import com.intellij.database.model.DasTable
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil

/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 */

packageName = "pl.monusky.gotpttk.dataAccess.entity"
typeMapping = [
  (~/(?i)int/)                      : "Long",
  (~/(?i)float|double|decimal|real/): "Double",
  (~/(?i)datetime|timestamp/)       : "LocalDateTime",
  (~/(?i)date/)                     : "Date",
  (~/(?i)time/)                     : "Time",
  (~/(?i)/)                         : "String"
]

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
  SELECTION.filter { it instanceof DasTable }.each { generate(it, dir) }
}

def generate(table, dir) {
  def className = javaName(table.getName(), true)
  def fields = calcFields(table)
  new File(dir, className + ".kt").withPrintWriter { out -> generate(table, out, className, fields) }
}

def generate(table, out, className, fields) {
  out.println "package $packageName"
  out.println ""
  if (table.getName().contains("_")) {
    out.println "import pl.monusky.gotpttk.dataAccess.entity.$className" + ".Companion.TABLE_NAME"
  }
  out.println "import javax.persistence.*"
  out.println "import java.time.LocalDateTime"
  out.println ""
  out.println "@Entity"
  if (table.getName().contains("_")) {
    out.println "@Table(name = TABLE_NAME)"
  }
  out.println "class $className : AbstractJpaPersistable<Long>() {"
  out.println ""
  fields.each() {
    if (it.name != "id") {
      if (it.annos != "") out.println "  ${it.annos}"
      out.println "    var ${it.name}: ${it.type}? = null"
      out.println ""
    }
  }
  out.println ""
  out.println ""
  printCompanion(table, out, fields)
  out.println "}"
}

def calcFields(table) {
  DasUtil.getColumns(table).reduce([]) { fields, col ->
    def spec = Case.LOWER.apply(col.getDataType().getSpecification())
    def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value
    fields += [[
                 name : javaName(col.getName(), false),
                 type : typeStr,
                 annos: ""]]
  }
}

def javaName(str, capitalize) {
  def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
    .collect { Case.LOWER.apply(it).capitalize() }
    .join("")
    .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
  capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}

def printCompanion(table, out, fields) {
  out.println "    companion object {"
  out.println "        const val TABLE_NAME = " + getTextAsString(table.getName())
  out.println "        const val COLUMN_ID = " + getTextAsString("ID")
  def companionFields = getCompanionFields(table)
  companionFields.each() {
    if(it.key != "ID") {
      def key = it.key
      def value = it.value
      out.println "        const val COLUMN_$key = $value"
    }
  }

  out.println "    }"
}

def getCompanionFields(table) {
  return DasUtil.getColumns(table).reduce([]) { fields, col ->
    fields += [[key : getCompanionKey(col.getName()), value : getTextAsString(javaName(col.getName(), true))]]
  }
}

def getCompanionKey(str) {
  def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
          .collect { it.toUpperCase() }
          .join("_")
          .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
}

def getTextAsString(text) {
  return '"' + text + '"'
}