import "reflect-metadata";
import { injectable } from "inversify";
import { getPayload } from "payload";
import type { SanitizedConfig } from "payload";
import {
  NoopTracer,
  NoopLogger,
  type ITracer,
  type ILogger,
} from "@repo/core-shared/instrumentation";

import type { IArticlesRepository } from "../../application/repositories/articles.repository.interface";
import type { Article } from "../../entities/models/article";

type PayloadArticleDoc = {
  id: string | number;
  title?: string | null;
  slug?: string | null;
  content?: unknown;
  status?: string | null;
  author?: string | number | { id: string | number } | null;
  createdAt?: string | null;
  updatedAt?: string | null;
};

function mapDoc(doc: PayloadArticleDoc): Article {
  const authorId =
    typeof doc.author === "object" && doc.author !== null
      ? String(doc.author.id)
      : doc.author != null
        ? String(doc.author)
        : "";
  return {
    id: String(doc.id),
    title: doc.title ?? "",
    slug: doc.slug ?? "",
    content: doc.content ?? null,
    status: doc.status === "published" ? "published" : "draft",
    authorId,
    createdAt: doc.createdAt ? new Date(doc.createdAt) : new Date(0),
    updatedAt: doc.updatedAt ? new Date(doc.updatedAt) : new Date(0),
  };
}

const FEATURE = "blog" as const;
const REPO = "articles" as const;

@injectable()
export class ArticlesRepository implements IArticlesRepository {
  private config: SanitizedConfig;
  private tracer: ITracer;
  private logger: ILogger;

  constructor(
    config: SanitizedConfig,
    tracer: ITracer = new NoopTracer(),
    logger: ILogger = new NoopLogger(),
  ) {
    this.config = config;
    this.tracer = tracer;
    this.logger = logger;
  }

  async getArticle(id: string): Promise<Article | undefined> {
    return this.tracer.startSpan(
      { name: "articles.getArticle", op: "repository", attributes: { id } },
      async (span) => {
        try {
          const payload = await getPayload({ config: this.config });
          const doc = await payload.findByID({
            collection: "articles",
            id,
            overrideAccess: true,
          });
          span.setAttribute("found", true);
          return mapDoc(doc as PayloadArticleDoc);
        } catch (err) {
          // Payload throws on not-found; treat as undefined per existing semantics
          if (
            err &&
            typeof err === "object" &&
            "status" in err &&
            (err as { status: unknown }).status === 404
          ) {
            span.setAttribute("found", false);
            return undefined;
          }
          this.logger.captureException(err, {
            tags: { feature: FEATURE, repo: REPO, method: "getArticle" },
          });
          span.setStatus(
            "error",
            err instanceof Error ? err.message : String(err),
          );
          throw err;
        }
      },
    );
  }

  async getArticleBySlug(slug: string): Promise<Article | undefined> {
    return this.tracer.startSpan(
      {
        name: "articles.getArticleBySlug",
        op: "repository",
        attributes: { slug },
      },
      async (span) => {
        try {
          const payload = await getPayload({ config: this.config });
          const result = await payload.find({
            collection: "articles",
            where: { slug: { equals: slug } },
            limit: 1,
            overrideAccess: true,
          });
          const doc = result.docs[0] as PayloadArticleDoc | undefined;
          span.setAttribute("found", Boolean(doc));
          return doc ? mapDoc(doc) : undefined;
        } catch (err) {
          this.logger.captureException(err, {
            tags: { feature: FEATURE, repo: REPO, method: "getArticleBySlug" },
          });
          span.setStatus(
            "error",
            err instanceof Error ? err.message : String(err),
          );
          throw err;
        }
      },
    );
  }

  async getArticles(options?: {
    status?: string;
    authorId?: string;
    limit?: number;
    offset?: number;
  }): Promise<Article[]> {
    return this.tracer.startSpan(
      {
        name: "articles.getArticles",
        op: "repository",
        attributes: {
          status: options?.status ?? null,
          authorId: options?.authorId ?? null,
          limit: options?.limit ?? null,
          offset: options?.offset ?? null,
        },
      },
      async (span) => {
        try {
          const payload = await getPayload({ config: this.config });
          const where: Record<string, { equals: string }> = {};
          if (options?.status) where.status = { equals: options.status };
          if (options?.authorId) where.author = { equals: options.authorId };

          const limit = options?.limit ?? 50;
          const offset = options?.offset ?? 0;
          // Payload paginates by page, not offset. A non-aligned offset
          // (offset % limit !== 0) straddles two pages, so fetch both and
          // slice out the exact [offset, offset + limit) window.
          const page = limit > 0 ? Math.floor(offset / limit) + 1 : 1;
          const remainder = limit > 0 ? offset % limit : 0;

          const findPage = (p: number) =>
            payload.find({
              collection: "articles",
              where: where as never,
              limit,
              page: p,
              overrideAccess: true,
            });

          const first = await findPage(page);
          let docs = first.docs;
          if (remainder > 0) {
            if (docs.length === limit) {
              const second = await findPage(page + 1);
              docs = [...docs, ...second.docs];
            }
            docs = docs.slice(remainder, remainder + limit);
          }
          span.setAttribute("count", docs.length);
          return docs.map((d) => mapDoc(d as PayloadArticleDoc));
        } catch (err) {
          this.logger.captureException(err, {
            tags: { feature: FEATURE, repo: REPO, method: "getArticles" },
          });
          span.setStatus(
            "error",
            err instanceof Error ? err.message : String(err),
          );
          throw err;
        }
      },
    );
  }

  async createArticle(input: Article): Promise<Article> {
    return this.tracer.startSpan(
      {
        name: "articles.createArticle",
        op: "repository",
        attributes: { slug: input.slug },
      },
      async (span) => {
        try {
          const payload = await getPayload({ config: this.config });
          const created = await payload.create({
            collection: "articles",
            data: {
              title: input.title,
              slug: input.slug,
              content: input.content,
              status: input.status,
              author: input.authorId,
            } as never,
            overrideAccess: true,
          });
          span.setAttribute("id", String((created as PayloadArticleDoc).id));
          return mapDoc(created as PayloadArticleDoc);
        } catch (err) {
          this.logger.captureException(err, {
            tags: { feature: FEATURE, repo: REPO, method: "createArticle" },
          });
          span.setStatus(
            "error",
            err instanceof Error ? err.message : String(err),
          );
          throw err;
        }
      },
    );
  }

  async updateArticle(
    id: string,
    input: Partial<Article>,
  ): Promise<Article | undefined> {
    return this.tracer.startSpan(
      { name: "articles.updateArticle", op: "repository", attributes: { id } },
      async (span) => {
        try {
          const payload = await getPayload({ config: this.config });
          const updated = await payload.update({
            collection: "articles",
            id,
            data: {
              ...(input.title !== undefined && { title: input.title }),
              ...(input.slug !== undefined && { slug: input.slug }),
              ...(input.content !== undefined && { content: input.content }),
              ...(input.status !== undefined && { status: input.status }),
              ...(input.authorId !== undefined && { author: input.authorId }),
            } as never,
            overrideAccess: true,
          });
          span.setAttribute("found", true);
          return mapDoc(updated as PayloadArticleDoc);
        } catch (err) {
          if (
            err &&
            typeof err === "object" &&
            "status" in err &&
            (err as { status: unknown }).status === 404
          ) {
            span.setAttribute("found", false);
            return undefined;
          }
          this.logger.captureException(err, {
            tags: { feature: FEATURE, repo: REPO, method: "updateArticle" },
          });
          span.setStatus(
            "error",
            err instanceof Error ? err.message : String(err),
          );
          throw err;
        }
      },
    );
  }
}