import { chalkStderr } from "chalk";
import util from "util";
import ws from "ws";
import { ConvexHttpClient } from "../../browser/http_client.js";
import { BaseConvexClient } from "../../browser/index.js";
import {
  PaginationResult,
  UserIdentityAttributes,
  makeFunctionReference,
} from "../../server/index.js";
import { Value, convexToJson, jsonToConvex } from "../../values/value.js";
import { Context, OneoffCtx } from "../../bundler/context.js";
import { logFinishedStep, logMessage, logOutput } from "../../bundler/log.js";
import { waitForever, waitUntilCalled } from "./utils/utils.js";
import JSON5 from "json5";
import path from "path";
import { readProjectConfig } from "./config.js";
import { watchAndPush } from "./dev.js";
import { Logger, DefaultLogger } from "../../browser/logging.js";

export async function runFunctionAndLog(
  ctx: Context,
  args: {
    deploymentUrl: string;
    adminKey: string;
    functionName: string;
    argsString: string;
    identityString?: string | undefined;
    componentPath?: string | undefined;
    callbacks?:
      | {
          onSuccess?: () => void | undefined;
        }
      | undefined;
  },
) {
  const client = new ConvexHttpClient(args.deploymentUrl, {
    logger: instantiateStderrLogger(),
  });
  const identity = args.identityString
    ? await getFakeIdentity(ctx, args.identityString)
    : undefined;
  client.setAdminAuth(args.adminKey, identity);

  const functionArgs = await parseArgs(ctx, args.argsString);
  const { projectConfig } = await readProjectConfig(ctx);
  const parsedFunctionName = await parseFunctionName(
    ctx,
    args.functionName,
    projectConfig.functions,
  );
  let result: Value;
  try {
    result = await client.function(
      makeFunctionReference(parsedFunctionName),
      args.componentPath,
      functionArgs,
    );
  } catch (err) {
    const errorMessage = (err as Error).toString().trim();

    if (errorMessage.includes("Could not find function")) {
      const functions = (await runSystemQuery(ctx, {
        deploymentUrl: args.deploymentUrl,
        adminKey: args.adminKey,
        functionName: "_system/cli/modules:apiSpec",
        componentPath: args.componentPath,
        args: {},
      })) as (
        | {
            functionType: "Query" | "Mutation" | "Action";
            identifier: string;
          }
        | {
            functionType: "HttpAction";
          }
      )[];

      const functionNames = functions
        .filter(
          (
            fn,
          ): fn is {
            functionType: "Query" | "Mutation" | "Action";
            identifier: string;
          } => fn.functionType !== "HttpAction",
        )
        .map(({ identifier }) => {
          const separatorPos = identifier.indexOf(":");

          const path =
            separatorPos === -1
              ? ""
              : identifier.substring(0, separatorPos).replace(/\.js$/, "");
          const name =
            separatorPos === -1
              ? identifier
              : identifier.substring(separatorPos + 1);

          return `• ${chalkStderr.gray(`${path}:`)}${name}`;
        });

      const availableFunctionsMessage =
        functionNames.length > 0
          ? `Available functions:\n${functionNames.join("\n")}`
          : "No functions found.";

      return await ctx.crash({
        exitCode: 1,
        errorType: "invalid filesystem data",
        printedMessage: `Failed to run function "${args.functionName}":\n${chalkStderr.red(errorMessage)}\n\n${availableFunctionsMessage}`,
      });
    }

    return await ctx.crash({
      exitCode: 1,
      errorType: "invalid filesystem or env vars",
      printedMessage: `Failed to run function "${args.functionName}":\n${chalkStderr.red(errorMessage)}`,
    });
  }

  args.callbacks?.onSuccess?.();

  // `null` is the default return type
  if (result !== null) {
    logOutput(formatValue(result));
  }
}

async function getFakeIdentity(ctx: Context, identityString: string) {
  let identity: UserIdentityAttributes;
  try {
    identity = JSON5.parse(identityString);
  } catch (err) {
    return await ctx.crash({
      exitCode: 1,
      errorType: "fatal",
      printedMessage: `Failed to parse identity as JSON: "${identityString}"\n${chalkStderr.red((err as Error).toString().trim())}`,
    });
  }
  const subject = identity.subject ?? "" + simpleHash(JSON.stringify(identity));
  const issuer = identity.issuer ?? "https://convex.test";
  const tokenIdentifier =
    identity.tokenIdentifier ?? `${issuer.toString()}|${subject.toString()}`;
  return {
    ...identity,
    subject,
    issuer,
    tokenIdentifier,
  };
}

export async function parseArgs(ctx: Context, argsString: string) {
  try {
    const argsJson = JSON5.parse(argsString);
    return jsonToConvex(argsJson) as Record<string, Value>;
  } catch (err) {
    return await ctx.crash({
      exitCode: 1,
      errorType: "invalid filesystem or env vars",
      printedMessage: `Failed to parse arguments as JSON: "${argsString}"\n${chalkStderr.red((err as Error).toString().trim())}`,
    });
  }
}

export async function parseFunctionName(
  ctx: Context,
  functionName: string,
  // Usually `convex/` -- should contain trailing slash
  functionDirName: string,
) {
  // api.foo.bar -> foo:bar
  // foo/bar -> foo/bar:default
  // foo/bar:baz -> foo/bar:baz
  // convex/foo/bar -> foo/bar:default

  // This is the `api.foo.bar` format
  if (functionName.startsWith("api.") || functionName.startsWith("internal.")) {
    const parts = functionName.split(".");
    if (parts.length < 3) {
      return await ctx.crash({
        exitCode: 1,
        errorType: "fatal",
        printedMessage: `Function name has too few parts: "${functionName}"`,
      });
    }
    const exportName = parts.pop();
    const parsedName = `${parts.slice(1).join("/")}:${exportName}`;
    return parsedName;
  }

  // This is the `foo/bar:baz` format

  // This is something like `convex/foo/bar`, which could either be addressing `foo/bar:default` or `convex/foo/bar:default`
  // if there's a directory with the same name as the functions directory nested directly underneath.
  // We'll prefer the `convex/foo/bar:default` version, and check if the file exists, and otherwise treat this as a relative path from the project root.
  const filePath = functionName.split(":")[0];
  const possibleExtensions = [
    ".ts",
    ".js",
    ".tsx",
    ".jsx",
    ".mts",
    ".mjs",
    ".cts",
    ".cjs",
  ];
  let hasExtension = false;
  let normalizedFilePath: string = filePath;
  for (const extension of possibleExtensions) {
    if (filePath.endsWith(extension)) {
      normalizedFilePath = filePath.slice(0, -extension.length);
      hasExtension = true;
      break;
    }
  }

  const exportName = functionName.split(":")[1] ?? "default";
  const normalizedName = `${normalizedFilePath}:${exportName}`;

  // This isn't a relative path from the project root
  if (!filePath.startsWith(functionDirName)) {
    return normalizedName;
  }

  const filePathWithoutPrefix = normalizedFilePath.slice(
    functionDirName.length,
  );
  const functionNameWithoutPrefix = `${filePathWithoutPrefix}:${exportName}`;

  if (hasExtension) {
    if (ctx.fs.exists(path.join(functionDirName, filePath))) {
      return normalizedName;
    } else {
      return functionNameWithoutPrefix;
    }
  } else {
    const exists = possibleExtensions.some((extension) =>
      ctx.fs.exists(path.join(functionDirName, filePath + extension)),
    );
    if (exists) {
      return normalizedName;
    } else {
      return functionNameWithoutPrefix;
    }
  }
}

function simpleHash(string: string) {
  let hash = 0;
  for (let i = 0; i < string.length; i++) {
    const char = string.charCodeAt(i);
    hash = (hash << 5) - hash + char;
    hash = hash & hash; // Convert to 32bit integer
  }
  return hash;
}

export async function runSystemPaginatedQuery(
  ctx: Context,
  args: {
    deploymentUrl: string;
    adminKey: string;
    functionName: string;
    componentPath: string | undefined;
    args: Record<string, Value>;
    limit?: number;
  },
) {
  const results = [];
  let cursor = null;
  let isDone = false;
  while (!isDone && (args.limit === undefined || results.length < args.limit)) {
    const paginationResult = (await runSystemQuery(ctx, {
      ...args,
      args: {
        ...args.args,
        paginationOpts: {
          cursor,
          numItems:
            args.limit === undefined ? 10000 : args.limit - results.length,
        },
      },
    })) as unknown as PaginationResult<Record<string, Value>>;
    isDone = paginationResult.isDone;
    cursor = paginationResult.continueCursor;
    results.push(...paginationResult.page);
  }
  return results;
}

export async function runSystemQuery(
  ctx: Context,
  args: {
    deploymentUrl: string;
    adminKey: string;
    functionName: string;
    componentPath: string | undefined;
    args: Record<string, Value>;
  },
): Promise<Value> {
  let onResult: (result: Value) => void;
  const resultPromise = new Promise<Value>((resolve) => {
    onResult = resolve;
  });
  const [donePromise, onDone] = waitUntilCalled();
  await subscribe(ctx, {
    ...args,
    parsedFunctionName: args.functionName,
    parsedFunctionArgs: args.args,
    until: donePromise,
    callbacks: {
      onChange: (result) => {
        onDone();
        onResult(result);
      },
    },
  });
  return resultPromise;
}

export function formatValue(value: Value) {
  const json = convexToJson(value);
  if (process.stdout.isTTY) {
    // TODO (Tom) add JSON syntax highlighting like https://stackoverflow.com/a/51319962/398212
    // until then, just spit out something that isn't quite JSON because it's easy
    return util.inspect(value, { colors: true, depth: null });
  } else {
    return JSON.stringify(json, null, 2);
  }
}

export async function subscribeAndLog(
  ctx: Context,
  args: {
    deploymentUrl: string;
    adminKey: string;
    functionName: string;
    argsString: string;
    identityString?: string | undefined;
    componentPath: string | undefined;
  },
) {
  const { projectConfig } = await readProjectConfig(ctx);

  const parsedFunctionName = await parseFunctionName(
    ctx,
    args.functionName,
    projectConfig.functions,
  );
  const identity = args.identityString
    ? await getFakeIdentity(ctx, args.identityString)
    : undefined;
  const functionArgs = await parseArgs(ctx, args.argsString);
  return subscribe(ctx, {
    deploymentUrl: args.deploymentUrl,
    adminKey: args.adminKey,
    identity,
    parsedFunctionName,
    parsedFunctionArgs: functionArgs,
    componentPath: args.componentPath,
    until: waitForever(),
    callbacks: {
      onStart() {
        logFinishedStep(
          `Watching query ${args.functionName} on ${args.deploymentUrl}...`,
        );
      },
      onChange(result) {
        logOutput(formatValue(result));
      },
      onStop() {
        logMessage(`Closing connection to ${args.deploymentUrl}...`);
      },
    },
  });
}

export async function subscribe(
  _ctx: Context,
  args: {
    deploymentUrl: string;
    adminKey: string;
    identity?: UserIdentityAttributes | undefined;
    parsedFunctionName: string;
    parsedFunctionArgs: Record<string, Value>;
    componentPath: string | undefined;
    until: Promise<unknown>;
    callbacks?:
      | {
          onStart?: () => void;
          onChange?: (result: Value) => void;
          onStop?: () => void;
        }
      | undefined;
  },
) {
  const client = new BaseConvexClient(
    args.deploymentUrl,
    (updatedQueries) => {
      for (const queryToken of updatedQueries) {
        args.callbacks?.onChange?.(client.localQueryResultByToken(queryToken)!);
      }
    },
    {
      // pretend that a Node.js 'ws' library WebSocket is a browser WebSocket
      webSocketConstructor: ws as unknown as typeof WebSocket,
      unsavedChangesWarning: false,
    },
  );
  client.setAdminAuth(args.adminKey, args.identity);
  const { unsubscribe } = client.subscribe(
    args.parsedFunctionName,
    args.parsedFunctionArgs,
    {
      componentPath: args.componentPath,
    },
  );

  args.callbacks?.onStart?.();

  let done = false;
  const [donePromise, onDone] = waitUntilCalled();
  const stopWatching = () => {
    if (done) {
      return;
    }
    done = true;
    unsubscribe();
    void client.close();
    process.off("SIGINT", sigintListener);
    onDone();
    args.callbacks?.onStop?.();
  };
  function sigintListener() {
    stopWatching();
  }
  process.on("SIGINT", sigintListener);
  void args.until.finally(stopWatching);
  while (!done) {
    // loops once per day (any large value < 2**31 would work)
    const oneDay = 24 * 60 * 60 * 1000;
    await Promise.race([
      donePromise,
      new Promise((resolve) => setTimeout(resolve, oneDay)),
    ]);
  }
}

export async function runInDeployment(
  ctx: OneoffCtx,
  args: {
    deploymentUrl: string;
    adminKey: string;
    deploymentName: string | null;
    functionName: string;
    argsString: string;
    identityString?: string | undefined;
    push: boolean;
    watch: boolean;
    typecheck: "enable" | "try" | "disable";
    typecheckComponents: boolean;
    codegen: boolean;
    componentPath: string | undefined;
    liveComponentSources: boolean;
  },
) {
  if (args.push) {
    await watchAndPush(
      ctx,
      {
        url: args.deploymentUrl,
        adminKey: args.adminKey,
        deploymentName: args.deploymentName,
        verbose: false,
        dryRun: false,
        typecheck: args.typecheck,
        typecheckComponents: args.typecheckComponents,
        debug: false,
        debugNodeApis: false,
        codegen: args.codegen,
        liveComponentSources: args.liveComponentSources,
        pushAllModules: false,
        largeIndexDeletionCheck: "no verification", // `convex run` can’t push to prod
      },
      {
        once: true,
        traceEvents: false,
        untilSuccess: true,
      },
    );
  }

  if (args.watch) {
    return await subscribeAndLog(ctx, args);
  }
  return await runFunctionAndLog(ctx, args);
}

function instantiateStderrLogger(): Logger {
  const logger = new DefaultLogger({ verbose: false });
  logger.addLogLineListener((_level, ...args) => {
    // eslint-disable-next-line no-console
    console.error(...args);
  });
  return logger;
}