import fs from "node:fs";
import path from "node:path";
import { normalizeE164 } from "openclaw/plugin-sdk/account-resolution";
import { logVerbose, shouldLogVerbose } from "openclaw/plugin-sdk/runtime-env";
import { escapeRegExp } from "openclaw/plugin-sdk/text-runtime";
import { CONFIG_DIR, resolveUserPath } from "openclaw/plugin-sdk/text-runtime";

const WHATSAPP_FENCE_PLACEHOLDER = "\x00FENCE";
const WHATSAPP_INLINE_CODE_PLACEHOLDER = "\x00CODE";

export type WebChannel = "web";

export function assertWebChannel(input: string): asserts input is WebChannel {
  if (input !== "web") {
    throw new Error("Web channel must be 'web'");
  }
}

export function isSelfChatMode(
  selfE164: string | null | undefined,
  allowFrom?: Array<string | number> | null,
): boolean {
  if (!selfE164) {
    return false;
  }
  if (!Array.isArray(allowFrom) || allowFrom.length === 0) {
    return false;
  }
  const normalizedSelf = normalizeE164(selfE164);
  return allowFrom.some((n) => {
    if (n === "*") {
      return false;
    }
    try {
      return normalizeE164(String(n)) === normalizedSelf;
    } catch {
      return false;
    }
  });
}

export function toWhatsappJid(number: string): string {
  const withoutPrefix = number.replace(/^whatsapp:/i, "").trim();
  if (withoutPrefix.includes("@")) {
    return withoutPrefix;
  }
  const e164 = normalizeE164(withoutPrefix);
  const digits = e164.replace(/\D/g, "");
  return `${digits}@s.whatsapp.net`;
}

export type JidToE164Options = {
  authDir?: string;
  lidMappingDirs?: string[];
  logMissing?: boolean;
};

type LidLookup = {
  getPNForLID?: (jid: string) => Promise<string | null>;
};

function resolveLidMappingDirs(params: { opts?: JidToE164Options }): string[] {
  const dirs = new Set<string>();
  const addDir = (dir?: string | null) => {
    if (!dir) {
      return;
    }
    dirs.add(resolveUserPath(dir));
  };
  addDir(params.opts?.authDir);
  for (const dir of params.opts?.lidMappingDirs ?? []) {
    addDir(dir);
  }
  addDir(CONFIG_DIR);
  addDir(path.join(CONFIG_DIR, "credentials"));
  return [...dirs];
}

function readLidReverseMapping(params: { lid: string; opts?: JidToE164Options }): string | null {
  const mappingFilename = `lid-mapping-${params.lid}_reverse.json`;
  const mappingDirs = resolveLidMappingDirs({ opts: params.opts });
  for (const dir of mappingDirs) {
    const mappingPath = path.join(dir, mappingFilename);
    try {
      const data = fs.readFileSync(mappingPath, "utf8");
      const phone = JSON.parse(data) as string | number | null;
      if (phone === null || phone === undefined) {
        continue;
      }
      return normalizeE164(String(phone));
    } catch {
      // next location
    }
  }
  return null;
}

export function jidToE164(jid: string, opts?: JidToE164Options): string | null {
  const match = jid.match(/^(\d+)(?::\d+)?@(s\.whatsapp\.net|hosted)$/);
  if (match) {
    return `+${match[1]}`;
  }

  const lidMatch = jid.match(/^(\d+)(?::\d+)?@(lid|hosted\.lid)$/);
  if (!lidMatch) {
    return null;
  }
  const phone = readLidReverseMapping({
    lid: lidMatch[1],
    opts,
  });
  if (phone) {
    return phone;
  }
  const shouldLog = opts?.logMissing ?? shouldLogVerbose();
  if (shouldLog) {
    logVerbose(`LID mapping not found for ${lidMatch[1]}; skipping inbound message`);
  }
  return null;
}

export async function resolveJidToE164(
  jid: string | null | undefined,
  opts?: JidToE164Options & { lidLookup?: LidLookup },
): Promise<string | null> {
  if (!jid) {
    return null;
  }
  const direct = jidToE164(jid, opts);
  if (direct) {
    return direct;
  }
  if (!/(@lid|@hosted\.lid)$/.test(jid) || !opts?.lidLookup?.getPNForLID) {
    return null;
  }
  try {
    const pnJid = await opts.lidLookup.getPNForLID(jid);
    if (!pnJid) {
      return null;
    }
    return jidToE164(pnJid, opts);
  } catch (err) {
    if (shouldLogVerbose()) {
      logVerbose(`LID mapping lookup failed for ${jid}: ${String(err)}`);
    }
    return null;
  }
}

export function markdownToWhatsApp(text: string): string {
  if (!text) {
    return text;
  }

  const fences: string[] = [];
  let result = text.replace(/```[\s\S]*?```/g, (match) => {
    fences.push(match);
    return `${WHATSAPP_FENCE_PLACEHOLDER}${fences.length - 1}`;
  });

  const inlineCodes: string[] = [];
  result = result.replace(/`[^`\n]+`/g, (match) => {
    inlineCodes.push(match);
    return `${WHATSAPP_INLINE_CODE_PLACEHOLDER}${inlineCodes.length - 1}`;
  });

  result = result.replace(/\*\*(.+?)\*\*/g, "*$1*");
  result = result.replace(/__(.+?)__/g, "*$1*");
  result = result.replace(/~~(.+?)~~/g, "~$1~");

  result = result.replace(
    new RegExp(`${escapeRegExp(WHATSAPP_INLINE_CODE_PLACEHOLDER)}(\\d+)`, "g"),
    (_, idx) => inlineCodes[Number(idx)] ?? "",
  );
  result = result.replace(
    new RegExp(`${escapeRegExp(WHATSAPP_FENCE_PLACEHOLDER)}(\\d+)`, "g"),
    (_, idx) => fences[Number(idx)] ?? "",
  );
  return result;
}