// *************************************************************************
// * (C)opyright 2026         by Ruben Carlo Benante                       *
// *                                                                       *
// * This program is free software; you can redistribute it and/or modify  *
// *  it under the terms of the GNU General Public License as published by *
// *  the Free Software Foundation, either version 3 of the License, or    *
// *  (at your option) any later version.                                  *
// *                                                                       *
// * This program is distributed in the hope that it will be useful,       *
// *  but WITHOUT ANY WARRANTY; without even the implied warranty of       *
// *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
// *  GNU General Public License for more details.                         *
// *                                                                       *
// * You should have received a copy of the GNU General Public License     *
// *  along with this program.  If not, see http://www.gnu.org/licenses/.  *
// *                                                                       *
// * Contact author at:                                                    *
// *  Ruben Carlo Benante                                                  *
// *  rcb@beco.cc                                                          *
// *************************************************************************

import { Editor, Notice, Plugin } from 'obsidian';
import { parseQualcardBlocks, selectBlockToPush } from './card';
import { getProjectIdByName, createTask } from './kanboard';
import {
	Ob2qualkardSettings,
	DEFAULT_SETTINGS,
	Ob2qualkardSettingTab,
} from './settings';

export default class Ob2qualkardPlugin extends Plugin {
	settings!: Ob2qualkardSettings;
	// Board name -> project id, resolved once per session (cleared on save).
	private boardCache = new Map<string, number>();

	async onload() {
		await this.loadSettings();
		this.addSettingTab(new Ob2qualkardSettingTab(this.app, this));

		this.addCommand({
			id: 'push-note-to-qualkard',
			name: 'Push this note to QualKard',
			editorCallback: (editor) => void this.pushNote(editor),
		});

		this.registerEvent(
			this.app.workspace.on('editor-menu', (menu, editor) => {
				menu.addItem((item) =>
					item
						.setTitle('Push this note to QualKard')
						.setIcon('upload')
						.onClick(() => void this.pushNote(editor)),
				);
			}),
		);
	}

	async loadSettings() {
		this.settings = Object.assign(
			{},
			DEFAULT_SETTINGS,
			(await this.loadData()) as Partial<Ob2qualkardSettings>,
		);
	}

	async saveSettings() {
		await this.saveData(this.settings);
		// The board name may have changed; re-resolve its id on the next push.
		this.boardCache.clear();
	}

	// Parse the note, pick the card to push (sole block, or the one under the
	// cursor), validate it, then create the Kanboard task. One-way, no dedup.
	private async pushNote(editor: Editor) {
		const sel = selectBlockToPush(
			parseQualcardBlocks(editor.getValue()),
			editor.getCursor().line,
		);
		if (sel.reason === 'none') {
			new Notice('No qualcard block in this note');
			return;
		}
		if (sel.reason === 'ambiguous') {
			new Notice(
				'Several qualcard blocks; place the cursor inside the one to push',
			);
			return;
		}
		const block = sel.block;
		if (!block || !block.front) {
			new Notice('This qualcard block has no prompt (front)');
			return;
		}
		if (!block.hasAnswer) {
			new Notice('This qualcard block has no answer, so it was skipped');
			return;
		}
		if (!this.settings.apiToken || !this.settings.board) {
			new Notice(
				'Set the API token and study board in settings first',
			);
			return;
		}
		try {
			const projectId = await this.resolveBoard();
			if (projectId === null) {
				new Notice(`Board "${this.settings.board}" not found`);
				return;
			}
			const taskId = await createTask(
				this.settings,
				projectId,
				block.front,
				block.back,
			);
			new Notice(`Card created (task #${taskId})`);
		} catch (e) {
			const msg = e instanceof Error ? e.message : 'push failed';
			console.error('ob2qualkard: push failed', e);
			new Notice(msg);
		}
	}

	private async resolveBoard(): Promise<number | null> {
		const name = this.settings.board;
		const cached = this.boardCache.get(name);
		if (cached !== undefined) return cached;
		const id = await getProjectIdByName(this.settings, name);
		if (id !== null) this.boardCache.set(name, id);
		return id;
	}
}