// SPEC: PJ2026-010403 API契约 draft-2026-06-17-r0; PJ2026-010401 Web工作台 draft-2026-06-17-r0.
// Responsibility: Code Agent HTTP client for send, steer, turn, trace, session and cancel APIs.

import { fetchJson, type ApiRequestOptions } from "./client";
import type { AgentChatResponse, AgentChatResultResponse, ApiResult } from "@/types";

export interface AgentTraceRequestOptions {
  sinceSeq?: number | null;
  limit?: number | null;
}

function workbenchTracePath(traceId: string, options: AgentTraceRequestOptions = {}): string {
  const params = new URLSearchParams();
  if (Number.isFinite(options.sinceSeq)) params.set("sinceSeq", String(Math.max(0, Math.trunc(Number(options.sinceSeq)))));
  if (Number.isFinite(options.limit)) params.set("limit", String(Math.max(1, Math.trunc(Number(options.limit)))));
  const query = params.toString();
  return `/v1/workbench/traces/${encodeURIComponent(traceId)}/events${query ? `?${query}` : ""}`;
}

export const agentAPI = {
  sendAgentMessage: (payload: Record<string, unknown>, timeoutMs: number, activityRef?: ApiRequestOptions["activityRef"]): Promise<ApiResult<AgentChatResponse>> => fetchJson("/v1/agent/chat", { method: "POST", body: JSON.stringify(payload), timeoutMs, timeoutName: "Code Agent", activityRef }),
  steerAgentMessage: (payload: Record<string, unknown>, timeoutMs: number, activityRef?: ApiRequestOptions["activityRef"]): Promise<ApiResult<AgentChatResponse>> => fetchJson("/v1/agent/chat/steer", { method: "POST", body: JSON.stringify(payload), timeoutMs, timeoutName: "Code Agent steer", activityRef }),
  getAgentTurn: async (traceId: string, timeoutMs = 8000, activityRef?: ApiRequestOptions["activityRef"]): Promise<ApiResult<AgentChatResultResponse>> => normalizeWorkbenchTurnResult(await fetchJson<Record<string, unknown>>(`/v1/workbench/turns/${encodeURIComponent(traceId)}`, { timeoutMs, timeoutName: "Code Agent turn", activityRef }), traceId),
  getAgentTrace: async (traceId: string, timeoutMs = 8000, activityRef?: ApiRequestOptions["activityRef"], options?: AgentTraceRequestOptions): Promise<ApiResult<AgentChatResultResponse>> => normalizeWorkbenchTraceResult(await fetchJson<Record<string, unknown>>(workbenchTracePath(traceId, options), { timeoutMs, timeoutName: "Code Agent trace", activityRef }), traceId),
  createAgentSession: (payload: Record<string, unknown> = {}): Promise<ApiResult<{ session?: Record<string, unknown> }>> => fetchJson("/v1/agent/sessions", { method: "POST", body: JSON.stringify(payload), timeoutMs: 30000, timeoutName: "Code Agent session create" }),
  getAgentSession: (sessionId: string): Promise<ApiResult<{ session?: Record<string, unknown> }>> => fetchJson(`/v1/agent/sessions/${encodeURIComponent(sessionId)}`, { timeoutMs: 8000, timeoutName: "Code Agent session" }),
  deleteAgentSession: (sessionId: string): Promise<ApiResult<{ ok?: boolean; status?: string; session?: Record<string, unknown>; archivedCount?: number }>> => fetchJson(`/v1/agent/sessions/${encodeURIComponent(sessionId)}`, { method: "DELETE", timeoutMs: 30000, timeoutName: "Code Agent session delete" }),
  cancelAgentMessage: (payload: Record<string, unknown>): Promise<ApiResult<{ ok?: boolean; canceled?: boolean; error?: { code?: string; message?: string; userMessage?: string } }>> => fetchJson("/v1/agent/chat/cancel", { method: "POST", body: JSON.stringify(payload), timeoutMs: 30000, timeoutName: "Code Agent cancel" })
};

function normalizeWorkbenchTurnResult(result: ApiResult<Record<string, unknown>>, traceId: string): ApiResult<AgentChatResultResponse> {
  if (!result.ok || !result.data) return result as ApiResult<AgentChatResultResponse>;
  const turn = recordValue(result.data.turn) ?? result.data;
  const trace = recordValue(turn.trace);
  const status = canonicalWorkbenchStatus(textValue(turn.status) ?? textValue(result.data.status) ?? "unknown", textValue(trace?.status, result.data.traceStatus));
  const terminal = turn.terminal === true || isTerminalStatus(status);
  return {
    ...result,
    data: {
      ...turn,
      traceId: textValue(turn.traceId) ?? traceId,
      status,
      running: !terminal && (turn.running === true || isActiveStatus(status)),
      terminal,
      sessionId: textValue(turn.sessionId) ?? undefined,
      threadId: textValue(turn.threadId) ?? undefined,
      agentRun: recordValue(turn.agentRun) ?? undefined,
      updatedAt: textValue(turn.updatedAt) ?? textValue(result.data.observedAt) ?? undefined
    } as AgentChatResultResponse
  };
}

function canonicalWorkbenchStatus(primary: string | null, traceStatus: string | null): string {
  const primaryStatus = normalizeStatus(primary);
  const trace = normalizeStatus(traceStatus);
  if (trace && isTerminalStatus(trace) && (!primaryStatus || isActiveStatus(primaryStatus) || !isTerminalStatus(primaryStatus))) return trace;
  return primaryStatus ?? trace ?? "unknown";
}

function normalizeStatus(value: unknown): string | null {
  const text = textValue(value);
  if (!text) return null;
  const normalized = text.toLowerCase().replace(/_/gu, "-");
  return normalized === "cancelled" ? "canceled" : normalized;
}

function isActiveStatus(value: unknown): boolean {
  return ["accepted", "active", "busy", "creating", "pending", "processing", "running"].includes(normalizeStatus(value) ?? "");
}

function isTerminalStatus(value: unknown): boolean {
  return ["blocked", "canceled", "completed", "failed", "stale", "thread-resume-failed", "timeout"].includes(normalizeStatus(value) ?? "");
}

function normalizeWorkbenchTraceResult(result: ApiResult<Record<string, unknown>>, traceId: string): ApiResult<AgentChatResultResponse> {
  if (!result.ok || !result.data) return result as ApiResult<AgentChatResultResponse>;
  const events = Array.isArray(result.data.events) ? result.data.events : [];
  const nextSeq = Number(result.data.nextSeq ?? result.data.nextSinceSeq);
  return {
    ...result,
    data: {
      ...result.data,
      traceId: textValue(result.data.traceId) ?? traceId,
      status: textValue(result.data.traceStatus, result.data.status) ?? "unknown",
      traceStatus: textValue(result.data.traceStatus, result.data.status) ?? undefined,
      events,
      traceEvents: events,
      eventCount: Number.isFinite(Number(result.data.eventCount)) ? Number(result.data.eventCount) : events.length,
      hasMore: result.data.hasMore === true,
      fullTraceLoaded: result.data.hasMore !== true,
      nextSinceSeq: Number.isFinite(nextSeq) ? Math.trunc(nextSeq) : null,
      range: recordValue(result.data.range) ?? undefined,
      runnerTrace: {
        traceId: textValue(result.data.traceId) ?? traceId,
        status: textValue(result.data.traceStatus, result.data.status) ?? undefined,
        events,
        eventCount: Number.isFinite(Number(result.data.eventCount)) ? Number(result.data.eventCount) : events.length,
        hasMore: result.data.hasMore === true,
        fullTraceLoaded: result.data.hasMore !== true,
        nextSinceSeq: Number.isFinite(nextSeq) ? Math.trunc(nextSeq) : null,
        range: recordValue(result.data.range) ?? undefined,
        eventSource: "trace-api"
      }
    } as AgentChatResultResponse
  };
}

function recordValue(value: unknown): Record<string, unknown> | null {
  return value && typeof value === "object" ? value as Record<string, unknown> : null;
}

function textValue(...values: unknown[]): string | null {
  for (const value of values) {
    if (typeof value !== "string") continue;
    const text = value.trim();
    if (text) return text;
  }
  return null;
}