import { Utils, type BrowserWindow } from "electrobun/bun";
import { BRANDING } from "../shared/branding";
import type { EditorOpenContext } from "../shared/rpc";
import type { AppSettings } from "../shared/types";
import { writeFileText, type EditManager } from "./edits";
import type { SessionRegistry } from "./fs/registry";
import { createEditorRPC } from "./rpc-handlers";
import { openSecondaryWindow, WindowRegistry } from "./windows";
import type { SettingsStore } from "./store/settings";

const EDITOR_WIDTH = 900;
const EDITOR_HEIGHT = 680;

interface EditorRecord {
	win: BrowserWindow;
	ctx: EditorOpenContext;
	dirty: boolean;
	/** Last mirrored content — what the native-close Save fallback writes. */
	draft: string | null;
	/** Set by editorClose: the webview already resolved its dirty prompt. */
	suppressPrompt: boolean;
	rpc: ReturnType<typeof createEditorRPC>;
}

export interface EditorWindowsDeps {
	registry: SessionRegistry;
	settings: SettingsStore;
	edits: EditManager;
	/** The once-resolved dev/prod view url. */
	url: string;
	mainFrame: () => { x: number; y: number };
	/** Late-bound senders targeting the MAIN window's webview. */
	notifyMain: { pathRefresh: (info: { sessionId: string; dir: string }) => void };
}

/**
 * One native window per edited file (key: sessionId+path). The webview owns
 * the styled dirty prompt for closes it can see (⌘W, Close button); the
 * native traffic-light close is NOT cancellable in electrobun, so the draft
 * mirrored via editorState lets us offer a native Save/Discard box after the
 * window is already gone. A failed fallback save parks the draft in the
 * edits leftovers dir (offered back at next boot).
 */
export class EditorWindows {
	private windows: WindowRegistry<EditorRecord>;

	constructor(private deps: EditorWindowsDeps) {
		this.windows = new WindowRegistry(deps.mainFrame);
	}

	open(ctx: EditorOpenContext): void {
		const key = `${ctx.sessionId} ${ctx.path}`;
		if (this.windows.activateExisting(key)) return;

		const record: Partial<EditorRecord> = { ctx, dirty: false, draft: null, suppressPrompt: false };
		const rpc = createEditorRPC(
			{ registry: this.deps.registry, settings: this.deps.settings },
			{
				ctx,
				onDraft: (state) => {
					record.dirty = state.dirty;
					record.draft = state.content;
					this.setDirtyTitle(record as EditorRecord);
				},
				onSaved: () => {
					record.dirty = false;
					record.draft = null;
					this.setDirtyTitle(record as EditorRecord);
					this.deps.notifyMain.pathRefresh({
						sessionId: ctx.sessionId,
						dir: this.dirOf(ctx),
					});
				},
				onCloseConfirmed: () => {
					record.suppressPrompt = true;
					record.win?.close();
				},
			},
		);

		const win = openSecondaryWindow({
			title: this.baseTitle(ctx),
			url: this.deps.url,
			mode: "editor",
			ctx,
			frame: this.windows.nextFrame(EDITOR_WIDTH, EDITOR_HEIGHT),
			rpc,
		});
		record.win = win;
		record.rpc = rpc;
		this.windows.set(key, record as EditorRecord);
		this.windows.track(key, win, (k) => void this.handleNativeClose(k));
		console.log(`[editor] opened window for ${ctx.sessionId}:${ctx.path}`);
	}

	/** The window is already gone; decide the draft's fate from what we hold. */
	private async handleNativeClose(key: string): Promise<void> {
		const record = this.windows.get(key);
		this.windows.delete(key);
		if (!record || !record.dirty || record.suppressPrompt || record.draft === null) return;

		const { ctx, draft } = record;
		const { response } = await Utils.showMessageBox({
			type: "warning",
			title: BRANDING.appName,
			message: `Save changes to "${ctx.name}"?`,
			detail: "The editor window was closed with unsaved changes.",
			buttons: ["Save", "Discard"],
			defaultId: 0,
			cancelId: 1,
		});
		if (response !== 0) return;
		try {
			await writeFileText(this.deps.registry.get(ctx.sessionId), ctx.path, draft);
			this.deps.notifyMain.pathRefresh({ sessionId: ctx.sessionId, dir: this.dirOf(ctx) });
		} catch (error) {
			await this.deps.edits.rescueDraft(ctx.name, draft);
			await Utils.showMessageBox({
				type: "error",
				title: BRANDING.appName,
				message: `Couldn't save "${ctx.name}".`,
				detail: `${error instanceof Error ? error.message : error}\n\nA local copy was kept and will be offered at the next launch.`,
				buttons: ["OK"],
				defaultId: 0,
				cancelId: 0,
			});
		}
	}

	dirtyCount(): number {
		let count = 0;
		this.windows.forEach((rec) => {
			if (rec.dirty) count++;
		});
		return count;
	}

	anyFocused(): boolean {
		return this.windows.anyFocused();
	}

	focusedKey(): string | null {
		return this.windows.focusedKey();
	}

	/** Ask a window to run its styled close flow (⌘W routing, main close). */
	requestClose(key: string): void {
		this.windows.get(key)?.rpc.send.editorCloseRequest({});
	}

	/** Main window closed: clean editors just close, dirty ones get to ask. */
	closeAllForAppExit(): void {
		this.windows.forEach((rec, key) => {
			if (rec.dirty) this.requestClose(key);
			else rec.win.close();
		});
	}

	notifySessionClosed(info: { sessionId: string; reason: string }): void {
		this.windows.forEach((rec) => {
			if (rec.ctx.sessionId === info.sessionId) rec.rpc.send.sessionClosed(info);
		});
	}

	broadcastSettings(settings: AppSettings): void {
		this.windows.forEach((rec) => rec.rpc.send.settingsChanged({ settings }));
	}

	private baseTitle(ctx: EditorOpenContext): string {
		return `${ctx.name} — ${ctx.sessionTitle}`;
	}

	private setDirtyTitle(record: EditorRecord): void {
		record.win.setTitle(`${record.dirty ? "• " : ""}${this.baseTitle(record.ctx)}`);
	}

	private dirOf(ctx: EditorOpenContext): string {
		return this.deps.registry.get(ctx.sessionId).dirname(ctx.path);
	}
}