import { getPayload, Payload } from "payload";
import config from "@/payload.config";

import { afterAll, beforeAll, describe, expect, it } from "vitest";
import type { User, WikiPage, WikiRevision, WikiTemplate } from "@/payload-types";
import {
  createPage,
  deletePage,
  listTemplates,
  restoreRevision,
  setPageLockdown,
  templateMap,
  updatePage,
} from "@/lib/wiki/service";
import { slugify } from "@/lib/wiki/slugify";
import { expandTemplates } from "@/lib/wiki/templates";
import { preprocessWikilinks } from "@/lib/wiki/wikilinks";
import { prepareMarkdown } from "@/lib/wiki/prepare";

let payload: Payload;

const RUN = `wiki-${Date.now().toString(36)}`;

describe("Wiki", () => {
  let user: User;
  let userId: number;
  const pageIds: number[] = [];
  const templateIds: number[] = [];

  beforeAll(async () => {
    const payloadConfig = await config;
    payload = await getPayload({ config: payloadConfig });

    user = (await payload.create({
      collection: "users",
      data: {
        username: `${RUN}-user`,
        discordUsername: `${RUN}-user`,
        displayName: "WIKI TEST",
        steamId: `7656119${Math.floor(Math.random() * 1e9)}`,
        password: "Test123",
        roles: ["user"],
      },
      overrideAccess: true,
      depth: 0,
    })) as unknown as User;
    userId = user.id;
  });

  afterAll(async () => {
    // Revisions reference the page, so delete them before the page itself.
    for (const id of pageIds) {
      const revisions = await payload
        .find({
          collection: "wiki-revisions",
          where: { page: { equals: id } },
          limit: 500,
          depth: 0,
          overrideAccess: true,
        })
        .catch(() => null);
      for (const revision of revisions?.docs ?? []) {
        await payload
          .delete({ collection: "wiki-revisions", id: revision.id, overrideAccess: true })
          .catch(() => {});
      }
      await payload
        .delete({ collection: "wiki-pages", id, overrideAccess: true })
        .catch(() => {});
    }
    for (const id of templateIds) {
      await payload
        .delete({ collection: "wiki-templates", id, overrideAccess: true })
        .catch(() => {});
    }
    // User deletion trips FK constraints unless the hook-provisioned
    // personal bank account and profile are removed first.
    const accounts = await payload
      .find({
        collection: "bank-accounts",
        where: { ownerUser: { equals: userId } },
        limit: 5,
        depth: 0,
        overrideAccess: true,
      })
      .catch(() => null);
    for (const account of accounts?.docs ?? []) {
      await payload
        .delete({ collection: "bank-accounts", id: account.id, overrideAccess: true })
        .catch(() => {});
    }
    const profiles = await payload
      .find({
        collection: "profiles",
        where: { user: { equals: userId } },
        limit: 5,
        depth: 0,
        overrideAccess: true,
      })
      .catch(() => null);
    for (const profile of profiles?.docs ?? []) {
      await payload
        .delete({ collection: "profiles", id: profile.id, overrideAccess: true })
        .catch(() => {});
    }
    await payload
      .delete({ collection: "users", id: userId, overrideAccess: true })
      .catch(() => {});
  });

  const fetchRevisions = async (pageId: number): Promise<WikiRevision[]> => {
    const result = (await payload.find({
      collection: "wiki-revisions",
      where: { page: { equals: pageId } },
      sort: "revisionNumber",
      limit: 500,
      depth: 0,
      overrideAccess: true,
    })) as unknown as { docs: WikiRevision[] };
    return result.docs;
  };

  const makePage = async (
    title: string,
    body = "Body",
    category: WikiPage["category"] = "Lore",
    tags?: string[],
  ): Promise<WikiPage> => {
    const page = await createPage(payload, user, { title, category, body, tags });
    pageIds.push(page.id);
    return page;
  };

  describe("slugify", () => {
    it("lowercases, trims, and collapses non-alphanumerics into single hyphens", () => {
      expect(slugify("Hello World!")).toBe("hello-world");
      expect(slugify("  A--B  ")).toBe("a-b");
      expect(slugify("Café")).toBe("caf");
      expect(slugify("123")).toBe("123");
      expect(slugify("")).toBe("page");
      expect(slugify("!!!")).toBe("page");
    });
  });

  describe("expandTemplates", () => {
    it("replaces a basic template placeholder", () => {
      expect(expandTemplates("Hello {{T}}!", { T: "world" })).toBe("Hello world!");
    });

    it("leaves unknown templates literal", () => {
      expect(expandTemplates("{{Nope}}", {})).toBe("{{Nope}}");
    });

    it("expands two templates on one line", () => {
      expect(expandTemplates("{{A}} and {{B}}", { A: "x", B: "y" })).toBe("x and y");
    });

    it("trims whitespace inside placeholders before matching", () => {
      expect(expandTemplates("{{ A }}", { A: "x" })).toBe("x");
    });

    it("expands 2 levels of nesting and leaves the 3rd level literal", () => {
      expect(expandTemplates("{{A}}", { A: "{{B}}", B: "hello" })).toBe("hello");
      expect(expandTemplates("{{A}}", { A: "{{B}}", B: "{{C}}", C: "deep" })).toBe("{{C}}");
    });

    it("terminates cycles leaving the cycle literal", () => {
      expect(expandTemplates("{{A}}", { A: "{{A}}" })).toBe("{{A}}");
      expect(expandTemplates("{{A}}", { A: "{{B}}", B: "{{A}}" })).toBe("{{A}}");
    });
  });

  describe("preprocessWikilinks", () => {
    it("converts a plain wikilink to a markdown link with the slugified target", () => {
      expect(preprocessWikilinks("See [[Page Title]]")).toBe(
        "See [Page Title](/wiki/page-title)",
      );
    });

    it("uses the alias text as the link label", () => {
      expect(preprocessWikilinks("[[Page Title|Custom Text]]")).toBe(
        "[Custom Text](/wiki/page-title)",
      );
    });

    it("trims whitespace around the target and alias", () => {
      expect(preprocessWikilinks("[[  Page Title  |  Custom  ]]")).toBe(
        "[Custom](/wiki/page-title)",
      );
    });

    it("handles multiple links on one line", () => {
      expect(preprocessWikilinks("[[Alpha]] and [[Beta|B]]")).toBe(
        "[Alpha](/wiki/alpha) and [B](/wiki/beta)",
      );
    });
  });

  describe("prepareMarkdown", () => {
    it("expands templates first, then wikilinks", () => {
      const templates = { T: "See [[Page Title]]" };
      expect(prepareMarkdown("{{T}}", templates)).toBe("See [Page Title](/wiki/page-title)");
    });
  });

  describe("service", () => {
    it("createPage creates the page and exactly one create revision", async () => {
      const title = `${RUN} Create`;
      const page = await makePage(title, "Initial body", "World");
      expect(page.slug).toBe(slugify(title));
      expect(page.category).toBe("World");
      expect(page.tags ?? []).toEqual([]);

      const revisions = await fetchRevisions(page.id);
      expect(revisions).toHaveLength(1);
      expect(revisions[0].revisionNumber).toBe(1);
      expect(revisions[0].type).toBe("create");
      expect(revisions[0].titleSnapshot).toBe(title);
      expect(revisions[0].contentSnapshot).toBe("Initial body");
    });

    it("createPage stores tags", async () => {
      const page = await makePage(`${RUN} Tags`, "Body", "Guides", ["alpha", "beta"]);
      expect(page.tags).toEqual(["alpha", "beta"]);
    });

    it("updatePage snapshots the old content as the next revision and updates the page", async () => {
      const page = await makePage(`${RUN} Update`, "v1 body", "Lore");
      const updated = await updatePage(payload, user, page, {
        body: "v2 body",
        category: "Guides",
        tags: ["x", "y"],
        summary: "edit",
      });

      expect(updated.body).toBe("v2 body");
      expect(updated.category).toBe("Guides");
      expect(updated.tags).toEqual(["x", "y"]);
      expect(updated.lastEditor).toBe(userId);

      const revisions = await fetchRevisions(page.id);
      expect(revisions).toHaveLength(2);
      expect(revisions[1].revisionNumber).toBe(2);
      expect(revisions[1].type).toBe("edit");
      expect(revisions[1].titleSnapshot).toBe(page.title);
      expect(revisions[1].contentSnapshot).toBe("v1 body");
    });

    it("updatePage rename produces a new unique slug", async () => {
      const page = await makePage(`${RUN} Rename`, "body");
      const renamed = await updatePage(payload, user, page, { title: `${RUN} Renamed` });
      expect(renamed.title).toBe(`${RUN} Renamed`);
      expect(renamed.slug).toBe(slugify(`${RUN} Renamed`));
    });

    it("restoreRevision restores content from the target revision and records a restore revision", async () => {
      const page = await makePage(`${RUN} Restore`, "original body");
      const edited = await updatePage(payload, user, page, { body: "edited body" });

      const restored = await restoreRevision(payload, user, edited, 1);
      expect(restored.title).toBe(page.title);
      expect(restored.body).toBe("original body");

      const revisions = await fetchRevisions(page.id);
      expect(revisions).toHaveLength(3);
      expect(revisions[2].revisionNumber).toBe(3);
      expect(revisions[2].type).toBe("restore");
      expect(revisions[2].restoredFromRevision).toBe(1);
      expect(revisions[2].titleSnapshot).toBe(page.title);
      expect(revisions[2].contentSnapshot).toBe("original body");
    });

    it("restoreRevision restores the title and re-slugs when the title changed", async () => {
      const page = await makePage(`${RUN} RestoreTitle`, "body");
      const renamed = await updatePage(payload, user, page, {
        title: `${RUN} RestoreTitle Renamed`,
      });
      expect(renamed.slug).toBe(slugify(`${RUN} RestoreTitle Renamed`));

      const restored = await restoreRevision(payload, user, renamed, 1);
      expect(restored.title).toBe(`${RUN} RestoreTitle`);
      expect(restored.slug).toBe(slugify(`${RUN} RestoreTitle`));
    });

    it("restoreRevision throws when the revision does not exist", async () => {
      const page = await makePage(`${RUN} MissingRev`, "body");
      await expect(restoreRevision(payload, user, page, 99)).rejects.toThrow(
        "Revision 99 not found for this page.",
      );
    });

    it("creates a unique slug with a -2 suffix for a duplicate title", async () => {
      const title = `${RUN} Duplicate`;
      const first = await makePage(title, "a");
      const second = await makePage(title, "b");
      expect(first.slug).toBe(slugify(title));
      expect(second.slug).toBe(`${slugify(title)}-2`);
    });

    it("setPageLockdown blocks edits and unlock allows them again", async () => {
      const page = await makePage(`${RUN} Lock`, "body");

      const locked = await setPageLockdown(payload, user, page, true);
      expect(locked.lockdown).toBe(true);
      expect(locked.lockedBy).toBe(userId);
      expect(locked.lockedAt).toBeTruthy();

      await expect(updatePage(payload, user, locked, { body: "nope" })).rejects.toThrow(
        "This page is locked and cannot be edited.",
      );
      await expect(restoreRevision(payload, user, locked, 1)).rejects.toThrow(
        "This page is locked and cannot be edited.",
      );

      const unlocked = await setPageLockdown(payload, user, locked, false);
      expect(unlocked.lockdown).toBe(false);
      expect(unlocked.lockedBy).toBeNull();
      expect(unlocked.lockedAt).toBeNull();

      const updated = await updatePage(payload, user, unlocked, { body: "yes" });
      expect(updated.body).toBe("yes");
    });

    it("deletePage removes the page and all of its revisions", async () => {
      const page = await makePage(`${RUN} Delete`, "body");
      await updatePage(payload, user, page, { body: "v2" });

      await deletePage(payload, user, page);

      const pages = (await payload.find({
        collection: "wiki-pages",
        where: { id: { equals: page.id } },
        limit: 1,
        depth: 0,
        overrideAccess: true,
      })) as unknown as { docs: WikiPage[] };
      expect(pages.docs).toHaveLength(0);
      expect(await fetchRevisions(page.id)).toHaveLength(0);
    });

    it("listTemplates returns created templates and templateMap maps name to body", async () => {
      const t1 = (await payload.create({
        collection: "wiki-templates",
        data: { name: `${RUN}-tpl-a`, body: "Template A body" },
        overrideAccess: true,
        depth: 0,
      })) as unknown as WikiTemplate;
      templateIds.push(t1.id);
      const t2 = (await payload.create({
        collection: "wiki-templates",
        data: { name: `${RUN}-tpl-b`, body: "Template B body" },
        overrideAccess: true,
        depth: 0,
      })) as unknown as WikiTemplate;
      templateIds.push(t2.id);

      const templates = await listTemplates(payload);
      const map = templateMap(templates);
      expect(map[`${RUN}-tpl-a`]).toBe("Template A body");
      expect(map[`${RUN}-tpl-b`]).toBe("Template B body");
    });
  });
});