"use client";

import { Save } from "lucide-react";

import { Button } from "@/components/ui/Button";
import { SectionHeader } from "@/components/ui/SectionHeader";
import { Select } from "@/components/ui/Select";
import { StatusNote } from "@/components/ui/StatusNote";
import { TextInput } from "@/components/ui/TextInput";
import {
  KNOWN_PROVIDERS,
  TIER_LABELS,
  type RoutingDraft,
} from "@/lib/settings/providers";

// 档位路由「模型」输入框的候选 model id（datalist 建议，仍可自由输入）。按 provider 分组。
const MODEL_SUGGESTIONS: Record<string, readonly string[]> = {
  anthropic: ["claude-opus-4", "claude-sonnet-4", "claude-3-5-haiku"],
  deepseek: ["deepseek-chat", "deepseek-reasoner"],
  kimi: ["moonshot-v1-128k", "moonshot-v1-32k", "kimi-k2"],
  openai: ["gpt-4o", "gpt-4o-mini", "o3-mini"],
  qwen: ["qwen-max", "qwen-plus", "qwen-turbo"],
  glm: ["glm-4-plus", "glm-4-air", "glm-4-flash"],
  gemini: ["gemini-2.0-flash", "gemini-1.5-pro"],
  "kimi-code-key": ["kimi-for-coding"],
  "kimi-code": ["kimi-for-coding"],
};

interface RoutingPanelProps {
  routing: RoutingDraft[];
  saving: boolean;
  onProviderChange: (tier: string, providerId: string) => void;
  onModelChange: (tier: string, model: string) => void;
  onSave: () => void;
}

// 能力档位路由面板：写手/分析/轻量三档各指向一个 provider+model（UX §6.10）。
export function RoutingPanel({
  routing,
  saving,
  onProviderChange,
  onModelChange,
  onSave,
}: RoutingPanelProps) {
  return (
    <section className="min-w-0">
      <SectionHeader
        eyebrow="路由"
        title="能力档位路由"
        description="写手、分析、轻量三类能力可分别指向不同模型。保存时只提交完整填写的行。"
      />
      <StatusNote className="mt-3" variant="info">
        写章、审稿和摘要提炼会分别读取对应档位；未完整填写的行不会覆盖现有路由。
      </StatusNote>
      <ul className="mt-4 divide-y divide-line rounded border border-line bg-panel">
        {routing.map((row) => (
          <RoutingRow
            key={row.tier}
            row={row}
            onProviderChange={onProviderChange}
            onModelChange={onModelChange}
          />
        ))}
      </ul>
      <div className="mt-3 flex justify-end">
        <Button
          onClick={onSave}
          disabled={saving}
          variant="primary"
          size="sm"
        >
          <Save className="h-4 w-4" aria-hidden="true" />
          {saving ? "保存中…" : "保存档位路由"}
        </Button>
      </div>
    </section>
  );
}

interface RoutingRowProps {
  row: RoutingDraft;
  onProviderChange: (tier: string, providerId: string) => void;
  onModelChange: (tier: string, model: string) => void;
}

function RoutingRow({ row, onProviderChange, onModelChange }: RoutingRowProps) {
  const tierLabel = TIER_LABELS[row.tier] ?? row.tier;
  return (
    <li className="grid gap-3 px-4 py-3 text-sm md:grid-cols-[6rem_minmax(10rem,14rem)_1fr]">
      <span className="self-center text-ink">{tierLabel}</span>
      <label className="sr-only" htmlFor={`route-provider-${row.tier}`}>
        {tierLabel} 提供商
      </label>
      <Select
        id={`route-provider-${row.tier}`}
        value={row.provider}
        onChange={(e) => onProviderChange(row.tier, e.target.value)}
      >
        <option value="">（未配置）</option>
        {KNOWN_PROVIDERS.map((p) => (
          <option key={p.id} value={p.id}>
            {p.label}
          </option>
        ))}
      </Select>
      <label className="sr-only" htmlFor={`route-model-${row.tier}`}>
        {tierLabel} 模型
      </label>
      <div className="min-w-0">
        <TextInput
          id={`route-model-${row.tier}`}
          value={row.model}
          onChange={(e) => onModelChange(row.tier, e.target.value)}
          placeholder="model"
          className="w-full font-mono"
          list={`route-models-${row.tier}`}
        />
        <datalist id={`route-models-${row.tier}`}>
          {(MODEL_SUGGESTIONS[row.provider] ?? []).map((m) => (
            <option key={m} value={m} />
          ))}
        </datalist>
      </div>
    </li>
  );
}