import { type Component, createMemo, For, Show } from "solid-js";
import { type Task, calculateUrgencyFromDate, setActiveTaskId, store, copyTask, updateTask, currentTaskContext, now, getFavoriteTag, isCurrentUserContextTag, dismissTaskUpdateIndicator, isTaskUpdatedByAnotherUser, collapseTaskUntilUpdated, expandCollapsedTask, isTaskCollapsedUntilUpdated, isTaskCollaborativelyShared } from "@/store";
import { cn } from "@/lib/utils";
import { Clock, ArrowUpCircle, Copy, Users2, Star, ChevronRight } from "lucide-solid";
import { Badge } from "@/components/ui/badge";
import { useTheme } from "./ThemeProvider";
import { getThemeAdjustedColor } from "@/lib/colors";
import { Select, SelectContent, SelectItem, SelectTrigger } from "@/components/ui/select";
import { getStatusOptionsForTask } from "@/lib/constants";
import { getRecurrenceProgress } from "@/lib/recurrence";
import { buildShareTag } from "@/lib/tags";
import { StatusCircle } from "./StatusCircle";

export const TaskCard: Component<{ task: Task, isShaking?: boolean }> = (props) => {
    const { resolvedTheme } = useTheme();
    const urgencyLevel = createMemo(() => calculateUrgencyFromDate(props.task.dueDate));

    const urgencyColor = () => {
        const u = urgencyLevel();
        if (u >= 8) return "text-red-500";
        if (u >= 6) return "text-orange-500";
        if (u >= 4) return "text-blue-500";
        return "text-muted-foreground";
    };

    const formattedDate = () => {
        const date = new Date(props.task.dueDate);
        return date.toLocaleDateString(undefined, { month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit' });
    };

    // Filter out bucket tags if we are currently INSIDE that bucket view
    const visibleTags = createMemo(() => {
        const tags = props.task.tags || [];
        const ctx = currentTaskContext();

        if (typeof ctx === 'object' && 'bucketId' in ctx) {
            const bucketContext = store.contexts.find(context => context.id === ctx.bucketId);
            const bucketTagName = buildShareTag(bucketContext?.displayName || ctx.name).toLowerCase();
            return tags.filter(t => t.toLowerCase() !== bucketTagName && !t.endsWith("_favorite__") && !isCurrentUserContextTag(t));
        }

        return tags.filter(t => !t.endsWith("_favorite__") && !isCurrentUserContextTag(t));
    });

    const isDueWithin12Hours = createMemo(() => {
        if (!props.task.dueDate) return false;
        try {
            const dueMs = new Date(props.task.dueDate).getTime();
            const diffMs = dueMs - now();
            const twelveHoursMs = 12 * 60 * 60 * 1000;
            return Math.abs(diffMs) <= twelveHoursMs;
        } catch {
            return false;
        }
    });

    const canCollapseUntilUpdated = createMemo(() => isTaskCollaborativelyShared(props.task));
    const statusOptions = createMemo(() => {
        const baseOptions = getStatusOptionsForTask(props.task.recurrence);
        if (!canCollapseUntilUpdated()) return baseOptions;
        return [
            ...baseOptions,
            { value: "__collapse_until_updated__", label: "Collapse until updated" }
        ];
    });
    const recurrenceProgress = createMemo(() => {
        if (props.task.status !== 10) return null;
        return getRecurrenceProgress(props.task.recurrence, props.task.updated, now());
    });
    const shouldQuickloadFade = createMemo(() => store.quickloadFadeTaskIds.includes(props.task.id));
    const showUpdateIndicator = createMemo(() => isTaskUpdatedByAnotherUser(props.task));
    const isCollapsed = createMemo(() => isTaskCollapsedUntilUpdated(props.task));

    return (
        <div
            class={cn(
                "group relative flex items-center bg-card border border-border rounded-2xl transition-[background-color,border-color,box-shadow,opacity] duration-500 hover:duration-100 hover:shadow-xl hover:shadow-primary/5 hover:-translate-y-0.5 cursor-pointer w-full min-w-0 overflow-hidden",
                isCollapsed()
                    ? "py-1.5 pl-5 pr-5 sm:py-2 sm:pl-6 sm:pr-6"
                    : "py-3 pl-6 pr-6 sm:py-4 sm:pl-7 sm:pr-7",
                props.task.completed && "opacity-60",
                props.isShaking && "animate-task-shake bg-accent/20",
                shouldQuickloadFade() && "animate-task-quickload-fade"
            )}
            onClick={() => setActiveTaskId(props.task.id)}
        >
            {/* Today indicator */}
            <Show when={isDueWithin12Hours() && !props.task.completed}>
                <div class="absolute left-0 top-3 bottom-3 w-3 sm:w-[0.875rem] rounded-r-md bg-primary/65 text-primary-foreground/90">
                    <span
                        class="absolute inset-0 flex items-center justify-center text-[0.4375rem] sm:text-[0.5rem] font-semibold uppercase tracking-[0.08em] [writing-mode:vertical-rl] [text-orientation:mixed]"
                    >
                        Today
                    </span>
                </div>
            </Show>
            <Show when={showUpdateIndicator()}>
                <button
                    type="button"
                    class="absolute right-0 top-3 bottom-3 w-3 sm:w-[0.875rem] rounded-l-md bg-primary/65 text-primary-foreground/90 transition-colors hover:bg-primary/80 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/30"
                    title="Hide updates until the next change from another user"
                    onClick={(e) => {
                        e.stopPropagation();
                        dismissTaskUpdateIndicator(props.task.id, props.task.updated);
                    }}
                >
                    <span
                        class="absolute inset-0 flex items-center justify-center text-[0.4375rem] sm:text-[0.5rem] font-semibold uppercase tracking-[0.08em] [writing-mode:vertical-rl] [text-orientation:mixed]"
                    >
                        Updates
                    </span>
                </button>
            </Show>
            {/* Status Dropdown */}
            <Show when={!isCollapsed()}>
                <div class="mr-2 sm:mr-3 shrink-0" onClick={(e) => e.stopPropagation()}>
                    <Select<any>
                        value={(props.task.status ?? 0).toString()}
                        onChange={(val: any) => {
                            const value = typeof val === 'object' ? val?.value : val;
                            if (!value) return;
                            if (value === "__collapse_until_updated__") {
                                collapseTaskUntilUpdated(props.task.id, props.task.updated);
                                return;
                            }

                            const s = parseInt(value);
                            if (!isNaN(s)) updateTask(props.task.id, { status: s });
                        }}
                        options={statusOptions()}
                        optionValue="value"
                        optionTextValue="label"
                        placeholder="Status"
                        itemComponent={(props: any) => <SelectItem item={props.item}>{props.item.rawValue.label}</SelectItem>}
                    >
                        <SelectTrigger
                            class="h-9 w-9 p-0 bg-transparent border-transparent hover:bg-muted/50 data-[expanded]:bg-muted/50 shadow-none focus:ring-0 shrink-0 overflow-hidden flex items-center justify-center [&>svg]:hidden"
                            onDoubleClick={(e: MouseEvent) => {
                                e.preventDefault();
                                e.stopPropagation();
                                updateTask(props.task.id, { status: 10 });
                            }}
                        >
                            <StatusCircle status={props.task.status ?? 0} size={26} recurrenceProgress={recurrenceProgress()} />
                        </SelectTrigger>
                        <SelectContent />
                    </Select>
                </div>
            </Show>

            <div class={cn("flex-1 min-w-0", isCollapsed() ? "flex items-center justify-between gap-2" : "flex flex-col")}>
                <Show
                    when={isCollapsed()}
                    fallback={
                        <>
                <h3 class={cn(
                    "text-sm sm:text-base font-semibold truncate transition-all",
                    props.task.completed && "line-through"
                )}>
                    {props.task.title}
                </h3>
                {props.task.content && (
                    <div class="text-[0.6875rem] sm:text-xs text-muted-foreground/60 line-clamp-1 mt-1 leading-tight whitespace-pre">
                        {(() => {
                            let html = props.task.content || "";
                            // Replace block tags with newlines first to preserve structure
                            html = html.replace(/<\/p>/gi, '\n')
                                .replace(/<\/div>/gi, '\n')
                                .replace(/<br\s*\/?>/gi, '\n')
                                .replace(/<\/li>/gi, '\n')
                                .replace(/<\/h[1-6]>/gi, '\n');

                            const tmp = document.createElement("DIV");
                            tmp.innerHTML = html;
                            const text = tmp.textContent || tmp.innerText || "";

                            // Replace newlines (and surrounding whitespace) with a wide gap
                            // Using 5 non-breaking spaces worth of visual space
                            return text.trim().replace(/\s*[\r\n]+\s*/g, '     ');
                        })()}
                    </div>
                )}
                <div class="flex flex-wrap items-center gap-x-3 gap-y-1.5 mt-1 min-w-0">
                    {/* Priority */}
                    <div class="flex items-center gap-1.5 shrink-0">
                        <ArrowUpCircle size={12} class="text-primary opacity-60" />
                        <span class="text-[0.625rem] font-medium">P{props.task.priority}</span>
                    </div>

                    {/* Shared Indicator - driven by @tag share contexts */}
                    {(() => {
                        if (props.task.shareRefs.length === 0) return null;

                        const tooltip = props.task.shareRefs.length === 1
                            ? 'Shared via 1 @context'
                            : `Shared via ${props.task.shareRefs.length} @contexts`;

                        return (
                            <div class="flex items-center gap-1 shrink-0" title={tooltip}>
                                <Users2 size={11} class="text-muted-foreground/50" />
                            </div>
                        );
                    })()}

                    {/* Tags */}
                    {visibleTags().length > 0 && (
                        <div class="flex flex-wrap items-center gap-1 min-w-0">
                            <For each={visibleTags()}>
                                {(tag) => (
                                    <Badge
                                        variant="secondary"
                                        class="h-4 px-1.5 text-[0.5625rem] gap-1 bg-muted/50 border-border/50 shrink-0"
                                        style={{
                                            "background-color": (() => {
                                                const def = store.tagDefinitions.find(d => d.name === tag);
                                                const color = getThemeAdjustedColor(def?.color, def?.theme, resolvedTheme());
                                                return color ? `${color}15` : undefined;
                                            })(),
                                            "border-color": (() => {
                                                const def = store.tagDefinitions.find(d => d.name === tag);
                                                const color = getThemeAdjustedColor(def?.color, def?.theme, resolvedTheme());
                                                return color ? `${color}30` : undefined;
                                            })(),
                                            "color": (() => {
                                                const def = store.tagDefinitions.find(d => d.name === tag);
                                                return getThemeAdjustedColor(def?.color, def?.theme, resolvedTheme()) || "inherit";
                                            })()
                                        }}
                                    >
                                        <div
                                            class="w-1 h-1 rounded-full"
                                            style={{
                                                "background-color": (store.tagDefinitions.find(d => d.name === tag)?.value ?? 5) > 5 ? "#22c55e" : (store.tagDefinitions.find(d => d.name === tag)?.value ?? 5) < 5 ? "#ef4444" : "#94a3b8"
                                            }}
                                        />
                                        {tag}
                                    </Badge>
                                )}
                            </For>
                        </div>
                    )}

                    {/* Due Date + Urgency Slide-out */}
                    <div class="relative group/date flex items-center h-5 cursor-help shrink-0 min-w-0">
                        {/* Due Date - Static Layer on Top */}
                        <div class="flex items-center space-x-1 text-[0.5625rem] font-bold text-muted-foreground uppercase tracking-wider bg-card relative z-20 pr-1">
                            <Clock size={11} class="text-primary/60" />
                            <span class="truncate">{formattedDate()}</span>
                        </div>

                        {/* Urgency Number - Slides out from behind with fade */}
                        <div class={cn(
                            "absolute left-4 top-0 bottom-0 flex items-center transition-all duration-300 ease-out z-10 opacity-0 group-hover/date:opacity-100 group-hover/date:left-full whitespace-nowrap",
                            urgencyColor()
                        )}>
                            <span class="text-[0.5625rem] font-bold ml-2 transition-all duration-300 transform translate-x-[-8px] group-hover/date:translate-x-0 group-hover/date:blur-none blur-[2px]">
                                Urgency {urgencyLevel()}
                            </span>
                        </div>
                    </div>
                </div>
                        </>
                    }
                >
                    <h3 class={cn(
                        "text-[0.6875rem] sm:text-xs font-semibold truncate text-muted-foreground/90",
                        props.task.completed && "line-through"
                    )}>
                        {props.task.title}
                    </h3>
                    <button
                        type="button"
                        class="shrink-0 rounded-full p-1 text-muted-foreground/70 transition-colors hover:bg-muted hover:text-foreground"
                        title="Expand task"
                        onClick={(e) => {
                            e.stopPropagation();
                            expandCollapsedTask(props.task.id);
                        }}
                    >
                        <ChevronRight size={14} />
                    </button>
                </Show>
            </div>

            <Show when={!isCollapsed()}>
                <div class="ml-2 sm:ml-4 shrink-0 flex items-center gap-1">
                <button
                    class="p-1.5 hover:bg-muted rounded-full transition-all text-muted-foreground hover:text-primary opacity-0 group-hover:opacity-100"
                    onClick={(e) => {
                        e.stopPropagation();
                        copyTask(props.task.id);
                    }}
                    title="Duplicate Task"
                >
                    <Copy size={16} />
                </button>
                <button
                    class={cn(
                        "p-1.5 rounded-full transition-all",
                        props.task.tags?.includes(getFavoriteTag())
                            ? "text-amber-500 bg-amber-500/10 hover:bg-amber-500/20 opacity-100"
                            : "text-muted-foreground hover:text-amber-500 hover:bg-muted opacity-0 group-hover:opacity-100"
                    )}
                    onClick={(e) => {
                        e.stopPropagation();
                        const favTag = getFavoriteTag();
                        const currentTags = props.task.tags || [];
                        const isFav = currentTags.includes(favTag);
                        const newTags = isFav ? currentTags.filter(t => t !== favTag) : [...currentTags, favTag];
                        updateTask(props.task.id, { tags: newTags });
                    }}
                    title="Toggle Favorite"
                >
                    <Star size={16} class={cn(props.task.tags?.includes(getFavoriteTag()) && "fill-amber-500")} />
                </button>
                </div>
            </Show>
        </div>
    );
};