// SPDX-License-Identifier: AGPL-3.0-or-later

import type {ApiContext} from '@app/api/ApiContext';
import {mapUserToAdminResponse} from '@app/api/admin/models/UserTypes';
import type {AdminAuditService} from '@app/api/admin/services/AdminAuditService';
import type {AdminUserUpdatePropagator} from '@app/api/admin/services/AdminUserUpdatePropagator';
import {createUserID, type UserID} from '@app/api/BrandedTypes';
import type {IGuildRepositoryAggregate} from '@app/api/guild/repositories/IGuildRepositoryAggregate';
import {GuildMemberSearchIndexService} from '@app/api/guild/services/member/GuildMemberSearchIndexService';
import type {IDiscriminatorService} from '@app/api/infrastructure/DiscriminatorService';
import type {EntityAssetService, PreparedAssetUpload} from '@app/api/infrastructure/EntityAssetService';
import {Logger} from '@app/api/Logger';
import {getInstanceConfigRepository} from '@app/api/middleware/ServiceSingletons';
import type {User} from '@app/api/models/User';
import {enqueueStripeCustomerEmailSync} from '@app/api/stripe/StripeCustomer';
import {assertNoDiscriminatorChange, reserveUsername, type UsernameReservation} from '@app/api/user/UniqueUsernames';
import {USERNAME_MODE_DISCRIMINATOR} from '@app/api/user/UserTag';
import {TagAlreadyTakenError} from '@fluxer/errors/src/domains/user/TagAlreadyTakenError';
import {UnknownUserError} from '@fluxer/errors/src/domains/user/UnknownUserError';
import type {
	ChangeDobRequest,
	ChangeEmailRequest,
	ChangeUsernameRequest,
	ClearUserFieldsRequest,
	VerifyUserEmailRequest,
} from '@fluxer/schema/src/domains/admin/AdminUserSchemas';
import {types} from 'cassandra-driver';

interface AdminUserProfileServiceDeps {
	apiContext: ApiContext;
	discriminatorService: IDiscriminatorService;
	entityAssetService: EntityAssetService;
	auditService: AdminAuditService;
	updatePropagator: AdminUserUpdatePropagator;
	guildRepository: IGuildRepositoryAggregate;
}

export class AdminUserProfileService {
	private readonly searchIndexService: GuildMemberSearchIndexService;

	constructor(private readonly deps: AdminUserProfileServiceDeps) {
		this.searchIndexService = new GuildMemberSearchIndexService();
	}

	async clearUserFields(
		data: ClearUserFieldsRequest,
		adminUserId: UserID,
		auditLogReason: string | null,
		acls: ReadonlySet<string>,
	) {
		const {users: userRepository, cache: cacheService} = this.deps.apiContext.services;
		const {entityAssetService, auditService, updatePropagator} = this.deps;
		const userId = createUserID(data.user_id);
		const user = await userRepository.findUnique(userId);
		if (!user) {
			throw new UnknownUserError();
		}
		const updates: Record<string, null | string> = {};
		const preparedAssets: Array<PreparedAssetUpload> = [];
		for (const field of data.fields) {
			if (field === 'avatar') {
				const prepared = await entityAssetService.prepareAssetUpload({
					assetType: 'avatar',
					entityType: 'user',
					entityId: userId,
					previousHash: user.avatarHash,
					base64Image: null,
					errorPath: 'avatar',
				});
				preparedAssets.push(prepared);
				updates['avatar_hash'] = prepared.newHash;
			} else if (field === 'banner') {
				const prepared = await entityAssetService.prepareAssetUpload({
					assetType: 'banner',
					entityType: 'user',
					entityId: userId,
					previousHash: user.bannerHash,
					base64Image: null,
					errorPath: 'banner',
				});
				preparedAssets.push(prepared);
				updates['banner_hash'] = prepared.newHash;
			} else if (field === 'bio') {
				updates['bio'] = null;
			} else if (field === 'pronouns') {
				updates['pronouns'] = null;
			} else if (field === 'global_name') {
				updates['global_name'] = null;
			}
		}
		const updatedUser = await userRepository.patchUpsert(userId, updates, user.toRow());
		await entityAssetService.commitAssetChanges(preparedAssets);
		await updatePropagator.propagateUserUpdate({userId, oldUser: user, updatedUser: updatedUser});
		await auditService.createAuditLog({
			adminUserId,
			targetType: 'user',
			targetId: BigInt(userId),
			action: 'clear_fields',
			auditLogReason,
			metadata: new Map([['fields', data.fields.join(',')]]),
		});
		return {
			user: await mapUserToAdminResponse(updatedUser, cacheService, acls),
		};
	}

	async verifyUserEmail(
		data: VerifyUserEmailRequest,
		adminUserId: UserID,
		auditLogReason: string | null,
		acls: ReadonlySet<string>,
	) {
		const {users: userRepository, cache: cacheService} = this.deps.apiContext.services;
		const {auditService, updatePropagator} = this.deps;
		const userId = createUserID(data.user_id);
		const user = await userRepository.findUnique(userId);
		if (!user) {
			throw new UnknownUserError();
		}
		const updatedUser = await userRepository.patchUpsert(
			userId,
			{email_verified: true, email_bounced: false},
			user.toRow(),
		);
		await updatePropagator.propagateUserUpdate({userId, oldUser: user, updatedUser: updatedUser});
		await auditService.createAuditLog({
			adminUserId,
			targetType: 'user',
			targetId: BigInt(userId),
			action: 'verify_email',
			auditLogReason,
			metadata: new Map([['email', user.email ?? 'null']]),
		});
		return {
			user: await mapUserToAdminResponse(updatedUser, cacheService, acls),
		};
	}

	async changeUsername(
		data: ChangeUsernameRequest,
		adminUserId: UserID,
		auditLogReason: string | null,
		acls: ReadonlySet<string>,
	) {
		const {
			users: userRepository,
			cache: cacheService,
			contactChangeLog: contactChangeLogService,
		} = this.deps.apiContext.services;
		const {discriminatorService, auditService, updatePropagator} = this.deps;
		const userId = createUserID(data.user_id);
		const user = await userRepository.findUnique(userId);
		if (!user) {
			throw new UnknownUserError();
		}
		const uniqueUsernames = !user.isBot && (await getInstanceConfigRepository().usesUniqueUsernames());
		if (uniqueUsernames) {
			assertNoDiscriminatorChange(data.discriminator, user.discriminator);
		}
		const reservation: UsernameReservation | null = uniqueUsernames
			? await reserveUsername({users: userRepository, cache: cacheService}, data.username, userId)
			: null;
		let updatedUser: User;
		let discriminatorResult: {discriminator: number; available: boolean};
		try {
			discriminatorResult = uniqueUsernames
				? {discriminator: USERNAME_MODE_DISCRIMINATOR, available: true}
				: await discriminatorService.generateDiscriminator({
						username: data.username,
						requestedDiscriminator: data.discriminator,
						user,
					});
			if (!discriminatorResult.available || discriminatorResult.discriminator === -1) {
				throw new TagAlreadyTakenError();
			}
			updatedUser = await userRepository.patchUpsert(
				userId,
				{
					username: data.username,
					discriminator: discriminatorResult.discriminator,
				},
				user.toRow(),
			);
		} finally {
			await reservation?.release();
		}
		await updatePropagator.propagateUserUpdate({userId, oldUser: user, updatedUser: updatedUser});
		await contactChangeLogService.recordDiff({
			oldUser: user,
			newUser: updatedUser,
			reason: 'admin_action',
			actorUserId: adminUserId,
		});
		await auditService.createAuditLog({
			adminUserId,
			targetType: 'user',
			targetId: BigInt(userId),
			action: 'change_username',
			auditLogReason,
			metadata: new Map([
				['old_username', user.username],
				['new_username', data.username],
				['discriminator', discriminatorResult.discriminator.toString()],
			]),
		});
		void this.reindexGuildMembersForUser(updatedUser);
		return {
			user: await mapUserToAdminResponse(updatedUser, cacheService, acls),
		};
	}

	async changeEmail(
		data: ChangeEmailRequest,
		adminUserId: UserID,
		auditLogReason: string | null,
		acls: ReadonlySet<string>,
	) {
		const {
			users: userRepository,
			cache: cacheService,
			contactChangeLog: contactChangeLogService,
			worker: workerService,
		} = this.deps.apiContext.services;
		const {auditService, updatePropagator} = this.deps;
		const userId = createUserID(data.user_id);
		const user = await userRepository.findUnique(userId);
		if (!user) {
			throw new UnknownUserError();
		}
		const updatedUser = await userRepository.patchUpsert(
			userId,
			{
				email: data.email,
				email_verified: false,
			},
			user.toRow(),
		);
		await updatePropagator.propagateUserUpdate({userId, oldUser: user, updatedUser: updatedUser});
		await contactChangeLogService.recordDiff({
			oldUser: user,
			newUser: updatedUser,
			reason: 'admin_action',
			actorUserId: adminUserId,
		});
		await enqueueStripeCustomerEmailSync(workerService, user, updatedUser);
		await auditService.createAuditLog({
			adminUserId,
			targetType: 'user',
			targetId: BigInt(userId),
			action: 'change_email',
			auditLogReason,
			metadata: new Map([
				['old_email', user.email ?? 'null'],
				['new_email', data.email],
			]),
		});
		return {
			user: await mapUserToAdminResponse(updatedUser, cacheService, acls),
		};
	}

	private async reindexGuildMembersForUser(updatedUser: User): Promise<void> {
		try {
			const {users: userRepository} = this.deps.apiContext.services;
			const {guildRepository} = this.deps;
			const guildIds = await userRepository.getUserGuildIds(updatedUser.id);
			await this.searchIndexService.updateUserMembers(updatedUser, guildIds, guildRepository);
		} catch (error) {
			Logger.error(
				{userId: updatedUser.id.toString(), error},
				'Failed to reindex guild members after admin user update',
			);
		}
	}

	async changeDob(
		data: ChangeDobRequest,
		adminUserId: UserID,
		auditLogReason: string | null,
		acls: ReadonlySet<string>,
	) {
		const {users: userRepository, cache: cacheService} = this.deps.apiContext.services;
		const {auditService, updatePropagator} = this.deps;
		const userId = createUserID(data.user_id);
		const user = await userRepository.findUnique(userId);
		if (!user) {
			throw new UnknownUserError();
		}
		const updatedUser = await userRepository.patchUpsert(
			userId,
			{
				date_of_birth: types.LocalDate.fromString(data.date_of_birth),
			},
			user.toRow(),
		);
		await updatePropagator.propagateUserUpdate({userId, oldUser: user, updatedUser: updatedUser});
		await auditService.createAuditLog({
			adminUserId,
			targetType: 'user',
			targetId: BigInt(userId),
			action: 'change_dob',
			auditLogReason,
			metadata: new Map([
				['old_dob', user.dateOfBirth ?? 'null'],
				['new_dob', data.date_of_birth],
			]),
		});
		return {
			user: await mapUserToAdminResponse(updatedUser, cacheService, acls),
		};
	}
}