import * as React from 'react'
import { AlertCircle, Bot, CheckCircle2, Lightbulb, Send } from 'lucide-react'

import { AppField } from '@/components/app/AppField'
import { AppPage } from '@/components/app/AppPage'
import { AppPageHeader } from '@/components/app/AppPageHeader'
import { AppSection } from '@/components/app/AppSection'
import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
import { Badge } from '@/components/ui/badge'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Select, SelectContent, SelectGroup, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { Textarea } from '@/components/ui/textarea'

import { createTicket } from './api'
import type { TicketInput } from './types'

const initialForm: TicketInput = {
  title: '',
  description: '',
  priority: 'medium',
  impact_scope: '',
  environment: '',
  related_system: ''
}

export function TicketCreatePage() {
  const [form, setForm] = React.useState<TicketInput>(initialForm)
  const [error, setError] = React.useState('')
  const [submitting, setSubmitting] = React.useState(false)

  function updateField<Key extends keyof TicketInput>(field: Key, value: TicketInput[Key]) {
    setForm((current) => ({ ...current, [field]: value }))
  }

  async function handleSubmit(event: React.FormEvent) {
    event.preventDefault()
    setError('')
    setSubmitting(true)
    try {
      const ticket = await createTicket(form)
      window.location.hash = `/tickets/${ticket.id}`
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : '创建工单失败，请检查必填信息或稍后重试。')
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <AppPage maxWidth="6xl" contentClassName="grid gap-5">
        <AppPageHeader title="创建工单" />
        <form className="grid gap-4 xl:grid-cols-[minmax(0,1fr)_340px]" onSubmit={handleSubmit}>
          <div className="grid gap-4">
            {error ? (
              <Alert variant="destructive">
                <AlertCircle className="size-4" />
                <AlertTitle>创建工单失败</AlertTitle>
                <AlertDescription>{error}</AlertDescription>
              </Alert>
            ) : null}

            <AppSection title="基础信息">
              <AppField label="工单标题" htmlFor="ticket-title" required>
                <Input
                  id="ticket-title"
                  required
                  placeholder="例如：生产环境登录后跳转失败"
                  value={form.title}
                  onChange={(event) => updateField('title', event.target.value)}
                />
              </AppField>
            </AppSection>

            <AppSection title="影响与优先级">
              <div className="grid gap-4 md:grid-cols-2">
                <AppField label="优先级" required>
                  <Select value={form.priority} onValueChange={(value) => updateField('priority', value as TicketInput['priority'])}>
                    <SelectTrigger className="w-full">
                      <SelectValue placeholder="请选择优先级" />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectGroup>
                        <SelectItem value="low">低</SelectItem>
                        <SelectItem value="medium">中</SelectItem>
                        <SelectItem value="high">高</SelectItem>
                        <SelectItem value="urgent">紧急</SelectItem>
                      </SelectGroup>
                    </SelectContent>
                  </Select>
                </AppField>
                <AppField label="影响范围" htmlFor="ticket-impact-scope">
                  <Input
                    id="ticket-impact-scope"
                    placeholder="例如：单个用户、某部门、全部用户"
                    value={form.impact_scope}
                    onChange={(event) => updateField('impact_scope', event.target.value)}
                  />
                </AppField>
              </div>
            </AppSection>

            <AppSection title="环境与系统">
              <div className="grid gap-4 md:grid-cols-2">
                <AppField label="关联系统" htmlFor="ticket-related-system">
                  <Input
                    id="ticket-related-system"
                    placeholder="例如：CRM、财务系统、数据中台"
                    value={form.related_system}
                    onChange={(event) => updateField('related_system', event.target.value)}
                  />
                </AppField>
                <AppField label="运行环境" htmlFor="ticket-environment">
                  <Input
                    id="ticket-environment"
                    placeholder="例如：生产环境、测试环境、Windows 终端"
                    value={form.environment}
                    onChange={(event) => updateField('environment', event.target.value)}
                  />
                </AppField>
              </div>
            </AppSection>

            <AppSection title="问题描述">
              <AppField label="详细描述" htmlFor="ticket-description" required>
                <Textarea
                  id="ticket-description"
                  required
                  placeholder="请描述影响范围、报错信息、操作步骤和已尝试的处理方式。"
                  value={form.description}
                  onChange={(event) => updateField('description', event.target.value)}
                />
              </AppField>
            </AppSection>

            <AppSection title="提交确认">
              <div className="flex flex-col gap-3 md:flex-row md:items-center md:justify-between">
                <div className="flex items-start gap-2 text-sm text-muted-foreground">
                  <CheckCircle2 className="mt-0.5 size-4" />
                  <span>请确认标题和问题描述已足够支持技术人员开始排查。</span>
                </div>
                <Button type="submit" disabled={submitting}>
                  <Send data-icon="inline-start" />
                  {submitting ? '提交中...' : '提交工单'}
                </Button>
              </div>
            </AppSection>
          </div>

          <div className="grid content-start gap-4">
            <AppSection title="建单提示">
              <div className="grid gap-3 text-sm text-muted-foreground">
                <div className="flex gap-2">
                  <Lightbulb className="mt-0.5 size-4" />
                  <span>标题建议包含系统、场景和异常现象。</span>
                </div>
                <div className="flex gap-2">
                  <Lightbulb className="mt-0.5 size-4" />
                  <span>描述中写清楚复现步骤、报错信息和影响范围。</span>
                </div>
                <div className="flex gap-2">
                  <Lightbulb className="mt-0.5 size-4" />
                  <span>紧急优先级应只用于阻断生产或大范围影响问题。</span>
                </div>
              </div>
            </AppSection>

            <AppSection
              title="AI 建单辅助"
              action={<Badge variant="ai">即将接入</Badge>}
            >
              <p className="text-sm text-muted-foreground">
                后续阶段将接入建单 Agent，用于补全字段、追问缺失信息和推荐相似问题。
              </p>
            </AppSection>
          </div>
        </form>
    </AppPage>
  )
}