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'use strict'

import * as vscode from 'vscode'
import { join } from 'path'
const tailwindClassNames = require('tailwind-class-names')
const dlv = require('dlv')
const Color = require('color')

const CONFIG_GLOB = '{tailwind,tailwind.config,tailwind-config,.tailwindrc}.js'

export async function activate(context: vscode.ExtensionContext) {
  let tw

  try {
    tw = await getTailwind()
  } catch (err) {}

  let intellisense = new TailwindIntellisense(tw)
  context.subscriptions.push(intellisense)

  let watcher = vscode.workspace.createFileSystemWatcher(`**/${CONFIG_GLOB}`)

  watcher.onDidChange(onFileChange)
  watcher.onDidCreate(onFileChange)
  watcher.onDidDelete(onFileChange)

  async function onFileChange(event) {
    try {
      tw = await getTailwind()
    } catch (err) {
      intellisense.dispose()
      return
    }

    intellisense.reload(tw)
  }
}

async function getTailwind() {
  if (!vscode.workspace.name) return

  let files = await vscode.workspace.findFiles(
    CONFIG_GLOB,
    '**/node_modules/**',
    1
  )
  if (!files) return null

  let configPath = files[0].fsPath

  const plugin = join(
    vscode.workspace.workspaceFolders[0].uri.fsPath,
    'node_modules',
    'tailwindcss'
  )

  let tw

  try {
    tw = await tailwindClassNames(
      configPath,
      {
        tree: true,
        strings: true
      },
      plugin
    )
  } catch (err) {
    return null
  }

  return tw
}

export function deactivate() {}

function createCompletionItemProvider(
  items,
  languages: string[],
  regex: RegExp,
  triggerCharacters: string[],
  config,
  prefix = ''
): vscode.Disposable {
  return vscode.languages.registerCompletionItemProvider(
    languages,
    {
      provideCompletionItems(
        document: vscode.TextDocument,
        position: vscode.Position
      ): vscode.CompletionItem[] {
        const range: vscode.Range = new vscode.Range(
          new vscode.Position(Math.max(position.line - 5, 0), 0),
          position
        )
        const text: string = document.getText(range)

        let p = prefix
        const separator = config.options.separator || ':'

        const matches = text.match(regex)

        if (matches) {
          const parts = matches[matches.length - 1].split(' ')
          const str = parts[parts.length - 1]

          const pth = str
            .replace(new RegExp(`${separator}`, 'g'), '.')
            .replace(/\.$/, '')
            .replace(/^\./, '')
            .replace(/\./g, '.children.')

          if (pth !== '') {
            const itms = dlv(items, pth)
            if (itms) {
              return prefixItems(itms.children, str, prefix)
            }
          }

          if (str.indexOf(separator) === -1) {
            return prefixItems(items, str, prefix)
          }

          return []
        }

        return []
      }
    },
    ...triggerCharacters
  )
}

function prefixItems(items, str, prefix) {
  const addPrefix =
    typeof prefix !== 'undefined' && prefix !== '' && str === prefix

  return Object.keys(items).map(x => {
    const item = items[x].item
    if (addPrefix) {
      item.filterText = item.insertText = `${prefix}${item.label}`
    } else {
      item.filterText = item.insertText = item.label
    }
    return item
  })
}

function depthOf(obj) {
  if (typeof obj !== 'object' || Array.isArray(obj)) return 0

  let level = 1

  for (let key in obj) {
    if (!obj.hasOwnProperty(key)) continue

    if (typeof obj[key] === 'object') {
      const depth = depthOf(obj[key]) + 1
      level = Math.max(depth, level)
    }
  }

  return level
}

function createItems(classNames, separator, config, parent = '') {
  let items = {}

  Object.keys(classNames).forEach(key => {
    if (depthOf(classNames[key]) === 0) {
      const item = new vscode.CompletionItem(
        key,
        vscode.CompletionItemKind.Constant
      )
      if (key !== 'container' && key !== 'group') {
        if (parent) {
          item.detail = classNames[key].replace(
            new RegExp(`:${parent} \{(.*?)\}`),
            '$1'
          )
        } else {
          item.detail = classNames[key]
        }

        let color = getColorFromDecl(item.detail)
        if (color) {
          item.kind = vscode.CompletionItemKind.Color
          item.documentation = color
        }
      }
      items[key] = {
        item
      }
    } else {
      const item = new vscode.CompletionItem(
        `${key}${separator}`,
        vscode.CompletionItemKind.Constant
      )
      item.command = { title: '', command: 'editor.action.triggerSuggest' }
      if (key === 'hover' || key === 'focus' || key === 'active') {
        item.detail = `:${key}`
      } else if (key === 'group-hover') {
        item.detail = '.group:hover &'
      } else if (
        config.screens &&
        Object.keys(config.screens).indexOf(key) !== -1
      ) {
        item.detail = `@media (min-width: ${config.screens[key]})`
      }
      items[key] = {
        item,
        children: createItems(classNames[key], separator, config, key)
      }
    }
  })

  return items
}

function createConfigItems(config) {
  let items = {}
  let i = 0

  Object.keys(config).forEach(key => {
    let item = new vscode.CompletionItem(
      key,
      vscode.CompletionItemKind.Constant
    )

    if (depthOf(config[key]) === 0) {
      if (key === 'plugins') return

      item.filterText = item.insertText = `.${key}`
      item.sortText = naturalExpand(i.toString())
      if (typeof config[key] === 'string' || typeof config[key] === 'number') {
        item.detail = config[key]

        let color = getColorFromValue(item.detail)
        if (color) {
          item.kind = vscode.CompletionItemKind.Color
          item.documentation = color
        }
      } else if (Array.isArray(config[key])) {
        item.detail = stringifyArray(config[key])
      }
      items[key] = { item }
    } else {
      if (key === 'modules' || key === 'options') return

      item.filterText = item.insertText = `${key}.`
      item.sortText = naturalExpand(i.toString())
      item.command = { title: '', command: 'editor.action.triggerSuggest' }
      items[key] = { item, children: createConfigItems(config[key]) }
    }

    i++
  })

  return items
}

class TailwindIntellisense {
  private _providers: vscode.Disposable[]
  private _disposable: vscode.Disposable
  private _tailwind
  private _items
  private _configItems

  constructor(tailwind) {
    if (tailwind) {
      this._tailwind = tailwind
      this.reload(tailwind)
    }
  }

  public reload(tailwind) {
    this.dispose()

    const separator = dlv(tailwind.config, 'options.separator', ':')

    if (separator !== ':') return

    this._items = createItems(tailwind.classNames, separator, tailwind.config)
    this._configItems = createConfigItems(tailwind.config)

    this._providers = []

    this._providers.push(
      createCompletionItemProvider(
        this._items,
        ['typescriptreact', 'javascript', 'javascriptreact'],
        /\btw`([^`]*)$/,
        ['`', ' ', separator],
        tailwind.config
      )
    )

    this._providers.push(
      createCompletionItemProvider(
        this._items,
        ['css', 'sass', 'scss'],
        /@apply ([^;}]*)$/,
        ['.', separator],
        tailwind.config,
        '.'
      )
    )

    this._providers.push(
      createCompletionItemProvider(
        this._items,
        [
          'html',
          'jade',
          'razor',
          'php',
          'blade',
          'vue',
          'twig',
          'markdown',
          'erb',
          'handlebars',
          'ejs',
          // for jsx
          'typescriptreact',
          'javascript',
          'javascriptreact'
        ],
        /\bclass(Name)?=["']([^"']*)$/, // /\bclass(Name)?=(["'])(?!.*?\2)/
        ["'", '"', ' ', separator],
        tailwind.config
      )
    )

    this._providers.push(
      vscode.languages.registerCompletionItemProvider(
        ['css', 'sass', 'scss'],
        {
          provideCompletionItems: (
            document: vscode.TextDocument,
            position: vscode.Position
          ): vscode.CompletionItem[] => {
            const range: vscode.Range = new vscode.Range(
              new vscode.Position(Math.max(position.line - 5, 0), 0),
              position
            )
            const text: string = document.getText(range)

            let matches = text.match(/config\(["']([^"']*)$/)

            if (!matches) return []

            let objPath =
              matches[1]
                .replace(/\.[^.]*$/, '')
                .replace('.', '.children.')
                .trim() + '.children'
            let foo = dlv(this._configItems, objPath)

            if (foo) {
              console.log(Object.keys(foo).map(x => foo[x].item))
              return Object.keys(foo).map(x => foo[x].item)
            }

            return Object.keys(this._configItems).map(
              x => this._configItems[x].item
            )
          }
        },
        "'",
        '"',
        '.'
      )
    )

    this._providers.push(
      vscode.languages.registerHoverProvider('html', {
        provideHover: (document, position, token) => {
          const range1: vscode.Range = new vscode.Range(
            new vscode.Position(Math.max(position.line - 5, 0), 0),
            position
          )
          const text1: string = document.getText(range1)

          if (!/class=['"][^'"]*$/.test(text1)) return

          const range2: vscode.Range = new vscode.Range(
            new vscode.Position(Math.max(position.line - 5, 0), 0),
            position.with({ line: position.line + 1 })
          )
          const text2: string = document.getText(range2)

          let str = text1 + text2.substr(text1.length).match(/^([^"' ]*)/)[0]
          let matches = str.match(/\bclass(Name)?=["']([^"']*)$/)

          if (matches && matches[2]) {
            let className = matches[2].split(' ').pop()
            let parts = className.split(':')

            if (typeof dlv(this._tailwind.classNames, parts) === 'string') {
              let base = parts.pop()
              let selector = `.${escapeClassName(className)}`

              if (parts.indexOf('hover') !== -1) {
                selector += ':hover'
              } else if (parts.indexOf('focus') !== -1) {
                selector += ':focus'
              } else if (parts.indexOf('active') !== -1) {
                selector += ':active'
              } else if (parts.indexOf('group-hover') !== -1) {
                selector = `.group:hover ${selector}`
              }

              let hoverStr = new vscode.MarkdownString()
              let css = this._tailwind.classNames[base]
              let m = css.match(/^(::?[a-z-]+) {(.*?)}/)
              if (m) {
                selector += m[1]
                css = m[2].trim()
              }
              css = css.replace(/([;{]) /g, '$1\n').replace(/^/gm, '  ')
              let code = `${selector} {\n${css}\n}`
              let screens = dlv(this._tailwind.config, 'screens', {})

              Object.keys(screens).some(screen => {
                if (parts.indexOf(screen) !== -1) {
                  code = `@media (min-width: ${
                    screens[screen]
                  }) {\n${code.replace(/^/gm, '  ')}\n}`
                  return true
                }
                return false
              })
              hoverStr.appendCodeblock(code, 'css')

              let hoverRange = new vscode.Range(
                new vscode.Position(
                  position.line,
                  position.character +
                    str.length -
                    text1.length -
                    className.length
                ),
                new vscode.Position(
                  position.line,
                  position.character + str.length - text1.length
                )
              )

              return new vscode.Hover(hoverStr, hoverRange)
            }
          }

          return null
        }
      })
    )

    this._disposable = vscode.Disposable.from(...this._providers)
  }

  dispose() {
    if (this._disposable) {
      this._disposable.dispose()
    }
  }
}

function pad(n) {
  return ('00000000' + n).substr(-8)
}

function naturalExpand(a: string) {
  return a.replace(/\d+/g, pad)
}

function stringifyArray(arr: Array<any>): string {
  return arr
    .reduce((acc, curr) => {
      let str = curr.toString()
      if (str.includes(' ')) {
        acc.push(`"${str.replace(/\s\s+/g, ' ')}"`)
      } else {
        acc.push(str)
      }
      return acc
    }, [])
    .join(', ')
}

function escapeClassName(className) {
  return className.replace(/([^A-Za-z0-9\-])/g, '\\$1')
}

function getColorFromDecl(cssStr: string) {
  let matches = cssStr.match(/: ([^;]+);/g)
  if (matches === null || matches.length > 1) return

  let color = matches[0].slice(2, -1).trim()

  return getColorFromValue(color)
}

function getColorFromValue(value: string) {
  if (value === 'transparent') {
    return 'rgba(0, 0, 0, 0.01)'
  }

  try {
    let parsed = Color(value)
    if (parsed.valpha === 0) return 'rgba(0, 0, 0, 0.01)'
    return parsed.rgb().string()
  } catch (err) {
    return
  }
}