import type { AxiosInstance } from "axios";
import * as JSZip from "jszip";
import * as path from "node:path";
import { Roborock } from "../main";

export class AppPluginManager {
	adapter: Roborock;

	constructor(adapter: Roborock) {
		this.adapter = adapter;
	}

	public async downloadAppPlugins(): Promise<void> {
		const loginApi = this.adapter.http_api.loginApi;
		if (!loginApi) {
			this.adapter.rLog("System", null, "Error", undefined, undefined, "loginApi not initialized in AppPluginManager", "error");
			return;
		}

		try {
			// Ensure we have V5 product info (numeric IDs)
			await this.adapter.http_api.ensureProductInfo();

			// Future: Integrate automated plugin discovery and background updates
		} catch (e: unknown) {
			this.adapter.rLog("System", null, "Error", undefined, undefined, `Failed to prepare for app plugin download: ${this.adapter.errorMessage(e)}`, "error");
			return;
		}
	}

	private static readonly ASSETS_BASE = "assets";

	private async hasAssetsForModel(model: string): Promise<boolean> {
		if (!model || model === "default") return true;
		const versionFilePath = `${AppPluginManager.ASSETS_BASE}/${model}/version`;
		try {
			return await this.adapter.fileExistsAsync(this.adapter.name, versionFilePath);
		} catch {
			return false;
		}
	}

	/** Download assets for model if version file missing (startup only). */
	public async downloadAssetsForModelIfMissing(model: string): Promise<void> {
		if (!model || model === "default") return;
		if (await this.hasAssetsForModel(model)) return;

		const loginApi = this.adapter.http_api.loginApi;
		if (!loginApi) return;

		const devices = this.adapter.http_api.getDevices() || [];
		const deviceWithModel = devices.find(d => this.adapter.http_api.getRobotModel(d.duid) === model);
		if (deviceWithModel) {
			await this.updateProduct(deviceWithModel.duid);
			return;
		}

		await this.adapter.http_api.ensureProductInfo();
		const numericProductId = this.adapter.http_api.getProductIdByModel(model) || 0;
		if (numericProductId <= 0) return;

		const appPluginRequest = { apilevel: 10042, type: 2, productids: [numericProductId] };
		const vacuumIDs: Record<string, string> = { [numericProductId.toString()]: model };

		try {
			const packageData = await loginApi.post("api/v1/appplugin", appPluginRequest);
			if (packageData.data.code !== 200) return;

			const packages = packageData.data.data;
			for (const rr_package in packages) {
				let vacuumModel = vacuumIDs[packages[rr_package].productid];
				if (!vacuumModel) vacuumModel = model;
				if (vacuumModel !== model) continue;

				const zipUrl = packages[rr_package].url;
				const newVersion = packages[rr_package].version;
				await this.downloadAndExtractAssetZip(loginApi, zipUrl, vacuumModel, newVersion, null);
				return;
			}
		} catch {
			// ignore
		}
	}

	private async downloadAndExtractAssetZip(
		loginApi: AxiosInstance,
		zipUrl: string,
		vacuumModel: string,
		newVersion: string,
		duid: string | null
	): Promise<boolean> {
		const assetDir = `${AppPluginManager.ASSETS_BASE}/${vacuumModel}`;
		const versionFilePath = `${assetDir}/version`;

		let reason = "";
		const versionExists = await this.adapter.fileExistsAsync(this.adapter.name, versionFilePath);
		if (!versionExists) {
			try {
				await this.adapter.readDirAsync(this.adapter.name, assetDir);
				reason = "Version file missing";
			} catch {
				reason = "Assets missing";
			}
		} else {
			const versionResult = await this.adapter.readFileAsync(this.adapter.name, versionFilePath);
			const content = (typeof versionResult === "object" && versionResult !== null && "file" in versionResult)
				? (versionResult as { file: Buffer }).file.toString("utf8").trim() : String(versionResult).trim();
			const cur = parseInt(content, 10);
			const rem = parseInt(newVersion, 10);
			if (isNaN(rem) || (!isNaN(cur) && rem <= cur)) return true;
			reason = `New version (${cur} → ${rem})`;
		}

		try {
			await this.adapter.mkdirAsync(this.adapter.name, assetDir);
		} catch (e) {
			this.adapter.rLog("System", duid ?? null, "Error", undefined, undefined, `Could not create asset directory ${assetDir}: ${e}`, "error");
			return false;
		}

		this.adapter.rLog("Cloud", duid ?? null, "Info", undefined, undefined, `Downloading assets for ${vacuumModel} (${reason})...`, "info");

		try {
			const response = await loginApi.get(zipUrl, { responseType: "arraybuffer" });
			const zip = await JSZip.loadAsync(response.data);
			let extractedCount = 0;
			const filePromises: Promise<void>[] = [];
			const createdDirs = new Set<string>();

			zip.forEach((relativePath, file) => {
				const isTarget = relativePath.startsWith("drawable-") || relativePath.startsWith("raw/");
				if (isTarget && !file.dir) {
					filePromises.push((async () => {
						const fileContent = await file.async("nodebuffer");
						if (fileContent) {
							const targetPath = `${assetDir}/${relativePath}`;
							const targetDir = path.dirname(targetPath).replace(/\\/g, "/");
							if (!createdDirs.has(targetDir)) {
								createdDirs.add(targetDir);
								await this.adapter.mkdirAsync(this.adapter.name, targetDir);
							}
							await this.adapter.writeFileAsync(this.adapter.name, targetPath, fileContent as Buffer);
							extractedCount++;
						}
					})());
				}
			});

			await Promise.all(filePromises);

			if (extractedCount > 0) {
				this.adapter.rLog("Cloud", duid ?? null, "Info", undefined, undefined, `Extracted ${extractedCount} assets to ${assetDir}`, "info");
				try {
					const versionBuf = Buffer.from(String(newVersion), "utf8");
					await this.adapter.writeFileAsync(this.adapter.name, versionFilePath, versionBuf);
				} catch (e: unknown) {
					this.adapter.rLog("Cloud", duid ?? null, "Error", undefined, undefined, `Failed to write version file ${versionFilePath}: ${this.adapter.errorMessage(e)}`, "error");
					return false;
				}
				return true;
			}
			this.adapter.rLog("Cloud", duid ?? null, "Warn", undefined, undefined, `No assets found in zip for ${vacuumModel}.`, "warn");
		} catch (err: unknown) {
			this.adapter.rLog("Cloud", duid ?? null, "Error", undefined, undefined, `Failed to download/extract assets for ${vacuumModel}: ${this.adapter.errorMessage(err)}`, "error");
		}
		return false;
	}

	async updateProduct(duid: string) {
		const loginApi = this.adapter.http_api.loginApi;
		if (!loginApi) {
			this.adapter.rLog("System", null, "Error", undefined, undefined, "loginApi not initialized in AppPluginManager", "error");
			return;
		}

		const devices = this.adapter.http_api.getDevices();
		const device = devices.find(d => d.duid === duid);

		if (!device) {
			this.adapter.rLog("Cloud", duid, "Warn", undefined, undefined, "Cannot update product assets: Device not found.", "warn");
			return;
		}

		const appPluginRequest: any = { apilevel: 1000, type: 2 };
		let numericProductId = 0;
		await this.adapter.http_api.ensureProductInfo();

		let vacuumModel = "unknown_model";
		const modelStr = this.adapter.http_api.getRobotModel(duid);
		if (modelStr) vacuumModel = modelStr;

		const resolvedId = this.adapter.http_api.getProductIdByModel(vacuumModel);

		if (resolvedId) {
			numericProductId = resolvedId;
		} else {
			const productInfo = this.adapter.http_api.productInfo;
			const hasV3 = !!(this.adapter.http_api.homeData && this.adapter.http_api.homeData.products);
			const hasV5 = !!(productInfo && productInfo.data);

			let v5Count = 0;
			if (productInfo?.data?.categoryDetailList) {
				for (const c of productInfo.data.categoryDetailList) {
					if (c.productList) v5Count += c.productList.length;
				}
			}
			const v5List = `V5Products(${v5Count})`;

			this.adapter.rLog("Cloud", duid, "Warn", undefined, undefined, `Could not find numeric ID for ${vacuumModel}. V3Products: ${hasV3}, V5Data: ${hasV5}, V5Counts: ${v5List}`, "warn");
		}

		if (numericProductId > 0) {
			appPluginRequest.productids = [numericProductId];
			appPluginRequest.apilevel = 10042;
		} else {
			this.adapter.rLog("Cloud", duid, "Warn", undefined, undefined, `Falling back to request with string productId ${device.productId} (might fail)`, "warn");
		}

		const vacuumIDs: Record<string, string> = {
			[device.productId]: vacuumModel,
			[numericProductId.toString()]: vacuumModel
		};

		try {
			const packageData = await loginApi.post("api/v1/appplugin", appPluginRequest);

			if (packageData.data.code !== 200) {
				this.adapter.rLog("Cloud", duid, "Warn", undefined, undefined, `AppPlugin (assets) request failed: ${JSON.stringify(packageData.data)}`, "warn");
				return;
			}

			const packages = packageData.data.data;
			const processedModels = new Set<string>();
			for (const rr_package in packages) {
				let vacuumModel = vacuumIDs[packages[rr_package].productid];
				if (!vacuumModel) vacuumModel = "unknown";
				if (vacuumModel === "unknown_model" || !vacuumModel) {
					const pid = packages[rr_package].productid;
					if (pid == numericProductId || pid == device.productId) vacuumModel = modelStr || "unknown";
				}
				if (!vacuumModel || vacuumModel === "unknown" || processedModels.has(vacuumModel)) continue;
				processedModels.add(vacuumModel);

				// Skip if another caller already downloaded (e.g. single-flight finished)
				if (await this.hasAssetsForModel(vacuumModel)) continue;

				const zipUrl = packages[rr_package].url;
				const newVersion = packages[rr_package].version;
				await this.downloadAndExtractAssetZip(loginApi, zipUrl, vacuumModel, newVersion, duid);
			}
		} catch (e: unknown) {
			this.adapter.rLog("Cloud", duid, "Error", undefined, undefined, `Failed to update product assets: ${this.adapter.errorMessage(e)}`, "error");
		}
	}
}