import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import { useApi } from '../composables/useApi.js'

export const useModalStore = defineStore('modal', () => {
  const api = useApi()

  const currentImageId = ref(null)
  const current = ref(null)
  const loading = ref(false)
  const error = ref(null)

  // Post-scoped cycle. When set, prev/next cycles within this array
  // (used by PostCard's expanded-mosaic PostImageGrid clicks). When
  // null, prev/next falls back to current.value.neighbors (the
  // gallery-store-driven /api/gallery/image/<id> neighbors).
  const postImageIds = ref(null)
  const postImageIndex = ref(0)

  async function open (id, opts = {}) {
    currentImageId.value = id
    loading.value = true
    error.value = null
    // Update post-scoped state if caller passed it; otherwise clear so
    // the next open() from gallery context uses neighbors mode.
    if (opts.postImageIds != null) {
      postImageIds.value = opts.postImageIds
      postImageIndex.value = opts.postImageIds.indexOf(id)
      if (postImageIndex.value < 0) postImageIndex.value = 0
    } else if (opts.clearPostScope !== false && postImageIds.value != null) {
      postImageIds.value = null
      postImageIndex.value = 0
    }
    try {
      current.value = await api.get(`/api/gallery/image/${id}`)
    } catch (e) {
      error.value = e.message
      current.value = null
    } finally {
      loading.value = false
    }
  }

  async function close () {
    currentImageId.value = null
    current.value = null
    error.value = null
    postImageIds.value = null
    postImageIndex.value = 0
  }

  async function goPrev () {
    if (postImageIds.value != null) {
      if (postImageIndex.value > 0) {
        const newIdx = postImageIndex.value - 1
        const newId = postImageIds.value[newIdx]
        postImageIndex.value = newIdx
        await open(newId, { postImageIds: postImageIds.value })
      }
      return
    }
    if (current.value && current.value.neighbors?.prev_id) {
      await open(current.value.neighbors.prev_id)
    }
  }

  async function goNext () {
    if (postImageIds.value != null) {
      if (postImageIndex.value < postImageIds.value.length - 1) {
        const newIdx = postImageIndex.value + 1
        const newId = postImageIds.value[newIdx]
        postImageIndex.value = newIdx
        await open(newId, { postImageIds: postImageIds.value })
      }
      return
    }
    if (current.value && current.value.neighbors?.next_id) {
      await open(current.value.neighbors.next_id)
    }
  }

  async function reloadTags () {
    if (!currentImageId.value) return
    const tags = await api.get(`/api/images/${currentImageId.value}/tags`)
    if (current.value) current.value.tags = tags
  }

  async function removeTag (tagId) {
    if (!currentImageId.value) return
    const prev = current.value.tags
    current.value.tags = current.value.tags.filter(t => t.id !== tagId)
    try {
      await api.delete(`/api/images/${currentImageId.value}/tags/${tagId}`)
      await api.post(`/api/images/${currentImageId.value}/suggestions/dismiss`, {
        body: { tag_id: tagId },
      })
    } catch (e) {
      current.value.tags = prev
      window.__fcToast?.({ text: `Failed to remove tag: ${e.message}`, type: 'error' })
      throw e
    }
  }

  async function addExistingTag (tagId) {
    if (!currentImageId.value) return
    await api.post(`/api/images/${currentImageId.value}/tags`, {
      body: { tag_id: tagId, source: 'manual' },
    })
    await reloadTags()
  }

  async function createAndAdd ({ name, kind, fandom_id = null }) {
    const tag = await api.post('/api/tags', { body: { name, kind, fandom_id } })
    await addExistingTag(tag.id)
  }

  const isOpen = computed(() => currentImageId.value !== null)
  const canPrev = computed(() => {
    if (postImageIds.value != null) return postImageIndex.value > 0
    return current.value?.neighbors?.prev_id != null
  })
  const canNext = computed(() => {
    if (postImageIds.value != null) {
      return postImageIndex.value < (postImageIds.value.length - 1)
    }
    return current.value?.neighbors?.next_id != null
  })

  return {
    currentImageId, current, loading, error,
    postImageIds, postImageIndex,
    isOpen, canPrev, canNext,
    open, close, goPrev, goNext,
    reloadTags, removeTag, addExistingTag, createAndAdd,
  }
})