import { useMutation } from '@tanstack/react-query'
import { ChevronDown } from 'lucide-react'
import { useEffect, useState } from 'react'
import { useTranslation } from 'react-i18next'
import { cssColor } from '@/features/admin/channels/lib/format'
import type { BumperFont, BumperTemplateDto } from '@/shared/api/types'
import { Badge } from '@/shared/ui/badge'
import { Button } from '@/shared/ui/button'
import { Input } from '@/shared/ui/input'
import { Label } from '@/shared/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/shared/ui/select'
import { toast } from '@/shared/ui/toast-store'
import { addBumperVariant, deleteBumperTemplate, updateBumperTemplate } from '../api'
import { BumperAudioField, BumperBackgroundField } from './BumperFileFields'
import { BumperPreviewPlayer } from './BumperPreviewPlayer'
import { BumperVariantEditor } from './BumperVariantEditor'

export function BumperTemplateEditor({
  template,
  channelId,
  onChanged,
  onError,
}: Readonly<{
  template: BumperTemplateDto
  /** Канал, чьими глазами смотрим на образцы подстановки; null — общие заглушки. */
  channelId: string | null
  onChanged: () => void
  onError: (e: unknown) => void
}>) {
  const { t } = useTranslation()
  const [open, setOpen] = useState(false)
  const [style, setStyle] = useState({
    name: template.name,
    font: template.font,
    backgroundColor: template.backgroundColor,
    backgroundColor2: template.backgroundColor2,
    accentColor: template.accentColor,
    textColor: template.textColor,
  })

  useEffect(() => {
    setStyle({
      name: template.name,
      font: template.font,
      backgroundColor: template.backgroundColor,
      backgroundColor2: template.backgroundColor2,
      accentColor: template.accentColor,
      textColor: template.textColor,
    })
  }, [template])

  const save = useMutation({
    mutationFn: () => updateBumperTemplate(template.id, { ...style, name: style.name.trim() }),
    onSuccess: () => {
      toast.success(t('settings.saved'))
      onChanged()
    },
    onError,
  })
  const remove = useMutation({
    mutationFn: () => deleteBumperTemplate(template.id),
    onSuccess: onChanged,
    onError,
  })
  const addVariant = useMutation({
    mutationFn: () => addBumperVariant(template.id, t('admin.bumpers.newVariantName')),
    onSuccess: onChanged,
    onError,
  })

  const colorFields = [
    { key: 'backgroundColor', label: t('admin.bumpers.colorBg') },
    { key: 'backgroundColor2', label: t('admin.bumpers.colorBg2') },
    { key: 'accentColor', label: t('admin.bumpers.colorAccent') },
    { key: 'textColor', label: t('admin.bumpers.colorText') },
  ] as const

  return (
    <div className="flex flex-col gap-3 rounded-md border border-border bg-muted/30 p-4">
      <div className="flex items-center justify-between gap-2">
        <button
          type="button"
          onClick={() => setOpen((o) => !o)}
          aria-expanded={open}
          className="flex flex-1 cursor-pointer flex-wrap items-center gap-2 text-left"
        >
          <ChevronDown
            className={`h-4 w-4 shrink-0 text-muted-foreground transition-transform ${open ? 'rotate-180' : ''}`}
          />
          <span className="text-sm font-medium">{template.name}</span>
          <span className="text-xs text-muted-foreground">
            {template.hasAudio && template.audioDurationSeconds != null
              ? `≈${Math.round(template.audioDurationSeconds)} ${t('admin.bumpers.seconds')}`
              : t('admin.bumpers.defaultDuration')}
          </span>
          <span className="text-xs text-muted-foreground">
            · {t('admin.bumpers.variantsCount', { count: template.variants.length })}
          </span>
          {/* Блок общий: сколько врезок на него ссылается — не справка, а условие правки. */}
          {template.usageCount > 0 && (
            <Badge variant="muted">
              {t('admin.bumpers.usedInJunctions', { count: template.usageCount })}
            </Badge>
          )}
        </button>
        <Button
          size="sm"
          variant="destructive"
          disabled={remove.isPending || template.usageCount > 0}
          title={template.usageCount > 0 ? t('admin.bumpers.cannotDeleteUsed') : undefined}
          onClick={() => remove.mutate()}
        >
          {t('common.delete')}
        </Button>
      </div>

      {open && (
        <>
          <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
            <div className="flex flex-col gap-1.5">
              <Label>{t('admin.bumpers.name')}</Label>
              <Input
                value={style.name}
                maxLength={64}
                onChange={(e) => setStyle((s) => ({ ...s, name: e.target.value }))}
              />
            </div>
            <div className="flex flex-col gap-1.5">
              <Label>{t('admin.bumpers.font')}</Label>
              <Select
                value={style.font}
                onValueChange={(v) => setStyle((s) => ({ ...s, font: v as BumperFont }))}
              >
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="Sans">{t('admin.bumpers.fontSans')}</SelectItem>
                  <SelectItem value="Serif">{t('admin.bumpers.fontSerif')}</SelectItem>
                </SelectContent>
              </Select>
            </div>
            {colorFields.map(({ key, label }) => (
              <div key={key} className="flex flex-col gap-1.5">
                <Label>{label}</Label>
                <div className="flex items-center gap-2">
                  <span
                    className="h-8 w-8 shrink-0 rounded border border-border"
                    style={{ backgroundColor: cssColor(style[key]) }}
                  />
                  <Input
                    value={style[key]}
                    onChange={(e) => setStyle((s) => ({ ...s, [key]: e.target.value }))}
                  />
                </div>
              </div>
            ))}
          </div>

          <div className="grid gap-3 border-t border-border pt-3 sm:grid-cols-2">
            <BumperAudioField
              templateId={template.id}
              hasAudio={template.hasAudio}
              onChanged={onChanged}
              onError={onError}
            />
            <BumperBackgroundField
              templateId={template.id}
              backgroundImageId={template.backgroundImageId}
              onChanged={onChanged}
              onError={onError}
            />
          </div>

          <div className="flex justify-end">
            <Button size="sm" disabled={save.isPending} onClick={() => save.mutate()}>
              {t('admin.bumpers.saveStyle')}
            </Button>
          </div>

          <div className="flex flex-col gap-2 border-t border-border pt-3">
            <p className="text-sm font-medium">{t('admin.bumpers.variants')}</p>
            <p className="text-xs text-muted-foreground">{t('admin.bumpers.variantsHint')}</p>
            {[...template.variants]
              .sort((a, b) => a.position - b.position)
              .map((variant) => (
                <BumperVariantEditor
                  key={variant.id}
                  template={template}
                  variant={variant}
                  canRemove={template.variants.length > 1}
                  onChanged={onChanged}
                  onError={onError}
                />
              ))}
            <div>
              <Button
                size="sm"
                variant="outline"
                disabled={addVariant.isPending}
                onClick={() => addVariant.mutate()}
              >
                {t('admin.bumpers.addVariant')}
              </Button>
            </div>
          </div>

          <div className="flex flex-col gap-2 border-t border-border pt-3">
            <BumperPreviewPlayer
              templateId={template.id}
              channelId={channelId}
              variants={template.variants}
              onError={onError}
            />
          </div>
        </>
      )}
    </div>
  )
}