import React, { useState, useEffect } from "react";

import AceEditor from "react-ace";
import "ace-builds/src-noconflict/theme-github";
import "ace-builds/src-noconflict/ext-language_tools";

import "ace-builds/webpack-resolver";
import "ace-builds/src-noconflict/mode-yaml";

import jsYaml from "js-yaml";

import Ajv from "ajv";
const ajv = new Ajv({ allErrors: true });

import Schema from "../../../static/schema/schema.v2.json";

const validate = ajv.compile(Schema.definitions.schema);
const initialValue = `# yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json
language: "en-US"
early_access: false
reviews:
  profile: "chill"
  request_changes_workflow: false
  high_level_summary: true
  poem: true
  review_status: true
  collapse_walkthrough: false
  auto_review:
    enabled: true
    drafts: false
chat:
  auto_reply: true
`;
export default function YamlEditor() {
  const [value, setValue] = useState(initialValue);
  const [annotations, setAnnotations] = useState([]);

  useEffect(() => {
    setValue(initialValue);
    validateAndSetAnnotations(initialValue);
  }, []);

  function validateAndSetAnnotations(yaml) {
    try {
      const doc = jsYaml.load(yaml, { strict: true });
      const isValid = validate(doc);

      if (!isValid && validate.errors) {
        setAnnotations(
          validate.errors.map((err) => {
            const instancePathArr = err?.instancePath?.split("/");
            const key =
              instancePathArr && instancePathArr[instancePathArr.length - 1];
            return {
              row: err.instancePath ? getLineNumber(yaml, err.instancePath) : 0,
              column: 0,
              text: `${key}: ${err.message} ${
                err?.params?.allowedValues
                  ? `Allowed values: ${err.params.allowedValues.join(", ")}`
                  : ""
              }`,
              type: "error",
            };
          })
        );
      } else {
        setAnnotations([]);
      }
    } catch (err) {
      const instancePathArr = err?.instancePath?.split("/");
      const key =
        instancePathArr && instancePathArr[instancePathArr.length - 1];

      setAnnotations([
        {
          row: err.instancePath ? getLineNumber(yaml, err.instancePath) : 0,
          column: 0,
          text:
            `${key}: ${err.message} ${
              err?.params?.allowedValues
                ? `Allowed values: ${err.params.allowedValues.join(", ")}`
                : ""
            }` || "YAML parsing error",
          type: "error",
        },
      ]);
    }
  }

  function getLineNumber(yaml, instancePath) {
    const lines = yaml.split("\n");
    const pathParts = instancePath.split("/").filter(Boolean);
    let currentObj = jsYaml.load(yaml);
    let lineNumber = 0;

    const lastPathPart = pathParts[pathParts.length - 1];
    const lastPathPartIndex = pathParts.length - 1;

    for (let i = 0; i < lines.length; i++) {
      if (lines[i].trim().startsWith(pathParts[0] + ":")) {
        // Found the top-level field
        lineNumber = i;
        currentObj = currentObj[pathParts[0]];

        for (let j = 1; j < lastPathPartIndex; j++) {
          // Go through the nested fields
          for (let k = lineNumber + 1; k < lines.length; k++) {
            if (lines[k].trim().startsWith(pathParts[j] + ":")) {
              lineNumber = k;
              currentObj = currentObj[pathParts[j]];
              break;
            }
          }
        }

        // look for the last path part with array syntax as well as object syntax
        for (let l = lineNumber + 1; l < lines.length; l++) {
          if (lines[l].trim().startsWith(`- ${lastPathPart}:`)) {
            lineNumber = l;
            break;
          } else if (lines[l].trim().startsWith(lastPathPart + ":")) {
            lineNumber = l;
            break;
          }
        }
        break;
      }
    }

    return lineNumber;
  }
  
  function onChange(newValue) {
    setValue(newValue);
    validateAndSetAnnotations(newValue);
  }

  return (
    <div className="m4">
      <AceEditor
        mode="yaml"
        theme="github"
        onChange={onChange}
        value={value}
        name="yaml-editor"
        editorProps={{ $blockScrolling: true }}
        setOptions={{
          useWorker: false,
          showPrintMargin: false,
          showGutter: true,
        }}
        annotations={annotations}
        width="100%"
        height="400px"
      />
      <br />
    </div>
  );
}