import { useState, useEffect } from 'react'

export interface FontOption {
  label: string
  value: string
}

const DEFAULT_FONTS: FontOption[] = [
  { label: '黑体', value: 'SimHei, sans-serif' },
  { label: '宋体', value: 'SimSun, serif' },
  {
    label: '微软雅黑',
    value: 'Microsoft YaHei, sans-serif',
  },
  { label: 'PingFang SC', value: 'PingFang SC, sans-serif' },
  { label: 'Inter', value: 'Inter, sans-serif' },
]

let cachedFonts: FontOption[] | null = null

export function useLocalFonts() {
  const [fonts, setFonts] = useState<FontOption[]>(cachedFonts || DEFAULT_FONTS)
  const [loading, setLoading] = useState(false)

  useEffect(() => {
    if (cachedFonts && cachedFonts.length > DEFAULT_FONTS.length) {
      return
    }

    async function loadLocalFonts() {
      // Check if the API is supported
      if (!('queryLocalFonts' in window)) {
        return
      }

      try {
        setLoading(true)
        // @ts-expect-error - queryLocalFonts is a new API
        const localFonts = await window.queryLocalFonts()

        // Group by family and take the first one (usually the regular style)
        // or just use unique families
        const families = new Set<string>()
        const dynamicFonts: FontOption[] = []

        localFonts.forEach((font: any) => {
          if (!families.has(font.family)) {
            families.add(font.family)
            dynamicFonts.push({
              label: font.family,
              value: font.family,
            })
          }
        })

        // Sort alphabetically
        dynamicFonts.sort((a, b) => a.label.localeCompare(b.label))

        // Combine with defaults, ensuring no duplicates by family name
        const combined = [...DEFAULT_FONTS]
        const defaultFamilies = new Set(DEFAULT_FONTS.map(f => f.label))

        dynamicFonts.forEach(df => {
          if (!defaultFamilies.has(df.label)) {
            combined.push(df)
          }
        })

        cachedFonts = combined
        setFonts(combined)
      } catch (err) {
        console.error('Failed to query local fonts:', err)
        // Fallback is already set as initial state
      } finally {
        setLoading(false)
      }
    }

    loadLocalFonts()
  }, [])

  return { fonts, loading }
}