"use client";

import { useState } from "react";

import { useToast } from "@/components/Toast";
import { CredentialsPanel } from "@/components/settings/CredentialsPanel";
import type { TestResult } from "@/components/settings/CredentialRow";
import { KimiCodeOauth } from "@/components/settings/KimiCodeOauth";
import { RoutingPanel } from "@/components/settings/RoutingPanel";
import {
  SECTION_OPTIONS,
  SettingsNav,
  type SettingsSection,
} from "@/components/settings/SettingsNav";
import { SegmentedControl } from "@/components/ui/SegmentedControl";
import { api } from "@/lib/api/client";
import {
  applyProviderChange,
  draftsToRoutingInput,
  toRoutingDrafts,
  type RoutingDraft,
} from "@/lib/settings/providers";
import type { ProvidersResponse } from "@/lib/api/types";

interface ProvidersSettingsProps {
  initial: ProvidersResponse;
  // Kimi Code OAuth 连接态（GET .../oauth/status，进页 Server Component 取）。
  kimiOauth: { connected: boolean; expiresAt: string | null };
}

// 设置页主体（UX §6.10）：档位路由（可编辑）+ API-key 凭据行 + Kimi Code OAuth 连接区。
export function ProvidersSettings({
  initial,
  kimiOauth,
}: ProvidersSettingsProps) {
  const toast = useToast();
  const [activeSection, setActiveSection] =
    useState<SettingsSection>("routing");
  const [providers, setProviders] = useState(initial.providers ?? []);
  const [routing, setRouting] = useState<RoutingDraft[]>(
    toRoutingDrafts(initial.tier_routing ?? []),
  );
  const [savingRouting, setSavingRouting] = useState(false);
  const [drafts, setDrafts] = useState<Record<string, string>>({});
  const [savingId, setSavingId] = useState<string | null>(null);
  const [testingId, setTestingId] = useState<string | null>(null);
  const [results, setResults] = useState<Record<string, TestResult>>({});

  const sectionDetail = (value: SettingsSection): string => {
    if (value === "routing") {
      return `${routing.filter((r) => r.provider && r.model).length}/3 已配置`;
    }
    if (value === "oauth") {
      return kimiOauth.connected ? "Kimi 已连接" : "未连接";
    }
    return `${providers.length} 个凭据`;
  };

  const updateRouting = (tier: string, providerId: string): void => {
    setRouting((prev) =>
      prev.map((d) =>
        d.tier === tier ? applyProviderChange(d, providerId) : d,
      ),
    );
  };

  const updateRoutingModel = (tier: string, model: string): void => {
    setRouting((prev) =>
      prev.map((d) => (d.tier === tier ? { ...d, model } : d)),
    );
  };

  const saveRouting = async (): Promise<void> => {
    setSavingRouting(true);
    try {
      const { data, error } = await api.PUT("/settings/providers", {
        body: { tier_routing: draftsToRoutingInput(routing) },
      });
      if (error || !data) {
        toast("保存档位路由失败，请重试", "error");
        return;
      }
      setProviders(data.providers ?? []);
      setRouting(toRoutingDrafts(data.tier_routing ?? []));
      toast("档位路由已保存", "success");
    } catch {
      toast("保存档位路由失败，请检查后端连接", "error");
    } finally {
      setSavingRouting(false);
    }
  };

  const saveCredential = async (providerId: string): Promise<void> => {
    const apiKey = (drafts[providerId] ?? "").trim();
    if (!apiKey) {
      toast("请先输入 API Key", "error");
      return;
    }
    setSavingId(providerId);
    try {
      const { data, error } = await api.PUT("/settings/providers", {
        body: { credentials: [{ provider: providerId, api_key: apiKey }] },
      });
      if (error || !data) {
        toast("保存凭据失败，请重试", "error");
        return;
      }
      setProviders(data.providers ?? []);
      setDrafts((prev) => ({ ...prev, [providerId]: "" }));
      toast("凭据已保存", "success");
    } catch {
      toast("保存凭据失败，请检查后端连接", "error");
    } finally {
      setSavingId(null);
    }
  };

  const testConnection = async (providerId: string): Promise<void> => {
    setTestingId(providerId);
    try {
      const { data, error } = await api.POST("/settings/providers/test", {
        body: { provider: providerId },
      });
      if (error || !data) {
        toast("测试连接失败", "error");
        return;
      }
      setResults((prev) => ({
        ...prev,
        [providerId]: { ok: data.ok, capabilities: data.capabilities },
      }));
      toast(
        data.ok ? "连接成功" : "连接未通过",
        data.ok ? "success" : "error",
      );
    } catch {
      toast("测试连接失败，请检查后端连接", "error");
    } finally {
      setTestingId(null);
    }
  };

  const updateDraft = (providerId: string, value: string): void => {
    setDrafts((prev) => ({ ...prev, [providerId]: value }));
  };

  return (
    <div className="grid gap-6 lg:grid-cols-[12rem_1fr]">
      <SettingsNav
        activeSection={activeSection}
        onSelect={setActiveSection}
        detailFor={sectionDetail}
      />

      <div className="min-w-0">
        <SegmentedControl
          options={SECTION_OPTIONS}
          value={activeSection}
          onChange={setActiveSection}
          ariaLabel="设置分组"
          className="mb-4 w-full justify-center lg:hidden"
        />

        {activeSection === "routing" ? (
          <RoutingPanel
            routing={routing}
            saving={savingRouting}
            onProviderChange={updateRouting}
            onModelChange={updateRoutingModel}
            onSave={() => void saveRouting()}
          />
        ) : null}

        {activeSection === "oauth" ? (
          <section className="min-w-0">
            <KimiCodeOauth
              initialConnected={kimiOauth.connected}
              initialExpiresAt={kimiOauth.expiresAt}
            />
          </section>
        ) : null}

        {activeSection === "keys" ? (
          <CredentialsPanel
            providers={providers}
            drafts={drafts}
            savingId={savingId}
            testingId={testingId}
            results={results}
            onDraftChange={updateDraft}
            onSave={(id) => void saveCredential(id)}
            onTest={(id) => void testConnection(id)}
          />
        ) : null}
      </div>
    </div>
  );
}