import 'package:flutter/widgets.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

/// A glyph per state, keyed by the backend's state code.
///
/// ── Why the state and not the district ──
///
/// The first version of this marked every *district*: Chennai a capital,
/// Coimbatore a factory, Tiruppur knitwear, and so on down a flat list of
/// twelve. It scanned well at twelve. It does not survive sixty — and more to
/// the point, it put the app in the business of having an opinion about every
/// district in India, which is a table nobody can keep honest and a mistake
/// somebody eventually finds offensive.
///
/// There are twenty-eight states. Giving each one a mark is a bounded problem,
/// the marks stay recognisable, and the district list underneath is left as
/// what it should be: names and delivery promises, nothing competing with them.
///
/// ── The rule each glyph follows ──
///
/// One thing about the place that a person living in India would recognise,
/// and never a religious building — a temple state drawn as a church is worse
/// than no icon at all. These are editorial choices, not data: they are meant
/// to be argued with and changed, which is why they are one table in one file.
///
/// ── The fallback is the contract ──
///
/// [stateMark] answers for every code, including ones that do not exist yet.
/// The serviceable list is the backend's, so a state opened there appears here
/// immediately — with the pin, looking deliberate, until somebody adds a line.
/// Nothing renders blank and nothing throws. Adding a state is one entry;
/// forgetting to is not a bug.
const Map<String, IconData> _marks = {
  'TN': LucideIcons.landmark, // the gopuram silhouette
  'KL': LucideIcons.treePalm, // the backwaters
  'KA': LucideIcons.crown, // the Mysuru palace
  'AP': LucideIcons.mountain, // the eastern ghats
  'TG': LucideIcons.castle, // the Golconda fort
  'MH': LucideIcons.ship, // the Bombay harbour
  'GA': LucideIcons.sailboat,
  'PY': LucideIcons.waves,
};

/// The mark for a state code, or a pin for one nobody has named yet.
IconData stateMark(String? stateCode) =>
    _marks[stateCode] ?? LucideIcons.mapPin;