import { defineStore } from 'pinia'
import { shallowRef, reactive } from 'vue'
import type { ComAtprotoRepoStrongRef } from '@atcute/atproto'
import { AppBskyFeedDefs, AppBskyFeedPost } from '@atcute/bluesky'
import { ok } from '@atcute/client'

import { useAuthStore } from './auth'

type PostView = AppBskyFeedDefs.PostView

export const usePostStore = defineStore('posts', () => {
	const auth = useAuthStore()

	const posts = shallowRef(new Map<string, PostView>())

	function mergePost(post: PostView): PostView {
		const existing = posts.value.get(post.uri)

		if (existing) {
			Object.assign(existing, post)
			return existing
		} else {
			const reactivePost = reactive(post)
			posts.value.set(post.uri, reactivePost)
			return reactivePost
		}
	}

	async function toggleLike(post: PostView) {
		if (!auth.isAuthenticated) return
		if (!auth.session) return

		const uri = post.uri
		const cid = post.cid

		const originalLike = post.viewer?.like
		const originalCount = post.likeCount || 0

		if (!post.viewer) post.viewer = {}

		if (originalLike) {
			post.viewer.like = undefined
			post.likeCount = originalCount - 1
		} else {
			post.viewer.like = 'at://did:plc:pending/like'
			post.likeCount = originalCount + 1
		}

		try {
			const rpc = auth.getRpc()
			if (originalLike) {
				await rpc.post('com.atproto.repo.deleteRecord', {
					input: {
						collection: 'app.bsky.feed.like',
						repo: auth.session?.info.sub,
						rkey: originalLike.split('/').pop()!,
					},
				})
			} else {
				const data = ok(
					await rpc.post('com.atproto.repo.createRecord', {
						input: {
							collection: 'app.bsky.feed.like',
							repo: auth.session?.info.sub,
							record: {
								$type: 'app.bsky.feed.like',
								subject: { uri, cid },
								createdAt: new Date().toISOString(),
							},
						},
					}),
				)

				const storedPost = posts.value.get(uri)
				if (storedPost && storedPost.viewer) {
					storedPost.viewer.like = data.uri
				}
			}
		} catch (err) {
			console.error('Failed to toggle like', err)
			const storedPost = posts.value.get(uri)
			if (storedPost && storedPost.viewer) {
				storedPost.viewer.like = originalLike
				storedPost.likeCount = originalCount
			}
		}
	}

	async function toggleBookmark(post: PostView, silent = false) {
		if (!auth.isAuthenticated) return
		if (!auth.session) return

		const uri = post.uri
		const cid = post.cid

		const originalBookmarked = post.viewer?.bookmarked
		const originalCount = post.bookmarkCount || 0

		if (!post.viewer) post.viewer = {}

		if (originalBookmarked) {
			post.viewer.bookmarked = false
			post.bookmarkCount = originalCount - 1
		} else {
			post.viewer.bookmarked = true
			post.bookmarkCount = originalCount + 1
		}

		try {
			const rpc = auth.getRpc()
			if (originalBookmarked) {
				const res = await rpc.post('app.bsky.bookmark.deleteBookmark', {
					input: {
						uri: uri,
					},
					as: null,
				})
			} else {
				const res = await rpc.post('app.bsky.bookmark.createBookmark', {
					input: {
						cid: cid,
						uri: uri,
					},
					as: null,
				})
			}
		} catch (err) {
			console.error('Failed to toggle bookmark', err)
			const storedPost = posts.value.get(uri)
			if (storedPost && storedPost.viewer) {
				storedPost.viewer.bookmarked = originalBookmarked
				storedPost.bookmarkCount = originalCount
			}
		}
	}

	async function toggleRepost(post: PostView) {
		if (!auth.isAuthenticated) return

		const uri = post.uri
		const cid = post.cid

		const originalRepost = post.viewer?.repost
		const originalCount = post.repostCount || 0

		if (!post.viewer) post.viewer = {}

		if (originalRepost) {
			post.viewer.repost = undefined
			post.repostCount = originalCount - 1
		} else {
			post.viewer.repost = 'at://did:plc:pending/repost'
			post.repostCount = originalCount + 1
		}

		try {
			const rpc = auth.getRpc()
			if (originalRepost) {
				await ok(
					rpc.post('com.atproto.repo.deleteRecord', {
						input: {
							collection: 'app.bsky.feed.repost',
							repo: auth.session!.info.sub,
							rkey: originalRepost.split('/').pop()!,
						},
					}),
				)
			} else {
				const data = ok(
					await rpc.post('com.atproto.repo.createRecord', {
						input: {
							collection: 'app.bsky.feed.repost',
							repo: auth.session!.info.sub,
							record: {
								$type: 'app.bsky.feed.repost',
								subject: { uri, cid },
								createdAt: new Date().toISOString(),
							},
						},
					}),
				)
				const storedPost = posts.value.get(uri)
				if (storedPost && storedPost.viewer) {
					storedPost.viewer.repost = data.uri
				}
			}
		} catch (err) {
			console.error('Failed to toggle repost', err)
			const storedPost = posts.value.get(uri)
			if (storedPost && storedPost.viewer) {
				storedPost.viewer.repost = originalRepost
				storedPost.repostCount = originalCount
			}
		}
	}

	async function createPost(args: {
		text: string
		embeds?: AppBskyFeedPost.Main['embed']
		reply?: {
			parent: ComAtprotoRepoStrongRef.Main
			root: ComAtprotoRepoStrongRef.Main
		}
	}) {
		const { reply, text, embeds } = args
		if (!auth.isAuthenticated || !auth.session) throw new Error('Not authenticated')

		const rpc = auth.getRpc()
		const record: AppBskyFeedPost.Main = {
			$type: 'app.bsky.feed.post',
			text,
			createdAt: new Date().toISOString(),
			embed: embeds,
			reply: reply,
		}

		const data = await ok(
			rpc.post('com.atproto.repo.createRecord', {
				input: {
					collection: 'app.bsky.feed.post',
					repo: auth.session.info.sub,
					record,
				},
			}),
		)

		return data
	}

	return {
		posts,
		mergePost,
		createPost,

		toggleLike,
		toggleBookmark,
		toggleRepost,
	}
})