import { type Application, type RequestHandler, type Response, Router } from "express";
import { z } from "zod/v4";

import {
  ProcessTemplateInputSchema,
  StartProcessInputSchema,
  UpdateProcessInputSchema,
} from "../../../common/processes";
import type { ProcessUseCases } from "../../application/process.use-cases";
import { buildProcess, buildProcessTemplate } from "../../application/process-response.builder";

const companyParams = z.strictObject({ companyId: z.uuid().transform((v) => v.toLowerCase()) });
const itemParams = companyParams.extend({ id: z.uuid().transform((v) => v.toLowerCase()) });
const templateParams = z.strictObject({ id: z.uuid().transform((v) => v.toLowerCase()) });
function fail(response: Response, code: string) {
  response
    .status(code === "INVALID_REQUEST" ? 400 : code.endsWith("NOT_FOUND") ? 404 : 409)
    .json({ code, requestId: response.getHeader("x-request-id") });
}
function actorOf(request: unknown) {
  return z.object({ session: z.object({ userId: z.uuid() }) }).safeParse(request);
}
export function registerProcessRoutes(
  app: Application,
  useCases: ProcessUseCases,
  authenticate: RequestHandler
) {
  const router = Router();
  router.use((request, response, next) => {
    if (!z.strictObject({}).safeParse(request.query).success) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    next();
  });
  router.get("/templates", (_request, response, next) => {
    useCases
      .catalog()
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        response.json({
          templates: result.data.templates.map((t) => buildProcessTemplate(t, result.data)),
        });
      })
      .catch(next);
  });
  for (const path of ["/templates", "/templates/:id/update"]) {
    router.post(path, (request, response, next) => {
      const body = z.strictObject({ values: ProcessTemplateInputSchema }).safeParse(request.body);
      const params = path.endsWith("update")
        ? templateParams.safeParse(request.params)
        : z.strictObject({}).safeParse(request.params);
      const actor = actorOf(request);
      if (!(body.success && params.success && actor.success)) {
        fail(response, "INVALID_REQUEST");
        return;
      }
      const id =
        "id" in params.data && typeof params.data.id === "string" ? params.data.id : undefined;
      useCases
        .saveTemplate(body.data.values, actor.data.session.userId, id)
        .then((result) => {
          if (!result.isSuccess) {
            fail(response, result.error.code);
            return;
          }
          response
            .status(id ? 200 : 201)
            .json({ template: buildProcessTemplate(result.data.template, result.data.context) });
        })
        .catch(next);
    });
  }
  router.get("/:companyId", (request, response, next) => {
    const params = companyParams.safeParse(request.params);
    if (!params.success) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    useCases
      .get(params.data.companyId)
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        response.json({
          processes: result.data.processes.map((p) => buildProcess(p, result.data)),
        });
      })
      .catch(next);
  });
  router.get("/:companyId/people/:id/review", (request, response, next) => {
    const params = itemParams.safeParse(request.params);
    if (!params.success) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    useCases
      .get(params.data.companyId)
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        const review = result.data.reviews.get(params.data.id);
        if (!review) {
          fail(response, "PROCESS_PERSON_NOT_FOUND");
          return;
        }
        response.json({ review });
      })
      .catch(next);
  });
  router.post("/:companyId", (request, response, next) => {
    const params = companyParams.safeParse(request.params);
    const body = z.strictObject({ values: StartProcessInputSchema }).safeParse(request.body);
    const actor = actorOf(request);
    if (!(params.success && body.success && actor.success)) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    useCases
      .start(params.data.companyId, body.data.values, actor.data.session.userId)
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        response
          .status(201)
          .json({ process: buildProcess(result.data.process, result.data.context) });
      })
      .catch(next);
  });
  router.post("/:companyId/:id/update", (request, response, next) => {
    const params = itemParams.safeParse(request.params);
    const body = z.strictObject({ values: UpdateProcessInputSchema }).safeParse(request.body);
    const actor = actorOf(request);
    if (!(params.success && body.success && actor.success)) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    useCases
      .update(params.data.companyId, params.data.id, body.data.values, actor.data.session.userId)
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        response.json({ process: buildProcess(result.data.process, result.data.context) });
      })
      .catch(next);
  });
  router.post("/:companyId/:id/refresh", (request, response, next) => {
    const params = itemParams.safeParse(request.params);
    const body = z.strictObject({ revisionId: z.uuid() }).safeParse(request.body);
    const actor = actorOf(request);
    if (!(params.success && body.success && actor.success)) {
      fail(response, "INVALID_REQUEST");
      return;
    }
    useCases
      .refresh(
        params.data.companyId,
        params.data.id,
        body.data.revisionId,
        actor.data.session.userId
      )
      .then((result) => {
        if (!result.isSuccess) {
          fail(response, result.error.code);
          return;
        }
        response.json({ process: buildProcess(result.data.process, result.data.context) });
      })
      .catch(next);
  });
  app.use("/api/processes", authenticate, router);
}