/**
 * 可视化更新模块
 * 负责处理分析结果的可视化更新逻辑
 */

import * as d3 from 'd3';
import type { AnalyzeResponse, FrontendAnalyzeResult, FrontendToken } from '../api/GLTR_API';
import type { GLTR_Text_Box } from '../vis/GLTR_Text_Box';
import type { HighlightController } from '../controllers/highlightController';
import type { TextInputController } from '../controllers/textInputController';
import type { Histogram } from '../vis/Histogram';
import type { ScatterPlot } from '../vis/ScatterPlot';
import type { AppStateManager } from './appStateManager';
import {
    cloneFrontendToken,
    mergeTokensForRendering,
    createRawSnapshot
} from './tokenUtils';
import type { ColbertToken } from './semanticOverlayUtils';
import { decodeColbertTokens, computeTokenSimilarities, cosToColorScale, queryEmbeddingFromColbertTokens } from './semanticOverlayUtils';
import {
    validateTokenConsistency,
    validateTokenProbabilities,
    validateTokenPredictions
} from './dataValidation';
import {
    calculateTextStats,
    type TextStats
} from './textStatistics';
import { getTokenSurprisalHistogramConfig, getSurprisalProgressConfig, getSemanticCosHistogramConfig } from "./visualizationConfigs";
import { showAlertDialog } from '../ui/dialog';
import { tr } from '../lang/i18n-lite';
import { getSemanticAnalysisEnabled } from './semanticAnalysisManager';

/**
 * 可视化更新依赖
 */
export interface VisualizationDependencies {
    lmf: GLTR_Text_Box;
    highlightController: HighlightController;
    textInputController: TextInputController;
    stats_frac: Histogram;
    stats_semantic_cos: Histogram;
    stats_surprisal_progress: ScatterPlot;
    appStateManager: AppStateManager;
    surprisalColorScale: d3.ScaleSequential<string>;
    /** 语义索引模型名更新回调（用于 UI 显示 index model: xxx） */
    onSemanticIndexModelUpdate?: (model: string | undefined) => void;
}

/**
 * 当前数据状态
 */
export interface CurrentDataState {
    currentData: AnalyzeResponse | null;
    rawApiResponse: AnalyzeResponse | null;
    currentSurprisals: number[] | null;
    currentTokenAvg: number | null;
    currentTokenP90: number | null;
    currentTotalSurprisal: number | null;
}

/**
 * 可视化更新管理器
 */
export class VisualizationUpdater {
    private deps: VisualizationDependencies;
    private currentState: CurrentDataState;

    constructor(deps: VisualizationDependencies) {
        this.deps = deps;
        this.currentState = {
            currentData: null,
            rawApiResponse: null,
            currentSurprisals: null,
            currentTokenAvg: null,
            currentTokenP90: null,
            currentTotalSurprisal: null
        };
    }

    /**
     * 获取当前数据状态
     */
    getCurrentState(): Readonly<CurrentDataState> {
        return { ...this.currentState };
    }

    /**
     * 获取当前原始API响应
     */
    getRawApiResponse(): AnalyzeResponse | null {
        return this.currentState.rawApiResponse;
    }

    /**
     * 获取当前数据
     */
    getCurrentData(): AnalyzeResponse | null {
        return this.currentState.currentData;
    }

    /**
     * 获取当前 surprisal 数据
     */
    getCurrentSurprisals(): number[] | null {
        return this.currentState.currentSurprisals;
    }

    /**
     * 更新文本指标（包括模型显示）
     */
    private updateTextMetrics(stats: TextStats | null, modelName?: string | null | undefined): void {
        this.deps.textInputController.updateTextMetrics(stats, modelName);
    }

    /**
     * 清除高亮
     */
    private clearHighlights(): void {
        this.deps.highlightController.clearHighlights();
    }

    /**
     * 重新渲染直方图（内部方法）
     */
    private rerenderHistogramsInternal(): void {
        const currentSurprisals = this.currentState.currentSurprisals;
        const currentTokenAvg = this.currentState.currentTokenAvg;
        const currentTokenP90 = this.currentState.currentTokenP90;
        
        if (currentSurprisals) {
            // Token surprisal histogram: 使用 19 个台阶，对应区间：[0,1), [1,2), ..., [17,18), [18,∞)
            const tokenHistogramConfig = getTokenSurprisalHistogramConfig();
            this.deps.stats_frac.update({
                ...tokenHistogramConfig,
                data: currentSurprisals,
                colorScale: this.deps.surprisalColorScale,
                averageValue: currentTokenAvg ?? undefined,
                p90Value: currentTokenP90 ?? undefined,
            });

            // 更新主视图中 token surprisal histogram 的标题文本
            const titleElement = document.getElementById('token_histogram_title');
            if (titleElement) {
                titleElement.textContent = tokenHistogramConfig.label;
            }
        }
        if (currentSurprisals && currentSurprisals.length > 0) {
            const surprisalProgressConfig = getSurprisalProgressConfig();
            this.deps.stats_surprisal_progress.update({
                ...surprisalProgressConfig,
                data: currentSurprisals,
            });

            // 更新主视图中 surprisal progress 的标题文本
            const surprisalProgressTitleElement = document.getElementById('surprisal_progress_title');
            if (surprisalProgressTitleElement && surprisalProgressConfig.label) {
                surprisalProgressTitleElement.textContent = surprisalProgressConfig.label;
            }
        }

        // 语义分析模式：若有 cos 数据则渲染 cos 直方图，颜色按 match score = max(cos, 0) 取值，小于 0 的 bin 用 0 的颜色
        const tokensWithCos = (this.currentState.currentData?.result as FrontendAnalyzeResult & { semanticColbertTokens?: Array<{ cos?: number }> })?.semanticColbertTokens;
        const cosValues = tokensWithCos?.map((t) => t.cos).filter((c): c is number => typeof c === 'number');
        const cosHistogramItem = document.getElementById('semantic_cos_histogram_item');
        if (cosValues && cosValues.length > 0) {
            const cosConfig = getSemanticCosHistogramConfig();
            const cosAvg = cosValues.reduce((a, b) => a + b, 0) / cosValues.length;
            this.deps.stats_semantic_cos.update({
                ...cosConfig,
                data: cosValues,
                colorScale: cosToColorScale,
                averageValue: cosAvg,
            });
            const cosTitleEl = document.getElementById('semantic_cos_histogram_title');
            if (cosTitleEl) cosTitleEl.textContent = cosConfig.label;
            if (cosHistogramItem) cosHistogramItem.style.display = '';
        } else if (cosHistogramItem) {
            cosHistogramItem.style.display = 'none';
        }
    }

    /**
     * 重新渲染直方图（公开方法，供外部调用，如主题切换时）
     */
    public rerenderHistograms(): void {
        this.rerenderHistogramsInternal();
    }

    /**
     * 根据语义分析配置同步 UI 状态（查询输入框、文本渲染模式等）
     * 界面完全由配置决定，不因数据有无而改变
     */
    public syncSemanticUiFromConfig(): void {
        const enabled = getSemanticAnalysisEnabled();
        const el = document.getElementById('semantic_analysis_section');
        if (el) el.style.display = enabled ? '' : 'none';
        this.deps.lmf.updateOptions({ semanticAnalysisMode: enabled }, false);
        // 语义分析配置影响 Upload/Save 的 dataReadyForSave 条件，需始终更新按钮状态
        this.deps.appStateManager.updateButtonStates();
    }

    /**
     * 更新可视化（核心方法）
     * 
     * @param data 分析响应数据
     * @param disableAnimation 是否禁用动画
     * @param options 选项
     */
    updateFromRequest(
        data: AnalyzeResponse,
        disableAnimation: boolean = false,
        options: { enableSave?: boolean } = {}
    ): void {
        const { enableSave = true } = options;
        const dataHasSemantic = !!(data?.result as { semantic_index?: unknown })?.semantic_index;
        const hasSemanticAnalysis = getSemanticAnalysisEnabled() && dataHasSemantic;

        const abortDueToInvalidResponse = (message: string) => {
            console.error(message);
            showAlertDialog(tr('Error'), message);
            this.deps.appStateManager.updateState({ hasValidData: false, hasSemanticIndex: false });
            this.deps.onSemanticIndexModelUpdate?.(undefined);
            this.syncSemanticUiFromConfig();
        };

        try {
            // 只有 Analyze 触发时开启动画，其它情况保持关闭（默认已关闭）
            if (!disableAnimation) {
                this.deps.lmf.updateOptions({ enableRenderAnimation: true }, false);
            }
            // 语义分析模式由配置决定，不因数据有无而改变
            this.deps.lmf.updateOptions({ semanticAnalysisMode: getSemanticAnalysisEnabled() }, false);

            d3.select('#all_result').style('opacity', 1).style('display', null);
            this.deps.appStateManager.setIsAnalyzing(false);
            this.deps.appStateManager.setGlobalLoading(false);

            // 隐藏文本区域的加载状态（会在lmf.update中自动隐藏，但这里提前隐藏以提升体验）
            this.deps.lmf.hideLoading();

            // 验证数据结构
            if (!data || !data.result) {
                console.error('Invalid data structure:', data);
                throw new Error('Invalid API response structure');
            }

            const result = data.result;

            // 确保所有必需的字段都存在且类型正确
            if (!Array.isArray(result.bpe_strings) || result.bpe_strings.length === 0) {
                abortDueToInvalidResponse(tr('Returned JSON missing valid bpe_strings array, processing cancelled.'));
                return;
            }
            const predTopkError = validateTokenPredictions(result.bpe_strings as Array<{ pred_topk?: [string, number][] }>);
            if (predTopkError) {
                abortDueToInvalidResponse(predTopkError);
                return;
            }
            const probabilityError = validateTokenProbabilities(result.bpe_strings as Array<{ real_topk?: [number, number] }>);
            if (probabilityError) {
                abortDueToInvalidResponse(probabilityError);
                return;
            }

            const safeText = data.request.text;
            const validationError = validateTokenConsistency(result.bpe_strings, safeText, { allowOverlap: true });
            if (validationError) {
                abortDueToInvalidResponse(validationError);
                return;
            }

            const rawSnapshot = createRawSnapshot(data);
            const originalTokens = result.bpe_strings.map((token) => cloneFrontendToken(token as FrontendToken));
            const { mergedTokens, originalToMergedMap } = mergeTokensForRendering(originalTokens, safeText);
            const mergedValidationError = validateTokenConsistency(mergedTokens, safeText);
            if (mergedValidationError) {
                abortDueToInvalidResponse(mergedValidationError);
                return;
            }

            const si = (result as { semantic_index?: { colbert_tokens?: ColbertToken[] } }).semantic_index;
            const semanticColbertTokens = hasSemanticAnalysis && si?.colbert_tokens
                ? decodeColbertTokens(si.colbert_tokens)
                : undefined;

            const enhancedResult: FrontendAnalyzeResult & { semanticColbertTokens?: ColbertToken[] } = {
                ...result,
                originalTokens,
                mergedTokens,
                originalToMergedMap,
                bpe_strings: mergedTokens,
                originalText: safeText,
                ...(semanticColbertTokens && { semanticColbertTokens }),
            };
            data.result = enhancedResult;

            // 保存当前数据（通过校验后）
            this.currentState.currentData = data;
            this.currentState.rawApiResponse = rawSnapshot;
            // 更新高亮控制器的当前数据
            this.deps.highlightController.updateCurrentData({ result: enhancedResult });

            // 设置原始文本，用于从offset提取token文本
            enhancedResult.originalText = safeText;

            // 清除之前的高亮状态（新的分析数据）
            this.deps.lmf.clearHighlight();

            // 只调用 lmf.update，不调用任何统计更新
            this.deps.lmf.update(enhancedResult);

            const textStats = calculateTextStats(enhancedResult, safeText);

            // 保存当前surprisal数据，用于主题切换时重新渲染
            this.currentState.currentSurprisals = textStats.tokenSurprisals;
            this.currentState.currentTokenAvg = textStats.tokenAverage;
            this.currentState.currentTokenP90 = textStats.tokenP90;
            this.currentState.currentTotalSurprisal = textStats.totalSurprisal;

            // 更新文本指标和模型显示（从分析结果中获取实际使用的模型）
            const resultModel = data.result.model;
            this.updateTextMetrics(textStats, resultModel);

            // Analyze 渲染完成后关闭动画，避免拖拽等二次渲染再次播放
            if (!disableAnimation) {
                // 延迟关闭，确保动画有足够时间完成
                // 动画时长估算：初始延迟100ms + 批次处理时间（根据token数量）
                const tokenCount = enhancedResult.bpe_strings.length;
                const estimatedAnimationTime = 100 + Math.ceil(tokenCount / 50) * 100;
                const delayTime = Math.max(2000, estimatedAnimationTime + 500);

                setTimeout(() => {
                    this.deps.lmf.updateOptions({ enableRenderAnimation: false }, false);
                }, delayTime);
            }
        } catch (error) {
            console.error('Error updating visualization:', error);
            this.deps.appStateManager.setIsAnalyzing(false);
            this.deps.appStateManager.setGlobalLoading(false);
            this.deps.appStateManager.updateState({ hasValidData: false, hasSemanticIndex: false });
            this.deps.onSemanticIndexModelUpdate?.(undefined);
            this.syncSemanticUiFromConfig();
            showAlertDialog(tr('Error'), 'Error rendering visualization. Check console for details.');
            return;
        }

        // 清除之前的选中状态
        this.clearHighlights();

        // 重新渲染直方图
        this.rerenderHistogramsInternal();

        // 数据成功处理，标记为有效数据（TextMetrics 显示，Analyze 变灰）
        this.deps.appStateManager.updateState({ hasValidData: true, hasSemanticIndex: dataHasSemantic });

        this.deps.onSemanticIndexModelUpdate?.(dataHasSemantic ? (data?.result as { semantic_index?: { model?: string } })?.semantic_index?.model : undefined);
        this.syncSemanticUiFromConfig();
    }

    /**
     * 语义索引响应：解码 colbert_tokens 并合并到当前数据
     */
    public handleSemanticIndexResponse(semanticIndex: { model?: string; colbert_tokens?: ColbertToken[] }): void {
        const data = this.currentState.currentData;
        const raw = this.currentState.rawApiResponse;
        if (!data?.result || !raw) return;

        const colbertTokens = semanticIndex?.colbert_tokens;
        if (!colbertTokens?.length) return;

        const decodedTokens = decodeColbertTokens(colbertTokens);
        const result = data.result as FrontendAnalyzeResult & { semanticColbertTokens?: ColbertToken[] };
        const enhancedResult: FrontendAnalyzeResult & { semanticColbertTokens?: ColbertToken[] } = {
            ...result,
            semanticColbertTokens: decodedTokens,
        };

        this.currentState.currentData = { ...data, result: enhancedResult };
        this.currentState.rawApiResponse = {
            ...raw,
            result: { ...raw.result, semantic_index: semanticIndex } as typeof raw.result,
        };
        this.deps.highlightController.updateCurrentData({ result: enhancedResult });
        this.deps.lmf.updateOptions({ enableRenderAnimation: false }, false);
        this.deps.lmf.update(enhancedResult);
        this.rerenderHistogramsInternal();
        this.deps.appStateManager.updateState({ hasSemanticIndex: true });
        this.deps.onSemanticIndexModelUpdate?.(semanticIndex.model);
        this.syncSemanticUiFromConfig();
    }

    /**
     * 语义查询响应：从 semantic_index 的 colbert_tokens 计算 query embedding
     * （Qwen3-Embedding 用 last-token pool，其他用平均），再计算每个 token 的 cos 相似度并更新染色
     */
    public handleSemanticQueryResponse(semanticIndex: { model?: string; colbert_tokens?: ColbertToken[] }): void {
        const data = this.currentState.currentData;
        if (!data?.result) return;

        const result = data.result as FrontendAnalyzeResult & { semanticColbertTokens?: ColbertToken[] };
        const tokens = result.semanticColbertTokens;
        if (!tokens?.length || !tokens.some((t) => t.embeddingVec)) return;

        const queryTokens = semanticIndex?.colbert_tokens;
        const queryVec = queryTokens ? queryEmbeddingFromColbertTokens(queryTokens) : null;
        if (!queryVec) return;

        const { cos, matchScore } = computeTokenSimilarities(tokens, queryVec);
        const tokensWithSimilarities: Array<ColbertToken & { cos: number; matchScore: number }> = tokens.map((t, i) => ({
            ...t,
            cos: cos[i],
            matchScore: matchScore[i],
        }));

        const enhancedResult: FrontendAnalyzeResult & { semanticColbertTokens?: typeof tokensWithSimilarities } = {
            ...result,
            semanticColbertTokens: tokensWithSimilarities,
        };

        this.currentState.currentData = { ...data, result: enhancedResult };
        this.deps.highlightController.updateCurrentData({ result: enhancedResult });
        this.deps.lmf.updateOptions({ enableRenderAnimation: false }, false);
        this.deps.lmf.update(enhancedResult);

        // 更新 cos 直方图
        this.rerenderHistogramsInternal();
    }
}