import { useApi } from '@/composables/useApi'
import type { LinkableUser } from '@/lib/directoryTypes'
import type { RoleRef } from '@/lib/permissions'
import type { AcceptedUser, CreatedInvite, OwnershipTransfer, UserListItem } from '@/lib/users'

export type { AcceptedUser, CreatedInvite, OwnershipTransfer, UserListItem }

export const USER_SKELETON_ROWS = 5

export function userRowKey(kind: UserListItem['kind'], id: number) {
	return `${kind}-${id}`
}

export function userDisplayName(item: UserListItem) {
	return item.kind === 'user' ? item.display_name : ''
}

export function userRole(item: UserListItem): RoleRef | null {
	return item.role ?? null
}

const JSON_HEADERS = { 'Content-Type': 'application/json' }

export function useUsers() {
	const { request } = useApi()

	function listUsers(): Promise<UserListItem[]> {
		return request<UserListItem[]>('/v1/user/')
	}

	async function listLinkableUsers(
		takenUserIds: ReadonlySet<number | null>,
	): Promise<LinkableUser[]> {
		const users = await listUsers()
		return users.flatMap((user) =>
			user.kind === 'user' && !takenUserIds.has(user.id)
				? [
						{
							id: user.id,
							label: user.display_name || user.username,
							email: user.email,
						},
					]
				: [],
		)
	}

	function inviteUser(email: string, roleId?: number): Promise<CreatedInvite> {
		return request<CreatedInvite>('/v1/user/invite', {
			method: 'POST',
			headers: JSON_HEADERS,
			body: JSON.stringify(roleId === undefined ? { email } : { email, role_id: roleId }),
		})
	}

	function changeUserRole(id: number, roleId: number): Promise<AcceptedUser> {
		return request<AcceptedUser>(`/v1/user/${id}/role`, {
			method: 'PUT',
			headers: JSON_HEADERS,
			body: JSON.stringify({ role_id: roleId }),
		})
	}

	function transferOwnership(userId: number, confirmEmail: string): Promise<OwnershipTransfer> {
		return request<OwnershipTransfer>('/v1/site/transfer-ownership', {
			method: 'POST',
			headers: JSON_HEADERS,
			body: JSON.stringify({ user_id: userId, confirm_email: confirmEmail }),
		})
	}

	function removeUser(id: number, expectedRoleId: number): Promise<void> {
		return request<void>(`/v1/user/${id}?expected_role_id=${expectedRoleId}`, {
			method: 'DELETE',
		})
	}

	function cancelInvite(id: number): Promise<void> {
		return request<void>(`/v1/user/invite/${id}`, { method: 'DELETE' })
	}

	function renewInvite(id: number): Promise<CreatedInvite> {
		return request<CreatedInvite>(`/v1/user/invite/${id}/renew`, {
			method: 'POST',
		})
	}

	return {
		listUsers,
		listLinkableUsers,
		inviteUser,
		changeUserRole,
		transferOwnership,
		removeUser,
		cancelInvite,
		renewInvite,
	}
}