import { describe, expect, it } from "vitest";
import {
  isModuleHttpMethod,
  MODULE_HTTP_METHODS,
  MODULE_ROUTE_MAX_BODY_BYTES_CEILING,
  type ModuleRouteDefinitionInput,
  moduleRoutePathSchema,
  moduleRouteShapeKey,
  parseModuleRouteDefinition,
  parseModuleRoutePath,
  safeParseModuleRouteDefinition,
  safeParseModuleRoutePath,
} from "../src/index.js";

function noopHandler(): Response {
  return new Response(null, { status: 204 });
}

function validDefinition(
  overrides: Partial<ModuleRouteDefinitionInput> = {},
): ModuleRouteDefinitionInput {
  return {
    method: "GET",
    path: "/events/:eventId",
    permission: "calendar.events.read",
    maxBodyBytes: 0,
    handler: noopHandler,
    ...overrides,
  };
}

describe("ModuleHttpMethod", () => {
  it("accepts every supported method", () => {
    for (const method of MODULE_HTTP_METHODS) {
      expect(isModuleHttpMethod(method)).toBe(true);
    }
    expect(MODULE_HTTP_METHODS).toEqual(["DELETE", "GET", "PATCH", "POST", "PUT"]);
  });

  it("rejects lowercase, unknown, OPTIONS, HEAD, and wildcard methods", () => {
    for (const method of ["get", "post", "TRACE", "OPTIONS", "HEAD", "*", "ALL", ""]) {
      expect(isModuleHttpMethod(method)).toBe(false);
    }
    expect(isModuleHttpMethod(42)).toBe(false);
    expect(isModuleHttpMethod(undefined)).toBe(false);
  });
});

describe("moduleRoutePathSchema", () => {
  it("accepts the root, static, nested, and parameterized canonical paths", () => {
    for (const path of [
      "/",
      "/events",
      "/events/upcoming",
      "/events/:eventId",
      "/events/:eventId/attendees/:attendeeId",
    ]) {
      expect(parseModuleRoutePath(path)).toBe(path);
    }
  });

  it("rejects paths that do not begin with /", () => {
    expect(safeParseModuleRoutePath("events").success).toBe(false);
    expect(safeParseModuleRoutePath("").success).toBe(false);
  });

  it("rejects a non-root path ending with /", () => {
    expect(safeParseModuleRoutePath("/events/").success).toBe(false);
  });

  it("rejects empty and repeated segments", () => {
    expect(safeParseModuleRoutePath("/events//upcoming").success).toBe(false);
    expect(safeParseModuleRoutePath("//events").success).toBe(false);
  });

  it("rejects query strings and fragments", () => {
    expect(safeParseModuleRoutePath("/events?limit=10").success).toBe(false);
    expect(safeParseModuleRoutePath("/events#upcoming").success).toBe(false);
  });

  it("rejects backslashes and percent-encoded path syntax", () => {
    expect(safeParseModuleRoutePath("/events\\upcoming").success).toBe(false);
    expect(safeParseModuleRoutePath("/events%2Fupcoming").success).toBe(false);
    expect(safeParseModuleRoutePath("/%2e%2e/events").success).toBe(false);
  });

  it("rejects dot segments and traversal syntax", () => {
    expect(safeParseModuleRoutePath("/events/..").success).toBe(false);
    expect(safeParseModuleRoutePath("/events/.").success).toBe(false);
    expect(safeParseModuleRoutePath("/../events").success).toBe(false);
  });

  it("rejects wildcard or catch-all segments", () => {
    expect(safeParseModuleRoutePath("/events/*").success).toBe(false);
    expect(safeParseModuleRoutePath("/events/**").success).toBe(false);
    expect(safeParseModuleRoutePath("/*").success).toBe(false);
  });

  it("rejects non-kebab-case static segments", () => {
    expect(safeParseModuleRoutePath("/Events").success).toBe(false);
    expect(safeParseModuleRoutePath("/events_list").success).toBe(false);
    expect(safeParseModuleRoutePath("/events--upcoming").success).toBe(false);
    expect(safeParseModuleRoutePath("/-events").success).toBe(false);
    expect(safeParseModuleRoutePath("/events-").success).toBe(false);
  });

  it("rejects a malformed parameter segment", () => {
    expect(safeParseModuleRoutePath("/events/:").success).toBe(false);
    expect(safeParseModuleRoutePath("/events/:Event-Id").success).toBe(false);
    expect(safeParseModuleRoutePath("/events/:1id").success).toBe(false);
  });

  it("rejects duplicate parameter names within one path", () => {
    expect(safeParseModuleRoutePath("/events/:id/attendees/:id").success).toBe(false);
  });

  it("rejects an unreasonably long path", () => {
    expect(safeParseModuleRoutePath(`/${"a".repeat(300)}`).success).toBe(false);
  });

  it("never echoes the rejected raw path in its issue messages", () => {
    const secret = "/machine/private/path/traversal-attempt-%2e%2e";
    const result = moduleRoutePathSchema.safeParse(secret);
    expect(result.success).toBe(false);
    expect(JSON.stringify(result.error?.issues)).not.toContain(secret);
  });
});

describe("moduleRouteShapeKey", () => {
  it("collapses different parameter names into the same shape for the same method", () => {
    const eventId = parseModuleRoutePath("/events/:eventId");
    const id = parseModuleRoutePath("/events/:id");
    expect(moduleRouteShapeKey("GET", eventId)).toBe(moduleRouteShapeKey("GET", id));
  });

  it("distinguishes shapes by method and by static path structure", () => {
    const path = parseModuleRoutePath("/events/:eventId");
    expect(moduleRouteShapeKey("GET", path)).not.toBe(moduleRouteShapeKey("POST", path));
    expect(moduleRouteShapeKey("GET", parseModuleRoutePath("/events"))).not.toBe(
      moduleRouteShapeKey("GET", parseModuleRoutePath("/events/:eventId")),
    );
  });

  it("treats the root path as its own shape", () => {
    expect(moduleRouteShapeKey("GET", parseModuleRoutePath("/"))).toBe("GET /");
  });
});

describe("safeParseModuleRouteDefinition", () => {
  it("accepts a well-formed definition and brands its path and permission", () => {
    const result = safeParseModuleRouteDefinition(validDefinition());
    expect(result.success).toBe(true);
    if (result.success) {
      expect(result.data).toEqual({
        method: "GET",
        path: "/events/:eventId",
        permission: "calendar.events.read",
        maxBodyBytes: 0,
        handler: noopHandler,
      });
      expect(Object.isFrozen(result.data)).toBe(true);
    }
  });

  it("rejects a non-object, null, or array definition", () => {
    for (const value of [null, undefined, "route", 42, []]) {
      expect(safeParseModuleRouteDefinition(value)).toEqual({
        success: false,
        code: "MODULE_ROUTE_DEFINITION_INVALID",
      });
    }
  });

  it("rejects an unknown route-definition field", () => {
    expect(safeParseModuleRouteDefinition({ ...validDefinition(), baseline: "public" })).toEqual({
      success: false,
      code: "MODULE_ROUTE_DEFINITION_INVALID",
    });
    expect(
      safeParseModuleRouteDefinition({ ...validDefinition(), mountPrefix: "/custom" }),
    ).toEqual({ success: false, code: "MODULE_ROUTE_DEFINITION_INVALID" });
  });

  it("rejects a missing required field", () => {
    const { handler: _handler, ...withoutHandler } = validDefinition();
    expect(safeParseModuleRouteDefinition(withoutHandler)).toEqual({
      success: false,
      code: "MODULE_ROUTE_DEFINITION_INVALID",
    });
  });

  it("rejects a non-function handler", () => {
    expect(
      safeParseModuleRouteDefinition({ ...validDefinition(), handler: "not-a-function" }),
    ).toEqual({ success: false, code: "MODULE_ROUTE_DEFINITION_INVALID" });
  });

  it("rejects an invalid method", () => {
    expect(safeParseModuleRouteDefinition({ ...validDefinition(), method: "get" })).toEqual({
      success: false,
      code: "MODULE_ROUTE_METHOD_INVALID",
    });
  });

  it("rejects an invalid path", () => {
    expect(safeParseModuleRouteDefinition({ ...validDefinition(), path: "events" })).toEqual({
      success: false,
      code: "MODULE_ROUTE_PATH_INVALID",
    });
  });

  it("rejects an invalid permission id", () => {
    expect(
      safeParseModuleRouteDefinition({ ...validDefinition(), permission: "not namespaced" }),
    ).toEqual({ success: false, code: "MODULE_ROUTE_PERMISSION_INVALID" });
    expect(safeParseModuleRouteDefinition({ ...validDefinition(), permission: "*" })).toEqual({
      success: false,
      code: "MODULE_ROUTE_PERMISSION_INVALID",
    });
  });

  it("accepts a maxBodyBytes of exactly zero (no body accepted) and exactly the platform ceiling", () => {
    expect(safeParseModuleRouteDefinition(validDefinition({ maxBodyBytes: 0 })).success).toBe(true);
    const atCeiling = safeParseModuleRouteDefinition(
      validDefinition({ maxBodyBytes: MODULE_ROUTE_MAX_BODY_BYTES_CEILING }),
    );
    expect(atCeiling.success).toBe(true);
    if (atCeiling.success) {
      expect(atCeiling.data.maxBodyBytes).toBe(MODULE_ROUTE_MAX_BODY_BYTES_CEILING);
    }
  });

  it("rejects a negative, non-integer, non-finite, or over-ceiling maxBodyBytes", () => {
    for (const maxBodyBytes of [
      -1,
      1.5,
      Number.NaN,
      Number.POSITIVE_INFINITY,
      Number.NEGATIVE_INFINITY,
      MODULE_ROUTE_MAX_BODY_BYTES_CEILING + 1,
    ]) {
      expect(safeParseModuleRouteDefinition(validDefinition({ maxBodyBytes }))).toEqual({
        success: false,
        code: "MODULE_ROUTE_MAX_BODY_BYTES_INVALID",
      });
    }
  });

  it("rejects a non-numeric or missing maxBodyBytes", () => {
    expect(
      safeParseModuleRouteDefinition({ ...validDefinition(), maxBodyBytes: "0" }),
    ).toMatchObject({ success: false, code: "MODULE_ROUTE_MAX_BODY_BYTES_INVALID" });
    const { maxBodyBytes: _maxBodyBytes, ...withoutMaxBodyBytes } = validDefinition();
    expect(safeParseModuleRouteDefinition(withoutMaxBodyBytes)).toEqual({
      success: false,
      code: "MODULE_ROUTE_DEFINITION_INVALID",
    });
  });

  it("does not retain the caller's mutable definition object: mutating it afterward cannot change the parsed result", () => {
    const source = { ...validDefinition() };
    const result = safeParseModuleRouteDefinition(source);
    expect(result.success).toBe(true);
    source.method = "POST";
    source.path = "/mutated";
    source.permission = "mutated.permission.id";
    if (result.success) {
      expect(result.data.method).toBe("GET");
      expect(result.data.path).toBe("/events/:eventId");
      expect(result.data.permission).toBe("calendar.events.read");
    }
  });
});

describe("parseModuleRouteDefinition", () => {
  it("returns the parsed definition for valid input", () => {
    expect(parseModuleRouteDefinition(validDefinition())).toMatchObject({
      method: "GET",
      path: "/events/:eventId",
      permission: "calendar.events.read",
    });
  });

  it("throws without echoing the rejected input", () => {
    const secret = "secret-token-value";
    expect(() => parseModuleRouteDefinition({ ...validDefinition(), permission: secret })).toThrow(
      "Invalid Ekklesia module route definition.",
    );
    try {
      parseModuleRouteDefinition({ ...validDefinition(), permission: secret });
      throw new Error("expected parseModuleRouteDefinition to throw");
    } catch (error) {
      expect(String(error)).not.toContain(secret);
    }
  });
});