import { createRouter } from '../../create-router';
import * as errors from '../../custom-errors';
import { listTasks, getTaskByDirName, createTask, deleteTask, readCategoryOrder } from './task-files';
import { runScriptTaskDirect } from './script-run';

type TriggerConfig = { type: 'file'; extensions: string[] } | { type: 'directory' };

export const tasksRouter = createRouter();

tasksRouter.get('/', async (ctx) => {
  const summaries = await listTasks();

  const tasks = summaries.map((row) => ({
    dirName: row.dirName,
    name: row.name,
    description: row.description,
    category: row.category,
    triggers: (row.trigger as TriggerConfig[]) ?? [],
    mode: row.mode ?? 'agentic',
    plugin: row.plugin,
    inline: row.inline,
    inputs: row.inputs,
  }));

  return ctx.json(tasks);
});

// Must be declared before '/:name', which would otherwise match "categories".
tasksRouter.get('/categories', async (ctx) => {
  return ctx.json(await readCategoryOrder());
});

tasksRouter.get('/:name', async (ctx) => {
  const name = ctx.req.param('name');

  const task = await getTaskByDirName(name);
  if (!task) return ctx.text('Not found', 404);

  return ctx.json({
    dirName: task.dirName,
    name: task.name,
    description: task.description,
    category: task.category,
    mode: task.mode,
    inline: task.inline,
    language: task.language,
    body: task.body,
    implementation: task.implementation,
    inputs: task.inputs,
    args: task.args,
    trigger: task.trigger,
    config: task.config,
    version: task.version,
    filePath: task.filePath,
    plugin: task.plugin,
  });
});

/**
 * POST /tasks/:name/run — run a script task, wait for it, return what it did.
 *
 * The entry point for a caller with no browser. Both existing runners need something watching them: the
 * socket needs a live connection to stream into, and a job needs somebody to open Jobs and read it. A
 * commander's loop has neither — it holds a credential, makes one call, and acts on the answer.
 *
 * Deliberately NOT a job. Transcribing a memo takes seconds and produces a file; wrapping it in a queue,
 * a row and a progress bar puts a screen nobody opened between the request and the result.
 *
 * Synchronous, so the caller's own timeout is the bound on how long a task may take. That is the honest
 * shape for "do this and tell me what happened" — a task that needs to outlive its caller should be a
 * job, and `POST /jobs` already is one.
 */
tasksRouter.post('/:name/run', async (ctx) => {
  const user = ctx.get('user');
  const name = ctx.req.param('name');

  const task = await getTaskByDirName(name);
  if (!task) throw errors.NOT_FOUND(`Task not found: ${name}`);
  if (task.mode !== 'script') throw errors.BAD_REQUEST(`Task mode '${task.mode}' cannot run directly`);

  type RunBody = { inputs?: Record<string, string>; cwd?: string };
  // A run with no inputs is a legitimate call, so an absent or unparseable body is an empty one rather
  // than a 400 — the task's own required-input check is the place that knows what it needs.
  const body: RunBody = await ctx.req.json<RunBody>().catch(() => ({}) as RunBody);

  try {
    const { code, output, taskName } = await runScriptTaskDirect({
      taskDirName: name,
      inputs: body.inputs ?? {},
      cwd: body.cwd,
      // The script inherits the caller's narrowing, or the absence of one. Without this a narrowed
      // credential could write a task and run it back at the API with full authority.
      user: {
        id: user.id,
        email: user.email,
        username: user.username ?? '',
        scope: ctx.get('credentialScope'),
      },
    });
    // A non-zero exit is reported, not thrown: the script ran, and its output is the useful part of the
    // answer either way. HTTP 200 means "the run happened"; `code` means "it worked".
    return ctx.json({ ok: code === 0, code, output, taskName });
  } catch (err) {
    throw errors.BAD_REQUEST(err instanceof Error ? err.message : 'Task failed to start');
  }
});

tasksRouter.post('/', async (ctx) => {
  const body = await ctx.req.json<{ name: string; description?: string; mode?: string; language?: string }>();

  if (!body.name?.trim()) return ctx.text('Name is required', 400);

  try {
    const task = await createTask({
      name: body.name,
      description: body.description ?? null,
      mode: body.mode ?? 'agentic',
      language: body.language ?? null,
    });
    return ctx.json(task);
  } catch (err) {
    const message = err instanceof Error ? err.message : 'Failed to create task';
    return ctx.text(message, message === 'Task already exists' ? 409 : 400);
  }
});

tasksRouter.delete('/:name', async (ctx) => {
  const name = ctx.req.param('name');

  const task = await getTaskByDirName(name);
  if (!task) return ctx.text('Not found', 404);
  // A plugin's task is its own file in its own checkout. Uninstalling the plugin is how it goes away.
  if (task.plugin) return ctx.text(`${name} belongs to the ${task.plugin} plugin — uninstall it instead`, 409);

  await deleteTask(task.dirName);
  return ctx.json({ ok: true });
});