'use strict'

let { SourceMapConsumer, SourceMapGenerator } = require('source-map-js')
let { fileURLToPath, pathToFileURL } = require('url')
let { isAbsolute, resolve } = require('path')
let { nanoid } = require('nanoid/non-secure')

let terminalHighlight = require('./terminal-highlight')
let CssSyntaxError = require('./css-syntax-error')
let PreviousMap = require('./previous-map')

let fromOffsetCache = Symbol('fromOffsetCache')

let sourceMapAvailable = Boolean(SourceMapConsumer && SourceMapGenerator)
let pathAvailable = Boolean(resolve && isAbsolute)

class Input {
  constructor(css, opts = {}) {
    if (
      css === null ||
      typeof css === 'undefined' ||
      (typeof css === 'object' && !css.toString)
    ) {
      throw new Error(`PostCSS received ${css} instead of CSS string`)
    }

    this.css = css.toString()

    if (this.css[0] === '\uFEFF' || this.css[0] === '\uFFFE') {
      this.hasBOM = true
      this.css = this.css.slice(1)
    } else {
      this.hasBOM = false
    }

    if (opts.from) {
      if (
        !pathAvailable ||
        /^\w+:\/\//.test(opts.from) ||
        isAbsolute(opts.from)
      ) {
        this.file = opts.from
      } else {
        this.file = resolve(opts.from)
      }
    }

    if (pathAvailable && sourceMapAvailable) {
      let map = new PreviousMap(this.css, opts)
      if (map.text) {
        this.map = map
        let file = map.consumer().file
        if (!this.file && file) this.file = this.mapResolve(file)
      }
    }

    if (!this.file) {
      this.id = '<input css ' + nanoid(6) + '>'
    }
    if (this.map) this.map.file = this.from
  }

  error(message, line, column, opts = {}) {
    let result, endLine, endColumn

    if (line && typeof line === 'object') {
      let start = line
      let end = column
      if (typeof start.offset === 'number') {
        let pos = this.fromOffset(start.offset)
        line = pos.line
        column = pos.col
      } else {
        line = start.line
        column = start.column
      }
      if (typeof end.offset === 'number') {
        let pos = this.fromOffset(end.offset)
        endLine = pos.line
        endColumn = pos.col
      } else {
        endLine = end.line
        endColumn = end.column
      }
    } else if (!column) {
      let pos = this.fromOffset(line)
      line = pos.line
      column = pos.col
    }

    let origin = this.origin(line, column, endLine, endColumn)
    if (origin) {
      result = new CssSyntaxError(
        message,
        origin.endLine === undefined
          ? origin.line
          : { column: origin.column, line: origin.line },
        origin.endLine === undefined
          ? origin.column
          : { column: origin.endColumn, line: origin.endLine },
        origin.source,
        origin.file,
        opts.plugin
      )
    } else {
      result = new CssSyntaxError(
        message,
        endLine === undefined ? line : { column, line },
        endLine === undefined ? column : { column: endColumn, line: endLine },
        this.css,
        this.file,
        opts.plugin
      )
    }

    result.input = { column, endColumn, endLine, line, source: this.css }
    if (this.file) {
      if (pathToFileURL) {
        result.input.url = pathToFileURL(this.file).toString()
      }
      result.input.file = this.file
    }

    return result
  }

  fromOffset(offset) {
    let lastLine, lineToIndex
    if (!this[fromOffsetCache]) {
      let lines = this.css.split('\n')
      lineToIndex = new Array(lines.length)
      let prevIndex = 0

      for (let i = 0, l = lines.length; i < l; i++) {
        lineToIndex[i] = prevIndex
        prevIndex += lines[i].length + 1
      }

      this[fromOffsetCache] = lineToIndex
    } else {
      lineToIndex = this[fromOffsetCache]
    }
    lastLine = lineToIndex[lineToIndex.length - 1]

    let min = 0
    if (offset >= lastLine) {
      min = lineToIndex.length - 1
    } else {
      let max = lineToIndex.length - 2
      let mid
      while (min < max) {
        mid = min + ((max - min) >> 1)
        if (offset < lineToIndex[mid]) {
          max = mid - 1
        } else if (offset >= lineToIndex[mid + 1]) {
          min = mid + 1
        } else {
          min = mid
          break
        }
      }
    }
    return {
      col: offset - lineToIndex[min] + 1,
      line: min + 1
    }
  }

  mapResolve(file) {
    if (/^\w+:\/\//.test(file)) {
      return file
    }
    return resolve(this.map.consumer().sourceRoot || this.map.root || '.', file)
  }

  origin(line, column, endLine, endColumn) {
    if (!this.map) return false
    let consumer = this.map.consumer()

    let from = consumer.originalPositionFor({ column, line })
    if (!from.source) return false

    let to
    if (typeof endLine === 'number') {
      to = consumer.originalPositionFor({ column: endColumn, line: endLine })
    }

    let fromUrl

    if (isAbsolute(from.source)) {
      fromUrl = pathToFileURL(from.source)
    } else {
      fromUrl = new URL(
        from.source,
        this.map.consumer().sourceRoot || pathToFileURL(this.map.mapFile)
      )
    }

    let result = {
      column: from.column,
      endColumn: to && to.column,
      endLine: to && to.line,
      line: from.line,
      url: fromUrl.toString()
    }

    if (fromUrl.protocol === 'file:') {
      if (fileURLToPath) {
        result.file = fileURLToPath(fromUrl)
      } else {
        /* c8 ignore next 2 */
        throw new Error(`file: protocol is not available in this PostCSS build`)
      }
    }

    let source = consumer.sourceContentFor(from.source)
    if (source) result.source = source

    return result
  }

  toJSON() {
    let json = {}
    for (let name of ['hasBOM', 'css', 'file', 'id']) {
      if (this[name] != null) {
        json[name] = this[name]
      }
    }
    if (this.map) {
      json.map = { ...this.map }
      if (json.map.consumerCache) {
        json.map.consumerCache = undefined
      }
    }
    return json
  }

  get from() {
    return this.file || this.id
  }
}

module.exports = Input
Input.default = Input

if (terminalHighlight && terminalHighlight.registerInput) {
  terminalHighlight.registerInput(Input)
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox