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

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 });
}

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 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),
    ]);
    const repairedTemplateMap = new Map<
      string,
      Awaited<ReturnType<typeof readAgentPsdTemplates>>[number]
    >();

    for (const template of allTemplates) {
      if (
        template.status !== "active" ||
        !isAgentPsdTemplateReady(template) ||
        (requestedBrand ? template.brandName !== requestedBrand : false) ||
        (requestedMode ? template.mode !== requestedMode : false) ||
        getEditableAgentPsdTemplateLayers(template).length === 0
      ) {
        continue;
      }

      const repairedTemplate = await repairAgentPsdTemplateAssetsIfNeeded(template);
      if (repairedTemplate !== template) {
        repairedTemplateMap.set(template.id, repairedTemplate);
      }
    }

    const sourceTemplates =
      repairedTemplateMap.size > 0
        ? allTemplates.map((template) => repairedTemplateMap.get(template.id) || template)
        : allTemplates;

    if (repairedTemplateMap.size > 0) {
      await upsertSystemSetting({
        key: AGENT_PSD_TEMPLATES_KEY,
        value: sourceTemplates,
        updatedBy: session.user.id,
      }).catch((error) => {
        console.warn("[PSD Templates] failed to persist repaired assets:", error);
      });
    }

    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]));
    const templates = await Promise.all(
      sourceTemplates
      .filter((template) => template.status === "active")
      .filter(isAgentPsdTemplateReady)
      .filter((template) =>
        requestedBrand ? template.brandName === requestedBrand : true
      )
      .filter((template) => (requestedMode ? template.mode === requestedMode : true))
      .filter((template) => getEditableAgentPsdTemplateLayers(template).length > 0)
      .map(async (template) => {
        const resolvedTemplate = await resolveAgentPsdTemplateTextStyles(template).catch(
          () => template
        );

        return {
          ...resolvedTemplate,
          layers: resolvedTemplate.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;

    return 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);
  } catch (error) {
    console.error("[PSD Templates] list failed:", error);
    return jsonError(503, "PSD 模板读取失败");
  }
}