export type Permission =
  | 'application-form:read'
  | 'application-form:write'
  | 'application-form:sign'
  | 'application-form-template:add'
  | 'application-form-template:edit'
  | 'application-form-template:delete'
  | 'comment:add'
  | 'comment:edit'
  | 'comment:delete'

export type Role =
  | 'CHIEF_EXECUTIVE_OFFICER'
  | 'BUSINESS_DEPARTMENT'
  | 'IT_DEPARTMENT'
  | 'HUMAN_RESOURCES'
  | 'HEAD_OF_WORKS_COUNCIL'
  | 'WORKS_COUNCIL'
  | 'EMPLOYEE'

const ROLE_PERMISSIONS: Record<Role, Permission[]> = {
  CHIEF_EXECUTIVE_OFFICER: [
    'application-form:read',
    'application-form:write',
    'application-form:sign',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  HEAD_OF_WORKS_COUNCIL: [
    'application-form:read',
    'application-form:write',
    'application-form:sign',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  BUSINESS_DEPARTMENT: [
    'application-form:read',
    'application-form:write',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  IT_DEPARTMENT: [
    'application-form:read',
    'application-form:write',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  HUMAN_RESOURCES: [
    'application-form:read',
    'application-form:write',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  WORKS_COUNCIL: [
    'application-form:read',
    'application-form:write',
    'application-form-template:add',
    'application-form-template:edit',
    'application-form-template:delete',
    'comment:add',
    'comment:edit',
    'comment:delete'
  ],
  EMPLOYEE: ['application-form:read', 'comment:add', 'comment:edit']
}

export const usePermissions = () => {
  const { user } = useUserSession()

  const userRoles = computed<Role[]>(() => {
    return (user.value?.roles ?? []) as Role[]
  })

  const userPermissions = computed<Permission[]>(() => {
    const permissions = new Set<Permission>()
    userRoles.value.forEach((role) => {
      const rolePermissions = ROLE_PERMISSIONS[role] ?? []
      rolePermissions.forEach((permission) => permissions.add(permission))
    })
    return Array.from(permissions)
  })

  const hasPermission = (permission: Permission): boolean => {
    return userPermissions.value.includes(permission)
  }

  const hasAnyPermission = (permissions: Permission[]): boolean => {
    return permissions.some((permission) => hasPermission(permission))
  }

  const hasAllPermissions = (permissions: Permission[]): boolean => {
    return permissions.every((permission) => hasPermission(permission))
  }

  const hasRole = (role: Role): boolean => {
    return userRoles.value.includes(role)
  }

  const hasAnyRole = (roles: Role[]): boolean => {
    return roles.some((role) => hasRole(role))
  }

  const canReadApplicationForms = computed(() => hasPermission('application-form:read'))
  const canWriteApplicationForms = computed(() => hasPermission('application-form:write'))
  const canSignApplicationForms = computed(() => hasPermission('application-form:sign'))
  const canAddTemplate = computed(() => hasPermission('application-form-template:add'))
  const canEditTemplate = computed(() => hasPermission('application-form-template:edit'))
  const canDeleteTemplate = computed(() => hasPermission('application-form-template:delete'))
  const canAddComment = computed(() => hasPermission('comment:add'))
  const canEditComment = computed(() => hasPermission('comment:edit'))
  const canDeleteComment = computed(() => hasPermission('comment:delete'))

  return {
    userRoles,
    userPermissions,
    hasPermission,
    hasAnyPermission,
    hasAllPermissions,
    hasRole,
    hasAnyRole,
    canReadApplicationForms,
    canWriteApplicationForms,
    canSignApplicationForms,
    canAddTemplate,
    canEditTemplate,
    canDeleteTemplate,
    canAddComment,
    canEditComment,
    canDeleteComment
  }
}