import { createInterface } from "node:readline";

import { z } from "incur";
import type { Logger } from "pino";

import { captureDesktopApplication } from "../application/desktop/DesktopApplicationCapture.js";
import type { DesktopStateReaders } from "../application/desktop/DesktopApplicationState.js";
import { AnalysisError } from "../domain/analysisErrorBase.js";
import type { Evidence } from "../domain/evidence.js";
import { err, ok } from "../domain/result.js";
import { finishAnalysisCommand } from "./finishAnalysisCommand.js";
import { projectCliAnalysisResult } from "./projectCliAnalysisResult.js";
import { absoluteCallerPath } from "../filesystem/callerPath.js";
import { cliDecimalField } from "./options.js";
import { CLI_COMMANDS } from "../cliCommandNames.js";
import { logCliCommand } from "../cliLogging.js";
import { DESKTOP_CAPTURE_DEFAULTS } from "../domain/desktop/desktopCapture.js";
import { SessionRequestQueue } from "../desktop/DesktopSessionRequests.js";
import { withCommandCancellation } from "./commandCancellation.js";
import type { CliInstance } from "./types.js";

const positive = (fallback: number) =>
  cliDecimalField(z.int().positive().default(fallback));

/** Options of `capture-desktop-application`. */
const captureOptions = z.object({
  desktopEntry: z
    .string()
    .min(1)
    .optional()
    .describe("Desktop entry id (org.xfce.mousepad) or absolute .desktop path"),
  executable: z
    .string()
    .min(1)
    .optional()
    .describe(
      "Executable path or program name on PATH, instead of a desktop entry",
    ),
  // An empty argument reaches the application as is. Path options refuse
  // one, because normalizing it would select the current directory.
  argument: z
    .array(z.string())
    .optional()
    .describe("Argument appended to the launch command (repeatable)"),
  output: z
    .string()
    .min(1)
    .describe("New or empty directory for capture.json and retained content"),
  statePath: z
    .array(z.string().min(1))
    .optional()
    .describe(
      "File or directory whose starting content is retained in addition to the application's state directories; a file brings its SQLite write-ahead log and rollback journal (repeatable)",
    ),
  exclude: z
    .array(z.string().min(1))
    .optional()
    .describe("Path left out of every checkpoint walk (repeatable)"),
  maxDurationSeconds: positive(
    DESKTOP_CAPTURE_DEFAULTS.maxDurationSeconds,
  ).describe("Stop the session after this many seconds"),
  maxEntries: positive(DESKTOP_CAPTURE_DEFAULTS.maxEntries).describe(
    "Maximum paths recorded per checkpoint walk",
  ),
  maxFileBytes: positive(DESKTOP_CAPTURE_DEFAULTS.maxFileBytes).describe(
    "Largest file whose content is retained",
  ),
  maxContentBytes: positive(DESKTOP_CAPTURE_DEFAULTS.maxContentBytes).describe(
    "Total retained content",
  ),
  packageFile: z
    .string()
    .optional()
    .describe(
      "The .deb file the application was installed from; its control fields, SHA-256 and size are recorded, never the file",
    ),
});

/** The checkpoints a bundle's seed and a task's end state are read at. */
const checkpointOptions = {
  seedCheckpoint: z
    .string()
    .optional()
    .describe(
      "Checkpoint whose state seeds the bundle; the baseline by default",
    ),
  endCheckpoint: z
    .string()
    .optional()
    .describe(
      "Checkpoint whose state a task must pass on; the capture's last by default",
    ),
};

/**
 * Run a desktop operation with SQLite and dconf readers, finishing through
 * the shared command owner so the result, cancellation and the SQLite
 * service's cleanup are all kept. The readers load here, so registering the
 * command catalog never loads them.
 */
const withStateReaders = async (
  environment: NodeJS.ProcessEnv,
  signal: AbortSignal,
  operation: string,
  run: (readers: DesktopStateReaders) => Promise<Evidence | AnalysisError>,
) => {
  const [
    { createSqliteDatabaseService },
    { readSqliteStateView },
    { dumpDconfDatabase },
  ] = await Promise.all([
    import("../composition/sqlite.js"),
    import("../application/desktop/DesktopSqliteState.js"),
    import("../desktop/DconfDatabaseReader.js"),
  ]);
  const sqlite = createSqliteDatabaseService(environment);
  return finishAnalysisCommand(
    async () => {
      const result = await run({
        sqlite: (database, readSignal) =>
          readSqliteStateView(sqlite, database, readSignal),
        dconf: (database, readSignal) =>
          dumpDconfDatabase(database, environment, readSignal),
      });
      return result instanceof AnalysisError ? err(result) : ok(result);
    },
    sqlite,
    "rea-desktop",
    operation,
    signal,
  ).then(projectCliAnalysisResult);
};

/** Register the export of a capture folder as a computer app bundle. */
const registerDesktopExportCommand = (
  cli: CliInstance,
  logger: Logger,
  environment: NodeJS.ProcessEnv,
): void => {
  cli.command(CLI_COMMANDS.exportDesktopApplication, {
    description:
      "Export a desktop application capture folder as an agentenv computer app bundle: class, env.toml, skill and seed",
    args: z.object({
      capture: z
        .string()
        .describe("Folder written by capture-desktop-application"),
      directory: z.string().describe("New or empty bundle directory"),
    }),
    options: z.object({
      name: z
        .string()
        .optional()
        .describe(
          "Environment name; defaults to one derived from the application",
        ),
      task: z
        .array(z.string())
        .optional()
        .describe(
          "Task file to validate against the capture and add with its verifier and eval; a capture yields one",
        ),
      packageUrl: z
        .string()
        .optional()
        .describe(
          "http or https URL the computer downloads the captured --package-file from when the bundle is put, for an application installed from a .deb file",
        ),
      ...checkpointOptions,
    }),
    run: ({ args, options }) =>
      withCommandCancellation((signal) =>
        logCliCommand(
          logger,
          CLI_COMMANDS.exportDesktopApplication,
          async () => {
            const { exportDesktopApplication } =
              await import("../application/desktop/DesktopApplicationExport.js");
            return withStateReaders(
              environment,
              signal,
              "export_desktop_application",
              (readers) =>
                exportDesktopApplication(
                  {
                    capture: absoluteCallerPath(args.capture),
                    directory: absoluteCallerPath(args.directory),
                    name: options.name,
                    tasks: (options.task ?? []).map((path) =>
                      absoluteCallerPath(path),
                    ),
                    packageUrl: options.packageUrl,
                    seedCheckpoint: options.seedCheckpoint,
                    endCheckpoint: options.endCheckpoint,
                  },
                  readers,
                  signal,
                ),
            );
          },
        ),
      ),
  });
};

/** Register the change summary an agent writes a task from. */
const registerDesktopTaskCommand = (
  cli: CliInstance,
  logger: Logger,
  environment: NodeJS.ProcessEnv,
): void => {
  cli.command(CLI_COMMANDS.describeDesktopApplicationTask, {
    description:
      "Describe how a desktop application capture's files changed from the seed checkpoint to the end, with suggested checks and a task draft to complete for export-desktop-application --task",
    args: z.object({
      capture: z
        .string()
        .describe("Folder written by capture-desktop-application"),
    }),
    options: z.object(checkpointOptions),
    run: ({ args, options }) =>
      withCommandCancellation((signal) =>
        logCliCommand(
          logger,
          CLI_COMMANDS.describeDesktopApplicationTask,
          async () => {
            const { draftDesktopApplicationTask } =
              await import("../application/desktop/DesktopTaskDraft.js");
            return withStateReaders(
              environment,
              signal,
              "describe_desktop_application_task",
              (readers) =>
                draftDesktopApplicationTask(
                  absoluteCallerPath(args.capture),
                  readers,
                  signal,
                  { seed: options.seedCheckpoint, end: options.endCheckpoint },
                ),
            );
          },
        ),
      ),
  });
};

/** Register the state view over a capture folder. */
const registerDesktopStateCommand = (
  cli: CliInstance,
  logger: Logger,
  environment: NodeJS.ProcessEnv,
): void => {
  cli.command(CLI_COMMANDS.inspectDesktopApplicationState, {
    description:
      "Read a desktop application capture folder into the application's state: roles, typed JSON views of each version and kinds of change",
    args: z.object({
      capture: z
        .string()
        .describe("Folder written by capture-desktop-application"),
    }),
    run: ({ args }) =>
      withCommandCancellation((signal) =>
        logCliCommand(
          logger,
          CLI_COMMANDS.inspectDesktopApplicationState,
          async () => {
            const { inspectDesktopApplicationState } =
              await import("../application/desktop/DesktopApplicationState.js");
            return withStateReaders(
              environment,
              signal,
              "inspect_desktop_application_state",
              (readers) =>
                inspectDesktopApplicationState(
                  absoluteCallerPath(args.capture),
                  readers,
                  signal,
                ),
            );
          },
        ),
      ),
  });
};

/** Register the interactive Linux desktop application capture. */
export const registerDesktopCaptureCommands = (
  cli: CliInstance,
  logger: Logger,
  environment: NodeJS.ProcessEnv,
): void => {
  registerDesktopStateCommand(cli, logger, environment);
  registerDesktopExportCommand(cli, logger, environment);
  registerDesktopTaskCommand(cli, logger, environment);
  cli.command(CLI_COMMANDS.captureDesktopApplication, {
    description:
      "Launch a Linux desktop application, watch it while it is used and record its windows and state at checkpoints read from stdin",
    options: captureOptions,
    run: ({ options }) =>
      withCommandCancellation((signal) =>
        logCliCommand(
          logger,
          CLI_COMMANDS.captureDesktopApplication,
          async () => {
            const requests = new SessionRequestQueue(
              createInterface({ input: process.stdin, terminal: false }),
            );
            try {
              return await captureDesktopApplication(
                {
                  desktopEntry: options.desktopEntry,
                  executable: options.executable,
                  arguments: options.argument ?? [],
                  output: options.output,
                  statePaths: options.statePath ?? [],
                  excludes: options.exclude ?? [],
                  maxDurationSeconds: options.maxDurationSeconds,
                  maxEntries: options.maxEntries,
                  maxFileBytes: options.maxFileBytes,
                  maxContentBytes: options.maxContentBytes,
                  packageFile:
                    options.packageFile === undefined
                      ? undefined
                      : absoluteCallerPath(options.packageFile),
                },
                {
                  platform: process.platform,
                  environment,
                  callerDirectory: process.cwd(),
                  nextRequest: () => requests.next(),
                  report: async (message) => {
                    process.stderr.write(
                      `${JSON.stringify({ rea_progress: { phase: "desktop_capture", message } })}\n`,
                    );
                  },
                },
                signal,
              );
            } finally {
              requests.close();
            }
          },
        ),
      ),
  });
};