# All files / src agents.ts

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     /**
     * Agent Sessions - Programmatic API for AI agents
     *
     * Track agent runs with automatic file watching, git tracking,
     * AI cost logging, and budget enforcement.
     *
     * @example
     * ```typescript
     * import { AgentSession } from 'codesession-cli/agents';
     *
     * const session = new AgentSession('Refactor auth module', {
     *   budget: 5.00,
     *   directory: './src',
     *   git: true,
     * });
     *
     * session.start();
     * // ... agent does work ...
     * const summary = session.end();
     * ```
     */

    import {
      createSession,
      endSession as dbEndSession,
      getSession,
      addAIUsage,
      getFileChanges,
      getCommits,
      getAIUsage,
    } from './db';
    import { initGit, startGitPolling, stopGitPolling, checkForNewCommits, cleanupGit } from './git';
    import { startWatcher, stopWatcher, cleanupWatcher } from './watcher';

    export interface AgentSessionConfig {
      /** Hard budget cap in dollars. Session auto-ends if exceeded. */
      budget?: number;
      /** Directory to watch for file changes. Defaults to cwd. */
      directory?: string;
      /** Enable git commit tracking. Defaults to true. */
      git?: boolean;
      /** Interval (ms) to check for new git commits. Defaults to 5000. */
      gitPollInterval?: number;
      /** Callback when budget is exceeded. Called before session ends. */
      onBudgetExceeded?: (spent: number, budget: number) => void;
      /** Callback when AI usage is logged. */
      onAIUsage?: (cost: number, totalCost: number, model: string) => void;
      /** Callback on each file change. */
      onFileChange?: (filePath: string, changeType: string) => void;
      /** Optional metadata to attach to the session. */
      metadata?: Record<string, any>;
    }

    export interface AgentSessionSummary {
      sessionId: number;
      name: string;
      duration: number;
      filesChanged: number;
      commits: number;
      aiCost: number;
      aiTokens: number;
      budgetRemaining: number | null;
      files: { path: string; type: string; timestamp: string }[];
      commitList: { hash: string; message: string; timestamp: string }[];
      aiUsageBreakdown: { provider: string; model: string; tokens: number; cost: number; timestamp: string }[];
      metadata?: Record<string, any>;
    }

    export class AgentSession {
      private sessionId: number | null = null;
      private name: string;
      private config: AgentSessionConfig;
      private totalCost = 0;
      private totalTokens = 0;
      private started = false;
      private ended = false;

      constructor(name: string, config: AgentSessionConfig = {}) {
        this.name = name;
        this.config = {
          git: true,
          gitPollInterval: 5000,
          ...config,
        };
      }

      /**
       * Start the agent session. Begins file watching and git tracking.
       * @returns The session ID
       */
      start(): number {
        if (this.started) {
          throw new Error(`Session "${this.name}" is already started.`);
        }
        Iif (this.ended) {
          throw new Error(`Session "${this.name}" has already ended. Create a new AgentSession.`);
        }

        const cwd = this.config.directory || process.cwd();

        this.sessionId = createSession({
          name: this.name,
          startTime: new Date().toISOString(),
          workingDirectory: cwd,
          filesChanged: 0,
          commits: 0,
          aiCost: 0,
          aiTokens: 0,
          status: 'active',
        });

        // Start file watcher
        startWatcher(this.sessionId, cwd);

        // Start git polling
        Iif (this.config.git) {
          initGit(this.sessionId, cwd);
          startGitPolling(this.sessionId, this.config.gitPollInterval);
        }

        this.started = true;
        return this.sessionId;
      }

      /**
       * Log AI usage for this session. Automatically checks budget.
       * Cost is optional — auto-calculated from built-in pricing if omitted (requires known model).
       * @returns The remaining budget (null if no budget set)
       * @throws BudgetExceededError if budget is exceeded
       */
      logAI(provider: string, model: string, tokens: number, cost: number, options?: { promptTokens?: number; completionTokens?: number; agentName?: string }): number | null {
        this.assertStarted();

        // Check budget BEFORE writing to database
        const newTotalCost = this.totalCost + cost;
        if (this.config.budget !== undefined && newTotalCost >= this.config.budget) {
          // Write the usage to DB since it's the last allowed call, then end the session
          addAIUsage({
            sessionId: this.sessionId!,
            provider,
            model,
            tokens,
            promptTokens: options?.promptTokens,
            completionTokens: options?.completionTokens,
            cost,
            agentName: options?.agentName,
            timestamp: new Date().toISOString(),
          });

          this.totalCost = newTotalCost;
          this.totalTokens += tokens;

          if (this.config.onBudgetExceeded) {
            this.config.onBudgetExceeded(newTotalCost, this.config.budget);
          }

          // End session before throwing so there's no orphaned active session
          this.end(`Budget reached: $${newTotalCost.toFixed(2)} / $${this.config.budget.toFixed(2)}`);
          throw new BudgetExceededError(newTotalCost, this.config.budget);
        }

        // Budget check passed - safe to write to DB
        addAIUsage({
          sessionId: this.sessionId!,
          provider,
          model,
          tokens,
          promptTokens: options?.promptTokens,
          completionTokens: options?.completionTokens,
          cost,
          agentName: options?.agentName,
          timestamp: new Date().toISOString(),
        });

        this.totalCost = newTotalCost;
        this.totalTokens += tokens;

        // Notify callback
        if (this.config.onAIUsage) {
          this.config.onAIUsage(cost, this.totalCost, model);
        }

        return this.config.budget !== undefined
          ? Math.max(0, this.config.budget - this.totalCost)
          : null;
      }

      /**
       * Check how much budget remains.
       * @returns Remaining budget in dollars, or null if no budget set
       */
      get budgetRemaining(): number | null {
        Iif (this.config.budget === undefined) return null;
        return Math.max(0, this.config.budget - this.totalCost);
      }

      /** Current total cost spent in this session */
      get spent(): number {
        return this.totalCost;
      }

      /** Current total tokens used in this session */
      get tokens(): number {
        return this.totalTokens;
      }

      /** Whether this session is currently active */
      get isActive(): boolean {
        return this.started && !this.ended;
      }

      /** The database session ID (null if not started) */
      get id(): number | null {
        return this.sessionId;
      }

      /**
       * End the agent session and return a full summary.
       */
      end(notes?: string): AgentSessionSummary {
        this.assertStarted();

        // Stop tracking
        stopWatcher(this.sessionId!);
        stopGitPolling(this.sessionId!);
        cleanupGit(this.sessionId!);

        const endTime = new Date().toISOString();
        dbEndSession(this.sessionId!, endTime, notes);

        this.ended = true;

        // Build summary
        const session = getSession(this.sessionId!)!;
        const files = getFileChanges(this.sessionId!);
        const commits = getCommits(this.sessionId!);
        const aiUsage = getAIUsage(this.sessionId!);

        return {
          sessionId: this.sessionId!,
          name: this.name,
          duration: session.duration || 0,
          filesChanged: session.filesChanged,
          commits: session.commits,
          aiCost: session.aiCost,
          aiTokens: session.aiTokens,
          budgetRemaining: this.config.budget !== undefined
            ? Math.max(0, this.config.budget - session.aiCost)
            : null,
          files: files.map((f) => ({
            path: f.filePath,
            type: f.changeType,
            timestamp: f.timestamp,
          })),
          commitList: commits.map((c) => ({
            hash: c.hash,
            message: c.message,
            timestamp: c.timestamp,
          })),
          aiUsageBreakdown: aiUsage.map((a) => ({
            provider: a.provider,
            model: a.model,
            tokens: a.tokens,
            cost: a.cost,
            timestamp: a.timestamp,
          })),
          metadata: this.config.metadata,
        };
      }

      /**
       * Check if an AI call would exceed the budget.
       * Useful for pre-flight checks before making expensive API calls.
       * @returns true if the call would stay within budget
       */
      canAfford(estimatedCost: number): boolean {
        if (this.config.budget === undefined) return true;
        return this.totalCost + estimatedCost <= this.config.budget;
      }

      private assertStarted(): void {
        if (!this.started) {
          throw new Error(`Session "${this.name}" has not been started. Call .start() first.`);
        }
        if (this.ended) {
          throw new Error(`Session "${this.name}" has already ended.`);
        }
      }
    }

    /**
     * Thrown when an agent session exceeds its budget.
     * Catch this to handle budget enforcement gracefully.
     *
     * @example
     * ```typescript
     * try {
     *   session.logAI('openai', 'gpt-4o', 5000, 0.10);
     * } catch (e) {
     *   if (e instanceof BudgetExceededError) {
     *     console.log(`Over budget: spent $${e.spent}, limit $${e.budget}`);
     *   }
     * }
     * ```
     */
    export class BudgetExceededError extends Error {
      public spent: number;
      public budget: number;

      constructor(spent: number, budget: number) {
        super(`Budget exceeded: spent $${spent.toFixed(2)} of $${budget.toFixed(2)} limit`);
        this.name = 'BudgetExceededError';
        this.spent = spent;
        this.budget = budget;
      }
    }

    /**
     * Quick helper to run an agent function within a tracked session.
     * Handles start/end/error automatically.
     *
     * @example
     * ```typescript
     * const summary = await runAgentSession('Fix all linting errors', {
     *   budget: 3.00,
     *   directory: './src',
     * }, async (session) => {
     *   // Your agent logic here
     *   const response = await openai.chat.completions.create({ ... });
     *   session.logAI('openai', 'gpt-4o', response.usage.total_tokens, 0.05);
     * });
     * ```
     */
    export async function runAgentSession(
      name: string,
      config: AgentSessionConfig,
      agentFn: (session: AgentSession) => Promise<void>
    ): Promise<AgentSessionSummary> {
      const session = new AgentSession(name, config);
      session.start();

      try {
        await agentFn(session);
      } catch (error) {
        if (error instanceof BudgetExceededError) {
          // Session already ended by logAI, return summary from DB
          const dbSession = getSession(session.id!);
          Iif (!dbSession) {
            // Shouldn't happen, but guard against it
            return {
              sessionId: session.id!,
              name,
              duration: 0,
              filesChanged: 0,
              commits: 0,
              aiCost: 0,
              aiTokens: 0,
              budgetRemaining: 0,
              files: [],
              commitList: [],
              aiUsageBreakdown: [],
              metadata: config.metadata,
            };
          }
          const files = getFileChanges(session.id!);
          const commits = getCommits(session.id!);
          const aiUsage = getAIUsage(session.id!);

          return {
            sessionId: session.id!,
            name,
            duration: dbSession.duration || 0,
            filesChanged: dbSession.filesChanged,
            commits: dbSession.commits,
            aiCost: dbSession.aiCost,
            aiTokens: dbSession.aiTokens,
            budgetRemaining: 0,
            files: files.map((f) => ({ path: f.filePath, type: f.changeType, timestamp: f.timestamp })),
            commitList: commits.map((c) => ({ hash: c.hash, message: c.message, timestamp: c.timestamp })),
            aiUsageBreakdown: aiUsage.map((a) => ({ provider: a.provider, model: a.model, tokens: a.tokens, cost: a.cost, timestamp: a.timestamp })),
            metadata: config.metadata,
          };
        }
        // For non-budget errors, end session with error note and re-throw
        Eif (session.isActive) {
          session.end(`Error: ${(error as Error).message}`);
        }
        throw error;
      }

      if (session.isActive) {
        return session.end();
      }

      // Session was ended during agentFn (e.g. explicit end call)
      const dbSession = getSession(session.id!)!;
      const files = getFileChanges(session.id!);
      const commitsList = getCommits(session.id!);
      const aiUsage = getAIUsage(session.id!);

      return {
        sessionId: session.id!,
        name,
        duration: dbSession.duration || 0,
        filesChanged: dbSession.filesChanged,
        commits: dbSession.commits,
        aiCost: dbSession.aiCost,
        aiTokens: dbSession.aiTokens,
        budgetRemaining: config.budget !== undefined ? Math.max(0, config.budget - dbSession.aiCost) : null,
        files: files.map((f) => ({ path: f.filePath, type: f.changeType, timestamp: f.timestamp })),
        commitList: commitsList.map((c) => ({ hash: c.hash, message: c.message, timestamp: c.timestamp })),
        aiUsageBreakdown: aiUsage.map((a) => ({ provider: a.provider, model: a.model, tokens: a.tokens, cost: a.cost, timestamp: a.timestamp })),
        metadata: config.metadata,
      };
    }