import 'package:highlight/highlight.dart';

final markdown = Mode(
    refs: {},
    aliases: [
      "md",
      "mkdown",
      "mkd"
    ],
    contains: [
      // Headers (with distinct classes for each level)
      Mode(
          className: "header",
          variants: [
            // Level 1 header (#)
            Mode(
                className: "header-h1",
                begin: "^#\\s+",
                end: "\$"
            ),
            // Level 2 header (##)
            Mode(
                className: "header-h2",
                begin: "^##\\s+",
                end: "\$"
            ),
            // Level 3 header (###)
            Mode(
                className: "header-h3",
                begin: "^###\\s+",
                end: "\$"
            ),
            // Level 4 header (####)
            Mode(
                className: "header-h4",
                begin: "^####\\s+",
                end: "\$"
            ),
            // Level 5 header (#####)
            Mode(
                className: "header-h5",
                begin: "^#####\\s+",
                end: "\$"
            ),
            // Level 6 header (######)
            Mode(
                className: "header-h6",
                begin: "^######\\s+",
                end: "\$"
            ),
            // Underlined headers (=== and ---)
            Mode(
                className: "header-underline",
                begin: "^.+?\\n[=-]{2,}\$"
            )
          ]
      ),

      // HTML tags
      Mode(
          begin: "<",
          end: ">",
          subLanguage: ["xml"],
          relevance: 0
      ),

      // Lists
      Mode(
          className: "list",
          begin: "^\\s*([*+-]|(\\d+\\.))\\s+"
      ),

      // Bold text
      Mode(
          className: "bold",
          begin: "[*_]{2}.+?[*_]{2}"
      ),

      // Italic text
      Mode(
          className: "italic",
          variants: [
            Mode(begin: "\\*.+?\\*"),
            Mode(begin: "_.+?_", relevance: 0)
          ]
      ),

      // Blockquotes
      Mode(
          className: "blockquote",
          begin: "^>\\s+",
          end: "\$"
      ),

      // Code blocks and inline code
      Mode(
          className: "code",
          variants: [
            Mode(begin: "^```\\w*\\s*\$", end: "^```[ ]*\$"), // Fenced code blocks
            Mode(begin: "`.+?`"), // Inline code
            Mode(begin: "^( {4}|\\t)", end: "\$", relevance: 0) // Indented code blocks
          ]
      ),

      // Horizontal rules
      Mode(
          className: "horizontal-rule",
          begin: "^[-\\*]{3,}",
          end: "\$"
      ),

      // Links and images
      Mode(
          begin: "\\[.+?\\][\\(\\[].*?[\\)\\]]",
          returnBegin: true,
          contains: [
            Mode(
                className: "link-text",
                begin: "\\[",
                end: "\\]",
                excludeBegin: true,
                returnEnd: true,
                relevance: 0
            ),
            Mode(
                className: "link-url",
                begin: "\\]\\(",
                end: "\\)",
                excludeBegin: true,
                excludeEnd: true
            ),
            Mode(
                className: "link-reference",
                begin: "\\]\\[",
                end: "\\]",
                excludeBegin: true,
                excludeEnd: true
            )
          ],
          relevance: 10
      ),

      // Reference-style links
      Mode(
          begin: "^\\[[^\\n]+\\]:",
          returnBegin: true,
          contains: [
            Mode(
                className: "link-reference",
                begin: "\\[",
                end: "\\]",
                excludeBegin: true,
                excludeEnd: true
            ),
            Mode(
                className: "link-url",
                begin: ":\\s*",
                end: "\$",
                excludeBegin: true
            )
          ]
      ),

      // Strikethrough text
      Mode(
          className: "strikethrough",
          begin: "~~.+?~~"
      ),

      // Tables
      Mode(
          className: "table",
          begin: "^\\|.+?\\|",
          end: "\$",
          contains: [
            Mode(
                className: "table-header",
                begin: "^\\|",
                end: "\\|",
                contains: [
                  Mode(
                      className: "table-cell",
                      begin: "[^|]+",
                      end: "\$"
                  )
                ]
            ),
            Mode(
                className: "table-row",
                begin: "^\\|",
                end: "\\|",
                contains: [
                  Mode(
                      className: "table-cell",
                      begin: "[^|]+",
                      end: "\$"
                  )
                ]
            )
          ]
      ),

      // Task lists
      Mode(
          className: "task-list",
          begin: "^\\s*-\\s*\\[\\s*[xX ]?\\s*\\]\\s+"
      ),

  Mode(
      className: "link-reference",
      begin: "\\[",
      end: "\\]",
      excludeBegin: true,
      excludeEnd: true
  ),

  // Custom Tag Highlighting
  Mode(
      className: "tag-hash",
      begin: "(?<=\\s|^)#[a-zA-Z0-9_]+",
      relevance: 10), // Magenta
  Mode(
      className: "tag-plus",
      begin: "(?<=\\s|^)\\+[a-zA-Z0-9_]+",
      relevance: 10), // Cyan
  Mode(
      className: "tag-at",
      begin: "(?<=\\s|^)@[a-zA-Z0-9_]+",
      relevance: 10), // Yellow
  Mode(
      className: "command",
      begin: "(?<=\\s|^):[a-zA-Z0-9_]+",
      relevance: 10),
  Mode(
      className: "link-url",
      begin: "(?<=\\s|^)/[a-zA-Z0-9_/]+",
      relevance: 10), // Yellow
]);