import { randomUUID } from "node:crypto";
import { logger } from "../logger.js";
export class ChatSessionBridge {
    registry;
    runtime;
    // 这里额外保存 session -> 用户上下文，供工具桥在服务端代发真实后端请求时复用。
    sessionContexts = new Map();
    constructor(registry, runtime) {
        this.registry = registry;
        this.runtime = runtime;
    }
    async resolve(context) {
        const requestContext = {
            clientSessionId: context.clientSessionId?.trim() || `agent-${randomUUID().slice(0, 12)}`,
            accessToken: context.accessToken,
            projectId: context.projectId,
            traceId: context.traceId?.trim() || `trace-${randomUUID().slice(0, 12)}`,
        };
        this.cleanupExpired();
        const current = this.registry.get(requestContext);
        if (current) {
            this.sessionContexts.set(current.sessionId, requestContext);
            try {
                // 只有 opencode 侧 session 仍存在时，才复用本地映射。
                await this.runtime.getSession(current.sessionId);
                return { binding: current, requestContext, created: false };
            }
            catch (error) {
                logger.warn({
                    clientSessionId: requestContext.clientSessionId,
                    sessionId: current.sessionId,
                    err: error,
                }, "existing opencode session lookup failed, creating a new session");
            }
        }
        const session = await this.runtime.createSession(requestContext.clientSessionId);
        const binding = this.registry.upsert(requestContext, session.id);
        this.sessionContexts.set(binding.sessionId, requestContext);
        return { binding, requestContext, created: true };
    }
    count() {
        return this.registry.count();
    }
    getSessionContext(sessionId) {
        return this.sessionContexts.get(sessionId) ?? null;
    }
    async abort(context) {
        const clientSessionId = context.clientSessionId?.trim();
        if (!clientSessionId) {
            return null;
        }
        const requestContext = {
            clientSessionId,
            accessToken: context.accessToken,
            projectId: context.projectId,
            traceId: context.traceId?.trim() || `trace-${randomUUID().slice(0, 12)}`,
        };
        this.cleanupExpired();
        const binding = this.registry.get(requestContext);
        if (!binding) {
            return null;
        }
        this.sessionContexts.set(binding.sessionId, requestContext);
        await this.runtime.abortSession(binding.sessionId);
        return binding;
    }
    async fork(context) {
        const currentClientSessionId = context.clientSessionId?.trim();
        const nextRequestContext = {
            clientSessionId: `agent-${randomUUID().slice(0, 12)}`,
            accessToken: context.accessToken,
            projectId: context.projectId,
            traceId: context.traceId?.trim() || `trace-${randomUUID().slice(0, 12)}`,
        };
        this.cleanupExpired();
        if (!currentClientSessionId || context.keepMessageCount <= 0) {
            const session = await this.runtime.createSession(nextRequestContext.clientSessionId);
            const binding = this.registry.upsert(nextRequestContext, session.id);
            this.sessionContexts.set(binding.sessionId, nextRequestContext);
            return { binding, requestContext: nextRequestContext, created: true };
        }
        const currentContext = {
            clientSessionId: currentClientSessionId,
            accessToken: context.accessToken,
            projectId: context.projectId,
            traceId: nextRequestContext.traceId,
        };
        const current = this.registry.get(currentContext);
        if (!current) {
            const session = await this.runtime.createSession(nextRequestContext.clientSessionId);
            const binding = this.registry.upsert(nextRequestContext, session.id);
            this.sessionContexts.set(binding.sessionId, nextRequestContext);
            return { binding, requestContext: nextRequestContext, created: true };
        }
        await this.runtime.getSession(current.sessionId);
        const messages = await this.runtime.messages(current.sessionId, Math.max(100, context.keepMessageCount + 20));
        const chatMessages = messages.filter((message) => message.info.role === "user" || message.info.role === "assistant");
        const keepMessage = chatMessages[context.keepMessageCount - 1];
        if (!keepMessage) {
            throw new Error(`fork keep point not found for message count ${context.keepMessageCount}`);
        }
        const session = await this.runtime.forkSession(current.sessionId, keepMessage.info.id);
        const binding = this.registry.upsert(nextRequestContext, session.id);
        this.sessionContexts.set(binding.sessionId, nextRequestContext);
        return { binding, requestContext: nextRequestContext, created: true };
    }
    cleanupExpired() {
        const expiredSessionIds = this.registry.evictExpired();
        for (const sessionId of expiredSessionIds) {
            this.sessionContexts.delete(sessionId);
            // 这里用 abort 做轻量清理；即使失败，也不阻断本地过期回收。
            void this.runtime.abortSession(sessionId).catch((error) => {
                logger.debug({ sessionId, err: error }, "ignoring failed abort for expired session");
            });
        }
    }
}