import { resetUserPassword, getUserByUsername, deleteAllUserSessions, getDatabase } from '~/server/utils/database'
import { getSessionUsername } from '~/server/utils/auth'

export default defineEventHandler(async (event) => {
  const username = await getSessionUsername(event)
  
  if (!username) {
    throw createError({
      statusCode: 401,
      message: 'Unauthorized'
    })
  }

  const user = getUserByUsername(username)
  
  if (!user || user.is_admin !== 1) {
    throw createError({
      statusCode: 403,
      message: 'Forbidden - Admin access required'
    })
  }

  const id = parseInt(event.context.params?.id || '')
  const body = await readBody(event)
  const { newPassword } = body
  
  if (isNaN(id)) {
    throw createError({
      statusCode: 400,
      message: 'Invalid user ID'
    })
  }

  if (!newPassword || typeof newPassword !== 'string') {
    throw createError({
      statusCode: 400,
      message: 'New password is required'
    })
  }

  // Validate password strength
  if (newPassword.length < 8) {
    throw createError({
      statusCode: 400,
      message: 'Password must be at least 8 characters long'
    })
  }

  if (!/[A-Z]/.test(newPassword)) {
    throw createError({
      statusCode: 400,
      message: 'Password must contain at least one uppercase letter'
    })
  }

  if (!/[a-z]/.test(newPassword)) {
    throw createError({
      statusCode: 400,
      message: 'Password must contain at least one lowercase letter'
    })
  }

  if (!/[0-9!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]/.test(newPassword)) {
    throw createError({
      statusCode: 400,
      message: 'Password must contain at least one number or symbol'
    })
  }

  try {
    // Get the target user's username before resetting password
    const db = getDatabase()
    const targetUser = db.prepare('SELECT username FROM users WHERE id = ?').get(id) as { username: string } | undefined

    if (!targetUser) {
      throw createError({
        statusCode: 404,
        message: 'User not found'
      })
    }

    // Reset the password
    resetUserPassword(id, newPassword)

    // SECURITY: Invalidate ALL sessions when admin resets a user's password
    // This prevents session fixation and forces user to log in with new password
    deleteAllUserSessions(targetUser.username)

    return {
      success: true,
      message: 'Password reset successfully. User will need to log in with the new password.'
    }
  } catch (error: any) {
    // Re-throw createError instances
    if (error.statusCode) {
      throw error
    }

    throw createError({
      statusCode: 500,
      message: 'Failed to reset password'
    })
  }
})