"use client"

import { useMemo, useState } from "react"
import { Star, Info } from "lucide-react"
import { useMessage } from "@/lib/api/hooks/use-mail-queries"
import {
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from "@/components/ui/tooltip"
import { cn } from "@/lib/utils"
import { mailFlagIsStarred, messageIsSpam } from "@/lib/mail-flags"
import {
  avatarColor,
  cleanSenderName,
  senderInitial,
} from "@/lib/sender-display"
import { MailDateText } from "@/components/gmail/mail-date-text"
import type { ApiMessageFull, Recipient } from "@/lib/api/types"
import { resolveMessageFrom } from "@/lib/mail-message-participants"
import {
  buildMessageHeaderDetails,
  type MessageHeaderDetails,
} from "@/lib/mail-message-header-details"
import type { EmailAttachment } from "@/lib/email-data"
import { ContactHoverCard } from "@/components/gmail/contact-hover-card"
import { EmailViewMessageToolbar } from "@/components/gmail/email-view/email-view-toolbar"
import { MessageBodyContent } from "@/components/gmail/email-view/message-body-content"
import { MessageAttachmentsSection } from "@/components/gmail/email-view/message-attachments"
import {
  MAIL_MESSAGE_HOVER_CLASS,
  MAIL_TOOLTIP_CONTENT_CLASS,
} from "@/lib/mail-chrome-classes"
import { repairMimeBodies } from "@/lib/mail-mime-body"
import { plainTextToDisplayHtml } from "@/lib/mail-plain-text-html"

export function plainTextBodyFallback(
  full: { body_text?: string; body_html?: string } | null | undefined
): string | undefined {
  const { bodyText } = repairMimeBodies(full?.body_text, full?.body_html)
  const t = bodyText?.trim()
  return t || undefined
}

export function formatApiMessageBody(
  full: { body_html?: string; body_text?: string } | null | undefined,
  snippet: string | undefined,
  loading: boolean
): string {
  const snippetHtml = snippet?.trim()
    ? `<p style="color:var(--muted-foreground);">${snippet.trim()}</p>`
    : ""

  if (loading) {
    return snippetHtml
  }
  const repaired = repairMimeBodies(full?.body_text, full?.body_html)
  const html = repaired.bodyHtml?.trim()
  if (html) return html
  const text = repaired.bodyText?.trim()
  if (text) {
    return plainTextToDisplayHtml(text)
  }
  if (full) {
    const s = snippet?.trim()
    if (s) {
      return `<p style="color:var(--muted-foreground);">${s}</p>`
    }
    return `<p style="color:var(--muted-foreground);">Ce message n’a pas de contenu.</p>`
  }
  const s = snippet?.trim()
  return s
    ? `<p style="color:var(--muted-foreground);">${s}</p>`
    : ""
}


/** Prior message in a thread: loads full body on expand via GET /mail/messages/:id. */
export function ThreadPriorMessage({
  message,
  isExpanded,
  onToggle,
  onPrintConversation,
  onReply,
  onForward,
  selfEmails,
  selfDisplayName,
  collapseQuotedReplies = false,
}: {
  message: ApiMessageFull
  isExpanded: boolean
  onToggle: () => void
  onPrintConversation?: () => void
  onReply?: () => void
  onForward?: () => void
  selfEmails: string[]
  selfDisplayName?: string
  collapseQuotedReplies?: boolean
}) {
  const [detailsOpen, setDetailsOpen] = useState(false)
  const loadFull = isExpanded || detailsOpen
  const { data: fullMessage, isPending } = useMessage(loadFull ? message.id : null)
  const merged = fullMessage ?? message
  const resolved = useMemo(
    () =>
      resolveMessageFrom(merged.from, { selfEmails, selfDisplayName }),
    [merged.from, selfEmails, selfDisplayName]
  )
  const headerDetails = useMemo(
    () =>
      buildMessageHeaderDetails(merged, {
        selfEmails,
        selfDisplayName,
        subject: message.subject,
      }),
    [merged, selfEmails, selfDisplayName, message.subject]
  )
  const body = useMemo(
    () =>
      formatApiMessageBody(
        fullMessage,
        message.snippet,
        isExpanded && isPending && !fullMessage
      ),
    [fullMessage, message.snippet, isExpanded, isPending]
  )
  const plainTextFallback = useMemo(
    () => plainTextBodyFallback(fullMessage),
    [fullMessage]
  )

  const isSpam = messageIsSpam(merged.flags, merged.labels)

  if (!isExpanded) {
    return (
      <CollapsedMessage
        message={message}
        senderName={resolved.name}
        senderEmail={resolved.email}
        onClick={onToggle}
      />
    )
  }

  return (
    <ExpandedMessage
      sender={resolved.name}
      senderEmail={resolved.email}
      headerDetails={headerDetails}
      dateIso={message.date}
      body={body}
      isSpam={isSpam}
      isLast={false}
      starred={mailFlagIsStarred(message.flags ?? [])}
      onCollapse={onToggle}
      onPrintConversation={onPrintConversation}
      onReply={onReply}
      onForward={onForward}
      detailsOpen={detailsOpen}
      onDetailsOpenChange={setDetailsOpen}
      collapseQuotedReplies={collapseQuotedReplies}
      messageId={message.id}
      plainTextFallback={plainTextFallback}
    />
  )
}

export function CollapsedMessage({
  message,
  senderName: senderNameProp,
  senderEmail: senderEmailProp,
  onClick,
}: {
  message: ApiMessageFull
  senderName?: string
  senderEmail?: string
  onClick: () => void
}) {
  const senderName = senderNameProp ?? message.from[0]?.name ?? ""
  const senderAddr = senderEmailProp ?? message.from[0]?.address ?? ""
  const name = cleanSenderName(senderName || senderAddr)
  const color = avatarColor(name)

  return (
    <div
      role="button"
      tabIndex={0}
      onClick={onClick}
      onKeyDown={(e) => {
        if (e.key === "Enter" || e.key === " ") {
          e.preventDefault()
          onClick()
        }
      }}
      className={cn("group flex w-full cursor-pointer items-center gap-3 px-4 py-3 text-left transition-colors", MAIL_MESSAGE_HOVER_CLASS)}
    >
      <div
        className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full text-sm font-bold text-white"
        style={{ backgroundColor: color }}
      >
        {senderInitial(name)}
      </div>
      <div className="min-w-0 flex-1 flex flex-col gap-1" data-selectable-text>
        <div className="flex min-w-0 items-center justify-between gap-2">
          <ContactHoverCard displayName={senderName} email={senderAddr} className="min-w-0">
            <span className="truncate text-sm font-semibold text-foreground">{name}</span>
          </ContactHoverCard>
          <div className="flex shrink-0 items-center gap-1">
            <MailDateText
              iso={message.date}
              variant="preview"
              className="text-xs text-muted-foreground"
            />
            <Star
              strokeWidth={1.25}
              className="ml-1 size-4 fill-transparent stroke-[#c2c2c2]"
            />
          </div>
        </div>
        <p className="min-w-0 truncate text-sm leading-snug text-muted-foreground">{message.snippet}</p>
      </div>
    </div>
  )
}

export function ExpandedMessage({
  sender,
  senderEmail,
  headerDetails,
  dateIso,
  body,
  isSpam,
  isLast,
  starred,
  attachments = [],
  onToggleStar,
  onCollapse,
  onPrintConversation,
  onReply,
  onForward,
  detailsOpen,
  onDetailsOpenChange,
  collapseQuotedReplies = false,
  messageId,
  plainTextFallback,
}: {
  sender: string
  senderEmail: string
  headerDetails: MessageHeaderDetails
  messageId: string
  dateIso: string
  body: string
  isSpam: boolean
  isLast: boolean
  starred: boolean
  attachments?: EmailAttachment[]
  onToggleStar?: () => void
  onCollapse?: () => void
  onPrintConversation?: () => void
  onReply?: () => void
  onForward?: () => void
  detailsOpen?: boolean
  onDetailsOpenChange?: (open: boolean) => void
  collapseQuotedReplies?: boolean
  plainTextFallback?: string
}) {
  return (
    <div>
      <EmailViewMessageToolbar
        sender={sender}
        senderEmail={senderEmail}
        headerDetails={headerDetails}
        dateIso={dateIso}
        isSpam={isSpam}
        isLast={isLast}
        starred={starred}
        onToggleStar={onToggleStar}
        onCollapse={onCollapse}
        onPrintConversation={onPrintConversation}
        onReply={onReply}
        onForward={onForward}
        detailsOpen={detailsOpen}
        onDetailsOpenChange={onDetailsOpenChange}
        messageId={messageId}
      />

      <div
        className={cn(
          "px-4 pl-[68px] max-sm:pl-4 max-sm:pr-4",
          attachments.length > 0 ? "pb-0" : "pb-4"
        )}
        data-selectable-text
      >
        <MessageBodyContent
          html={body}
          isSpam={isSpam}
          senderEmail={senderEmail}
          messageId={messageId}
          collapseQuotedReplies={collapseQuotedReplies}
          plainTextFallback={plainTextFallback}
        />
      </div>

      {attachments.length > 0 && (
        <MessageAttachmentsSection attachments={attachments} />
      )}
    </div>
  )
}

export function SpamWhyBanner({ onNotSpam }: { onNotSpam?: () => void }) {
  return (
    <div className="mx-6 mb-4 flex items-start gap-3 rounded-lg border border-border bg-muted px-4 py-3.5 max-sm:mx-4">
      <div className="min-w-0 flex-1 space-y-3">
        <p className="text-sm leading-snug text-foreground/80">
          <span className="font-medium text-foreground">Pourquoi ce message est-il dans le spam ?</span>{" "}
          Ce message est semblable à des messages identifiés comme spam par le passé.
        </p>
        {onNotSpam && (
          <button
            type="button"
            onClick={onNotSpam}
            className="rounded-md border border-border bg-mail-surface px-4 py-2 text-sm font-medium text-primary shadow-sm transition-colors hover:bg-accent"
          >
            Signaler comme non-spam
          </button>
        )}
      </div>
      <Tooltip>
        <TooltipTrigger asChild>
          <button
            type="button"
            className="mt-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-full text-muted-foreground hover:bg-accent"
            aria-label="En savoir plus sur le filtre anti-spam"
          >
            <Info className="h-[18px] w-[18px]" strokeWidth={1.75} />
          </button>
        </TooltipTrigger>
        <TooltipContent side="left" className={cn(MAIL_TOOLTIP_CONTENT_CLASS, "max-w-xs text-xs")}>
          Les filtres peuvent se tromper. Si le message est légitime, signalez-le comme non-spam pour
          l&apos;améliorer.
        </TooltipContent>
      </Tooltip>
    </div>
  )
}