import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import {
  discoverModuleSchemas,
  ModuleDiscoveryError,
  ModuleSchemaDiscoveryError,
  type ModuleSchemaDiscoveryIssueCode,
} from "../src/modules/index.js";

interface SchemaModuleFixture {
  readonly manifest?: Record<string, unknown>;
  readonly packageJson?: Record<string, unknown>;
  readonly schemaSource?: string;
  readonly serverSource?: string;
}

const drizzlePgCoreUrl = import.meta.resolve("drizzle-orm/pg-core");
const temporaryDirectories: string[] = [];
const eventSymbols: symbol[] = [];

afterEach(async () => {
  const globalValues = globalThis as unknown as Record<PropertyKey, unknown>;
  for (const symbol of eventSymbols.splice(0)) {
    delete globalValues[symbol];
  }
  await Promise.all(
    temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true })),
  );
});

async function createModulesDirectory(): Promise<string> {
  const directory = await mkdtemp(path.join(tmpdir(), "ekklesia-schema-"));
  temporaryDirectories.push(directory);
  return directory;
}

function manifestFor(
  id: string,
  options: { dependencies?: Record<string, unknown>; schema?: string | false } = {},
): Record<string, unknown> {
  return {
    manifestVersion: 6,
    id,
    name: `${id} module`,
    version: "0.1.0",
    compatibility: { platform: "^0.1.0", moduleSdk: "^0.1.0" },
    ...(options.dependencies ? { dependencies: options.dependencies } : {}),
    capabilities: [],
    permissions: [],
    entrypoints: {
      server: "./dist/server/index.js",
      ...(options.schema === false ? {} : { schema: options.schema ?? "./dist/schema/index.js" }),
    },
  };
}

async function createSchemaModule(
  modulesDirectory: string,
  id: string,
  fixture: SchemaModuleFixture = {},
): Promise<void> {
  const moduleDirectory = path.join(modulesDirectory, id);
  await mkdir(path.join(moduleDirectory, "dist/server"), { recursive: true });
  if (fixture.schemaSource !== undefined) {
    await mkdir(path.join(moduleDirectory, "dist/schema"), { recursive: true });
  }
  await Promise.all([
    writeFile(
      path.join(moduleDirectory, "package.json"),
      JSON.stringify(
        fixture.packageJson ?? {
          name: `@test/module-${id}`,
          version: "0.1.0",
          type: "module",
          ekklesia: { layer: "module" },
        },
      ),
    ),
    writeFile(
      path.join(moduleDirectory, "ekklesia.module.json"),
      JSON.stringify(fixture.manifest ?? manifestFor(id)),
    ),
    writeFile(
      path.join(moduleDirectory, "dist/server/index.js"),
      fixture.serverSource ?? `export default { id: ${JSON.stringify(id)}, version: "0.1.0" };`,
    ),
    ...(fixture.schemaSource === undefined
      ? []
      : [writeFile(path.join(moduleDirectory, "dist/schema/index.js"), fixture.schemaSource)]),
  ]);
}

function createGlobalEventRecorder(): { events: string[]; expression: string } {
  const key = `ekklesia.schema.test.${eventSymbols.length}.${Date.now()}.${Math.random()}`;
  const symbol = Symbol.for(key);
  const events: string[] = [];
  (globalThis as unknown as Record<PropertyKey, unknown>)[symbol] = events;
  eventSymbols.push(symbol);
  return { events, expression: `globalThis[Symbol.for(${JSON.stringify(key)})]` };
}

function discoveryOptions(modulesDirectory: string) {
  return {
    moduleSdkVersion: "0.1.0",
    modulesDirectory,
    platformVersion: "0.1.0",
  };
}

async function captureSchemaError(modulesDirectory: string): Promise<ModuleSchemaDiscoveryError> {
  try {
    await discoverModuleSchemas(discoveryOptions(modulesDirectory));
  } catch (error) {
    if (error instanceof ModuleSchemaDiscoveryError) {
      return error;
    }
    throw error;
  }
  throw new Error("Expected module schema discovery to fail.");
}

function issueCodes(error: ModuleSchemaDiscoveryError): ModuleSchemaDiscoveryIssueCode[] {
  return error.issues.map((issue) => issue.code);
}

describe("module schema discovery", () => {
  it("returns a frozen empty aggregate without importing module servers", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createGlobalEventRecorder();
    await createSchemaModule(modulesDirectory, "server-only", {
      manifest: manifestFor("server-only", { schema: false }),
      serverSource: `${recorder.expression}.push("server-imported"); export default { id: "server-only", version: "0.1.0" };`,
    });

    const aggregate = await discoverModuleSchemas(discoveryOptions(modulesDirectory));

    expect(aggregate.discoveredModules).toHaveLength(1);
    expect(aggregate.modules).toEqual([]);
    expect(aggregate.tables).toEqual([]);
    expect(aggregate.drizzleSchema).toEqual({});
    expect(recorder.events).toEqual([]);
    expect(Object.isFrozen(aggregate)).toBe(true);
    expect(Object.isFrozen(aggregate.tables)).toBe(true);
  });

  it("completes all static module discovery before importing any schema code", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createGlobalEventRecorder();
    await createSchemaModule(modulesDirectory, "valid", {
      schemaSource: `${recorder.expression}.push("schema-imported"); export default {};`,
    });
    await createSchemaModule(modulesDirectory, "missing-schema");

    let discoveryError: ModuleDiscoveryError | undefined;
    try {
      await discoverModuleSchemas(discoveryOptions(modulesDirectory));
    } catch (error) {
      if (error instanceof ModuleDiscoveryError) {
        discoveryError = error;
      } else {
        throw error;
      }
    }
    expect(discoveryError?.issues).toContainEqual(
      expect.objectContaining({
        code: "MODULE_ENTRYPOINT_MISSING",
        moduleId: "missing-schema",
        path: "entrypoints.schema",
      }),
    );
    expect(recorder.events).toEqual([]);
  });

  it("loads and aggregates module tables deterministically", async () => {
    const modulesDirectory = await createModulesDirectory();
    const recorder = createGlobalEventRecorder();
    await createSchemaModule(modulesDirectory, "calendar", {
      manifest: manifestFor("calendar", {
        dependencies: { modules: { required: { people: "^0.1.0" } } },
      }),
      schemaSource: `
        import { integer, pgTable, text } from ${JSON.stringify(drizzlePgCoreUrl)};
        ${recorder.expression}.push("calendar:schema");
        const events = pgTable("calendar_events", { id: integer("id").primaryKey() });
        const locations = pgTable("calendar_locations", {
          id: integer("id").primaryKey(),
          eventId: integer("event_id").references(() => events.id)
        });
        export default { moduleId: "calendar", tables: { locations, events } };
      `,
      serverSource: 'throw new Error("server entrypoint must remain unloaded");',
    });
    await createSchemaModule(modulesDirectory, "people", {
      schemaSource: `
        import { integer, pgTable, text } from ${JSON.stringify(drizzlePgCoreUrl)};
        ${recorder.expression}.push("people:schema");
        const records = pgTable("people_records", { id: integer("id").primaryKey() });
        const notes = pgTable("people_notes", {
          id: integer("id").primaryKey(),
          recordId: integer("record_id").references(() => records.id),
          body: text("body")
        });
        export default { moduleId: "people", tables: { records, notes } };
      `,
    });

    const aggregate = await discoverModuleSchemas(discoveryOptions(modulesDirectory));

    expect(recorder.events).toEqual(["people:schema", "calendar:schema"]);
    expect(aggregate.modules.map((module) => module.moduleId)).toEqual(["people", "calendar"]);
    expect(aggregate.modules[0]?.tables.map((table) => table.exportName)).toEqual([
      "notes",
      "records",
    ]);
    expect(aggregate.modules[1]?.tables.map((table) => table.exportName)).toEqual([
      "events",
      "locations",
    ]);
    expect(aggregate.tables.map((table) => table.name)).toEqual([
      "calendar_events",
      "calendar_locations",
      "people_notes",
      "people_records",
    ]);
    expect(Object.keys(aggregate.drizzleSchema)).toEqual(
      aggregate.tables.map((table) => table.name),
    );
    expect(Object.isFrozen(aggregate.modules)).toBe(true);
    expect(Object.isFrozen(aggregate.drizzleSchema)).toBe(true);
    expect(Object.isFrozen(aggregate.modules[0])).toBe(true);
    expect(Object.isFrozen(aggregate.modules[0]?.tables)).toBe(true);
    expect(Object.isFrozen(aggregate.tables[0])).toBe(true);
  });

  it("aggregates import, export, and ownership-marker failures without leaking details", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "alpha", {
      schemaSource: 'throw new Error("database-password at /machine/private/path");',
    });
    await createSchemaModule(modulesDirectory, "beta", {
      schemaSource: 'export default { moduleId: "beta", tables: { rows: {} } };',
    });
    await createSchemaModule(modulesDirectory, "gamma", {
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        const rows = pgTable("gamma_rows", { id: integer("id") });
        export default { moduleId: "wrong", tables: { rows } };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);

    expect(issueCodes(error)).toEqual([
      "MODULE_SCHEMA_IMPORT_FAILED",
      "MODULE_SCHEMA_EXPORT_INVALID",
      "MODULE_SCHEMA_MODULE_ID_MISMATCH",
    ]);
    const report = `${error.message}\n${error.stack}\n${JSON.stringify(error.issues)}`;
    expect(report).not.toContain("database-password");
    expect(report).not.toContain("/machine/private/path");
    expect(report).not.toContain(modulesDirectory);
  });

  it("rejects malformed, unnamespaced, duplicate, and custom-schema tables", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "example", {
      schemaSource: `
        import { integer, pgSchema, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        const duplicateA = pgTable("example_records", { id: integer("id") });
        const duplicateB = pgTable("example_records", { id: integer("id") });
        const invalid = pgTable("secret at /machine/path", { id: integer("id") });
        const invalidLocal = pgTable("example_1records", { id: integer("id") });
        const other = pgTable("other_records", { id: integer("id") });
        const privateTable = pgSchema("private").table("example_private", { id: integer("id") });
        export default {
          moduleId: "example",
          tables: {
            repeated: duplicateA,
            privateTable,
            other,
            invalid,
            invalidLocal,
            duplicateB,
            duplicateA
          }
        };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);

    expect(issueCodes(error)).toEqual(
      expect.arrayContaining([
        "MODULE_SCHEMA_POSTGRES_SCHEMA_UNSUPPORTED",
        "MODULE_SCHEMA_TABLE_DUPLICATE",
        "MODULE_SCHEMA_TABLE_NAME_INVALID",
        "MODULE_SCHEMA_TABLE_NAMESPACE_INVALID",
      ]),
    );
    expect(
      issueCodes(error).filter((code) => code === "MODULE_SCHEMA_TABLE_DUPLICATE"),
    ).toHaveLength(2);
    expect(
      issueCodes(error).filter((code) => code === "MODULE_SCHEMA_TABLE_NAME_INVALID"),
    ).toHaveLength(2);
    expect(JSON.stringify(error.issues)).not.toContain("secret at /machine/path");
  });

  it("rejects duplicate physical names across module namespaces", async () => {
    const modulesDirectory = await createModulesDirectory();
    for (const [moduleId, exportName] of [
      ["foo", "barRows"],
      ["foo-bar", "rows"],
    ] as const) {
      await createSchemaModule(modulesDirectory, moduleId, {
        schemaSource: `
          import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
          const table = pgTable("foo_bar_rows", { id: integer("id") });
          export default { moduleId: ${JSON.stringify(moduleId)}, tables: { ${exportName}: table } };
        `,
      });
    }

    const error = await captureSchemaError(modulesDirectory);
    expect(error.issues).toEqual([
      expect.objectContaining({
        code: "MODULE_SCHEMA_TABLE_DUPLICATE",
        moduleId: "foo-bar",
        tableName: "foo_bar_rows",
      }),
    ]);
  });

  it("rejects cross-module and omitted local foreign-key targets", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "people", {
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        export const records = pgTable("people_records", { id: integer("id").primaryKey() });
        export default { moduleId: "people", tables: { records } };
      `,
    });
    await createSchemaModule(modulesDirectory, "calendar", {
      manifest: manifestFor("calendar", {
        dependencies: { modules: { required: { people: "^0.1.0" } } },
      }),
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        import { records } from "../../../people/dist/schema/index.js";
        const privateTable = pgTable("calendar_private", { id: integer("id").primaryKey() });
        const events = pgTable("calendar_events", {
          id: integer("id"),
          personId: integer("person_id").references(() => records.id)
        });
        const attendees = pgTable("calendar_attendees", {
          id: integer("id"),
          privateId: integer("private_id").references(() => privateTable.id)
        });
        export default { moduleId: "calendar", tables: { events, attendees } };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);

    expect(issueCodes(error)).toEqual([
      "MODULE_SCHEMA_FOREIGN_KEY_TARGET_MISSING",
      "MODULE_SCHEMA_CROSS_MODULE_FOREIGN_KEY",
    ]);
  });

  it("rejects compound foreign keys that mix target-table ownership", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "people", {
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        export const records = pgTable("people_records", {
          id: integer("id").notNull(),
          alternateId: integer("alternate_id").notNull()
        });
        export default { moduleId: "people", tables: { records } };
      `,
    });
    await createSchemaModule(modulesDirectory, "calendar", {
      manifest: manifestFor("calendar", {
        dependencies: { modules: { required: { people: "^0.1.0" } } },
      }),
      schemaSource: `
        import { foreignKey, integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        import { records } from "../../../people/dist/schema/index.js";
        const targets = pgTable("calendar_targets", {
          id: integer("id").notNull(),
          alternateId: integer("alternate_id").notNull()
        });
        const links = pgTable("calendar_links", {
          targetId: integer("target_id").notNull(),
          alternateId: integer("alternate_id").notNull()
        }, (table) => [
          foreignKey({
            columns: [table.targetId, table.alternateId],
            foreignColumns: [targets.id, records.alternateId]
          })
        ]);
        export default { moduleId: "calendar", tables: { links, targets } };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);
    expect(issueCodes(error)).toEqual(["MODULE_SCHEMA_FOREIGN_KEY_INVALID"]);
  });

  it("rejects table aliases and sanitizes hostile metadata proxies", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "alias-table", {
      schemaSource: `
        import { alias, integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        const base = pgTable("private_records", { id: integer("id") });
        const records = alias(base, "alias_table_records");
        export default { moduleId: "alias-table", tables: { records } };
      `,
    });
    await createSchemaModule(modulesDirectory, "proxy-table", {
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        const base = pgTable("proxy_table_records", { id: integer("id") });
        const aliasSymbol = Symbol.for("drizzle:IsAlias");
        let aliasReads = 0;
        const records = new Proxy(base, {
          get(target, key, receiver) {
            if (key === aliasSymbol && ++aliasReads > 1) {
              throw new Error("proxy-secret at /machine/private/schema");
            }
            return Reflect.get(target, key, receiver);
          }
        });
        export default { moduleId: "proxy-table", tables: { records } };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);
    expect(issueCodes(error)).toEqual([
      "MODULE_SCHEMA_EXPORT_INVALID",
      "MODULE_SCHEMA_TABLE_INVALID",
    ]);
    const report = `${error.stack}\n${JSON.stringify(error.issues)}`;
    expect(report).not.toContain("proxy-secret");
    expect(report).not.toContain("/machine/private/schema");
  });

  it("sanitizes errors thrown while resolving lazy foreign-key metadata", async () => {
    const modulesDirectory = await createModulesDirectory();
    await createSchemaModule(modulesDirectory, "unsafe", {
      schemaSource: `
        import { integer, pgTable } from ${JSON.stringify(drizzlePgCoreUrl)};
        const rows = pgTable("unsafe_rows", {
          id: integer("id"),
          ownerId: integer("owner_id").references(() => {
            throw new Error("foreign-key-secret at /machine/schema/path");
          })
        });
        export default { moduleId: "unsafe", tables: { rows } };
      `,
    });

    const error = await captureSchemaError(modulesDirectory);
    expect(issueCodes(error)).toEqual(["MODULE_SCHEMA_FOREIGN_KEY_INVALID"]);
    expect(JSON.stringify(error.issues)).not.toContain("foreign-key-secret");
    expect(JSON.stringify(error.issues)).not.toContain("/machine/schema/path");
  });

  it("produces schema diagnostics independent of the absolute modules path", async () => {
    const firstModulesDirectory = await createModulesDirectory();
    const secondModulesDirectory = await createModulesDirectory();
    for (const modulesDirectory of [firstModulesDirectory, secondModulesDirectory]) {
      await createSchemaModule(modulesDirectory, "broken", {
        schemaSource: 'throw new Error("secret at /machine/schema/path");',
      });
    }

    const [firstError, secondError] = await Promise.all([
      captureSchemaError(firstModulesDirectory),
      captureSchemaError(secondModulesDirectory),
    ]);

    expect(firstError.issues).toEqual(secondError.issues);
    expect(firstError.stack).toBe(secondError.stack);
  });
});