/**
 * Notes module — notebooks, rich-text notes, voice transcription.
 *
 * Port of rnotes-online (Next.js + Prisma → Hono + postgres.js).
 * Supports multiple note types: text, code, bookmark, audio, image, file.
 */

import { Hono } from "hono";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";
import { sql } from "../../shared/db/pool";
import { renderShell } from "../../server/shell";
import { getModuleInfoList } from "../../shared/module";
import type { RSpaceModule } from "../../shared/module";

const routes = new Hono();

// ── DB initialization ──
const SCHEMA_SQL = readFileSync(resolve(import.meta.dir, "db/schema.sql"), "utf-8");

async function initDB() {
	try {
		await sql.unsafe(SCHEMA_SQL);
		console.log("[Notes] DB schema initialized");
	} catch (e) {
		console.error("[Notes] DB init error:", e);
	}
}

initDB();

// ── Helper: get or create user ──
async function getOrCreateUser(did: string, username?: string) {
	const rows = await sql.unsafe(
		`INSERT INTO rnotes.users (did, username) VALUES ($1, $2)
		 ON CONFLICT (did) DO UPDATE SET username = COALESCE($2, rnotes.users.username)
		 RETURNING *`,
		[did, username || null]
	);
	return rows[0];
}

// ── Notebooks API ──

// GET /api/notebooks — list notebooks
routes.get("/api/notebooks", async (c) => {
	const rows = await sql.unsafe(
		`SELECT n.*, count(note.id) as note_count
		 FROM rnotes.notebooks n
		 LEFT JOIN rnotes.notes note ON note.notebook_id = n.id
		 GROUP BY n.id
		 ORDER BY n.updated_at DESC LIMIT 50`
	);
	return c.json({ notebooks: rows });
});

// POST /api/notebooks — create notebook
routes.post("/api/notebooks", async (c) => {
	const body = await c.req.json();
	const { title, description, cover_color } = body;

	const rows = await sql.unsafe(
		`INSERT INTO rnotes.notebooks (title, description, cover_color)
		 VALUES ($1, $2, $3) RETURNING *`,
		[title || "Untitled Notebook", description || null, cover_color || "#3b82f6"]
	);
	return c.json(rows[0], 201);
});

// GET /api/notebooks/:id — notebook detail with notes
routes.get("/api/notebooks/:id", async (c) => {
	const id = c.req.param("id");
	const nb = await sql.unsafe("SELECT * FROM rnotes.notebooks WHERE id = $1", [id]);
	if (nb.length === 0) return c.json({ error: "Notebook not found" }, 404);

	const notes = await sql.unsafe(
		`SELECT n.*, array_agg(t.name) FILTER (WHERE t.name IS NOT NULL) as tags
		 FROM rnotes.notes n
		 LEFT JOIN rnotes.note_tags nt ON nt.note_id = n.id
		 LEFT JOIN rnotes.tags t ON t.id = nt.tag_id
		 WHERE n.notebook_id = $1
		 GROUP BY n.id
		 ORDER BY n.is_pinned DESC, n.sort_order ASC, n.updated_at DESC`,
		[id]
	);
	return c.json({ ...nb[0], notes });
});

// PUT /api/notebooks/:id — update notebook
routes.put("/api/notebooks/:id", async (c) => {
	const id = c.req.param("id");
	const body = await c.req.json();
	const { title, description, cover_color, is_public } = body;

	const fields: string[] = [];
	const params: unknown[] = [];
	let idx = 1;

	if (title !== undefined) { fields.push(`title = $${idx}`); params.push(title); idx++; }
	if (description !== undefined) { fields.push(`description = $${idx}`); params.push(description); idx++; }
	if (cover_color !== undefined) { fields.push(`cover_color = $${idx}`); params.push(cover_color); idx++; }
	if (is_public !== undefined) { fields.push(`is_public = $${idx}`); params.push(is_public); idx++; }

	if (fields.length === 0) return c.json({ error: "No fields to update" }, 400);
	fields.push("updated_at = NOW()");
	params.push(id);

	const rows = await sql.unsafe(
		`UPDATE rnotes.notebooks SET ${fields.join(", ")} WHERE id = $${idx} RETURNING *`,
		params
	);
	if (rows.length === 0) return c.json({ error: "Notebook not found" }, 404);
	return c.json(rows[0]);
});

// DELETE /api/notebooks/:id
routes.delete("/api/notebooks/:id", async (c) => {
	const result = await sql.unsafe(
		"DELETE FROM rnotes.notebooks WHERE id = $1 RETURNING id",
		[c.req.param("id")]
	);
	if (result.length === 0) return c.json({ error: "Notebook not found" }, 404);
	return c.json({ ok: true });
});

// ── Notes API ──

// GET /api/notes — list all notes (query: notebook_id, type, q)
routes.get("/api/notes", async (c) => {
	const { notebook_id, type, q, limit = "50", offset = "0" } = c.req.query();
	const conditions: string[] = [];
	const params: unknown[] = [];
	let idx = 1;

	if (notebook_id) { conditions.push(`n.notebook_id = $${idx}`); params.push(notebook_id); idx++; }
	if (type) { conditions.push(`n.type = $${idx}`); params.push(type); idx++; }
	if (q) {
		conditions.push(`(n.title ILIKE $${idx} OR n.content_plain ILIKE $${idx})`);
		params.push(`%${q}%`);
		idx++;
	}

	const where = conditions.length > 0 ? `WHERE ${conditions.join(" AND ")}` : "";

	const rows = await sql.unsafe(
		`SELECT n.*, array_agg(t.name) FILTER (WHERE t.name IS NOT NULL) as tags
		 FROM rnotes.notes n
		 LEFT JOIN rnotes.note_tags nt ON nt.note_id = n.id
		 LEFT JOIN rnotes.tags t ON t.id = nt.tag_id
		 ${where}
		 GROUP BY n.id
		 ORDER BY n.is_pinned DESC, n.updated_at DESC
		 LIMIT ${Math.min(parseInt(limit), 100)} OFFSET ${parseInt(offset) || 0}`,
		params
	);
	return c.json({ notes: rows });
});

// POST /api/notes — create note
routes.post("/api/notes", async (c) => {
	const body = await c.req.json();
	const { notebook_id, title, content, type, url, language, file_url, mime_type, file_size, duration, tags } = body;

	if (!title?.trim()) return c.json({ error: "Title is required" }, 400);

	// Strip HTML for plain text search
	const contentPlain = content ? content.replace(/<[^>]*>/g, " ").replace(/\s+/g, " ").trim() : null;

	const rows = await sql.unsafe(
		`INSERT INTO rnotes.notes (notebook_id, title, content, content_plain, type, url, language, file_url, mime_type, file_size, duration)
		 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) RETURNING *`,
		[notebook_id || null, title.trim(), content || "", contentPlain, type || "NOTE",
		 url || null, language || null, file_url || null, mime_type || null, file_size || null, duration || null]
	);

	// Handle tags
	if (tags && Array.isArray(tags)) {
		for (const tagName of tags) {
			const name = tagName.trim().toLowerCase();
			if (!name) continue;
			const tag = await sql.unsafe(
				"INSERT INTO rnotes.tags (name) VALUES ($1) ON CONFLICT (name) DO UPDATE SET name = $1 RETURNING id",
				[name]
			);
			await sql.unsafe(
				"INSERT INTO rnotes.note_tags (note_id, tag_id) VALUES ($1, $2) ON CONFLICT DO NOTHING",
				[rows[0].id, tag[0].id]
			);
		}
	}

	return c.json(rows[0], 201);
});

// GET /api/notes/:id — note detail
routes.get("/api/notes/:id", async (c) => {
	const id = c.req.param("id");
	const rows = await sql.unsafe(
		`SELECT n.*, array_agg(t.name) FILTER (WHERE t.name IS NOT NULL) as tags
		 FROM rnotes.notes n
		 LEFT JOIN rnotes.note_tags nt ON nt.note_id = n.id
		 LEFT JOIN rnotes.tags t ON t.id = nt.tag_id
		 WHERE n.id = $1
		 GROUP BY n.id`,
		[id]
	);
	if (rows.length === 0) return c.json({ error: "Note not found" }, 404);
	return c.json(rows[0]);
});

// PUT /api/notes/:id — update note
routes.put("/api/notes/:id", async (c) => {
	const id = c.req.param("id");
	const body = await c.req.json();
	const { title, content, type, url, language, is_pinned, sort_order } = body;

	const fields: string[] = [];
	const params: unknown[] = [];
	let idx = 1;

	if (title !== undefined) { fields.push(`title = $${idx}`); params.push(title); idx++; }
	if (content !== undefined) {
		fields.push(`content = $${idx}`); params.push(content); idx++;
		const plain = content.replace(/<[^>]*>/g, " ").replace(/\s+/g, " ").trim();
		fields.push(`content_plain = $${idx}`); params.push(plain); idx++;
	}
	if (type !== undefined) { fields.push(`type = $${idx}`); params.push(type); idx++; }
	if (url !== undefined) { fields.push(`url = $${idx}`); params.push(url); idx++; }
	if (language !== undefined) { fields.push(`language = $${idx}`); params.push(language); idx++; }
	if (is_pinned !== undefined) { fields.push(`is_pinned = $${idx}`); params.push(is_pinned); idx++; }
	if (sort_order !== undefined) { fields.push(`sort_order = $${idx}`); params.push(sort_order); idx++; }

	if (fields.length === 0) return c.json({ error: "No fields to update" }, 400);
	fields.push("updated_at = NOW()");
	params.push(id);

	const rows = await sql.unsafe(
		`UPDATE rnotes.notes SET ${fields.join(", ")} WHERE id = $${idx} RETURNING *`,
		params
	);
	if (rows.length === 0) return c.json({ error: "Note not found" }, 404);
	return c.json(rows[0]);
});

// DELETE /api/notes/:id
routes.delete("/api/notes/:id", async (c) => {
	const result = await sql.unsafe("DELETE FROM rnotes.notes WHERE id = $1 RETURNING id", [c.req.param("id")]);
	if (result.length === 0) return c.json({ error: "Note not found" }, 404);
	return c.json({ ok: true });
});

// ── Page route ──
routes.get("/", (c) => {
	const space = c.req.param("space") || "demo";
	return c.html(renderShell({
		title: `${space} — Notes | rSpace`,
		moduleId: "notes",
		spaceSlug: space,
		modules: getModuleInfoList(),
		theme: "light",
		styles: `<link rel="stylesheet" href="/modules/notes/notes.css">`,
		body: `<folk-notes-app space="${space}"></folk-notes-app>`,
		scripts: `<script type="module" src="/modules/notes/folk-notes-app.js"></script>`,
	}));
});

export const notesModule: RSpaceModule = {
	id: "notes",
	name: "rNotes",
	icon: "\u{1F4DD}",
	description: "Notebooks with rich-text notes, voice transcription, and collaboration",
	routes,
	standaloneDomain: "rnotes.online",
};