import { useMemo, useState } from 'react'

import { communicationRepository } from '../repositories/communicationRepository.js'

const channels = {
  whatsapp: { label: 'WhatsApp', className: 'bg-emerald-500/20 text-emerald-400', icon: 'message' },
  email: { label: 'E-mail', className: 'bg-blue-500/20 text-blue-400', icon: 'mail' },
  sms: { label: 'SMS', className: 'bg-purple-500/20 text-purple-400', icon: 'phone' },
}

const statusConfig = {
  entregue: { label: 'Entregue', className: 'text-emerald-400', icon: 'check' },
  lida: { label: 'Lida', className: 'text-blue-400', icon: 'eye' },
  falha: { label: 'Falha', className: 'text-red-400', icon: 'x-circle' },
  pendente: { label: 'Pendente', className: 'text-amber-400', icon: 'clock' },
}


const emptyMessage = {
  patient: '',
  channel: 'whatsapp',
  template: 'Lembrete 48h',
  content: '',
}

const emptyTemplate = {
  name: '',
  channel: 'whatsapp',
  category: 'Lembrete',
  content: '',
}

const cardClass = 'rounded-2xl border border-[#404040] bg-[#262626] shadow-sm'
const inputClass =
  'h-10 w-full rounded-sm border border-[#404040] bg-[#171717] px-3 text-sm text-[#e5e5e5] outline-none transition placeholder:text-[#a3a3a3] focus:border-[#3b82f6] focus:ring-2 focus:ring-[#3b82f6]/20'
const textareaClass =
  'min-h-28 w-full resize-y rounded-sm border border-[#404040] bg-[#171717] px-3 py-2 text-sm leading-6 text-[#e5e5e5] outline-none transition placeholder:text-[#a3a3a3] focus:border-[#3b82f6] focus:ring-2 focus:ring-[#3b82f6]/20'
const labelClass = 'text-xs font-semibold uppercase tracking-[0.08em] text-[#a3a3a3]'

export function MessagesPage() {
  const campaigns = communicationRepository.getCampaigns()
  const [messages, setMessages] = useState(() => communicationRepository.getInitialMessages())
  const [templates, setTemplates] = useState(() => communicationRepository.getInitialTemplates())
  const [activeTab, setActiveTab] = useState('historico')
  const [channelFilter, setChannelFilter] = useState('todos')
  const [search, setSearch] = useState('')
  const [composerOpen, setComposerOpen] = useState(false)
  const [templateEditorOpen, setTemplateEditorOpen] = useState(false)
  const [composer, setComposer] = useState(emptyMessage)
  const [templateDraft, setTemplateDraft] = useState(emptyTemplate)

  const filteredMessages = useMemo(
    () =>
      messages.filter((message) => {
        const matchesChannel = channelFilter === 'todos' || message.channel === channelFilter
        const query = search.trim().toLowerCase()
        const matchesSearch =
          !query ||
          [message.patient, message.template, channels[message.channel].label]
            .join(' ')
            .toLowerCase()
            .includes(query)

        return matchesChannel && matchesSearch
      }),
    [channelFilter, messages, search],
  )

  const stats = useMemo(
    () => ({
      total: messages.length,
      delivered: messages.filter((message) => message.status === 'entregue' || message.status === 'lida').length,
      read: messages.filter((message) => message.status === 'lida').length,
      failed: messages.filter((message) => message.status === 'falha').length,
    }),
    [messages],
  )

  function openTemplate(template) {
    setComposer({
      patient: '',
      channel: template.channel,
      template: template.name,
      content: template.content,
    })
    setComposerOpen(true)
  }

  function submitMessage(event) {
    event.preventDefault()

    if (!composer.patient.trim()) {
      return
    }

    setMessages((current) => [
      {
        id: `local-${Date.now()}`,
        patient: composer.patient.trim(),
        channel: composer.channel,
        template: composer.template.trim() || 'Mensagem avulsa',
        sentAt: 'Agora',
        status: 'pendente',
        response: '',
      },
      ...current,
    ])
    setComposer(emptyMessage)
    setComposerOpen(false)
    setActiveTab('historico')
  }

  function submitTemplate(event) {
    event.preventDefault()

    if (!templateDraft.name.trim() || !templateDraft.content.trim()) {
      return
    }

    setTemplates((current) => [
      {
        id: `template-${Date.now()}`,
        name: templateDraft.name.trim(),
        channel: templateDraft.channel,
        content: templateDraft.content.trim(),
        category: templateDraft.category.trim() || 'Personalizado',
      },
      ...current,
    ])
    setTemplateDraft(emptyTemplate)
    setTemplateEditorOpen(false)
  }

  return (
    <div className="mx-auto max-w-7xl space-y-6">
      <div className="flex flex-col items-start justify-between gap-4 md:flex-row md:items-center">
        <div>
          <h1 className="text-2xl font-bold tracking-tight text-[#f5f5f5]">Comunicação</h1>
          <p className="mt-1 text-sm text-[#b8b8b8]">WhatsApp, E-mail e SMS - histórico e campanhas</p>
        </div>

        <div className="flex flex-wrap gap-3">
          <button
            className="inline-flex h-12 items-center gap-2 rounded-sm border border-[#404040] bg-[#262626] px-4 text-sm font-semibold text-[#e5e5e5] transition hover:bg-[#303030]"
            onClick={() => setActiveTab('campanha')}
            type="button"
          >
            <CommIcon className="size-4" name="send" />
            Envio em Massa
          </button>
          <button
            className="inline-flex h-12 items-center gap-2 rounded-sm bg-[#3b82f6] px-4 text-sm font-semibold text-white transition hover:bg-[#2563eb]"
            onClick={() => setComposerOpen(true)}
            type="button"
          >
            <CommIcon className="size-4" name="plus" />
            Nova Mensagem
          </button>
        </div>
      </div>

      <div className="grid grid-cols-2 gap-4 md:grid-cols-4">
        <StatCard label="Total Enviadas" value={stats.total} />
        <StatCard label="Entregues" value={stats.delivered} valueClassName="text-emerald-400" />
        <StatCard label="Lidas" value={stats.read} valueClassName="text-[#3b82f6]" />
        <StatCard label="Falhas" value={stats.failed} valueClassName="text-red-400" />
      </div>

      <div className="flex gap-4 border-b border-[#404040]">
        {[
          ['historico', 'Histórico'],
          ['templates', 'Templates'],
          ['campanha', 'Campanhas'],
        ].map(([key, label]) => (
          <button
            className={`border-b-2 px-2 pb-3 text-sm font-semibold transition ${
              activeTab === key
                ? 'border-[#3b82f6] text-[#3b82f6]'
                : 'border-transparent text-[#b8b8b8] hover:text-[#e5e5e5]'
            }`}
            key={key}
            onClick={() => setActiveTab(key)}
            type="button"
          >
            {label}
          </button>
        ))}
      </div>

      {activeTab === 'historico' ? (
        <section className={`${cardClass} p-5 md:p-6`} aria-label="Histórico de comunicação">
          <div className="mb-6 flex flex-col gap-3 md:flex-row">
            <label className="relative flex-1">
              <span className="sr-only">Buscar comunicação</span>
              <CommIcon
                className="pointer-events-none absolute left-4 top-1/2 size-4 -translate-y-1/2 text-[#a3a3a3]"
                name="search"
              />
              <input
                className={`${inputClass} h-12 pl-12`}
                onChange={(event) => setSearch(event.target.value)}
                placeholder="Buscar paciente..."
                type="search"
                value={search}
              />
            </label>

            <div className="flex flex-wrap gap-2">
              {[
                ['todos', 'Todos'],
                ['whatsapp', 'Whatsapp'],
                ['email', 'E-mail'],
                ['sms', 'Sms'],
              ].map(([key, label]) => (
                <button
                  className={`h-12 rounded-sm border px-4 text-xs font-semibold transition ${
                    channelFilter === key
                      ? 'border-[#3b82f6] bg-[#3b82f6] text-white'
                      : 'border-[#404040] bg-[#171717] text-[#b8b8b8] hover:text-[#e5e5e5]'
                  }`}
                  key={key}
                  onClick={() => setChannelFilter(key)}
                  type="button"
                >
                  {label}
                </button>
              ))}
            </div>
          </div>

          <div className="overflow-x-auto rounded-sm border border-[#404040]">
            <table className="w-full min-w-[920px] text-left text-sm">
              <thead className="bg-[#171717] text-xs font-semibold uppercase tracking-[0.02em] text-[#b8b8b8]">
                <tr>
                  <th className="px-5 py-4">Paciente</th>
                  <th className="px-5 py-4">Canal</th>
                  <th className="px-5 py-4">Template</th>
                  <th className="px-5 py-4">Enviado em</th>
                  <th className="px-5 py-4">Status</th>
                  <th className="px-5 py-4">Resposta</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-[#404040] bg-[#262626]">
                {filteredMessages.map((message) => (
                  <MessageRow key={message.id} message={message} />
                ))}
              </tbody>
            </table>
          </div>

          {filteredMessages.length === 0 ? (
            <div className="rounded-b-sm border-x border-b border-[#404040] bg-[#171717] px-4 py-8 text-center text-sm text-[#a3a3a3]">
              Nenhuma comunicação encontrada com os filtros atuais.
            </div>
          ) : null}
        </section>
      ) : null}

      {activeTab === 'templates' ? (
        <section className="space-y-4" aria-label="Templates de comunicação">
          <div className="flex justify-end">
            <button
              className="inline-flex h-10 items-center gap-2 rounded-sm bg-[#3b82f6] px-4 text-sm font-semibold text-white transition hover:bg-[#2563eb]"
              onClick={() => setTemplateEditorOpen(true)}
              type="button"
            >
              <CommIcon className="size-4" name="plus" />
              Novo Template
            </button>
          </div>

          <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
            {templates.map((template) => (
              <TemplateCard key={template.id} onUse={openTemplate} template={template} />
            ))}
          </div>
        </section>
      ) : null}

      {activeTab === 'campanha' ? (
        <section className={`${cardClass} p-6`} aria-label="Campanhas inteligentes">
          <div className="py-8 text-center">
            <div className="mx-auto mb-4 grid size-16 place-items-center rounded-full bg-[#303030]">
              <CommIcon className="size-8 text-[#51a2ff]" name="send" />
            </div>
            <h2 className="text-lg font-bold text-[#f5f5f5]">Campanhas Inteligentes</h2>
            <p className="mx-auto mt-2 max-w-md text-sm leading-6 text-[#a3a3a3]">
              Crie campanhas segmentadas por perfil comportamental. A IA sugere os melhores horários e canais para
              cada paciente.
            </p>

            <div className="mx-auto mt-6 grid max-w-2xl gap-4 md:grid-cols-3">
              {campaigns.map((campaign) => (
                <div className="rounded-xl border border-[#404040] bg-[#171717] p-4 text-left" key={campaign.title}>
                  <h3 className="text-sm font-bold text-[#f5f5f5]">{campaign.title}</h3>
                  <p className="mt-1 text-xs leading-5 text-[#a3a3a3]">{campaign.desc}</p>
                  <p className="mt-2 text-[10px] font-semibold text-[#51a2ff]">{campaign.count}</p>
                  <button
                    className="mt-3 h-8 w-full rounded-sm bg-[#3b82f6] text-xs font-semibold text-white transition hover:bg-[#2563eb]"
                    onClick={() => {
                      setComposer({
                        patient: campaign.count,
                        channel: 'whatsapp',
                        template: campaign.title,
                        content: campaign.desc,
                      })
                      setComposerOpen(true)
                    }}
                    type="button"
                  >
                    Disparar
                  </button>
                </div>
              ))}
            </div>
          </div>

          <div className="rounded-xl border border-[#404040] bg-[#171717] p-4">
            <div className="mb-3 flex items-center gap-2">
              <span className="rounded bg-indigo-500/20 px-2 py-0.5 text-[10px] font-bold uppercase tracking-[0.12em] text-indigo-400">
                LGPD
              </span>
              <span className="text-sm font-bold text-[#f5f5f5]">Conformidade</span>
            </div>
            <p className="text-xs leading-6 text-[#a3a3a3]">
              Todas as comunicações respeitam as preferências de Opt-in/Opt-out dos pacientes. Os pacientes podem
              cancelar o recebimento de mensagens a qualquer momento, conforme exigido pela LGPD.
            </p>
          </div>
        </section>
      ) : null}

      {composerOpen ? (
        <MessageComposer
          draft={composer}
          onChange={setComposer}
          onClose={() => {
            setComposerOpen(false)
            setComposer(emptyMessage)
          }}
          onSubmit={submitMessage}
          templates={templates}
        />
      ) : null}

      {templateEditorOpen ? (
        <TemplateEditor
          draft={templateDraft}
          onChange={setTemplateDraft}
          onClose={() => {
            setTemplateEditorOpen(false)
            setTemplateDraft(emptyTemplate)
          }}
          onSubmit={submitTemplate}
        />
      ) : null}
    </div>
  )
}

function StatCard({ label, value, valueClassName = 'text-[#f5f5f5]' }) {
  return (
    <div className={`${cardClass} p-5`}>
      <p className="text-sm text-[#b8b8b8]">{label}</p>
      <p className={`mt-2 text-3xl font-bold leading-none ${valueClassName}`}>{value}</p>
    </div>
  )
}

function MessageRow({ message }) {
  const channel = channels[message.channel]
  const status = statusConfig[message.status]

  return (
    <tr className="transition hover:bg-[#303030]">
      <td className="px-5 py-4 font-semibold text-[#f5f5f5]">{message.patient}</td>
      <td className="px-5 py-4">
        <span className={`inline-flex items-center gap-1.5 rounded px-2 py-1 text-[10px] font-bold ${channel.className}`}>
          <CommIcon className="size-3.5" name={channel.icon} />
          {channel.label}
        </span>
      </td>
      <td className="px-5 py-4 text-[#b8b8b8]">{message.template}</td>
      <td className="px-5 py-4 text-[#b8b8b8]">{message.sentAt}</td>
      <td className="px-5 py-4">
        <span className={`inline-flex items-center gap-1.5 text-xs font-semibold ${status.className}`}>
          <CommIcon className="size-3.5" name={status.icon} />
          {status.label}
        </span>
      </td>
      <td className="px-5 py-4 text-[#b8b8b8]">{message.response || '-'}</td>
    </tr>
  )
}

function TemplateCard({ onUse, template }) {
  const channel = channels[template.channel]

  return (
    <article className={`${cardClass} p-5`}>
      <div className="mb-3 flex items-center justify-between gap-3">
        <span className={`inline-flex items-center gap-1.5 rounded px-2 py-1 text-[10px] font-bold ${channel.className}`}>
          <CommIcon className="size-3.5" name={channel.icon} />
          {channel.label}
        </span>
        <span className="rounded bg-[#303030] px-2 py-0.5 text-[10px] font-semibold text-[#a3a3a3]">
          {template.category}
        </span>
      </div>
      <h3 className="text-sm font-bold text-[#f5f5f5]">{template.name}</h3>
      <p className="mt-2 min-h-[72px] text-xs leading-6 text-[#a3a3a3]">{template.content}</p>
      <div className="mt-4 flex gap-2">
        <button
          className="h-9 flex-1 rounded-sm border border-[#404040] bg-[#171717] text-xs font-semibold text-[#e5e5e5] transition hover:bg-[#303030]"
          type="button"
        >
          Editar
        </button>
        <button
          className="h-9 flex-1 rounded-sm bg-[#3b82f6]/10 text-xs font-semibold text-[#3b82f6] transition hover:bg-[#3b82f6]/20"
          onClick={() => onUse(template)}
          type="button"
        >
          Usar
        </button>
      </div>
    </article>
  )
}

function MessageComposer({ draft, onChange, onClose, onSubmit, templates }) {
  function update(field, value) {
    onChange((current) => ({ ...current, [field]: value }))
  }

  function applyTemplate(templateName) {
    const template = templates.find((item) => item.name === templateName)

    if (!template) {
      update('template', templateName)
      return
    }

    onChange((current) => ({
      ...current,
      channel: template.channel,
      template: template.name,
      content: template.content,
    }))
  }

  return (
    <ModalFrame onClose={onClose} title="Nova Mensagem">
      <form className="space-y-4" onSubmit={onSubmit}>
        <div className="grid gap-4 md:grid-cols-2">
          <DarkField label="Paciente">
            <input
              className={inputClass}
              onChange={(event) => update('patient', event.target.value)}
              placeholder="Nome do paciente"
              value={draft.patient}
            />
          </DarkField>
          <DarkField label="Canal">
            <select className={inputClass} onChange={(event) => update('channel', event.target.value)} value={draft.channel}>
              <option value="whatsapp">WhatsApp</option>
              <option value="email">E-mail</option>
              <option value="sms">SMS</option>
            </select>
          </DarkField>
        </div>

        <DarkField label="Template">
          <select className={inputClass} onChange={(event) => applyTemplate(event.target.value)} value={draft.template}>
            <option value="Mensagem avulsa">Mensagem avulsa</option>
            {templates.map((template) => (
              <option key={template.id} value={template.name}>
                {template.name}
              </option>
            ))}
          </select>
        </DarkField>

        <DarkField label="Mensagem">
          <textarea
            className={textareaClass}
            onChange={(event) => update('content', event.target.value)}
            placeholder="Escreva a mensagem mockada..."
            value={draft.content}
          />
        </DarkField>

        <div className="flex justify-end gap-3 border-t border-[#404040] pt-4">
          <button className="h-10 rounded-sm border border-[#404040] px-4 text-sm font-semibold text-[#e5e5e5]" onClick={onClose} type="button">
            Cancelar
          </button>
          <button
            className="h-10 rounded-sm bg-[#3b82f6] px-4 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-50"
            disabled={!draft.patient.trim()}
            type="submit"
          >
            Enviar
          </button>
        </div>
      </form>
    </ModalFrame>
  )
}

function TemplateEditor({ draft, onChange, onClose, onSubmit }) {
  function update(field, value) {
    onChange((current) => ({ ...current, [field]: value }))
  }

  return (
    <ModalFrame onClose={onClose} title="Novo Template">
      <form className="space-y-4" onSubmit={onSubmit}>
        <div className="grid gap-4 md:grid-cols-2">
          <DarkField label="Nome">
            <input className={inputClass} onChange={(event) => update('name', event.target.value)} value={draft.name} />
          </DarkField>
          <DarkField label="Canal">
            <select className={inputClass} onChange={(event) => update('channel', event.target.value)} value={draft.channel}>
              <option value="whatsapp">WhatsApp</option>
              <option value="email">E-mail</option>
              <option value="sms">SMS</option>
            </select>
          </DarkField>
        </div>
        <DarkField label="Categoria">
          <input className={inputClass} onChange={(event) => update('category', event.target.value)} value={draft.category} />
        </DarkField>
        <DarkField label="Conteúdo">
          <textarea className={textareaClass} onChange={(event) => update('content', event.target.value)} value={draft.content} />
        </DarkField>
        <div className="flex justify-end gap-3 border-t border-[#404040] pt-4">
          <button className="h-10 rounded-sm border border-[#404040] px-4 text-sm font-semibold text-[#e5e5e5]" onClick={onClose} type="button">
            Cancelar
          </button>
          <button
            className="h-10 rounded-sm bg-[#3b82f6] px-4 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-50"
            disabled={!draft.name.trim() || !draft.content.trim()}
            type="submit"
          >
            Salvar Template
          </button>
        </div>
      </form>
    </ModalFrame>
  )
}

function ModalFrame({ children, onClose, title }) {
  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/70 p-4">
      <div className="w-full max-w-2xl rounded-2xl border border-[#404040] bg-[#262626] shadow-2xl">
        <div className="flex items-center justify-between border-b border-[#404040] px-5 py-4">
          <h2 className="text-lg font-bold text-[#f5f5f5]">{title}</h2>
          <button className="grid size-9 place-items-center rounded-sm text-[#a3a3a3] hover:bg-[#303030]" onClick={onClose} type="button">
            <CommIcon className="size-5" name="x" />
          </button>
        </div>
        <div className="p-5">{children}</div>
      </div>
    </div>
  )
}

function DarkField({ children, label }) {
  return (
    <label className="space-y-2">
      <span className={labelClass}>{label}</span>
      {children}
    </label>
  )
}

function CommIcon({ className = 'size-4', name }) {
  const common = {
    className,
    fill: 'none',
    stroke: 'currentColor',
    strokeLinecap: 'round',
    strokeLinejoin: 'round',
    strokeWidth: 1.9,
    viewBox: '0 0 24 24',
  }

  if (name === 'message') {
    return (
      <svg {...common}>
        <path d="M5 5h14v10H8l-4 4V6a1 1 0 0 1 1-1Z" />
      </svg>
    )
  }

  if (name === 'mail') {
    return (
      <svg {...common}>
        <path d="M4 6h16v12H4z" />
        <path d="m4 7 8 6 8-6" />
      </svg>
    )
  }

  if (name === 'phone') {
    return (
      <svg {...common}>
        <path d="M7 4h10v16H7z" />
        <path d="M11 17h2" />
      </svg>
    )
  }

  if (name === 'send') {
    return (
      <svg {...common}>
        <path d="m22 2-7 20-4-9-9-4 20-7Z" />
        <path d="M22 2 11 13" />
      </svg>
    )
  }

  if (name === 'plus') {
    return (
      <svg {...common}>
        <path d="M12 5v14M5 12h14" />
      </svg>
    )
  }

  if (name === 'search') {
    return (
      <svg {...common}>
        <path d="m21 21-4.3-4.3" />
        <circle cx="11" cy="11" r="7" />
      </svg>
    )
  }

  if (name === 'check') {
    return (
      <svg {...common}>
        <circle cx="12" cy="12" r="9" />
        <path d="m8 12 2.5 2.5L16 9" />
      </svg>
    )
  }

  if (name === 'eye') {
    return (
      <svg {...common}>
        <path d="M2 12s3.5-6 10-6 10 6 10 6-3.5 6-10 6S2 12 2 12Z" />
        <circle cx="12" cy="12" r="2.5" />
      </svg>
    )
  }

  if (name === 'x-circle') {
    return (
      <svg {...common}>
        <circle cx="12" cy="12" r="9" />
        <path d="m9 9 6 6M15 9l-6 6" />
      </svg>
    )
  }

  if (name === 'clock') {
    return (
      <svg {...common}>
        <circle cx="12" cy="12" r="9" />
        <path d="M12 7v5l3 2" />
      </svg>
    )
  }

  if (name === 'x') {
    return (
      <svg {...common}>
        <path d="m18 6-12 12M6 6l12 12" />
      </svg>
    )
  }

  return (
    <svg {...common}>
      <path d="M3 12h4l2-5 4 10 2-5h6" />
    </svg>
  )
}