import {
  CodeBlock,
  Line,
  Node,
  parse,
  Table,
} from "../scrapbox-parser/mod.ts";

export const convert = (text: string): string => {
  const blocks = parse(text, { hasTitle: false });
  return blocks.flatMap((block) => {
    switch (block.type) {
      case "title":
        return [];
      case "codeBlock":
        return convertCodeBlock(block);
      case "table":
        return convertTable(block);
      case "line":
        return convertLine(block);
    }
  })
    .map((line) => line).join("\n");
};

const convertCodeBlock = (
  { fileName, content, indent }: CodeBlock,
) => {
  const tag = " ".repeat(indent);

  return [
    `${tag}code:${fileName}`,
    ...content.split("\n").map((line) => `${tag} ${line}`),
  ];
};
const convertTable = ({ fileName, cells, indent }: Table) => {
  const tag = " ".repeat(indent);

  return [
    `${tag}table:${fileName}`,
    ...cells.map((cell) =>
      `${tag} ${
        cell.map((nodes) => nodes.map((node) => node.raw).join("")).join("\t")
      }`
    ),
  ];
};
const convertLine = ({ nodes, indent }: Line) => [
  `${" ".repeat(indent)}${
    nodes.map((node) => `${convertNode(node)}`).join(
      "",
    )
  }`,
];

const convertNode = (node: Node): string => {
  switch (node.type) {
    case "quote":
      return `> ${node.nodes.map((node) => convertNode(node)).join("")}`;
    case "helpfeel":
      return `[-? ${node.text}]`;
    case "commandLine":
      return `[-${node.symbol} ${node.text}]`;
    case "icon":
    case "strongIcon":
    case "image":
    case "strongImage":
    case "formula":
    case "code":
    case "googleMap":
      return node.raw;
    case "strong":
      return `[[${node.nodes.map((node) => convertNode(node)).join("")}]]`;
    case "decoration": {
      if (!node.decos.includes("-")) node.decos.push("-");
      const deco = node.decos.map((deco) => {
        const num = parseInt(deco.match(/\*-(\d)/)?.[1] ?? "0");
        return num > 0 ? "*".repeat(num) : deco;
      }).join("");

      return `[${deco ? `${deco} ` : ""}${
        node.nodes.map((node) => convertNode(node)).join("")
      }]`;
    }
    // linterのバグで、何故か警告が出る
    // deno-lint-ignore no-fallthrough
    case "link": {
      switch (node.pathType) {
        case "root":
        case "relative":
          return `[- [${node.href}]]`;
        case "absolute":
          return `[- ${node.content ? `${node.content} ` : ""}${node.href}]]`;
      }
    }
    case "hashTag":
      return `[- #${node.href}]`;
    case "numberList":
      return `${node.number}. ${node.nodes.map((node) => convertNode(node)).join("")}`;
    case "blank":
    case "plain":
      return `[- ${node.text}]`;
  }
};