import path from "node:path";
import { pathToFileURL } from "node:url";
import type { RawConfig } from "@newmo/graphql-fake-core";
import type { LogLevel } from "./logger.js";

/**
 * Configuration for the fake server.
 */
export type FakeServerConfig = {
    /**
     * The path to the GraphQL schema file from cwd.
     */
    schemaFilePath: string;
    /**
     * The ports for the fake server and Apollo Server.
     */
    ports?:
        | {
              /**
               * Fake Server port.
               * Default is 4000.
               */
              fakeServer?: number | undefined;
              /**
               * Apollo Server port.
               * It provides the GraphQL Playground.
               * Default is 4002.
               */
              apolloServer?: number | undefined;
          }
        | undefined;
    /**
     * The maximum number of registered sequences.
     * Default is 1000.
     */
    maxRegisteredSequences?: number | undefined;
    /**
     * The maximum number of depth of field recursion.
     * Default is 9.
     */
    maxFieldRecursionDepth?: RawConfig["maxFieldRecursionDepth"] | undefined;
    /**
     * The maximum number of depth of complexity of query
     * this value should be maxFieldRecursionDepth + 1
     * Default is 10
     */
    maxQueryDepth?: number | undefined;
    /**
     * Default values for scalar types.
     */
    defaultValues?: RawConfig["defaultValues"] | undefined;
    /**
     * Log level: "debug", "info", "warn", "error"
     * If you want to see the debug logs, set the logLevel to "debug".
     * Default is "info".
     */
    logLevel?: LogLevel | undefined;
    /**
     * Additional origins to allow for CORS requests.
     * By default, only localhost and private IP ranges are allowed.
     * This option allows you to specify additional origins to accept.
     */
    allowedCORSOrigins?: string[] | undefined;
};
export type RequiredFakeServerConfig = {
    schemaFilePath: string;
    ports: {
        fakeServer: number;
        apolloServer: number;
    };
    maxRegisteredSequences: number;
    maxFieldRecursionDepth: number;
    maxQueryDepth: number;
    defaultValues: RawConfig["defaultValues"];
    logLevel: LogLevel;
    allowedCORSOrigins: string[];
};

export const normalizeFakeServerConfig = (config: FakeServerConfig): RequiredFakeServerConfig => {
    return {
        schemaFilePath: config.schemaFilePath,
        ports: {
            fakeServer: config.ports?.fakeServer ?? 4000,
            apolloServer: config.ports?.apolloServer ?? 4002,
        },
        maxRegisteredSequences: config.maxRegisteredSequences ?? 1000,
        maxFieldRecursionDepth: config.maxFieldRecursionDepth ?? 9,
        maxQueryDepth: config.maxQueryDepth ?? 10,
        defaultValues: config.defaultValues ?? {},
        logLevel: config.logLevel ?? "info",
        allowedCORSOrigins: config.allowedCORSOrigins ?? [],
    };
};
export const validateFakeServerConfig = (config: FakeServerConfig): FakeServerConfig => {
    if (!config.schemaFilePath) {
        throw new Error("The schemaFilePath is required.");
    }
    if (typeof config.schemaFilePath !== "string") {
        throw new Error("The schemaPath must be a string.");
    }
    if (config.ports) {
        if (typeof config.ports !== "object") {
            throw new Error("The ports must be an object.");
        }
        if (config.ports.fakeServer && typeof config.ports.fakeServer !== "number") {
            throw new Error("The fakeServer port must be a number.");
        }
        if (config.ports.apolloServer && typeof config.ports.apolloServer !== "number") {
            throw new Error("The apolloServer port must be a number.");
        }
    }
    if (config.maxRegisteredSequences && typeof config.maxRegisteredSequences !== "number") {
        throw new Error("The maxRegisteredSequences must be a number.");
    }
    if (config.maxFieldRecursionDepth && typeof config.maxFieldRecursionDepth !== "number") {
        throw new Error("The maxFieldRecursionDepth must be a number.");
    }
    if (config.maxQueryDepth && typeof config.maxQueryDepth !== "number") {
        throw new Error("The maxQueryDepth must be a number.");
    }
    if (config.defaultValues) {
        if (typeof config.defaultValues !== "object") {
            throw new Error("The defaultValues must be an object.");
        }
    }
    // ["debug", "info", "warn", "error"].includes(logLevel)
    if (config.logLevel && !["debug", "info", "warn", "error"].includes(config.logLevel)) {
        throw new Error("The logLevel must be one of 'debug', 'info', 'warn', 'error'.");
    }
    if (config.allowedCORSOrigins) {
        if (!Array.isArray(config.allowedCORSOrigins)) {
            throw new Error("The allowedCORSOrigins must be an array.");
        }
        for (const origin of config.allowedCORSOrigins) {
            if (typeof origin !== "string") {
                throw new Error("Each allowedCORSOrigin must be a string.");
            }
        }
    }
    return config;
};

/**
 * Load the fake server configuration from the file.
 * @param configPath
 */
export const loadConfig = async (
    cwd: string,
    configPath: string,
): Promise<RequiredFakeServerConfig> => {
    const fileUrl = pathToFileURL(path.resolve(cwd, configPath)).href;
    const { default: config } = await import(fileUrl);
    const normalizedConfig = normalizeFakeServerConfig(config);
    validateFakeServerConfig(normalizedConfig);
    return normalizedConfig;
};
/**
 * Load the fake server configuration from the CLI flags.
 * @param cliFlag
 */
export const loadFakeServerConfigFromCLI = ({
    schemaFilePath,
    logLevel,
}: {
    schemaFilePath?: string | undefined;
    logLevel?: LogLevel | undefined;
}): RequiredFakeServerConfig => {
    if (!schemaFilePath) {
        throw new Error(
            "The --schema is required. or pass --config ./fake-server.config.js to load the config file.",
        );
    }
    const normalizedConfig = normalizeFakeServerConfig({
        schemaFilePath,
        logLevel,
    });
    validateFakeServerConfig(normalizedConfig);
    return normalizedConfig;
};