import { VclawError } from './errors.js';
import type { FilmmakingPromptsArtifact } from './filmmaking-prompts.js';
import { lintFilmmakingPrompts } from './prompt-lint.js';
import type { VideoExecutionTask } from './types.js';
import { existsSync } from 'node:fs';
import { resolve } from 'node:path';
import { anchorManifestAssetPath } from './asset-spec.js';

/** Validate the resolved request, after reference merging and prompt additions. */
export function validateFinalFilmmakingRequests(
  artifact: FilmmakingPromptsArtifact | null,
  tasks: VideoExecutionTask[],
  projectDir: string,
): void {
  const policy = artifact;
  if (policy?.validationProfile !== 'cinematic-v1') return;
  const failures: Array<{ sceneIndex: number; code: string; message: string }> = [];
  const finalPackets = tasks.flatMap((task) => {
    const packet = policy.seedancePackets.find((item) => item.sceneIndex === task.sceneIndex);
    if (!packet) {
      failures.push({ sceneIndex: task.sceneIndex, code: 'packet-missing', message: 'Regenerate cinematic prompt packets for this scene.' });
      return [];
    }
    for (const reference of packet.references) {
      if (reference.status !== 'ready' || !reference.path) {
        failures.push({ sceneIndex: task.sceneIndex, code: 'reference-pending', message: `${reference.slot} has no reviewed, ready reference.` });
      // The task carries the path as the render anchored it (a relative packet
      // path becomes the project file); the packet here is the artifact as
      // written, so it is anchored the same way before the two are compared.
      } else if (!task.referencePaths.includes(reference.path) && !task.referencePaths.includes(anchorManifestAssetPath(projectDir, reference.path))) {
        failures.push({ sceneIndex: task.sceneIndex, code: 'reference-dropped', message: `${reference.slot} was removed from the final request; rebuild the packet with the actual reference set.` });
      } else if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(reference.path) && !existsSync(resolve(projectDir, anchorManifestAssetPath(projectDir, reference.path)))) {
        failures.push({ sceneIndex: task.sceneIndex, code: 'reference-file-missing', message: `${reference.slot} points to a missing local file.` });
      }
    }
    if (!task.prompt.trim()) failures.push({ sceneIndex: task.sceneIndex, code: 'empty-prompt', message: 'The final prompt is empty.' });
    return [{ ...packet, promptText: task.prompt, durationSeconds: task.durationSeconds ?? packet.durationSeconds }];
  });
  const lint = lintFilmmakingPrompts({ ...policy, seedancePackets: finalPackets, storyboardGridPrompt: null }, { register: policy.promptRegister ?? 'prose' });
  for (const packet of lint.packets) {
    for (const issue of packet.issues.filter((item) => item.severity === 'error')) {
      failures.push({ sceneIndex: packet.sceneIndex, code: issue.code, message: issue.message });
    }
  }
  if (failures.length) throw new VclawError('invalid_flag_value', 'Cinematic request validation failed before submission.', { failures });
}