import { createFileRoute } from "@tanstack/react-router";
import { useEffect, useRef, useState } from "react";
import { supabase } from "@/integrations/supabase/client";
import { useAuth } from "@/lib/auth";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { Loader2, Upload, Trash2, User as UserIcon, PenLine } from "lucide-react";
import { toast } from "sonner";

export const Route = createFileRoute("/settings/profile")({
  component: ProfilePage,
});

const EMPTY = {
  full_name: "",
  title: "",
  phone: "",
  bio: "",
  timezone: "",
  avatar_url: "" as string | null | "",
  signature_block: "",
  signature_typed: "",
  signature_image_path: "" as string | null | "",
};

function initials(name: string, email: string) {
  const src = name?.trim() || email || "";
  return src.split(/\s+/).map((p) => p[0]).filter(Boolean).slice(0, 2).join("").toUpperCase();
}

function ProfilePage() {
  const { user } = useAuth();
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [uploading, setUploading] = useState(false);
  const [uploadingSig, setUploadingSig] = useState(false);
  const [form, setForm] = useState({ ...EMPTY });
  const [email, setEmail] = useState("");
  const fileInput = useRef<HTMLInputElement>(null);
  const sigInput = useRef<HTMLInputElement>(null);

  // Derive a public preview URL for the saved signature image
  const signatureUrl = form.signature_image_path
    ? supabase.storage.from("avatars").getPublicUrl(form.signature_image_path).data.publicUrl
    : "";

  const load = async () => {
    if (!user) return;
    setLoading(true);
    const { data } = await supabase
      .from("profiles")
      .select("*")
      .eq("id", user.id)
      .maybeSingle();
    if (data) {
      setEmail(data.email || user.email || "");
      const d = data as any;
      setForm({
        full_name: data.full_name ?? "",
        title: d.title ?? "",
        phone: d.phone ?? "",
        bio: d.bio ?? "",
        timezone: d.timezone ?? "",
        avatar_url: d.avatar_url ?? "",
        signature_block: d.signature_block ?? "",
        signature_typed: d.signature_typed ?? "",
        signature_image_path: d.signature_image_path ?? "",
      });
    }
    setLoading(false);
  };

  useEffect(() => {
    load();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [user?.id]);

  const update = (k: keyof typeof EMPTY, v: string) =>
    setForm((f) => ({ ...f, [k]: v }));

  const onAvatarFile = async (file: File) => {
    if (!user) return;
    if (file.size > 5 * 1024 * 1024) {
      toast.error("Image must be under 5 MB");
      return;
    }
    setUploading(true);
    const ext = (file.name.split(".").pop() || "png").toLowerCase();
    // Path must start with the user's id for the storage policy to allow it.
    const path = `${user.id}/avatar-${Date.now()}.${ext}`;
    const { error } = await supabase.storage
      .from("avatars")
      .upload(path, file, { upsert: true, contentType: file.type, cacheControl: "3600" });
    if (error) {
      setUploading(false);
      toast.error("Upload failed", { description: error.message });
      return;
    }
    const { data: pub } = supabase.storage.from("avatars").getPublicUrl(path);
    const url = pub.publicUrl;
    // Persist immediately so it appears in the sidebar without a save click.
    const { error: upErr } = await supabase
      .from("profiles")
      .update({ avatar_url: url })
      .eq("id", user.id);
    setUploading(false);
    if (upErr) {
      toast.error("Could not save avatar", { description: upErr.message });
      return;
    }
    setForm((f) => ({ ...f, avatar_url: url }));
    toast.success("Profile photo updated");
  };

  const removeAvatar = async () => {
    if (!user) return;
    const { error } = await supabase
      .from("profiles")
      .update({ avatar_url: null })
      .eq("id", user.id);
    if (error) {
      toast.error("Could not remove", { description: error.message });
      return;
    }
    setForm((f) => ({ ...f, avatar_url: "" }));
    toast.success("Photo removed");
  };

  const onSignatureFile = async (file: File) => {
    if (!user) return;
    if (file.size > 2 * 1024 * 1024) {
      toast.error("Signature image must be under 2 MB");
      return;
    }
    setUploadingSig(true);
    const ext = (file.name.split(".").pop() || "png").toLowerCase();
    const path = `${user.id}/signature-${Date.now()}.${ext}`;
    const { error } = await supabase.storage
      .from("avatars")
      .upload(path, file, { upsert: true, contentType: file.type, cacheControl: "3600" });
    if (error) {
      setUploadingSig(false);
      toast.error("Upload failed", { description: error.message });
      return;
    }
    const { error: upErr } = await supabase
      .from("profiles")
      .update({ signature_image_path: path } as any)
      .eq("id", user.id);
    setUploadingSig(false);
    if (upErr) {
      toast.error("Could not save signature", { description: upErr.message });
      return;
    }
    setForm((f) => ({ ...f, signature_image_path: path }));
    toast.success("Signature image saved");
  };

  const removeSignatureImage = async () => {
    if (!user) return;
    const { error } = await supabase
      .from("profiles")
      .update({ signature_image_path: null } as any)
      .eq("id", user.id);
    if (error) {
      toast.error("Could not remove", { description: error.message });
      return;
    }
    setForm((f) => ({ ...f, signature_image_path: "" }));
    toast.success("Signature image removed");
  };

  const save = async () => {
    if (!user) return;
    setSaving(true);
    const { error } = await supabase
      .from("profiles")
      .update({
        full_name: form.full_name || "",
        title: form.title || null,
        phone: form.phone || null,
        bio: form.bio || null,
        timezone: form.timezone || null,
        signature_block: form.signature_block || null,
        signature_typed: form.signature_typed || null,
      } as any)
      .eq("id", user.id);
    setSaving(false);
    if (error) {
      toast.error("Could not save", { description: error.message });
      return;
    }
    toast.success("Profile saved");
    load();
  };

  if (loading) {
    return (
      <div className="flex justify-center py-16">
        <Loader2 className="h-5 w-5 animate-spin text-muted-foreground" />
      </div>
    );
  }

  return (
    <div className="space-y-6 max-w-3xl">
      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base flex items-center gap-2">
            <UserIcon className="h-4 w-4 text-muted-foreground" /> Profile photo
          </CardTitle>
        </CardHeader>
        <CardContent className="flex flex-wrap items-center gap-6">
          <Avatar className="h-24 w-24">
            {form.avatar_url ? <AvatarImage src={form.avatar_url} alt="Avatar" /> : null}
            <AvatarFallback className="text-lg">
              {initials(form.full_name, email)}
            </AvatarFallback>
          </Avatar>
          <div className="flex flex-col gap-2">
            <input
              ref={fileInput}
              type="file"
              accept="image/*"
              className="hidden"
              onChange={(e) => {
                const f = e.target.files?.[0];
                if (f) onAvatarFile(f);
                e.target.value = "";
              }}
            />
            <div className="flex gap-2">
              <Button
                variant="outline"
                size="sm"
                onClick={() => fileInput.current?.click()}
                disabled={uploading}
              >
                {uploading ? (
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                ) : (
                  <Upload className="h-4 w-4 mr-2" />
                )}
                Upload photo
              </Button>
              {form.avatar_url && (
                <Button variant="ghost" size="sm" onClick={removeAvatar}>
                  <Trash2 className="h-4 w-4 mr-2" /> Remove
                </Button>
              )}
            </div>
            <p className="text-xs text-muted-foreground">PNG or JPG, up to 5 MB.</p>
          </div>
        </CardContent>
      </Card>

      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base">Personal information</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-4 sm:grid-cols-2">
          <Field label="Full name">
            <Input
              value={form.full_name}
              onChange={(e) => update("full_name", e.target.value)}
            />
          </Field>
          <Field label="Email">
            <Input value={email} disabled />
          </Field>
          <Field label="Job title">
            <Input
              value={form.title}
              onChange={(e) => update("title", e.target.value)}
              placeholder="Attorney, Paralegal, etc."
            />
          </Field>
          <Field label="Phone">
            <Input
              value={form.phone}
              onChange={(e) => update("phone", e.target.value)}
            />
          </Field>
          <Field label="Timezone">
            <Input
              value={form.timezone}
              onChange={(e) => update("timezone", e.target.value)}
              placeholder="America/New_York"
            />
          </Field>
          <Field label="Bio" className="sm:col-span-2">
            <Textarea
              rows={4}
              value={form.bio}
              onChange={(e) => update("bio", e.target.value)}
              placeholder="A short introduction shown on your profile."
            />
          </Field>
        </CardContent>
      </Card>

      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base flex items-center gap-2">
            <PenLine className="h-4 w-4 text-muted-foreground" /> Attorney signature
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-5">
          <p className="text-xs text-muted-foreground">
            Used in pleadings. The signature line is drawn automatically; the block
            below appears under it. Optionally upload a scanned signature image to
            place above the line.
          </p>

          <Field label="Signature block">
            <Textarea
              rows={6}
              value={form.signature_block}
              onChange={(e) => update("signature_block", e.target.value)}
              placeholder={`Jane Q. Attorney, Esq.\nFlorida Bar No. 123456\nSmith & Associates, P.A.\n123 Main St., Suite 200\nMiami, FL 33131\n(305) 555-0100 · jane@smithlaw.com`}
              className="font-mono text-sm"
            />
          </Field>

          <div className="space-y-2">
            <Label className="text-xs">Typed signature (optional)</Label>
            <Input
              value={form.signature_typed}
              onChange={(e) => update("signature_typed", e.target.value)}
              placeholder="e.g. /s/ Jane Q. Attorney"
            />
            {form.signature_typed && (
              <div className="border rounded-md bg-white p-3">
                <span
                  className="text-2xl text-black"
                  style={{ fontFamily: '"Lucida Handwriting", "Brush Script MT", cursive' }}
                >
                  {form.signature_typed}
                </span>
              </div>
            )}
            <p className="text-xs text-muted-foreground">
              Used above the signature line if no signature image is uploaded. Rendered in a script font.
            </p>
          </div>


          <div className="space-y-2">
            <Label className="text-xs">Signature image (optional)</Label>
            <div className="flex flex-wrap items-center gap-4">
              <div className="border rounded-md bg-white p-3 min-w-[220px] min-h-[80px] flex items-center justify-center">
                {signatureUrl ? (
                  <img
                    src={signatureUrl}
                    alt="Signature"
                    className="max-h-[80px] max-w-[260px] object-contain"
                  />
                ) : (
                  <span className="text-xs text-muted-foreground italic">
                    No signature image
                  </span>
                )}
              </div>
              <div className="flex flex-col gap-2">
                <input
                  ref={sigInput}
                  type="file"
                  accept="image/png,image/jpeg"
                  className="hidden"
                  onChange={(e) => {
                    const f = e.target.files?.[0];
                    if (f) onSignatureFile(f);
                    e.target.value = "";
                  }}
                />
                <div className="flex gap-2">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => sigInput.current?.click()}
                    disabled={uploadingSig}
                  >
                    {uploadingSig ? (
                      <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                    ) : (
                      <Upload className="h-4 w-4 mr-2" />
                    )}
                    Upload signature
                  </Button>
                  {form.signature_image_path && (
                    <Button variant="ghost" size="sm" onClick={removeSignatureImage}>
                      <Trash2 className="h-4 w-4 mr-2" /> Remove
                    </Button>
                  )}
                </div>
                <p className="text-xs text-muted-foreground">
                  PNG or JPG with transparent or white background, up to 2 MB.
                </p>
              </div>
            </div>
          </div>
        </CardContent>
      </Card>

      <div className="flex justify-end">
        <Button onClick={save} disabled={saving}>
          {saving && <Loader2 className="h-4 w-4 mr-2 animate-spin" />}
          Save changes
        </Button>
      </div>
    </div>
  );
}

function Field({
  label,
  className,
  children,
}: {
  label: string;
  className?: string;
  children: React.ReactNode;
}) {
  return (
    <div className={`space-y-1.5 ${className ?? ""}`}>
      <Label className="text-xs">{label}</Label>
      {children}
    </div>
  );
}