import { unlink } from "node:fs/promises";
import { join } from "node:path";
import { zValidator } from "@hono/zod-validator";
import { Hono } from "hono";
import {
	createCandidateSchema,
	createThreadSchema,
	reorderCandidatesSchema,
	resolveThreadSchema,
	updateCandidateSchema,
	updateThreadSchema,
} from "../../shared/schemas.ts";
import { parseId } from "../lib/params.ts";
import {
	createCandidate,
	createThread,
	deleteCandidate,
	deleteThread,
	getAllThreads,
	getThreadWithCandidates,
	reorderCandidates,
	resolveThread,
	updateCandidate,
	updateThread,
} from "../services/thread.service.ts";

type Env = { Variables: { db?: any } };

const app = new Hono<Env>();

// Thread CRUD

app.get("/", (c) => {
	const db = c.get("db");
	const includeResolved = c.req.query("includeResolved") === "true";
	const threads = getAllThreads(db, includeResolved);
	return c.json(threads);
});

app.post("/", zValidator("json", createThreadSchema), (c) => {
	const db = c.get("db");
	const data = c.req.valid("json");
	const thread = createThread(db, data);
	return c.json(thread, 201);
});

app.get("/:id", (c) => {
	const db = c.get("db");
	const id = parseId(c.req.param("id"));
	if (!id) return c.json({ error: "Invalid thread ID" }, 400);
	const thread = getThreadWithCandidates(db, id);
	if (!thread) return c.json({ error: "Thread not found" }, 404);
	return c.json(thread);
});

app.put("/:id", zValidator("json", updateThreadSchema), (c) => {
	const db = c.get("db");
	const id = parseId(c.req.param("id"));
	if (!id) return c.json({ error: "Invalid thread ID" }, 400);
	const data = c.req.valid("json");
	const thread = updateThread(db, id, data);
	if (!thread) return c.json({ error: "Thread not found" }, 404);
	return c.json(thread);
});

app.delete("/:id", async (c) => {
	const db = c.get("db");
	const id = parseId(c.req.param("id"));
	if (!id) return c.json({ error: "Invalid thread ID" }, 400);
	const deleted = deleteThread(db, id);
	if (!deleted) return c.json({ error: "Thread not found" }, 404);

	// Clean up candidate image files
	for (const filename of deleted.candidateImages) {
		try {
			await unlink(join("uploads", filename));
		} catch {
			// File missing is not an error worth failing the delete over
		}
	}

	return c.json({ success: true });
});

// Candidate CRUD (nested under thread)

app.post("/:id/candidates", zValidator("json", createCandidateSchema), (c) => {
	const db = c.get("db");
	const threadId = parseId(c.req.param("id"));
	if (!threadId) return c.json({ error: "Invalid thread ID" }, 400);

	// Verify thread exists
	const thread = getThreadWithCandidates(db, threadId);
	if (!thread) return c.json({ error: "Thread not found" }, 404);

	const data = c.req.valid("json");
	const candidate = createCandidate(db, threadId, data);
	return c.json(candidate, 201);
});

app.put(
	"/:threadId/candidates/:candidateId",
	zValidator("json", updateCandidateSchema),
	(c) => {
		const db = c.get("db");
		const candidateId = parseId(c.req.param("candidateId"));
		if (!candidateId) return c.json({ error: "Invalid candidate ID" }, 400);
		const data = c.req.valid("json");
		const candidate = updateCandidate(db, candidateId, data);
		if (!candidate) return c.json({ error: "Candidate not found" }, 404);
		return c.json(candidate);
	},
);

app.delete("/:threadId/candidates/:candidateId", async (c) => {
	const db = c.get("db");
	const candidateId = parseId(c.req.param("candidateId"));
	if (!candidateId) return c.json({ error: "Invalid candidate ID" }, 400);
	const deleted = deleteCandidate(db, candidateId);
	if (!deleted) return c.json({ error: "Candidate not found" }, 404);

	// Clean up image file if exists
	if (deleted.imageFilename) {
		try {
			await unlink(join("uploads", deleted.imageFilename));
		} catch {
			// File missing is not an error
		}
	}

	return c.json({ success: true });
});

// Candidate reorder

app.patch(
	"/:id/candidates/reorder",
	zValidator("json", reorderCandidatesSchema),
	(c) => {
		const db = c.get("db");
		const threadId = parseId(c.req.param("id"));
		if (!threadId) return c.json({ error: "Invalid thread ID" }, 400);
		const { orderedIds } = c.req.valid("json");
		const result = reorderCandidates(db, threadId, orderedIds);
		if (!result.success) return c.json({ error: result.error }, 400);
		return c.json({ success: true });
	},
);

// Resolution

app.post("/:id/resolve", zValidator("json", resolveThreadSchema), (c) => {
	const db = c.get("db");
	const threadId = parseId(c.req.param("id"));
	if (!threadId) return c.json({ error: "Invalid thread ID" }, 400);
	const { candidateId } = c.req.valid("json");

	const result = resolveThread(db, threadId, candidateId);
	if (!result.success) {
		return c.json({ error: result.error }, 400);
	}

	return c.json({ success: true, item: result.item });
});

export { app as threadRoutes };