import { AccountBalanceService } from '@ghostfolio/api/app/account-balance/account-balance.service';
import { AccountService } from '@ghostfolio/api/app/account/account.service';
import { WatchlistService } from '@ghostfolio/api/app/endpoints/watchlist/watchlist.service';
import { OrderService } from '@ghostfolio/api/app/order/order.service';
import { PortfolioService } from '@ghostfolio/api/app/portfolio/portfolio.service';
import { RedisCacheService } from '@ghostfolio/api/app/redis-cache/redis-cache.service';
import { UserService } from '@ghostfolio/api/app/user/user.service';
import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
import { PortfolioSnapshotService } from '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service';
import { TagService } from '@ghostfolio/api/services/tag/tag.service';

import { createAnthropic } from '@ai-sdk/anthropic';
import { Injectable, Logger } from '@nestjs/common';
import {
  ToolLoopAgent,
  stepCountIs,
  type ModelMessage,
  type PrepareStepFunction,
  type UIMessage
} from 'ai';
import { randomUUID } from 'node:crypto';
import { join } from 'node:path';

import { AgentMetricsService } from './agent-metrics.service';
import { validateModelId } from './models';
import { createPrepareStep, loadSkills } from './prepare-step';
import { createAccountManageTool } from './tools/account-manage.tool';
import { createActivityManageTool } from './tools/activity-manage.tool';
import { createHoldingsLookupTool } from './tools/holdings.tool';
import { createMarketDataTool } from './tools/market-data.tool';
import { createPortfolioPerformanceTool } from './tools/performance.tool';
import { createPortfolioAnalysisTool } from './tools/portfolio.tool';
import { createSymbolSearchTool } from './tools/symbol-search.tool';
import { createTagManageTool } from './tools/tag-manage.tool';
import { createTransactionHistoryTool } from './tools/transactions.tool';
import { createWatchlistManageTool } from './tools/watchlist-manage.tool';
import {
  checkHallucination,
  computeConfidence,
  validateOutput
} from './verification';

const BASE_INSTRUCTIONS = `Be extremely concise. Sacrifice grammar for the sake of concision.

You are a financial analysis assistant powered by Ghostfolio. You help users understand their investment portfolio through data-driven insights.

RULES:
- You can read AND write portfolio data. You can create/update/delete accounts, transactions, watchlist items, and tags.
- Never provide investment advice. Always include "This is not financial advice" when making forward-looking statements.
- Only reference data returned by your tools. Never fabricate numbers or holdings.
- Do not narrate or announce tool calls. Execute tools directly, then respond with results.
- If a tool call fails, tell the user honestly rather than guessing.
- Be concise and data-focused. Use tables and bullet points for clarity.
- When presenting monetary values, use the user's base currency.
- When presenting percentages, round to 2 decimal places.

FORMATTING:
- Never use emojis.
- Structure data responses with a clear markdown heading (e.g., "## Portfolio Performance (YTD)").
- Present multi-item or comparative data in markdown tables. Use concise column headers.
- After data tables, include one sentence of insight or context.
- Use **bold** for key metrics mentioned inline. Never use ALL CAPS for emphasis.
- Format currency with commas and two decimals (e.g., $48,210.45).
- Round percentages to two decimal places. Prefix positive returns with +.
- Keep responses focused -- no filler, no disclaimers unless discussing forward-looking statements.

RICH FORMATTING (use these custom fenced blocks when the data fits):

1. Allocation breakdowns: use a 2-column markdown table with percentage values.
   | Asset Class | Allocation |
   |---|---|
   | Equities | 65% |

2. Key metric summaries (2-4 values): use \`\`\`metrics block. One "Label: Value: Delta" per line. Use "--" if no delta.
   \`\`\`metrics
   Net Worth: $85k: +4.2%
   Div. Yield: 3.1%: --
   \`\`\`

3. Follow-up suggestions: ALWAYS end responses with a \`\`\`suggestions block (exactly 2 suggestions, one per line).
   \`\`\`suggestions
   Show my dividend history
   Compare YTD vs last year
   \`\`\`

4. Sparklines for trends: \`\`\`sparkline with title and comma-separated values.
5. Charts when user asks to visualize: \`\`\`chart-area or \`\`\`chart-bar with "Label: Value" per line.`;

@Injectable()
export class AgentService {
  private readonly logger = new Logger(AgentService.name);
  private readonly skills: ReturnType<typeof loadSkills>;

  public constructor(
    private readonly accountBalanceService: AccountBalanceService,
    private readonly accountService: AccountService,
    private readonly agentMetricsService: AgentMetricsService,
    private readonly dataProviderService: DataProviderService,
    private readonly orderService: OrderService,
    private readonly portfolioService: PortfolioService,
    private readonly portfolioSnapshotService: PortfolioSnapshotService,
    private readonly redisCacheService: RedisCacheService,
    private readonly tagService: TagService,
    private readonly userService: UserService,
    private readonly watchlistService: WatchlistService
  ) {
    this.skills = loadSkills(join(__dirname, 'skills'));
  }

  public async chat({
    approvedActions,
    messages,
    model,
    toolHistory,
    userId
  }: {
    approvedActions?: string[];
    messages: ModelMessage[] | UIMessage[];
    model?: string;
    toolHistory?: string[];
    userId: string;
  }) {
    const requestId = randomUUID();
    const startTime = Date.now();
    const modelId = validateModelId(model);

    this.logger.log(
      JSON.stringify({
        event: 'chat_start',
        requestId,
        userId,
        modelId,
        messageCount: messages.length
      })
    );

    const anthropic = createAnthropic();

    const tools = this.buildTools(userId, approvedActions);
    const prepareStep = createPrepareStep(
      this.skills,
      BASE_INSTRUCTIONS,
      toolHistory
    );

    const agent = new ToolLoopAgent({
      model: anthropic(modelId),
      instructions: BASE_INSTRUCTIONS,
      tools,
      prepareStep: prepareStep as unknown as PrepareStepFunction<typeof tools>,
      stopWhen: stepCountIs(10),
      onStepFinish: ({ toolCalls, usage, finishReason, stepNumber }) => {
        const toolNames = toolCalls.map((tc) => tc.toolName);
        this.logger.log(
          JSON.stringify({
            event: 'step_finish',
            requestId,
            userId,
            step: stepNumber,
            finishReason,
            toolsCalled: toolNames.length > 0 ? toolNames : undefined,
            tokens: usage
          })
        );
      },
      onFinish: ({ steps, usage, text }) => {
        const latencyMs = Date.now() - startTime;
        const allTools = steps.flatMap((s) =>
          s.toolCalls.map((tc) => tc.toolName)
        );
        const uniqueTools = [...new Set(allTools)];

        // Run verification
        const toolResults = steps.flatMap((s) =>
          s.toolResults.map((tr: any) => ({
            toolName: tr.toolName as string,
            result: tr.output
          }))
        );
        const toolErrors = steps.flatMap((s) =>
          s.toolResults.filter((tr: any) => {
            const out = tr.output;
            return out && typeof out === 'object' && 'error' in out;
          })
        );

        const validation = validateOutput({
          text,
          toolCalls: allTools
        });
        const hallucination = checkHallucination({
          text,
          toolResults
        });
        const confidence = computeConfidence({
          toolCallCount: allTools.length,
          toolErrorCount: toolErrors.length,
          stepCount: steps.length,
          maxSteps: 10,
          validation,
          hallucination
        });

        this.logger.log(
          JSON.stringify({
            event: 'verification',
            requestId,
            userId,
            confidence: confidence.score,
            validationIssues: validation.issues,
            hallucinationIssues: hallucination.issues
          })
        );

        this.logger.log(
          JSON.stringify({
            event: 'chat_complete',
            requestId,
            userId,
            latencyMs,
            totalSteps: steps.length,
            totalTokens: usage,
            toolsUsed: uniqueTools
          })
        );

        this.agentMetricsService.record({
          requestId,
          userId,
          modelId,
          latencyMs,
          totalSteps: steps.length,
          toolsUsed: uniqueTools,
          promptTokens:
            (usage as any).promptTokens ?? (usage as any).inputTokens ?? 0,
          completionTokens:
            (usage as any).completionTokens ?? (usage as any).outputTokens ?? 0,
          totalTokens: usage.totalTokens ?? 0,
          timestamp: Date.now(),
          verificationScore: confidence.score,
          verificationResult: {
            confidence: confidence.breakdown,
            validation: {
              valid: validation.valid,
              score: validation.score,
              issues: validation.issues
            },
            hallucination: {
              clean: hallucination.clean,
              score: hallucination.score,
              issues: hallucination.issues
            }
          }
        });
      }
    });

    return { agent, requestId };
  }

  private buildTools(userId: string, approvedActions?: string[]) {
    return {
      account_manage: createAccountManageTool({
        accountService: this.accountService,
        approvedActions,
        portfolioSnapshotService: this.portfolioSnapshotService,
        redisCacheService: this.redisCacheService,
        userService: this.userService,
        userId
      }),
      activity_manage: createActivityManageTool({
        accountService: this.accountService,
        approvedActions,
        dataProviderService: this.dataProviderService,
        orderService: this.orderService,
        portfolioSnapshotService: this.portfolioSnapshotService,
        redisCacheService: this.redisCacheService,
        userService: this.userService,
        userId
      }),
      portfolio_analysis: createPortfolioAnalysisTool({
        portfolioService: this.portfolioService,
        userId
      }),
      portfolio_performance: createPortfolioPerformanceTool({
        portfolioService: this.portfolioService,
        userId
      }),
      holdings_lookup: createHoldingsLookupTool({
        portfolioService: this.portfolioService,
        userId
      }),
      market_data: createMarketDataTool({
        dataProviderService: this.dataProviderService
      }),
      symbol_search: createSymbolSearchTool({
        dataProviderService: this.dataProviderService,
        userService: this.userService,
        userId
      }),
      tag_manage: createTagManageTool({
        tagService: this.tagService,
        userId
      }),
      transaction_history: createTransactionHistoryTool({
        accountBalanceService: this.accountBalanceService,
        accountService: this.accountService,
        orderService: this.orderService,
        userService: this.userService,
        userId
      }),
      watchlist_manage: createWatchlistManageTool({
        watchlistService: this.watchlistService,
        userId
      })
    };
  }
}