import { Command } from 'commander';
import chalk from 'chalk';
import { captureConversation, captureText, getCaptureConfig, setCaptureConfig, CaptureMode } from '../../core/capture';

const VALID_MODES: CaptureMode[] = ['always', 'manual', 'decisions', 'off'];

export const captureCommand = new Command('capture')
  .description('Capture text or conversation as a memory node')
  .argument('[text]', 'Text to capture (or pipe via stdin)')
  .option('--tags <tags>', 'Comma-separated tags')
  .option('--source <source>', 'Source identifier', 'manual')
  .action(async (text: string | undefined, opts) => {
    let content = text;

    // Read from stdin if no text provided
    if (!content) {
      content = await readStdin();
    }

    if (!content || content.trim().length === 0) {
      console.error(chalk.red('No text provided. Pass text as argument or pipe via stdin.'));
      process.exit(1);
    }

    const tags = opts.tags ? opts.tags.split(',').map((t: string) => t.trim()) : [];

    const result = await captureText(content, { tags, source: opts.source });

    if (!result.captured) {
      console.log(chalk.yellow(`⚠ Not captured: ${result.reason}`));
      return;
    }

    console.log(chalk.green(`✓ Memory ${result.action}`));
    if (result.node) {
      console.log(`  ID:    ${chalk.cyan(result.node.id)}`);
      console.log(`  Title: ${result.node.title}`);
      if (result.node.tags.length) console.log(`  Tags:  ${result.node.tags.join(', ')}`);
    }
    if (result.reason) {
      console.log(`  ${chalk.dim(result.reason)}`);
    }
  });

export const captureHookCommand = new Command('capture-hook')
  .description('Hook handler for Claude Code auto-capture (receives JSON on stdin)')
  .option('--session <id>', 'Session ID')
  .action(async (opts) => {
    const input = await readStdin();

    if (!input) {
      // Silent exit - hook may be called with empty input
      process.exit(0);
    }

    let data: { conversation?: string; files_changed?: string[]; session_id?: string };
    try {
      data = JSON.parse(input);
    } catch {
      // Not JSON, treat as plain conversation text
      data = { conversation: input };
    }

    const conversation = data.conversation;
    if (!conversation) {
      process.exit(0);
    }

    const result = await captureConversation({
      conversation,
      sessionId: data.session_id || opts.session,
      filesChanged: data.files_changed,
      source: 'claude-code',
    });

    // Output result as JSON for hook system
    console.log(JSON.stringify({
      captured: result.captured,
      action: result.action,
      nodeId: result.node?.id,
      reason: result.reason,
    }));
  });

export const configCommand = new Command('config')
  .description('Manage capture configuration')
  .argument('<action>', 'Action: get, set, or list')
  .argument('[key]', 'Config key (for get/set)')
  .argument('[value]', 'Config value (for set)')
  .action(async (action: string, key?: string, value?: string) => {
    const config = getCaptureConfig();

    if (action === 'list') {
      console.log(chalk.bold('Capture Configuration:'));
      console.log(`  mode:              ${chalk.cyan(config.mode)}`);
      console.log(`  minLength:         ${config.minLength}`);
      console.log(`  excludePatterns:   ${config.excludePatterns.length ? config.excludePatterns.join(', ') : chalk.dim('(none)')}`);
      console.log(`  autoTag:           ${config.autoTag}`);
      console.log(`  linkRelated:       ${config.linkRelated}`);
      console.log(`  similarityThreshold: ${config.similarityThreshold}`);
      console.log(`  mergeThreshold:    ${config.mergeThreshold}`);
      return;
    }

    if (action === 'get') {
      if (!key) {
        console.error(chalk.red('Key required for get'));
        process.exit(1);
      }
      if (!(key in config)) {
        console.error(chalk.red(`Unknown config key: ${key}`));
        process.exit(1);
      }
      const val = config[key as keyof typeof config];
      console.log(Array.isArray(val) ? val.join(', ') : String(val));
      return;
    }

    if (action === 'set') {
      if (!key || value === undefined) {
        console.error(chalk.red('Key and value required for set'));
        process.exit(1);
      }

      let parsedValue: any = value;

      // Parse value based on key type
      if (key === 'mode') {
        if (!VALID_MODES.includes(value as CaptureMode)) {
          console.error(chalk.red(`Invalid mode. Must be one of: ${VALID_MODES.join(', ')}`));
          process.exit(1);
        }
        parsedValue = value;
      } else if (key === 'minLength' || key === 'similarityThreshold' || key === 'mergeThreshold') {
        parsedValue = parseFloat(value);
        if (isNaN(parsedValue)) {
          console.error(chalk.red('Value must be a number'));
          process.exit(1);
        }
      } else if (key === 'autoTag' || key === 'linkRelated') {
        parsedValue = value === 'true' || value === '1';
      } else if (key === 'excludePatterns') {
        parsedValue = value.split(',').map(s => s.trim()).filter(Boolean);
      } else {
        console.error(chalk.red(`Unknown config key: ${key}`));
        process.exit(1);
      }

      setCaptureConfig({ [key]: parsedValue });
      console.log(chalk.green(`✓ Set ${key} = ${JSON.stringify(parsedValue)}`));
      return;
    }

    console.error(chalk.red('Invalid action. Use: get, set, or list'));
    process.exit(1);
  });

async function readStdin(): Promise<string> {
  return new Promise((resolve) => {
    // Check if stdin has data (non-TTY mode)
    if (process.stdin.isTTY) {
      resolve('');
      return;
    }

    let data = '';
    process.stdin.setEncoding('utf8');
    process.stdin.on('data', (chunk) => { data += chunk; });
    process.stdin.on('end', () => { resolve(data.trim()); });

    // Timeout after 100ms if no data
    setTimeout(() => {
      if (!data) resolve('');
    }, 100);
  });
}