/**
 * ChangePasswordModal 组件
 * 
 * 修改密码模态框组件
 * 支持首次登录强制修改密码和普通修改密码
 * 使用统一的 Modal 和 Input 组件，遵循三层架构
 * 
 * @created 2025-01-XX
 * @component
 */

'use client'

import { useState } from 'react'
import { useSession } from 'next-auth/react'
import { useDialog } from '@/components/ui/DialogProvider'
import Modal from '@/components/ui/Modal'
import Input from '@/components/ui/Input'
import Button from '@/components/ui/Button'
import { useThemeStyles, cn } from '@/lib/ui-styles'
import { PASSWORD_POLICY_DESCRIPTION, validatePasswordStrength } from '@/lib/password-policy'

interface ChangePasswordModalProps {
  isOpen: boolean
  onClose: () => void
  isRequired?: boolean // 是否强制修改（首次登录）
  onSuccess?: () => void
}

export default function ChangePasswordModal({
  isOpen,
  onClose,
  isRequired = false,
  onSuccess
}: ChangePasswordModalProps) {
  const { alert } = useDialog()
  const { update } = useSession()
  const styles = useThemeStyles()
  const [oldPassword, setOldPassword] = useState('')
  const [newPassword, setNewPassword] = useState('')
  const [confirmPassword, setConfirmPassword] = useState('')
  const [error, setError] = useState('')
  const [loading, setLoading] = useState(false)

  const resetForm = () => {
    setOldPassword('')
    setNewPassword('')
    setConfirmPassword('')
    setError('')
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError('')

    if (!newPassword || !confirmPassword) {
      setError('请填写所有字段')
      return
    }

    const passwordValidation = validatePasswordStrength(newPassword)
    if (!passwordValidation.valid) {
      setError(passwordValidation.error || '新密码不符合安全要求')
      return
    }

    if (newPassword !== confirmPassword) {
      setError('两次输入的密码不一致')
      return
    }

    setLoading(true)

    try {
      const payload = isRequired
        ? { newPassword }
        : { oldPassword, newPassword }

      const response = await fetch('/api/user/change-password', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(payload),
      })

      const data = await response.json()

      if (response.ok) {
        resetForm()
        try {
          await update()
        } catch (error) {
          console.warn('刷新会话状态失败:', error)
        }
        
        if (onSuccess) {
          onSuccess()
        } else {
          onClose()
        }
        
        // 显示成功消息
        alert({
          title: '成功',
          message: '密码修改成功！',
          variant: 'success',
        })
      } else {
        setError(data.error || '修改密码失败')
      }
    } catch (error) {
      console.error('修改密码错误:', error)
      setError('修改密码失败，请稍后重试')
    } finally {
      setLoading(false)
    }
  }

  const formContent = (
    <form onSubmit={handleSubmit} className="space-y-4">
      {!isRequired && (
        <div>
          <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">
            旧密码
          </label>
          <Input
            type="password"
            value={oldPassword}
            onChange={(e) => setOldPassword(e.target.value)}
            placeholder="请输入旧密码"
            required={!isRequired}
            fullWidth
          />
        </div>
      )}

      <div>
        <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">
          新密码
        </label>
        <Input
          type="password"
          value={newPassword}
          onChange={(e) => setNewPassword(e.target.value)}
          placeholder="请输入新密码"
          required
          minLength={10}
          fullWidth
        />
        <p className="mt-2 text-xs leading-5 text-slate-500 dark:text-slate-400">
          {PASSWORD_POLICY_DESCRIPTION}
        </p>
      </div>

      <div>
        <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">
          确认新密码
        </label>
        <Input
          type="password"
          value={confirmPassword}
          onChange={(e) => setConfirmPassword(e.target.value)}
          placeholder="请再次输入新密码"
          required
          minLength={10}
          fullWidth
        />
      </div>

      {error && (
        <div className={cn(
          'p-3 rounded-md border',
          'bg-red-50 dark:bg-red-900/20',
          'border-red-200 dark:border-red-800'
        )}>
          <p className="text-sm text-red-800 dark:text-red-200">{error}</p>
        </div>
      )}

      <div className="flex gap-3 justify-end">
        {!isRequired && (
          <Button
            type="button"
            variant="secondary"
            onClick={onClose}
          >
            取消
          </Button>
        )}
        <Button
          type="submit"
          variant="primary"
          disabled={loading}
          loading={loading}
          className="min-w-24 justify-center"
        >
          {loading ? '修改中...' : '确认修改'}
        </Button>
      </div>
    </form>
  )

  if (!isOpen) return null

  if (isRequired) {
    return (
      <section className="mx-auto flex min-h-[calc(100vh-6rem)] w-full max-w-md items-center justify-center px-4 py-10">
        <div className="w-full rounded-lg border border-slate-200 bg-white shadow-sm dark:border-slate-800 dark:bg-slate-900">
          <div className="border-b border-slate-200 px-6 py-5 dark:border-slate-800">
            <p className="text-xs font-medium text-slate-500 dark:text-slate-400">账号安全</p>
            <h1 className="mt-2 text-xl font-semibold text-slate-950 dark:text-white">
              设置新密码
            </h1>
            <p className="mt-2 text-sm leading-6 text-slate-500 dark:text-slate-400">
              首次登录需要先更换初始密码，完成后才能进入素材库。
            </p>
          </div>

          <div className="space-y-5 px-6 py-5">
            <div className="rounded-md border border-amber-200 bg-amber-50 px-3 py-2.5 dark:border-amber-900/60 dark:bg-amber-950/30">
              <p className="text-sm leading-6 text-amber-800 dark:text-amber-200">
                当前账号仍在使用系统初始化密码，请设置一个只由您掌握的新密码。
              </p>
            </div>
            {formContent}
          </div>
        </div>
      </section>
    )
  }

  return (
    <Modal
      isOpen={isOpen}
      onClose={onClose}
      title="修改密码"
      showCloseButton
      closeOnOverlayClick
      closeOnEscape
    >
      {formContent}
    </Modal>
  )
}