// modules/admin/pages/advertisements/ViewAdvertisement.jsx

import { useEffect, useState } from "react";
import { useNavigate, useParams } from "react-router-dom";
import { House, Edit, ArrowLeft, Megaphone, MousePointerClick, ExternalLink } from "lucide-react";

import { useAdvertisements } from "@/contexts/AdminAdvertisementContext";
import AppBreadcrumb from "@/components/generic/Breadcrumb/AppBreadcrumb";
import { useDateFormat } from "@/hooks/useDateFormat";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { Spinner } from "@/components/ui/spinner";

import { ADVERTISEMENT_TYPE_MAP, ADVERTISEMENT_STATUS_MAP } from "@/data/advertisement.data";

// ─── Helpers ────────────────────────────────────────────────────────────────

function SectionCard({ title, description, children }) {
    return (
        <div className="rounded-lg border bg-card p-6 space-y-4">
            {(title || description) && (
                <div className="space-y-0.5 pb-1 border-b">
                    {title       && <h2 className="text-sm font-semibold">{title}</h2>}
                    {description && <p className="text-xs text-muted-foreground">{description}</p>}
                </div>
            )}
            {children}
        </div>
    );
}

function Field({ label, children }) {
    return (
        <div>
            <p className="text-xs text-muted-foreground mb-0.5">{label}</p>
            <div className="text-sm">{children}</div>
        </div>
    );
}

// ─── Page ───────────────────────────────────────────────────────────────────

export default function ViewAdvertisement() {
    const navigate = useNavigate();
    const { advertisementId } = useParams();
    const { fetchAdvertisement, loading } = useAdvertisements();
    const { fmtDateTime } = useDateFormat();

    const [advertisement, setAdvertisement] = useState(null);

    useEffect(() => {
        (async () => {
            const res = await fetchAdvertisement(advertisementId);
            setAdvertisement(res?.data?.data ?? null);
        })();
        // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [advertisementId]);

    const breadcrumbItems = [
        { label: "Home", icon: <House className="size-4" />, to: "/admin" },
        { label: "Advertisements", to: "/admin/advertisements" },
        { label: "View" },
    ];

    if (loading && !advertisement) {
        return (
            <section className="bg-muted h-full">
                <div className="flex items-center justify-center py-32">
                    <Spinner className="size-6" />
                </div>
            </section>
        );
    }

    if (!advertisement) {
        return (
            <section className="bg-muted h-full">
                <div className="lg:container lg:mx-auto lg:px-0 flex flex-col items-start px-4">
                    <div className="flex flex-col gap-2 my-6 w-full">
                        <AppBreadcrumb items={breadcrumbItems} />
                    </div>
                    <p className="text-sm text-muted-foreground">Advertisement not found.</p>
                </div>
            </section>
        );
    }

    const typeMeta   = ADVERTISEMENT_TYPE_MAP[advertisement.type] ?? {};
    const statusMeta = ADVERTISEMENT_STATUS_MAP[advertisement.status] ?? {};
    const TypeIcon   = typeMeta.icon ?? Megaphone;

    const previewSrc = advertisement.image?.thumbnail_url || advertisement.image?.file_url || advertisement.image_url || null;
    const ctas = Array.isArray(advertisement.ctas) ? advertisement.ctas : [];

    return (
        <section className="bg-muted h-full">
            <div className="lg:container lg:mx-auto lg:px-0 flex flex-col items-center px-4">
                <div className="flex flex-col gap-2 my-6 w-full">
                    <AppBreadcrumb items={breadcrumbItems} />
                </div>

                <div className="w-full max-w-2xl pb-10 space-y-5">

                    {/* ── Header ─────────────────────────────────────────────────── */}
                    <div className="flex items-center justify-between flex-wrap gap-3">
                        <div className="flex items-center gap-2">
                            <Button variant="ghost" size="icon" onClick={() => navigate("/admin/advertisements")} aria-label="Back">
                                <ArrowLeft className="size-4" />
                            </Button>
                            <div>
                                <h1 className="text-xl font-semibold tracking-tight">
                                    {advertisement.headline || advertisement.badge_label || "Untitled advertisement"}
                                </h1>
                                <div className="flex items-center gap-1.5 mt-1">
                                    <Badge variant="secondary" className="gap-1">
                                        <TypeIcon className="size-3" />
                                        {typeMeta.label ?? advertisement.type}
                                    </Badge>
                                    <Badge variant={advertisement.status === "active" ? "default" : "secondary"}>
                                        {statusMeta.label ?? advertisement.status}
                                    </Badge>
                                </div>
                            </div>
                        </div>
                        <Button onClick={() => navigate(`/admin/advertisements/${advertisementId}/edit`)}>
                            <Edit className="size-4" />
                            Edit
                        </Button>
                    </div>

                    {/* ── Preview ────────────────────────────────────────────────── */}
                    <SectionCard title="Preview">
                        <div className="h-48 rounded-lg bg-muted flex items-center justify-center overflow-hidden">
                            {previewSrc ? (
                                <img src={previewSrc} alt={advertisement.headline || advertisement.type} className="w-full h-full object-cover" />
                            ) : (
                                <Megaphone className="size-8 text-muted-foreground" />
                            )}
                        </div>
                    </SectionCard>

                    {/* ── Content ────────────────────────────────────────────────── */}
                    <SectionCard title="Content">
                        <Field label="Badge label">{advertisement.badge_label || "—"}</Field>
                        <Field label="Headline">{advertisement.headline || "—"}</Field>
                        <Field label="Description">{advertisement.description || "—"}</Field>
                    </SectionCard>

                    {/* ── Calls to action ────────────────────────────────────────── */}
                    {ctas.length > 0 && (
                        <SectionCard title="Calls to action">
                            <div className="flex flex-col gap-2">
                                {ctas.map((cta, i) => (
                                    <div key={i} className="flex items-center justify-between text-sm border rounded-md px-3 py-2">
                                        <span className="font-medium">{cta.label}</span>
                                        <a href={cta.link} target="_blank" rel="noreferrer" className="text-muted-foreground flex items-center gap-1 hover:text-foreground">
                                            {cta.link}
                                            <ExternalLink className="size-3" />
                                        </a>
                                    </div>
                                ))}
                            </div>
                        </SectionCard>
                    )}

                    {/* ── Scheduling & display ──────────────────────────────────── */}
                    <SectionCard title="Scheduling & display">
                        <div className="grid grid-cols-2 gap-4">
                            <Field label="Start date">{fmtDateTime(advertisement.start_date)}</Field>
                            <Field label="End date">{fmtDateTime(advertisement.end_date)}</Field>
                            <Field label="Order">{advertisement.order ?? 0}</Field>
                            <Field label="Active">{advertisement.is_active ? "Yes" : "No"}</Field>
                        </div>
                    </SectionCard>

                    {/* ── Metrics ────────────────────────────────────────────────── */}
                    <SectionCard title="Metrics">
                        <div className="flex items-center gap-2 text-sm">
                            <MousePointerClick className="size-4 text-muted-foreground" />
                            <span className="font-medium">{advertisement.click_count ?? 0}</span>
                            <span className="text-muted-foreground">clicks</span>
                        </div>
                    </SectionCard>

                    {/* ── Audit ──────────────────────────────────────────────────── */}
                    <SectionCard title="Audit">
                        <div className="grid grid-cols-2 gap-4">
                            <Field label="Created by">{advertisement.creator?.full_name || "—"}</Field>
                            <Field label="Created at">{fmtDateTime(advertisement.createdAt)}</Field>
                            <Field label="Last updated by">{advertisement.updater?.full_name || "—"}</Field>
                            <Field label="Last updated at">{fmtDateTime(advertisement.updatedAt)}</Field>
                        </div>
                    </SectionCard>
                </div>
            </div>
        </section>
    );
}