-library(); }
        }

        // The third screen, reachable from the second. Beside the way back
        // because it is the same kind of move — leaving this photograph for
        // somewhere else in the library — and because a mode you can only
        // reach from one of the other two is not a peer of them, whatever the
        // navigation model says.
        Button {
            text: "Identity";
            y: (parent.height - self.height) / 2;
            visible: root.can-return-to-library;
            clicked => { root.open-people(); }
        }

        Value { text: root.filename; compact: true; overflow: elide; }

        Caption { text: root.position; }

        Rectangle { horizontal-stretch: 1; }

        // --- instrumentation lives in Settings now ------------------------
        //
        // The render backend, the layout class and the frame rate are
        // developer readouts. They cost about 200 logical pixels of a strip
        // that also carries the only way out of develop, the undo pair, the
        // panel toggle and the export button — and a `HorizontalLayout` given
        // less width than its children's minimums does not shrink them, it
        // runs off the end.
        //
        // A tablet in portrait is 768 logical pixels and was already below the
        // breakpoint that hid them, so it kept its header. Landscape is 1200
        // and is not, so the readouts came back and the header ran off the
        // right-hand edge there instead — a breakpoint that hides a problem at
        // one size and not another is a workaround, not a fix.
        //
        // The backend, the frame rate and the layout class used to live here.
        // They are diagnostics — read once when something looks wrong, and
        // never again — and as permanent furniture in a 44px strip they cost
        // three slots that the controls beside them actually needed. On a
        // tablet in landscape the header ran off the right-hand edge, and this
        // was a third of the reason.
        //
        // They are in Settings under ABOUT now, next to the version, which is
        // where someone goes when they have a bug to report rather than a
        // photograph to edit.

        // Undo and redo, in the strip rather than in the develop column: the
        // panel can be put away, and the one control that takes back a
        // mis-drag must not go away with it. Disabled rather than hidden, so
        // the pair keeps its place and the keyboard shortcut has something
        // visible to correspond to.
        Button {
            text: "Undo";
            enabled: root.can-undo;
            y: (parent.height - self.height) / 2;
            clicked => { root.undo(); }
        }

        Button {
            text: "Redo";
            enabled: root.can-redo;
            y: (parent.height - self.height) / 2;
            clicked => { root.redo(); }
        }

        // Show or hide the develop column. On a tablet the panel is 280px of a
        // screen that is mostly photograph, and the whole point of opening an
        // image is to look at it — so being able to put the instruments away
        // and bring them back is worth a control of its own. The glyph points
        // the way the panel will move.
        Button {
            text: root.panel-visible ? "Hide panel ›" : "‹ Panel";
            active: root.panel-visible;
            y: (parent.height - self.height) / 2;
            clicked => { root.toggle-panel(); }
        }

        Caption {
            text: root.export-status;
            vertical-alignment: center;
            overflow: elide;
        }

        // The export itself, beside the settings that shape it. This is the
        // screen where a photograph is finished, so it is the screen where
        // one is asked for — the grid can export a selection later, but a
        // single finished frame is exported from in front of it.
        Button {
            text: root.export-busy ? "Exporting…" : root.export-label;
            enabled: !root.export-busy;
            y: (parent.height - self.height) / 2;
            clicked => { root.export-image(); }
        }

        // Reachable from develop as well as from the grid: export defaults are
        // most likely to be wanted with a finished photograph on screen, which
        // is exactly where this bar is and the library header is not.
        Button {
            text: "Settings";
            y: (parent.height - self.height) / 2;
            clicked => { root.open-settings(); }
        }

    }
    }

    Rectangle {
        y: parent.height - 1px;
        height: 1px;
        background: Theme.rule;
    }
}

// Capture metadata. Read-only; the adjustment controls live in AdjustPanel,
// which is generated from pipeline capabilities rather than written here.
//
// Flat, like everything else in this column. This was briefly a collapsible
// section so that every panel could be put away; the sidebar as a whole now
// closes from the status strip instead, which is the control that was actually
// wanted, and the per-group lids only stood between the user and the controls.
export component InfoPanel inherits Rectangle {
    in property <string> camera;
    in property <string> exposure;
    in property <string> dimensions;

    /// TRACES: FR-UI-2
    /// How wide this panel has to be before it starts clipping itself. The
    /// develop column is the largest of these and nothing else; publishing it
    /// as `min-width` too is what makes the enclosing layout aggregate them
    /// without this panel having to be referenced by name.
    out property <length> content-width: panel.preferred-width;
    min-width: root.content-width;

    background: transparent;
    height: panel.preferred-height;

    panel := Panel {
        // Flat: this abuts the adjust panel below it and the rule between
        // them is drawn by the column that stacks the two.
        flat: true;
        width: 100%;

        PanelHeading { text: "IMAGE"; }

        Value {
            text: root.camera == "" ? "—" : root.camera;
            placeholder: root.camera == "";
            wrap: word-wrap;
        }

        Label { text: root.exposure; }

        Caption { text: root.dimensions; }
    }
}