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import { ContextTemplate } from '../core-entities';
import { CreateSessionInputDto } from './dto/session-input.dto';
import { ContextGenerationService } from '../context-generation/context-generation.service';
import { ApplicationStateService } from '../application-state/application-state.service';
import { ContextSnippetsService } from '../context-snippets/context-snippets.service';
import { countTokens } from 'gpt-tokenizer';
import { CustomVariablesService } from '../custom-variables/custom-variables.service';
interface ContextDefinition {
files?: string[];
folders?: string[];
command_outputs?: string[];
}
@Injectable()
export class SessionInputContextService {
private readonly logger = new Logger(SessionInputContextService.name);
constructor(
private readonly contextGenerationService: ContextGenerationService,
private readonly applicationStateService: ApplicationStateService,
private readonly contextSnippetsService: ContextSnippetsService,
private readonly customVariablesService: CustomVariablesService,
) {}
private async resolveContextSnippets(
prompt: string,
): Promise<{ resolvedContent: string; cleanedPrompt: string }> {
// Regex to find !handle that is a whole word (preceded by space/start, followed by space/end)
const snippetRegex = /(^|\s)\!(\w[-\w]*)(?=\s|$)/g;
const matches = [...prompt.matchAll(snippetRegex)];
if (matches.length === 0) {
return { resolvedContent: '', cleanedPrompt: prompt };
}
const snippetHandles = matches.map((match) => match[2]);
this.logger.log(
`Found context snippet handles: ${snippetHandles.join(', ')}`,
);
const resolvedContents: string[] = [];
for (const handle of snippetHandles) {
try {
const snippet = await this.contextSnippetsService.findByHandle(handle);
const content = await this.contextGenerationService.render(
snippet.template_content,
{}, // Pass an empty data object to make helpers available
);
resolvedContents.push(content);
} catch (error) {
this.logger.error(
`Failed to resolve context snippet "!${handle}": ${error.message}`,
);
resolvedContents.push(`Error resolving !${handle}: ${error.message}`);
}
}
// Remove only the exclamation mark, preserving the handle text in the prompt.
const cleanedPrompt = prompt
.replace(/(^|\s)\!(\w[-\w]*)(?=\s|$)/g, '$1$2')
.replace(/\s{2,}/g, ' ')
.trim();
return {
resolvedContent: resolvedContents.join('\n\n'),
cleanedPrompt,
};
}
async generateContext(
dto: CreateSessionInputDto,
contextTemplate: ContextTemplate | null,
previousActionsSummary?: string,
): Promise<string> {
const { resolvedContent: context_snippets_content, cleanedPrompt } =
await this.resolveContextSnippets(dto.user_prompt);
dto.user_prompt = cleanedPrompt; // Update DTO with cleaned prompt for template rendering
this.logger.log(
`Generating context. Template: ${
contextTemplate?.template_name || 'None'
}. Ad-hoc: ${!!dto.ad_hoc_context_definition}. Snippets: ${
context_snippets_content.length > 0 ? 'Yes' : 'No'
}.`,
);
const defaultTemplate = `<%~ it.context_snippets_content %>
<%~ it.adhoc_files_content %>
<%~ it.adhoc_folders_content %>
<%~ it.adhoc_command_outputs_content %>
<%~ it.user_input %>`;
const templateContent =
contextTemplate?.template_content ?? defaultTemplate;
Iif (templateContent.trim() === '') {
this.logger.warn(
'Context template is empty. Using only the user prompt.',
);
return dto.user_prompt;
}
const adHocData: {
adhoc_files_content: string;
adhoc_folders_content: string;
adhoc_command_outputs_content: string;
} = {
adhoc_files_content: '',
adhoc_folders_content: '',
adhoc_command_outputs_content: '',
};
let templateContextDef: ContextDefinition = {};
Iif (contextTemplate?.context_definition) {
try {
templateContextDef = JSON.parse(contextTemplate.context_definition);
} catch (e) {
this.logger.warn(
`Could not parse context_definition from template ID ${contextTemplate.id}`,
);
}
}
let adhocContextDef: ContextDefinition = {};
if (dto.ad_hoc_context_definition) {
try {
adhocContextDef = JSON.parse(dto.ad_hoc_context_definition);
} catch (e) {
this.logger.warn(
`Could not parse ad_hoc_context_definition as JSON: ${dto.ad_hoc_context_definition}`,
);
}
}
const mergedFiles = [
...(templateContextDef.files || []),
...(adhocContextDef.files || []),
];
const uniqueFiles = [...new Set(mergedFiles)];
const mergedFolders = [
...(templateContextDef.folders || []),
...(adhocContextDef.folders || []),
];
const uniqueFolders = [...new Set(mergedFolders)];
if (uniqueFiles.length > 0) {
const fileContents = await Promise.all(
uniqueFiles.map((filePath: string) =>
this.contextGenerationService.secureReadFile(filePath),
),
);
adHocData.adhoc_files_content = fileContents.join('\n\n');
}
if (uniqueFolders.length > 0) {
const folderContexts = await Promise.all(
uniqueFolders.map(async (folderPath: string) => {
const tree =
await this.contextGenerationService.secureTree(folderPath);
const header = `// Tree for: ${folderPath}\n\`\`\`\n${tree}\n\`\`\``;
const filesInFolder = await this.contextGenerationService.secureGlob(
`${folderPath}/**/*`,
);
const fileContents = await Promise.all(
filesInFolder.map((filePath: string) =>
this.contextGenerationService.secureReadFile(filePath),
),
);
return [header, ...fileContents].join('\n\n');
}),
);
adHocData.adhoc_folders_content = folderContexts.join('\n\n---\n\n');
}
Iif (
adhocContextDef.command_outputs &&
adhocContextDef.command_outputs.length > 0
) {
adHocData.adhoc_command_outputs_content = adhocContextDef.command_outputs
.map((output) => `// Command Output:\n\`\`\`\n${output}\n\`\`\``)
.join('\n\n');
}
const enabledVariables = await this.customVariablesService.findAllEnabled();
const variableMap = enabledVariables.reduce((acc, curr) => {
acc[curr.key] = curr.value;
return acc;
}, {});
const data = {
ad_hoc_context_definition: dto.ad_hoc_context_definition || null,
user_input: dto.user_prompt,
user_prev_action: previousActionsSummary || '',
context_snippets_content,
...adHocData,
VAR: variableMap,
};
try {
const generatedString = await this.contextGenerationService.render(
templateContent,
data,
);
const tokenCount = countTokens(generatedString);
const TOKEN_LIMIT =
await this.applicationStateService.getContextTokenLimit();
if (tokenCount > TOKEN_LIMIT) {
const errorMessage = `The context you requested is too large (${tokenCount} tokens, limit is ${TOKEN_LIMIT}). Please ask for a smaller context.`;
this.logger.warn(
`Generated context exceeds token limit. Size: ${tokenCount} tokens. Limit: ${TOKEN_LIMIT} tokens.`,
);
return errorMessage;
}
if (!templateContent.includes('it.user_input')) {
this.logger.warn(
"Template does not explicitly use 'it.user_input'. Appending user prompt to the end.",
);
return generatedString.trim()
? `${generatedString}\n\n${dto.user_prompt}`
: dto.user_prompt;
}
this.logger.log(
`Generated context string of length ${generatedString.length} (${tokenCount} tokens)`,
);
return generatedString;
} catch (error) {
this.logger.error(
`Context generation failed: ${error.message}`,
error.stack,
);
throw new BadRequestException(
`Failed to generate context from template: ${error.message}`,
);
}
}
}
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