import type { SCUMCommandResult, SCUMConfigPatch, SCUMConfigRead, SCUMFeatureAvailability, SCUMFeatureKey, SCUMStatePatch, SCUMStateSnapshot, SCUMVehicleSpawn } from "./contracts.js";
import { validateConfigPatch, validateStatePatch, validateVehicleSpawn } from "./schemas.js";

export type PluginFeatureBridge = { dispatch(action: "game-client.command", payload: Record<string, string>): Promise<{ status: string; result?: Record<string, string>; error?: { message: string } }> };
export type SCUMFeatureAPI = {
  availability(feature: SCUMFeatureKey): Promise<SCUMFeatureAvailability>; readConfig(): Promise<SCUMConfigRead | null>; patchConfig(patch: SCUMConfigPatch): Promise<SCUMCommandResult>;
  stateSnapshot(playerId: string): Promise<SCUMStateSnapshot | null>; requestStatePatch(patch: SCUMStatePatch): Promise<SCUMCommandResult>; requestVehicleSpawn(spawn: SCUMVehicleSpawn): Promise<SCUMCommandResult>;
};

export function createSCUMFeatureAPI(bridge: PluginFeatureBridge, availableFeatures: readonly SCUMFeatureAvailability[]): SCUMFeatureAPI {
  const availability = async (feature: SCUMFeatureKey) => availableFeatures.find((item) => item.feature === feature) ?? { feature, available: false, reason: "插件未声明此功能。" };
  return {
    availability,
    async readConfig() { const result = await bridge.dispatch("game-client.command", { type: "config.read" }); return result.status === "ok" ? decode<SCUMConfigRead>(result.result) : null; },
    async patchConfig(patch) { const error = validateConfigPatch(patch); if (error) return { status: "validation-failed", summary: error }; return commandResult(await bridge.dispatch("game-client.command", { type: "config.patch", patch: JSON.stringify(patch) })); },
    async stateSnapshot(playerId) { const result = await bridge.dispatch("game-client.command", { type: "player.lookup", playerId }); return result.status === "ok" ? decode<SCUMStateSnapshot>(result.result) : null; },
    async requestStatePatch(patch) { const error = validateStatePatch(patch.changes); if (error) return { status: "validation-failed", summary: error }; return commandResult(await bridge.dispatch("game-client.command", { type: "game-state.patch", patch: JSON.stringify(patch) })); },
    async requestVehicleSpawn(spawn) { const error = validateVehicleSpawn(spawn); if (error) return { status: "validation-failed", summary: error }; return commandResult(await bridge.dispatch("game-client.command", { type: "vehicle.spawn", vehicleCode: spawn.vehicleCode })); }
  };
}

function commandResult(result: { status: string; result?: Record<string, string>; error?: { message: string } }): SCUMCommandResult { if (result.status === "queued") return { status: "queued", summary: result.result?.summary ?? "已进入任务队列。" }; if (result.status === "unsupported") return { status: "unsupported", summary: result.error?.message ?? "当前运行时不支持此操作。" }; return { status: "failed", summary: result.error?.message ?? "操作未被接受。" }; }
function decode<T>(result: Record<string, string> | undefined): T | null { const payload = result?.payload; if (!payload) return null; try { return JSON.parse(payload) as T; } catch { return null; } }