// KeymapService — 快捷键绑定管理 + 冲突检测（FR-K3/K4/K5）
export type Scope = 'global' | 'app' | 'editor';
export interface Binding { id: string; scope: Scope; combo: string; defaultCombo: string; }

export class KeymapService {
  private bindings = new Map<string, Binding>();

  register(b: Binding) { this.bindings.set(b.id, b); }
  setCombo(id: string, combo: string) {
    const b = this.bindings.get(id); if (b) this.bindings.set(id, { ...b, combo });
  }
  resetAll() { for (const [id, b] of this.bindings) this.bindings.set(id, { ...b, combo: b.defaultCombo }); }
  getAll(): Binding[] { return [...this.bindings.values()]; }
  // 冲突检测：同一 combo 绑定到多个 action（不同 id）即冲突
  conflicts(): Record<string, string[]> {
    const byCombo = new Map<string, string[]>();
    for (const b of this.bindings.values()) {
      const arr = byCombo.get(b.combo) ?? []; arr.push(b.id); byCombo.set(b.combo, arr);
    }
    const out: Record<string, string[]> = {};
    for (const [combo, ids] of byCombo) if (ids.length > 1) out[combo] = ids;
    return out;
  }
  conflictCount(): number { return Object.keys(this.conflicts()).length; }
  // 作用域裁决：给定当前是否编辑器聚焦，返回某 combo 应触发哪个 binding（编辑器聚焦时 global 让位规则按需）
  resolve(combo: string, editorFocused: boolean): Binding | null {
    const matches = [...this.bindings.values()].filter(b => b.combo === combo);
    if (matches.length === 0) return null;
    // 优先 editor（编辑器聚焦时），再 app，再 global
    if (editorFocused) { const e = matches.find(m => m.scope === 'editor'); if (e) return e; }
    return matches.find(m => m.scope === 'global') ?? matches[0];
  }
}