import { debounce, memoize } from 'lodash'
import { useMemo } from 'react'
import { proxy, snapshot, subscribe, useSnapshot } from 'valtio'
import { devtools, proxySet } from 'valtio/utils'

import { upsertContent, UpsertContentPayload } from 'data/content/content-upsert-mutation'
import type { SqlSnippet } from 'data/content/sql-snippets-query'
import type { SqlSnippets } from 'types'

export type StateSnippet = {
  snippet: SqlSnippet
  splitSizes: number[]
  projectRef: string
}

export const sqlEditorState = proxy({
  snippets: {} as {
    [key: string]: StateSnippet
  },
  results: {} as {
    [key: string]: {
      rows: any[]
      error?: any
    }[]
  },
  // Project ref as the key, ids of each snippet as the order
  orders: {} as {
    [key: string]: string[]
  },
  loaded: {} as {
    [key: string]: boolean
  },

  needsSaving: proxySet<string>([]),
  savingStates: {} as {
    [key: string]: 'IDLE' | 'UPDATING' | 'UPDATING_FAILED'
  },

  orderSnippets: (snippets: SqlSnippet[]) => {
    return (
      snippets
        .filter((s) => Boolean(s.id))
        // first alphabetical
        .sort((a, b) => a.name?.localeCompare(b.name))
    )
  },
  reorderSnippets: (projectRef: string) => {
    sqlEditorState.orders[projectRef] = sqlEditorState
      .orderSnippets(
        sqlEditorState.orders[projectRef].map((id) => sqlEditorState.snippets[id].snippet)
      )
      .map((s) => s.id!)
  },

  setRemoteSnippets: (snippets: SqlSnippet[], projectRef: string) => {
    if (!sqlEditorState.orders[projectRef]) {
      const orderedSnippets = sqlEditorState.orderSnippets(snippets)

      sqlEditorState.orders[projectRef] = orderedSnippets.map((s) => s.id!)
    }

    snippets.forEach((snippet) => {
      sqlEditorState.addSnippet(snippet, projectRef)
    })
  },
  addSnippet: (snippet: SqlSnippet, projectRef: string) => {
    if (snippet.id && !sqlEditorState.snippets[snippet.id]) {
      sqlEditorState.snippets[snippet.id] = {
        snippet,
        splitSizes: [50, 50],
        projectRef,
      }
      sqlEditorState.results[snippet.id] = []
      sqlEditorState.savingStates[snippet.id] = 'IDLE'
      if (
        sqlEditorState.orders[projectRef] !== undefined &&
        !sqlEditorState.orders[projectRef].includes(snippet.id)
      ) {
        sqlEditorState.orders[projectRef].unshift(snippet.id)
        sqlEditorState.reorderSnippets(projectRef)
      }
    }
    sqlEditorState.loaded[projectRef] = true
  },
  removeSnippet: (id: string) => {
    const { [id]: snippet, ...otherSnippets } = sqlEditorState.snippets
    sqlEditorState.snippets = otherSnippets

    const { [id]: result, ...otherResults } = sqlEditorState.results
    sqlEditorState.results = otherResults

    sqlEditorState.orders[snippet.projectRef] = sqlEditorState.orders[snippet.projectRef].filter(
      (s) => s !== id
    )

    sqlEditorState.needsSaving.delete(id)
  },
  updateSnippet: (id: string, snippet: SqlSnippet) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].snippet = snippet
      sqlEditorState.needsSaving.add(id)
    }
  },
  setSplitSizes: (id: string, splitSizes: number[]) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].splitSizes = splitSizes
    }
  },
  collapseUtilityPanel: (id: string) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].splitSizes = [100, 0]
    }
  },
  restoreUtilityPanel: (id: string) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].splitSizes = [50, 50]
    }
  },
  setSql: (id: string, sql: string) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].snippet.content.sql = sql
      sqlEditorState.needsSaving.add(id)
    }
  },
  renameSnippet: (id: string, name: string, description?: string) => {
    if (sqlEditorState.snippets[id]) {
      const { snippet, projectRef } = sqlEditorState.snippets[id]

      snippet.name = name
      snippet.description = description

      sqlEditorState.reorderSnippets(projectRef)
      sqlEditorState.needsSaving.add(id)
    }
  },
  shareSnippet: (id: string, visibility: 'user' | 'project' | 'org' | 'public') => {
    if (sqlEditorState.snippets[id]) {
      const { snippet, projectRef } = sqlEditorState.snippets[id]

      snippet.visibility = visibility

      sqlEditorState.reorderSnippets(projectRef)
      sqlEditorState.needsSaving.add(id)
    }
  },
  addNeedsSaving: (id: string) => {
    sqlEditorState.needsSaving.add(id)
  },
  resetResult: (id: string) => {
    if (sqlEditorState.results[id]) {
      sqlEditorState.results[id] = []
    }
  },
  addResult: (id: string, results: any[]) => {
    if (sqlEditorState.results[id]) {
      sqlEditorState.results[id].unshift({ rows: results })
    }
  },
  addResultError: (id: string, error: any) => {
    if (sqlEditorState.results[id]) {
      sqlEditorState.results[id].unshift({ rows: [], error })
    }
  },
  addFavorite: (id: string) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].snippet.content.favorite = true
      sqlEditorState.needsSaving.add(id)
    }
  },
  removeFavorite: (id: string) => {
    if (sqlEditorState.snippets[id]) {
      sqlEditorState.snippets[id].snippet.content.favorite = false
      sqlEditorState.needsSaving.add(id)
    }
  },
})

export const getSqlEditorStateSnapshot = () => snapshot(sqlEditorState)

export const useSqlEditorStateSnapshot = (options?: Parameters<typeof useSnapshot>[1]) =>
  useSnapshot(sqlEditorState, options)

export const useSnippets = (projectRef: string | undefined) => {
  const snapshot = useSqlEditorStateSnapshot()

  return useMemo(() => {
    return projectRef
      ? snapshot.orders[projectRef]?.map((id) => snapshot.snippets[id].snippet) ?? []
      : []
  }, [projectRef, snapshot.orders, snapshot.snippets])
}

async function upsert(id: string, projectRef: string, payload: UpsertContentPayload) {
  try {
    sqlEditorState.savingStates[id] = 'UPDATING'
    await upsertContent({
      projectRef,
      payload,
    })
    sqlEditorState.savingStates[id] = 'IDLE'
  } catch (error) {
    sqlEditorState.savingStates[id] = 'UPDATING_FAILED'
  }
}

const memoizedUpdate = memoize((_id: string) => debounce(upsert, 1000))
const debouncedUpdate = (id: string, projectRef: string, payload: UpsertContentPayload) =>
  memoizedUpdate(id)(id, projectRef, payload)

if (typeof window !== 'undefined') {
  devtools(sqlEditorState, {
    name: 'sqlEditorState',
    // [Joshen] So that jest unit tests can ignore this
    enabled: process.env.NEXT_PUBLIC_ENVIRONMENT !== undefined,
  })

  subscribe(sqlEditorState.needsSaving, () => {
    const state = getSqlEditorStateSnapshot()

    Array.from(state.needsSaving).forEach((id) => {
      const snippet = state.snippets[id]

      if (snippet) {
        debouncedUpdate(id, snippet.projectRef, {
          ...snippet.snippet,
          name: snippet.snippet.name ?? 'Untitled',
          description: snippet.snippet.description ?? '',
          visibility: snippet.snippet.visibility ?? 'user',
          project_id: snippet.snippet.project_id ?? 0,
          content: { ...snippet.snippet.content, content_id: id } as SqlSnippets.Content,
          type: 'sql',
          id,
        })

        sqlEditorState.needsSaving.delete(id)
      }
    })
  })
}