"use client";

import { useEffect, useMemo, useState, useCallback } from "react";
import {
  useApplyMode,
  useCatalog,
  useOllamaKey,
  useRoutingMode,
  useSetOllamaKey,
  useSelfHostedModels,
} from "@/hooks/use-providers";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Separator } from "@/components/ui/separator";
import {
  AlertTriangle,
  Cpu,
  Key,
  KeyRound,
  Server,
  ShieldCheck,
  Sparkles,
} from "lucide-react";
import { toast } from "sonner";
import { AssignmentScope, ModelProvider } from "@/types";
import type { RoutingMode, SelfHostedTestResult } from "@/lib/api/providers";
import { SelfHostedSection } from "@/components/settings/self-hosted-section";
import { Badge } from "@/components/ui/badge";
import { Checkbox } from "@/components/ui/checkbox";

// Matches the roboco agents_config AGENT_ROLE_MAP / AGENT_TEAM_MAP.
// Hard-coded so Mix mode shows a stable 18-row picker without an extra
// server round-trip. Order mirrors the org chart in CLAUDE.md.
//
// NOTE: CEO is explicitly excluded — it's the human-in-the-loop seat
// (Renzo), not an LLM-backed agent. Routing it anywhere would be a
// no-op in spawn_agent but confusing in the UI.
const AGENTS: { slug: string; label: string }[] = [
  { slug: "product-owner", label: "Product Owner" },
  { slug: "head-marketing", label: "Head of Marketing" },
  { slug: "auditor", label: "Auditor" },
  { slug: "main-pm", label: "Main PM" },
  { slug: "be-pm", label: "Backend PM" },
  { slug: "be-dev-1", label: "Backend Dev 1" },
  { slug: "be-dev-2", label: "Backend Dev 2" },
  { slug: "be-qa", label: "Backend QA" },
  { slug: "be-doc", label: "Backend Documenter" },
  { slug: "fe-pm", label: "Frontend PM" },
  { slug: "fe-dev-1", label: "Frontend Dev 1" },
  { slug: "fe-dev-2", label: "Frontend Dev 2" },
  { slug: "fe-qa", label: "Frontend QA" },
  { slug: "fe-doc", label: "Frontend Documenter" },
  { slug: "ux-pm", label: "UX/UI PM" },
  { slug: "ux-dev-1", label: "UX/UI Dev" },
  { slug: "ux-qa", label: "UX/UI QA" },
  { slug: "ux-doc", label: "UX/UI Documenter" },
];

export function AIRoutingCard() {
  const { data: catalog = [] } = useCatalog();
  const { data: keyStatus } = useOllamaKey();
  const { data: snapshot } = useRoutingMode();
  const { data: selfHostedModels = [] } = useSelfHostedModels();

  const setKey = useSetOllamaKey();
  const applyMode = useApplyMode();

  const hasOllamaKey = !!keyStatus?.has_key;
  const currentMode: RoutingMode = snapshot?.mode ?? "anthropic";

  // Track the latest self-hosted test result so ModeButton can gate access.
  const [selfHostedTestResult, setSelfHostedTestResult] =
    useState<SelfHostedTestResult | null>(null);
  const isSelfHostedConnected = selfHostedTestResult?.ok === true;

  const handleSelfHostedTestResult = useCallback(
    (result: SelfHostedTestResult) => {
      setSelfHostedTestResult(result);
    },
    [],
  );

  // Selected self-hosted model (used when mode === 'self_hosted').
  const [selfHostedModel, setSelfHostedModel] = useState<string>("");

  // --- API key input ---
  const [apiKey, setApiKey] = useState("");
  const [clearKey, setClearKey] = useState(false);

  const saveKey = async () => {
    try {
      if (clearKey) {
        await setKey.mutateAsync("");
        toast.success("Ollama key cleared");
      } else {
        if (!apiKey.trim()) {
          toast.error("Enter a key first");
          return;
        }
        await setKey.mutateAsync(apiKey);
        toast.success("Ollama key saved");
      }
      setApiKey("");
      setClearKey(false);
    } catch (e) {
      toast.error("Save failed: " + errMsg(e));
    }
  };

  // --- Mix mode state: agent_slug → model_name ---
  const initialMix = useMemo(() => {
    const map: Record<string, string> = {};
    for (const a of snapshot?.assignments ?? []) {
      if (a.scope === AssignmentScope.AGENT_SLUG && a.scope_value) {
        map[a.scope_value] = a.model_name;
      }
    }
    return map;
  }, [snapshot]);

  const [mixMap, setMixMap] = useState<Record<string, string>>(initialMix);
  useEffect(() => {
    // Reset local state when server returns a fresh snapshot (after save,
    // mode switch, or initial load).
    setMixMap(initialMix);
  }, [initialMix]);

  const catalogForMix = catalog;
  const catalogOllamaOnly = catalog.filter(
    (c: { provider_type: ModelProvider }) => c.provider_type === ModelProvider.OLLAMA_CLOUD,
  );
  const catalogAnthropicOnly = catalog.filter(
    (c: { provider_type: ModelProvider }) => c.provider_type === ModelProvider.ANTHROPIC,
  );

  // --- Mode toggle handlers ---
  const flipToAnthropic = async () => {
    if (!confirm("Switch every agent to Anthropic? Clears any overrides.")) return;
    try {
      await applyMode.mutateAsync({ mode: "anthropic" });
      toast.success("All agents now on Anthropic");
    } catch (e) {
      toast.error("Switch failed: " + errMsg(e));
    }
  };

  const flipToOllama = async () => {
    if (!hasOllamaKey) {
      toast.error("Save an Ollama API key first");
      return;
    }
    if (!confirm("Switch every agent to Ollama? Clears any overrides.")) return;
    try {
      await applyMode.mutateAsync({ mode: "ollama" });
      toast.success("All agents now on Ollama");
    } catch (e) {
      toast.error("Switch failed: " + errMsg(e));
    }
  };

  const flipToSelfHosted = async () => {
    if (!isSelfHostedConnected) {
      toast.error("Test the self-hosted connection first");
      return;
    }
    if (
      !confirm(
        "Switch every agent to the self-hosted LLM? Clears any overrides.",
      )
    )
      return;
    try {
      await applyMode.mutateAsync({
        mode: "self_hosted",
        ...(selfHostedModel ? { default_model: selfHostedModel } : {}),
      });
      toast.success("All agents now on Self-Hosted LLM");
    } catch (e) {
      toast.error("Switch failed: " + errMsg(e));
    }
  };

  const saveMix = async () => {
    // Filter out empty picks (nothing selected = inherit global).
    const per_agent: Record<string, string> = {};
    for (const [slug, model] of Object.entries(mixMap)) {
      if (model) per_agent[slug] = model;
    }
    if (Object.keys(per_agent).length === 0) {
      toast.error("Pick a model for at least one agent");
      return;
    }
    const needsKey = Object.values(per_agent).some((m) =>
      catalog.find(
        (c: { model_name: string; provider_type: ModelProvider }) =>
          c.model_name === m &&
          c.provider_type === ModelProvider.OLLAMA_CLOUD,
      ),
    );
    if (needsKey && !hasOllamaKey) {
      toast.error(
        "At least one agent is routed to an Ollama model but no key is saved",
      );
      return;
    }
    const needsSelfHosted = Object.values(per_agent).some((m) =>
      selfHostedModels.find((sh) => sh.model_name === m),
    );
    if (needsSelfHosted && !isSelfHostedConnected) {
      toast.error(
        "At least one agent is routed to a self-hosted model but the connection has not been tested",
      );
      return;
    }
    try {
      await applyMode.mutateAsync({ mode: "mix", per_agent });
      toast.success("Per-agent routing saved");
    } catch (e) {
      toast.error("Save failed: " + errMsg(e));
    }
  };

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <Cpu className="h-5 w-5" /> AI Routing
        </CardTitle>
        <CardDescription>
          Decide which model backs each agent. Anthropic uses the mounted
          <code className="px-1"> ~/.claude </code> auth; Ollama Cloud uses
          the API key you save below; Self-Hosted connects to any OpenAI-compatible
          endpoint you run locally.
        </CardDescription>
      </CardHeader>
      <CardContent className="space-y-6">
        {/* -------- Ollama key -------- */}
        <section className="space-y-2">
          <div className="flex items-center justify-between">
            <Label className="text-sm font-medium">Ollama Cloud API key</Label>
            {hasOllamaKey ? (
              <Badge className="bg-emerald-500/10 text-emerald-600 border-0">
                <KeyRound className="h-3 w-3" /> key set
              </Badge>
            ) : (
              <Badge className="bg-amber-500/10 text-amber-600 border-0">
                <Key className="h-3 w-3" /> not set
              </Badge>
            )}
          </div>
          <div className="flex gap-2">
            <Input
              type="password"
              value={apiKey}
              onChange={(e) => setApiKey(e.target.value)}
              placeholder={
                hasOllamaKey ? "•••••••••••• (leave blank to keep)" : "ollama_xxx…"
              }
              disabled={clearKey}
            />
            <Button onClick={saveKey} disabled={setKey.isPending}>
              {setKey.isPending ? "Saving…" : "Save"}
            </Button>
          </div>
          {hasOllamaKey ? (
            <label className="flex items-center gap-2 text-xs text-muted-foreground cursor-pointer">
              <Checkbox
                checked={clearKey}
                onCheckedChange={(checked) => {
                  const next = checked === true;
                  setClearKey(next);
                  if (next) setApiKey("");
                }}
              />
              Clear the stored key
            </label>
          ) : (
            <p className="text-xs text-muted-foreground">
              Stored Fernet-encrypted server-side; never returned by the API.
            </p>
          )}
        </section>

        <Separator />

        {/* -------- Self-Hosted LLM -------- */}
        <SelfHostedSection
          testResult={selfHostedTestResult}
          onTestResult={handleSelfHostedTestResult}
          onTestSuccess={() => undefined}
        />

        <Separator />

        {/* -------- Mode toggle -------- */}
        <section className="space-y-3">
          <Label className="text-sm font-medium">Routing mode</Label>
          <div className="grid grid-cols-2 md:grid-cols-4 gap-2">
            <ModeButton
              icon={<ShieldCheck className="h-4 w-4" />}
              label="Anthropic"
              description="Every agent uses Anthropic (via mounted ~/.claude)."
              active={currentMode === "anthropic"}
              onClick={flipToAnthropic}
              disabled={applyMode.isPending}
            />
            <ModeButton
              icon={<Sparkles className="h-4 w-4" />}
              label="Ollama"
              description={
                hasOllamaKey
                  ? "Every agent uses Ollama Cloud (Minimax M3 default)."
                  : "Save the Ollama key first."
              }
              active={currentMode === "ollama"}
              onClick={flipToOllama}
              disabled={applyMode.isPending || !hasOllamaKey}
            />
            <ModeButton
              icon={<Server className="h-4 w-4" />}
              label="Self-Hosted"
              description={
                isSelfHostedConnected
                  ? "Every agent uses your self-hosted LLM endpoint."
                  : "Test the connection above first."
              }
              active={currentMode === "self_hosted"}
              onClick={flipToSelfHosted}
              disabled={applyMode.isPending || !isSelfHostedConnected}
            />
            <ModeButton
              icon={<Cpu className="h-4 w-4" />}
              label="Mix"
              description="Pick a model per agent (table appears below)."
              active={currentMode === "mix"}
              // "Mix" is engaged by picking models + Save — not a direct
              // toggle. Clicking just scrolls awareness.
              onClick={() => undefined}
              disabled={false}
              highlight={currentMode === "mix"}
            />
          </div>
          {currentMode === "mix" && !hasOllamaKey ? (
            <p className="text-xs text-amber-600 flex items-center gap-1">
              <AlertTriangle className="h-3 w-3" />
              Some agents may already be routed to Ollama but no key is
              saved — those agents will fall back to Anthropic at spawn.
            </p>
          ) : null}
        </section>

        {/* -------- Self-Hosted model picker (when self_hosted mode active) -------- */}
        {currentMode === "self_hosted" && (
          <>
            <Separator />
            <section className="space-y-2">
              <Label className="text-sm font-medium">
                Self-Hosted default model
              </Label>
              <p className="text-xs text-muted-foreground">
                Choose which discovered model all agents should use in
                self-hosted mode.
              </p>
              <Select
                value={selfHostedModel || "__clear__"}
                onValueChange={(v: string) =>
                  setSelfHostedModel(v === "__clear__" ? "" : v)
                }
              >
                <SelectTrigger className="w-full max-w-sm">
                  <SelectValue placeholder="(use server default)" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="__clear__">(use server default)</SelectItem>
                  {selfHostedModels.map((m) => (
                    <SelectItem key={m.model_name} value={m.model_name}>
                      {m.display_name}
                      {m.display_name !== m.model_name
                        ? ` — ${m.model_name}`
                        : ""}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </section>
          </>
        )}

        {/* -------- Mix-mode per-agent picker -------- */}
        <Separator />
        <section className="space-y-3">
          <div className="flex items-center justify-between">
            <Label className="text-sm font-medium">
              Per-agent override (mix mode)
            </Label>
            <Button
              size="sm"
              onClick={saveMix}
              disabled={applyMode.isPending}
            >
              {applyMode.isPending ? "Saving…" : "Save mix"}
            </Button>
          </div>
          <p className="text-xs text-muted-foreground">
            Leave a row blank to inherit from the global mode. Saving
            overwrites all per-agent overrides with what&apos;s picked here.
          </p>
          <div className="divide-y rounded-md border">
            {AGENTS.map((a) => (
              <div
                key={a.slug}
                className="grid grid-cols-[1fr_280px] items-center gap-2 px-3 py-2"
              >
                <div>
                  <div className="font-mono text-sm">{a.slug}</div>
                  <div className="text-xs text-muted-foreground">
                    {a.label}
                  </div>
                </div>
                <Select
                  value={mixMap[a.slug] ?? ""}
                  onValueChange={(v: string) =>
                    setMixMap((prev) => ({
                      ...prev,
                      [a.slug]: v === "__clear__" ? "" : v,
                    }))
                  }
                >
                  <SelectTrigger className="w-full">
                    <SelectValue placeholder="(inherit)" />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="__clear__">(inherit global)</SelectItem>

                    {/* Anthropic models */}
                    {catalogAnthropicOnly.length > 0 && (
                      <SelectGroup>
                        <SelectLabel>
                          <ProviderBadge variant="anthropic" />
                          Anthropic
                        </SelectLabel>
                        {catalogAnthropicOnly.map(
                          (c: { model_name: string; display_name: string }) => (
                            <SelectItem key={c.model_name} value={c.model_name}>
                              {c.display_name}
                            </SelectItem>
                          ),
                        )}
                      </SelectGroup>
                    )}

                    {/* Ollama Cloud models */}
                    {catalogOllamaOnly.length > 0 && (
                      <SelectGroup>
                        <SelectLabel>
                          <ProviderBadge variant="ollama" />
                          Ollama Cloud
                        </SelectLabel>
                        {catalogOllamaOnly.map(
                          (c: { model_name: string; display_name: string }) => (
                            <SelectItem key={c.model_name} value={c.model_name}>
                              {c.display_name}
                            </SelectItem>
                          ),
                        )}
                      </SelectGroup>
                    )}

                    {/* Self-Hosted models */}
                    {selfHostedModels.length > 0 && (
                      <SelectGroup>
                        <SelectLabel>
                          <ProviderBadge variant="self-hosted" />
                          Self-Hosted
                        </SelectLabel>
                        {selfHostedModels.map((m) => (
                          <SelectItem key={m.model_name} value={m.model_name}>
                            {m.display_name}
                          </SelectItem>
                        ))}
                      </SelectGroup>
                    )}

                    {/* Fallback: un-grouped catalog when no grouping is possible */}
                    {catalogAnthropicOnly.length === 0 &&
                      catalogOllamaOnly.length === 0 &&
                      selfHostedModels.length === 0 &&
                      catalogForMix.map(
                        (c: { model_name: string; display_name: string }) => (
                          <SelectItem key={c.model_name} value={c.model_name}>
                            {c.display_name} — {c.model_name}
                          </SelectItem>
                        ),
                      )}
                  </SelectContent>
                </Select>
              </div>
            ))}
          </div>
          {catalogOllamaOnly.length === 0 ? (
            <p className="text-xs text-muted-foreground">
              Ollama catalog empty — check /api/providers/catalog.
            </p>
          ) : null}
        </section>
      </CardContent>
    </Card>
  );
}

// ---------------------------------------------------------------------------

function ModeButton({
  icon,
  label,
  description,
  active,
  disabled,
  onClick,
  highlight,
}: {
  icon: React.ReactNode;
  label: string;
  description: string;
  active: boolean;
  disabled: boolean;
  onClick: () => void | Promise<void>;
  highlight?: boolean;
}) {
  return (
    <Button
      type="button"
      variant="outline"
      onClick={onClick}
      disabled={disabled}
      className={
        "h-auto flex-col items-start justify-start p-3 whitespace-normal " +
        (active || highlight ? "border-primary bg-primary/5" : "")
      }
    >
      <div className="flex w-full items-center gap-2 text-sm font-medium">
        {icon}
        <span>{label}</span>
        {active ? (
          <Badge className="ml-auto bg-primary/15 text-primary border-0 text-xs">
            active
          </Badge>
        ) : null}
      </div>
      <p className="mt-1 text-xs text-muted-foreground font-normal">{description}</p>
    </Button>
  );
}

function errMsg(e: unknown): string {
  return e instanceof Error ? e.message : "Unknown error";
}

// ---------------------------------------------------------------------------
// Small colored pill to distinguish providers in the Mix mode dropdown.
// ---------------------------------------------------------------------------

function ProviderBadge({
  variant,
}: {
  variant: "anthropic" | "ollama" | "self-hosted";
}) {
  const styles: Record<string, string> = {
    anthropic: "bg-blue-500/20 text-blue-700 dark:text-blue-400",
    ollama: "bg-violet-500/20 text-violet-700 dark:text-violet-400",
    "self-hosted": "bg-purple-500/20 text-purple-700 dark:text-purple-400",
  };
  const labels: Record<string, string> = {
    anthropic: "A",
    ollama: "O",
    "self-hosted": "S",
  };
  return (
    <span
      className={
        "mr-1 inline-flex h-4 w-4 items-center justify-center rounded-full text-[10px] font-bold " +
        (styles[variant] ?? "")
      }
    >
      {labels[variant]}
    </span>
  );
}
