import { FastifyInstance } from "fastify";
import prisma from "../../config/database";
import { requirePermission } from "../../middleware/auth";
import { success, error, parseId } from "../../utils/response";
import { parseBody } from "../../schemas/common";
import {
  CreateScopeTemplateSchema,
  CreateItemTemplateSchema,
  UpdateScopeTemplateSchema,
} from "../../schemas/scope-templates.schema";

interface ScopeSectionInput {
  title?: string;
  title_cz?: string;
  content?: string;
  position?: number;
}

export default async function scopeTemplatesRoutes(
  fastify: FastifyInstance,
): Promise<void> {
  // Legacy ?action= dispatcher for item templates
  fastify.get(
    "/",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const query = request.query as Record<string, unknown>;
      const action = query.action ? String(query.action) : null;

      if (action === "items") {
        const items = await prisma.item_templates.findMany({
          where: { is_deleted: false },
          orderBy: { name: "asc" },
        });
        return success(reply, items);
      }

      // Default: scope templates
      const templates = await prisma.scope_templates.findMany({
        where: { is_deleted: false },
        include: {
          scope_template_sections: {
            where: { is_deleted: false },
            orderBy: { position: "asc" },
          },
        },
        orderBy: { name: "asc" },
      });
      return success(reply, templates);
    },
  );

  // Item template CRUD via ?action=item
  fastify.post(
    "/",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const query = request.query as Record<string, unknown>;

      if (String(query.action) === "item") {
        const itemParsed = parseBody(CreateItemTemplateSchema, request.body);
        if ("error" in itemParsed) return error(reply, itemParsed.error, 400);
        const body = itemParsed.data;
        const itemData = {
          name: body.name ? String(body.name) : null,
          description: body.description ? String(body.description) : null,
          default_price:
            body.default_price != null ? Number(body.default_price) : 0,
          category: body.category ? String(body.category) : null,
        };

        if (body.id) {
          const existingItem = await prisma.item_templates.findUnique({
            where: { id: Number(body.id) },
          });
          if (!existingItem) return error(reply, "Šablona nenalezena", 404);
          await prisma.item_templates.update({
            where: { id: Number(body.id) },
            data: { ...itemData, modified_at: new Date() },
          });
          return success(
            reply,
            { id: Number(body.id) },
            200,
            "Položka byla uložena",
          );
        }

        const item = await prisma.item_templates.create({ data: itemData });
        return success(reply, { id: item.id }, 201, "Položka byla vytvořena");
      }

      const scopeParsed = parseBody(CreateScopeTemplateSchema, request.body);
      if ("error" in scopeParsed) return error(reply, scopeParsed.error, 400);
      const body = scopeParsed.data;

      const template = await prisma.scope_templates.create({
        data: {
          name: body.name ? String(body.name) : null,
          title: body.title ? String(body.title) : null,
          description: body.description ? String(body.description) : null,
        },
      });

      if (Array.isArray(body.sections)) {
        await prisma.scope_template_sections.createMany({
          data: (body.sections as ScopeSectionInput[]).map((s, i) => ({
            scope_template_id: template.id,
            title: s.title ?? null,
            title_cz: s.title_cz ?? null,
            content: s.content ?? null,
            position: s.position ?? i,
          })),
        });
      }

      return success(reply, { id: template.id }, 201, "Šablona byla vytvořena");
    },
  );

  // Item template delete via DELETE ?action=item&id=X
  fastify.delete(
    "/",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const query = request.query as Record<string, unknown>;

      if (String(query.action) === "item" && query.id) {
        const id = Number(query.id);
        await prisma.item_templates.update({
          where: { id },
          data: { is_deleted: true, modified_at: new Date() },
        });
        return success(reply, null, 200, "Šablona smazána");
      }

      return error(reply, "Neplatná akce", 400);
    },
  );

  fastify.get<{ Params: { id: string } }>(
    "/:id",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const id = parseId(request.params.id, reply);
      if (id === null) return;
      const template = await prisma.scope_templates.findUnique({
        where: { id },
        include: {
          scope_template_sections: {
            where: { is_deleted: false },
            orderBy: { position: "asc" },
          },
        },
      });
      if (!template || template.is_deleted)
        return error(reply, "Šablona nenalezena", 404);
      return success(reply, template);
    },
  );

  fastify.put<{ Params: { id: string } }>(
    "/:id",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const id = parseId(request.params.id, reply);
      if (id === null) return;
      const parsed = parseBody(UpdateScopeTemplateSchema, request.body);
      if ("error" in parsed) return error(reply, parsed.error, 400);
      const body = parsed.data;

      const existing = await prisma.scope_templates.findUnique({
        where: { id },
      });
      if (!existing) return error(reply, "Šablona nenalezena", 404);

      await prisma.scope_templates.update({
        where: { id },
        data: {
          name: body.name !== undefined ? String(body.name) : undefined,
          title: body.title !== undefined ? String(body.title) : undefined,
          description:
            body.description !== undefined
              ? String(body.description)
              : undefined,
          modified_at: new Date(),
        },
      });

      if (Array.isArray(body.sections)) {
        await prisma.scope_template_sections.deleteMany({
          where: { scope_template_id: id },
        });
        await prisma.scope_template_sections.createMany({
          data: (body.sections as ScopeSectionInput[]).map((s, i) => ({
            scope_template_id: id,
            title: s.title ?? null,
            title_cz: s.title_cz ?? null,
            content: s.content ?? null,
            position: s.position ?? i,
          })),
        });
      }

      return success(reply, { id }, 200, "Šablona byla uložena");
    },
  );

  fastify.delete<{ Params: { id: string } }>(
    "/:id",
    { preHandler: requirePermission("settings.manage") },
    async (request, reply) => {
      const id = parseId(request.params.id, reply);
      if (id === null) return;
      await prisma.scope_templates.update({
        where: { id },
        data: { is_deleted: true, modified_at: new Date() },
      });
      return success(reply, null, 200, "Šablona smazána");
    },
  );
}