import type { AgentRunNode, AgentRunStatus } from "@umt/contracts";
import { ChevronDown, CornerLeftUp, ExternalLink, GitBranch, LoaderCircle } from "lucide-react";
import { createContext, type ReactNode, useContext, useEffect, useId, useState } from "react";
import { Link } from "react-router";
import { agentMockEnabled, isRunActive, useAgentRun } from "~/api/agent.ts";
import { CHEVRON_CLASS, Disclosure } from "~/components/agentui/disclosure.tsx";
import { LoadingState } from "~/components/console/empty-state.tsx";
import { formatUsd } from "~/components/schedules/labels.ts";
import { cn } from "~/lib/utils.ts";
import { AgentConversation, RunStatusBadge } from "./agent-conversation.tsx";
import { shortGoalTitle } from "./agent-store.ts";
import {
  durationLabel,
  runningText,
  type SubagentState,
  subagentElapsed,
  subagentResultLine,
  subagentState,
} from "./conversation-model.ts";
import { humanizeReport } from "./report-humanize.ts";
import { type SubagentView, useAgentStream } from "./use-agent-stream.ts";

// 子会话(agent.spawn)在父会话里的样子:派出它的位置一张卡片,实时显示任务、状态、当前步骤、时长、调用次数与费用;
// 展开后在卡片里看子会话的过程(同一套会话渲染,缩小一档);可在整页 / 抽屉里打开子会话。
// 数据来自父会话事件流里镜像的 subagent_* 事件,快照里的子会话(状态、用量)校正。

const href = (id: string) => `/console/agent/${id}${agentMockEnabled() ? "?mock=1" : ""}`;

/** 抽屉里提供:点父 / 子会话在抽屉内打开,不跳页 */
export const AgentRunOpenContext = createContext<((runId: string) => void) | null>(null);

/** 会话快照里的子孙会话(按 ID):卡片用它校正状态与用量 */
export const SubagentNodesContext = createContext<Map<string, AgentRunNode>>(new Map());

const STATE_STATUS: Record<SubagentState, AgentRunStatus> = {
  running: "running",
  waiting: "waiting",
  done: "succeeded",
  failed: "failed",
  stopped: "cancelled",
};

function RunLink({ id, className, children }: { id: string; className?: string; children: ReactNode }) {
  const open = useContext(AgentRunOpenContext);
  const cls = cn(
    "cursor-pointer rounded-tight outline-none hover:underline focus-visible:ring-2 focus-visible:ring-ring",
    className,
  );
  if (open)
    return (
      <button type="button" onClick={() => open(id)} className={cls}>
        {children}
      </button>
    );
  return (
    <Link to={href(id)} className={cls}>
      {children}
    </Link>
  );
}

/** 每秒走一次的时钟(只在运行中的卡片上开) */
function useNow(on: boolean): number {
  const [now, setNow] = useState(() => Date.now());
  useEffect(() => {
    if (!on) return;
    const t = setInterval(() => setNow(Date.now()), 1000);
    return () => clearInterval(t);
  }, [on]);
  return now;
}

/** 子会话展开后的过程:读子会话自己的事件流,用同一套会话渲染(紧凑、不重复目标) */
function SubagentSteps({ childId, active }: { childId: string; active: boolean }) {
  const run = useAgentRun(childId);
  const live = useAgentStream(childId, active || !run.data);
  const nodes = new Map((run.data?.children ?? []).map((c) => [c.id, c] as const));
  if (!run.data) return <LoadingState rows={2} />;
  return (
    <SubagentNodesContext.Provider value={nodes}>
      <AgentConversation run={run.data.run} live={live} nested />
    </SubagentNodesContext.Provider>
  );
}

/**
 * 会话流里的子会话卡片。运行中:「正在搜资源… · 12 秒 · 3 次调用」,每秒更新;
 * 结束后:状态 + 汇报第一句 + 用时、调用次数、费用。展开看子会话的过程,「打开」进子会话。
 */
export function SubagentCard({ view }: { view: SubagentView }) {
  const id = useId();
  const node = useContext(SubagentNodesContext).get(view.childRunId);
  const state = subagentState(view, node?.status ?? null);
  const live = state === "running" || state === "waiting";
  const now = useNow(live);
  const [open, setOpen] = useState(false);
  const elapsed = subagentElapsed(view, now, node?.finishedAt ?? null);
  const calls = Math.max(view.toolCalls, node?.toolCallCount ?? 0);
  const cost = Math.max(view.usage?.costUsd ?? 0, node?.usage.costUsd ?? 0);
  const result = subagentResultLine(view.summary ?? node?.summary);
  const line =
    state === "running"
      ? view.currentTool
        ? `${runningText({ capabilityId: view.currentTool })}…`
        : "思考中…"
      : state === "waiting"
        ? "等待中"
        : result
          ? humanizeReport(result).text
          : state === "done"
            ? "已完成"
            : state === "stopped"
              ? "已停止"
              : "没有完成";
  const meta = [durationLabel(elapsed), `${calls} 次调用`, cost ? formatUsd(cost) : null].filter(Boolean).join(" · ");
  return (
    <section
      aria-label={`子会话：${shortGoalTitle(view.goal, 60)}`}
      data-subagent={view.childRunId}
      data-state={state}
      className="w-full max-w-[72ch] scroll-mt-4 rounded-xl border border-border/70 bg-foreground/[0.025]"
    >
      <div className="flex min-w-0 flex-col gap-1 px-3 pt-2.5 pb-2">
        <div className="flex min-w-0 items-center gap-2 text-meta text-muted-foreground">
          <GitBranch aria-hidden className="size-3.5 shrink-0" />
          <span className="shrink-0">子会话</span>
          <RunStatusBadge status={STATE_STATUS[state]} />
          <span className="ml-auto shrink-0 tabular-nums" data-slot="subagent-meta">
            {meta}
          </span>
        </div>
        <p className="line-clamp-2 text-caption break-words text-foreground" title={view.goal}>
          {shortGoalTitle(view.goal, 120)}
        </p>
        <p
          className={cn(
            "flex min-w-0 items-center gap-1.5 text-meta text-muted-foreground",
            state === "failed" && "text-destructive",
          )}
        >
          {state === "running" ? (
            <LoaderCircle aria-hidden className="size-3 shrink-0 animate-spin motion-reduce:animate-none" />
          ) : null}
          <span className="min-w-0 truncate">{line}</span>
        </p>
      </div>
      <div className="flex items-center gap-1 border-t border-border/50 px-1.5 py-1">
        <button
          type="button"
          aria-expanded={open}
          aria-controls={id}
          onClick={() => setOpen((v) => !v)}
          className="inline-flex min-h-7 cursor-pointer items-center gap-1 rounded-md px-1.5 text-meta text-muted-foreground outline-none hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
        >
          <ChevronDown aria-hidden className={cn("size-3.5", CHEVRON_CLASS, open && "rotate-180")} />
          {open ? "收起过程" : "查看过程"}
        </button>
        <RunLink
          id={view.childRunId}
          className="ml-auto inline-flex min-h-7 items-center gap-1 px-1.5 text-meta text-muted-foreground hover:text-foreground"
        >
          打开会话
          <ExternalLink aria-hidden className="size-3" />
        </RunLink>
      </div>
      <Disclosure id={id} open={open}>
        <div className="max-h-[28rem] overflow-y-auto border-t border-border/50 px-3 py-1">
          {open ? <SubagentSteps childId={view.childRunId} active={live} /> : null}
        </div>
      </Disclosure>
    </section>
  );
}

/** 子会话的运行概况:「2 个子会话运行中」/「3 个子会话」;点一下滚到第一张运行中(没有就第一张)的卡片 */
export function subagentChipText(states: SubagentState[]): string | null {
  if (!states.length) return null;
  const running = states.filter((s) => s === "running" || s === "waiting").length;
  return running ? `${running} 个子会话运行中` : `${states.length} 个子会话`;
}

export function SubagentChip({ views, className }: { views: SubagentView[]; className?: string }) {
  const nodes = useContext(SubagentNodesContext);
  const states = views.map((v) => subagentState(v, nodes.get(v.childRunId)?.status ?? null));
  const text = subagentChipText(states);
  if (!text) return null;
  const running = states.some((s) => s === "running" || s === "waiting");
  const target = views[states.findIndex((s) => s === "running" || s === "waiting")] ?? views[0];
  return (
    <button
      type="button"
      title="滚到子会话"
      onClick={() => {
        if (!target) return;
        document
          .querySelector(`[data-subagent="${target.childRunId}"]`)
          ?.scrollIntoView({ behavior: "smooth", block: "center" });
      }}
      className={cn(
        "inline-flex h-7 shrink-0 cursor-pointer items-center gap-1.5 rounded-full border border-border/70 px-2.5 text-meta text-muted-foreground outline-none transition-colors duration-micro hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring",
        className,
      )}
    >
      {running ? (
        <LoaderCircle aria-hidden className="size-3 animate-spin motion-reduce:animate-none" />
      ) : (
        <GitBranch aria-hidden className="size-3" />
      )}
      {text}
    </button>
  );
}

/** 子会话顶部一行:「父会话：xxx」,点了回到父会话 */
export function ParentRunLink({ parent }: { parent: Pick<AgentRunNode, "id" | "goal" | "status"> }) {
  return (
    <p className="flex min-w-0 items-center gap-1.5 text-meta text-muted-foreground">
      <CornerLeftUp aria-hidden className="size-3.5 shrink-0" />
      <span className="shrink-0">父会话</span>
      <RunLink id={parent.id} className="min-w-0 truncate text-foreground/85">
        {shortGoalTitle(parent.goal)}
      </RunLink>
      {isRunActive(parent.status) ? <RunStatusBadge status={parent.status} /> : null}
    </p>
  );
}