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package pl.mareklangiewicz.kgroundx.maintenance

import okio.*
import pl.mareklangiewicz.annotations.*
import pl.mareklangiewicz.io.*
import pl.mareklangiewicz.kground.io.UFileSys
import pl.mareklangiewicz.kground.io.implictx
import pl.mareklangiewicz.kommand.core.*
import pl.mareklangiewicz.ulog.*
import pl.mareklangiewicz.ure.*
import pl.mareklangiewicz.ure.ure
import pl.mareklangiewicz.ure.ureSpecialRegion
import pl.mareklangiewicz.ure.ureText
import pl.mareklangiewicz.ure.ureWhateva
import pl.mareklangiewicz.ure.withName

// FIXME NOW separate it from Ure and move Ure common code to better places (later to separate lib)


@OptIn(NotPortableApi::class, DelicateApi::class)
suspend fun Path.injectSpecialRegion(
  specialLabel: String,
  region: String,
  addIfNotFound: Boolean = true,
) {
  val log = implictx()
  val regexAllWithSpecialRegion = ure {
    +ureWhateva().withName("before")
    +ureSpecialRegion(ureWhateva(), specialLabel = ureText(specialLabel)).withName("region")
    +ureWhateva(reluctant = false).withName("after")
  }.compile()
  processFile(this, this) { output ->
    val outputMR = regexAllWithSpecialRegion.matchEntire(output)
    if (outputMR == null) {
      log.i("Inject [[$specialLabel]] to $this - No match.")
      if (addIfNotFound) {
        log.i("Adding new region at the end.")
        output + "\n\n" + region.trimEnd()
      } else null
    } else {
      val before by outputMR
      val after by outputMR
      val newAfter = if (after.isNotEmpty() && region.last() != '\n') "\n" + after else after

      // val newRegion = if (newAfter.isEmpty()) region.trimEnd() else region
      val newRegion = region
      // FIXME_later: not sure why region was trimmed when at the end,
      // but I now have .editorconfig:insert_final_new_line, so I don't want that.
      // later analyze it more and refactor to clean and correct implementation of these injects

      val newOutput = before + newRegion + newAfter
      val summary =
        if (newOutput == output) "No changes." else "Changes detected (len ${output.length}->${newOutput.length})"
      log.i("Inject [[$specialLabel]] to $this - $summary")
      newOutput
    }
  }
}

suspend fun Path.injectSpecialRegionContentFromFile(
  regionLabel: String,
  regionContentFile: Path,
  addIfNotFound: Boolean = true,
  regionContentMap: suspend (String) -> String = { "// region [[$regionLabel]]\n\n$it\n// endregion [[$regionLabel]]\n" },
) {
  val regionContent = implictx().readUtf8(regionContentFile)
  val region = regionContentMap(regionContent)
  injectSpecialRegion(regionLabel, region, addIfNotFound)
}

@OptIn(DelicateApi::class)
suspend fun downloadAndInjectFileToSpecialRegion(
  inFileUrl: String,
  outFilePath: Path,
  outFileRegionLabel: String,
) {
  val inFilePath = curlDownloadTmpFile(inFileUrl)
  outFilePath.injectSpecialRegionContentFromFile(outFileRegionLabel, inFilePath)
  implictx().delete(inFilePath)
}