const { roleOf } = require("./permissions");

const PLATFORM_DEFAULTS = {
  discord: { markdown: true, html: false, reply_thread: true, max: 1900 },
  twitch: { markdown: false, html: false, reply_thread: false, max: 450 },
  youtube: { markdown: false, html: false, reply_thread: false, max: 1800 },
  kick: { markdown: false, html: false, reply_thread: false, max: 450 },
  webui: { markdown: false, html: true, reply_thread: false, max: 4000 },
  other: { markdown: false, html: false, reply_thread: false, max: 1000 }
};

function buildOriginContext(ctx, command = "assistant") {
  const platform = ctx.platform || "other";
  const defaults = PLATFORM_DEFAULTS[platform] || PLATFORM_DEFAULTS.other;
  const role = inferRole(ctx);
  return {
    origin: platform,
    platform,
    channel_id: ctx.meta?.message?.channelId || ctx.meta?.channel || ctx.meta?.liveChatId || null,
    channel_name: ctx.meta?.message?.channel?.name || ctx.meta?.channel || null,
    server_id: ctx.meta?.message?.guildId || null,
    user_id: ctx.user?.id || null,
    username: ctx.user?.username || ctx.platformUser?.username || null,
    display_name: ctx.user?.displayName || ctx.platformUser?.displayName || null,
    role,
    is_admin: role === "admin",
    is_mod: role === "mod",
    message_id: ctx.meta?.message?.id || ctx.meta?.messageId || null,
    reply_mode: defaults.reply_thread ? "thread" : "same_channel",
    format_capabilities: { markdown: defaults.markdown, html: defaults.html },
    max_message_length: defaults.max,
    source_plugin: "lumi_ai",
    source_command: command,
    permission_context: {
      identified_user: Boolean(ctx.user?.id),
      webui_actions_allowed: false
    }
  };
}

function formatPlatformReply(text, links, origin) {
  return formatPlatformReplyDetails(text, links, origin).text;
}

function formatPlatformReplyDetails(text, links, origin) {
  let output = String(text || "").trim();
  const safeLinks = Array.isArray(links)
    ? links.filter((link) => /^https?:\/\//i.test(link?.href || "") || link?.href?.startsWith("/"))
    : [];
  if (safeLinks.length) {
    const paths = safeLinks.map((link) => origin.format_capabilities.markdown
      ? `[${link.label}](${link.href})`
      : `${link.label}: ${link.href}`).join(" | ");
    output = `${output} ${paths}`.trim();
  }
  if (!origin.format_capabilities.markdown) {
    output = output.replace(/[*_`~]/g, "").replace(/\[([^\]]+)\]\(([^)]+)\)/g, "$1: $2");
  }
  output = output.replace(/<[^>]+>/g, "").replace(/\s+/g, " ").trim();
  const originalLength = output.length;
  const delivered = truncate(output, origin.max_message_length);
  return {
    text: delivered,
    original_final_length: originalLength,
    delivered_length: delivered.length
  };
}

function inferRole(ctx) {
  if (ctx.isAdmin || ctx.user?.isAdmin || hasPermission(ctx, ["Administrator", "ADMINISTRATOR"])) return "admin";
  const tags = ctx.meta?.tags || {};
  if (ctx.isMod || ctx.user?.isMod || hasPermission(ctx, ["ManageMessages", "MANAGE_MESSAGES"]) ||
    tags.mod === "1" || tags.badges?.broadcaster === "1" || tags.badges?.moderator === "1") return "mod";
  return roleOf(ctx.user);
}

function hasPermission(ctx, names) {
  const permissions = ctx.meta?.message?.member?.permissions;
  if (!permissions?.has) return false;
  return names.some((name) => {
    try { return Boolean(permissions.has(name)); } catch { return false; }
  });
}

function truncate(value, max) {
  if (value.length <= max) return value;
  const suffix = " [reply truncated]";
  return `${value.slice(0, Math.max(1, max - suffix.length)).trimEnd()}${suffix}`;
}

module.exports = { PLATFORM_DEFAULTS, buildOriginContext, formatPlatformReply, formatPlatformReplyDetails, inferRole };