"use client";

import { useState } from "react";
import {
  AlertCircle,
  Bot,
  ChevronDown,
  ChevronUp,
  PauseCircle,
  PlayCircle,
} from "lucide-react";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Skeleton } from "@/components/ui/skeleton";
import {
  usePaperclipAgents,
  type AgentPair,
  type DriftEntry,
  type PaperclipAgent,
} from "@/lib/api/paperclip-agents";
import { formatDateShort } from "@/lib/format-date";

const ROLE_LABEL: Record<string, string> = {
  ceo: "CEO",
  researcher: "מחקר",
  engineer: "כתיבה",
  qa: "בקרה",
  general: "כללי",
};

const FIELD_LABEL: Record<string, string> = {
  model: "מודל",
  effort: "effort",
  timeoutSec: "timeout (שניות)",
  maxTurnsPerRun: "max turns",
  desiredSkills: "skills",
  instructionsBundleMode: "bundle mode",
  instructionsEntryFile: "entry file",
  graceSec: "grace (שניות)",
  cooldownSec: "cooldown (שניות)",
  wakeOnDemand: "wake on demand",
  maxConcurrentRuns: "max concurrent",
  budget_monthly_cents: "תקציב חודשי",
  status: "סטטוס",
};

function formatCents(cents: number | null): string {
  if (cents == null) return "—";
  return `$${(cents / 100).toFixed(2)}`;
}

function StatusBadge({ agent }: { agent: PaperclipAgent }) {
  const status = agent.status ?? "unknown";
  if (status === "paused" || status === "terminated") {
    return (
      <Badge variant="outline" className="bg-warn-bg text-warn border-warn/40">
        <PauseCircle className="w-3 h-3 me-1" />
        {status === "paused" ? "מושהה" : "סיים"}
      </Badge>
    );
  }
  return (
    <Badge variant="outline" className="bg-success-bg text-success border-success/40">
      <PlayCircle className="w-3 h-3 me-1" />
      פעיל
    </Badge>
  );
}

function FieldRow({
  label,
  master,
  mirror,
  drifted,
  mono,
}: {
  label: string;
  master: React.ReactNode;
  mirror: React.ReactNode;
  drifted: boolean;
  mono?: boolean;
}) {
  const cellBase = `tabular-nums text-[0.82rem] ${mono ? "font-mono" : ""}`;
  const cellCls = (val: React.ReactNode) =>
    `${cellBase} px-2 py-1 rounded ${
      drifted ? "bg-warn-bg text-warn border border-warn/40" : "text-ink"
    } ${val == null || val === "—" ? "text-ink-light" : ""}`;
  return (
    <div className="grid grid-cols-[7rem_1fr_1fr] gap-2 items-center">
      <div className="text-[0.75rem] text-ink-muted">{label}</div>
      <div className={cellCls(master)} dir="ltr">{master ?? "—"}</div>
      <div className={cellCls(mirror)} dir="ltr">{mirror ?? "—"}</div>
    </div>
  );
}

function PairCard({ pair }: { pair: AgentPair }) {
  const [expanded, setExpanded] = useState(false);
  const driftFields = new Set(pair.drift.map((d) => d.field));
  const driftCount = pair.drift.length;
  const pairMissing = driftFields.has("_pair_missing");
  const a = pair.master ?? pair.mirror;
  if (!a) return null;

  const fieldVal = (
    side: "master" | "mirror",
    key: keyof PaperclipAgent,
  ): React.ReactNode => {
    const agent = pair[side];
    if (!agent) return <span className="text-ink-light">—</span>;
    const v = agent[key];
    if (v == null) return "—";
    if (typeof v === "boolean") return v ? "✓" : "✗";
    if (Array.isArray(v)) return `${v.length}`;
    return String(v);
  };

  const skillsList = (agent: PaperclipAgent | null) =>
    agent?.desiredSkills?.length ? agent.desiredSkills : [];

  return (
    <Card className="bg-surface border-rule shadow-sm">
      <CardContent className="px-5 py-4 space-y-4">
        <div className="flex items-start justify-between gap-3 flex-wrap">
          <div className="flex items-center gap-2 min-w-0">
            <Bot className="w-5 h-5 text-gold-deep shrink-0" />
            <div>
              <h3 className="text-navy font-semibold text-base mb-0">{pair.name}</h3>
              <div className="flex items-center gap-2 mt-0.5">
                <Badge variant="outline" className="text-[0.7rem]">
                  {ROLE_LABEL[pair.role ?? ""] ?? pair.role ?? "—"}
                </Badge>
                {pair.master && <StatusBadge agent={pair.master} />}
              </div>
            </div>
          </div>
          {pairMissing ? (
            <Badge variant="outline" className="bg-danger-bg text-danger border-danger/40">
              <AlertCircle className="w-3 h-3 me-1" />
              {pair.master ? "חסר ב-CMPA" : "חסר ב-CMP"}
            </Badge>
          ) : driftCount > 0 ? (
            <Badge variant="outline" className="bg-warn-bg text-warn border-warn/40">
              <AlertCircle className="w-3 h-3 me-1" />
              {driftCount} פערים
            </Badge>
          ) : (
            <Badge variant="outline" className="bg-success-bg text-success border-success/40">
              מסונכרן
            </Badge>
          )}
        </div>

        <div className="grid grid-cols-[7rem_1fr_1fr] gap-2 text-[0.7rem] uppercase tracking-wide text-ink-muted border-b border-rule pb-1">
          <div></div>
          <div>CMP (1xxx)</div>
          <div>CMPA (8xxx)</div>
        </div>

        <div className="space-y-1">
          <FieldRow label={FIELD_LABEL.model} master={fieldVal("master", "model")} mirror={fieldVal("mirror", "model")} drifted={driftFields.has("model")} mono />
          <FieldRow label={FIELD_LABEL.effort} master={fieldVal("master", "effort")} mirror={fieldVal("mirror", "effort")} drifted={driftFields.has("effort")} />
          <FieldRow label={FIELD_LABEL.timeoutSec} master={fieldVal("master", "timeoutSec")} mirror={fieldVal("mirror", "timeoutSec")} drifted={driftFields.has("timeoutSec")} />
          <FieldRow label={FIELD_LABEL.maxTurnsPerRun} master={fieldVal("master", "maxTurnsPerRun")} mirror={fieldVal("mirror", "maxTurnsPerRun")} drifted={driftFields.has("maxTurnsPerRun")} />
          <FieldRow
            label={FIELD_LABEL.desiredSkills}
            master={pair.master ? `${pair.master.desiredSkills.length}` : "—"}
            mirror={pair.mirror ? `${pair.mirror.desiredSkills.length}` : "—"}
            drifted={driftFields.has("desiredSkills")}
          />
          <FieldRow label={FIELD_LABEL.graceSec} master={fieldVal("master", "graceSec")} mirror={fieldVal("mirror", "graceSec")} drifted={driftFields.has("graceSec")} />
          <FieldRow label={FIELD_LABEL.cooldownSec} master={fieldVal("master", "cooldownSec")} mirror={fieldVal("mirror", "cooldownSec")} drifted={driftFields.has("cooldownSec")} />
          <FieldRow label={FIELD_LABEL.wakeOnDemand} master={fieldVal("master", "wakeOnDemand")} mirror={fieldVal("mirror", "wakeOnDemand")} drifted={driftFields.has("wakeOnDemand")} />
          <FieldRow label={FIELD_LABEL.maxConcurrentRuns} master={fieldVal("master", "maxConcurrentRuns")} mirror={fieldVal("mirror", "maxConcurrentRuns")} drifted={driftFields.has("maxConcurrentRuns")} />
          <FieldRow
            label={FIELD_LABEL.budget_monthly_cents}
            master={
              pair.master
                ? `${formatCents(pair.master.spent_monthly_cents)} / ${formatCents(pair.master.budget_monthly_cents)}`
                : "—"
            }
            mirror={
              pair.mirror
                ? `${formatCents(pair.mirror.spent_monthly_cents)} / ${formatCents(pair.mirror.budget_monthly_cents)}`
                : "—"
            }
            drifted={driftFields.has("budget_monthly_cents")}
          />
          <FieldRow label={FIELD_LABEL.instructionsBundleMode} master={fieldVal("master", "instructionsBundleMode")} mirror={fieldVal("mirror", "instructionsBundleMode")} drifted={driftFields.has("instructionsBundleMode")} mono />
          <FieldRow label={FIELD_LABEL.instructionsEntryFile} master={fieldVal("master", "instructionsEntryFile")} mirror={fieldVal("mirror", "instructionsEntryFile")} drifted={driftFields.has("instructionsEntryFile")} mono />
        </div>

        <div className="flex items-center justify-between pt-1 border-t border-rule">
          <Button
            variant="ghost"
            size="sm"
            className="text-[0.78rem] text-ink-muted"
            onClick={() => setExpanded((v) => !v)}
          >
            {expanded ? (
              <>
                <ChevronUp className="w-3 h-3 me-1" />
                כיווץ
              </>
            ) : (
              <>
                <ChevronDown className="w-3 h-3 me-1" />
                פרטים מלאים
              </>
            )}
          </Button>
          {pair.master?.updated_at && (
            <span className="text-[0.7rem] text-ink-light">
              עודכן: {formatDateShort(pair.master.updated_at)}
            </span>
          )}
        </div>

        {expanded && (
          <div className="pt-2 border-t border-rule space-y-3">
            {pair.drift.length > 0 && !pairMissing && (
              <div className="rounded-md bg-warn-bg/40 border border-warn/30 p-3">
                <div className="text-[0.78rem] text-warn font-medium mb-2">פערי סנכרון</div>
                <ul className="space-y-1 text-[0.78rem]">
                  {pair.drift.map((d: DriftEntry) => (
                    <li key={d.field} className="flex items-center gap-2 flex-wrap">
                      <code dir="ltr" className="text-[0.72rem]">{FIELD_LABEL[d.field] ?? d.field}</code>
                      <span className="text-ink-muted">CMP:</span>
                      <code dir="ltr" className="text-[0.72rem] text-ink">{JSON.stringify(d.master)}</code>
                      <span className="text-ink-muted">CMPA:</span>
                      <code dir="ltr" className="text-[0.72rem] text-ink">{JSON.stringify(d.mirror)}</code>
                    </li>
                  ))}
                </ul>
              </div>
            )}
            <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
              {(["master", "mirror"] as const).map((side) => {
                const agent = pair[side];
                const skills = skillsList(agent);
                return (
                  <div key={side} className="rounded-md border border-rule p-3 space-y-2">
                    <div className="text-[0.75rem] text-ink-muted">
                      {side === "master" ? "CMP" : "CMPA"}
                    </div>
                    {agent ? (
                      <>
                        <div className="text-[0.72rem] font-mono text-ink-muted" dir="ltr">
                          id: {agent.id}
                        </div>
                        <div>
                          <div className="text-[0.72rem] text-ink-muted mb-1">
                            skills ({skills.length})
                          </div>
                          {skills.length === 0 ? (
                            <span className="text-[0.78rem] text-ink-light">—</span>
                          ) : (
                            <ul className="space-y-0.5">
                              {skills.map((s) => (
                                <li key={s} className="text-[0.72rem] font-mono" dir="ltr">
                                  {s}
                                </li>
                              ))}
                            </ul>
                          )}
                        </div>
                        {agent.instructionsFilePath && (
                          <div>
                            <div className="text-[0.72rem] text-ink-muted">instructions path</div>
                            <code className="text-[0.72rem] font-mono break-all" dir="ltr">
                              {agent.instructionsFilePath}
                            </code>
                          </div>
                        )}
                        {agent.pause_reason && (
                          <div className="text-[0.78rem] text-warn">
                            סיבת השהיה: {agent.pause_reason}
                          </div>
                        )}
                      </>
                    ) : (
                      <span className="text-[0.78rem] text-ink-light">חסר</span>
                    )}
                  </div>
                );
              })}
            </div>
          </div>
        )}
      </CardContent>
    </Card>
  );
}

export function AgentsTab() {
  const { data, isPending, error, refetch, isFetching } = usePaperclipAgents();

  if (error) {
    return (
      <Card className="bg-surface border-danger/40">
        <CardContent className="p-6 flex items-center gap-3 text-danger">
          <AlertCircle className="w-5 h-5" />
          <span>שגיאה: {error.message}</span>
        </CardContent>
      </Card>
    );
  }

  if (isPending) {
    return (
      <div className="space-y-3">
        {[...Array(7)].map((_, i) => (
          <Skeleton key={i} className="h-48 w-full rounded-lg" />
        ))}
      </div>
    );
  }

  if (!data || data.pairs.length === 0) {
    return (
      <Card className="bg-surface border-rule">
        <CardContent className="px-6 py-12 text-center text-ink-muted">
          לא נמצאו סוכנים
        </CardContent>
      </Card>
    );
  }

  const totalDrift = data.pairs.reduce(
    (sum, p) => sum + p.drift.filter((d) => d.field !== "_pair_missing").length,
    0,
  );
  const missingCount = data.pairs.filter((p) => !p.master || !p.mirror).length;

  return (
    <div className="space-y-4">
      <Card className="bg-surface border-rule shadow-sm">
        <CardContent className="px-5 py-4 flex items-center justify-between gap-3 flex-wrap">
          <div className="space-y-1">
            <div className="text-[0.85rem] text-ink-muted">
              {data.pairs.length} סוכנים × 2 חברות (CMP master / CMPA mirror)
              {totalDrift > 0 && (
                <span className="text-warn ms-2">
                  · {totalDrift} פערי סנכרון
                </span>
              )}
              {missingCount > 0 && (
                <span className="text-danger ms-2">· {missingCount} זוגות לא שלמים</span>
              )}
            </div>
            <div className="text-[0.7rem] text-ink-light">
              פערי skills מחושבים על paperclipai/* בלבד. local/* ו-company/* מסוננים — שם שונה בין החברות הוא צפוי.
            </div>
          </div>
          <Button
            variant="outline"
            size="sm"
            onClick={() => refetch()}
            disabled={isFetching}
          >
            רענון
          </Button>
        </CardContent>
      </Card>
      <div className="space-y-3">
        {data.pairs.map((pair) => (
          <PairCard key={pair.name} pair={pair} />
        ))}
      </div>
    </div>
  );
}
