import { useEffect, useState } from 'react'

import DateTimeField from '@/components/common/DateTimeField'
import { Button } from '@/components/ui/button'
import { countsEventTypes, countsFieldLabel, countsFilterFields,
	 readCountsJSON, useCountsDefinition }
    from '@/lib/countsDefinitions'
import useDialogue from '@/lib/dialogues/useDialogue'
import { inputClass } from '@/lib/utils'
import { useUITranslation } from '@/lib/useUITranslation'

import type { DialogueFormControls } from '@/lib/dialogues/useDialogue'
import type { CountsCondition, CountsDefinition } from '@/lib/countsDefinitions'


const ConditionEditor = (
    { definition, initial, controls, save }: {
	definition: CountsDefinition; initial?: CountsCondition
	controls: DialogueFormControls
	save: (condition: CountsCondition) => void },
) => {
  const { label, message } = useUITranslation ('counts')
  const fields = countsFilterFields (definition)
  const [field, setField] = useState (initial?.field ?? 'resource_id')
  const [operator, setOperator] = useState (initial?.operator ?? 'eq')
  const operators = definition.fields.find (item => item.key === field)?.operators ?? []
  useEffect (() => {
    controls.setActions ([{ label: label (initial == null ? 'add' : 'shared:actions.edit'),
	onSelect: () => save ({ ...initial, field, operator }) }])
  }, [controls, field, operator, initial, label, save])
  return <div className="space-y-2">
    <select value={field} aria-label={message ('field').text} className={inputClass ()}
        onChange={event => { setField (event.target.value); setOperator ('eq') }}>
      {Object.keys (fields).filter (key => fields[key] !== 'json').map (key => (
          <option key={key} value={key}>{message (countsFieldLabel (key)).text}</option>))}
    </select>
    <select value={operator} aria-label={message ('operator').text} className={inputClass ()}
        onChange={event => setOperator (event.target.value)}>
      {operators.map (key => <option key={key} value={key}>
        {message (`operators.${key}`).text}</option>)}
    </select>
  </div>
}


const CountsAdditionalConditions = ({ params, update }: {
    params: URLSearchParams
    update: (key: string, value: string) => void },
) => {
  const { label, message } = useUITranslation ('counts')
  const definition = useCountsDefinition ()
  const dialogue = useDialogue ()
  const conditions = readCountsJSON<CountsCondition[]> (params, 'conditions', [])
  const write = (next: CountsCondition[]) => update ('conditions', JSON.stringify (next))
  const edit = (index?: number) => {
    const initial = index == null ? undefined : conditions[index]
    const save = (condition: CountsCondition) => {
      write (index == null ? [...conditions, condition]
          : conditions.map ((item, position) => position === index ? condition : item))
    }
    dialogue.form ({ title: label ('additionalConditions'), footerLayout: 'inline',
        body: controls => <ConditionEditor definition={definition}
            initial={initial} controls={controls} save={save}/> })
  }
  const patch = (index: number, change: Partial<CountsCondition>) => write (
      conditions.map ((item, position) => position === index ? { ...item, ...change } : item))
  return <fieldset className="space-y-1">
    <legend className="flex items-center gap-2">{label ('additionalConditions')}
      <Button type="button" variant="outline" size="sm" onClick={() => edit ()}>
        {label ('add')}</Button></legend>
    {conditions.map ((condition, index) => {
      const datetime = countsFilterFields (definition)[condition.field] === 'datetime'
      return <div key={index} className="flex flex-wrap items-center gap-1">
        <button type="button" onClick={() => edit (index)}>
	  {label (countsFieldLabel (condition.field))}
	  {' · '}{label (`operators.${condition.operator}`)}
        </button>
        {(condition.operator === 'range' ? ['value', 'end'] as const : ['value'] as const)
	    .map (key => condition.field === 'event_type' ? (
		<select key={key} value={condition[key] ?? ''} disabled={condition.blank}
		    className={inputClass (false, 'w-36 py-1')}
		    aria-label={message ('value').text}
		    onChange={event => patch (index, { [key]: event.target.value })}>
		  <option value=""/>
		  {condition[key] && !countsEventTypes.some (event => event === condition[key])
		      && <option value={condition[key]}>{condition[key]}</option>}
		  {countsEventTypes.map (event => <option key={event} value={event}
		      lang={message (`events.${event}`).language}>
		    {message (`events.${event}`).text}</option>)}
		</select>) : (datetime ? <DateTimeField precision="second" key={key}
                value={condition[key] ?? ''} disabled={condition.blank}
                aria-label={message (key === 'end' ? 'through' : 'value').text}
                onChange={value => patch (index, { [key]: value ?? '' })}/> : (
                <input key={key} value={condition[key] ?? ''} disabled={condition.blank}
                    className={inputClass (false, 'w-36 py-1')}
                    aria-label={message ('value').text}
		    onChange={event => patch (index, { [key]: event.target.value })}/>)))}
        <label className="inline-flex items-center gap-1">
          <input type="checkbox" checked={condition.blank ?? false}
              onChange={event => patch (index, { blank: event.target.checked })}/>
          {label ('blank')}</label>
        <button type="button" aria-label={message ('remove').text}
	    onClick={() => write (conditions.filter (
		(_, position) => index !== position))}>×</button>
      </div>
    })}
  </fieldset>
}


export default CountsAdditionalConditions