// Right-side Lyrics panel.
//
// Rendered as a layout sibling of the content area (see AppShell), so it
// shrinks the content rather than overlaying it. The 280px column width is
// owned by AppShell (owner Q3: stays 280px; the typography adapts in
// LyricsLinesView instead). Closing sets ShellState.lyrics-open = false.
//
// 1:1 to the Tauri `LyricsSidebar.svelte` header/states (spec §3.1): 36px
// mic icon tile + LYRICS overline + "{title} - {artist}" meta + the
// display-settings trigger (S5 wires the LyricsControlsFlyout), plus the
// Slint-convention close button (deviation D4, homologated with Queue).
// Body renders by LyricsState.status: loading / no-lyrics / offline-miss
// (typed NotAvailableOffline, F3) / error / the shared lines view.

import { Theme } from "../foundation/semantic-colors.slint";
import { Spacing } from "../foundation/spacing.slint";
import { Typography } from "../foundation/typography.slint";
import { Radius } from "../foundation/radius.slint";
import { QbzIcon } from "../primitives/QbzIcon.slint";
import { LoadingSpinner } from "../primitives/LoadingSpinner.slint";
import { LyricsLinesView } from "LyricsLinesView.slint";
import { ShellState, LyricsState } from "../state.slint";

component CloseButton inherits Rectangle {
    callback clicked();
    width: 28px;
    height: 28px;
    border-radius: Radius.sm;
    background: ta.has-hover ? Theme.surface-hover : transparent;

    QbzIcon {
        source: @image-url("../assets/icons/x.svg");
        width: 15px;
        height: 15px;
        x: Math.round((parent.width - self.width) / 2 / 1px) * 1px;
        y: Math.round((parent.height - self.height) / 2 / 1px) * 1px;
        tint: ta.has-hover ? Theme.text-primary : Theme.text-secondary;
    }

    ta := TouchArea {
        mouse-cursor: pointer;
        clicked => {
            root.clicked();
        }
    }
}

// 32px icon button — the display-settings trigger (Tauri SlidersHorizontal,
// LyricsSidebar.svelte:38-66).
component HeaderIconButton inherits Rectangle {
    in property <image> icon;
    callback clicked();
    width: 32px;
    height: 32px;
    border-radius: Radius.sm;
    background: ta.has-hover ? Theme.surface-hover : transparent;

    QbzIcon {
        source: root.icon;
        width: 16px;
        height: 16px;
        x: Math.round((parent.width - self.width) / 2 / 1px) * 1px;
        y: Math.round((parent.height - self.height) / 2 / 1px) * 1px;
        tint: ta.has-hover ? Theme.text-primary : Theme.text-secondary;
    }

    ta := TouchArea {
        mouse-cursor: pointer;
        clicked => {
            root.clicked();
        }
    }
}

export component LyricsSidebar inherits Rectangle {
    // Width is owned by the right-panel column in AppShell; this fills it and
    // vertical-stretches to its share of the height (stacked under the queue).
    clip: true;
    background: Theme.surface-card;

    // Conditionally mounted (`if lyrics-open` at the AppShell mount site,
    // ADR-010) — re-request lyrics for the current track on every open.
    // Cache-served / no-op while already loaded (Tauri parity: load lands
    // immediately when opening mid-song, lyricsStore.ts:386-389).
    init => {
        LyricsState.panel-opened();
    }

    VerticalLayout {
        spacing: 0px;

        // Header: icon tile + overline/meta block + controls trigger + close.
        // Taller than the Queue header (56px vs 44px) to fit the Tauri
        // two-row title block + 36px tile (spec §3.1 rows 3-5).
        HorizontalLayout {
            padding-left: Spacing.sm;
            padding-right: Spacing.sm;
            padding-top: Spacing.sm;
            padding-bottom: Spacing.sm;
            height: 56px;
            spacing: Spacing.sm;

            // Icon tile — 36px, mic-vocal 18, accent tint.
            VerticalLayout {
                alignment: center;
                Rectangle {
                    width: 36px;
                    height: 36px;
                    border-radius: Radius.sm;
                    background: Theme.surface-elevated;
                    QbzIcon {
                        source: @image-url("../assets/icons/mic-vocal.svg");
                        width: 18px;
                        height: 18px;
                        x: Math.round((parent.width - self.width) / 2 / 1px) * 1px;
                        y: Math.round((parent.height - self.height) / 2 / 1px) * 1px;
                        tint: Theme.accent;
                    }
                }
            }

            // Title block: overline + playing-track meta.
            VerticalLayout {
                alignment: center;
                spacing: 2px;
                horizontal-stretch: 1;
                Text {
                    // GroupHeader overline per the alignment standard (ALL-CAPS
                    // 11px / 1.5px letter-spacing — deviation D8 vs Tauri's
                    // 12px/0.1em, forced by the binding standard).
                    text: @tr("LYRICS");
                    color: Theme.text-muted;
                    font-size: 11px;
                    font-weight: Typography.semibold;
                    letter-spacing: 1.5px;
                }
                if LyricsState.track-title != "": Text {
                    text: LyricsState.track-title + " - " + LyricsState.track-artist;
                    color: Theme.text-secondary;
                    font-size: 12px;
                    overflow: elide;
                }
            }

            // Display-settings trigger — the LyricsControlsFlyout lands in S5.
            VerticalLayout {
                alignment: center;
                HeaderIconButton {
                    icon: @image-url("../assets/icons/sliders-horizontal.svg");
                }
            }
            VerticalLayout {
                alignment: center;
                CloseButton {
                    clicked => {
                        ShellState.lyrics-open = false;
                    }
                }
            }
        }
        Rectangle {
            height: 1px;
            background: Theme.border-subtle;
        }

        // Body — by LyricsState.status.
        Rectangle {
            vertical-stretch: 1;
            clip: true;

            // Loading: 24px spinner + label (Tauri LyricsSidebar.svelte:68-92).
            if LyricsState.status == 1: VerticalLayout {
                alignment: center;
                spacing: 10px;
                padding: Spacing.md;
                HorizontalLayout {
                    alignment: center;
                    LoadingSpinner {
                        size: 24px;
                    }
                }
                Text {
                    text: @tr("Fetching lyrics...");
                    color: Theme.text-muted;
                    font-size: Typography.legal;
                    horizontal-alignment: center;
                }
            }

            // No lyrics — idle, not-found, or a ready result that parsed to
            // zero lines.
            if LyricsState.status == 0
                || LyricsState.status == 3
                || (LyricsState.status == 2 && LyricsState.lines.length == 0): VerticalLayout {
                alignment: center;
                padding: Spacing.md;
                Text {
                    text: @tr("No lyrics available");
                    color: Theme.text-muted;
                    font-size: Typography.legal;
                    horizontal-alignment: center;
                    wrap: word-wrap;
                }
            }

            // Offline with nothing cached — the typed NotAvailableOffline
            // outcome (F3: a translated string, never hardcoded EN).
            if LyricsState.status == 5: VerticalLayout {
                alignment: center;
                padding: Spacing.md;
                Text {
                    text: @tr("Lyrics unavailable offline");
                    color: Theme.text-muted;
                    font-size: Typography.legal;
                    horizontal-alignment: center;
                    wrap: word-wrap;
                }
            }

            // Error — surfaced backend text, standard error tone.
            if LyricsState.status == 4: VerticalLayout {
                alignment: center;
                padding: Spacing.md;
                Text {
                    text: LyricsState.error;
                    color: #e0564f;
                    font-size: Typography.legal;
                    horizontal-alignment: center;
                    wrap: word-wrap;
                }
            }

            // Lyrics body — the shared lines renderer.
            if LyricsState.status == 2 && LyricsState.lines.length > 0: LyricsLinesView {
                width: 100%;
                height: 100%;
            }
        }
    }
}