"use client"

import { useState } from "react"
import {
  ArrowLeft,
  Download,
  Pencil,
  Sparkles,
  Star,
  Trash2,
  Mail,
  Phone,
  Building2,
  MapPin,
  Cake,
  FileText,
  MessageSquare,
  Video,
} from "lucide-react"
import { Button } from "@/components/ui/button"
import { useContactsStore } from "@/lib/contacts/contacts-store"
import { useContactsList } from "@/lib/contacts/use-contacts-list"
import { useDeleteContact } from "@/lib/api/hooks/use-contact-mutations"
import { ContactAvatar } from "@/components/gmail/contacts/contact-avatar"
import { fullContactDisplayName } from "@/lib/contacts/types"
import { useNavStore } from "@/lib/stores/nav-store"
import { downloadContactVCard } from "@/lib/contacts/export-contacts"
import {
  CONTACTS_HEADING_TEXT,
  CONTACTS_MUTED_TEXT,
  CONTACTS_PAGE_ICON_BTN_CLASS,
  CONTACTS_PAGE_TAG_CLASS,
  CONTACTS_PANEL_DIVIDER_CLASS,
  CONTACTS_PANEL_MUTED_ICON_CLASS,
  CONTACTS_PANEL_PRIMARY_ACTION_CLASS,
  CONTACTS_PANEL_SECONDARY_ICON_BTN_CLASS,
} from "@/lib/contacts-chrome-classes"
import { cn } from "@/lib/utils"
import { useLLMSettings } from "@/lib/api/hooks/use-contact-discovery"
import { isLLMConfigured } from "@/lib/contacts/llm-settings-utils"
import { ContactImproveDialog } from "@/components/gmail/contacts-page/contact-improve-dialog"

const FRENCH_MONTHS = [
  "janvier", "février", "mars", "avril", "mai", "juin",
  "juillet", "août", "septembre", "octobre", "novembre", "décembre",
]

function formatBirthday(b: { day?: number; month?: number; year?: number }): string {
  const parts: string[] = []
  if (b.day) parts.push(String(b.day))
  if (b.month) parts.push(FRENCH_MONTHS[b.month - 1] ?? "")
  if (b.year) parts.push(String(b.year))
  return parts.join(" ")
}

interface ContactDetailPageProps {
  contactId: string
  onBack: () => void
  onEdit: (id: string) => void
}

export function ContactDetailPage({ contactId, onBack, onEdit }: ContactDetailPageProps) {
  const { contacts } = useContactsList()
  const softDeleteContact = useContactsStore((s) => s.softDeleteContact)
  const deleteContactMutation = useDeleteContact()
  const labelRows = useNavStore((s) => s.labelRows)
  const { data: llmSettings } = useLLMSettings()
  const [improveOpen, setImproveOpen] = useState(false)
  const contact = contacts.find((c) => c.id === contactId)
  const llmReady = isLLMConfigured(llmSettings)

  if (!contact) {
    return (
      <div className={cn("flex h-full items-center justify-center text-sm", CONTACTS_MUTED_TEXT)}>
        Contact introuvable
      </div>
    )
  }

  const displayName = fullContactDisplayName(contact)
  const name = displayName || contact.emails[0]?.value || contact.phones[0]?.value || "?"
  const primaryEmail = contact.emails[0]?.value

  function handleDelete() {
    if (contact) softDeleteContact(contact, "Supprimé manuellement")
    deleteContactMutation.mutate({ path: contactId })
    onBack()
  }

  return (
    <div className="mx-auto max-w-3xl px-6 py-8 text-foreground">
      <div className="mb-6 flex items-center justify-between">
        <Button
          variant="ghost"
          size="icon"
          className={CONTACTS_PAGE_ICON_BTN_CLASS}
          onClick={onBack}
        >
          <ArrowLeft className="h-5 w-5" />
        </Button>
        <div className="flex items-center gap-1">
          <Button
            type="button"
            variant="outline"
            size="sm"
            className="mr-1 hidden rounded-full sm:inline-flex"
            onClick={() => setImproveOpen(true)}
            disabled={!llmReady}
            title={
              llmReady
                ? undefined
                : "Configurez un fournisseur LLM dans les réglages contacts"
            }
          >
            <Sparkles className="mr-1.5 h-4 w-4 text-amber-500" />
            Amélioration IA
          </Button>
          <Button variant="ghost" size="icon" className={CONTACTS_PAGE_ICON_BTN_CLASS}>
            <Star className="h-5 w-5" />
          </Button>
          <Button
            variant="ghost"
            size="icon"
            className={CONTACTS_PAGE_ICON_BTN_CLASS}
            onClick={() => downloadContactVCard(contact)}
            aria-label="Télécharger la fiche contact"
          >
            <Download className="h-5 w-5" />
          </Button>
          <Button
            variant="ghost"
            size="icon"
            className={CONTACTS_PAGE_ICON_BTN_CLASS}
            onClick={() => onEdit(contactId)}
          >
            <Pencil className="h-5 w-5" />
          </Button>
          <Button
            variant="ghost"
            size="icon"
            className={CONTACTS_PAGE_ICON_BTN_CLASS}
            onClick={handleDelete}
          >
            <Trash2 className="h-5 w-5" />
          </Button>
        </div>
      </div>

      <div className="flex items-center gap-6 pb-6">
        <ContactAvatar contact={contact} name={name} size="xl" />
        <div>
          <h1 className={cn("text-3xl", CONTACTS_HEADING_TEXT)}>{name}</h1>
          {contact.company && (
            <p className={cn("mt-1 text-base", CONTACTS_MUTED_TEXT)}>
              {contact.jobTitle ? `${contact.jobTitle} — ` : ""}
              {contact.company}
            </p>
          )}
          {contact.labels && contact.labels.length > 0 && (
            <div className="mt-2 flex flex-wrap gap-1">
              {contact.labels.map((labelId) => {
                const row = labelRows.find((r) => r.id === labelId)
                return row ? (
                  <span key={labelId} className={CONTACTS_PAGE_TAG_CLASS}>
                    <span className={`inline-block h-2 w-2 rounded-full ${row.color}`} />
                    {row.label}
                  </span>
                ) : null
              })}
            </div>
          )}
        </div>
      </div>

      <div className="mb-4 sm:hidden">
        <Button
          type="button"
          variant="outline"
          size="sm"
          className="w-full rounded-full"
          onClick={() => setImproveOpen(true)}
          disabled={!llmReady}
          title={
            llmReady
              ? undefined
              : "Configurez un fournisseur LLM dans les réglages contacts"
          }
        >
          <Sparkles className="mr-1.5 h-4 w-4 text-amber-500" />
          Amélioration IA
        </Button>
      </div>

      {primaryEmail && (
        <div className={cn("flex items-center gap-2 py-4", CONTACTS_PANEL_DIVIDER_CLASS)}>
          <button type="button" className={CONTACTS_PANEL_PRIMARY_ACTION_CLASS}>
            <Mail className="h-4 w-4" />
            Envoyer un e-mail
          </button>
          <button type="button" className={CONTACTS_PANEL_SECONDARY_ICON_BTN_CLASS}>
            <MessageSquare className="h-4 w-4" />
          </button>
          <button type="button" className={CONTACTS_PANEL_SECONDARY_ICON_BTN_CLASS}>
            <Video className="h-4 w-4" />
          </button>
        </div>
      )}

      <div className={cn("space-y-1 pt-4", CONTACTS_PANEL_DIVIDER_CLASS)}>
        {contact.emails.length > 0 && (
          <DetailRow icon={<Mail className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            {contact.emails.map((e, i) => (
              <div key={i}>
                <p className="text-sm text-primary">{e.value}</p>
                <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{e.label}</p>
              </div>
            ))}
          </DetailRow>
        )}

        {contact.phones.length > 0 && (
          <DetailRow icon={<Phone className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            {contact.phones.map((p, i) => (
              <div key={i}>
                <p className="text-sm text-primary">{p.value}</p>
                <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{p.label}</p>
              </div>
            ))}
          </DetailRow>
        )}

        {contact.company && (
          <DetailRow icon={<Building2 className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            <div>
              <p className={cn("text-sm", CONTACTS_HEADING_TEXT)}>{contact.company}</p>
              {contact.department && (
                <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{contact.department}</p>
              )}
              {contact.jobTitle && (
                <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{contact.jobTitle}</p>
              )}
            </div>
          </DetailRow>
        )}

        {contact.addresses && contact.addresses.length > 0 && (
          <DetailRow icon={<MapPin className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            {contact.addresses.map((addr, i) => (
              <div key={i}>
                <p className={cn("text-sm", CONTACTS_HEADING_TEXT)}>
                  {[addr.street, [addr.postalCode, addr.city].filter(Boolean).join(" "), addr.region, addr.country]
                    .filter(Boolean)
                    .join(", ")}
                </p>
                <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{addr.label}</p>
              </div>
            ))}
          </DetailRow>
        )}

        {contact.birthday && (contact.birthday.day || contact.birthday.month) && (
          <DetailRow icon={<Cake className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            <p className={cn("text-sm", CONTACTS_HEADING_TEXT)}>{formatBirthday(contact.birthday)}</p>
          </DetailRow>
        )}

        {contact.notes && (
          <DetailRow icon={<FileText className={cn("h-5 w-5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
            <p className={cn("whitespace-pre-wrap text-sm", CONTACTS_HEADING_TEXT)}>{contact.notes}</p>
          </DetailRow>
        )}
      </div>

      <ContactImproveDialog
        contact={contact}
        open={improveOpen}
        onOpenChange={setImproveOpen}
      />
    </div>
  )
}

function DetailRow({ icon, children }: { icon: React.ReactNode; children: React.ReactNode }) {
  return (
    <div className="flex gap-4 py-3">
      <div className="flex w-6 shrink-0 pt-0.5">{icon}</div>
      <div className="flex-1 space-y-2">{children}</div>
    </div>
  )
}