import { useEffect, useState } from 'react'
import { Plus } from 'lucide-react'
import { useToast } from '../context/ToastContext'
import { BrandModal } from '../components/BrandModal'
import { BrandRow } from '../components/BrandRow'
import { Breadcrumbs } from '../components/Breadcrumbs'
import { PageTitle } from '../components/PageTitle'
import { ConfirmDeleteModal } from '../components/ConfirmDeleteModal'
import type { Brand, BrandFormData } from '../types/brand'
import { ApiError } from '../lib/api'
import { resolveDataUrlToMediaId } from '../services/mediaService'
import {
  createBrand,
  deleteBrand,
  listAllBrands,
  mapBrandApiToUi,
  toBrandFormPayload,
  updateBrand,
} from '../services/brandService'
import { useT } from '../i18n/useT'
import pageStyles from '../components/PageContent.module.css'
import styles from './BrandsPage.module.css'

export function BrandsPage() {
  const t = useT()
  const { showToast } = useToast()
  const [brands, setBrands] = useState<Brand[]>([])
  const [modalOpen, setModalOpen] = useState(false)
  const [modalTitle, setModalTitle] = useState(() => t('brands.add'))
  const [editingBrand, setEditingBrand] = useState<Brand | null>(null)
  const [isLoading, setIsLoading] = useState(true)
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [error, setError] = useState('')
  const [deleteTarget, setDeleteTarget] = useState<Brand | null>(null)

  useEffect(() => {
    const controller = new AbortController()
    void loadBrands(controller.signal)
    return () => controller.abort()
  }, [])

  async function loadBrands(signal?: AbortSignal) {
    setIsLoading(true)
    setError('')
    try {
      const items = await listAllBrands(signal)
      setBrands(items.map(mapBrandApiToUi))
    } catch (err) {
      if (err instanceof DOMException && err.name === 'AbortError') return
      if (err instanceof ApiError) {
        setError(err.message)
      } else {
        setError(t('brands.errorLoad'))
      }
    } finally {
      setIsLoading(false)
    }
  }

  function openCreateModal() {
    setEditingBrand(null)
    setModalTitle(t('brands.add'))
    setModalOpen(true)
  }

  function openEditModal(brand: Brand) {
    setEditingBrand(brand)
    setModalTitle(t('brands.edit'))
    setModalOpen(true)
  }

  async function handleSubmit(data: BrandFormData) {
    setIsSubmitting(true)
    setError('')

    try {
      const resolvedImageMediaId = await resolveDataUrlToMediaId(
        data.image,
        'brand-logo.png',
        data.imageMediaId,
      )

      if (editingBrand) {
        const result = await updateBrand(editingBrand.id, {
          ...toBrandFormPayload(data),
          imageMediaId: resolvedImageMediaId,
        })
        setBrands((prev) =>
          prev.map((brand) =>
            brand.id === editingBrand.id ? mapBrandApiToUi(result.brand) : brand,
          ),
        )
        showToast(t('brands.toast.updated'), 'success')
      } else {
        const result = await createBrand(toBrandFormPayload(data, resolvedImageMediaId))
        setBrands((prev) => [...prev, mapBrandApiToUi(result.brand)])
        showToast(t('brands.toast.created'), 'success')
      }

      setModalOpen(false)
      setEditingBrand(null)
    } catch (err) {
      if (err instanceof ApiError) {
        setError(err.message)
      } else {
        setError(t('brands.errorSave'))
      }
    } finally {
      setIsSubmitting(false)
    }
  }

  async function confirmDelete() {
    if (!deleteTarget) return

    setIsSubmitting(true)
    setError('')

    try {
      await deleteBrand(deleteTarget.id)
      setBrands((prev) => prev.filter((brand) => brand.id !== deleteTarget.id))
      setDeleteTarget(null)
      showToast(t('brands.toast.deleted'), 'success')
    } catch (err) {
      if (err instanceof ApiError) {
        setError(err.message)
      } else {
        setError(t('brands.errorDelete'))
      }
    } finally {
      setIsSubmitting(false)
    }
  }

  return (
    <main className={pageStyles.content}>
      <Breadcrumbs
        items={[
          { label: 'Dashboard', href: '/' },
          { label: 'Products', href: '/products' },
          { label: 'Brands' },
        ]}
      />
      <div className={pageStyles.pageHeader}>
        <div>
          <PageTitle en="BRANDS">{t('title.brands')}</PageTitle>
          <p className={pageStyles.pageSubtitle}>{t('brands.page.subtitle')}</p>
        </div>
      </div>

      {error && (
        <div className={styles.error} role="alert">
          {error}
        </div>
      )}

      <div className={styles.list}>
        {isLoading ? (
          <p className={styles.empty}>{t('brands.loading')}</p>
        ) : brands.length === 0 ? (
          <p className={styles.empty}>{t('brands.empty')}</p>
        ) : (
          brands.map((brand) => (
            <BrandRow
              key={brand.id}
              brand={brand}
              onEdit={(id) => {
                const item = brands.find((entry) => entry.id === id)
                if (item) openEditModal(item)
              }}
              onRemove={(id) => {
                const item = brands.find((entry) => entry.id === id)
                if (item) setDeleteTarget(item)
              }}
            />
          ))
        )}
      </div>

      <BrandModal
        open={modalOpen}
        onClose={() => {
          if (!isSubmitting) {
            setModalOpen(false)
            setEditingBrand(null)
          }
        }}
        onSubmit={handleSubmit}
        editingBrand={editingBrand}
        title={modalTitle}
        isSubmitting={isSubmitting}
      />

      <ConfirmDeleteModal
        open={!!deleteTarget}
        title={t('brands.deleteTitle')}
        message={
          deleteTarget
            ? t('brands.deleteMessage', {
                name: deleteTarget.nameFa || deleteTarget.nameEn,
              })
            : ''
        }
        onConfirm={confirmDelete}
        onCancel={() => !isSubmitting && setDeleteTarget(null)}
      />

      <div className={styles.fabDock}>
        <button
          type="button"
          className={styles.addFab}
          onClick={openCreateModal}
          aria-label={t('brands.add')}
        >
          <Plus size={24} />
        </button>
      </div>
    </main>
  )
}
