import { createFileRoute, Link } from "@tanstack/react-router";
import { useEffect, useState } from "react";
import { ProtectedLayout } from "@/components/protected-layout";
import { PageContainer, PageHeader } from "@/components/app-shell";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { supabase } from "@/integrations/supabase/client";
import { formatDate } from "@/lib/format";
import { FilePlus2, FileText, Gavel, LayoutTemplate, Plus, Download, Trash2 } from "lucide-react";
import { toast } from "sonner";

export const Route = createFileRoute("/documents/")({
  component: DocumentsIndex,
});

function DocumentsIndex() {
  const [generated, setGenerated] = useState<any[]>([]);
  const [templates, setTemplates] = useState<any[]>([]);

  const load = async () => {
    const [g, t] = await Promise.all([
      supabase.from("generated_documents").select("*").order("created_at", { ascending: false }).limit(20),
      supabase.from("document_templates").select("*").order("name"),
    ]);
    setGenerated(g.data ?? []);
    setTemplates(t.data ?? []);
  };

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

  const removeGenerated = async (row: any) => {
    if (!confirm(`Delete ${row.name}?`)) return;
    if (row.storage_path) await supabase.storage.from("generated-documents").remove([row.storage_path]);
    const { error } = await supabase.from("generated_documents").delete().eq("id", row.id);
    if (error) toast.error(error.message); else { toast.success("Deleted"); load(); }
  };

  const downloadGenerated = async (row: any) => {
    if (!row.storage_path) { toast.error("No file stored for this document"); return; }
    const { data, error } = await supabase.storage.from("generated-documents").createSignedUrl(row.storage_path, 60);
    if (error) { toast.error(error.message); return; }
    window.open(data.signedUrl, "_blank");
  };

  return (
    <ProtectedLayout>
      <PageContainer>
        <PageHeader
          title="Documents"
          description="Create pleadings and reusable document templates."
          actions={
            <>
              <Button asChild variant="outline">
                <Link to="/documents/templates">
                  <LayoutTemplate className="h-4 w-4 mr-2" /> Templates
                </Link>
              </Button>
              <Button asChild>
                <Link to="/documents/pleading/new">
                  <Gavel className="h-4 w-4 mr-2" /> New Pleading
                </Link>
              </Button>
            </>
          }
        />

        <div className="grid md:grid-cols-3 gap-4 mb-8">
          <Link to="/documents/pleading/new">
            <Card className="hover:border-primary/40 transition-colors cursor-pointer h-full">
              <CardContent className="p-5 flex items-start gap-3">
                <div className="h-10 w-10 rounded-md bg-primary/10 text-primary flex items-center justify-center"><Gavel className="h-5 w-5" /></div>
                <div>
                  <div className="font-medium">Florida Pleading</div>
                  <div className="text-xs text-muted-foreground mt-1">Court caption header in Bookman Old Style 12pt.</div>
                </div>
              </CardContent>
            </Card>
          </Link>
          <Link to="/documents/templates/new">
            <Card className="hover:border-primary/40 transition-colors cursor-pointer h-full">
              <CardContent className="p-5 flex items-start gap-3">
                <div className="h-10 w-10 rounded-md bg-primary/10 text-primary flex items-center justify-center"><FilePlus2 className="h-5 w-5" /></div>
                <div>
                  <div className="font-medium">New template</div>
                  <div className="text-xs text-muted-foreground mt-1">Define custom merge fields and reuse them.</div>
                </div>
              </CardContent>
            </Card>
          </Link>
          <Link to="/documents/templates">
            <Card className="hover:border-primary/40 transition-colors cursor-pointer h-full">
              <CardContent className="p-5 flex items-start gap-3">
                <div className="h-10 w-10 rounded-md bg-primary/10 text-primary flex items-center justify-center"><LayoutTemplate className="h-5 w-5" /></div>
                <div>
                  <div className="font-medium">Template library</div>
                  <div className="text-xs text-muted-foreground mt-1">{templates.length} template{templates.length === 1 ? "" : "s"} available.</div>
                </div>
              </CardContent>
            </Card>
          </Link>
        </div>

        <Card>
          <CardHeader className="flex flex-row items-center justify-between">
            <CardTitle className="text-base">Recent documents</CardTitle>
          </CardHeader>
          <CardContent className="p-0">
            {generated.length === 0 ? (
              <div className="text-center py-12 text-muted-foreground text-sm">No documents yet. Create a pleading or use a template.</div>
            ) : (
              <table className="w-full text-sm">
                <thead className="bg-muted/40 text-xs uppercase tracking-wider text-muted-foreground">
                  <tr>
                    <th className="text-left px-4 py-3 font-medium">Name</th>
                    <th className="text-left px-4 py-3 font-medium">Type</th>
                    <th className="text-left px-4 py-3 font-medium">Created</th>
                    <th className="text-right px-4 py-3 font-medium">Actions</th>
                  </tr>
                </thead>
                <tbody>
                  {generated.map((d) => (
                    <tr key={d.id} className="border-t hover:bg-muted/30">
                      <td className="px-4 py-3"><div className="flex items-center gap-2"><FileText className="h-4 w-4 text-muted-foreground" /><span className="font-medium">{d.name}</span></div></td>
                      <td className="px-4 py-3"><Badge variant="outline" className="capitalize">{d.kind}</Badge></td>
                      <td className="px-4 py-3 text-muted-foreground">{formatDate(d.created_at)}</td>
                      <td className="px-4 py-3 text-right">
                        {d.storage_path && (
                          <Button variant="ghost" size="icon" onClick={() => downloadGenerated(d)}><Download className="h-4 w-4" /></Button>
                        )}
                        <Button variant="ghost" size="icon" onClick={() => removeGenerated(d)}><Trash2 className="h-4 w-4 text-destructive" /></Button>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            )}
          </CardContent>
        </Card>
      </PageContainer>
    </ProtectedLayout>
  );
}