import * as lib from "../../../backend/sync_lib/pkg/sync_lib.js";

import type { Client } from "openapi-fetch";
import createClient from "openapi-fetch";
import type { components, paths } from "./types.js"; // Generated by openapi-typescript
import type { Database } from "src/database/database";
import type { SyncSettings } from "src/database/sync-settings";
import type {
	DocumentId,
	RelativePath,
	VaultUpdateId,
} from "src/database/document-metadata";
import { Logger } from "src/tracing/logger.js";
import { retriedFetch } from "src/utils/retried-fetch.js";

export interface CheckConnectionResult {
	isSuccessful: boolean;
	message: string;
}
export class SyncService {
	private client: Client<paths>;
	private clientWithoutRetries: Client<paths>;

	public constructor(private readonly database: Database) {
		this.createClient(database.getSettings());

		database.addOnSettingsChangeHandlers((s) => {
			this.createClient(s);
		});
	}

	private static formatError(
		error: components["schemas"]["SerializedError"]
	): string {
		let result = error.message;
		if (error.causes.length > 0) {
			const causes = error.causes.join(", ");
			result += ` caused by: ${causes}`;
		}

		return result;
	}

	public async ping(): Promise<components["schemas"]["PingResponse"]> {
		const response = await this.clientWithoutRetries.GET("/ping", {
			params: {
				header: {
					authorization: `Bearer ${
						this.database.getSettings().token
					}`,
				},
			},
		});

		Logger.getInstance().debug(
			`Ping response: ${JSON.stringify(response.data)}`
		);

		if (!response.data) {
			throw new Error(
				`Failed to ping server: ${SyncService.formatError(
					response.error
				)}`
			);
		}

		return response.data;
	}

	public async create({
		relativePath,
		contentBytes,
		createdDate,
	}: {
		relativePath: RelativePath;
		contentBytes: Uint8Array;
		createdDate: Date;
	}): Promise<components["schemas"]["DocumentVersion"]> {
		const response = await this.client.POST(
			"/vaults/{vault_id}/documents",
			{
				params: {
					path: {
						vault_id: this.database.getSettings().vaultName,
					},
					header: {
						authorization: `Bearer ${
							this.database.getSettings().token
						}`,
					},
				},
				body: {
					contentBase64: lib.bytesToBase64(contentBytes),
					createdDate: createdDate.toISOString(),
					relativePath,
				},
			}
		);

		if (!response.data) {
			throw new Error(
				`Failed to create document: ${SyncService.formatError(
					response.error
				)}`
			);
		}

		Logger.getInstance().debug(
			`Created document ${JSON.stringify(
				response.data.relativePath
			)} with id ${response.data.documentId}`
		);

		return response.data;
	}

	public async put({
		parentVersionId,
		documentId,
		relativePath,
		contentBytes,
		createdDate,
	}: {
		parentVersionId: VaultUpdateId;
		documentId: DocumentId;
		relativePath: RelativePath;
		contentBytes: Uint8Array;
		createdDate: Date;
	}): Promise<components["schemas"]["DocumentVersion"]> {
		const response = await this.client.PUT(
			"/vaults/{vault_id}/documents/{document_id}",
			{
				params: {
					path: {
						vault_id: this.database.getSettings().vaultName,
						document_id: documentId,
					},
					header: {
						authorization: `Bearer ${
							this.database.getSettings().token
						}`,
					},
				},
				body: {
					parentVersionId,
					contentBase64: lib.bytesToBase64(contentBytes),
					createdDate: createdDate.toISOString(),
					relativePath,
				},
			}
		);

		if (!response.data) {
			throw new Error(
				`Failed to update document: ${SyncService.formatError(
					response.error
				)}`
			);
		}

		Logger.getInstance().debug(
			`Updated document ${response.data.relativePath} with id ${response.data.documentId}`
		);

		return response.data;
	}

	public async delete({
		documentId,
		relativePath,
		createdDate,
	}: {
		documentId: DocumentId;
		relativePath: RelativePath;
		createdDate: Date;
	}): Promise<void> {
		const response = await this.client.DELETE(
			"/vaults/{vault_id}/documents/{document_id}",
			{
				params: {
					path: {
						vault_id: this.database.getSettings().vaultName,
						document_id: documentId,
					},
					header: {
						authorization: `Bearer ${
							this.database.getSettings().token
						}`,
					},
				},
				body: {
					createdDate: createdDate.toISOString(),
					relativePath,
				},
			}
		);

		if (response.error) {
			throw new Error(`Failed to delete document`);
		}

		Logger.getInstance().debug(
			`Deleted document ${relativePath} with id ${documentId}`
		);

		return response.data;
	}

	public async get({
		documentId,
	}: {
		documentId: DocumentId;
	}): Promise<components["schemas"]["DocumentVersion"]> {
		const response = await this.client.GET(
			"/vaults/{vault_id}/documents/{document_id}",
			{
				params: {
					path: {
						vault_id: this.database.getSettings().vaultName,
						document_id: documentId,
					},
					header: {
						authorization: `Bearer ${
							this.database.getSettings().token
						}`,
					},
				},
			}
		);

		if (!response.data) {
			throw new Error(
				`Failed to get document: ${SyncService.formatError(
					response.error
				)}`
			);
		}

		Logger.getInstance().debug(
			`Get document ${response.data.relativePath} with id ${response.data.documentId}`
		);

		return response.data;
	}

	public async getAll(
		since?: VaultUpdateId
	): Promise<components["schemas"]["FetchLatestDocumentsResponse"]> {
		const response = await this.client.GET("/vaults/{vault_id}/documents", {
			params: {
				path: {
					vault_id: this.database.getSettings().vaultName,
				},
				header: {
					authorization: `Bearer ${
						this.database.getSettings().token
					}`,
				},
				query: {
					since_update_id: since,
				},
			},
		});

		const { error } = response;
		if (error) {
			throw new Error(
				`Failed to get documents: ${SyncService.formatError(
					response.error
				)}`
			);
		}

		Logger.getInstance().debug(
			`Got ${response.data.latestDocuments.length} document metadata`
		);

		return response.data;
	}

	public async checkConnection(): Promise<CheckConnectionResult> {
		try {
			const result = await this.ping();
			if (result.isAuthenticated) {
				return {
					isSuccessful: true,
					message: `Successfully connected to server (version: ${result.serverVersion}) and authenticated.`,
				};
			}

			return {
				isSuccessful: false,
				message: `Successfully connected to server (version: ${result.serverVersion}) but failed to authenticate.`,
			};
		} catch (e) {
			return {
				isSuccessful: false,
				message: `Failed to connect to server: ${e}`,
			};
		}
	}

	private createClient(settings: SyncSettings): void {
		this.client = createClient<paths>({
			baseUrl: settings.remoteUri,
			fetch: retriedFetch,
		});

		this.clientWithoutRetries = createClient<paths>({
			baseUrl: settings.remoteUri,
		});
	}
}