import type { NuzlockeRules } from '../types/rules'
import { RULE_DEFINITIONS, DEFAULT_RULES } from '../types/rules'
import { RuleToggle } from './RuleToggle'
import { TypeBadge } from './TypeBadge'

const POKEMON_TYPES = [
  'bug',
  'dark',
  'dragon',
  'electric',
  'fairy',
  'fighting',
  'fire',
  'flying',
  'ghost',
  'grass',
  'ground',
  'ice',
  'normal',
  'poison',
  'psychic',
  'rock',
  'steel',
  'water',
] as const

interface RulesConfigurationProps {
  rules: NuzlockeRules
  onChange: (rules: NuzlockeRules) => void
  onReset?: (() => void) | undefined
  hiddenRules?: Set<keyof NuzlockeRules> | undefined
}

export function RulesConfiguration({
  rules,
  onChange,
  onReset,
  hiddenRules,
}: RulesConfigurationProps) {
  const visibleRules = hiddenRules
    ? RULE_DEFINITIONS.filter((r) => !hiddenRules.has(r.key))
    : RULE_DEFINITIONS
  const coreRules = visibleRules.filter((r) => r.category === 'core')
  const variantRules = visibleRules.filter((r) => r.category === 'variant')

  const handleRuleChange = (key: keyof NuzlockeRules, value: boolean) => {
    onChange({ ...rules, [key]: value })
  }

  const handleResetToDefault = () => {
    onChange(DEFAULT_RULES)
    onReset?.()
  }

  const allowedTypes = rules.allowedTypes ?? []

  const toggleType = (type: string) => {
    const next = allowedTypes.includes(type)
      ? allowedTypes.filter((t) => t !== type)
      : [...allowedTypes, type]
    onChange({ ...rules, allowedTypes: next })
  }

  const customRules = rules.customRules ?? ''

  const enabledCount =
    visibleRules.filter((r) => rules[r.key]).length +
    (allowedTypes.length > 0 ? 1 : 0) +
    (customRules.trim().length > 0 ? 1 : 0)
  const totalCount = visibleRules.length + 2 // +1 for type restriction, +1 for custom rules

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h2 className="text-xl font-semibold text-text-primary">Rules Configuration</h2>
          <p className="text-sm text-text-tertiary">
            {enabledCount} of {totalCount} rules enabled
          </p>
        </div>
        <button
          type="button"
          onClick={handleResetToDefault}
          className="text-sm text-text-link hover:text-accent-300"
        >
          Reset to Default
        </button>
      </div>

      <div className="bg-surface-1 rounded-lg shadow">
        <div className="px-4 py-3 border-b border-border-default">
          <h3 className="text-lg font-medium text-text-primary">Core Rules</h3>
          <p className="text-sm text-text-tertiary">
            The fundamental rules of a Nuzlocke challenge
          </p>
        </div>
        <div className="px-4">
          {coreRules.map((rule) => (
            <RuleToggle
              key={rule.key}
              name={rule.name}
              description={rule.description}
              enabled={rules[rule.key]}
              onChange={(value) => handleRuleChange(rule.key, value)}
            />
          ))}
        </div>
      </div>

      <div className="bg-surface-1 rounded-lg shadow">
        <div className="px-4 py-3 border-b border-border-default">
          <h3 className="text-lg font-medium text-text-primary">Custom Rules</h3>
          <p className="text-sm text-text-tertiary">
            Track your own rules — supports markdown. Doesn't affect tracker behavior.
          </p>
        </div>
        <div className="px-4 py-4">
          <textarea
            value={customRules}
            onChange={(e) => onChange({ ...rules, customRules: e.target.value })}
            placeholder="e.g. No items in battle, Set mode only, must match boss team size..."
            rows={4}
            className="w-full px-3 py-2 border rounded-md bg-surface-2 border-border-default text-text-primary placeholder:text-text-muted text-sm resize-y"
          />
        </div>
      </div>

      <div className="bg-surface-1 rounded-lg shadow">
        <div className="px-4 py-3 border-b border-border-default">
          <h3 className="text-lg font-medium text-text-primary">Run Variant</h3>
          <p className="text-sm text-text-tertiary">
            Changes which Pokémon can appear — affects the encounter selector
          </p>
        </div>
        <div className="px-4">
          {variantRules.map((rule) => (
            <RuleToggle
              key={rule.key}
              name={rule.name}
              description={rule.description}
              enabled={rules[rule.key]}
              onChange={(value) => handleRuleChange(rule.key, value)}
            />
          ))}
        </div>
      </div>

      <div className="bg-surface-1 rounded-lg shadow">
        <div className="px-4 py-3 border-b border-border-default">
          <h3 className="text-lg font-medium text-text-primary">Type Restriction</h3>
          <p className="text-sm text-text-tertiary">
            Monolocke and variants. Select allowed types — a Pokémon qualifies if it shares at least
            one type. Leave all deselected to disable.
          </p>
        </div>
        <div className="px-4 py-4">
          <div className="flex flex-wrap gap-2">
            {POKEMON_TYPES.map((type) => (
              <button
                key={type}
                type="button"
                onClick={() => toggleType(type)}
                title={type.charAt(0).toUpperCase() + type.slice(1)}
                className={`p-1.5 rounded-lg border-2 transition-colors ${
                  allowedTypes.includes(type)
                    ? 'border-accent-400 bg-accent-900/20'
                    : 'border-transparent opacity-40 hover:opacity-70'
                }`}
              >
                <TypeBadge type={type} size="md" />
              </button>
            ))}
          </div>
          {allowedTypes.length > 0 && (
            <button
              type="button"
              onClick={() => onChange({ ...rules, allowedTypes: [] })}
              className="mt-3 text-xs text-text-tertiary hover:text-text-secondary"
            >
              Clear selection
            </button>
          )}
        </div>
      </div>
    </div>
  )
}