/* ObsiGate — Autocomplete intelligent
 * Partagé entre éditeur Forge (textarea) et CodeMirror.
 * Détecte le contexte autour du curseur et suggère des complétions.
 *
 * Contexte supporté : mermaid, code fence, frontmatter, markdown, wikilink, table, texte libre.
 *
 * API :
 *   suggest(text, cursorPos) → { context, items: [{label, detail, insert, from, to}] }
 *   CompletionSource pour CodeMirror : codeMirrorCompletionSource(context)
 */

// ── Suggestion Data ──────────────────────────────────────────────────
var MERMAID_TYPES = [
  { label: 'flowchart TD', detail: 'Diagramme de flux (top-down)', insert: 'flowchart TD\n    ' },
  { label: 'flowchart LR', detail: 'Diagramme de flux (gauche-droite)', insert: 'flowchart LR\n    ' },
  { label: 'sequenceDiagram', detail: 'Sequence (acteurs + messages)', insert: 'sequenceDiagram\n    ' },
  { label: 'classDiagram', detail: 'Diagramme de classes UML', insert: 'classDiagram\n    ' },
  { label: 'stateDiagram-v2', detail: 'Diagramme d\'etats', insert: 'stateDiagram-v2\n    ' },
  { label: 'erDiagram', detail: 'Diagramme Entite-Relation', insert: 'erDiagram\n    ' },
  { label: 'journey', detail: 'Parcours utilisateur', insert: 'journey\n    ' },
  { label: 'gantt', detail: 'Diagramme de Gantt', insert: 'gantt\n    ' },
  { label: 'pie', detail: 'Diagramme circulaire', insert: 'pie\n    ' },
  { label: 'gitGraph', detail: 'Historique Git', insert: 'gitGraph\n    ' },
  { label: 'mindmap', detail: 'Carte mentale', insert: 'mindmap\n    ' },
  { label: 'timeline', detail: 'Ligne du temps', insert: 'timeline\n    ' },
  { label: 'quadrantChart', detail: 'Graphique quadrants', insert: 'quadrantChart\n    ' },
  { label: 'xychart-beta', detail: 'Graphique XY', insert: 'xychart-beta\n    ' },
  { label: 'block-beta', detail: 'Diagramme de blocs', insert: 'block-beta\n    ' }
];

var MERMAID_SYNTAX = {
  'flowchart': [
    { label: 'A-->B', detail: 'Fleche', insert: '-->' },
    { label: 'A--text-->B', detail: 'Fleche avec texte', insert: '-- texte -->' },
    { label: 'A-.->B', detail: 'Fleche pointillee', insert: '-.->' },
    { label: 'A==>B', detail: 'Fleche epaisse', insert: '==>' },
    { label: 'subgraph', detail: 'Sous-graphe', insert: 'subgraph titre\n    \nend' },
    { label: 'style A fill:#xxx', detail: 'Style de noeud', insert: 'style A fill:#333,stroke:#58a6ff' },
    { label: 'classDef', detail: 'Classe CSS', insert: 'classDef default fill:#333,stroke:#58a6ff' }
  ],
  'sequenceDiagram': [
    { label: 'participant X', detail: 'Declarer acteur', insert: 'participant Nom' },
    { label: 'A->>B: msg', detail: 'Message', insert: '->> : ' },
    { label: 'A-->>B: msg', detail: 'Message asynchrone', insert: '-->> : ' },
    { label: 'Note over A,B', detail: 'Note', insert: 'Note over A,B: ' },
    { label: 'loop text', detail: 'Boucle', insert: 'loop description\n    \nend' },
    { label: 'alt/else', detail: 'Alternative', insert: 'alt condition\n    \nelse\n    \nend' },
    { label: 'activate A', detail: 'Activer ligne de vie', insert: 'activate A' }
  ],
  'classDiagram': [
    { label: 'class Nom {', detail: 'Declarer classe', insert: 'class Nom {\n    \n}' },
    { label: '+methode()', detail: 'Methode publique', insert: '+nom() Type' },
    { label: '-attribut', detail: 'Attribut prive', insert: '-nom Type' },
    { label: 'Heritage', detail: 'Relation heritage', insert: ' <|-- ' },
    { label: 'Composition', detail: 'Relation composition', insert: ' *-- ' }
  ],
  'gantt': [
    { label: 'dateFormat', detail: 'Format de date', insert: 'dateFormat YYYY-MM-DD' },
    { label: 'section', detail: 'Section Gantt', insert: 'section Nom' },
    { label: 'tache : apres', detail: 'Tache avec dependance', insert: ' : after tache1, 3d' }
  ],
  'pie': [
    { label: 'title', detail: 'Titre du pie', insert: 'title Titre du graphique' },
    { label: '"Label" : val', detail: 'Valeur', insert: '"Label" : 50' }
  ],
  'mindmap': [
    { label: 'root', detail: 'Racine', insert: 'root((Sujet))' },
    { label: 'branche', detail: 'Sous-sujet', insert: '\n    Sous-sujet' },
    { label: 'leaf', detail: 'Feuille', insert: '\n        Detail' }
  ]
};

var CODE_LANGUAGES = [
  { label: 'python', detail: 'Python', insert: 'python' },
  { label: 'javascript', detail: 'JavaScript', insert: 'javascript' },
  { label: 'typescript', detail: 'TypeScript', insert: 'typescript' },
  { label: 'bash', detail: 'Bash / Shell', insert: 'bash' },
  { label: 'sql', detail: 'SQL', insert: 'sql' },
  { label: 'json', detail: 'JSON', insert: 'json' },
  { label: 'yaml', detail: 'YAML', insert: 'yaml' },
  { label: 'html', detail: 'HTML', insert: 'html' },
  { label: 'css', detail: 'CSS', insert: 'css' },
  { label: 'dockerfile', detail: 'Dockerfile', insert: 'dockerfile' },
  { label: 'mermaid', detail: 'Mermaid (diagrammes)', insert: 'mermaid' },
  { label: 'markdown', detail: 'Markdown', insert: 'markdown' },
  { label: 'rust', detail: 'Rust', insert: 'rust' },
  { label: 'go', detail: 'Go', insert: 'go' },
  { label: 'java', detail: 'Java', insert: 'java' }
];

var CODE_SNIPPETS = {
  python: [
    { label: 'def', detail: 'Fonction', insert: 'def nom(params):\n    ' },
    { label: 'class', detail: 'Classe', insert: 'class Nom:\n    def __init__(self):\n        ' },
    { label: 'if/else', detail: 'Condition', insert: 'if condition:\n    \nelse:\n    ' },
    { label: 'for', detail: 'Boucle for', insert: 'for item in iterable:\n    ' },
    { label: 'try/except', detail: 'Try-except', insert: 'try:\n    \nexcept Exception as e:\n    ' },
    { label: 'import', detail: 'Import', insert: 'import ' },
    { label: 'print', detail: 'Print', insert: 'print()' },
    { label: 'lambda', detail: 'Lambda', insert: 'lambda x: ' }
  ],
  javascript: [
    { label: 'function', detail: 'Fonction', insert: 'function nom(params) {\n    \n}' },
    { label: 'const', detail: 'Constante', insert: 'const nom = ' },
    { label: '=>', detail: 'Fleche', insert: '(params) => {\n    \n}' },
    { label: 'if/else', detail: 'Condition', insert: 'if (cond) {\n    \n} else {\n    \n}' },
    { label: 'for', detail: 'Boucle for', insert: 'for (let i = 0; i < n; i++) {\n    \n}' },
    { label: 'try/catch', detail: 'Try-catch', insert: 'try {\n    \n} catch (e) {\n    \n}' },
    { label: 'console.log', detail: 'Console log', insert: 'console.log()' },
    { label: 'async/await', detail: 'Async function', insert: 'async function nom() {\n    await \n}' }
  ],
  bash: [
    { label: '#!/bin/bash', detail: 'Shebang', insert: '#!/bin/bash' },
    { label: 'if/fi', detail: 'Condition', insert: 'if [ condition ]; then\n    \nfi' },
    { label: 'for', detail: 'Boucle for', insert: 'for item in list; do\n    \ndone' },
    { label: 'case/esac', detail: 'Case', insert: 'case var in\n    pattern)\n        ;;\nesac' },
    { label: 'function', detail: 'Fonction', insert: 'nom() {\n    \n}' }
  ],
  sql: [
    { label: 'SELECT', detail: 'Select', insert: 'SELECT colonnes\nFROM table' },
    { label: 'JOIN', detail: 'Join', insert: 'JOIN table2 ON table1.id = table2.id' },
    { label: 'WHERE', detail: 'Where', insert: 'WHERE condition' },
    { label: 'GROUP BY', detail: 'Group by', insert: 'GROUP BY colonne' },
    { label: 'ORDER BY', detail: 'Order by', insert: 'ORDER BY colonne DESC' },
    { label: 'INSERT INTO', detail: 'Insert', insert: 'INSERT INTO table (cols) VALUES (vals)' },
    { label: 'CREATE TABLE', detail: 'Create table', insert: 'CREATE TABLE nom (\n    id INTEGER PRIMARY KEY,\n    \n)' }
  ]
};

var FRONTMATTER_FIELDS = [
  { label: 'title:', detail: 'Titre du document', insert: 'title: ' },
  { label: 'tags:', detail: 'Tags (liste)', insert: 'tags:\n  - ' },
  { label: 'date:', detail: 'Date', insert: 'date: ' + new Date().toISOString().slice(0,10) },
  { label: 'status:', detail: 'Statut', insert: 'status: en cours' },
  { label: 'category:', detail: 'Categorie', insert: 'category: ' },
  { label: 'publish:', detail: 'Publier (true/false)', insert: 'publish: true' },
  { label: 'favoris:', detail: 'Favoris (true/false)', insert: 'favoris: true' },
  { label: 'author:', detail: 'Auteur', insert: 'author: ' },
  { label: 'description:', detail: 'Description', insert: 'description: ' }
];

var MARKDOWN_FORMAT = [
  { label: '# H1', detail: 'Titre niveau 1', insert: '# ' },
  { label: '## H2', detail: 'Titre niveau 2', insert: '## ' },
  { label: '### H3', detail: 'Titre niveau 3', insert: '### ' },
  { label: '**gras**', detail: 'Texte en gras', insert: '****' },
  { label: '*italique*', detail: 'Texte en italique', insert: '**' },
  { label: '`code`', detail: 'Code inline', insert: '``' },
  { label: '[lien](url)', detail: 'Lien', insert: '[]()' },
  { label: '![image](url)', detail: 'Image', insert: '![]()' },
  { label: '- liste', detail: 'Liste a puces', insert: '- ' },
  { label: '1. liste', detail: 'Liste numerotee', insert: '1. ' },
  { label: '> citation', detail: 'Citation', insert: '> ' },
  { label: '---', detail: 'Separateur horizontal', insert: '\n---\n' },
  { label: '> [!note]', detail: 'Callout Note', insert: '> [!note] Titre\n> Contenu' },
  { label: '> [!warning]', detail: 'Callout Warning', insert: '> [!warning] Titre\n> Contenu' },
  { label: '> [!tip]', detail: 'Callout Tip', insert: '> [!tip] Titre\n> Contenu' },
  { label: '> [!danger]', detail: 'Callout Danger', insert: '> [!danger] Titre\n> Contenu' }
];

// ── Context Detection ─────────────────────────────────────────────────
function detectContext(text, cursorPos) {
  var before = text.slice(0, cursorPos);
  var after = text.slice(cursorPos);
  var lines = before.split('\n');
  var currentLine = lines[lines.length - 1] || '';
  var lineNum = lines.length;

  // Check for code fence context (look backwards for unclosed ```)
  var inFence = null;
  var fenceLang = '';
  var fenceStart = 0;
  for (var i = lines.length - 1; i >= 0; i--) {
    var l = lines[i].trim();
    var m = l.match(/^```(\w*)/);
    if (m) {
      if (inFence === null) {
        inFence = true;
        fenceLang = m[1] || '';
        fenceStart = i + 1;
      } else {
        inFence = false;
        break;
      }
    }
  }

  if (inFence) {
    if (fenceLang === 'mermaid') return { type: 'mermaid', lang: '', line: currentLine };
    return { type: 'code', lang: fenceLang, line: currentLine };
  }

  // Check for frontmatter context (between first and second ---)
  if (lineNum >= 2) {
    var firstSep = -1, secondSep = -1;
    for (var j = 0; j < lines.length; j++) {
      if (lines[j].trim() === '---') {
        if (firstSep === -1) firstSep = j;
        else if (secondSep === -1) { secondSep = j; break; }
      }
    }
    if (firstSep === 0 && secondSep === -1) {
      return { type: 'frontmatter', line: currentLine };
    }
  }

  // Check for wikilink
  if (/\[\[$/.test(currentLine) || /\[\[[^\]]*$/.test(currentLine)) {
    var partial = (currentLine.match(/\[\[([^\]]*)$/) || ['',''])[1];
    return { type: 'wikilink', partial: partial, line: currentLine };
  }

  // Check for markdown link
  if (/\[.*\]\($/.test(currentLine)) {
    return { type: 'link', line: currentLine };
  }

  // Check for triple backtick (about to open fence)
  if (/```$/.test(before) || /^```\s*$/.test(currentLine)) {
    return { type: 'fence_open', line: currentLine };
  }

  // Check if inside a markdown table
  if (/^\|.*\|$/.test(currentLine.trim())) {
    return { type: 'table', line: currentLine };
  }

  // Plain text / markdown
  return { type: 'markdown', line: currentLine };
}

// ── Suggestion Engine ─────────────────────────────────────────────────
function suggest(text, cursorPos) {
  var ctx = detectContext(text, cursorPos);
  var items = [];
  var prefix = '';

  var currentLine = ctx.line;

  switch (ctx.type) {
    case 'mermaid':
      // Try to match mermaid type already declared
      var mermaidMatch = text.match(/```mermaid\s*\n(\w+)/);
      if (mermaidMatch) {
        var mmType = mermaidMatch[1];
        items = MERMAID_SYNTAX[mmType] || [];
      }
      if (items.length === 0) {
        items = MERMAID_TYPES;
      }
      break;

    case 'code':
      items = CODE_SNIPPETS[ctx.lang] || [];
      break;

    case 'fence_open':
      items = CODE_LANGUAGES;
      break;

    case 'frontmatter':
      prefix = currentLine.trim();
      items = FRONTMATTER_FIELDS.filter(function(f) {
        return f.label.startsWith(prefix) || prefix === '';
      }).map(function(f) {
        return { label: f.label, detail: f.detail, insert: prefix ? f.insert : f.insert };
      });
      return {
        context: ctx.type,
        items: items.length > 0 ? items : FRONTMATTER_FIELDS.map(function(f) {
          return { label: f.label, detail: f.detail, insert: f.insert };
        })
      };

    case 'wikilink':
      return {
        context: 'wikilink',
        items: [],
        partial: ctx.partial,
        async: true  // requires file index lookup
      };

    case 'markdown':
    default:
      // At start of line: markdown formatting
      if (currentLine.trim().length < 3) {
        items = MARKDOWN_FORMAT;
      } else {
        items = [];
      }
      break;
  }

  var filtered = items.filter(function(item) {
    return !prefix || item.label.toLowerCase().indexOf(prefix.toLowerCase()) !== -1;
  });

  return {
    context: ctx.type,
    items: filtered.length > 0 ? filtered : items
  };
}

// ── Wikilink async completion (fetches file list from server) ─────────
var _fileCache = null;
var _fileCacheTime = 0;

function searchWikilinks(partial, callback) {
  var now = Date.now();
  // Use cached file list if fresh (< 30s)
  if (_fileCache && (now - _fileCacheTime) < 30000) {
    callback(filterFiles(partial));
    return;
  }

  try {
    fetch('/api/search/advanced?q=**&vault=all&limit=500')
      .then(function(r) { return r.json(); })
      .then(function(data) {
        _fileCache = (data.results || []).map(function(r) {
          return {
            path: r.path,
            title: r.title || r.path.replace(/\.md$/i, ''),
            vault: r.vault,
            name: r.path.split('/').pop().replace(/\.md$/i, '')
          };
        });
        _fileCacheTime = now;
        callback(filterFiles(partial));
      })
      .catch(function() { callback([]); });
  } catch(e) { callback([]); }
}

function filterFiles(partial) {
  if (!_fileCache) return [];
  var q = (partial || '').toLowerCase();
  return _fileCache.filter(function(f) {
    return f.name.toLowerCase().indexOf(q) !== -1 || f.path.toLowerCase().indexOf(q) !== -1;
  }).slice(0, 20).map(function(f) {
    return {
      label: f.name,
      detail: f.path,
      insert: f.path + ']]',
      vault: f.vault
    };
  });
}

export { suggest, searchWikilinks, detectContext, MERMAID_TYPES, CODE_LANGUAGES, FRONTMATTER_FIELDS, MARKDOWN_FORMAT };