'use client'

import { useQueryClient, useMutation, useQuery } from '@tanstack/react-query'
import { queryKeys } from '@/lib/query-keys'
import {
  BrainstormQuotaError,
  type BrainstormQuotaPayload,
} from '@/lib/brainstorm-quota-client'
import type { BrainstormSession, BrainstormSessionListItem } from '@/types/brainstorm'

function parseBrainstormQuota(res: Response, data: BrainstormQuotaPayload & Record<string, unknown>) {
  if (res.status === 402 && data?.error === 'QUOTA_EXCEEDED') {
    throw new BrainstormQuotaError(data, 'QUOTA_EXCEEDED')
  }
}

/** i18n key for host-pays quota toasts (Story 3.4). */
export function brainstormQuotaMessageKey(err: unknown): string | null {
  if (err instanceof BrainstormQuotaError) {
    return err.isGuestActor ? 'brainstorm.quotaGuest' : 'brainstorm.quotaHost'
  }
  return null
}

export interface CreateBrainstormResult {
  session: BrainstormSession
  contextSummary?: {
    support: number
    tension: number
    extension: number
  }
}

export function useBrainstormSessions() {
  return useQuery({
    queryKey: queryKeys.brainstormSessions(),
    queryFn: async (): Promise<BrainstormSessionListItem[]> => {
      const res = await fetch('/api/brainstorm', { credentials: 'include' })
      const data = await res.json()
      return data.data || []
    },
  })
}

export function useSharedBrainstormSessions() {
  return useQuery({
    queryKey: queryKeys.brainstormSharedSessions(),
    queryFn: async (): Promise<BrainstormSessionListItem[]> => {
      const res = await fetch('/api/brainstorm/shared', { credentials: 'include' })
      const data = await res.json()
      return data.data || []
    },
  })
}

export interface BrainstormSessionMeta {
  role: 'owner' | 'editor' | 'viewer' | 'guest' | 'none'
  canEdit: boolean
}

export interface BrainstormSessionResult {
  session: BrainstormSession
  meta?: BrainstormSessionMeta
}

export function useBrainstormSession(sessionId: string | null) {
  return useQuery({
    queryKey: queryKeys.brainstormSession(sessionId || ''),
    queryFn: async (): Promise<BrainstormSessionResult | null> => {
      if (!sessionId) return null
      const res = await fetch(`/api/brainstorm/${sessionId}`, { credentials: 'include' })
      const data = await res.json()
      if (!data.data) return null
      return {
        session: data.data,
        meta: data._meta || undefined,
      }
    },
    enabled: !!sessionId,
  })
}

export function useCreateBrainstorm() {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (input: {
      seedIdea: string
      sourceNoteId?: string
      contextNoteIds?: string[]
      locale?: string
    }): Promise<CreateBrainstormResult> => {
      const res = await fetch('/api/brainstorm', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify(input),
      })
      const data = await res.json()
      parseBrainstormQuota(res, data)
      if (!data.success) throw new Error(data.error || 'Failed to create brainstorm')
      return { session: data.data, contextSummary: data.contextSummary }
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useExpandIdea(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (input: { ideaId: string; locale?: string }): Promise<BrainstormSession> => {
      const res = await fetch(`/api/brainstorm/${sessionId}/expand`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify(input),
      })
      const data = await res.json()
      parseBrainstormQuota(res, data)
      if (!data.success) throw new Error(data.error || 'Failed to expand idea')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useDismissIdea(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (ideaId: string) => {
      const res = await fetch(`/api/brainstorm/${sessionId}/dismiss`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ ideaId }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to dismiss idea')
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
    },
  })
}

export function useConvertIdea(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (ideaId: string) => {
      const res = await fetch(`/api/brainstorm/${sessionId}/convert`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ ideaId }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to convert idea')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useExportBrainstorm(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async () => {
      const res = await fetch(`/api/brainstorm/${sessionId}/export`, {
        method: 'POST',
        credentials: 'include',
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to export brainstorm')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useFinalizeBrainstorm(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async () => {
      const res = await fetch(`/api/brainstorm/${sessionId}/finalize`, {
        method: 'POST',
        credentials: 'include',
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to finalize brainstorm')
      return data.impact
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useDeleteBrainstorm() {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (sessionId: string) => {
      const res = await fetch(`/api/brainstorm/${sessionId}`, {
        method: 'DELETE',
        credentials: 'include',
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to delete brainstorm')
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useInviteParticipant(sessionId: string) {
  return useMutation({
    mutationFn: async (input: { role: 'editor' | 'viewer'; expiresInHours?: number; email?: string }) => {
      const res = await fetch(`/api/brainstorm/${sessionId}/invite`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify(input),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to create invite')
      return data
    },
  })
}

export function useJoinBrainstorm() {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (token: string) => {
      const res = await fetch(`/api/brainstorm/join`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ token }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to join')
      return data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}

export function useAddManualIdea(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (input: { title: string; description?: string; parentIdeaId?: string; locale?: string }) => {
      const res = await fetch(`/api/brainstorm/${sessionId}/manual-idea`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify(input),
      })
      const data = await res.json()
      parseBrainstormQuota(res, data)
      if (!data.success) throw new Error(data.error || 'Failed to add idea')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
    },
  })
}

export function useBrainstormActivity(sessionId: string | null) {
  return useQuery({
    queryKey: ['brainstorm', 'activity', sessionId],
    queryFn: async () => {
      if (!sessionId) return []
      const res = await fetch(`/api/brainstorm/${sessionId}/activity`, { credentials: 'include' })
      const data = await res.json()
      return data.data || []
    },
    enabled: !!sessionId,
    refetchInterval: 10000,
  })
}

export function useUpdateBrainstormSettings(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (input: { isPublic?: boolean; guestCanEdit?: boolean }) => {
      const res = await fetch(`/api/brainstorm/${sessionId}`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify(input),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to update settings')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
    },
  })
}

export function useBrainstormSnapshots(sessionId: string | null) {
  return useQuery({
    queryKey: ['brainstorm', 'snapshots', sessionId],
    queryFn: async () => {
      if (!sessionId) return []
      const res = await fetch(`/api/brainstorm/${sessionId}/snapshots`, { credentials: 'include' })
      const data = await res.json()
      return data.data || []
    },
    enabled: !!sessionId,
  })
}

export function useStarIdea(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (ideaId: string) => {
      const res = await fetch(`/api/brainstorm/${sessionId}/star`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ ideaId }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to star idea')
      return data.data as { ideaId: string; isStarred: boolean }
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
    },
  })
}

export function useSummarizeBrainstorm(sessionId: string) {
  return useMutation({
    mutationFn: async (locale?: string): Promise<string> => {
      const res = await fetch(`/api/brainstorm/${sessionId}/summarize`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ locale }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to summarize')
      return data.data.summary as string
    },
  })
}

export function useRenameBrainstormSession(sessionId: string) {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: async (seedIdea: string) => {
      const res = await fetch(`/api/brainstorm/${sessionId}`, {
        method: 'PATCH',
        headers: { 'Content-Type': 'application/json' },
        credentials: 'include',
        body: JSON.stringify({ seedIdea }),
      })
      const data = await res.json()
      if (!data.success) throw new Error(data.error || 'Failed to rename session')
      return data.data
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSession(sessionId) })
      queryClient.invalidateQueries({ queryKey: queryKeys.brainstormSessions() })
    },
  })
}