import { Row } from "@tanstack/react-table"

export type FilterOperator = 
  | "iLike" | "notILike" | "eq" | "ne" | "isEmpty" | "isNotEmpty"
  | "lt" | "lte" | "gt" | "gte" | "isBetween" | "isRelativeToToday"

export type ColumnType = "text" | "number" | "date" | "boolean" | "select" | "multi-select"

interface FilterValue {
  operator: FilterOperator
  value: any
}

/**
 * 글로벌 필터 함수 생성
 * @param type - 컬럼 타입
 * @returns 필터 함수
 */
export const createFilterFn = (type: ColumnType) => {
  return <TData>(row: Row<TData>, columnId: string, filterValue: FilterValue) => {
    const cellValue = row.getValue(columnId)
    const { operator, value } = filterValue

    // 공통 처리: isEmpty/isNotEmpty
    if (operator === "isEmpty") {
      if (type === "multi-select") {
        return !cellValue || (Array.isArray(cellValue) && cellValue.length === 0)
      }
      return cellValue == null || cellValue === "" || cellValue === undefined
    }

    if (operator === "isNotEmpty") {
      if (type === "multi-select") {
        return cellValue != null && Array.isArray(cellValue) && cellValue.length > 0
      }
      return cellValue != null && cellValue !== "" && cellValue !== undefined
    }

    // value가 없고 isEmpty/isNotEmpty가 아닌 경우
    if ((value === "" || value == null) && operator !== "isEmpty" && operator !== "isNotEmpty") {
      return true
    }

    // 타입별 처리
    switch (type) {
      case "text": {
        const cellStr = String(cellValue || "").toLowerCase()
        const filterStr = String(value || "").toLowerCase()

        switch (operator) {
          case "iLike":
            return cellStr.includes(filterStr)
          case "notILike":
            return !cellStr.includes(filterStr)
          case "eq":
            return cellStr === filterStr
          case "ne":
            return cellStr !== filterStr
          default:
            return true
        }
      }

      case "number": {
        const cellNum = cellValue != null ? Number(cellValue) : null
        const filterNum = value != null ? Number(value) : null

        if (cellNum == null || filterNum == null) {
          return false
        }

        switch (operator) {
          case "eq":
            return cellNum === filterNum
          case "ne":
            return cellNum !== filterNum
          case "lt":
            return cellNum < filterNum
          case "lte":
            return cellNum <= filterNum
          case "gt":
            return cellNum > filterNum
          case "gte":
            return cellNum >= filterNum
          default:
            return true
        }
      }

      case "date": {
        const cellDate = cellValue ? new Date(cellValue as string | Date) : null
        
        if (!cellDate || isNaN(cellDate.getTime())) {
          return false
        }

        switch (operator) {
          case "eq": {
            if (!value) return false
            const filterDate = new Date(value)
            return cellDate.toDateString() === filterDate.toDateString()
          }
          
          case "ne": {
            if (!value) return true
            const filterDate = new Date(value)
            return cellDate.toDateString() !== filterDate.toDateString()
          }
          
          case "lt": {
            if (!value) return false
            const filterDate = new Date(value)
            return cellDate < filterDate
          }
          
          case "lte": {
            if (!value) return false
            const filterDate = new Date(value)
            filterDate.setHours(23, 59, 59, 999) // 그 날의 끝까지 포함
            return cellDate <= filterDate
          }
          
          case "gt": {
            if (!value) return false
            const filterDate = new Date(value)
            return cellDate > filterDate
          }
          
          case "gte": {
            if (!value) return false
            const filterDate = new Date(value)
            filterDate.setHours(0, 0, 0, 0) // 그 날의 시작부터 포함
            return cellDate >= filterDate
          }
          
          case "isBetween": {
            if (!Array.isArray(value) || value.length !== 2) return false
            const [startDate, endDate] = value
            if (!startDate || !endDate) return false
            const start = new Date(startDate)
            const end = new Date(endDate)
            start.setHours(0, 0, 0, 0)
            end.setHours(23, 59, 59, 999)
            return cellDate >= start && cellDate <= end
          }
          
          case "isRelativeToToday": {
            const today = new Date()
            today.setHours(0, 0, 0, 0)
            const tomorrow = new Date(today)
            tomorrow.setDate(tomorrow.getDate() + 1)
            
            // value는 상대적 날짜 지정자 (예: "today", "yesterday", "thisWeek", "lastWeek", "thisMonth", "lastMonth")
            switch (value) {
              case "today":
                return cellDate >= today && cellDate < tomorrow
              
              case "yesterday": {
                const yesterday = new Date(today)
                yesterday.setDate(yesterday.getDate() - 1)
                return cellDate >= yesterday && cellDate < today
              }
              
              case "tomorrow": {
                const dayAfterTomorrow = new Date(tomorrow)
                dayAfterTomorrow.setDate(dayAfterTomorrow.getDate() + 1)
                return cellDate >= tomorrow && cellDate < dayAfterTomorrow
              }
              
              case "thisWeek": {
                const startOfWeek = new Date(today)
                startOfWeek.setDate(today.getDate() - today.getDay()) // 일요일부터 시작
                const endOfWeek = new Date(startOfWeek)
                endOfWeek.setDate(startOfWeek.getDate() + 6)
                endOfWeek.setHours(23, 59, 59, 999)
                return cellDate >= startOfWeek && cellDate <= endOfWeek
              }
              
              case "lastWeek": {
                const startOfLastWeek = new Date(today)
                startOfLastWeek.setDate(today.getDate() - today.getDay() - 7)
                const endOfLastWeek = new Date(startOfLastWeek)
                endOfLastWeek.setDate(startOfLastWeek.getDate() + 6)
                endOfLastWeek.setHours(23, 59, 59, 999)
                return cellDate >= startOfLastWeek && cellDate <= endOfLastWeek
              }
              
              case "thisMonth": {
                const startOfMonth = new Date(today.getFullYear(), today.getMonth(), 1)
                const endOfMonth = new Date(today.getFullYear(), today.getMonth() + 1, 0)
                endOfMonth.setHours(23, 59, 59, 999)
                return cellDate >= startOfMonth && cellDate <= endOfMonth
              }
              
              case "lastMonth": {
                const startOfLastMonth = new Date(today.getFullYear(), today.getMonth() - 1, 1)
                const endOfLastMonth = new Date(today.getFullYear(), today.getMonth(), 0)
                endOfLastMonth.setHours(23, 59, 59, 999)
                return cellDate >= startOfLastMonth && cellDate <= endOfLastMonth
              }
              
              case "thisYear": {
                const startOfYear = new Date(today.getFullYear(), 0, 1)
                const endOfYear = new Date(today.getFullYear(), 11, 31)
                endOfYear.setHours(23, 59, 59, 999)
                return cellDate >= startOfYear && cellDate <= endOfYear
              }
              
              case "lastYear": {
                const startOfLastYear = new Date(today.getFullYear() - 1, 0, 1)
                const endOfLastYear = new Date(today.getFullYear() - 1, 11, 31)
                endOfLastYear.setHours(23, 59, 59, 999)
                return cellDate >= startOfLastYear && cellDate <= endOfLastYear
              }
              
              default:
                // 숫자가 오면 일 단위 상대 날짜로 처리 (예: "7" = 7일 이내, "-7" = 7일 전)
                const days = parseInt(value)
                if (!isNaN(days)) {
                  if (days > 0) {
                    // 미래 n일 이내
                    const futureDate = new Date(today)
                    futureDate.setDate(futureDate.getDate() + days)
                    return cellDate >= today && cellDate <= futureDate
                  } else if (days < 0) {
                    // 과거 n일 이내
                    const pastDate = new Date(today)
                    pastDate.setDate(pastDate.getDate() + days)
                    return cellDate >= pastDate && cellDate <= today
                  }
                }
                return true
            }
          }
          
          default:
            return true
        }
      }

      case "boolean": {
        const cellBool = cellValue === true || cellValue === "true" || cellValue === 1
        const filterBool = value === true || value === "true"

        switch (operator) {
          case "eq":
            return cellBool === filterBool
          case "ne":
            return cellBool !== filterBool
          default:
            return true
        }
      }

      case "select": {
        const cellStr = String(cellValue || "")
        const filterStr = String(value || "")

        switch (operator) {
          case "eq":
            return cellStr === filterStr
          case "ne":
            return cellStr !== filterStr
          default:
            return true
        }
      }

      case "multi-select": {
        const cellArray = Array.isArray(cellValue) ? cellValue : []
        const filterArray = Array.isArray(value) ? value : []

        switch (operator) {
          case "eq":
            // 선택된 모든 값들이 포함되어 있는지 확인
            return filterArray.every(v => cellArray.includes(v))
          case "ne":
            // 선택된 값들 중 하나라도 포함되어 있지 않은지 확인
            return !filterArray.some(v => cellArray.includes(v))
          default:
            return true
        }
      }

      default:
        return true
    }
  }
}

/**
 * AND/OR 조건으로 여러 필터 결합
 * @param filters - 필터 배열
 * @param joinOperator - 결합 연산자 ("and" | "or")
 */
export const combineFilters = <TData>(
  row: Row<TData>,
  filters: Array<{
    columnId: string
    filterValue: FilterValue
    type: ColumnType
  }>,
  joinOperator: "and" | "or" = "and"
): boolean => {
  if (filters.length === 0) return true

  if (joinOperator === "and") {
    return filters.every(filter => {
      const filterFn = createFilterFn(filter.type)
      return filterFn(row, filter.columnId, filter.filterValue)
    })
  } else {
    return filters.some(filter => {
      const filterFn = createFilterFn(filter.type)
      return filterFn(row, filter.columnId, filter.filterValue)
    })
  }
}

/**
 * 테이블 전체에 대한 커스텀 필터 함수
 * ClientDataTableAdvancedFilter와 함께 사용
 */
export const globalFilterFn = <TData>(
  row: Row<TData>,
  columnId: string,
  filterValue: any
): boolean => {
  // filterValue가 객체 형태로 전달되는 경우를 처리
  if (filterValue && typeof filterValue === 'object' && 'filters' in filterValue) {
    const { filters, joinOperator } = filterValue
    return combineFilters(row, filters, joinOperator)
  }
  
  // 단일 필터의 경우
  if (filterValue && typeof filterValue === 'object' && 'operator' in filterValue) {
    // 컬럼 타입을 추론하거나 전달받아야 함
    // 기본적으로 text로 처리
    const filterFn = createFilterFn("text")
    return filterFn(row, columnId, filterValue)
  }
  
  return true
}