import { PrismaClient } from "@prisma/client";
import express from "express";
import { env } from "node:process";
import axios from "axios";
import { GithubClient } from "./github";
import { AppManager } from "./app_manager";
import { z } from "zod";
import { ProjectMonitor, WorkerSchema } from "./project_monitor";

const db = new PrismaClient();
const appManager = new AppManager();

const projectMonitors = new Map<number, ProjectMonitor>();

const handleProjectCreate: express.Handler = async (req, resp) => {
	try {
		const { id } = await db.project.create({
			data: {
				userId: resp.locals.userId,
				name: req.body.name,
			},
		});
		resp.status(200);
		resp.header("Content-Type", "application/json");
		resp.write(
			JSON.stringify({
				id: id.toString(),
			}),
		);
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

const handleProjectAll: express.Handler = async (req, resp) => {
	try {
		const r = await db.project.findMany({
			where: {
				userId: resp.locals.userId,
			},
		});
		resp.status(200);
		resp.header("Content-Type", "application/json");
		resp.write(
			JSON.stringify(
				r.map((p) => ({
					id: p.id.toString(),
					name: p.name,
				})),
			),
		);
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

const handleSave: express.Handler = async (req, resp) => {
	try {
		await db.project.update({
			where: {
				id: Number(req.params["projectId"]),
				userId: resp.locals.userId,
			},
			data: {
				draft: JSON.stringify(req.body),
			},
		});
		resp.status(200);
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

function handleSavedGet(state: "deploy" | "draft"): express.Handler {
	return async (req, resp) => {
		try {
			const r = await db.project.findUnique({
				where: {
					id: Number(req.params["projectId"]),
					userId: resp.locals.userId,
				},
				select: {
					state: true,
					draft: true,
				},
			});
			if (r == null) {
				resp.status(404);
				return;
			}
			resp.status(200);
			resp.header("content-type", "application/json");
			if (state === "deploy") {
				if (r.state == null) {
					resp.send({
						nodes: [],
						edges: [],
						viewport: { x: 0, y: 0, zoom: 1 },
					});
				} else {
					resp.send(JSON.parse(Buffer.from(r.state).toString("utf8")));
				}
			} else {
				if (r.draft == null) {
					if (r.state == null) {
						resp.send({
							nodes: [],
							edges: [],
							viewport: { x: 0, y: 0, zoom: 1 },
						});
					} else {
						resp.send(JSON.parse(Buffer.from(r.state).toString("utf8")));
					}
				} else {
					resp.send(JSON.parse(Buffer.from(r.draft).toString("utf8")));
				}
			}
		} catch (e) {
			console.log(e);
			resp.status(500);
		} finally {
			resp.end();
		}
	};
}

const handleDelete: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const p = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				instanceId: true,
			},
		});
		if (p === null) {
			resp.status(404);
			return;
		}
		let ok = false;
		if (p.instanceId === null) {
			ok = true;
		} else {
			ok = await appManager.removeInstance(p.instanceId);
		}
		if (ok) {
			await db.project.delete({
				where: {
					id: projectId,
				},
			});
		}
		resp.status(200);
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

function extractGithubRepos(serializedState: string | null): string[] {
	if (!serializedState) {
		return [];
	}
	try {
		const stateObj = JSON.parse(serializedState);
		const githubNodes = stateObj.nodes.filter(
			// eslint-disable-next-line @typescript-eslint/no-explicit-any
			(n: any) => n.type === "github" && n.data?.repository?.id,
		);
		// eslint-disable-next-line @typescript-eslint/no-explicit-any
		return githubNodes.map((n: any) => n.data.repository.sshURL);
	} catch (error) {
		console.error("Failed to parse state or extract GitHub repos:", error);
		return [];
	}
}

type RepoDiff = {
	toAdd?: string[];
	toDelete?: string[];
};

function calculateRepoDiff(oldRepos: string[], newRepos: string[]): RepoDiff {
	const toAdd = newRepos.filter((repo) => !oldRepos.includes(repo));
	const toDelete = oldRepos.filter((repo) => !newRepos.includes(repo));
	return { toAdd, toDelete };
}

async function manageGithubRepos(
	github: GithubClient,
	diff: RepoDiff,
	deployKey: string,
	publicAddr?: string,
): Promise<void> {
	console.log(publicAddr);
	for (const repoUrl of diff.toDelete ?? []) {
		try {
			await github.removeDeployKey(repoUrl, deployKey);
			console.log(`Removed deploy key from repository ${repoUrl}`);
			if (publicAddr) {
				const webhookCallbackUrl = `${publicAddr}/api/webhook/github/push`;
				await github.removePushWebhook(repoUrl, webhookCallbackUrl);
				console.log(`Removed push webhook from repository ${repoUrl}`);
			}
		} catch (error) {
			console.error(`Failed to remove deploy key from repository ${repoUrl}:`, error);
		}
	}
	for (const repoUrl of diff.toAdd ?? []) {
		try {
			await github.addDeployKey(repoUrl, deployKey);
			console.log(`Added deploy key to repository ${repoUrl}`);
			if (publicAddr) {
				const webhookCallbackUrl = `${publicAddr}/api/webhook/github/push`;
				await github.addPushWebhook(repoUrl, webhookCallbackUrl);
				console.log(`Added push webhook to repository ${repoUrl}`);
			}
		} catch (error) {
			console.error(`Failed to add deploy key from repository ${repoUrl}:`, error);
		}
	}
}

const handleDeploy: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const state = JSON.stringify(req.body.state);
		const p = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				instanceId: true,
				githubToken: true,
				deployKey: true,
				state: true,
			},
		});
		if (p === null) {
			resp.status(404);
			return;
		}
		await db.project.update({
			where: {
				id: projectId,
			},
			data: {
				draft: state,
			},
		});
		let diff: RepoDiff | null = null;
		let deployKey: string | null = null;
		try {
			if (p.instanceId == null) {
				const deployResponse = await appManager.deploy(req.body.config);
				await db.project.update({
					where: {
						id: projectId,
					},
					data: {
						state,
						draft: null,
						instanceId: deployResponse.id,
						deployKey: deployResponse.deployKey,
						access: JSON.stringify(deployResponse.access),
					},
				});
				diff = { toAdd: extractGithubRepos(state) };
				deployKey = deployResponse.deployKey;
			} else {
				const deployResponse = await appManager.update(p.instanceId, req.body.config);
				diff = calculateRepoDiff(extractGithubRepos(p.state), extractGithubRepos(state));
				deployKey = p.deployKey;
				await db.project.update({
					where: {
						id: projectId,
					},
					data: {
						state,
						draft: null,
						access: JSON.stringify(deployResponse.access),
					},
				});
			}
			if (diff && p.githubToken && deployKey) {
				const github = new GithubClient(p.githubToken);
				await manageGithubRepos(github, diff, deployKey, env.PUBLIC_ADDR);
			}
			resp.status(200);
		} catch (error) {
			console.error("Deployment error:", error);
			resp.status(500);
			resp.write(JSON.stringify({ error: "Deployment failed" }));
		}
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

const handleStatus: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const p = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				instanceId: true,
			},
		});
		if (p === null) {
			resp.status(404);
			return;
		}
		if (p.instanceId == null) {
			resp.status(404);
			return;
		}
		try {
			const status = await appManager.getStatus(p.instanceId);
			resp.status(200);
			resp.write(JSON.stringify(status));
		} catch (error) {
			console.error("Error getting status:", error);
			resp.status(500);
		}
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

const handleRemoveDeployment: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const p = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				instanceId: true,
				githubToken: true,
				deployKey: true,
				state: true,
				draft: true,
			},
		});
		if (p === null) {
			resp.status(404);
			resp.write(JSON.stringify({ error: "Project not found" }));
			return;
		}
		if (p.instanceId == null) {
			resp.status(400);
			resp.write(JSON.stringify({ error: "Project not deployed" }));
			return;
		}
		const removed = await appManager.removeInstance(p.instanceId);
		if (!removed) {
			resp.status(500);
			resp.write(JSON.stringify({ error: "Failed to remove deployment from cluster" }));
			return;
		}
		if (p.githubToken && p.deployKey && p.state) {
			try {
				const github = new GithubClient(p.githubToken);
				const repos = extractGithubRepos(p.state);
				const diff = { toDelete: repos, toAdd: [] };
				await manageGithubRepos(github, diff, p.deployKey, env.PUBLIC_ADDR);
			} catch (error) {
				console.error("Error removing GitHub deploy keys:", error);
			}
		}
		await db.project.update({
			where: {
				id: projectId,
			},
			data: {
				instanceId: null,
				deployKey: null,
				access: null,
				state: null,
				draft: p.draft ?? p.state,
			},
		});
		resp.status(200);
		resp.write(JSON.stringify({ success: true }));
	} catch (e) {
		console.error("Error removing deployment:", e);
		resp.status(500);
		resp.write(JSON.stringify({ error: "Internal server error" }));
	} finally {
		resp.end();
	}
};

const handleGithubRepos: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const project = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				githubToken: true,
			},
		});
		if (!project?.githubToken) {
			resp.status(400);
			resp.write(JSON.stringify({ error: "GitHub token not configured" }));
			return;
		}
		const github = new GithubClient(project.githubToken);
		const repositories = await github.getRepositories();
		resp.status(200);
		resp.header("Content-Type", "application/json");
		resp.write(JSON.stringify(repositories));
	} catch (e) {
		console.log(e);
		resp.status(500);
		resp.write(JSON.stringify({ error: "Failed to fetch repositories" }));
	} finally {
		resp.end();
	}
};

const handleUpdateGithubToken: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const { githubToken } = req.body;
		await db.project.update({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			data: { githubToken },
		});
		resp.status(200);
	} catch (e) {
		console.log(e);
		resp.status(500);
	} finally {
		resp.end();
	}
};

const handleEnv: express.Handler = async (req, resp) => {
	const projectId = Number(req.params["projectId"]);
	try {
		const project = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: {
				deployKey: true,
				githubToken: true,
				access: true,
			},
		});
		if (!project) {
			resp.status(404);
			resp.write(JSON.stringify({ error: "Project not found" }));
			return;
		}
		const monitor = projectMonitors.get(projectId);
		const serviceNames = monitor ? monitor.getAllServiceNames() : [];
		const services = serviceNames.map((name) => ({
			name,
			workers: [...(monitor ? monitor.getWorkerStatusesForService(name) : new Map()).entries()].map(
				([id, status]) => ({
					...status,
					id,
				}),
			),
		}));

		resp.status(200);
		resp.write(
			JSON.stringify({
				managerAddr: env.INTERNAL_API_ADDR,
				deployKey: project.deployKey,
				access: JSON.parse(project.access ?? "[]"),
				integrations: {
					github: !!project.githubToken,
				},
				networks: [
					{
						name: "Trial",
						domain: "trial.dodoapp.xyz",
						hasAuth: false,
					},
					// TODO(gio): Remove
				].concat(
					resp.locals.username !== "gio"
						? []
						: [
								{
									name: "Public",
									domain: "v1.dodo.cloud",
									hasAuth: true,
								},
								{
									name: "Private",
									domain: "p.v1.dodo.cloud",
									hasAuth: true,
								},
							],
				),
				services,
				user: {
					id: resp.locals.userId,
					username: resp.locals.username,
				},
			}),
		);
	} catch (error) {
		console.error("Error checking integrations:", error);
		resp.status(500);
		resp.write(JSON.stringify({ error: "Internal server error" }));
	} finally {
		resp.end();
	}
};

const handleServiceLogs: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const service = req.params["service"];
		const workerId = req.params["workerId"];
		const project = await db.project.findUnique({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
		});
		if (project == null) {
			resp.status(404);
			resp.write(JSON.stringify({ error: "Project not found" }));
			return;
		}
		const monitor = projectMonitors.get(projectId);
		if (!monitor || !monitor.hasLogs()) {
			resp.status(404);
			resp.write(JSON.stringify({ error: "No logs found for this project" }));
			return;
		}
		const serviceLog = monitor.getWorkerLog(service, workerId);
		if (!serviceLog) {
			resp.status(404);
			resp.write(JSON.stringify({ error: "No logs found for this service/worker" }));
			return;
		}
		resp.status(200);
		resp.write(JSON.stringify({ logs: serviceLog }));
	} catch (e) {
		console.log(e);
		resp.status(500);
		resp.write(JSON.stringify({ error: "Failed to get service logs" }));
	} finally {
		resp.end();
	}
};

const handleRegisterWorker: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const result = WorkerSchema.safeParse(req.body);
		if (!result.success) {
			resp.status(400);
			resp.write(
				JSON.stringify({
					error: "Invalid request data",
					details: result.error.format(),
				}),
			);
			return;
		}
		let monitor = projectMonitors.get(projectId);
		if (!monitor) {
			monitor = new ProjectMonitor();
			projectMonitors.set(projectId, monitor);
		}
		monitor.registerWorker(result.data);
		resp.status(200);
		resp.write(
			JSON.stringify({
				success: true,
			}),
		);
	} catch (e) {
		console.log(e);
		resp.status(500);
		resp.write(JSON.stringify({ error: "Failed to register worker" }));
	} finally {
		resp.end();
	}
};

async function reloadProject(projectId: number): Promise<boolean> {
	const monitor = projectMonitors.get(projectId);
	const projectWorkers = monitor ? monitor.getWorkerAddresses() : [];
	const workerCount = projectWorkers.length;
	if (workerCount === 0) {
		return true;
	}
	const results = await Promise.all(
		projectWorkers.map(async (workerAddress) => {
			const resp = await axios.post(`${workerAddress}/update`);
			return resp.status === 200;
		}),
	);
	return results.reduce((acc, curr) => acc && curr, true);
}

const handleReload: express.Handler = async (req, resp) => {
	try {
		const projectId = Number(req.params["projectId"]);
		const projectAuth = await db.project.findFirst({
			where: {
				id: projectId,
				userId: resp.locals.userId,
			},
			select: { id: true },
		});
		if (!projectAuth) {
			resp.status(404);
			return;
		}
		const success = await reloadProject(projectId);
		if (success) {
			resp.status(200);
		} else {
			resp.status(500);
		}
	} catch (e) {
		console.error(e);
		resp.status(500);
	}
};

const handleReloadWorker: express.Handler = async (req, resp) => {
	const projectId = Number(req.params["projectId"]);
	const serviceName = req.params["serviceName"];
	const workerId = req.params["workerId"];

	const projectMonitor = projectMonitors.get(projectId);
	if (!projectMonitor) {
		resp.status(404).send({ error: "Project monitor not found" });
		return;
	}

	try {
		await projectMonitor.reloadWorker(serviceName, workerId);
		resp.status(200).send({ message: "Worker reload initiated" });
	} catch (error) {
		console.error(`Failed to reload worker ${workerId} in service ${serviceName} for project ${projectId}:`, error);
		const errorMessage = error instanceof Error ? error.message : "Unknown error";
		resp.status(500).send({ error: `Failed to reload worker: ${errorMessage}` });
	}
};

const auth = (req: express.Request, resp: express.Response, next: express.NextFunction) => {
	const userId = req.get("x-forwarded-userid");
	const username = req.get("x-forwarded-user");
	if (userId == null || username == null) {
		resp.status(401);
		resp.write("Unauthorized");
		resp.end();
		return;
	}
	resp.locals.userId = userId;
	resp.locals.username = username;
	next();
};

const handleGithubPushWebhook: express.Handler = async (req, resp) => {
	try {
		// TODO(gio): Implement GitHub signature verification for security
		const webhookSchema = z.object({
			repository: z.object({
				ssh_url: z.string(),
			}),
		});

		const result = webhookSchema.safeParse(req.body);
		if (!result.success) {
			console.warn("GitHub webhook: Invalid payload:", result.error.issues);
			resp.status(400).json({ error: "Invalid webhook payload" });
			return;
		}
		const { ssh_url: addr } = result.data.repository;
		const allProjects = await db.project.findMany({
			select: {
				id: true,
				state: true,
			},
			where: {
				instanceId: {
					not: null,
				},
			},
		});
		// TODO(gio): This should run in background
		new Promise<boolean>((resolve, reject) => {
			setTimeout(() => {
				const projectsToReloadIds: number[] = [];
				for (const project of allProjects) {
					if (project.state && project.state.length > 0) {
						const projectRepos = extractGithubRepos(project.state);
						if (projectRepos.includes(addr)) {
							projectsToReloadIds.push(project.id);
						}
					}
				}
				Promise.all(projectsToReloadIds.map((id) => reloadProject(id)))
					.then((results) => {
						resolve(results.reduce((acc, curr) => acc && curr, true));
					})
					// eslint-disable-next-line @typescript-eslint/no-explicit-any
					.catch((reason: any) => reject(reason));
			}, 10);
		});
		// eslint-disable-next-line @typescript-eslint/no-explicit-any
	} catch (error: any) {
		console.error(error);
		resp.status(500);
	}
};

async function start() {
	await db.$connect();
	const app = express();
	app.use(express.json()); // Global JSON parsing

	// Public webhook route - no auth needed
	app.post("/api/webhook/github/push", handleGithubPushWebhook);

	// Authenticated project routes
	const projectRouter = express.Router();
	projectRouter.use(auth); // Apply auth middleware to this router
	projectRouter.post("/:projectId/saved", handleSave);
	projectRouter.get("/:projectId/saved/deploy", handleSavedGet("deploy"));
	projectRouter.get("/:projectId/saved/draft", handleSavedGet("draft"));
	projectRouter.post("/:projectId/deploy", handleDeploy);
	projectRouter.get("/:projectId/status", handleStatus);
	projectRouter.delete("/:projectId", handleDelete);
	projectRouter.get("/:projectId/repos/github", handleGithubRepos);
	projectRouter.post("/:projectId/github-token", handleUpdateGithubToken);
	projectRouter.get("/:projectId/env", handleEnv);
	projectRouter.post("/:projectId/reload/:serviceName/:workerId", handleReloadWorker);
	projectRouter.post("/:projectId/reload", handleReload);
	projectRouter.get("/:projectId/logs/:service/:workerId", handleServiceLogs);
	projectRouter.post("/:projectId/remove-deployment", handleRemoveDeployment);
	projectRouter.get("/", handleProjectAll);
	projectRouter.post("/", handleProjectCreate);

	app.use("/api/project", projectRouter); // Mount the authenticated router

	app.use("/", express.static("../front/dist"));

	const internalApi = express();
	internalApi.use(express.json());
	internalApi.post("/api/project/:projectId/workers", handleRegisterWorker);

	app.listen(env.DODO_PORT_WEB, () => {
		console.log("Web server started on port", env.DODO_PORT_WEB);
	});

	internalApi.listen(env.DODO_PORT_API, () => {
		console.log("Internal API server started on port", env.DODO_PORT_API);
	});
}

start();