/**
 * Quality Review Dispatch Hook
 *
 * Intercepts agent:stopped events and, when conditions are met, spawns
 * a fresh execute-mode agent to run /simplify on changed files before
 * the task reaches 'completed' status.
 */

import type { BranchManager } from '../git/branch-manager.js';
import type { AgentManager } from '../agent/types.js';
import type { AgentRepository } from '../db/repositories/agent-repository.js';
import type { TaskRepository } from '../db/repositories/task-repository.js';
import type { InitiativeRepository } from '../db/repositories/initiative-repository.js';
import type { PhaseRepository } from '../db/repositories/phase-repository.js';
import { phaseBranchName, taskBranchName } from '../git/branch-naming.js';
import type { createModuleLogger } from '../logger/index.js';

type Logger = ReturnType<typeof createModuleLogger>;

// ---------------------------------------------------------------------------
// computeQualifyingFiles
// ---------------------------------------------------------------------------

/**
 * Returns the list of .ts/.tsx/.js files changed between taskBranch and baseBranch,
 * excluding generated files and dist artifacts.
 */
export async function computeQualifyingFiles(
  branchManager: BranchManager,
  repoPath: string,
  taskBranch: string,
  baseBranch: string,
): Promise<string[]> {
  try {
    const entries = await branchManager.diffBranchesStat(repoPath, baseBranch, taskBranch);
    return entries
      .map((e) => e.path)
      .filter(
        (p) =>
          /\.(ts|tsx|js)$/.test(p) &&
          !p.endsWith('.gen.ts') &&
          !p.startsWith('dist/') &&
          !p.includes('/dist/'),
      );
  } catch {
    return [];
  }
}

// ---------------------------------------------------------------------------
// shouldRunQualityReview
// ---------------------------------------------------------------------------

interface ShouldRunParams {
  agentId: string;
  taskId: string;
  stopReason: string;
  agentRepository: AgentRepository;
  taskRepository: TaskRepository;
  initiativeRepository: InitiativeRepository;
  phaseRepository: PhaseRepository;
  branchManager: BranchManager;
  repoPath: string;
}

/**
 * Evaluates whether a quality review should be run for the stopped agent.
 * Returns `{ run: true, qualifyingFiles }` only when all conditions pass.
 * Short-circuits on first false condition.
 */
export async function shouldRunQualityReview(
  params: ShouldRunParams,
): Promise<{ run: boolean; qualifyingFiles: string[] }> {
  const {
    agentId,
    taskId,
    stopReason,
    agentRepository,
    taskRepository,
    initiativeRepository,
    phaseRepository,
    branchManager,
    repoPath,
  } = params;

  const NO = { run: false, qualifyingFiles: [] };

  // 1. Only act on task_complete stops
  if (stopReason !== 'task_complete') return NO;

  // 2. Agent must be in execute mode (guards against errand agents)
  const agent = await agentRepository.findById(agentId);
  if (!agent || agent.mode !== 'execute') return NO;

  // 3. Task must be in_progress; quality_review is the recursion guard
  const task = await taskRepository.findById(taskId);
  if (!task) return NO;
  if (task.status === 'quality_review') return NO;
  if (task.status !== 'in_progress') return NO;

  // 4. Task must belong to an initiative
  if (!task.initiativeId) return NO;

  // 5. Initiative must have qualityReview enabled
  const initiative = await initiativeRepository.findById(task.initiativeId);
  if (!initiative || initiative.qualityReview !== true) return NO;

  // 6. Compute branch names from task context
  if (!task.phaseId) return NO;
  const phase = await phaseRepository.findById(task.phaseId);
  if (!phase) return NO;

  const initBranch = initiative.branch;
  if (!initBranch) return NO;

  const base = phaseBranchName(initBranch, phase.name);
  const branch = taskBranchName(initBranch, task.id);

  // 7. Must have qualifying files in the changeset
  const qualifyingFiles = await computeQualifyingFiles(branchManager, repoPath, branch, base);
  if (qualifyingFiles.length === 0) return NO;

  return { run: true, qualifyingFiles };
}

// ---------------------------------------------------------------------------
// runQualityReview
// ---------------------------------------------------------------------------

interface RunQualityReviewParams {
  taskId: string;
  taskBranch: string;
  baseBranch: string;
  initiativeId: string;
  qualifyingFiles: string[];
  taskRepository: TaskRepository;
  agentManager: AgentManager;
  log: Logger;
}

/**
 * Transitions the task to quality_review and spawns a fresh execute-mode
 * agent to run /simplify on the changed files.
 *
 * On spawn failure: marks task completed and returns (never throws).
 */
export async function runQualityReview(params: RunQualityReviewParams): Promise<void> {
  const { taskId, taskBranch, baseBranch, initiativeId, qualifyingFiles, taskRepository, agentManager, log } = params;

  // 1. Transition BEFORE spawning
  await taskRepository.update(taskId, { status: 'quality_review' });

  // 2. Build prompt
  const fileList = qualifyingFiles.map((f) => `- ${f}`).join('\n');
  const reviewPrompt = `Run /simplify to review and fix code quality in this branch.\n\nFiles changed in this task:\n${fileList}`;

  // 3. Spawn fresh execute-mode agent on the same task branch
  try {
    const reviewAgent = await agentManager.spawn({
      taskId,
      initiativeId,
      prompt: reviewPrompt,
      mode: 'execute',
      baseBranch,
      branchName: taskBranch,
    });

    // 4. Log success
    log.info({ taskId, reviewAgentId: reviewAgent.id }, 'quality review agent spawned');
  } catch (err) {
    // 5. On spawn failure: mark completed and return — never block task completion
    log.error({ taskId, err }, 'quality review spawn failed; marking task completed');
    await taskRepository.update(taskId, { status: 'completed' });
  }
}