import { eq } from "drizzle-orm";
import { type NextRequest, NextResponse } from "next/server";
import { auth } from "@/app/(auth)/auth";
import { readAgentPsdFonts } from "@/lib/agents/psd-font-settings";
import {
  AGENT_PSD_TEMPLATE_CATEGORY_TAG_CONFIG_KEY,
  defaultAgentPsdTemplateCategoryTagConfig,
  normalizeAgentPsdTemplateCategoryTagConfig,
} from "@/lib/agents/psd-template-category-tag-config";
import {
  type AgentPsdTemplate,
  type AgentPsdTemplateListResponse,
  getEditableAgentPsdTemplateLayers,
  isAgentPsdTemplateReady,
  isAgentPsdTemplateRuntimeReady,
  isAgentPsdTextLayerSlot,
  normalizeAgentPsdTemplateMode,
} from "@/lib/agents/psd-template-config";
import { repairAgentPsdTemplateFontBindings } from "@/lib/agents/psd-template-repair";
import {
  AGENT_PSD_TEMPLATE_SECONDARY_CATEGORY_CONFIG_KEY,
  defaultAgentPsdTemplateSecondaryCategoryConfig,
  normalizeAgentPsdTemplateSecondaryCategoryConfig,
} from "@/lib/agents/psd-template-secondary-category-config";
import { readAgentPsdTemplates } from "@/lib/agents/psd-template-settings";
import {
  AGENT_PSD_TEXT_COLOR_CONFIG_KEY,
  defaultAgentPsdTextColorConfig,
  normalizeAgentPsdTextColorConfig,
  resolveAgentPsdTextColorConfigForBrand,
} from "@/lib/agents/psd-text-color-config";
import { db } from "@/lib/db";
import { systemSettings } from "@/lib/db/schema";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

function jsonError(status: number, error: string) {
  const payload: AgentPsdTemplateListResponse = {
    success: false,
    templates: [],
    error,
  };
  return NextResponse.json(payload, { status });
}

function toPublicTemplateSummary(template: AgentPsdTemplate): AgentPsdTemplate {
  return {
    ...template,
    layers: [],
  };
}

export async function GET(request: NextRequest) {
  const session = await auth().catch(() => null);
  if (!session?.user?.id) {
    return jsonError(401, "未登录");
  }

  try {
    const requestedBrand = String(
      request.nextUrl.searchParams.get("brand") || ""
    ).trim();
    const requestedModeRaw = String(
      request.nextUrl.searchParams.get("mode") || ""
    ).trim();
    const summaryOnly =
      String(request.nextUrl.searchParams.get("summary") || "").trim() === "1";
    const requestedMode =
      requestedModeRaw === "main" || requestedModeRaw === "sku"
        ? normalizeAgentPsdTemplateMode(requestedModeRaw)
        : null;
    const [
      allTemplates,
      textColorSetting,
      secondaryCategorySetting,
      categoryTagSetting,
    ] = await Promise.all([
      readAgentPsdTemplates(),
      db
        .select()
        .from(systemSettings)
        .where(eq(systemSettings.key, AGENT_PSD_TEXT_COLOR_CONFIG_KEY))
        .limit(1)
        .then((rows) => rows[0])
        .catch(() => null),
      db
        .select()
        .from(systemSettings)
        .where(
          eq(
            systemSettings.key,
            AGENT_PSD_TEMPLATE_SECONDARY_CATEGORY_CONFIG_KEY
          )
        )
        .limit(1)
        .then((rows) => rows[0])
        .catch(() => null),
      db
        .select()
        .from(systemSettings)
        .where(
          eq(systemSettings.key, AGENT_PSD_TEMPLATE_CATEGORY_TAG_CONFIG_KEY)
        )
        .limit(1)
        .then((rows) => rows[0])
        .catch(() => null),
    ]);
    let templates = allTemplates
      .filter((template) => template.status === "active")
      .filter(isAgentPsdTemplateReady)
      .filter((template) =>
        requestedBrand ? template.brandName === requestedBrand : true
      )
      .filter((template) =>
        requestedMode ? template.mode === requestedMode : true
      )
      .filter(isAgentPsdTemplateRuntimeReady)
      .filter(
        (template) => getEditableAgentPsdTemplateLayers(template).length > 0
      );

    if (summaryOnly) {
      templates = templates.map(toPublicTemplateSummary);
    } else {
      const fonts = (await readAgentPsdFonts().catch(
        () => [] as Awaited<ReturnType<typeof readAgentPsdFonts>>
      )) as Awaited<ReturnType<typeof readAgentPsdFonts>>;
      const fontMap = new Map(fonts.map((font) => [font.id, font]));
      templates = templates
        .map((template) => repairAgentPsdTemplateFontBindings(template, fonts))
        .map((template) => ({
          ...template,
          layers: template.layers.map((layer) => {
            if (!isAgentPsdTextLayerSlot(layer) || !layer.fontId) {
              return layer;
            }

            const font = fontMap.get(layer.fontId);
            if (!font) {
              return layer;
            }

            return {
              ...layer,
              fontFileUrl: font.fileUrl,
              fontContentType: font.contentType,
            };
          }),
        }));
    }

    const normalizedTextColorConfig = textColorSetting
      ? normalizeAgentPsdTextColorConfig(textColorSetting.value)
      : defaultAgentPsdTextColorConfig;

    const response = NextResponse.json({
      success: true,
      templates,
      textColorConfig: requestedBrand
        ? resolveAgentPsdTextColorConfigForBrand(
            normalizedTextColorConfig,
            requestedBrand
          )
        : normalizedTextColorConfig,
      secondaryCategoryConfig: secondaryCategorySetting
        ? normalizeAgentPsdTemplateSecondaryCategoryConfig(
            secondaryCategorySetting.value
          )
        : defaultAgentPsdTemplateSecondaryCategoryConfig,
      categoryTagConfig: categoryTagSetting
        ? normalizeAgentPsdTemplateCategoryTagConfig(categoryTagSetting.value)
        : defaultAgentPsdTemplateCategoryTagConfig,
    } satisfies AgentPsdTemplateListResponse);
    response.headers.set(
      "Cache-Control",
      "private, max-age=60, stale-while-revalidate=300"
    );
    return response;
  } catch (error) {
    console.error("[PSD Templates] list failed:", error);
    return jsonError(503, "PSD 模板读取失败");
  }
}