import type { Metadata } from "next";
import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { CheckCircle, XCircle, Database, Cpu } from "lucide-react";
import { getAllSiteSettings } from "@/lib/site-settings";
import { AdminSettingsForm } from "@/components/admin/admin-settings-form";
import { AdminDefaultModelForm } from "@/components/admin/admin-default-model-form";

export const metadata: Metadata = {};

const SETTING_GROUPS = [
  {
    title: "AI Provider Keys",
    description: "Override the environment variable API keys at runtime. Values are encrypted at rest.",
    keys: ["OPENAI_API_KEY", "ANTHROPIC_API_KEY", "OPENROUTER_API_KEY"] as const,
  },
  {
    title: "AI Configuration",
    description: "Provider routing and model defaults.",
    keys: ["OPENROUTER_DEFAULT_MODEL", "OLLAMA_BASE_URL"] as const,
  },
];

function resolveProvider(settings: Record<string, { value: string | null }>) {
  if (settings["OPENROUTER_API_KEY"]?.value) return { provider: "OpenRouter", description: "Routes to many models via openrouter.ai" };
  if (settings["OPENAI_API_KEY"]?.value) return { provider: "OpenAI", description: "Direct OpenAI API (GPT-4 etc.)" };
  if (settings["ANTHROPIC_API_KEY"]?.value) return { provider: "Anthropic", description: "Direct Anthropic API (Claude models)" };
  const url = settings["OLLAMA_BASE_URL"]?.value || "http://localhost:11434";
  return { provider: "Ollama", description: `Local inference at ${url}` };
}

export default async function AdminAiConfigPage() {
  const settings = await getAllSiteSettings();
  const active = resolveProvider(settings);

  const keyRows = [
    { key: "OPENROUTER_API_KEY", label: "OPENROUTER_API_KEY" },
    { key: "OPENAI_API_KEY", label: "OPENAI_API_KEY" },
    { key: "ANTHROPIC_API_KEY", label: "ANTHROPIC_API_KEY" },
  ];

  return (
    <div className="space-y-8">
      <div>
        <h1 className="text-2xl font-bold tracking-tight">AI Configuration</h1>
        <p className="text-muted-foreground text-sm mt-1">
          Provider keys, routing, and default models for AI generation. DB values here take precedence over environment variables — clear a value to fall back to the env var.
        </p>
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Active Provider (fallback, no default set below)</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="flex items-center gap-3">
            <Badge className="text-sm px-3 py-1">{active.provider}</Badge>
            <span className="text-muted-foreground text-sm">{active.description}</span>
          </div>
          <p className="text-xs text-muted-foreground mt-3">
            Priority: OpenRouter → OpenAI → Anthropic → Ollama (first configured key wins) — only when a user has no personal preference, no BYOK key, and no default is set for that use case below.
          </p>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">API Keys</CardTitle>
        </CardHeader>
        <CardContent>
          {keyRows.map(({ key, label }) => {
            const meta = settings[key];
            const present = !!meta?.value;
            return (
              <div key={key} className="flex items-center justify-between py-2 border-b last:border-0">
                <div className="flex items-center gap-2">
                  {present ? (
                    <CheckCircle className="h-4 w-4 text-green-500" />
                  ) : (
                    <XCircle className="h-4 w-4 text-muted-foreground" />
                  )}
                  <span className="font-mono text-sm">{label}</span>
                </div>
                <div className="flex items-center gap-2">
                  {present && meta?.fromDb && (
                    <span className="flex items-center gap-1 text-xs text-muted-foreground">
                      <Database className="h-3 w-3" /> DB override
                    </span>
                  )}
                  {present && !meta?.fromDb && (
                    <span className="flex items-center gap-1 text-xs text-muted-foreground">
                      <Cpu className="h-3 w-3" /> from .env
                    </span>
                  )}
                  <Badge variant={present ? "default" : "secondary"}>
                    {present ? "Configured" : "Not set"}
                  </Badge>
                </div>
              </div>
            );
          })}
          <div className="flex items-center justify-between py-2 border-b">
            <span className="font-mono text-sm text-muted-foreground">OLLAMA_BASE_URL</span>
            <span className="text-sm text-muted-foreground font-mono">
              {settings["OLLAMA_BASE_URL"]?.value || "http://localhost:11434 (default)"}
            </span>
          </div>
          <div className="flex items-center justify-between py-2">
            <span className="font-mono text-sm text-muted-foreground">OPENROUTER_DEFAULT_MODEL</span>
            <span className="text-sm text-muted-foreground font-mono">
              {settings["OPENROUTER_DEFAULT_MODEL"]?.value || "google/gemini-flash-1.5 (default)"}
            </span>
          </div>
        </CardContent>
      </Card>

      {SETTING_GROUPS.map((group) => (
        <AdminSettingsForm key={group.title} group={group} settings={settings} />
      ))}

      <AdminDefaultModelForm
        initialValues={{
          DEFAULT_TEXT_PROVIDER: settings["DEFAULT_TEXT_PROVIDER"]?.value ?? null,
          DEFAULT_TEXT_MODEL: settings["DEFAULT_TEXT_MODEL"]?.value ?? null,
          DEFAULT_VISION_PROVIDER: settings["DEFAULT_VISION_PROVIDER"]?.value ?? null,
          DEFAULT_VISION_MODEL: settings["DEFAULT_VISION_MODEL"]?.value ?? null,
          DEFAULT_MEAL_PLAN_PROVIDER: settings["DEFAULT_MEAL_PLAN_PROVIDER"]?.value ?? null,
          DEFAULT_MEAL_PLAN_MODEL: settings["DEFAULT_MEAL_PLAN_MODEL"]?.value ?? null,
        }}
      />
    </div>
  );
}