import { ItemView, WorkspaceLeaf, MarkdownRenderer, Notice } from 'obsidian';
import { DatabaseManager } from '../core/database';
import { renderChart, parseChartConfig, ChartConfig } from './chart-renderer';
import { renderTable, renderMetric } from './table-renderer';
import type LogfirePlugin from '../main';

export const DASHBOARD_VIEW_TYPE = 'logfire-dashboard-view';

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------

export interface DashboardWidget {
  id: string;
  type: 'query' | 'chart' | 'stat' | 'text';
  title?: string;
  sql?: string;
  chartConfig?: ChartConfig;
  text?: string;
  refreshInterval?: number;
  position: { row: number; col: number; width: number; height: number };
}

export interface Dashboard {
  id: string;
  name: string;
  widgets: DashboardWidget[];
  columns: number;
  refreshAll?: number;
}

// ---------------------------------------------------------------------------
// Dashboard View
// ---------------------------------------------------------------------------

export class DashboardView extends ItemView {
  private plugin: LogfirePlugin;
  private db: DatabaseManager;
  private currentDashboard: Dashboard | null = null;
  private contentContainer!: HTMLElement;
  private refreshTimers = new Map<string, ReturnType<typeof setInterval>>();
  private globalRefreshTimer: ReturnType<typeof setInterval> | null = null;

  constructor(leaf: WorkspaceLeaf, plugin: LogfirePlugin) {
    super(leaf);
    this.plugin = plugin;
    this.db = plugin.db;
  }

  getViewType(): string {
    return DASHBOARD_VIEW_TYPE;
  }

  getDisplayText(): string {
    return this.currentDashboard?.name ?? 'Dashboard';
  }

  getIcon(): string {
    return 'layout-dashboard';
  }

  async onOpen(): Promise<void> {
    const container = this.containerEl.children[1] as HTMLElement;
    container.empty();
    container.addClass('logfire-dashboard-view');

    const header = container.createDiv({ cls: 'logfire-dash-header' });
    header.createSpan({ cls: 'logfire-dash-title', text: 'Dashboard' });

    const actions = header.createDiv({ cls: 'logfire-dash-actions' });

    const refreshBtn = actions.createEl('button', {
      cls: 'logfire-dash-btn clickable-icon',
      attr: { 'aria-label': 'Refresh' },
      text: '\u21bb',
    });
    refreshBtn.addEventListener('click', () => this.refreshAll());

    this.contentContainer = container.createDiv({ cls: 'logfire-dash-content' });
    this.showEmptyState();
  }

  // ---------------------------------------------------------------------------
  // Public: load a parsed dashboard
  // ---------------------------------------------------------------------------

  loadDashboard(dashboard: Dashboard): void {
    this.clearTimers();
    this.currentDashboard = dashboard;

    const titleEl = this.containerEl.querySelector('.logfire-dash-title');
    if (titleEl) titleEl.textContent = dashboard.name;

    this.render();

    if (dashboard.refreshAll && dashboard.refreshAll > 0) {
      this.globalRefreshTimer = setInterval(() => this.refreshAll(), dashboard.refreshAll * 1000);
    }
  }

  // ---------------------------------------------------------------------------
  // Rendering
  // ---------------------------------------------------------------------------

  private render(): void {
    this.contentContainer.empty();
    if (!this.currentDashboard || this.currentDashboard.widgets.length === 0) {
      this.showEmptyState();
      return;
    }

    const grid = this.contentContainer.createDiv({ cls: 'logfire-dash-grid' });
    grid.style.gridTemplateColumns = `repeat(${this.currentDashboard.columns}, 1fr)`;

    for (const widget of this.currentDashboard.widgets) {
      this.renderWidget(grid, widget);
    }
  }

  private showEmptyState(): void {
    this.contentContainer.empty();
    this.contentContainer.createDiv({
      cls: 'logfire-empty',
      text: 'No dashboard loaded.',
    });
  }

  private renderWidget(container: HTMLElement, widget: DashboardWidget): void {
    const el = container.createDiv({ cls: 'logfire-dash-widget' });
    el.style.gridColumn = `${widget.position.col + 1} / span ${widget.position.width}`;
    el.style.gridRow = `${widget.position.row + 1} / span ${widget.position.height}`;

    if (widget.title) {
      el.createDiv({ cls: 'logfire-dash-widget-title', text: widget.title });
    }

    const content = el.createDiv({ cls: 'logfire-dash-widget-content' });
    this.renderWidgetContent(content, widget);

    if (widget.refreshInterval && widget.refreshInterval > 0) {
      const timer = setInterval(() => {
        if (!document.contains(el)) {
          clearInterval(timer);
          this.refreshTimers.delete(widget.id);
          return;
        }
        content.empty();
        this.renderWidgetContent(content, widget);
      }, widget.refreshInterval * 1000);
      this.refreshTimers.set(widget.id, timer);
    }
  }

  private renderWidgetContent(container: HTMLElement, widget: DashboardWidget): void {
    try {
      switch (widget.type) {
        case 'query':
          this.renderQueryWidget(container, widget);
          break;
        case 'chart':
          this.renderChartWidget(container, widget);
          break;
        case 'stat':
          this.renderStatWidget(container, widget);
          break;
        case 'text':
          this.renderTextWidget(container, widget);
          break;
      }
    } catch (err) {
      container.createDiv({
        cls: 'logfire-error',
        text: `Error: ${err instanceof Error ? err.message : String(err)}`,
      });
    }
  }

  private renderQueryWidget(container: HTMLElement, widget: DashboardWidget): void {
    if (!widget.sql) {
      container.createDiv({ cls: 'logfire-empty', text: 'No query configured.' });
      return;
    }
    const rows = this.db.queryReadOnly(widget.sql) as Record<string, unknown>[];
    if (rows.length === 0) {
      container.createDiv({ cls: 'logfire-empty', text: 'No results.' });
      return;
    }
    renderTable(container, rows);
  }

  private renderChartWidget(container: HTMLElement, widget: DashboardWidget): void {
    if (!widget.sql || !widget.chartConfig) {
      container.createDiv({ cls: 'logfire-empty', text: 'No chart configured.' });
      return;
    }
    const rows = this.db.queryReadOnly(widget.sql) as Record<string, unknown>[];
    renderChart(container, rows, widget.chartConfig);
  }

  private renderStatWidget(container: HTMLElement, widget: DashboardWidget): void {
    if (!widget.sql) {
      container.createDiv({ cls: 'logfire-empty', text: 'No query configured.' });
      return;
    }
    const rows = this.db.queryReadOnly(widget.sql) as Record<string, unknown>[];
    renderMetric(container, rows);
  }

  private renderTextWidget(container: HTMLElement, widget: DashboardWidget): void {
    if (widget.text) {
      MarkdownRenderer.render(this.plugin.app, widget.text, container, '', this.plugin);
    }
  }

  // ---------------------------------------------------------------------------
  // Refresh & cleanup
  // ---------------------------------------------------------------------------

  private refreshAll(): void {
    this.render();
  }

  private clearTimers(): void {
    for (const timer of this.refreshTimers.values()) clearInterval(timer);
    this.refreshTimers.clear();
    if (this.globalRefreshTimer) {
      clearInterval(this.globalRefreshTimer);
      this.globalRefreshTimer = null;
    }
  }

  async onClose(): Promise<void> {
    this.clearTimers();
  }
}

// ---------------------------------------------------------------------------
// Code-block parser: ```logfire-dashboard
// ---------------------------------------------------------------------------

export function parseDashboardBlock(source: string): Dashboard | null {
  const lines = source.split('\n');
  const dashboard: Dashboard = {
    id: `dash-${Date.now()}`,
    name: 'Dashboard',
    widgets: [],
    columns: 12,
  };

  let currentWidget: Partial<DashboardWidget> | null = null;
  let widgetLines: string[] = [];

  for (const line of lines) {
    // Dashboard metadata
    const nameMatch = line.match(/^name:\s*(.+)$/i);
    if (nameMatch) { dashboard.name = nameMatch[1].trim(); continue; }

    const colsMatch = line.match(/^columns:\s*(\d+)$/i);
    if (colsMatch) { dashboard.columns = parseInt(colsMatch[1]); continue; }

    const refreshMatch = line.match(/^refresh:\s*(\d+)$/i);
    if (refreshMatch) { dashboard.refreshAll = parseInt(refreshMatch[1]); continue; }

    // Widget header
    const widgetMatch = line.match(
      /^\[widget:(\w+)\s+row:(\d+)\s+col:(\d+)\s+width:(\d+)\s+height:(\d+)\]$/i,
    );
    if (widgetMatch) {
      if (currentWidget) finalizeWidget(currentWidget, widgetLines, dashboard.widgets);
      currentWidget = {
        id: `w-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
        type: widgetMatch[1] as DashboardWidget['type'],
        position: {
          row: parseInt(widgetMatch[2]),
          col: parseInt(widgetMatch[3]),
          width: parseInt(widgetMatch[4]),
          height: parseInt(widgetMatch[5]),
        },
      };
      widgetLines = [];
      continue;
    }

    if (currentWidget) widgetLines.push(line);
  }

  if (currentWidget) finalizeWidget(currentWidget, widgetLines, dashboard.widgets);
  return dashboard.widgets.length > 0 ? dashboard : null;
}

function finalizeWidget(
  widget: Partial<DashboardWidget>,
  lines: string[],
  widgets: DashboardWidget[],
): void {
  const content = lines.join('\n').trim();

  // Title directive
  const titleMatch = content.match(/^--\s*title:\s*(.+)$/m);
  if (titleMatch) widget.title = titleMatch[1].trim();

  // Refresh directive
  const refreshMatch = content.match(/^--\s*refresh:\s*(\d+)$/m);
  if (refreshMatch) widget.refreshInterval = parseInt(refreshMatch[1]);

  // Chart config
  const chartConfig = parseChartConfig(content);
  if (chartConfig) widget.chartConfig = chartConfig;

  // Extract SQL (lines that are not directives)
  const sqlLines = content
    .split('\n')
    .filter(l => !l.match(/^--\s*(title|refresh|chart):/i));
  const sql = sqlLines.join('\n').trim();
  if (sql) widget.sql = sql;

  // Text widget: use full content
  if (widget.type === 'text') {
    widget.text = content;
    widget.sql = undefined;
  }

  if (widget.id && widget.position) {
    widgets.push(widget as DashboardWidget);
  }
}