import * as random from 'lib0/random'
import * as Ast from 'shared/ast'
import {
  Builder,
  EnsoUUID,
  OutboundMessage,
  OutboundPayload,
  VisualizationContext,
  VisualizationUpdate,
} from 'shared/binaryProtocol'
import { mockDataWSHandler as originalMockDataWSHandler } from 'shared/dataServer/mock'
import type {
  ContextId,
  ExpressionId,
  LibraryComponentGroup,
  Path,
  Uuid,
  VisualizationConfiguration,
  response,
} from 'shared/languageServerTypes'
import type { SuggestionEntry } from 'shared/languageServerTypes/suggestions'
import { uuidToBits } from 'shared/uuid'
import type { MockTransportData, WebSocketHandler } from 'src/util/net'
import type { QualifiedName } from 'src/util/qualifiedName'
import { mockFsDirectoryHandle, type FileTree } from '../src/util/convert/fsAccess'
import mockDb from '../stories/mockSuggestions.json' assert { type: 'json' }

const mockProjectId = random.uuidv4() as Uuid
const standardBase = 'Standard.Base' as QualifiedName

export function placeholderGroups(): LibraryComponentGroup[] {
  return [
    { color: '#4D9A29', name: 'Input', library: standardBase, exports: [] },
    { color: '#B37923', name: 'Web', library: standardBase, exports: [] },
    { color: '#9735B9', name: 'Parse', library: standardBase, exports: [] },
    { color: '#4D9A29', name: 'Select', library: standardBase, exports: [] },
    { color: '#B37923', name: 'Join', library: standardBase, exports: [] },
    { color: '#9735B9', name: 'Transform', library: standardBase, exports: [] },
    { color: '#4D9A29', name: 'Output', library: standardBase, exports: [] },
  ]
}

let mainFile = `\
from Standard.Base import all

func1 arg =
    f2 = Main.func2 arg
    result = f2 - 5
    result

func2 a =
    r = 42 + a
    r

main =
    five = 5
    ten = 10
    sum = five + ten
    prod = sum * 3
    ## This node can be entered
    final = Main.func1 prod
    list = []
    text = 'test'
    
    # Widget tests
    data = Data.read
    filtered = data.filter
    aggregated = data.aggregate
`

export function getMainFile() {
  return mainFile
}

export function setMainFile(newMainFile: string) {
  return (mainFile = newMainFile)
}

const fileTree = {
  src: {
    get 'Main.enso'() {
      return mainFile
    },
  },
}

const visualizations = new Map<Uuid, VisualizationConfiguration>()
const visualizationExprIds = new Map<Uuid, ExpressionId>()

const encoder = new TextEncoder()
const encodeJSON = (data: unknown) => encoder.encode(JSON.stringify(data))

const scatterplotJson = encodeJSON({
  axis: {
    x: { label: 'x-axis label', scale: 'linear' },
    y: { label: 'y-axis label', scale: 'logarithmic' },
  },
  points: { labels: 'visible' },
  data: [
    { x: 0.1, y: 0.7, label: 'foo', color: '#FF0000', shape: 'circle', size: 0.2 },
    { x: 0.4, y: 0.2, label: 'baz', color: '#0000FF', shape: 'square', size: 0.3 },
  ],
})

const mockVizData: Record<string, Uint8Array | ((params: string[]) => Uint8Array)> = {
  // JSON
  'Standard.Visualization.Preprocessor.default_preprocessor': scatterplotJson,
  'Standard.Visualization.Scatter_Plot.process_to_json_text': scatterplotJson,
  'Standard.Visualization.SQL.Visualization.prepare_visualization': encodeJSON({
    dialect: 'sql',
    code: `SELECT * FROM \`foo\` WHERE \`a\` = ? AND b LIKE ?;`,
    interpolations: [
      // eslint-disable-next-line camelcase
      { enso_type: 'Data.Numbers.Number', value: '123' },
      // eslint-disable-next-line camelcase
      { enso_type: 'Builtins.Main.Text', value: "a'bcd" },
    ],
  }),
  'Standard.Visualization.Geo_Map.process_to_json_text': encodeJSON({
    latitude: 37.8,
    longitude: -122.45,
    zoom: 15,
    controller: true,
    showingLabels: true, // Enables presenting labels when hovering over a point.
    layers: [
      {
        type: 'Scatterplot_Layer',
        data: [
          {
            latitude: 37.8,
            longitude: -122.45,
            color: [255, 0, 0],
            radius: 100,
            label: 'an example label',
          },
        ],
      },
    ],
  }),
  'Standard.Visualization.Histogram.process_to_json_text': encodeJSON({
    axis: {
      x: { label: 'x-axis label', scale: 'linear' },
      y: { label: 'y-axis label', scale: 'logarithmic' },
    },
    color: 'rgb(1.0,0.0,0.0)',
    bins: 10,
    data: {
      values: [0.1, 0.2, 0.1, 0.15, 0.7],
    },
  }),
  'Standard.Visualization.Table.Visualization.prepare_visualization': encodeJSON({
    type: 'Matrix',
    // eslint-disable-next-line camelcase
    column_count: 5,
    // eslint-disable-next-line camelcase
    all_rows_count: 10,
    json: Array.from({ length: 10 }, (_, i) => Array.from({ length: 5 }, (_, j) => `${i},${j}`)),
  }),
  'Standard.Visualization.Warnings.process_to_json_text': encodeJSON([
    'warning 1',
    "warning 2!!&<>;'\x22",
  ]),
  'Standard.Visualization.Widgets.get_widget_json': (params) => {
    switch (params[0]) {
      case '.read':
        return encodeJSON([
          [
            'path',
            {
              type: 'Widget',
              constructor: 'Single_Choice',
              label: null,
              values: [
                {
                  type: 'Choice',
                  constructor: 'Option',
                  value: '"File 1"',
                  label: 'File 1',
                  parameters: [],
                },
                {
                  type: 'Choice',
                  constructor: 'Option',
                  value: '"File 2"',
                  label: 'File 2',
                  parameters: [],
                },
              ],
              display: { type: 'Display', constructor: 'Always' },
            },
          ],
        ])
      case '.aggregate':
        return encodeJSON([
          [
            'columns',
            {
              type: 'Widget',
              constructor: 'Vector_Editor',
              /* eslint-disable camelcase */
              item_default: 'Aggregate_Column.Group_By',
              item_editor: {
                type: 'Widget',
                constructor: 'Single_Choice',
                label: null,
                values: [
                  {
                    type: 'Choice',
                    constructor: 'Option',
                    value: 'Standard.Table.Data.Aggregate_Column.Aggregate_Column.Group_By',
                    label: null,
                    parameters: [
                      [
                        'column',
                        {
                          type: 'Widget',
                          constructor: 'Single_Choice',
                          label: null,
                          values: [
                            {
                              type: 'Choice',
                              constructor: 'Option',
                              value: '"column 1"',
                              label: 'column 1',
                              parameters: [],
                            },
                            {
                              type: 'Choice',
                              constructor: 'Option',
                              value: '"column 2"',
                              label: 'column 2',
                              parameters: [],
                            },
                          ],
                          display: { type: 'Display', constructor: 'Always' },
                        },
                      ],
                    ],
                  },
                  {
                    type: 'Choice',
                    constructor: 'Option',
                    value: 'Standard.Table.Data.Aggregate_Column.Aggregate_Column.Count',
                    label: null,
                    parameters: [],
                  },
                  {
                    type: 'Choice',
                    constructor: 'Option',
                    value: 'Standard.Table.Data.Aggregate_Column.Aggregate_Column.Count_Distinct',
                    label: null,
                    parameters: [
                      [
                        'columns',
                        {
                          type: 'Widget',
                          constructor: 'Single_Choice',
                          label: null,
                          values: [
                            {
                              type: 'Choice',
                              constructor: 'Option',
                              value: '"column 1"',
                              label: 'column 1',
                              parameters: [],
                            },
                            {
                              type: 'Choice',
                              constructor: 'Option',
                              value: '"column 2"',
                              label: 'column 2',
                              parameters: [],
                            },
                          ],
                          display: { type: 'Display', constructor: 'Always' },
                        },
                      ],
                    ],
                  },
                ],
                display: { type: 'Display', constructor: 'Always' },
              },
              /* eslint-enable camelcase */
              display: { type: 'Display', constructor: 'Always' },
            },
          ],
        ])
      default:
        return encodeJSON([])
    }
  },
  // The following visualizations do not have unique transformation methods, and as such are only kept
  // for posterity.
  Image: encodeJSON({
    mediaType: 'image/svg+xml',
    base64: `PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIgaGVpZ2h0PSI0\
MCI+PGcgY2xpcC1wYXRoPSJ1cmwoI2EpIj48cGF0aCBkPSJNMjAuMDUgMEEyMCAyMCAwIDAgMCAwIDIwLjA1IDIwLjA2IDIwLjA\
2IDAgMSAwIDIwLjA1IDBabTAgMzYuMDVjLTguOTMgMC0xNi4xLTcuMTctMTYuMS0xNi4xIDAtOC45NCA3LjE3LTE2LjEgMTYuMS\
0xNi4xIDguOTQgMCAxNi4xIDcuMTYgMTYuMSAxNi4xYTE2LjE4IDE2LjE4IDAgMCAxLTE2LjEgMTYuMVoiLz48cGF0aCBkPSJNM\
jcuMTIgMTcuNzdhNC42OCA0LjY4IDAgMCAxIDIuMzkgNS45MiAxMC4yMiAxMC4yMiAwIDAgMS05LjU2IDYuODZBMTAuMiAxMC4y\
IDAgMCAxIDkuNzcgMjAuMzZzMS41NSAyLjA4IDQuNTcgMi4wOGMzLjAxIDAgNC4zNi0xLjE0IDUuNi0yLjA4IDEuMjUtLjkzIDI\
uMDktMyA1LjItMyAuNzMgMCAxLjQ2LjIgMS45OC40WiIvPjwvZz48ZGVmcz48Y2xpcFBhdGggaWQ9ImEiPjxwYXRoIGZpbGw9Ii\
NmZmYiIGQ9Ik0wIDBoNDB2NDBIMHoiLz48L2NsaXBQYXRoPjwvZGVmcz48L3N2Zz4=`,
  }),
  Heatmap: encodeJSON([
    ['A', 'B', 'C', 'D', 'A'],
    ['D', 'E', 'D', 'X', 'Z'],
    [50, 25, 40, 20, 10],
  ]),
}

function createMessageId(builder: Builder) {
  const messageUuid = random.uuidv4()
  const [leastSigBits, mostSigBits] = uuidToBits(messageUuid)
  return EnsoUUID.createEnsoUUID(builder, leastSigBits, mostSigBits)
}

function createId(id: Uuid) {
  const [low, high] = uuidToBits(id)
  return (builder: Builder) => EnsoUUID.createEnsoUUID(builder, low, high)
}

function sendVizData(id: Uuid, config: VisualizationConfiguration) {
  const vizDataHandler =
    mockVizData[
      typeof config.expression === 'string' ?
        `${config.visualizationModule}.${config.expression}`
      : `${config.expression.definedOnType}.${config.expression.name}`
    ]
  if (!vizDataHandler || !sendData) return
  const vizData =
    vizDataHandler instanceof Uint8Array ? vizDataHandler : (
      vizDataHandler(config.positionalArgumentsExpressions ?? [])
    )
  const builder = new Builder()
  const exprId = visualizationExprIds.get(id)
  const visualizationContextOffset = VisualizationContext.createVisualizationContext(
    builder,
    createId(id),
    createId(config.executionContextId),
    exprId ? createId(exprId) : null,
  )
  const dataOffset = VisualizationUpdate.createDataVector(builder, vizData)
  const payload = VisualizationUpdate.createVisualizationUpdate(
    builder,
    visualizationContextOffset,
    dataOffset,
  )
  const rootTable = OutboundMessage.createOutboundMessage(
    builder,
    createMessageId,
    null, // correlationId
    OutboundPayload.VISUALIZATION_UPDATE,
    payload,
  )
  sendData(builder.finish(rootTable).toArrayBuffer())
}

let sendData: ((data: string | Blob | ArrayBufferLike | ArrayBufferView) => void) | undefined

export const mockLSHandler: MockTransportData = async (method, data, transport) => {
  switch (method) {
    case 'session/initProtocolConnection':
      return {
        contentRoots: [{ type: 'Project', id: mockProjectId }],
      } satisfies response.InitProtocolConnection
    case 'executionContext/create': {
      const data_ = data as {
        contextId: ContextId
      }
      setTimeout(
        () => transport.emit('executionContext/executionComplete', { contextId: data_.contextId }),
        100,
      )
      return {
        contextId: data_.contextId,
      }
    }
    case 'executionContext/attachVisualization': {
      const data_ = data as {
        visualizationId: Uuid
        expressionId: ExpressionId
        visualizationConfig: VisualizationConfiguration
      }
      visualizations.set(data_.visualizationId, data_.visualizationConfig)
      visualizationExprIds.set(data_.visualizationId, data_.expressionId)
      sendVizData(data_.visualizationId, data_.visualizationConfig)
      return
    }
    case 'executionContext/detachVisualization': {
      const data_ = data as {
        visualizationId: Uuid
        expressionId: ExpressionId
        contextId: ContextId
      }
      visualizations.delete(data_.visualizationId)
      visualizationExprIds.delete(data_.visualizationId)
      return
    }
    case 'executionContext/modifyVisualization': {
      const data_ = data as {
        visualizationId: Uuid
        visualizationConfig: VisualizationConfiguration
      }
      visualizations.set(data_.visualizationId, data_.visualizationConfig)
      sendVizData(data_.visualizationId, data_.visualizationConfig)
      return
    }
    case 'executionContext/executeExpression': {
      const data_ = data as {
        executionContextId: ContextId
        visualizationId: Uuid
        expressionId: ExpressionId
        expression: string
      }
      const { func, args } = Ast.analyzeAppLike(Ast.parse(data_.expression))
      if (!(func instanceof Ast.PropertyAccess && func.lhs)) return
      const visualizationConfig: VisualizationConfiguration = {
        executionContextId: data_.executionContextId,
        visualizationModule: func.lhs.code(),
        expression: func.rhs.code(),
        positionalArgumentsExpressions: args.map((ast) => ast.code()),
      }
      visualizationExprIds.set(data_.visualizationId, data_.expressionId)
      sendVizData(data_.visualizationId, visualizationConfig)
      return
    }
    case 'search/getSuggestionsDatabase':
      return {
        entries: mockDb.map((suggestion, id) => ({
          id,
          suggestion: suggestion as SuggestionEntry,
        })),
        currentVersion: 1,
      } satisfies response.GetSuggestionsDatabase
    case 'runtime/getComponentGroups':
      return { componentGroups: placeholderGroups() } satisfies response.GetComponentGroups
    case 'executionContext/push':
    case 'executionContext/pop':
    case 'executionContext/recompute':
    case 'capability/acquire':
      return {}
    case 'file/list': {
      const data_ = data as { path: Path }
      if (!data_.path) return Promise.reject(`'path' parameter missing in '${method}'`)
      if (data_.path.rootId !== mockProjectId)
        return Promise.reject(
          `Only the project's 'rootId' is supported, got '${data_.path.rootId}'`,
        )
      let child: FileTree | string | ArrayBuffer | undefined = fileTree
      if (child) {
        for (const segment of data_.path.segments) {
          child = child?.[segment]
          if (!child || typeof child === 'string' || child instanceof ArrayBuffer) break
        }
      }
      if (!child) return Promise.reject(`Folder '/${data_.path.segments.join('/')}' not found.`)
      if (typeof child === 'string' || child instanceof ArrayBuffer)
        return Promise.reject(`File '/${data_.path.segments.join('/')}' is not a folder.`)
      return {
        paths: Object.entries(child).map(([name, entry]) => ({
          type: typeof entry === 'string' || entry instanceof ArrayBuffer ? 'File' : 'Directory',
          name,
          path: { rootId: data_.path.rootId, segments: [...data_.path.segments, name] },
        })),
      } satisfies response.FileList
    }
    default:
      return Promise.reject(`Method '${method}' not mocked`)
  }
}

const directory = mockFsDirectoryHandle(fileTree, '(root)')

export const mockDataHandler: WebSocketHandler = originalMockDataWSHandler(
  async (segments) => {
    if (!segments.length) return
    let file
    try {
      let dir = directory
      for (const segment of segments.slice(0, -1)) {
        dir = await dir.getDirectoryHandle(segment)
      }
      const fileHandle = await dir.getFileHandle(segments.at(-1)!)
      file = await fileHandle.getFile()
    } catch {
      return
    }
    return await file?.arrayBuffer()
  },
  (send) => (sendData = send),
)