"use client"

import { useMemo, useState } from "react"
import {
  Pencil,
  Sparkles,
  Star,
  X,
  Mail,
  Phone,
  Building2,
  MapPin,
  Cake,
  FileText,
  MessageSquare,
  Video,
} from "lucide-react"
import { Button } from "@/components/ui/button"
import { ScrollArea } from "@/components/ui/scroll-area"
import { useContactsStore } from "@/lib/contacts/contacts-store"
import { useContactsList } from "@/lib/contacts/use-contacts-list"
import { ContactAvatar } from "@/components/gmail/contacts/contact-avatar"
import { fullContactDisplayName } from "@/lib/contacts/types"
import { useMailSearch } from "@/lib/api/hooks/use-mail-queries"
import { useComposeActions } from "@/lib/compose-context"
import { useNavStore } from "@/lib/stores/nav-store"
import {
  CONTACTS_HEADING_TEXT,
  CONTACTS_MUTED_TEXT,
  CONTACTS_PANEL_DIVIDER_CLASS,
  CONTACTS_PANEL_HEADER_CLASS,
  CONTACTS_PANEL_ICON_BTN_CLASS,
  CONTACTS_PANEL_MUTED_ICON_CLASS,
  CONTACTS_PANEL_PRIMARY_ACTION_CLASS,
  CONTACTS_PANEL_ROW_CLASS,
  CONTACTS_PANEL_SECONDARY_ICON_BTN_CLASS,
  CONTACTS_PANEL_SHELL_CLASS,
  CONTACTS_PANEL_TAG_CLASS,
} from "@/lib/contacts-chrome-classes"
import { cn } from "@/lib/utils"
import { ContactsPanelLogo } from "./contacts-panel-logo"
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"

interface ContactDetailViewProps {
  contactId: string | null
}

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(" ")
}

function formatEmailDate(iso: string): string {
  const d = new Date(iso)
  const now = new Date()
  const diffDays = Math.floor((now.getTime() - d.getTime()) / 86_400_000)
  if (diffDays === 0) return "Aujourd'hui"
  if (diffDays === 1) return "Hier"
  if (diffDays < 7) return `Il y a ${diffDays} jours`
  return d.toLocaleDateString("fr-FR", { day: "numeric", month: "short", year: "numeric" })
}

export function ContactDetailView({ contactId }: ContactDetailViewProps) {
  const { setView, showContactsList, closePanel } = useContactsStore()
  const { contacts } = useContactsList()
  const { openComposeWithInitial } = useComposeActions()
  const labelRows = useNavStore((s) => s.labelRows)
  const { data: llmSettings } = useLLMSettings()
  const [improveOpen, setImproveOpen] = useState(false)
  const llmReady = isLLMConfigured(llmSettings)

  const contact = contacts.find((c) => c.id === contactId)

  const primaryContactEmail = contact?.emails[0]?.value
  const { data: searchResult } = useMailSearch(
    primaryContactEmail ? { from: primaryContactEmail } : null
  )
  const recentInteractions = useMemo(() => {
    if (!searchResult?.data) return []
    return searchResult.data.slice(0, 10).map((msg) => ({
      id: msg.id,
      subject: msg.subject,
      preview: msg.snippet,
      date: msg.date,
    }))
  }, [searchResult])

  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

  return (
    <div className={cn("flex h-full min-w-0 flex-col overflow-hidden", CONTACTS_PANEL_SHELL_CLASS)}>
      {/* Header */}
      <div className={CONTACTS_PANEL_HEADER_CLASS}>
        <ContactsPanelLogo onClick={showContactsList} className="-ml-1" />
        <div className="flex items-center gap-1">
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className={CONTACTS_PANEL_ICON_BTN_CLASS}
            onClick={() => setImproveOpen(true)}
            disabled={!llmReady}
            aria-label="Amélioration IA"
            title={
              llmReady
                ? "Améliorer la fiche avec l'IA"
                : "Configurez un fournisseur LLM dans les réglages contacts"
            }
          >
            <Sparkles className="h-4 w-4 text-amber-500" />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className={CONTACTS_PANEL_ICON_BTN_CLASS}
            onClick={() => setView("edit", contactId)}
            aria-label="Modifier"
          >
            <Pencil className="h-4 w-4" />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className={CONTACTS_PANEL_ICON_BTN_CLASS}
          >
            <Star className="h-4 w-4" />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className={CONTACTS_PANEL_ICON_BTN_CLASS}
            onClick={closePanel}
          >
            <X className="h-4 w-4" />
          </Button>
        </div>
      </div>

      <ScrollArea className="min-h-0 min-w-0 flex-1 overflow-hidden [&_[data-slot=scroll-area-viewport]>div]:!block [&_[data-slot=scroll-area-viewport]>div]:min-w-0 [&_[data-slot=scroll-area-viewport]>div]:max-w-full">
        <div className="w-full min-w-0 max-w-full overflow-x-hidden">
        {/* Avatar + Name */}
        <div className="flex flex-col items-center px-4 pt-6 pb-4">
          <ContactAvatar contact={contact} name={name} size="lg" />
          <h2 className={cn("mt-3 max-w-full truncate px-2 text-center text-lg font-medium", CONTACTS_HEADING_TEXT)}>
            {name}
          </h2>
          {contact.company && (
            <p className={cn("max-w-full truncate px-2 text-center text-sm", 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 (
                  <span
                    key={labelId}
                    className={CONTACTS_PANEL_TAG_CLASS}
                  >
                    {row && (
                      <span className={`inline-block h-2 w-2 rounded-full ${row.color}`} />
                    )}
                    {row?.label ?? labelId}
                  </span>
                )
              })}
            </div>
          )}
        </div>

        {/* Quick actions */}
        <div className="flex min-w-0 flex-col items-center gap-2 px-4 pb-4">
          <Button
            type="button"
            variant="outline"
            size="sm"
            className="w-full max-w-xs 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>
        {primaryEmail && (
          <div className="flex min-w-0 flex-wrap items-center justify-center gap-2">
            <button
              type="button"
              className={CONTACTS_PANEL_PRIMARY_ACTION_CLASS}
              onClick={() =>
                openComposeWithInitial({
                  to: [{ name: displayName, email: primaryEmail }],
                })
              }
            >
              <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>

        {/* Contact details */}
        <div className={cn("min-w-0", CONTACTS_PANEL_DIVIDER_CLASS)}>
          {contact.emails.length > 0 && (
            <DetailSection icon={<Mail className={cn("h-4.5 w-4.5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
              {contact.emails.map((e, i) => (
                <div key={i}>
                  <p className="truncate text-sm text-primary">{e.value}</p>
                  <p className={cn("text-xs", CONTACTS_MUTED_TEXT)}>{e.label}</p>
                </div>
              ))}
            </DetailSection>
          )}

          {contact.phones.length > 0 && (
            <DetailSection icon={<Phone className={cn("h-4.5 w-4.5", 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>
              ))}
            </DetailSection>
          )}

          {contact.company && (
            <DetailSection icon={<Building2 className={cn("h-4.5 w-4.5", 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>
            </DetailSection>
          )}

          {contact.addresses && contact.addresses.length > 0 && (
            <DetailSection icon={<MapPin className={cn("h-4.5 w-4.5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
              {contact.addresses.map((addr, i) => (
                <div key={i}>
                  <p className={cn("break-words text-sm [overflow-wrap:anywhere]", 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>
              ))}
            </DetailSection>
          )}

          {contact.birthday && (contact.birthday.day || contact.birthday.month) && (
            <DetailSection icon={<Cake className={cn("h-4.5 w-4.5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
              <p className={cn("text-sm", CONTACTS_HEADING_TEXT)}>{formatBirthday(contact.birthday)}</p>
            </DetailSection>
          )}

          {contact.notes && (
            <DetailSection icon={<FileText className={cn("h-4.5 w-4.5", CONTACTS_PANEL_MUTED_ICON_CLASS)} />}>
              <p className={cn("whitespace-pre-wrap text-sm", CONTACTS_HEADING_TEXT)}>{contact.notes}</p>
            </DetailSection>
          )}
        </div>

        {/* Recent interactions */}
        {recentInteractions.length > 0 && (
          <div className={cn("min-w-0 overflow-hidden pt-3 pb-4", CONTACTS_PANEL_DIVIDER_CLASS)}>
            <h3 className={cn("px-4 pb-2 text-xs font-medium uppercase", CONTACTS_MUTED_TEXT)}>
              Interactions récentes
            </h3>
            {recentInteractions.map((email) => (
              <div
                key={email.id}
                className={cn("flex min-w-0 gap-3 overflow-hidden px-4 py-2", CONTACTS_PANEL_ROW_CLASS)}
              >
                <Mail className={cn("mt-0.5 h-4 w-4 shrink-0", CONTACTS_PANEL_MUTED_ICON_CLASS)} />
                <div className="min-w-0 flex-1 overflow-hidden">
                  <p className={cn("truncate text-sm", CONTACTS_HEADING_TEXT)}>{email.subject}</p>
                  <p className={cn("line-clamp-2 break-words [overflow-wrap:anywhere] text-xs", CONTACTS_MUTED_TEXT)}>
                    {email.preview}
                  </p>
                  <p className={cn("mt-0.5 text-xs", CONTACTS_MUTED_TEXT)}>{formatEmailDate(email.date)}</p>
                </div>
              </div>
            ))}
          </div>
        )}

        </div>
      </ScrollArea>

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

function DetailSection({
  icon,
  children,
}: {
  icon: React.ReactNode
  children: React.ReactNode
}) {
  return (
    <div className="flex min-w-0 gap-3 px-4 py-3">
      <div className="flex w-5 shrink-0 pt-0.5">{icon}</div>
      <div className="min-w-0 flex-1 space-y-2 overflow-hidden">{children}</div>
    </div>
  )
}