import { App, Modal, MarkdownView, Notice } from 'obsidian';
import { QueryConfig, TimeRange, EventType } from '../types';
import { buildQuery } from '../core/query-builder';
import { DatabaseManager } from '../core/database';
import { renderTable, toMarkdownTable } from '../viz/table-renderer';
import { HistoryManager } from '../management/history';
import type { SqlAutocomplete, Suggestion } from './autocomplete';

export class QueryModal extends Modal {
  private editorEl!: HTMLTextAreaElement;
  private resultEl!: HTMLElement;
  private modeToggle!: HTMLButtonElement;
  private mode: 'shorthand' | 'sql' = 'shorthand';
  private historyManager?: HistoryManager;
  private initialSql?: string;
  private autocomplete?: SqlAutocomplete;
  private acDropdown: HTMLElement | null = null;
  private acSuggestions: Suggestion[] = [];
  private acIndex = -1;

  constructor(app: App, private db: DatabaseManager, historyManager?: HistoryManager, initialSql?: string, autocomplete?: SqlAutocomplete) {
    super(app);
    this.historyManager = historyManager;
    this.initialSql = initialSql;
    this.autocomplete = autocomplete;
  }

  onOpen(): void {
    const { contentEl } = this;
    contentEl.empty();
    contentEl.addClass('logfire-query-modal');

    contentEl.createEl('h2', { text: 'Logfire Query' });

    // Mode toggle
    const toolbar = contentEl.createDiv({ cls: 'logfire-qm-toolbar' });

    this.modeToggle = toolbar.createEl('button', { text: 'Modus: Shorthand' });
    this.modeToggle.addEventListener('click', () => {
      this.mode = this.mode === 'shorthand' ? 'sql' : 'shorthand';
      this.modeToggle.textContent = this.mode === 'shorthand' ? 'Modus: Shorthand' : 'Modus: SQL';
      this.editorEl.placeholder = this.mode === 'shorthand'
        ? 'events today\nstats this-week group by file\nfiles modified yesterday'
        : 'SELECT * FROM events\nWHERE type = \'file:create\'\nORDER BY timestamp DESC\nLIMIT 50';
    });

    const helpSpan = toolbar.createEl('span', {
      text: 'Ctrl+Enter: Ausf\u00fchren',
      cls: 'logfire-qm-hint',
    });

    // Editor (wrap in relative container for autocomplete dropdown)
    const editorWrap = contentEl.createDiv({ cls: 'logfire-qm-editor-wrap' });

    this.editorEl = editorWrap.createEl('textarea', {
      cls: 'logfire-qm-editor',
      attr: {
        placeholder: 'events today\nstats this-week group by file\nfiles modified yesterday',
        spellcheck: 'false',
      },
    });

    this.editorEl.addEventListener('keydown', (e) => {
      // Autocomplete navigation
      if (this.acDropdown) {
        if (e.key === 'ArrowDown') { e.preventDefault(); this.acNav(1); return; }
        if (e.key === 'ArrowUp') { e.preventDefault(); this.acNav(-1); return; }
        if (e.key === 'Tab' || (e.key === 'Enter' && !e.ctrlKey && !e.metaKey)) {
          if (this.acIndex >= 0) { e.preventDefault(); this.acAccept(); return; }
        }
        if (e.key === 'Escape') { this.acClose(); return; }
      }

      if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
        e.preventDefault();
        this.acClose();
        this.executeQuery();
      }
    });

    this.editorEl.addEventListener('input', () => {
      if (this.mode === 'sql' && this.autocomplete) {
        this.showAutocomplete();
      }
    });

    // Buttons
    const buttonRow = contentEl.createDiv({ cls: 'logfire-qm-buttons' });

    const runBtn = buttonRow.createEl('button', { text: 'Ausf\u00fchren', cls: 'mod-cta' });
    runBtn.addEventListener('click', () => this.executeQuery());

    const copyBtn = buttonRow.createEl('button', { text: 'Als Markdown kopieren' });
    copyBtn.addEventListener('click', () => this.copyAsMarkdown());

    const insertBtn = buttonRow.createEl('button', { text: 'In Notiz einf\u00fcgen' });
    insertBtn.addEventListener('click', () => this.insertInNote());

    const csvBtn = buttonRow.createEl('button', { text: 'CSV Export' });
    csvBtn.addEventListener('click', () => this.exportCsv());

    const jsonBtn = buttonRow.createEl('button', { text: 'JSON Export' });
    jsonBtn.addEventListener('click', () => this.exportJson());

    const clearBtn = buttonRow.createEl('button', { text: 'Leeren' });
    clearBtn.addEventListener('click', () => {
      this.editorEl.value = '';
      this.resultEl.empty();
      this.lastRows = [];
      this.lastKeys = [];
    });

    // Results
    this.resultEl = contentEl.createDiv({ cls: 'logfire-qm-results' });

    // Initial SQL setzen
    if (this.initialSql) {
      this.mode = 'sql';
      this.modeToggle.textContent = 'Modus: SQL';
      this.editorEl.value = this.initialSql;
      this.editorEl.placeholder = 'SELECT * FROM events\nWHERE type = \'file:create\'\nORDER BY timestamp DESC\nLIMIT 50';
    }
  }

  onClose(): void {
    this.acClose();
    this.contentEl.empty();
  }

  private lastRows: Record<string, unknown>[] = [];
  private lastKeys: string[] = [];

  private executeQuery(): void {
    const input = this.editorEl.value.trim();
    if (!input) return;

    this.resultEl.empty();

    const startTime = Date.now();

    try {
      let rows: Record<string, unknown>[];
      let executedSql = input;

      if (this.mode === 'sql') {
        // Raw SQL mode
        const firstWord = input.split(/\s+/)[0].toUpperCase();
        if (firstWord !== 'SELECT' && firstWord !== 'WITH') {
          this.resultEl.createEl('pre', {
            text: 'Nur SELECT- und WITH-Queries sind erlaubt.',
            cls: 'logfire-error',
          });
          return;
        }
        rows = this.db.queryReadOnly(input) as Record<string, unknown>[];
      } else {
        // Shorthand mode
        const config = parseShorthand(input);
        const { sql, params } = buildQuery(config);
        executedSql = sql;
        rows = this.db.queryReadOnly(sql, params) as Record<string, unknown>[];
      }

      const elapsed = Date.now() - startTime;
      this.historyManager?.addEntry(executedSql, elapsed, rows.length);

      this.lastRows = rows;
      this.lastKeys = rows.length > 0 ? Object.keys(rows[0]) : [];

      this.renderResults(rows);
    } catch (err) {
      this.resultEl.createEl('pre', {
        text: `Fehler: ${err instanceof Error ? err.message : String(err)}`,
        cls: 'logfire-error',
      });
    }
  }

  private renderResults(rows: Record<string, unknown>[]): void {
    this.resultEl.empty();

    if (rows.length === 0) {
      this.resultEl.createEl('p', { text: 'Keine Ergebnisse.' });
      return;
    }

    const displayRows = rows.slice(0, 200);
    renderTable(this.resultEl, displayRows);

    if (rows.length > 200) {
      this.resultEl.createEl('p', {
        text: `${rows.length} Ergebnisse, 200 angezeigt.`,
        cls: 'logfire-qm-truncated',
      });
    }
  }

  private copyAsMarkdown(): void {
    if (this.lastRows.length === 0) {
      new Notice('Keine Ergebnisse zum Kopieren.');
      return;
    }
    const md = toMarkdownTable(this.lastKeys, this.lastRows);
    navigator.clipboard.writeText(md);
    new Notice('In Zwischenablage kopiert.');
  }

  private insertInNote(): void {
    if (this.lastRows.length === 0) {
      new Notice('Keine Ergebnisse zum Einf\u00fcgen.');
      return;
    }
    const view = this.app.workspace.getActiveViewOfType(MarkdownView);
    if (!view) {
      new Notice('Kein aktiver Editor zum Einf\u00fcgen.');
      return;
    }
    const md = toMarkdownTable(this.lastKeys, this.lastRows);
    view.editor.replaceSelection(md + '\n');
    this.close();
  }

  // ---------------------------------------------------------------------------
  // CSV / JSON Export
  // ---------------------------------------------------------------------------

  private exportCsv(): void {
    if (this.lastRows.length === 0) {
      new Notice('Keine Ergebnisse zum Exportieren.');
      return;
    }
    const bom = '\uFEFF';
    const header = this.lastKeys.map(csvEscape).join(',');
    const body = this.lastRows.map(row =>
      this.lastKeys.map(k => csvEscape(row[k])).join(',')
    ).join('\n');
    downloadBlob(bom + header + '\n' + body, 'logfire-export.csv', 'text/csv;charset=utf-8');
    new Notice('CSV exportiert.');
  }

  private exportJson(): void {
    if (this.lastRows.length === 0) {
      new Notice('Keine Ergebnisse zum Exportieren.');
      return;
    }
    const json = JSON.stringify(this.lastRows, null, 2);
    downloadBlob(json, 'logfire-export.json', 'application/json');
    new Notice('JSON exportiert.');
  }

  // ---------------------------------------------------------------------------
  // Autocomplete
  // ---------------------------------------------------------------------------

  private showAutocomplete(): void {
    if (!this.autocomplete) return;

    const cursorPos = this.editorEl.selectionStart;
    const suggestions = this.autocomplete.getSuggestions(this.editorEl.value, cursorPos);

    if (suggestions.length === 0) {
      this.acClose();
      return;
    }

    this.acSuggestions = suggestions;
    this.acIndex = -1;

    if (!this.acDropdown) {
      this.acDropdown = this.editorEl.parentElement!.createDiv({ cls: 'logfire-ac-dropdown' });
    }
    this.acDropdown.empty();

    for (let i = 0; i < suggestions.length; i++) {
      const s = suggestions[i];
      const item = this.acDropdown.createDiv({ cls: 'logfire-ac-item' });
      item.createEl('span', { text: s.text, cls: 'logfire-ac-text' });
      item.createEl('span', { text: s.type, cls: `logfire-ac-type logfire-ac-type-${s.type}` });
      if (s.detail) {
        item.createEl('span', { text: s.detail, cls: 'logfire-ac-detail' });
      }
      item.addEventListener('mousedown', (e) => {
        e.preventDefault();
        this.acIndex = i;
        this.acAccept();
      });
    }
  }

  private acNav(dir: number): void {
    if (!this.acDropdown || this.acSuggestions.length === 0) return;
    this.acIndex = Math.max(-1, Math.min(this.acSuggestions.length - 1, this.acIndex + dir));
    const items = this.acDropdown.querySelectorAll('.logfire-ac-item');
    items.forEach((el, i) => el.classList.toggle('is-selected', i === this.acIndex));
  }

  private acAccept(): void {
    if (this.acIndex < 0 || this.acIndex >= this.acSuggestions.length) return;
    const suggestion = this.acSuggestions[this.acIndex];

    const cursorPos = this.editorEl.selectionStart;
    const text = this.editorEl.value;
    const before = text.substring(0, cursorPos);
    const after = text.substring(cursorPos);

    // Letztes Wort ersetzen
    const lastWordMatch = before.match(/[\w._:-]+$/);
    const replaceStart = lastWordMatch ? cursorPos - lastWordMatch[0].length : cursorPos;
    const newBefore = text.substring(0, replaceStart) + suggestion.text;

    this.editorEl.value = newBefore + after;
    this.editorEl.selectionStart = this.editorEl.selectionEnd = newBefore.length;
    this.editorEl.focus();
    this.acClose();
  }

  private acClose(): void {
    this.acDropdown?.remove();
    this.acDropdown = null;
    this.acSuggestions = [];
    this.acIndex = -1;
  }
}

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function csvEscape(value: unknown): string {
  if (value === null || value === undefined) return '';
  const s = String(value);
  if (s.includes(',') || s.includes('"') || s.includes('\n') || s.includes('\r')) {
    return `"${s.replace(/"/g, '""')}"`;
  }
  return s;
}

function downloadBlob(content: string, filename: string, mimeType: string): void {
  const blob = new Blob([content], { type: mimeType });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}

// ---------------------------------------------------------------------------
// Shorthand parser
// ---------------------------------------------------------------------------

function parseShorthand(input: string): QueryConfig {
  const lower = input.toLowerCase().trim();

  let timeRange: TimeRange = { type: 'relative', value: 'today' };
  let eventTypes: EventType[] | undefined;
  let groupBy: QueryConfig['groupBy'];
  let limit = 50;

  const timeRanges: Record<string, TimeRange> = {
    'today': { type: 'relative', value: 'today' },
    'yesterday': { type: 'relative', value: 'yesterday' },
    'this-week': { type: 'relative', value: 'this-week' },
    'this week': { type: 'relative', value: 'this-week' },
    'this-month': { type: 'relative', value: 'this-month' },
    'this month': { type: 'relative', value: 'this-month' },
    'last-7-days': { type: 'relative', value: 'last-7-days' },
    'last 7 days': { type: 'relative', value: 'last-7-days' },
    'last-30-days': { type: 'relative', value: 'last-30-days' },
    'last 30 days': { type: 'relative', value: 'last-30-days' },
  };

  for (const [key, range] of Object.entries(timeRanges)) {
    if (lower.includes(key)) {
      timeRange = range;
      break;
    }
  }

  const groupMatch = lower.match(/group\s+by\s+(\w+)/);
  if (groupMatch) {
    groupBy = groupMatch[1] as QueryConfig['groupBy'];
  }

  const limitMatch = lower.match(/limit\s+(\d+)/);
  if (limitMatch) {
    limit = parseInt(limitMatch[1], 10);
  }

  if (lower.includes('stats')) {
    groupBy = groupBy ?? 'day';
  }
  if (lower.includes('files modified')) {
    eventTypes = ['file:modify'];
  }
  if (lower.includes('files created')) {
    eventTypes = ['file:create'];
  }

  return { timeRange, eventTypes, groupBy, limit };
}