import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { auth } from "@/app/(auth)/auth";
import { ChatSDKError } from "@/lib/errors";
import {
  deleteAgentPresetById,
  getAccessibleAgentPresetById,
  getSystemSetting,
  updateAgentPreset,
} from "@/lib/db/queries";
import { isAgentWorkflowAdminType } from "@/lib/middleware/admin";
import {
  AGENT_SECONDARY_TYPE_CONFIG_KEY,
  isValidSecondaryTypeForPresetType,
  normalizeAgentSecondaryTypeConfig,
} from "@/lib/agents/secondary-type-config";

const slotSchema = z.object({
  title: z.string().trim().max(128).optional(),
  promptTemplate: z.string().trim().min(1).max(8000),
  defaultParams: z.record(z.string(), z.any()).nullable().optional(),
  requireUpload: z.boolean().optional(),
  uploadLabel: z.string().trim().max(128).optional(),
  referenceAssetIds: z.array(z.string().uuid()).max(12).optional(),
});

const updateAgentSchema = z
  .object({
    name: z.string().trim().min(1).max(128).optional(),
    type: z.enum(["image", "video", "text"]).optional(),
    secondaryType: z.string().trim().max(128).nullable().optional(),
    visibility: z.enum(["public", "private"]).optional(),
    categoryPath: z
      .object({
        sectionId: z.string().trim().max(64).optional(),
        sectionName: z.string().trim().max(64).optional(),
        level1Id: z.string().trim().max(64).optional(),
        level1Name: z.string().trim().max(64).optional(),
        level2Id: z.string().trim().max(64).optional(),
        level2Name: z.string().trim().max(64).optional(),
        level3Id: z.string().trim().max(64).optional(),
        level3Name: z.string().trim().max(64).optional(),
        productCategory: z.string().trim().max(64).optional(),
        audienceTag: z.string().trim().max(64).optional(),
        usageScenario: z.string().trim().max(64).optional(),
        brand: z.string().trim().max(64).optional(),
      })
      .nullable()
      .optional(),
    description: z.string().trim().max(2000).nullable().optional(),
    defaultModelId: z.string().uuid().optional(),
    defaultParams: z.record(z.string(), z.any()).nullable().optional(),
    avatarAssetId: z.string().uuid().nullable().optional(),
    slots: z.array(slotSchema).min(1).max(20).optional(),
    status: z.enum(["active", "disabled", "hidden", "blocked"]).optional(),
  });

export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { id } = await params;
    const preset = await getAccessibleAgentPresetById({
      id,
      userId: session.user.id,
    });

    if (!preset) {
      return NextResponse.json({ success: false, error: "风格化不存在" }, { status: 404 });
    }

    return NextResponse.json({ success: true, data: preset });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    return NextResponse.json(
      { success: false, error: "获取风格化失败" },
      { status: 500 }
    );
  }
}

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { id } = await params;
    const body = await request.json();
    const data = updateAgentSchema.parse(body);
    const existingPreset = await getAccessibleAgentPresetById({
      id,
      userId: session.user.id,
    });

    if (!existingPreset) {
      return NextResponse.json({ success: false, error: "风格化不存在" }, { status: 404 });
    }
    const canManagePublicPreset =
      isAgentWorkflowAdminType(session.user.type) && existingPreset.visibility === "public";
    if (!canManagePublicPreset && existingPreset.ownerUserId !== session.user.id) {
      return NextResponse.json({ success: false, error: "Forbidden" }, { status: 403 });
    }

    const effectiveType = data.type || existingPreset.type;
    const effectiveSecondaryType =
      data.secondaryType === undefined ? existingPreset.secondaryType : data.secondaryType;
    const secondaryTypeConfig = normalizeAgentSecondaryTypeConfig(
      (
        await getSystemSetting({ key: AGENT_SECONDARY_TYPE_CONFIG_KEY }).catch(() => undefined)
      )?.value
    );

    if (
      !isValidSecondaryTypeForPresetType({
        presetType: effectiveType,
        secondaryType: effectiveSecondaryType,
        config: secondaryTypeConfig,
      })
    ) {
      return NextResponse.json(
        { success: false, error: "所选二级类型不在后台配置列表中" },
        { status: 400 }
      );
    }

    const preset = await updateAgentPreset({
      id,
      userId: canManagePublicPreset ? existingPreset.ownerUserId : session.user.id,
      name: data.name,
      type: data.type,
      secondaryType: data.secondaryType ?? undefined,
      visibility: data.visibility,
      categoryPath: data.categoryPath ?? undefined,
      description: data.description ?? undefined,
      defaultModelId: data.defaultModelId,
      defaultParams: data.defaultParams ?? undefined,
      avatarAssetId: data.avatarAssetId ?? undefined,
      slots: data.slots,
      status: data.status,
    });

    return NextResponse.json({ success: true, data: preset });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { success: false, error: error.message },
        { status: 400 }
      );
    }
    return NextResponse.json(
      { success: false, error: "更新风格化失败" },
      { status: 500 }
    );
  }
}

export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { id } = await params;
    const existingPreset = await getAccessibleAgentPresetById({
      id,
      userId: session.user.id,
    });

    if (!existingPreset) {
      return NextResponse.json({ success: false, error: "风格化不存在" }, { status: 404 });
    }
    const canManagePublicPreset =
      isAgentWorkflowAdminType(session.user.type) && existingPreset.visibility === "public";
    if (!canManagePublicPreset && existingPreset.ownerUserId !== session.user.id) {
      return NextResponse.json({ success: false, error: "Forbidden" }, { status: 403 });
    }

    const deleted = await deleteAgentPresetById({
      id,
      userId: canManagePublicPreset ? existingPreset.ownerUserId : session.user.id,
    });

    if (!deleted) {
      return NextResponse.json({ success: false, error: "风格化不存在" }, { status: 404 });
    }

    return NextResponse.json({ success: true, data: deleted });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    return NextResponse.json(
      { success: false, error: "删除风格化失败" },
      { status: 500 }
    );
  }
}