'use client'

import { useCallback, useEffect, useState } from 'react'
import type { NotebookSchemaPayload, NotePropertyValues } from '@/lib/structured-views/types'

type SchemaState = {
  schema: NotebookSchemaPayload | null
  noteValues: Record<string, NotePropertyValues>
  loading: boolean
  error: string | null
}

export function useNotebookSchema(notebookId: string | null | undefined) {
  const [state, setState] = useState<SchemaState>({
    schema: null,
    noteValues: {},
    loading: false,
    error: null,
  })

  const reload = useCallback(async () => {
    if (!notebookId) {
      setState({ schema: null, noteValues: {}, loading: false, error: null })
      return
    }
    setState((s) => ({ ...s, loading: true, error: null }))
    try {
      const res = await fetch(`/api/notebooks/${notebookId}/schema`)
      const json = await res.json()
      if (!res.ok || !json.success) {
        throw new Error(json.error || 'Failed to load schema')
      }
      setState({
        schema: json.data.schema,
        noteValues: json.data.noteValues ?? {},
        loading: false,
        error: null,
      })
    } catch (e) {
      setState((s) => ({
        ...s,
        loading: false,
        error: e instanceof Error ? e.message : 'Error',
      }))
    }
  }, [notebookId])

  useEffect(() => {
    void reload()
  }, [reload])

  const enableStructuredMode = useCallback(async () => {
    if (!notebookId) return null
    const res = await fetch(`/api/notebooks/${notebookId}/schema`, { method: 'POST' })
    const json = await res.json()
    if (!res.ok || !json.success) throw new Error(json.error || 'Failed')
    await reload()
    return json.data.schema as NotebookSchemaPayload
  }, [notebookId, reload])

  const disableStructuredMode = useCallback(async () => {
    if (!notebookId) return
    const res = await fetch(`/api/notebooks/${notebookId}/schema`, {
      method: 'PATCH',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ action: 'disable' }),
    })
    const json = await res.json()
    if (!res.ok || !json.success) throw new Error(json.error || 'Failed')
    await reload()
  }, [notebookId, reload])

  const addProperty = useCallback(
    async (name: string, type: string, options?: string[]) => {
      if (!notebookId) return null
      const res = await fetch(`/api/notebooks/${notebookId}/schema`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ action: 'addProperty', name, type, options }),
      })
      const json = await res.json()
      if (!res.ok || !json.success) throw new Error(json.error || 'Failed')
      await reload()
      return json.data.schema as NotebookSchemaPayload
    },
    [notebookId, reload],
  )

  const deleteProperty = useCallback(
    async (propertyId: string) => {
      if (!notebookId) return
      const res = await fetch(`/api/notebooks/${notebookId}/schema`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ action: 'deleteProperty', propertyId }),
      })
      const json = await res.json()
      if (!res.ok || !json.success) throw new Error(json.error || 'Failed')
      await reload()
    },
    [notebookId, reload],
  )

  const setKanbanGroupProperty = useCallback(
    async (propertyId: string | null) => {
      if (!notebookId) return
      const res = await fetch(`/api/notebooks/${notebookId}/schema`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ action: 'updateViewSettings', kanbanGroupPropertyId: propertyId }),
      })
      const json = await res.json()
      if (!res.ok || !json.success) throw new Error(json.error || 'Failed')
      await reload()
    },
    [notebookId, reload],
  )

  const patchNoteValuesLocal = useCallback((noteId: string, patch: NotePropertyValues) => {
    setState((s) => ({
      ...s,
      noteValues: {
        ...s.noteValues,
        [noteId]: { ...(s.noteValues[noteId] ?? {}), ...patch },
      },
    }))
  }, [])

  return {
    ...state,
    reload,
    enableStructuredMode,
    disableStructuredMode,
    addProperty,
    deleteProperty,
    setKanbanGroupProperty,
    patchNoteValuesLocal,
  }
}