'use client'

/**
 * Agents Page Client
 * Main client component for the agents page.
 */

import { useState, useCallback, useMemo } from 'react'
import { Plus, Bot, LifeBuoy, Search } from 'lucide-react'
import { toast } from 'sonner'
import { useLanguage } from '@/lib/i18n'

import { AgentCard } from '@/components/agents/agent-card'
import { AgentForm } from '@/components/agents/agent-form'
import { AgentTemplates } from '@/components/agents/agent-templates'
import { AgentRunLog } from '@/components/agents/agent-run-log'
import { AgentHelp } from '@/components/agents/agent-help'
import {
  createAgent,
  updateAgent,
  getAgents,
} from '@/app/actions/agent-actions'

// --- Types ---

interface Notebook {
  id: string
  name: string
  icon?: string | null
}

interface AgentItem {
  id: string
  name: string
  description?: string | null
  type?: string | null
  role: string
  sourceUrls?: string | null
  sourceNotebookId?: string | null
  targetNotebookId?: string | null
  frequency: string
  isEnabled: boolean
  lastRun: string | Date | null
  createdAt: string | Date
  updatedAt: string | Date
  tools?: string | null
  maxSteps?: number
  notifyEmail?: boolean
  _count: { actions: number }
  actions: { id: string; status: string; createdAt: string | Date }[]
  notebook?: { id: string; name: string; icon?: string | null } | null
}

interface AgentsPageClientProps {
  agents: AgentItem[]
  notebooks: Notebook[]
}

const typeFilterOptions = [
  { value: '', labelKey: 'agents.filterAll' },
  { value: 'scraper', labelKey: 'agents.types.scraper' },
  { value: 'researcher', labelKey: 'agents.types.researcher' },
  { value: 'monitor', labelKey: 'agents.types.monitor' },
  { value: 'custom', labelKey: 'agents.types.custom' },
] as const

// --- Component ---

export function AgentsPageClient({
  agents: initialAgents,
  notebooks,
}: AgentsPageClientProps) {
  const { t } = useLanguage()
  const [agents, setAgents] = useState(initialAgents)
  const [showForm, setShowForm] = useState(false)
  const [editingAgent, setEditingAgent] = useState<AgentItem | null>(null)
  const [logAgent, setLogAgent] = useState<{ id: string; name: string } | null>(null)
  const [showHelp, setShowHelp] = useState(false)
  const [searchQuery, setSearchQuery] = useState('')
  const [typeFilter, setTypeFilter] = useState('')

  const refreshAgents = useCallback(async () => {
    try {
      const updated = await getAgents()
      setAgents(updated)
    } catch {
      // Silent
    }
  }, [])

  const handleToggle = useCallback((id: string, isEnabled: boolean) => {
    setAgents(prev => prev.map(a => a.id === id ? { ...a, isEnabled } : a))
  }, [])

  const handleCreate = useCallback(() => {
    setEditingAgent(null)
    setShowForm(true)
  }, [])

  const handleEdit = useCallback((id: string) => {
    const agent = agents.find(a => a.id === id)
    if (agent) {
      setEditingAgent(agent)
      setShowForm(true)
    }
  }, [agents])

  const handleSave = useCallback(async (formData: FormData) => {
    const data = {
      name: formData.get('name') as string,
      description: (formData.get('description') as string) || undefined,
      type: formData.get('type') as string,
      role: formData.get('role') as string,
      sourceUrls: formData.get('sourceUrls') ? JSON.parse(formData.get('sourceUrls') as string) : undefined,
      sourceNotebookId: (formData.get('sourceNotebookId') as string) || undefined,
      targetNotebookId: (formData.get('targetNotebookId') as string) || undefined,
      frequency: formData.get('frequency') as string,
      tools: formData.get('tools') ? JSON.parse(formData.get('tools') as string) : undefined,
      maxSteps: formData.get('maxSteps') ? Number(formData.get('maxSteps')) : undefined,
      notifyEmail: formData.get('notifyEmail') === 'true',
    }

    if (editingAgent) {
      await updateAgent(editingAgent.id, data)
      toast.success(t('agents.toasts.updated'))
    } else {
      await createAgent(data)
      toast.success(t('agents.toasts.created'))
    }

    setShowForm(false)
    setEditingAgent(null)
    await refreshAgents()
  }, [editingAgent, refreshAgents, t])

  const filteredAgents = useMemo(() => {
    return agents.filter(agent => {
      const matchesType = !typeFilter || (agent.type || 'scraper') === typeFilter
      if (!searchQuery.trim()) return matchesType
      const q = searchQuery.toLowerCase()
      const matchesSearch =
        (agent.name || '').toLowerCase().includes(q) ||
        (agent.description && agent.description.toLowerCase().includes(q))
      return matchesType && matchesSearch
    })
  }, [agents, searchQuery, typeFilter])

  const existingAgentNames = useMemo(() => agents.map(a => a.name), [agents])

  return (
    <>
      {/* Header */}
      <div className="flex items-center justify-between gap-4 mb-8">
        <div className="flex items-center gap-4">
          <div className="p-3 bg-primary/10 rounded-2xl shadow-sm border border-primary/20">
            <Bot className="h-8 w-8 text-primary" />
          </div>
          <div>
            <h1 className="text-3xl font-bold tracking-tight">{t('agents.title')}</h1>
            <p className="text-muted-foreground text-sm">{t('agents.subtitle')}</p>
          </div>
        </div>
      </div>

      {/* Action buttons */}
      <div className="flex items-center justify-between mb-6">
        <button
          onClick={() => setShowHelp(true)}
          className="flex items-center gap-2 px-4 py-2 text-sm font-medium text-primary bg-primary/10 border border-primary/20 rounded-lg hover:bg-primary/15 transition-colors"
        >
          <LifeBuoy className="w-4 h-4" />
          {t('agents.help.btnLabel')}
        </button>
        <button
          onClick={handleCreate}
          className="flex items-center gap-2 px-4 py-2 text-sm font-medium text-white bg-primary rounded-lg hover:bg-primary/90 transition-colors"
        >
          <Plus className="w-4 h-4" />
          {t('agents.newAgent')}
        </button>
      </div>

      {/* Agents grid */}
      {agents.length > 0 && (
        <div className="mb-10">
          <h3 className="text-sm font-semibold text-slate-500 uppercase tracking-wider mb-3">
            {t('agents.myAgents')}
          </h3>

          {/* Search and filter */}
          <div className="flex flex-col sm:flex-row items-start sm:items-center gap-3 mb-4">
            <div className="relative flex-1 w-full sm:max-w-xs">
              <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-slate-400" />
              <input
                type="text"
                value={searchQuery}
                onChange={e => setSearchQuery(e.target.value)}
                placeholder={t('agents.searchPlaceholder')}
                className="w-full pl-9 pr-3 py-2 text-sm bg-white border border-slate-200 rounded-lg outline-none focus:border-primary/40 focus:ring-2 focus:ring-primary/10 transition-all"
              />
            </div>
            <div className="flex items-center gap-1.5 flex-wrap">
              {typeFilterOptions.map(opt => (
                <button
                  key={opt.value}
                  onClick={() => setTypeFilter(opt.value)}
                  className={`px-3 py-1.5 text-xs font-medium rounded-full transition-colors ${
                    typeFilter === opt.value
                      ? 'bg-primary text-white'
                      : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
                  }`}
                >
                  {t(opt.labelKey)}
                </button>
              ))}
            </div>
          </div>

          {filteredAgents.length > 0 ? (
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
              {filteredAgents.map(agent => (
                <AgentCard
                  key={agent.id}
                  agent={agent}
                  onEdit={handleEdit}
                  onRefresh={refreshAgents}
                  onToggle={handleToggle}
                />
              ))}
            </div>
          ) : (
            <div className="flex flex-col items-center justify-center py-12 text-center">
              <Search className="w-10 h-10 text-slate-300 mb-3" />
              <p className="text-sm text-slate-400">{t('agents.noResults')}</p>
            </div>
          )}
        </div>
      )}

      {/* Empty state */}
      {agents.length === 0 && (
        <div className="flex flex-col items-center justify-center py-16 text-center mb-10">
          <Bot className="w-16 h-16 text-slate-300 mb-4" />
          <h3 className="text-lg font-medium text-slate-500 mb-2">{t('agents.noAgents')}</h3>
          <p className="text-sm text-slate-400 max-w-sm">
            {t('agents.noAgentsDescription')}
          </p>
        </div>
      )}

      {/* Templates */}
      <AgentTemplates onInstalled={refreshAgents} existingAgentNames={existingAgentNames} />

      {/* Form modal */}
      {showForm && (
        <AgentForm
          agent={editingAgent}
          notebooks={notebooks}
          onSave={handleSave}
          onCancel={() => { setShowForm(false); setEditingAgent(null) }}
        />
      )}

      {/* Run log modal */}
      {logAgent && (
        <AgentRunLog
          agentId={logAgent.id}
          agentName={logAgent.name}
          onClose={() => setLogAgent(null)}
        />
      )}

      {/* Help modal */}
      {showHelp && (
        <AgentHelp onClose={() => setShowHelp(false)} />
      )}
    </>
  )
}