import type { ConfigResponse } from '../../../../../packages/api-contracts/src/index.js';
import type { SettingsDraft, SubredditDraft } from './settings-model.js';

interface SectionProps {
  draft: SettingsDraft;
  errors: Record<string, string>;
  onChange(next: SettingsDraft): void;
}

interface NumberFieldProps {
  error?: string;
  label: string;
  name: string;
  min?: number;
  value: string;
  onChange(value: string): void;
}

function NumberField({ error, label, name, min, value, onChange }: NumberFieldProps) {
  const errorId = `${name}-error`;
  return (
    <label className="settings-field">
      <span>{label}</span>
      <input
        aria-describedby={error ? errorId : undefined}
        aria-invalid={error ? 'true' : undefined}
        aria-label={label}
        min={min}
        name={name}
        onChange={(event) => onChange(event.target.value)}
        step="1"
        type="number"
        value={value}
      />
      {error ? <small className="field-error" id={errorId}>{error}</small> : null}
    </label>
  );
}

export function MonitoringSection({ draft, errors, onChange }: SectionProps) {
  return (
    <section aria-labelledby="monitoring-heading" className="panel settings-section">
      <div className="panel-heading"><div><span className="eyebrow">Discovery</span><h2 id="monitoring-heading">Monitoring</h2></div></div>
      <label className="toggle-field">
        <input
          aria-label="Prioritise recent posts"
          checked={draft.prioritizeRecentPosts}
          onChange={(event) => onChange({ ...draft, prioritizeRecentPosts: event.target.checked })}
          type="checkbox"
        />
        <span><strong>Prioritise recent posts</strong><small>Prefer posts inside the configured recent window.</small></span>
      </label>
      <NumberField
        error={errors.recentWindowMinutes}
        label="Recent window in minutes"
        min={1}
        name="recent-window"
        onChange={(recentWindowMinutes) => onChange({ ...draft, recentWindowMinutes })}
        value={draft.recentWindowMinutes}
      />
    </section>
  );
}

export function RateLimitsSection({ draft, errors, onChange }: SectionProps) {
  return (
    <section aria-labelledby="rate-limits-heading" className="panel settings-section">
      <div className="panel-heading"><div><span className="eyebrow">Sending safeguards</span><h2 id="rate-limits-heading">Rate limits</h2></div></div>
      <div className="settings-grid">
        <NumberField
          error={errors.minDelayMinutes}
          label="Minimum delay in minutes"
          min={0}
          name="minimum-delay"
          onChange={(minDelayMinutes) => onChange({ ...draft, minDelayMinutes })}
          value={draft.minDelayMinutes}
        />
        <NumberField
          error={errors.maxMessagesPerHour}
          label="Maximum messages per hour"
          min={1}
          name="hourly-limit"
          onChange={(maxMessagesPerHour) => onChange({ ...draft, maxMessagesPerHour })}
          value={draft.maxMessagesPerHour}
        />
        <NumberField
          error={errors.jitterSeconds}
          label="Random jitter in seconds"
          min={0}
          name="jitter"
          onChange={(jitterSeconds) => onChange({ ...draft, jitterSeconds })}
          value={draft.jitterSeconds}
        />
      </div>
    </section>
  );
}

function updateSubreddit(draft: SettingsDraft, index: number, next: SubredditDraft): SettingsDraft {
  return { ...draft, subreddits: draft.subreddits.map((item, itemIndex) => itemIndex === index ? next : item) };
}

export function BehaviourSection({ config, draft, errors, onChange }: SectionProps & { config: ConfigResponse }) {
  return (
    <section aria-labelledby="behaviour-heading" className="panel settings-section">
      <div className="panel-heading"><div><span className="eyebrow">Runtime behaviour</span><h2 id="behaviour-heading">Behaviour</h2></div></div>
      <label className="toggle-field">
        <input
          aria-label="Dry run mode"
          checked={draft.dryRun}
          onChange={(event) => onChange({ ...draft, dryRun: event.target.checked })}
          type="checkbox"
        />
        <span><strong>Dry run mode</strong><small>Evaluate posts without sending messages.</small></span>
      </label>

      <div className="subreddit-heading">
        <div><h3>Subreddits</h3><p>Configure monitored communities and their supported message style.</p></div>
        <button
          className="button secondary"
          onClick={() => onChange({
            ...draft,
            subreddits: [
              ...draft.subreddits,
              { name: '', enabled: true, type: 'image', weight: '1', tone: 'default', scripted: '' },
            ],
          })}
          type="button"
        >
          Add subreddit
        </button>
      </div>
      {errors.subreddits ? <p className="field-error" role="alert">{errors.subreddits}</p> : null}
      <div className="subreddit-list">
        {draft.subreddits.map((subreddit, index) => (
          <fieldset className="subreddit-row" key={index}>
            <legend>Subreddit {index + 1}</legend>
            <label className="settings-field">
              <span>Name</span>
              <input
                aria-describedby={errors[`subreddits.${index}.name`] ? `subreddit-${index}-name-error` : undefined}
                aria-invalid={errors[`subreddits.${index}.name`] ? 'true' : undefined}
                aria-label={`Subreddit ${index + 1} name`}
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, name: event.target.value }))}
                type="text"
                value={subreddit.name}
              />
              {errors[`subreddits.${index}.name`] ? <small className="field-error" id={`subreddit-${index}-name-error`}>{errors[`subreddits.${index}.name`]}</small> : null}
            </label>
            <label className="settings-field">
              <span>Type</span>
              <select
                aria-label={`Subreddit ${index + 1} type`}
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, type: event.target.value as SubredditDraft['type'] }))}
                value={subreddit.type}
              >
                <option value="image">Image</option><option value="chat">Chat</option>
              </select>
            </label>
            <label className="toggle-field">
              <input
                aria-label={`Subreddit ${index + 1} enabled`}
                checked={subreddit.enabled}
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, enabled: event.target.checked }))}
                type="checkbox"
              />
              <span><strong>Enabled</strong><small>Disabled subreddits are not polled.</small></span>
            </label>
            <label className="settings-field">
              <span>Weight</span>
              <input
                aria-describedby={errors[`subreddits.${index}.weight`] ? `subreddit-${index}-weight-error` : undefined}
                aria-invalid={errors[`subreddits.${index}.weight`] ? 'true' : undefined}
                aria-label={`Subreddit ${index + 1} weight`}
                min="0.01"
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, weight: event.target.value }))}
                step="0.01"
                type="number"
                value={subreddit.weight}
              />
              {errors[`subreddits.${index}.weight`] ? <small className="field-error" id={`subreddit-${index}-weight-error`}>{errors[`subreddits.${index}.weight`]}</small> : null}
            </label>
            <label className="settings-field">
              <span>Tone</span>
              <select
                aria-label={`Subreddit ${index + 1} tone`}
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, tone: event.target.value as SubredditDraft['tone'] }))}
                value={subreddit.tone}
              >
                {config.tones.map((tone) => <option key={tone} value={tone}>{tone}</option>)}
              </select>
            </label>
            <label className="settings-field scripted-field">
              <span>Scripted message (optional)</span>
              <textarea
                aria-label={`Subreddit ${index + 1} scripted message`}
                onChange={(event) => onChange(updateSubreddit(draft, index, { ...subreddit, scripted: event.target.value }))}
                rows={2}
                value={subreddit.scripted}
              />
            </label>
            <button
              className="button secondary remove-subreddit"
              disabled={draft.subreddits.length === 1}
              onClick={() => onChange({
                ...draft,
                subreddits: draft.subreddits.filter((_, itemIndex) => itemIndex !== index),
              })}
              type="button"
            >
              Remove subreddit {index + 1}
            </button>
          </fieldset>
        ))}
      </div>
      {config.advanced ? (
        <div className="advanced-settings">
          <div><h3>Advanced application configuration</h3><p>Models, prompts, filtering, media sync, and strategy settings. Some changes take effect after a restart.</p></div>
          <label className="settings-field">
            <span>Advanced configuration (JSON)</span>
            <textarea
              aria-invalid={errors.advancedConfigJson ? 'true' : undefined}
              aria-label="Advanced configuration JSON"
              onChange={(event) => onChange({ ...draft, advancedConfigJson: event.target.value })}
              rows={24}
              spellCheck={false}
              value={draft.advancedConfigJson}
            />
            {errors.advancedConfigJson ? <small className="field-error">{errors.advancedConfigJson}</small> : null}
          </label>
        </div>
      ) : null}
    </section>
  );
}