export function formatSize(bytes: number) {
  if (bytes < 1024) return `${bytes} bytes`;
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
  if (bytes < 1024 * 1024 * 1024) {
    return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
  }
  return `${(bytes / 1024 / 1024 / 1024).toFixed(1)} GB`;
}
export function formatDate(date: Date) {
  // YYYY-MM-DD, format in PST timezone
  return date.toLocaleDateString("sv", { timeZone: "America/Los_Angeles" });
}
export function formatShortDate(date: Date) {
  // YY-MM-DD, format in PST timezone
  return formatDate(date).slice(2);
}
export function formatDuration(seconds: number) {
  const minutes = Math.floor(seconds / 60);
  const remainingSeconds = seconds % 60;
  return `${minutes}:${remainingSeconds.toString().padStart(2, "0")}`;
}
export const escapeUri = (uri: string) =>
  encodeURIComponent(uri)
    .replace(/%2F/gi, "/")
    .replace(/%3A/gi, ":")
    .replace(/%2B/gi, "+")
    .replace(/%40/gi, "@")
    .replace(/%2D/gi, "-")
    .replace(/%5F/gi, "_")
    .replace(/%2E/gi, ".")
    .replace(/%2C/gi, ",");

import type { MediaFile } from "../db.ts";
import { escapeHTML } from "../framework/bun-polyfill.ts";
const findDomain = "paperclover.net";

// Returns escaped HTML
// Features:
// - autolink detection
//   - via \bpaperclover.net/[a-zA-Z0-9_\.+-]+
//   - via \b/file/[a-zA-Z0-9_\.+-]+
//   - via \bhttps://...
//   - via name of a sibling file's basename
// - reformat (c) into ©
//
// This formatter was written with AI.
export function highlightLinksInTextView(
  text: string,
  siblingFiles: MediaFile[] = [],
) {
  const siblingLookup = Object.fromEntries(
    siblingFiles
      .filter((f) => f.basename !== "readme.txt")
      .map((f) => [f.basename, f]),
  );

  // First escape the HTML to prevent XSS
  let processedText = escapeHTML(text);

  // Replace (c) with ©
  processedText = processedText.replace(/\(c\)/gi, "©");

  // Process all URL patterns in a single pass to avoid nested links
  // This regex matches:
  // 1. https:// or http:// URLs
  // 2. domain URLs without protocol (e.g., paperclover.net/path)
  // 3. /file/ URLs
  // 4. ./ relative paths

  // We'll use a function to determine what kind of URL it is and format accordingly
  const urlRegex = new RegExp(
    "(" +
      // Group 1: https:// or http:// URLs
      "\\bhttps?:\\/\\/[a-zA-Z0-9_\\.\\-]+\\.[a-zA-Z0-9_\\.\\-]+[a-zA-Z0-9_\\.\\-\\/\\?=&%+#]*" +
      "|" +
      // Group 2: domain URLs without protocol
      findDomain +
      "\\/\\/[a-zA-Z0-9_\\.\\+\\-]+" +
      "|" +
      // Group 3: /file/ URLs
      "\\/file\\/[a-zA-Z0-9_\\.\\+\\-\\/]+" +
      ")\\b" +
      "|" +
      // Group 4: ./ relative paths (not word-bounded)
      "(?<=\\s|^)\\.\\/[\\w\\-\\.]+",
    "g",
  );

  processedText = processedText.replace(urlRegex, (match: string) => {
    // Case 1: https:// or http:// URLs
    if (match.startsWith("http")) {
      if (match.includes(findDomain)) {
        return `<a href="${
          match
            .replace(/https?:\/\/paperclover\.net\/+/, "/")
            .replace(/\/\/+/g, "/")
        }">${match}</a>`;
      }
      return `<a href="${
        match.replace(/\/\/+/g, "/")
      }" target="_blank" rel="noopener noreferrer">${match}</a>`;
    }

    // Case 2: domain URLs without protocol
    if (match.startsWith(findDomain)) {
      return `<a href="${
        match.replace(findDomain + "/", "/").replace(/\/\/+/g, "/")
      }">${match}</a>`;
    }

    // Case 3: /file/ URLs
    if (match.startsWith("/file/")) {
      return `<a href="${match}">${match}</a>`;
    }

    // Case 4: ./ relative paths
    if (match.startsWith("./")) {
      const filename = match.substring(2);

      // Check if the filename exists in sibling files
      const siblingFile = siblingFiles.find((f) => f.basename === filename);
      if (siblingFile) {
        return `<a href="/file/${siblingFile.path}">${match}</a>`;
      }

      // If no exact match but we have sibling files, try to create a reasonable link
      if (siblingFiles.length > 0) {
        const currentDir = siblingFiles[0].path
          .split("/")
          .slice(0, -1)
          .join("/");
        return `<a href="/file/${currentDir}/${filename}">${match}</a>`;
      }
    }

    return match;
  });

  // Match sibling file names (only if they're not already part of a link)
  if (siblingFiles.length > 0) {
    // Create a regex pattern that matches any of the sibling file basenames
    // We need to escape special regex characters in the filenames
    const escapedBasenames = siblingFiles.map((f) =>
      f.basename.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")
    );

    // Join all basenames with | for the regex alternation
    const pattern = new RegExp(`\\b(${escapedBasenames.join("|")})\\b`, "g");

    // We need to be careful not to replace text that's already in a link
    // So we'll split the text by HTML tags and only process the text parts
    const parts = processedText.split(/(<[^>]*>)/);

    for (let i = 0; i < parts.length; i += 2) {
      // Only process text parts (even indices), not HTML tags (odd indices)
      if (i < parts.length) {
        parts[i] = parts[i].replace(pattern, (match: string) => {
          const file = siblingLookup[match];
          if (file) {
            return `<a href="/file/${
              file.path.replace(/^\//, "").replace(/\/\/+/g, "/")
            }">${match}</a>`;
          }
          return match;
        });
      }
    }

    processedText = parts.join("");
  }

  return processedText;
}

export function highlightConvo(text: string) {
  text = text.replace(/^#mode=convo\n/, "");

  const lines = text.split("\n");
  const paras: { speaker: string | null; lines: string[] }[] = [];
  let currentPara: string[] = [];
  let currentSpeaker: string | null = null;
  let firstSpeaker = null;

  const speakers: Record<string, string> = {};
  const getSpeaker = (s: string) => {
    if (s[1] === " " && speakers[s[0]]) {
      return s[0];
    }
    return null;
  };

  for (const line of lines) {
    let trimmed = line.trim();
    if (line.startsWith("#")) {
      // parse #X=Y
      const [_, speaker, color] = trimmed.match(/^#(.)=(.*)$/)!;
      speakers[speaker] = color;
      continue;
    }
    if (trimmed === "") {
      continue;
    }
    let speaker = getSpeaker(trimmed);
    if (speaker) {
      trimmed = trimmed.substring(speaker.length).trimStart();
      speaker = speakers[speaker];
    } else {
      speaker = "me";
    }

    trimmed = trimmed.replace(
      /\[IMG:(\/file\/[^\]]+)\]/g,
      '<img src="$1" alt="attachment" class="convo-img" width="300" />',
    );

    if (trimmed === "---" && speaker === "me") {
      trimmed = "<hr/>";
    }

    if (speaker === currentSpeaker) {
      currentPara.push(trimmed);
    } else {
      if (currentPara.length > 0) {
        paras.push({
          speaker: currentSpeaker,
          lines: currentPara,
        });
        currentPara = [];
      }
      currentPara = [trimmed];
      currentSpeaker = speaker;
      firstSpeaker ??= speaker;
    }
  }

  if (currentPara.length > 0) {
    paras.push({
      speaker: currentSpeaker,
      lines: currentPara,
    });
  }

  return paras
    .map(({ speaker, lines }) => {
      return `<div class="s-${speaker}">${
        lines
          .map((line) => `<div class="line">${line}</div>`)
          .join("\n")
      }</div>`;
    })
    .join("\n");
}

export function highlightHashComments(text: string) {
  const lines = text.split("\n");
  return lines
    .map((line) => {
      if (line.startsWith("#")) {
        return `<div style="color: var(--primary);">${line}</div>`;
      }
      return `<div>${line.trimEnd() || "&nbsp;"}</div>`;
    })
    .join("\n");
}