export const registerConfigEntityRoutes = (app, dependencies) => {
  const {
    resolveProjectDirectory,
    resolveOptionalProjectDirectory,
    refreshOpenCodeAfterConfigChange,
    clientReloadDelayMs,
    getAgentSources,
    getAgentConfig,
    createAgent,
    updateAgent,
    deleteAgent,
    getCommandSources,
    createCommand,
    updateCommand,
    deleteCommand,
    listMcpConfigs,
    getMcpConfig,
    createMcpConfig,
    updateMcpConfig,
    deleteMcpConfig,
    listSnippets,
    getSnippet,
    createSnippet,
    updateSnippet,
    deleteSnippet,
    expandSnippets,
  } = dependencies;

  // Build the response for a config mutation based on whether OpenCode actually
  // reloaded the change. When connected to an external OpenCode server that
  // OpenChamber cannot restart, the change is persisted to disk but the running
  // server will not serve it until the user restarts that server. We must not
  // report a clean "reloading" success in that case, otherwise the UI silently
  // reverts the edit to the stale value on the next refresh.
  const buildConfigMutationResponse = (refreshResult, { liveMessage, manualRestartMessage }) => {
    if (refreshResult && refreshResult.external) {
      return {
        success: true,
        requiresReload: false,
        requiresManualRestart: true,
        message: manualRestartMessage,
      };
    }

    return {
      success: true,
      requiresReload: true,
      message: liveMessage,
      reloadDelayMs: clientReloadDelayMs,
    };
  };

  const completeMcpMutation = async (res, action, name, applyChange) => {
    applyChange();

    try {
      await refreshOpenCodeAfterConfigChange(`mcp ${action}`);
      return res.json({
        success: true,
        requiresReload: true,
        message: `MCP server "${name}" ${action}d. Reloading interface…`,
        reloadDelayMs: clientReloadDelayMs,
      });
    } catch (error) {
      console.error(`[API:MCP ${action}] Reload failed after config write:`, error);
      return res.json({
        success: true,
        requiresReload: false,
        reloadFailed: true,
        message: `MCP server "${name}" ${action}d, but OpenCode reload failed.`,
        warning: error.message || 'OpenCode reload failed after the MCP configuration changed',
      });
    }
  };

  app.get('/api/config/agents/:name', async (req, res) => {
    try {
      const agentName = req.params.name;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }
      const sources = getAgentSources(agentName, directory);

      const scope = sources.md.exists
        ? sources.md.scope
        : (sources.json.exists ? sources.json.scope : null);

      res.json({
        name: agentName,
        sources: sources,
        scope,
        isBuiltIn: !sources.md.exists && !sources.json.exists
      });
    } catch (error) {
      console.error('Failed to get agent sources:', error);
      res.status(500).json({ error: 'Failed to get agent configuration metadata' });
    }
  });

  app.get('/api/config/agents/:name/config', async (req, res) => {
    try {
      const agentName = req.params.name;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      const configInfo = getAgentConfig(agentName, directory);
      res.json(configInfo);
    } catch (error) {
      console.error('Failed to get agent config:', error);
      res.status(500).json({ error: 'Failed to get agent configuration' });
    }
  });

  app.post('/api/config/agents/:name', async (req, res) => {
    try {
      const agentName = req.params.name;
      const { scope, ...config } = req.body;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      console.log('[Server] Creating agent:', agentName);
      console.log('[Server] Config received:', JSON.stringify(config, null, 2));
      console.log('[Server] Scope:', scope, 'Working directory:', directory);

      createAgent(agentName, config, directory, scope);
      const refreshResult = await refreshOpenCodeAfterConfigChange('agent creation', {
        agentName
      });

      res.json(buildConfigMutationResponse(refreshResult, {
        liveMessage: `Agent ${agentName} created successfully. Reloading interface…`,
        manualRestartMessage: `Agent ${agentName} saved. Restart your connected OpenCode server to apply the change.`,
      }));
    } catch (error) {
      console.error('Failed to create agent:', error);
      res.status(500).json({ error: error.message || 'Failed to create agent' });
    }
  });

  app.patch('/api/config/agents/:name', async (req, res) => {
    try {
      const agentName = req.params.name;
      const updates = req.body;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      console.log(`[Server] Updating agent: ${agentName}`);
      console.log('[Server] Updates:', JSON.stringify(updates, null, 2));
      console.log('[Server] Working directory:', directory);

      updateAgent(agentName, updates, directory);
      const refreshResult = await refreshOpenCodeAfterConfigChange('agent update');

      console.log(`[Server] Agent ${agentName} updated successfully`);

      res.json(buildConfigMutationResponse(refreshResult, {
        liveMessage: `Agent ${agentName} updated successfully. Reloading interface…`,
        manualRestartMessage: `Agent ${agentName} saved. Restart your connected OpenCode server to apply the change.`,
      }));
    } catch (error) {
      console.error('[Server] Failed to update agent:', error);
      console.error('[Server] Error stack:', error.stack);
      res.status(500).json({ error: error.message || 'Failed to update agent' });
    }
  });

  app.delete('/api/config/agents/:name', async (req, res) => {
    try {
      const agentName = req.params.name;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      const scope = req.body?.scope;
      deleteAgent(agentName, directory, scope);
      const refreshResult = await refreshOpenCodeAfterConfigChange('agent deletion');

      res.json(buildConfigMutationResponse(refreshResult, {
        liveMessage: `Agent ${agentName} deleted successfully. Reloading interface…`,
        manualRestartMessage: `Agent ${agentName} deleted. Restart your connected OpenCode server to apply the change.`,
      }));
    } catch (error) {
      console.error('Failed to delete agent:', error);
      res.status(500).json({ error: error.message || 'Failed to delete agent' });
    }
  });

  app.get('/api/config/mcp', async (req, res) => {
    try {
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      const configs = listMcpConfigs(directory);
      res.json(configs);
    } catch (error) {
      console.error('[API:GET /api/config/mcp] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to list MCP configs' });
    }
  });

  app.get('/api/config/mcp/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      const config = getMcpConfig(name, directory);
      if (!config) {
        return res.status(404).json({ error: `MCP server "${name}" not found` });
      }
      res.json(config);
    } catch (error) {
      console.error('[API:GET /api/config/mcp/:name] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to get MCP config' });
    }
  });

  app.post('/api/config/mcp/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { scope, ...config } = req.body || {};
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      console.log(`[API:POST /api/config/mcp] Creating MCP server: ${name}`);

      await completeMcpMutation(res, 'create', name, () => {
        createMcpConfig(name, config, directory, scope);
      });
    } catch (error) {
      console.error('[API:POST /api/config/mcp/:name] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to create MCP server' });
    }
  });

  app.patch('/api/config/mcp/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const updates = req.body;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      console.log(`[API:PATCH /api/config/mcp] Updating MCP server: ${name}`);

      await completeMcpMutation(res, 'update', name, () => {
        updateMcpConfig(name, updates, directory);
      });
    } catch (error) {
      console.error('[API:PATCH /api/config/mcp/:name] Failed:', error);
      if (error?.message === `MCP server "${req.params.name}" not found`) {
        return res.status(404).json({ error: error.message });
      }
      res.status(500).json({ error: error.message || 'Failed to update MCP server' });
    }
  });

  app.delete('/api/config/mcp/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      console.log(`[API:DELETE /api/config/mcp] Deleting MCP server: ${name}`);

      await completeMcpMutation(res, 'delete', name, () => {
        deleteMcpConfig(name, directory);
      });
    } catch (error) {
      console.error('[API:DELETE /api/config/mcp/:name] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to delete MCP server' });
    }
  });

  app.get('/api/config/commands/:name', async (req, res) => {
    try {
      const commandName = req.params.name;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }
      const sources = getCommandSources(commandName, directory);

      const scope = sources.md.exists
        ? sources.md.scope
        : (sources.json.exists ? sources.json.scope : null);

      res.json({
        name: commandName,
        sources: sources,
        scope,
        isBuiltIn: !sources.md.exists && !sources.json.exists
      });
    } catch (error) {
      console.error('Failed to get command sources:', error);
      res.status(500).json({ error: 'Failed to get command configuration metadata' });
    }
  });

  app.post('/api/config/commands/:name', async (req, res) => {
    try {
      const commandName = req.params.name;
      const { scope, ...config } = req.body;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      console.log('[Server] Creating command:', commandName);
      console.log('[Server] Config received:', JSON.stringify(config, null, 2));
      console.log('[Server] Scope:', scope, 'Working directory:', directory);

      createCommand(commandName, config, directory, scope);
      await refreshOpenCodeAfterConfigChange('command creation', {
        commandName
      });

      res.json({
        success: true,
        requiresReload: true,
        message: `Command ${commandName} created successfully. Reloading interface…`,
        reloadDelayMs: clientReloadDelayMs,
      });
    } catch (error) {
      console.error('Failed to create command:', error);
      res.status(500).json({ error: error.message || 'Failed to create command' });
    }
  });

  app.patch('/api/config/commands/:name', async (req, res) => {
    try {
      const commandName = req.params.name;
      const updates = req.body;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      console.log(`[Server] Updating command: ${commandName}`);
      console.log('[Server] Updates:', JSON.stringify(updates, null, 2));
      console.log('[Server] Working directory:', directory);

      updateCommand(commandName, updates, directory);
      await refreshOpenCodeAfterConfigChange('command update');

      console.log(`[Server] Command ${commandName} updated successfully`);

      res.json({
        success: true,
        requiresReload: true,
        message: `Command ${commandName} updated successfully. Reloading interface…`,
        reloadDelayMs: clientReloadDelayMs,
      });
    } catch (error) {
      console.error('[Server] Failed to update command:', error);
      console.error('[Server] Error stack:', error.stack);
      res.status(500).json({ error: error.message || 'Failed to update command' });
    }
  });

  app.delete('/api/config/commands/:name', async (req, res) => {
    try {
      const commandName = req.params.name;
      const { directory, error } = await resolveProjectDirectory(req);
      if (!directory) {
        return res.status(400).json({ error });
      }

      deleteCommand(commandName, directory);
      await refreshOpenCodeAfterConfigChange('command deletion');

      res.json({
        success: true,
        requiresReload: true,
        message: `Command ${commandName} deleted successfully. Reloading interface…`,
        reloadDelayMs: clientReloadDelayMs,
      });
    } catch (error) {
      console.error('Failed to delete command:', error);
      res.status(500).json({ error: error.message || 'Failed to delete command' });
    }
  });

  app.get('/api/config/snippets', async (req, res) => {
    try {
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      res.json(listSnippets(directory));
    } catch (error) {
      console.error('[API:GET /api/config/snippets] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to list snippets' });
    }
  });

  app.post('/api/config/snippets/expand', async (req, res) => {
    try {
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      res.json({ text: expandSnippets(req.body?.text ?? '', directory) });
    } catch (error) {
      console.error('[API:POST /api/config/snippets/expand] Failed:', error);
      res.status(500).json({ error: error.message || 'Failed to expand snippets' });
    }
  });

  app.get('/api/config/snippets/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      const snippet = getSnippet(name, directory);
      if (!snippet) {
        return res.status(404).json({ error: `Snippet "${name}" not found` });
      }
      res.json(snippet);
    } catch (error) {
      console.error('[API:GET /api/config/snippets/:name] Failed:', error);
      if (error.message?.includes('Snippet name')) {
        return res.status(400).json({ error: error.message });
      }
      res.status(500).json({ error: error.message || 'Failed to get snippet' });
    }
  });

  app.post('/api/config/snippets/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      const snippet = createSnippet(name, req.body || {}, directory, req.body?.scope || 'global');
      res.json({ success: true, snippet });
    } catch (error) {
      console.error('[API:POST /api/config/snippets/:name] Failed:', error);
      if (error.message?.includes('already exists')) {
        return res.status(409).json({ error: error.message });
      }
      if (error.message?.includes('Snippet name') || error.message?.includes('Project directory')) {
        return res.status(400).json({ error: error.message });
      }
      res.status(500).json({ error: error.message || 'Failed to create snippet' });
    }
  });

  app.patch('/api/config/snippets/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      res.json({ success: true, snippet: updateSnippet(name, req.body || {}, directory) });
    } catch (error) {
      console.error('[API:PATCH /api/config/snippets/:name] Failed:', error);
      if (error.message?.includes('not found')) {
        return res.status(404).json({ error: error.message });
      }
      if (error.message?.includes('Snippet name')) {
        return res.status(400).json({ error: error.message });
      }
      res.status(500).json({ error: error.message || 'Failed to update snippet' });
    }
  });

  app.delete('/api/config/snippets/:name', async (req, res) => {
    try {
      const name = req.params.name;
      const { directory, error } = await resolveOptionalProjectDirectory(req);
      if (error) {
        return res.status(400).json({ error });
      }
      deleteSnippet(name, directory);
      res.json({ success: true });
    } catch (error) {
      console.error('[API:DELETE /api/config/snippets/:name] Failed:', error);
      if (error.message?.includes('not found')) {
        return res.status(404).json({ error: error.message });
      }
      if (error.message?.includes('Snippet name')) {
        return res.status(400).json({ error: error.message });
      }
      res.status(500).json({ error: error.message || 'Failed to delete snippet' });
    }
  });
};