import type { Row, Table as TanstackTable } from '@tanstack/react-table'
/*
Copyright (C) 2023-2026 QuantumNous

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

For commercial licensing, please contact support@quantumnous.com
*/
import * as React from 'react'

import { Table, TableBody, TableCell, TableRow } from '@/components/ui/table'
import { cn } from '@/lib/utils'

import {
  getPinnedColumnMap,
  getResolvedColumnClassNameFromMap,
} from './column-pinning'
import { DataTableColgroup } from './data-table-colgroup'
import { DataTableHeader } from './data-table-header'
import { DataTableRow } from './data-table-row'
import { TableEmpty } from './table-empty'
import { getTableSizeStyle } from './table-sizing'
import { TableSkeleton } from './table-skeleton'
import type {
  DataTableColumnClassName,
  DataTablePinnedColumn,
  DataTableViewProps,
} from './types'

export type {
  DataTableColumnClassName,
  DataTablePinnedColumn,
  DataTableRenderRowHelpers,
  DataTableViewProps,
} from './types'
export { DataTableRow } from './data-table-row'

export function DataTableView<TData>(props: DataTableViewProps<TData>) {
  const rows = props.rows ?? props.table.getRowModel().rows
  const colSpan = React.useMemo(
    () => props.table.getVisibleLeafColumns().length,
    [props.table]
  )
  const columnClassName = useResolvedColumnClassName(
    props.table,
    props.getColumnClassName,
    props.pinnedColumns
  )

  return (
    <div
      className={cn(
        'overflow-hidden rounded-lg border',
        props.containerClassName
      )}
      {...props.containerProps}
    >
      {props.splitHeader ? (
        <SplitHeaderTableView
          props={props}
          rows={rows}
          colSpan={colSpan}
          getColumnClassName={columnClassName}
        />
      ) : (
        <UnifiedTableView
          props={props}
          rows={rows}
          colSpan={colSpan}
          getColumnClassName={columnClassName}
        />
      )}
    </div>
  )
}

function UnifiedTableView<TData>({
  props,
  rows,
  colSpan,
  getColumnClassName,
}: {
  props: DataTableViewProps<TData>
  rows: Row<TData>[]
  colSpan: number
  getColumnClassName: DataTableColumnClassName
}) {
  const tableSizing = getTableSizing(props)

  return (
    <div className={props.tableContainerClassName}>
      <Table className={props.tableClassName} style={tableSizing.style}>
        {tableSizing.colgroup}
        <DataTableHeader
          table={props.table}
          applyHeaderSize={props.applyHeaderSize}
          className={props.tableHeaderClassName}
          rowClassName={props.tableHeaderRowClassName}
          getColumnClassName={getColumnClassName}
        />
        {renderTableBody(props, rows, colSpan, getColumnClassName)}
      </Table>
    </div>
  )
}

function SplitHeaderTableView<TData>({
  props,
  rows,
  colSpan,
  getColumnClassName,
}: {
  props: DataTableViewProps<TData>
  rows: Row<TData>[]
  colSpan: number
  getColumnClassName: DataTableColumnClassName
}) {
  const tableSizing = getTableSizing(props)

  return (
    <div
      className={cn(
        'flex h-full min-h-0 flex-col',
        props.tableContainerClassName
      )}
    >
      <div
        className={cn(
          'min-h-0 flex-1 overflow-auto',
          '**:data-[slot=table-header]:[--table-header-bg:var(--table-header)]',
          '**:data-[slot=table-header]:bg-(--table-header-bg)',
          props.splitHeaderScrollClassName,
          props.bodyContainerClassName
        )}
      >
        <table
          data-slot='table'
          className={cn(
            'w-full caption-bottom text-sm tabular-nums [&_td]:text-sm [&_td_*]:text-sm [&_th]:text-sm [&_th_*]:text-sm',
            props.tableClassName
          )}
          style={tableSizing.style}
        >
          {tableSizing.colgroup}
          <DataTableHeader
            table={props.table}
            applyHeaderSize={props.applyHeaderSize}
            className={cn('sticky top-0 z-10', props.tableHeaderClassName)}
            rowClassName={props.tableHeaderRowClassName}
            getColumnClassName={getColumnClassName}
          />
          {renderTableBody(props, rows, colSpan, getColumnClassName)}
        </table>
      </div>
    </div>
  )
}

function useResolvedColumnClassName<TData>(
  table: TanstackTable<TData>,
  getColumnClassName?: DataTableColumnClassName,
  pinnedColumns?: DataTablePinnedColumn[]
) {
  const allPinnedColumns = React.useMemo(() => {
    const metaPinnedColumns = getMetaPinnedColumns(table)
    return mergePinnedColumns(pinnedColumns, metaPinnedColumns)
  }, [table, pinnedColumns])

  const pinnedColumnById = React.useMemo(
    () => getPinnedColumnMap(allPinnedColumns),
    [allPinnedColumns]
  )

  return React.useMemo(
    () =>
      getResolvedColumnClassNameFromMap(getColumnClassName, pinnedColumnById),
    [getColumnClassName, pinnedColumnById]
  )
}

function getMetaPinnedColumns<TData>(
  table: TanstackTable<TData>
): DataTablePinnedColumn[] {
  return table.getAllColumns().flatMap((column) => {
    const side = column.columnDef.meta?.pinned
    if (!side) {
      return []
    }

    return [{ columnId: column.id, side }]
  })
}

function mergePinnedColumns(
  explicitPinnedColumns: DataTablePinnedColumn[] | undefined,
  metaPinnedColumns: DataTablePinnedColumn[]
): DataTablePinnedColumn[] | undefined {
  if (!metaPinnedColumns.length) {
    return explicitPinnedColumns
  }

  if (!explicitPinnedColumns?.length) {
    return metaPinnedColumns
  }

  const explicitColumnIds = new Set(
    explicitPinnedColumns.map((column) => column.columnId)
  )

  return [
    ...explicitPinnedColumns,
    ...metaPinnedColumns.filter(
      (column) => !explicitColumnIds.has(column.columnId)
    ),
  ]
}

function getTableSizing<TData>(props: DataTableViewProps<TData>): {
  colgroup?: React.ReactNode
  style?: React.CSSProperties
} {
  if (props.colgroup) {
    return { colgroup: props.colgroup }
  }

  if (!props.splitHeader && !props.applyHeaderSize) {
    return {}
  }

  return {
    colgroup: <DataTableColgroup table={props.table} />,
    style: getTableSizeStyle(props.table),
  }
}

function renderTableBody<TData>(
  props: DataTableViewProps<TData>,
  rows: Row<TData>[],
  colSpan: number,
  getColumnClassName: DataTableColumnClassName
) {
  return (
    <TableBody className={props.tableBodyClassName}>
      {renderTableBodyContent(props, rows, colSpan, getColumnClassName)}
    </TableBody>
  )
}

function renderTableBodyContent<TData>(
  props: DataTableViewProps<TData>,
  rows: Row<TData>[],
  colSpan: number,
  getColumnClassName: DataTableColumnClassName
) {
  if (props.isLoading) {
    return (
      <TableSkeleton
        table={props.table}
        keyPrefix={props.skeletonKeyPrefix}
        rowHeight={props.skeletonRowHeight}
      />
    )
  }

  if (rows.length === 0) {
    return renderEmptyState(props, colSpan)
  }

  return rows.map((row) =>
    props.renderRow
      ? props.renderRow(row, {
          getCellClassName: (columnId, className) =>
            cn(getColumnClassName(columnId, 'cell'), className),
        })
      : renderDefaultRow(props, row, getColumnClassName)
  )
}

function renderEmptyState<TData>(
  props: DataTableViewProps<TData>,
  colSpan: number
) {
  if (props.emptyContent) {
    return (
      <TableRow>
        <TableCell colSpan={colSpan} className={props.emptyCellClassName}>
          {props.emptyContent}
        </TableCell>
      </TableRow>
    )
  }

  return (
    <TableEmpty
      colSpan={colSpan}
      title={props.emptyTitle}
      description={props.emptyDescription}
      icon={props.emptyIcon}
    >
      {props.emptyAction}
    </TableEmpty>
  )
}

function renderDefaultRow<TData>(
  props: DataTableViewProps<TData>,
  row: Row<TData>,
  getColumnClassName: DataTableColumnClassName
) {
  return (
    <DataTableRow
      key={row.id}
      row={row}
      className={cn(props.tableBodyRowClassName, props.getRowClassName?.(row))}
      getColumnClassName={getColumnClassName}
      cellRenderColumns={props.table.options.columns}
    />
  )
}
