import { addNode } from '../store';
import { getCaptureConfig, CaptureConfig } from './config';
import { extractMemoryData, shouldCapture, ExtractedMemory } from './summarize';
import { checkDuplicate, mergeIntoNode, linkRelatedNode } from './dedupe';
import { Node } from '../../types';

export { getCaptureConfig, setCaptureConfig, CaptureMode, CaptureConfig } from './config';
export { extractMemoryData, shouldCapture, ExtractedMemory } from './summarize';
export { findSimilarNodes, checkDuplicate, mergeIntoNode } from './dedupe';

export interface CaptureInput {
  conversation: string;
  sessionId?: string;
  filesChanged?: string[];
  source?: string;
}

export interface CaptureResult {
  captured: boolean;
  action: 'created' | 'merged' | 'linked' | 'skipped';
  node?: Node;
  reason?: string;
}

export async function captureConversation(input: CaptureInput): Promise<CaptureResult> {
  const config = getCaptureConfig();

  // Check if capture is enabled
  if (config.mode === 'off') {
    return { captured: false, action: 'skipped', reason: 'capture disabled' };
  }

  // Check minimum length
  if (!shouldCapture(input.conversation, config.minLength)) {
    return { captured: false, action: 'skipped', reason: 'conversation too short or trivial' };
  }

  // Check exclude patterns
  for (const pattern of config.excludePatterns) {
    try {
      if (new RegExp(pattern, 'i').test(input.conversation)) {
        return { captured: false, action: 'skipped', reason: `matched exclude pattern: ${pattern}` };
      }
    } catch {
      // Invalid regex, skip
    }
  }

  // Extract memory data using Ollama
  const extracted = await extractMemoryData(input.conversation);
  if (!extracted) {
    return { captured: false, action: 'skipped', reason: 'failed to extract memory data' };
  }

  // For "decisions" mode, only capture if decisions were found
  if (config.mode === 'decisions' && extracted.decisions.length === 0) {
    return { captured: false, action: 'skipped', reason: 'no decisions found (decisions mode)' };
  }

  // Build content
  const contentParts: string[] = [extracted.summary];

  if (extracted.decisions.length > 0) {
    contentParts.push('\n## Decisions');
    for (const d of extracted.decisions) {
      contentParts.push(`- ${d}`);
    }
  }

  if (extracted.filesDiscussed.length > 0 || input.filesChanged?.length) {
    const files = [...new Set([...extracted.filesDiscussed, ...(input.filesChanged || [])])];
    contentParts.push('\n## Files');
    for (const f of files) {
      contentParts.push(`- ${f}`);
    }
  }

  const content = contentParts.join('\n');

  // Check for duplicates
  const dedupeResult = await checkDuplicate(extracted.summary, content);

  // Build tags
  const tags = ['auto-capture'];
  if (config.autoTag && extracted.topics.length > 0) {
    tags.push(...extracted.topics);
  }
  if (input.source) {
    tags.push(`source:${input.source}`);
  }

  if (dedupeResult.action === 'merge' && dedupeResult.existingNode) {
    // Merge into existing node
    const merged = await mergeIntoNode(
      dedupeResult.existingNode.id,
      extracted.summary,
      content,
      tags
    );
    return {
      captured: true,
      action: 'merged',
      node: merged || undefined,
      reason: `merged with existing node (similarity: ${(dedupeResult.similarity! * 100).toFixed(1)}%)`,
    };
  }

  // Create new node
  const node = await addNode({
    kind: 'memory',
    title: extracted.summary.slice(0, 100),
    content,
    tags,
    status: 'active',
    metadata: {
      sessionId: input.sessionId,
      filesChanged: input.filesChanged,
      source: input.source || 'claude-code',
      capturedAt: Date.now(),
      decisions: extracted.decisions,
    },
  });

  // Link to related node if found
  if (dedupeResult.action === 'link' && dedupeResult.existingNode && config.linkRelated) {
    await linkRelatedNode(node.id, dedupeResult.existingNode.id);
    return {
      captured: true,
      action: 'linked',
      node,
      reason: `linked to related node (similarity: ${(dedupeResult.similarity! * 100).toFixed(1)}%)`,
    };
  }

  return {
    captured: true,
    action: 'created',
    node,
  };
}

export async function captureText(
  text: string,
  options: { tags?: string[]; source?: string } = {}
): Promise<CaptureResult> {
  const config = getCaptureConfig();

  if (config.mode === 'off') {
    return { captured: false, action: 'skipped', reason: 'capture disabled' };
  }

  // Simple text capture - no summarization needed
  const dedupeResult = await checkDuplicate(text, text);

  const tags = ['manual-capture', ...(options.tags || [])];
  if (options.source) {
    tags.push(`source:${options.source}`);
  }

  if (dedupeResult.action === 'merge' && dedupeResult.existingNode) {
    const merged = await mergeIntoNode(
      dedupeResult.existingNode.id,
      text.slice(0, 100),
      text,
      tags
    );
    return {
      captured: true,
      action: 'merged',
      node: merged || undefined,
    };
  }

  const node = await addNode({
    kind: 'memory',
    title: text.slice(0, 100),
    content: text,
    tags,
    status: 'active',
    metadata: {
      source: options.source || 'manual',
      capturedAt: Date.now(),
    },
  });

  if (dedupeResult.action === 'link' && dedupeResult.existingNode && config.linkRelated) {
    await linkRelatedNode(node.id, dedupeResult.existingNode.id);
    return { captured: true, action: 'linked', node };
  }

  return { captured: true, action: 'created', node };
}