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import {
  CodeAction,
  CodeActionParams,
  CodeActionKind,
  TextEdit,
  Range,
} from 'vscode-languageserver'
import { State } from '../../util/state'
import { InvalidApplyDiagnostic } from '../diagnostics/types'
import { getClassNameParts } from '../../util/getClassNameAtPosition'
import { getLanguageBoundaries } from '../../util/getLanguageBoundaries'
import { isCssDoc } from '../../util/css'
import { isWithinRange } from '../../util/isWithinRange'
const dlv = require('dlv')
import type { Root, NodeSource } from 'postcss'
import { absoluteRange } from '../../util/absoluteRange'
import { removeRangesFromString } from '../../util/removeRangesFromString'
import detectIndent from 'detect-indent'
import isObject from '../../../util/isObject'
import { cssObjToAst } from '../../util/cssObjToAst'
import dset from 'dset'

export async function provideInvalidApplyCodeActions(
  state: State,
  params: CodeActionParams,
  diagnostic: InvalidApplyDiagnostic
): Promise<CodeAction[]> {
  let document = state.editor.documents.get(params.textDocument.uri)
  let documentText = document.getText()
  let cssRange: Range
  let cssText = documentText
  const { postcss } = state.modules
  let changes: TextEdit[] = []

  let totalClassNamesInClassList = diagnostic.className.classList.classList.split(
    /\s+/
  ).length

  let className = diagnostic.className.className
  let classNameParts = getClassNameParts(state, className)
  let classNameInfo = dlv(state.classNames.classNames, classNameParts)

  if (Array.isArray(classNameInfo)) {
    return []
  }

  if (!isCssDoc(state, document)) {
    let languageBoundaries = getLanguageBoundaries(state, document)
    if (!languageBoundaries) return []
    cssRange = languageBoundaries.css.find((range) =>
      isWithinRange(diagnostic.range.start, range)
    )
    if (!cssRange) return []
    cssText = document.getText(cssRange)
  }

  try {
    await postcss([
      postcss.plugin('', (_options = {}) => {
        return (root: Root) => {
          root.walkRules((rule) => {
            if (changes.length) return false

            rule.walkAtRules('apply', (atRule) => {
              let atRuleRange = postcssSourceToRange(atRule.source)
              if (cssRange) {
                atRuleRange = absoluteRange(atRuleRange, cssRange)
              }

              if (!isWithinRange(diagnostic.range.start, atRuleRange))
                return true

              let ast = classNameToAst(
                state,
                classNameParts,
                rule.selector,
                diagnostic.className.classList.important
              )

              if (!ast) return false

              rule.after(ast.nodes)
              let insertedRule = rule.next()
              if (!insertedRule) return false

              if (totalClassNamesInClassList === 1) {
                atRule.remove()
              } else {
                changes.push({
                  range: diagnostic.className.classList.range,
                  newText: removeRangesFromString(
                    diagnostic.className.classList.classList,
                    diagnostic.className.relativeRange
                  ),
                })
              }

              let ruleRange = postcssSourceToRange(rule.source)
              if (cssRange) {
                ruleRange = absoluteRange(ruleRange, cssRange)
              }

              let outputIndent: string
              let documentIndent = detectIndent(documentText)

              changes.push({
                range: ruleRange,
                newText:
                  rule.toString() +
                  (insertedRule.raws.before || '\n\n') +
                  insertedRule
                    .toString()
                    .replace(/\n\s*\n/g, '\n')
                    .replace(/(@apply [^;\n]+)$/gm, '$1;')
                    .replace(/([^\s^]){$/gm, '$1 {')
                    .replace(/^\s+/gm, (m: string) => {
                      if (typeof outputIndent === 'undefined') outputIndent = m
                      return m.replace(
                        new RegExp(outputIndent, 'g'),
                        documentIndent.indent
                      )
                    }),
              })

              return false
            })
          })
        }
      }),
    ]).process(cssText, { from: undefined })
  } catch (_) {
    return []
  }

  if (!changes.length) {
    return []
  }

  return [
    {
      title: 'Extract to new rule',
      kind: CodeActionKind.QuickFix,
      diagnostics: [diagnostic],
      edit: {
        changes: {
          [params.textDocument.uri]: changes,
        },
      },
    },
  ]
}

function postcssSourceToRange(source: NodeSource): Range {
  return {
    start: {
      line: source.start.line - 1,
      character: source.start.column - 1,
    },
    end: {
      line: source.end.line - 1,
      character: source.end.column,
    },
  }
}

function classNameToAst(
  state: State,
  classNameParts: string[],
  selector: string,
  important: boolean = false
) {
  const baseClassName = dlv(
    state.classNames.classNames,
    classNameParts[classNameParts.length - 1]
  )
  if (!baseClassName) {
    return null
  }
  const info = dlv(state.classNames.classNames, classNameParts)
  let context = info.__context || []
  let pseudo = info.__pseudo || []
  const globalContexts = state.classNames.context
  let screens = dlv(
    state.config,
    'theme.screens',
    dlv(state.config, 'screens', {})
  )
  if (!isObject(screens)) screens = {}
  screens = Object.keys(screens)
  const path = []

  for (let i = 0; i < classNameParts.length - 1; i++) {
    let part = classNameParts[i]
    let common = globalContexts[part]
    if (!common) return null
    if (screens.includes(part)) {
      path.push(`@screen ${part}`)
      context = context.filter((con) => !common.includes(con))
    }
  }

  path.push(...context)

  let obj = {}
  for (let i = 1; i <= path.length; i++) {
    dset(obj, path.slice(0, i), {})
  }
  let rule = {
    // TODO: use proper selector parser
    [selector + pseudo.join('')]: {
      [`@apply ${classNameParts[classNameParts.length - 1]}${
        important ? ' !important' : ''
      }`]: '',
    },
  }
  if (path.length) {
    dset(obj, path, rule)
  } else {
    obj = rule
  }

  return cssObjToAst(obj, state.modules.postcss)
}