import { dateToInteger } from '@cityssm/expressjs-server-js/dateTimeFns.js'

type LotNameSearchType = 'startsWith' | 'endsWith' | ''

interface WhereClauseReturn {
  sqlWhereClause: string
  sqlParameters: unknown[]
}

export function getLotNameWhereClause(
  lotName = '',
  lotNameSearchType: LotNameSearchType | undefined,
  lotsTableAlias = 'l'
): WhereClauseReturn {
  let sqlWhereClause = ''
  const sqlParameters: unknown[] = []

  if (lotName !== '') {
    switch (lotNameSearchType) {
      case 'startsWith': {
        sqlWhereClause += ' and ' + lotsTableAlias + ".lotName like ? || '%'"
        sqlParameters.push(lotName)
        break
      }
      case 'endsWith': {
        sqlWhereClause += ' and ' + lotsTableAlias + ".lotName like '%' || ?"
        sqlParameters.push(lotName)
        break
      }
      default: {
        const lotNamePieces = lotName.toLowerCase().split(' ')
        for (const lotNamePiece of lotNamePieces) {
          if (lotNamePiece === '') {
            continue
          }

          sqlWhereClause +=
            ' and instr(lower(' + lotsTableAlias + '.lotName), ?)'
          sqlParameters.push(lotNamePiece)
        }
      }
    }
  }

  return {
    sqlWhereClause,
    sqlParameters
  }
}

type OccupancyTime = '' | 'current' | 'past' | 'future'

export function getOccupancyTimeWhereClause(
  occupancyTime: OccupancyTime | undefined,
  lotOccupanciesTableAlias = 'o'
): WhereClauseReturn {
  let sqlWhereClause = ''
  const sqlParameters: unknown[] = []

  const currentDateString = dateToInteger(new Date())

  switch (occupancyTime ?? '') {
    case 'current': {
      sqlWhereClause +=
        ' and ' +
        lotOccupanciesTableAlias +
        '.occupancyStartDate <= ? and (' +
        lotOccupanciesTableAlias +
        '.occupancyEndDate is null or ' +
        lotOccupanciesTableAlias +
        '.occupancyEndDate >= ?)'
      sqlParameters.push(currentDateString, currentDateString)
      break
    }

    case 'past': {
      sqlWhereClause +=
        ' and ' + lotOccupanciesTableAlias + '.occupancyEndDate < ?'
      sqlParameters.push(currentDateString)
      break
    }

    case 'future': {
      sqlWhereClause +=
        ' and ' + lotOccupanciesTableAlias + '.occupancyStartDate > ?'
      sqlParameters.push(currentDateString)
      break
    }
  }

  return {
    sqlWhereClause,
    sqlParameters
  }
}

export function getOccupantNameWhereClause(
  occupantName = '',
  tableAlias = 'o'
): WhereClauseReturn {
  let sqlWhereClause = ''
  const sqlParameters: unknown[] = []

  if (occupantName !== '') {
    const occupantNamePieces = occupantName.toLowerCase().split(' ')
    for (const occupantNamePiece of occupantNamePieces) {
      if (occupantNamePiece === '') {
        continue
      }

      sqlWhereClause += ` and (instr(lower(${tableAlias}.occupantName), ?) or instr(lower(${tableAlias}.occupantFamilyName), ?))`
      sqlParameters.push(occupantNamePiece, occupantNamePiece)
    }
  }

  return {
    sqlWhereClause,
    sqlParameters
  }
}