import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { db } from "@/lib/db";
import { navLinks } from "@/lib/db/schema";
import { eq } from "drizzle-orm";
import { auth } from "@/app/(auth)/auth";

// GET /api/nav-links - 获取所有导航链接 (公开)
export async function GET() {
  try {
    const links = await db
      .select()
      .from(navLinks)
      .where(eq(navLinks.isEnabled, true))
      .orderBy(navLinks.order);
    
    return NextResponse.json({ links });
  } catch (error) {
    console.error("[Nav Links API] Get error:", error);
    return NextResponse.json(
      { error: "Failed to fetch nav links" },
      { status: 500 }
    );
  }
}

const createSchema = z.object({
  name: z.string().min(1).max(64),
  url: z.string().url(),
  order: z.number().int().default(0),
  isEnabled: z.boolean().default(true),
});

// POST /api/nav-links - 创建导航链接（仅管理员）
export async function POST(request: NextRequest) {
  try {
    const session = await auth();
    
    if (!session?.user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }
    
    if (session.user.type !== "admin") {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 });
    }
    
    const body = await request.json();
    const data = createSchema.parse(body);
    
    const [created] = await db
      .insert(navLinks)
      .values({
        ...data,
        createdBy: session.user.id,
      })
      .returning();
    
    return NextResponse.json(created);
  } catch (error) {
    console.error("[Nav Links API] Create error:", error);
    
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: "Invalid request data", details: error.errors },
        { status: 400 }
      );
    }
    
    return NextResponse.json(
      { error: "Failed to create nav link" },
      { status: 500 }
    );
  }
}

const updateSchema = z.object({
  id: z.string().uuid(),
  name: z.string().min(1).max(64).optional(),
  url: z.string().url().optional(),
  order: z.number().int().optional(),
  isEnabled: z.boolean().optional(),
});

// PUT /api/nav-links - 更新导航链接（仅管理员）
export async function PUT(request: NextRequest) {
  try {
    const session = await auth();
    
    if (!session?.user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }
    
    if (session.user.type !== "admin") {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 });
    }
    
    const body = await request.json();
    const { id, ...data } = updateSchema.parse(body);
    
    const [updated] = await db
      .update(navLinks)
      .set({
        ...data,
        updatedAt: new Date(),
      })
      .where(eq(navLinks.id, id))
      .returning();
    
    if (!updated) {
      return NextResponse.json({ error: "Nav link not found" }, { status: 404 });
    }
    
    return NextResponse.json(updated);
  } catch (error) {
    console.error("[Nav Links API] Update error:", error);
    
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: "Invalid request data", details: error.errors },
        { status: 400 }
      );
    }
    
    return NextResponse.json(
      { error: "Failed to update nav link" },
      { status: 500 }
    );
  }
}

// DELETE /api/nav-links - 删除导航链接（仅管理员）
export async function DELETE(request: NextRequest) {
  try {
    const session = await auth();
    
    if (!session?.user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }
    
    if (session.user.type !== "admin") {
      return NextResponse.json({ error: "Forbidden" }, { status: 403 });
    }
    
    const { searchParams } = new URL(request.url);
    const id = searchParams.get("id");
    
    if (!id) {
      return NextResponse.json({ error: "ID is required" }, { status: 400 });
    }
    
    await db.delete(navLinks).where(eq(navLinks.id, id));
    
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("[Nav Links API] Delete error:", error);
    return NextResponse.json(
      { error: "Failed to delete nav link" },
      { status: 500 }
    );
  }
}