import { createFileRoute } from "@tanstack/react-router";
import { useEffect, useState } from "react";
import { supabase } from "@/integrations/supabase/client";
import { ProtectedLayout } from "@/components/protected-layout";
import { PageContainer, PageHeader } from "@/components/app-shell";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Input } from "@/components/ui/input";
import { Loader2, Inbox as InboxIcon, RefreshCcw, Search, Mail, MailOpen, Archive, ArchiveRestore, Trash2 } from "lucide-react";
import { toast } from "sonner";
import { useAuth } from "@/lib/auth";

export const Route = createFileRoute("/inbox/")({
  component: InboxPage,
});

interface IncomingEmail {
  id: string;
  received_at: string;
  from_address: string | null;
  from_name: string | null;
  to_addresses: string[];
  subject: string | null;
  snippet: string | null;
  body_text: string | null;
  body_html: string | null;
  is_read: boolean;
  is_archived: boolean;
  has_attachments: boolean;
  attachment_count: number;
}

function InboxPage() {
  const { isAdmin } = useAuth();
  const [emails, setEmails] = useState<IncomingEmail[]>([]);
  const [loading, setLoading] = useState(true);
  const [polling, setPolling] = useState(false);
  const [showArchived, setShowArchived] = useState(false);
  const [search, setSearch] = useState("");
  const [selectedId, setSelectedId] = useState<string | null>(null);

  const load = async () => {
    setLoading(true);
    let query = supabase
      .from("incoming_emails")
      .select("id, received_at, from_address, from_name, to_addresses, subject, snippet, body_text, body_html, is_read, is_archived, has_attachments, attachment_count")
      .order("received_at", { ascending: false })
      .limit(200);
    query = showArchived ? query.eq("is_archived", true) : query.eq("is_archived", false);
    const { data, error } = await query;
    if (error) {
      toast.error("Failed to load inbox", { description: error.message });
    } else {
      setEmails((data as IncomingEmail[]) ?? []);
    }
    setLoading(false);
  };

  useEffect(() => {
    load();
  }, [showArchived]);

  const pollNow = async () => {
    setPolling(true);
    try {
      const res = await fetch("/hooks/poll-imap", { method: "POST" });
      const body = await res.json();
      if (!res.ok || body.error) {
        toast.error("Poll failed", { description: body.error });
      } else {
        toast.success(`Imported ${body.imported ?? 0} new email(s)`);
        load();
      }
    } catch (e) {
      toast.error("Poll failed", {
        description: e instanceof Error ? e.message : String(e),
      });
    } finally {
      setPolling(false);
    }
  };

  const markRead = async (id: string, isRead: boolean) => {
    await supabase.from("incoming_emails").update({ is_read: isRead }).eq("id", id);
    setEmails((prev) =>
      prev.map((e) => (e.id === id ? { ...e, is_read: isRead } : e)),
    );
  };

  const toggleArchive = async (id: string, archive: boolean) => {
    await supabase.from("incoming_emails").update({ is_archived: archive }).eq("id", id);
    setEmails((prev) => prev.filter((e) => e.id !== id));
    if (selectedId === id) setSelectedId(null);
    toast.success(archive ? "Archived" : "Restored");
  };

  const deleteEmail = async (id: string) => {
    if (!confirm("Delete this email permanently?")) return;
    const { error } = await supabase.from("incoming_emails").delete().eq("id", id);
    if (error) {
      toast.error("Delete failed", { description: error.message });
      return;
    }
    setEmails((prev) => prev.filter((e) => e.id !== id));
    if (selectedId === id) setSelectedId(null);
  };

  const filtered = emails.filter((e) => {
    if (!search.trim()) return true;
    const q = search.toLowerCase();
    return (
      (e.subject ?? "").toLowerCase().includes(q) ||
      (e.from_address ?? "").toLowerCase().includes(q) ||
      (e.from_name ?? "").toLowerCase().includes(q) ||
      (e.snippet ?? "").toLowerCase().includes(q)
    );
  });

  const selected = emails.find((e) => e.id === selectedId) ?? null;
  const unreadCount = emails.filter((e) => !e.is_read).length;

  return (
    <ProtectedLayout>
      <PageContainer>
        <PageHeader
          title="Inbox"
          description={`Incoming emails received via IMAP. ${unreadCount} unread.`}
          actions={
            <Button onClick={pollNow} disabled={polling} variant="outline" size="sm">
              {polling ? (
                <Loader2 className="h-4 w-4 mr-2 animate-spin" />
              ) : (
                <RefreshCcw className="h-4 w-4 mr-2" />
              )}
              Check for new mail
            </Button>
          }
        />

        <div className="flex items-center gap-2 mb-4">
          <div className="relative flex-1 max-w-md">
            <Search className="absolute left-2 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
            <Input
              placeholder="Search by subject, sender..."
              value={search}
              onChange={(e) => setSearch(e.target.value)}
              className="pl-8"
            />
          </div>
          <Button
            variant={showArchived ? "default" : "outline"}
            size="sm"
            onClick={() => {
              setShowArchived((v) => !v);
              setSelectedId(null);
            }}
          >
            {showArchived ? "Showing archived" : "Show archived"}
          </Button>
        </div>

        {loading ? (
          <div className="flex justify-center py-16">
            <Loader2 className="h-5 w-5 animate-spin text-muted-foreground" />
          </div>
        ) : filtered.length === 0 ? (
          <Card className="border-dashed">
            <CardContent className="py-12 text-center text-sm text-muted-foreground">
              <InboxIcon className="h-8 w-8 mx-auto mb-3 opacity-50" />
              {showArchived ? "No archived emails." : "No emails yet. "}
              {!showArchived && (
                <>Configure IMAP in <a className="underline" href="/settings/imap">Settings → Email (IMAP)</a> and click "Check for new mail".</>
              )}
            </CardContent>
          </Card>
        ) : (
          <div className="grid gap-4 lg:grid-cols-[minmax(0,2fr)_minmax(0,3fr)]">
            <Card className="border-border/60 overflow-hidden">
              <div className="divide-y max-h-[70vh] overflow-y-auto">
                {filtered.map((email) => (
                  <button
                    key={email.id}
                    type="button"
                    onClick={() => {
                      setSelectedId(email.id);
                      if (!email.is_read) markRead(email.id, true);
                    }}
                    className={`w-full text-left px-3 py-3 hover:bg-muted/50 transition-colors ${
                      selectedId === email.id ? "bg-muted" : ""
                    } ${!email.is_read ? "font-medium" : ""}`}
                  >
                    <div className="flex items-center justify-between gap-2">
                      <span className="truncate text-sm">
                        {email.from_name || email.from_address || "Unknown sender"}
                      </span>
                      <span className="text-[10px] text-muted-foreground whitespace-nowrap">
                        {new Date(email.received_at).toLocaleDateString()}
                      </span>
                    </div>
                    <div className="text-sm truncate mt-0.5">
                      {email.subject || "(no subject)"}
                    </div>
                    <div className="text-xs text-muted-foreground truncate mt-0.5">
                      {email.snippet || "(empty body)"}
                    </div>
                    <div className="flex items-center gap-1.5 mt-1">
                      {!email.is_read && (
                        <Badge variant="default" className="h-4 text-[9px] px-1.5">NEW</Badge>
                      )}
                      {email.has_attachments && (
                        <Badge variant="secondary" className="h-4 text-[9px] px-1.5">
                          📎 {email.attachment_count}
                        </Badge>
                      )}
                    </div>
                  </button>
                ))}
              </div>
            </Card>

            <Card className="border-border/60">
              {selected ? (
                <CardContent className="p-4 space-y-3">
                  <div className="flex items-start justify-between gap-2">
                    <div className="min-w-0">
                      <h2 className="font-serif text-lg leading-tight">
                        {selected.subject || "(no subject)"}
                      </h2>
                      <div className="text-sm text-muted-foreground mt-1">
                        From: <span className="text-foreground">
                          {selected.from_name
                            ? `${selected.from_name} <${selected.from_address}>`
                            : selected.from_address}
                        </span>
                      </div>
                      <div className="text-xs text-muted-foreground">
                        To: {selected.to_addresses.join(", ")}
                      </div>
                      <div className="text-xs text-muted-foreground">
                        {new Date(selected.received_at).toLocaleString()}
                      </div>
                    </div>
                    <div className="flex items-center gap-1 shrink-0">
                      <Button
                        size="sm"
                        variant="ghost"
                        onClick={() => markRead(selected.id, !selected.is_read)}
                        title={selected.is_read ? "Mark unread" : "Mark read"}
                      >
                        {selected.is_read ? <Mail className="h-4 w-4" /> : <MailOpen className="h-4 w-4" />}
                      </Button>
                      <Button
                        size="sm"
                        variant="ghost"
                        onClick={() => toggleArchive(selected.id, !selected.is_archived)}
                        title={selected.is_archived ? "Unarchive" : "Archive"}
                      >
                        {selected.is_archived ? <ArchiveRestore className="h-4 w-4" /> : <Archive className="h-4 w-4" />}
                      </Button>
                      {isAdmin && (
                        <Button
                          size="sm"
                          variant="ghost"
                          onClick={() => deleteEmail(selected.id)}
                          title="Delete"
                        >
                          <Trash2 className="h-4 w-4 text-destructive" />
                        </Button>
                      )}
                    </div>
                  </div>
                  <div className="border-t pt-3">
                    {selected.body_html ? (
                      <iframe
                        title="Email body"
                        srcDoc={selected.body_html}
                        sandbox=""
                        className="w-full min-h-[400px] border rounded bg-white"
                      />
                    ) : (
                      <pre className="text-sm whitespace-pre-wrap font-sans">
                        {selected.body_text || "(empty)"}
                      </pre>
                    )}
                  </div>
                </CardContent>
              ) : (
                <CardContent className="py-16 text-center text-sm text-muted-foreground">
                  Select an email to read.
                </CardContent>
              )}
            </Card>
          </div>
        )}
      </PageContainer>
    </ProtectedLayout>
  );
}