/**
 *
 * Copyright 2023-2025 InspectorRAGet Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **/

'use client';

import { useState } from 'react';
import { Button, FileUploader, CodeSnippet } from '@carbon/react';
import { ArrowLeft, ArrowRight } from '@carbon/icons-react';

import { RawData } from '@/src/types';
import { camelCaseKeys } from '@/src/utilities/objects';
import { validateInputData } from '@/src/validators';
import { useNotification } from '@/src/components/notification/Notification';

import classes from './DataUploader.module.scss';

interface Props {
  onNext: Function;
  onPrev: Function;
}

export default function DataUploaderView({ onNext, onPrev }: Props) {
  const [data, setData] = useState<RawData | undefined>(undefined);

  const { createNotification } = useNotification();

  return (
    <div className={classes.root}>
      <FileUploader
        labelTitle="Upload file"
        labelDescription="Max file size is 5mb. Only .json files are supported."
        buttonLabel="Add file"
        buttonKind="primary"
        size="md"
        filenameStatus="edit"
        accept={['.json']}
        multiple={false}
        disabled={false}
        iconDescription="Delete file"
        name=""
        onChange={async (event) => {
          // Step 1: Define a filereader and configure parsing
          const fileReader = new FileReader();
          fileReader.onload = (e) => {
            if (
              e.target &&
              e.target.result &&
              typeof e.target.result === 'string'
            ) {
              // Step 1.a: Parse JSON and convert certain keys to camel case
              try {
                const fileData = camelCaseKeys(JSON.parse(e.target.result));
                // Step 1.b: Validate input data
                const status = validateInputData(fileData);

                // Step 1.c: Store data, if valid
                if (status.valid) {
                  createNotification(
                    {
                      kind: 'info',
                      title: 'Upload successful.',
                      subtitle: 'Please process to data verification step.',
                    },
                    2000,
                  );

                  setData(fileData);
                } else {
                  // Step 1.c: Generate notifications
                  status.reasons.forEach((reason) => {
                    createNotification({
                      kind: 'error',
                      title: 'Failed to upload file.',
                      subtitle: reason,
                    });
                  }, 10000);

                  // Step 1.d: Remove previously uploaded data
                  setData(undefined);
                }
              } catch (error) {
                createNotification(
                  {
                    kind: 'error',
                    title: 'Failed to upload file.',
                    subtitle:
                      "Please make sure you are uploading a valid JSON file in a 'sample.json' format.",
                  },
                  10000,
                );
                setData(undefined);
              }
            }

            return undefined;
          };

          // Step 2: Read uploaded file
          fileReader.readAsText(event.target.files[0]);
        }}
      />
      <div>
        <h4>Data format</h4>
        <CodeSnippet
          className={classes.dataFormat}
          type="multi"
          feedback="Copied to clipboard"
        >
          {`{
              "name": "Example",
              "models": [
                  {
                      "model_id": "model_a",
                      "name": "Model A",
                      "owner": "xyz@company.com"
                  },
                  {
                      "model_id": "model_b",
                      "name": "Model B",
                      "owner": "abc@company.com"
                  }
              ],
              "metrics": [
                  {
                    "name": "faithfulness",
                    "display_name": "Faithfulness",
                    "author": "human",
                    "type": "categorical",
                    "aggregator": "majority",
                    "values": [
                      {
                        "value": "no",
                        "display_value": "No",
                        "numeric_value": 1
                      },
                      {
                        "value": "mostly no",
                        "display_value": "Mostly No",
                        "numeric_value": 2
                      },
                      {
                        "value": "mostly yes",
                        "display_value": "Mostly Yes",
                        "numeric_value": 3
                      },
                      {
                        "value": "yes",
                        "display_value": "Yes",
                        "numeric_value": 4
                      }
                    ]
                  },
                  {
                    "name": "f1",
                    "display_name": "F1 (word level)",
                    "author": "algorithm",
                    "type": "numerical",
                    "range": [0,100,10]
                  },
                  {
                    "name": "comments",
                    "display_name": "Comments",
                    "author": "human",
                    "type": "text"
                  }
              ],
              "filters": ["category", "ncf_classes"],
              "documents": [
                {
                  "document_id": "document_1",
                  "text": "Document 1\nThis is a first sample document.",
                  "formatted_text": "#Document 1\nThis is a first sample document."
                },
                {
                  "document_id": "document_2",
                  "text": "Document 2\nThis is a second sample document.",
                  "formatted_text": "#Document 2\nThis is a second sample document."
                }
              ],
              "tasks": [
                {
                  "task_id": "task_1",
                  "task_type": "rag",
                  "category": "grounded",
                  "ncf_classes": ["answer"]
                  "contexts": [
                    {
                      "document_id": "document_1"
                    }
                  ],
                  "input": [{"speaker": "user", "text": "What it the document number?"}],
                  "targets": [{
                    "text": "The document number is 1."
                  }]
                },
                {
                  "task_id": "task_2",
                  "task_type": "rag",
                  "category": "random",
                  "ncf_classes": ["chit-chat"]
                  "contexts": [
                    {
                      "document_id": "document_1"
                    }
                  ],
                  "input": [{"speaker": "user", "text": "Hello"}],
                  "targets": [{
                    "text": "How can I help you?"
                  }]
                }
              ],
              "evaluations": [
                {
                  "task_id": "task_1",
                  "model_id": "model_a",
                  "model_response": "Document number is 1.",
                  "annotations": {
                    "faithfulness": {
                      "annotator_a": {
                        "timestamp": 1694615234,
                        "duration": 102,
                        "value": "yes"
                      },
                      "annotator_b": {
                        "timestamp": 1694557952,
                        "duration": 840,
                        "value": "yes"
                      },
                      "annotator_c": {
                        "timestamp": 1694551445,
                        "duration": 54,
                        "value": "mostly yes"
                      }
                    },
                    "f1": {
                      "system": {
                        "value": 82.5,
                        "duration": 0
                      }
                    }
                    "comments": {
                      "annotator_b": {
                        "timestamp": 1694615234,
                        "duration": 102,
                        "value": "Almost identical answer."
                      }
                    }
                  }
                },
                {
                  "task_id": "task_1",
                  "model_id": "model_b",
                  "model_response": "This is document number 2.",
                  "annotations": {
                    "faithfulness": {
                      "annotator_a": {
                        "timestamp": 1694615234,
                        "duration": 102,
                        "value": "no"
                      },
                      "annotator_b": {
                        "timestamp": 1694557952,
                        "duration": 840,
                        "value": "no"
                      },
                      "annotator_c": {
                        "timestamp": 1694551445,
                        "duration": 54,
                        "value": "no"
                      }
                    },
                    "f1": {
                      "system": {
                        "value": 67.12,
                        "duration": 0
                      }
                    }
                  }
                }
              ]
            }`}
        </CodeSnippet>
      </div>
      <div className={classes.navigationButtons}>
        <Button
          kind="secondary"
          renderIcon={ArrowLeft}
          iconDescription="Return to instructions"
          onClick={() => {
            onPrev(data);
          }}
        >
          Return to instructions
        </Button>
        <Button
          disabled={!data}
          renderIcon={ArrowRight}
          iconDescription="Verify data"
          onClick={() => {
            onNext(data);
          }}
        >
          Verify data
        </Button>
      </div>
    </div>
  );
}