SubMiner/backlog/tasks/task-8 - Reduce-MpvIpcClient-deps-interface-and-separate-protocol-from-application-logic.md

id, title, status, assignee, created_date, labels, milestone, dependencies, references, priority

id	title	status	assignee	created_date	labels	milestone	dependencies	references	priority
TASK-8	Reduce MpvIpcClient deps interface and separate protocol from application logic	To Do		2026-02-11 08:20	refactor mpv architecture	Codebase Clarity & Composability		src/core/services/mpv-service.ts	medium

Description

MpvIpcClient (761 lines) in src/core/services/mpv-service.ts has a 22-property MpvIpcClientDeps interface that reaches back into main.ts state for application-level concerns (overlay visibility, subtitle timing, media path updates, OSD display).

The class mixes two responsibilities:

1. IPC Protocol: Socket connection, JSON message framing, reconnection, property observation
2. Application Integration: Subtitle text broadcasting, overlay visibility sync, timing tracking

Separating these would let the protocol layer be simpler and testable, while application-level reactions to mpv events could be handled by listeners/callbacks registered externally.

Acceptance Criteria

• #1 MpvIpcClient deps interface reduced to protocol-level concerns only
• #2 Application-level reactions (subtitle broadcast, overlay sync, timing) handled via event emitter or external listeners
• #3 MpvIpcClient is testable without mocking 22 callbacks
• #4 Existing behavior preserved