"use client";
import type { MailMessage } from "@/app/dashboard/mail/page";
import { formatBytes } from "@/lib/format";

function getFileIcon(contentType: string, filename: string): string {
  if (contentType.startsWith("image/")) return "🖼️";
  if (contentType === "application/pdf") return "📄";
  if (contentType.includes("zip") || contentType.includes("rar") || contentType.includes("tar")) return "📦";
  if (contentType.includes("word") || filename.endsWith(".doc") || filename.endsWith(".docx")) return "📝";
  if (contentType.includes("sheet") || contentType.includes("excel") || filename.endsWith(".xls")) return "📊";
  if (contentType.includes("presentation") || filename.endsWith(".ppt")) return "📑";
  if (contentType.startsWith("video/")) return "🎬";
  if (contentType.startsWith("audio/")) return "🎵";
  return "📎";
}

function canPreview(contentType: string): boolean {
  return contentType.startsWith("image/") || contentType === "application/pdf";
}

export default function MessageView({ message, onReply, onDelete, folder }: {
  message: MailMessage;
  onReply: () => void;
  onDelete: () => void;
  folder: string;
}) {
  const from = message.from[0];
  const date = new Date(message.date).toLocaleString("tr-TR", {
    day: "numeric", month: "long", year: "numeric", hour: "2-digit", minute: "2-digit",
  });

  const downloadUrl = (filename: string) =>
    `/api/mail/messages/${message.uid}/attachments?folder=${encodeURIComponent(folder)}&filename=${encodeURIComponent(filename)}`;

  const handleAttachment = (att: { filename: string; contentType: string }, preview: boolean) => {
    const url = downloadUrl(att.filename);
    if (preview && canPreview(att.contentType)) {
      window.open(url, "_blank");
    } else {
      const a = document.createElement("a");
      a.href = url;
      a.download = att.filename;
      a.click();
    }
  };

  return (
    <div className="message-view">
      {/* Header */}
      <div className="message-view-header">
        <h2 className="message-view-subject">{message.subject}</h2>
        <div className="message-view-actions">
          <button className="btn btn-ghost btn-sm" onClick={onReply} title="Yanıtla">
            <ReplyIcon /> Yanıtla
          </button>
          <button className="btn btn-danger btn-sm" onClick={onDelete} title="Sil">
            <TrashIcon /> Sil
          </button>
        </div>
      </div>

      {/* Meta */}
      <div className="message-view-meta">
        <div className="message-view-avatar">{(from?.name || from?.address)?.[0]?.toUpperCase() ?? "?"}</div>
        <div style={{ flex: 1, minWidth: 0 }}>
          <div style={{ fontWeight: 600, fontSize: 13 }}>{from?.name || from?.address}</div>
          <div style={{ fontSize: 11, color: "var(--text-muted)" }}>
            {from?.address}
            {message.to.length > 0 && <> → {message.to.map((t) => t.address).join(", ")}</>}
          </div>
        </div>
        <div style={{ fontSize: 11, color: "var(--text-muted)", flexShrink: 0 }}>{date}</div>
      </div>

      {/* Attachments */}
      {message.attachments.length > 0 && (
        <div className="message-attachments">
          <div style={{ width: "100%", fontSize: 12, fontWeight: 600, color: "var(--text-secondary)", marginBottom: 6 }}>
            📎 {message.attachments.length} ek
          </div>
          {message.attachments.map((att, i) => (
            <div key={i} className="attachment-chip" onClick={() => handleAttachment(att, false)}>
              <span>{getFileIcon(att.contentType, att.filename)}</span>
              <span style={{ maxWidth: 160, overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>
                {att.filename}
              </span>
              <span style={{ color: "var(--text-muted)", fontSize: 11 }}>{formatBytes(att.size)}</span>
              <span className="attachment-actions">
                <button
                  className="att-btn"
                  onClick={(e) => { e.stopPropagation(); handleAttachment(att, false); }}
                  title="İndir"
                >
                  ⬇
                </button>
                {canPreview(att.contentType) && (
                  <button
                    className="att-btn"
                    onClick={(e) => { e.stopPropagation(); handleAttachment(att, true); }}
                    title="Önizle"
                  >
                    👁
                  </button>
                )}
              </span>
            </div>
          ))}
        </div>
      )}

      {/* Body */}
      <div className="message-view-body">
        {message.html ? (
          <iframe
            srcDoc={sanitizeHtml(message.html)}
            sandbox="allow-same-origin"
            style={{ width: "100%", border: "none", minHeight: 400 }}
            onLoad={(e) => {
              const iframe = e.target as HTMLIFrameElement;
              if (iframe.contentDocument) {
                iframe.style.height = iframe.contentDocument.body.scrollHeight + 20 + "px";
              }
            }}
          />
        ) : (
          <pre style={{ whiteSpace: "pre-wrap", fontFamily: "inherit", fontSize: 13, color: "var(--text-secondary)" }}>
            {message.text}
          </pre>
        )}
      </div>
    </div>
  );
}

function sanitizeHtml(html: string): string {
  const style = `<style>
    body { font-family: Inter, -apple-system, sans-serif; font-size: 14px; color: #c9d1d9; background: transparent; margin: 0; padding: 8px; line-height: 1.6; }
    a { color: #58a6ff; }
    img { max-width: 100%; height: auto; }
  </style>`;
  let clean = html.replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, "");
  clean = clean.replace(/\son\w+\s*=\s*["'][^"']*["']/gi, "");
  return `<!DOCTYPE html><html><head>${style}</head><body>${clean}</body></html>`;
}

function ReplyIcon() { return <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><polyline points="9 17 4 12 9 7"/><path d="M20 18v-2a4 4 0 0 0-4-4H4"/></svg>; }
function TrashIcon() { return <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M3 6h18"/><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"/><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"/></svg>; }