"use client"

import { useEffect, useState, useCallback, useRef } from 'react'
import { initElectric, isElectricInitialized, type ElectricClient, type SyncHandle } from '@/lib/electric/client'
import type { SearchSourceConnector } from '@/contracts/types/connector.types'

export function useConnectorsElectric(searchSpaceId: number | string | null) {
	const [electric, setElectric] = useState<ElectricClient | null>(null)
	const [connectors, setConnectors] = useState<SearchSourceConnector[]>([])
	const [loading, setLoading] = useState(true)
	const [error, setError] = useState<Error | null>(null)
	const syncHandleRef = useRef<SyncHandle | null>(null)
	const liveQueryRef = useRef<{ unsubscribe: () => void } | null>(null)

	// Transform connector data from Electric SQL/PGlite to match expected format
	// Converts Date objects to ISO strings as expected by Zod schema
	function transformConnector(connector: any): SearchSourceConnector {
		return {
			...connector,
			last_indexed_at: connector.last_indexed_at
				? typeof connector.last_indexed_at === 'string'
					? connector.last_indexed_at
					: new Date(connector.last_indexed_at).toISOString()
				: null,
			next_scheduled_at: connector.next_scheduled_at
				? typeof connector.next_scheduled_at === 'string'
					? connector.next_scheduled_at
					: new Date(connector.next_scheduled_at).toISOString()
				: null,
			created_at: connector.created_at
				? typeof connector.created_at === 'string'
					? connector.created_at
					: new Date(connector.created_at).toISOString()
				: new Date().toISOString(), // fallback
		}
	}

	// Initialize Electric SQL and start syncing with real-time updates
	useEffect(() => {
		if (!searchSpaceId) {
			setLoading(false)
			setConnectors([])
			return
		}

		let mounted = true

		async function init() {
			try {
				const electricClient = await initElectric()
				if (!mounted) return

				setElectric(electricClient)

				// Start syncing connectors for this search space via Electric SQL
				console.log('Starting Electric SQL sync for connectors, search_space_id:', searchSpaceId)
				
				// Use numeric format for WHERE clause (PGlite sync plugin expects this format)
				const handle = await electricClient.syncShape({
					table: 'search_source_connectors',
					where: `search_space_id = ${searchSpaceId}`,
					primaryKey: ['id'],
				})
				
				console.log('Electric SQL sync started for connectors:', {
					isUpToDate: handle.isUpToDate,
					hasStream: !!handle.stream,
					hasInitialSyncPromise: !!handle.initialSyncPromise,
				})
				
				// Optimized: Check if already up-to-date before waiting
				if (handle.isUpToDate) {
					console.log('Connectors sync already up-to-date, skipping wait')
				} else if (handle.initialSyncPromise) {
					// Only wait if not already up-to-date
					console.log('Waiting for initial connectors sync to complete...')
					try {
						// Use Promise.race with a shorter timeout to avoid long waits
						await Promise.race([
							handle.initialSyncPromise,
							new Promise(resolve => setTimeout(resolve, 2000)), // Max 2s wait
						])
						console.log('Initial connectors sync promise resolved or timed out, checking status:', {
							isUpToDate: handle.isUpToDate,
						})
					} catch (syncErr) {
						console.error('Initial connectors sync failed:', syncErr)
					}
				}
				
				// Check status after waiting
				console.log('Connectors sync status after waiting:', {
					isUpToDate: handle.isUpToDate,
					hasStream: !!handle.stream,
				})

				if (!mounted) {
					handle.unsubscribe()
					return
				}

				syncHandleRef.current = handle
				setLoading(false)
				setError(null)

				// Fetch connectors after sync is complete (we already waited above)
				await fetchConnectors(electricClient.db)

				// Set up real-time updates using PGlite live queries
				// Electric SQL syncs data to PGlite in real-time via HTTP streaming
				// PGlite live queries detect when the synced data changes and trigger callbacks
				try {
					// eslint-disable-next-line @typescript-eslint/no-explicit-any
					const db = electricClient.db as any
					
					// Use PGlite's live query API for real-time updates
					// CORRECT API: await db.live.query() then use .subscribe()
					if (db.live?.query && typeof db.live.query === 'function') {
						// IMPORTANT: db.live.query() returns a Promise - must await it!
						const liveQuery = await db.live.query(
							`SELECT * FROM search_source_connectors WHERE search_space_id = $1 ORDER BY created_at DESC`,
							[searchSpaceId]
						)
						
						if (!mounted) {
							liveQuery.unsubscribe?.()
							return
						}
						
						// Set initial results immediately from the resolved query
						if (liveQuery.initialResults?.rows) {
							console.log('📋 Initial live query results for connectors:', liveQuery.initialResults.rows.length)
							setConnectors(liveQuery.initialResults.rows.map(transformConnector))
						} else if (liveQuery.rows) {
							// Some versions have rows directly on the result
							console.log('📋 Initial live query results for connectors (direct):', liveQuery.rows.length)
							setConnectors(liveQuery.rows.map(transformConnector))
						}
						
						// Subscribe to changes - this is the correct API!
						// The callback fires automatically when Electric SQL syncs new data to PGlite
						if (typeof liveQuery.subscribe === 'function') {
							liveQuery.subscribe((result: { rows: any[] }) => {
								if (mounted && result.rows) {
									console.log('🔄 Connectors updated via live query:', result.rows.length)
									setConnectors(result.rows.map(transformConnector))
								}
							})
							
							// Store unsubscribe function for cleanup
							liveQueryRef.current = liveQuery
						}
					} else {
						console.warn('PGlite live query API not available, falling back to polling')
					}
				} catch (liveQueryErr) {
					console.error('Failed to set up live query for connectors:', liveQueryErr)
					// Don't fail completely - we still have the initial fetch
				}
			} catch (err) {
				console.error('Failed to initialize Electric SQL for connectors:', err)
				if (mounted) {
					setError(err instanceof Error ? err : new Error('Failed to initialize Electric SQL for connectors'))
					setLoading(false)
				}
			}
		}

		init()

		return () => {
			mounted = false
			syncHandleRef.current?.unsubscribe?.()
			liveQueryRef.current?.unsubscribe?.()
			syncHandleRef.current = null
			liveQueryRef.current = null
		}
	}, [searchSpaceId])

	async function fetchConnectors(db: any) {
		try {
			const result = await db.query(
				`SELECT * FROM search_source_connectors WHERE search_space_id = $1 ORDER BY created_at DESC`,
				[searchSpaceId]
			)
			console.log('📋 Fetched connectors from PGlite:', result.rows?.length || 0)
			setConnectors((result.rows || []).map(transformConnector))
		} catch (err) {
			console.error('Failed to fetch connectors from PGlite:', err)
		}
	}

	// Manual refresh function (optional, for fallback)
	const refreshConnectors = useCallback(async () => {
		if (!electric) return
		await fetchConnectors(electric.db)
	}, [electric])

	return { connectors, loading, error, refreshConnectors }
}