import { root } from '@repo/core'
import {
    TemplateGenerationController,
    type ListTemplateGenerationsInput,
    type ListTemplateGenerationsResult,
    type TemplateGeneration,
} from '@repo/sdk'
import { useCallback, useRef, useState } from 'react'

import { type ApiError } from '@/lib/types'

import { handleError } from './use-error'


export const useTemplateGenerations = () => {
    const [loading, setLoading] = useState(false)
    const [loadingMore, setLoadingMore] = useState(false)
    const [error, setError] = useState<ApiError | null>(null)
    const [data, setData] = useState<ListTemplateGenerationsResult | undefined>()
    const currentPageRef = useRef(1)
    const hasMoreRef = useRef(true)

    const execute = useCallback(async (params?: ListTemplateGenerationsInput) => {
        setLoading(true)
        setError(null)
        currentPageRef.current = params?.page || 1

        const templateGeneration = root.get(TemplateGenerationController)
        const { data, error } = await handleError(
            async () =>
                await templateGeneration.list({
                    page: params?.page || 1,
                    limit: params?.limit || 20,
                    ...params,
                }),
        )
        if (error) {
            setError(error)
            setLoading(false)
            return { data: undefined, error }
        }

        const generations = data?.data || []
        hasMoreRef.current = generations.length >= (params?.limit || 20)
        setData(data)
        setLoading(false)
        return { data, error: null }
    }, [])

    const loadMore = useCallback(
        async (params?: Omit<ListTemplateGenerationsInput, 'page'>) => {
            if (loadingMore || loading || !hasMoreRef.current) return { data: undefined, error: null }

            setLoadingMore(true)
            const nextPage = currentPageRef.current + 1

            const templateGeneration = root.get(TemplateGenerationController)
            const { data: newData, error } = await handleError(
                async () =>
                    await templateGeneration.list({
                        page: nextPage,
                        limit: params?.limit || 20,
                        ...params,
                    }),
            )

            if (error) {
                setLoadingMore(false)
                return { data: undefined, error }
            }

            const newGenerations = newData?.data || []
            hasMoreRef.current = newGenerations.length >= (params?.limit || 20)
            currentPageRef.current = nextPage

            setData((prev) => ({
                ...newData,
                data: [...(prev?.data || []), ...newGenerations],
            }))
            setLoadingMore(false)
            return { data: newData, error: null }
        },
        [loading, loadingMore],
    )

    const refetch = useCallback(
        (params?: ListTemplateGenerationsInput) => {
            hasMoreRef.current = true
            return execute(params)
        },
        [execute],
    )

    return {
        data,
        generations: data?.data || [],
        loading,
        loadingMore,
        error,
        execute,
        refetch,
        loadMore,
        hasMore: hasMoreRef.current,
    }
}

export type { TemplateGeneration }

