const path = require('node:path');
const fs = require('fs-extra');
const { BaseIdeSetup } = require('./_base-ide');
const chalk = require('chalk');
const { getProjectRoot, getSourcePath, getModulePath } = require('../../../lib/project-root');
const { UnifiedInstaller, NamingStyle, TemplateType } = require('./shared/unified-installer');
const {
  loadModuleInjectionConfig,
  shouldApplyInjection,
  filterAgentInstructions,
  resolveSubagentFiles,
} = require('./shared/module-injections');
const { getAgentsFromBmad, getAgentsFromDir } = require('./shared/bmad-artifacts');
const { customAgentColonName } = require('./shared/path-utils');
const prompts = require('../../../lib/prompts');

/**
 * Claude Code IDE setup handler
 *
 * Uses UnifiedInstaller for standard artifact installation,
 * plus Claude-specific subagent injection handling.
 */
console.log(`[DEBUG CLAUDE-CODE] Module loaded!`);
class ClaudeCodeSetup extends BaseIdeSetup {
  constructor() {
    super('claude-code', 'Claude Code', true);
    this.configDir = '.claude';
    this.commandsDir = 'commands';
    this.agentsDir = 'agents';
  }

  /**
   * Prompt for subagent installation location
   */
  async promptInstallLocation() {
    return prompts.select({
      message: 'Where would you like to install Claude Code subagents?',
      choices: [
        { name: 'Project level (.claude/agents/)', value: 'project' },
        { name: 'User level (~/.claude/agents/)', value: 'user' },
      ],
      default: 'project',
    });
  }

  /**
   * Cleanup old BMAD installation before reinstalling
   */
  async cleanup(projectDir) {
    const commandsDir = path.join(projectDir, this.configDir, this.commandsDir);

    // Remove ANY bmad folder or files at any level
    const bmadPath = path.join(commandsDir, 'bmad');
    if (await fs.pathExists(bmadPath)) {
      await fs.remove(bmadPath);
      console.log(chalk.dim(`  Removed old bmad folder from ${this.name}`));
    }

    // Also remove any bmad* files at root level
    if (await fs.pathExists(commandsDir)) {
      const entries = await fs.readdir(commandsDir);
      let removedCount = 0;
      for (const entry of entries) {
        if (entry.startsWith('bmad')) {
          await fs.remove(path.join(commandsDir, entry));
          removedCount++;
        }
      }
    }
  }

  /**
   * Setup Claude Code IDE configuration
   */
  async setup(projectDir, bmadDir, options = {}) {
    console.log(`[DEBUG CLAUDE-CODE] setup called! projectDir=${projectDir}`);
    this.projectDir = projectDir;

    console.log(chalk.cyan(`Setting up ${this.name}...`));

    await this.cleanup(projectDir);

    const claudeDir = path.join(projectDir, this.configDir);
    const commandsDir = path.join(claudeDir, this.commandsDir);
    await this.ensureDir(commandsDir);

    // Use the unified installer for standard artifacts
    const installer = new UnifiedInstaller(this.bmadFolderName);
    console.log(`[DEBUG CLAUDE-CODE] About to call installer.install, targetDir=${commandsDir}`);
    const counts = await installer.install(
      projectDir,
      bmadDir,
      {
        targetDir: commandsDir,
        namingStyle: NamingStyle.FLAT_COLON,
        templateType: TemplateType.CLAUDE,
      },
      options.selectedModules || [],
    );
    console.log(`[DEBUG CLAUDE-CODE] installer.install done, counts=`, counts);

    // Process Claude Code specific injections for installed modules
    if (options.preCollectedConfig && options.preCollectedConfig._alreadyConfigured) {
      await this.processModuleInjectionsWithConfig(projectDir, bmadDir, options, {});
    } else if (options.preCollectedConfig) {
      await this.processModuleInjectionsWithConfig(projectDir, bmadDir, options, options.preCollectedConfig);
    } else {
      await this.processModuleInjections(projectDir, bmadDir, options);
    }

    console.log(chalk.green(`✓ ${this.name} configured:`));
    console.log(chalk.dim(`  - ${counts.agents} agents installed`));
    if (counts.workflows > 0) {
      console.log(chalk.dim(`  - ${counts.workflows} workflow commands generated`));
    }
    if (counts.tasks + counts.tools > 0) {
      console.log(
        chalk.dim(`  - ${counts.tasks + counts.tools} task/tool commands generated (${counts.tasks} tasks, ${counts.tools} tools)`),
      );
    }
    console.log(chalk.dim(`  - Commands directory: ${path.relative(projectDir, commandsDir)}`));

    return {
      success: true,
      agents: counts.agents,
    };
  }

  /**
   * Read and process file content
   */
  async readAndProcess(filePath, metadata) {
    const content = await fs.readFile(filePath, 'utf8');
    return this.processContent(content, metadata);
  }

  /**
   * Override processContent to keep {project-root} placeholder
   */
  processContent(content, metadata = {}) {
    return super.processContent(content, metadata);
  }

  /**
   * Get agents from source modules (not installed location)
   */
  async getAgentsFromSource(sourceDir, selectedModules) {
    const agents = [];

    const corePath = getModulePath('core');
    if (await fs.pathExists(path.join(corePath, 'agents'))) {
      const coreAgents = await getAgentsFromDir(path.join(corePath, 'agents'), 'core');
      agents.push(...coreAgents);
    }

    for (const moduleName of selectedModules) {
      const modulePath = path.join(sourceDir, moduleName);
      const agentsPath = path.join(modulePath, 'agents');

      if (await fs.pathExists(agentsPath)) {
        const moduleAgents = await getAgentsFromDir(agentsPath, moduleName);
        agents.push(...moduleAgents);
      }
    }

    return agents;
  }

  /**
   * Process module injections with pre-collected configuration
   */
  async processModuleInjectionsWithConfig(projectDir, bmadDir, options, preCollectedConfig) {
    const modules = options.selectedModules || [];
    const { subagentChoices, installLocation } = preCollectedConfig;

    await this.processModuleInjectionsInternal({
      projectDir,
      modules,
      handler: 'claude-code',
      subagentChoices,
      installLocation,
      interactive: false,
    });
  }

  /**
   * Process Claude Code specific injections for installed modules
   */
  async processModuleInjections(projectDir, bmadDir, options) {
    const modules = options.selectedModules || [];
    let subagentChoices = null;
    let installLocation = null;

    const { subagentChoices: updatedChoices, installLocation: updatedLocation } = await this.processModuleInjectionsInternal({
      projectDir,
      modules,
      handler: 'claude-code',
      subagentChoices,
      installLocation,
      interactive: true,
    });

    if (updatedChoices) {
      subagentChoices = updatedChoices;
    }
    if (updatedLocation) {
      installLocation = updatedLocation;
    }
  }

  async processModuleInjectionsInternal({ projectDir, modules, handler, subagentChoices, installLocation, interactive = false }) {
    console.log(`[DEBUG CLAUDE-CODE] processModuleInjectionsInternal called! modules=${modules.join(',')}`);
    let choices = subagentChoices;
    let location = installLocation;

    for (const moduleName of modules) {
      const configData = await loadModuleInjectionConfig(handler, moduleName);

      if (!configData) {
        continue;
      }

      const { config, handlerBaseDir } = configData;

      if (interactive) {
        console.log(chalk.cyan(`\nConfiguring ${moduleName} ${handler.replace('-', ' ')} features...`));
      }

      if (interactive && config.subagents && !choices) {
        // choices = await this.promptSubagentInstallation(config.subagents);
        // if (choices.install !== 'none') {
        //   location = await this.promptInstallLocation();
        // }
      }

      if (config.injections && choices && choices.install !== 'none') {
        for (const injection of config.injections) {
          if (shouldApplyInjection(injection, choices)) {
            await this.injectContent(projectDir, injection, choices);
          }
        }
      }

      if (config.subagents && choices && choices.install !== 'none') {
        await this.copySelectedSubagents(projectDir, handlerBaseDir, config.subagents, choices, location || 'project');
      }
    }

    return { subagentChoices: choices, installLocation: location };
  }

  /**
   * Prompt user for subagent installation preferences
   */
  async promptSubagentInstallation(subagentConfig) {
    const install = await prompts.select({
      message: 'Would you like to install Claude Code subagents for enhanced functionality?',
      choices: [
        { name: 'Yes, install all subagents', value: 'all' },
        { name: 'Yes, let me choose specific subagents', value: 'selective' },
        { name: 'No, skip subagent installation', value: 'none' },
      ],
      default: 'all',
    });

    if (install === 'selective') {
      const subagentInfo = {
        'market-researcher.md': 'Market research and competitive analysis',
        'requirements-analyst.md': 'Requirements extraction and validation',
        'technical-evaluator.md': 'Technology stack evaluation',
        'epic-optimizer.md': 'Epic and story breakdown optimization',
        'document-reviewer.md': 'Document quality review',
      };

      const selected = await prompts.multiselect({
        message: `Select subagents to install ${chalk.dim('(↑/↓ navigates multiselect, SPACE toggles, A to toggles All, ENTER confirm)')}:`,
        options: subagentConfig.files.map((file) => ({
          label: `${file.replace('.md', '')} - ${subagentInfo[file] || 'Specialized assistant'}`,
          value: file,
        })),
        initialValues: subagentConfig.files,
      });

      return { install: 'selective', selected };
    }

    return { install };
  }

  /**
   * Inject content at specified point in file
   */
  async injectContent(projectDir, injection, subagentChoices = null) {
    const targetPath = path.join(projectDir, injection.file);

    if (await this.exists(targetPath)) {
      let content = await fs.readFile(targetPath, 'utf8');
      const marker = `<!-- IDE-INJECT-POINT: ${injection.point} -->`;

      if (content.includes(marker)) {
        let injectionContent = injection.content;

        if (subagentChoices && subagentChoices.install === 'selective' && injection.point === 'pm-agent-instructions') {
          injectionContent = filterAgentInstructions(injection.content, subagentChoices.selected);
        }

        content = content.replace(marker, injectionContent);
        await fs.writeFile(targetPath, content);
        console.log(chalk.dim(`    Injected: ${injection.point} → ${injection.file}`));
      }
    }
  }

  /**
   * Copy selected subagents to appropriate Claude agents directory
   */
  async copySelectedSubagents(projectDir, handlerBaseDir, subagentConfig, choices, location) {
    const os = require('node:os');

    let targetDir;
    if (location === 'user') {
      targetDir = path.join(os.homedir(), '.claude', 'agents');
      console.log(chalk.dim(`  Installing subagents globally to: ~/.claude/agents/`));
    } else {
      targetDir = path.join(projectDir, '.claude', 'agents');
      console.log(chalk.dim(`  Installing subagents to project: .claude/agents/`));
    }

    await this.ensureDir(targetDir);

    const resolvedFiles = await resolveSubagentFiles(handlerBaseDir, subagentConfig, choices);

    let copiedCount = 0;
    for (const resolved of resolvedFiles) {
      try {
        const sourcePath = resolved.absolutePath;

        const subFolder = path.dirname(resolved.relativePath);
        let targetPath;
        if (subFolder && subFolder !== '.') {
          const targetSubDir = path.join(targetDir, subFolder);
          await this.ensureDir(targetSubDir);
          targetPath = path.join(targetSubDir, path.basename(resolved.file));
        } else {
          targetPath = path.join(targetDir, path.basename(resolved.file));
        }

        await fs.copyFile(sourcePath, targetPath);
        console.log(chalk.green(`    ✓ Installed: ${subFolder === '.' ? '' : `${subFolder}/`}${path.basename(resolved.file, '.md')}`));
        copiedCount++;
      } catch (error) {
        console.log(chalk.yellow(`    ⚠ Error copying ${resolved.file}: ${error.message}`));
      }
    }

    if (copiedCount > 0) {
      console.log(chalk.dim(`  Total subagents installed: ${copiedCount}`));
    }
  }

  /**
   * Install a custom agent launcher for Claude Code
   */
  async installCustomAgentLauncher(projectDir, agentName, agentPath, metadata) {
    const commandsDir = path.join(projectDir, this.configDir, this.commandsDir);

    if (!(await this.exists(path.join(projectDir, this.configDir)))) {
      return null;
    }

    await this.ensureDir(commandsDir);

    const launcherContent = `---
name: '${agentName}'
description: '${agentName} agent'
---

You must fully embody this agent's persona and follow all activation instructions exactly as specified. NEVER break character until given an exit command.

<agent-activation CRITICAL="TRUE">
1. LOAD the FULL agent file from @${agentPath}
2. READ its entire contents - this contains the complete agent persona, menu, and instructions
3. FOLLOW every step in the <activation> section precisely
4. DISPLAY the welcome/greeting as instructed
5. PRESENT the numbered menu
6. WAIT for user input before proceeding
</agent-activation>
`;

    const launcherName = customAgentColonName(agentName);
    const launcherPath = path.join(commandsDir, launcherName);
    await this.writeFile(launcherPath, launcherContent);

    return {
      path: launcherPath,
      command: `/${launcherName.replace('.md', '')}`,
    };
  }
}

module.exports = { ClaudeCodeSetup };