import { defineStore } from 'pinia'
import { toast } from '../utils/toast.js'
import { ref } from 'vue'
import { useApi } from '../composables/useApi.js'
import { useAsyncAction } from '../composables/useAsyncAction.js'
import { useInflightToken } from '../composables/useInflightToken.js'

// Category display order: people first, general last.
// 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01) retired — only
// character and general surface as suggestion categories now.
export const CATEGORY_ORDER = ['character', 'general']
export const CATEGORY_LABELS = {
  character: 'Character',
  general: 'General'
}

export const useSuggestionsStore = defineStore('suggestions', () => {
  const api = useApi()
  const byCategory = ref({})       // { category: [suggestion, ...] }
  const { loading, error, run } = useAsyncAction({ errorAs: 'message' })
  let currentImageId = null
  // Audit 2026-06-02: this store had no inflight guard — a late
  // /suggestions response from a prior image could overwrite
  // byCategory while currentImageId pointed at a new one, and
  // accept() dereferenced currentImageId AFTER an awaited POST so
  // the subsequent /suggestions/accept could apply A's chosen tag
  // to image B (and push it to the allowlist). Both fixed below
  // by capturing imageId at call-time and gating writes on the token.
  const inflight = useInflightToken()

  async function load(imageId) {
    // Cancel any in-flight load from the previous image so its late
    // response can't overwrite this image's byCategory.
    inflight.cancel()
    currentImageId = imageId
    byCategory.value = {}  // cleared upfront so it stays empty on error
    const t = inflight.claim()
    await run(async () => {
      const body = await api.get(`/api/images/${imageId}/suggestions`)
      if (!t.isCurrent()) return
      byCategory.value = body.by_category || {}
    })
  }

  function _drop(category, predicate) {
    const list = byCategory.value[category]
    if (!list) return
    byCategory.value[category] = list.filter(s => !predicate(s))
  }

  async function accept(suggestion) {
    // Capture imageId so a mid-flight prev/next can't reroute the
    // accept POST to a different image AND push the tag to that
    // image's allowlist.
    const imageId = currentImageId
    if (imageId == null) return
    // Raw tags (creates_new_tag) have no canonical_tag_id; the backend's
    // accept endpoint needs a tag_id, so for raw tags we create the tag
    // first via the existing /api/tags endpoint, then accept by id.
    let tagId = suggestion.canonical_tag_id
    if (tagId == null) {
      const created = await api.post('/api/tags', {
        body: { name: suggestion.display_name, kind: suggestion.category }
      })
      tagId = created.id
    }
    await api.post(`/api/images/${imageId}/suggestions/accept`, {
      body: { tag_id: tagId }
    })
    // Only drop from THIS image's category list — if the user navigated,
    // the new image has its own suggestions and this drop would corrupt them.
    if (currentImageId === imageId) {
      _drop(suggestion.category, s => s === suggestion)
    }
    toast({
      text: `Tagged: ${suggestion.display_name}`,
      type: 'success'
    })
  }

  async function aliasAccept(suggestion, canonicalTagId) {
    const imageId = currentImageId
    if (imageId == null) return
    await api.post(`/api/images/${imageId}/suggestions/alias`, {
      body: {
        alias_string: suggestion.display_name,
        alias_category: suggestion.category,
        canonical_tag_id: canonicalTagId
      }
    })
    if (currentImageId === imageId) {
      _drop(suggestion.category, s => s === suggestion)
    }
    toast({
      text: `Aliased & tagged: ${suggestion.display_name}`,
      type: 'success'
    })
  }

  async function dismiss(suggestion) {
    const imageId = currentImageId
    if (imageId == null) return
    // Dismiss needs a tag_id; raw tags have none, so dismissing a raw
    // suggestion just hides it client-side (nothing to persist a rejection
    // against until the tag exists).
    if (suggestion.canonical_tag_id != null) {
      await api.post(`/api/images/${imageId}/suggestions/dismiss`, {
        body: { tag_id: suggestion.canonical_tag_id }
      })
    }
    if (currentImageId === imageId) {
      _drop(suggestion.category, s => s === suggestion)
    }
  }

  return {
    byCategory, loading, error,
    load, accept, aliasAccept, dismiss
  }
})