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 { Loader2, Upload, Trash2, Building2 } from "lucide-react";
import { toast } from "sonner";

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

const EMPTY = {
  company_name: "",
  contact_email: "",
  contact_phone: "",
  website: "",
  address_line1: "",
  address_line2: "",
  city: "",
  state: "",
  postal_code: "",
  country: "",
  invoice_prefix: "",
  default_tax_rate: "",
  footer_note: "",
  logo_storage_path: "" as string | null | "",
};

function CompanySettingsPage() {
  const { user } = useAuth();
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [uploading, setUploading] = useState(false);
  const [recordId, setRecordId] = useState<string | null>(null);
  const [form, setForm] = useState({ ...EMPTY });
  const [logoUrl, setLogoUrl] = useState<string | null>(null);
  const fileInput = useRef<HTMLInputElement>(null);

  const load = async () => {
    setLoading(true);
    const { data } = await supabase
      .from("firm_settings")
      .select("*")
      .order("updated_at", { ascending: false })
      .limit(1)
      .maybeSingle();
    if (data) {
      setRecordId(data.id);
      setForm({
        company_name: data.company_name ?? "",
        contact_email: data.contact_email ?? "",
        contact_phone: data.contact_phone ?? "",
        website: data.website ?? "",
        address_line1: data.address_line1 ?? "",
        address_line2: data.address_line2 ?? "",
        city: data.city ?? "",
        state: data.state ?? "",
        postal_code: data.postal_code ?? "",
        country: data.country ?? "",
        invoice_prefix: data.invoice_prefix ?? "",
        default_tax_rate:
          data.default_tax_rate != null ? String(data.default_tax_rate) : "",
        footer_note: data.footer_note ?? "",
        logo_storage_path: data.logo_storage_path ?? "",
      });
      if (data.logo_storage_path) {
        const { data: pub } = supabase.storage
          .from("firm-logos")
          .getPublicUrl(data.logo_storage_path);
        setLogoUrl(pub.publicUrl);
      } else {
        setLogoUrl(null);
      }
    }
    setLoading(false);
  };

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

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

  const onLogoFile = async (file: File) => {
    setUploading(true);
    const ext = file.name.split(".").pop() || "png";
    const path = `firm-${Date.now()}.${ext}`;
    const { error } = await supabase.storage
      .from("firm-logos")
      .upload(path, file, { upsert: true, contentType: file.type });
    if (error) {
      setUploading(false);
      toast.error("Upload failed", { description: error.message });
      return;
    }
    setForm((f) => ({ ...f, logo_storage_path: path }));
    const { data: pub } = supabase.storage
      .from("firm-logos")
      .getPublicUrl(path);
    setLogoUrl(pub.publicUrl);
    setUploading(false);
    toast.success("Logo uploaded — remember to save");
  };

  const removeLogo = () => {
    setForm((f) => ({ ...f, logo_storage_path: "" }));
    setLogoUrl(null);
  };

  const save = async () => {
    setSaving(true);
    const payload: any = {
      company_name: form.company_name || null,
      contact_email: form.contact_email || null,
      contact_phone: form.contact_phone || null,
      website: form.website || null,
      address_line1: form.address_line1 || null,
      address_line2: form.address_line2 || null,
      city: form.city || null,
      state: form.state || null,
      postal_code: form.postal_code || null,
      country: form.country || null,
      invoice_prefix: form.invoice_prefix || null,
      default_tax_rate: form.default_tax_rate
        ? parseFloat(form.default_tax_rate)
        : null,
      footer_note: form.footer_note || null,
      logo_storage_path: form.logo_storage_path || null,
      updated_by: user?.id,
    };
    const { error } = recordId
      ? await supabase.from("firm_settings").update(payload).eq("id", recordId)
      : await supabase.from("firm_settings").insert(payload);
    setSaving(false);
    if (error) {
      toast.error("Could not save", { description: error.message });
      return;
    }
    toast.success("Settings 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-4xl">
      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base flex items-center gap-2">
            <Building2 className="h-4 w-4 text-muted-foreground" /> Company logo
          </CardTitle>
        </CardHeader>
        <CardContent className="flex flex-wrap items-center gap-6">
          <div className="h-24 w-24 rounded-md border bg-muted/30 flex items-center justify-center overflow-hidden">
            {logoUrl ? (
              <img
                src={logoUrl}
                alt="Firm logo"
                className="h-full w-full object-contain"
              />
            ) : (
              <Building2 className="h-8 w-8 text-muted-foreground" />
            )}
          </div>
          <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) onLogoFile(f);
              }}
            />
            <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 logo
              </Button>
              {logoUrl && (
                <Button variant="ghost" size="sm" onClick={removeLogo}>
                  <Trash2 className="h-4 w-4 mr-2" /> Remove
                </Button>
              )}
            </div>
            <p className="text-xs text-muted-foreground">
              PNG, JPG or SVG recommended. Max ~2 MB.
            </p>
          </div>
        </CardContent>
      </Card>

      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base">
            Company information
          </CardTitle>
        </CardHeader>
        <CardContent className="grid gap-4 sm:grid-cols-2">
          <Field label="Company name">
            <Input
              value={form.company_name}
              onChange={(e) => update("company_name", e.target.value)}
            />
          </Field>
          <Field label="Website">
            <Input
              value={form.website}
              onChange={(e) => update("website", e.target.value)}
              placeholder="https://"
            />
          </Field>
          <Field label="Contact email">
            <Input
              type="email"
              value={form.contact_email}
              onChange={(e) => update("contact_email", e.target.value)}
            />
          </Field>
          <Field label="Contact phone">
            <Input
              value={form.contact_phone}
              onChange={(e) => update("contact_phone", e.target.value)}
            />
          </Field>
          <Field label="Address line 1" className="sm:col-span-2">
            <Input
              value={form.address_line1}
              onChange={(e) => update("address_line1", e.target.value)}
            />
          </Field>
          <Field label="Address line 2" className="sm:col-span-2">
            <Input
              value={form.address_line2}
              onChange={(e) => update("address_line2", e.target.value)}
            />
          </Field>
          <Field label="City">
            <Input
              value={form.city}
              onChange={(e) => update("city", e.target.value)}
            />
          </Field>
          <Field label="State / Province">
            <Input
              value={form.state}
              onChange={(e) => update("state", e.target.value)}
            />
          </Field>
          <Field label="Postal code">
            <Input
              value={form.postal_code}
              onChange={(e) => update("postal_code", e.target.value)}
            />
          </Field>
          <Field label="Country">
            <Input
              value={form.country}
              onChange={(e) => update("country", e.target.value)}
            />
          </Field>
        </CardContent>
      </Card>

      <Card className="border-border/60">
        <CardHeader>
          <CardTitle className="font-serif text-base">
            Invoice defaults
          </CardTitle>
        </CardHeader>
        <CardContent className="grid gap-4 sm:grid-cols-2">
          <Field label="Invoice number prefix">
            <Input
              value={form.invoice_prefix}
              onChange={(e) => update("invoice_prefix", e.target.value)}
              placeholder="e.g. INV-"
            />
          </Field>
          <Field label="Default tax rate (%)">
            <Input
              type="number"
              step="0.01"
              min="0"
              max="100"
              value={form.default_tax_rate}
              onChange={(e) => update("default_tax_rate", e.target.value)}
            />
          </Field>
          <Field label="Invoice footer note" className="sm:col-span-2">
            <Textarea
              rows={3}
              value={form.footer_note}
              onChange={(e) => update("footer_note", e.target.value)}
              placeholder="Thank you for your business…"
            />
          </Field>
        </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>
  );
}