import {useEffect, useState} from 'react'
import {CalendarClock, Loader2, Plus, Trash2} from 'lucide-react'
import {useMutation, useQuery, useQueryClient} from '@tanstack/react-query'
import {createEventBridgeLambdaTrigger, deleteEventBridgeLambdaTrigger, listEventBridgeLambdaTriggers, type EventBridgeLambdaTriggerOverview} from '@/api/cloudProxyClient'
import type {CloudProvider} from '@/types/cloud'
import type {CloudResource} from '@/types/resource'
import {ServiceIcon} from '@/components/serviceIcons'

interface ScheduledLambdaTriggerPanelProps {
    cloud: CloudProvider
    resource?: CloudResource
    runtimeReachable: boolean
}

export function ScheduledLambdaTriggerPanel({cloud, resource, runtimeReachable}: ScheduledLambdaTriggerPanelProps) {
    const [ruleName, setRuleName] = useState('')
    const [scheduleExpression, setScheduleExpression] = useState('rate(5 minutes)')
    const [deleteTarget, setDeleteTarget] = useState<EventBridgeLambdaTriggerOverview | null>(null)
    const queryClient = useQueryClient()
    const triggersQuery = useQuery({
        queryKey: ['eventbridge-lambda-triggers', cloud, resource?.id],
        queryFn: ({signal}) => listEventBridgeLambdaTriggers(cloud, resource!.name, signal),
        enabled: cloud === 'aws' && Boolean(resource) && runtimeReachable,
    })

    useEffect(() => {
        setRuleName('')
        setScheduleExpression('rate(5 minutes)')
        setDeleteTarget(null)
    }, [resource?.id])

    const createMutation = useMutation({
        mutationFn: () => createEventBridgeLambdaTrigger(cloud, resource!.name, {ruleName, scheduleExpression}),
        onSuccess: () => {
            setRuleName('')
            queryClient.invalidateQueries({queryKey: ['eventbridge-lambda-triggers', cloud, resource?.id]})
        },
    })
    const deleteMutation = useMutation({
        mutationFn: (trigger: EventBridgeLambdaTriggerOverview) => deleteEventBridgeLambdaTrigger(cloud, resource!.name, trigger.id),
        onSuccess: () => {
            setDeleteTarget(null)
            queryClient.invalidateQueries({queryKey: ['eventbridge-lambda-triggers', cloud, resource?.id]})
        },
    })

    if (!resource || resource.service !== 'serverless' || resource.type !== 'lambda') return null
    const canCreate = Boolean(ruleName.trim() && scheduleExpression.trim()) && !createMutation.isPending

    return <section className="table-panel">
        <div className="dynamic-stage-header">
            <div>
                <p className="eyebrow">Schedule</p>
                <h3><CalendarClock size={15}/> Add scheduled trigger</h3>
                <p className="muted compact-text">Invoke <code>{resource.name}</code> on an EventBridge schedule.</p>
            </div>
        </div>
        <div className="resource-create-inline">
            <form className="inspector-action-form apigateway-route-form" onSubmit={(event) => {
                event.preventDefault()
                if (canCreate) createMutation.mutate()
            }}>
                <label className="dynamic-field">
                    <span>Rule name</span>
                    <input className="input" value={ruleName} onChange={(event) => setRuleName(event.target.value)} placeholder="hourly-report" required/>
                    <small>A unique EventBridge rule name.</small>
                </label>
                <label className="dynamic-field">
                    <span>Schedule expression</span>
                    <input className="input" value={scheduleExpression} onChange={(event) => setScheduleExpression(event.target.value)} placeholder="rate(5 minutes)" required/>
                    <small>Use a rate or cron expression, for example <code>rate(1 hour)</code>.</small>
                </label>
                <button className="button primary apigateway-route-submit" type="submit" disabled={!canCreate}>
                    {createMutation.isPending ? <Loader2 size={13}/> : <Plus size={13}/>}
                    {createMutation.isPending ? 'Adding schedule' : 'Add schedule'}
                </button>
            </form>
            {createMutation.isError && <p className="error-text compact-text">{createMutation.error instanceof Error ? createMutation.error.message : 'Unable to add scheduled trigger.'}</p>}
        </div>
        <div className="apigateway-route-explorer">
            <div className="dynamic-stage-header"><div><p className="eyebrow">Configured Schedules</p><h3><ServiceIcon cloud="aws" iconKey="events" size={18}/> EventBridge rules</h3></div></div>
            {triggersQuery.isLoading && <p className="muted compact-text">Loading scheduled triggers...</p>}
            {triggersQuery.isError && <p className="error-text compact-text">{triggersQuery.error instanceof Error ? triggersQuery.error.message : 'Unable to load scheduled triggers.'}</p>}
            {triggersQuery.data?.length === 0 && <p className="muted compact-text">No scheduled triggers configured for this Lambda.</p>}
            {triggersQuery.data?.map((trigger) => <div className="apigateway-route-item" key={trigger.id}>
                <div className="apigateway-route-select"><span className="apigateway-route-method">RULE</span><code>{trigger.ruleName}</code><small>{trigger.scheduleExpression}{trigger.state ? ` · ${trigger.state}` : ''}</small></div>
                {deleteTarget?.id === trigger.id ? <div className="apigateway-route-confirm"><span>Remove schedule?</span><button className="button danger compact" type="button" disabled={deleteMutation.isPending} onClick={() => deleteMutation.mutate(trigger)}>Remove</button><button className="button compact" type="button" disabled={deleteMutation.isPending} onClick={() => setDeleteTarget(null)}>Cancel</button></div> : <button className="icon-btn" type="button" aria-label={`Remove schedule ${trigger.ruleName}`} onClick={() => setDeleteTarget(trigger)}><Trash2 size={13}/></button>}
            </div>)}
        </div>
    </section>
}