/*
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 { useMemo, useState } from 'react'
import * as z from 'zod'
import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { Plus, Edit, Trash2, Save } from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { toast } from 'sonner'
import { getBgColorClass } from '@/lib/colors'
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog'
import { Button } from '@/components/ui/button'
import { Checkbox } from '@/components/ui/checkbox'
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
import { Input } from '@/components/ui/input'
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select'
import { BadgeCell, StaticDataTable } from '@/components/data-table'
import { Dialog } from '@/components/dialog'
import { StatusBadge } from '@/components/status-badge'
import { SettingsSwitchField } from '../components/settings-form-layout'
import { SettingsSection } from '../components/settings-section'
import { useUpdateOption } from '../hooks/use-update-option'

type ApiInfo = {
  id: number
  url: string
  route: string
  description: string
  color: string
}

type ApiInfoSectionProps = {
  enabled: boolean
  data: string
}

const createApiInfoSchema = (t: (key: string) => string) =>
  z.object({
    url: z.string().url(t('Must be a valid URL')),
    route: z.string().min(1, t('Route is required')),
    description: z.string().min(1, t('Description is required')),
    color: z.string().min(1, t('Color is required')),
  })

type ApiInfoFormValues = z.infer<ReturnType<typeof createApiInfoSchema>>

const API_INFO_FORM_ID = 'api-info-form'

const colorOptions = [
  { value: 'blue', label: 'Blue' },
  { value: 'green', label: 'Green' },
  { value: 'cyan', label: 'Cyan' },
  { value: 'purple', label: 'Purple' },
  { value: 'pink', label: 'Pink' },
  { value: 'red', label: 'Red' },
  { value: 'orange', label: 'Orange' },
  { value: 'amber', label: 'Amber' },
  { value: 'yellow', label: 'Yellow' },
  { value: 'lime', label: 'Lime' },
  { value: 'teal', label: 'Teal' },
  { value: 'indigo', label: 'Indigo' },
  { value: 'violet', label: 'Violet' },
  { value: 'slate', label: 'Slate' },
]

function parseApiInfoList(data: string): ApiInfo[] {
  try {
    const parsed = JSON.parse(data || '[]')
    if (!Array.isArray(parsed)) return []

    return parsed.map((item, idx) => ({
      ...item,
      id: item.id || idx + 1,
    }))
  } catch {
    return []
  }
}

export function ApiInfoSection({ enabled, data }: ApiInfoSectionProps) {
  const { t } = useTranslation()
  const updateOption = useUpdateOption()
  const apiInfoSchema = createApiInfoSchema(t)
  const parsedApiInfoList = useMemo(() => parseApiInfoList(data), [data])
  const [draftApiInfoList, setDraftApiInfoList] = useState<ApiInfo[] | null>(
    null
  )
  const [isEnabledDraft, setIsEnabledDraft] = useState<boolean | null>(null)
  const [selectedIds, setSelectedIds] = useState<number[]>([])
  const [showDialog, setShowDialog] = useState(false)
  const [showDeleteDialog, setShowDeleteDialog] = useState(false)
  const [editingApiInfo, setEditingApiInfo] = useState<ApiInfo | null>(null)
  const [deleteTarget, setDeleteTarget] = useState<'single' | 'batch'>('single')
  const apiInfoList = draftApiInfoList ?? parsedApiInfoList
  const isEnabled = isEnabledDraft ?? enabled
  const hasChanges = draftApiInfoList !== null

  const form = useForm<ApiInfoFormValues>({
    resolver: zodResolver(apiInfoSchema),
    defaultValues: {
      url: '',
      route: '',
      description: '',
      color: 'blue',
    },
  })

  const handleToggleEnabled = async (checked: boolean) => {
    try {
      await updateOption.mutateAsync({
        key: 'console_setting.api_info_enabled',
        value: checked,
      })
      setIsEnabledDraft(checked)
      toast.success(t('Setting saved'))
    } catch {
      toast.error(t('Failed to update setting'))
    }
  }

  const handleAdd = () => {
    setEditingApiInfo(null)
    form.reset({
      url: '',
      route: '',
      description: '',
      color: 'blue',
    })
    setShowDialog(true)
  }

  const handleEdit = (apiInfo: ApiInfo) => {
    setEditingApiInfo(apiInfo)
    form.reset({
      url: apiInfo.url,
      route: apiInfo.route,
      description: apiInfo.description,
      color: apiInfo.color,
    })
    setShowDialog(true)
  }

  const handleDelete = (apiInfo: ApiInfo) => {
    setEditingApiInfo(apiInfo)
    setDeleteTarget('single')
    setShowDeleteDialog(true)
  }

  const handleBatchDelete = () => {
    if (selectedIds.length === 0) {
      toast.error(t('Please select items to delete'))
      return
    }
    setDeleteTarget('batch')
    setShowDeleteDialog(true)
  }

  const confirmDelete = () => {
    if (deleteTarget === 'single' && editingApiInfo) {
      setDraftApiInfoList(
        apiInfoList.filter((item) => item.id !== editingApiInfo.id)
      )
      toast.success(t('API info deleted. Click "Save Settings" to apply.'))
    } else if (deleteTarget === 'batch') {
      setDraftApiInfoList(
        apiInfoList.filter((item) => !selectedIds.includes(item.id))
      )
      setSelectedIds([])
      toast.success(
        t('{{count}} API entries deleted. Click "Save Settings" to apply.', {
          count: selectedIds.length,
        })
      )
    }
    setShowDeleteDialog(false)
    setEditingApiInfo(null)
  }

  const handleSubmitForm = (values: ApiInfoFormValues) => {
    if (editingApiInfo) {
      setDraftApiInfoList(
        apiInfoList.map((item) =>
          item.id === editingApiInfo.id ? { ...item, ...values } : item
        )
      )
      toast.success(t('API info updated. Click "Save Settings" to apply.'))
    } else {
      const newId = Math.max(...apiInfoList.map((item) => item.id), 0) + 1
      setDraftApiInfoList([...apiInfoList, { id: newId, ...values }])
      toast.success(t('API info added. Click "Save Settings" to apply.'))
    }
    setShowDialog(false)
  }

  const handleSaveAll = async () => {
    try {
      const result = await updateOption.mutateAsync({
        key: 'console_setting.api_info',
        value: JSON.stringify(apiInfoList),
      })
      if (result.success) {
        setDraftApiInfoList(null)
      }
    } catch {
      toast.error(t('Failed to save API info'))
    }
  }

  const toggleSelectAll = (checked: boolean) => {
    setSelectedIds(checked ? apiInfoList.map((item) => item.id) : [])
  }

  const toggleSelectOne = (id: number, checked: boolean) => {
    setSelectedIds((prev) =>
      checked ? [...prev, id] : prev.filter((item) => item !== id)
    )
  }

  const getColorClass = (color: string) => getBgColorClass(color)

  return (
    <SettingsSection title={t('API Addresses')}>
      <div className='space-y-4'>
        <div className='flex flex-wrap items-center justify-between gap-2'>
          <div className='flex flex-wrap items-center gap-2'>
            <Button onClick={handleAdd} size='sm'>
              <Plus className='mr-2 h-4 w-4' />
              {t('Add API')}
            </Button>
            <Button
              onClick={handleBatchDelete}
              size='sm'
              variant='destructive'
              disabled={selectedIds.length === 0}
            >
              <Trash2 className='mr-2 h-4 w-4' />
              {t('Delete (')}
              {selectedIds.length})
            </Button>
            <Button
              onClick={handleSaveAll}
              size='sm'
              variant='secondary'
              disabled={!hasChanges || updateOption.isPending}
            >
              <Save className='mr-2 h-4 w-4' />
              {updateOption.isPending ? t('Saving...') : t('Save Settings')}
            </Button>
          </div>
          <SettingsSwitchField
            checked={isEnabled}
            onCheckedChange={handleToggleEnabled}
            label={t('Enabled')}
            className='py-0'
          />
        </div>

        <StaticDataTable
          data={apiInfoList}
          getRowKey={(apiInfo) => apiInfo.id}
          emptyContent={t('No API Domains yet. Click "Add API" to create one.')}
          columns={[
            {
              id: 'select',
              header: (
                <Checkbox
                  checked={
                    selectedIds.length === apiInfoList.length &&
                    apiInfoList.length > 0
                  }
                  onCheckedChange={toggleSelectAll}
                />
              ),
              className: 'w-12',
              cell: (apiInfo) => (
                <Checkbox
                  checked={selectedIds.includes(apiInfo.id)}
                  onCheckedChange={(checked) =>
                    toggleSelectOne(apiInfo.id, checked as boolean)
                  }
                />
              ),
            },
            {
              id: 'url',
              header: t('URL'),
              cellClassName: 'max-w-xs truncate font-mono text-sm',
              cell: (apiInfo) => (
                <BadgeCell>
                  <StatusBadge
                    label={apiInfo.url}
                    variant='neutral'
                    copyable={false}
                  />
                </BadgeCell>
              ),
            },
            {
              id: 'route',
              header: t('Route'),
              cell: (apiInfo) => (
                <BadgeCell>
                  <StatusBadge
                    label={apiInfo.route}
                    variant='neutral'
                    copyable={false}
                  />
                </BadgeCell>
              ),
            },
            {
              id: 'description',
              header: t('Description'),
              cellClassName: 'max-w-xs truncate',
              cell: (apiInfo) => apiInfo.description,
            },
            {
              id: 'color',
              header: t('Color'),
              cell: (apiInfo) => (
                <div className='flex items-center gap-2'>
                  <div
                    className={`h-4 w-4 rounded-full ${getColorClass(apiInfo.color)}`}
                  />
                  <span className='text-sm capitalize'>{apiInfo.color}</span>
                </div>
              ),
            },
            {
              id: 'actions',
              header: t('Actions'),
              className: 'w-32',
              cell: (apiInfo) => (
                <div className='flex gap-2'>
                  <Button
                    onClick={() => handleEdit(apiInfo)}
                    size='sm'
                    variant='ghost'
                  >
                    <Edit className='h-4 w-4' />
                  </Button>
                  <Button
                    onClick={() => handleDelete(apiInfo)}
                    size='sm'
                    variant='ghost'
                  >
                    <Trash2 className='h-4 w-4' />
                  </Button>
                </div>
              ),
            },
          ]}
        />
      </div>

      <Dialog
        open={showDialog}
        onOpenChange={setShowDialog}
        title={editingApiInfo ? t('Edit API Shortcut') : t('Add API Shortcut')}
        description={t('Configure API documentation links for the dashboard')}
        contentHeight='auto'
        bodyClassName='space-y-4'
        footer={
          <>
            <Button
              type='button'
              variant='outline'
              onClick={() => setShowDialog(false)}
            >
              {t('Cancel')}
            </Button>
            <Button type='submit' form={API_INFO_FORM_ID}>
              {editingApiInfo ? t('Update') : t('Add')}
            </Button>
          </>
        }
      >
        <Form {...form}>
          <form
            id={API_INFO_FORM_ID}
            onSubmit={form.handleSubmit(handleSubmitForm)}
            className='space-y-4'
          >
            <FormField
              control={form.control}
              name='url'
              render={({ field }) => (
                <FormItem>
                  <FormLabel>{t('API URL')}</FormLabel>
                  <FormControl>
                    <Input
                      placeholder={t('https://api.example.com')}
                      {...field}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name='route'
              render={({ field }) => (
                <FormItem>
                  <FormLabel>{t('Route Description')}</FormLabel>
                  <FormControl>
                    <Input placeholder={t('e.g., CN2 GIA')} {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name='description'
              render={({ field }) => (
                <FormItem>
                  <FormLabel>{t('Description')}</FormLabel>
                  <FormControl>
                    <Input
                      placeholder={t(
                        'e.g., Recommended for China Mainland Users'
                      )}
                      {...field}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name='color'
              render={({ field }) => (
                <FormItem>
                  <FormLabel>{t('Badge Color')}</FormLabel>
                  <Select
                    items={colorOptions.map((option) => ({
                        value: option.value,
                        label: (
                          <div className='flex items-center gap-2'>
                            <div
                              className={`h-4 w-4 rounded-full ${getBgColorClass(option.value)}`}
                            />
                            {option.label}
                          </div>
                        ),
                      }))}
                    onValueChange={field.onChange}
                    value={field.value}
                  >
                    <FormControl>
                      <SelectTrigger>
                        <SelectValue placeholder={t('Select a color')} />
                      </SelectTrigger>
                    </FormControl>
                    <SelectContent alignItemWithTrigger={false}>
                      <SelectGroup>
                        {colorOptions.map((option) => (
                          <SelectItem key={option.value} value={option.value}>
                            <div className='flex items-center gap-2'>
                              <div
                                className={`h-4 w-4 rounded-full ${getBgColorClass(option.value)}`}
                              />
                              {option.label}
                            </div>
                          </SelectItem>
                        ))}
                      </SelectGroup>
                    </SelectContent>
                  </Select>
                  <FormDescription>
                    {t('Visual indicator color for the API card')}
                  </FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
          </form>
        </Form>
      </Dialog>

      <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{t('Are you sure?')}</AlertDialogTitle>
            <AlertDialogDescription>
              {deleteTarget === 'single'
                ? 'This API shortcut will be removed from the list.'
                : `${selectedIds.length} API shortcuts will be removed from the list.`}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{t('Cancel')}</AlertDialogCancel>
            <AlertDialogAction onClick={confirmDelete}>
              {t('Delete')}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </SettingsSection>
  )
}