"use client"

import { cn } from "@/lib/utils"
import type { Mode } from "@/components/logic"

interface SettingsPanelProps {
  mode: Mode
  totalTasks: number
  pickCount: number
  rounds: number
  allowRepeat: boolean
  singleAllowRepeat: boolean
  selectedRecords: { number: number; colorIndex: number }[]
  onModeChange: (v: Mode) => void
  onTotalTasksChange: (v: number) => void
  onPickCountChange: (v: number) => void
  onRoundsChange: (v: number) => void
  onAllowRepeatChange: (v: boolean) => void
  onSingleAllowRepeatChange: (v: boolean) => void
  onRoll: () => void
  onReset: () => void
  isRolling: boolean
  errorMsg: string
}

function FieldRow({
  label,
  hint,
  value,
  onChange,
  min = 1,
}: {
  label: string
  hint: string
  value: number
  onChange: (v: number) => void
  min?: number
}) {
  return (
    <div className="flex items-center justify-between gap-4">
      <div className="min-w-0">
        <div className="text-xs text-[#16191f] leading-none mb-0.5">{label}</div>
        <div className="text-[10px] text-[#8a95a1] leading-none">{hint}</div>
      </div>
      <div className="flex items-center gap-0 border border-[#e2e6ea] flex-shrink-0">
        <button
          onClick={() => onChange(Math.max(min, value - 1))}
          className="w-7 h-7 flex items-center justify-center text-[#8a95a1] hover:text-[#16191f] hover:bg-[#f1f3f5] transition-colors text-base leading-none"
          aria-label={`减少${label}`}
        >
          −
        </button>
        <input
          type="number"
          value={value}
          min={min}
          onChange={(e) => {
            const v = parseInt(e.target.value, 10)
            if (!isNaN(v) && v >= min) onChange(v)
          }}
          className={cn(
            "w-12 h-7 text-center text-sm font-mono text-[#16191f] bg-[#f7f8fa]",
            "border-x border-[#e2e6ea]",
            "focus:outline-none focus:bg-[#ffffff]",
            "[appearance:textfield] [&::-webkit-inner-spin-button]:appearance-none"
          )}
        />
        <button
          onClick={() => onChange(value + 1)}
          className="w-7 h-7 flex items-center justify-center text-[#8a95a1] hover:text-[#16191f] hover:bg-[#f1f3f5] transition-colors text-base leading-none"
          aria-label={`增加${label}`}
        >
          +
        </button>
      </div>
    </div>
  )
}

export function SettingsPanel({
  mode,
  totalTasks,
  pickCount,
  rounds,
  allowRepeat,
  singleAllowRepeat,
  selectedRecords,
  onModeChange,
  onTotalTasksChange,
  onPickCountChange,
  onRoundsChange,
  onAllowRepeatChange,
  onSingleAllowRepeatChange,
  onRoll,
  onReset,
  isRolling,
  errorMsg,
}: SettingsPanelProps) {
  const repeatDisabled = rounds < 2
  const isSingleMode = mode === "single"

  return (
    <div className="flex flex-col gap-0">
      {/* Mode selector */}
      <div className="flex gap-2 mb-6">
        <button
          onClick={() => onModeChange("single")}
          className={cn(
            "flex-1 h-9 border text-xs tracking-wider uppercase transition-colors",
            isSingleMode
              ? "border-[#0f141a] bg-[#0f141a] text-[#ffffff]"
              : "border-[#e2e6ea] text-[#8a95a1] hover:border-[#cdd2d8] hover:text-[#16191f]"
          )}
        >
          单次模式
        </button>
        <button
          onClick={() => onModeChange("multi")}
          className={cn(
            "flex-1 h-9 border text-xs tracking-wider uppercase transition-colors",
            !isSingleMode
              ? "border-[#0f141a] bg-[#0f141a] text-[#ffffff]"
              : "border-[#e2e6ea] text-[#8a95a1] hover:border-[#cdd2d8] hover:text-[#16191f]"
          )}
        >
          分组模式
        </button>
      </div>

      {/* Section label */}
      <div className="flex items-center gap-2 mb-4">
        <span className="text-[10px] tracking-[0.2em] uppercase text-[#8a95a1] font-mono">CONFIG</span>
        <span className="flex-1 h-px bg-[#e2e6ea]" />
      </div>

      {/* Fields */}
      <div className="flex flex-col gap-4 mb-6">
        <FieldRow label="总人数" hint="参与点名的序号上限" value={totalTasks} onChange={onTotalTasksChange} />
        <div className="h-px bg-[#e2e6ea]" />
        <FieldRow 
          label="每次人数" 
          hint={isSingleMode ? "每次抽取的人数" : "每组抽取的人数"} 
          value={pickCount} 
          onChange={onPickCountChange} 
        />
        {!isSingleMode && (
          <>
            <div className="h-px bg-[#e2e6ea]" />
            <FieldRow label="抽取组数" hint="生成分组的数量" value={rounds} onChange={onRoundsChange} min={1} />
          </>
        )}
      </div>

      {/* Single mode: Allow repeat toggle */}
      {isSingleMode && (
        <button
          type="button"
          onClick={() => onSingleAllowRepeatChange(!singleAllowRepeat)}
          className={cn(
            "flex items-center justify-between w-full px-3 py-2.5 border mb-6 transition-colors",
            singleAllowRepeat && "border-[#0f141a] bg-[#f1f3f5]",
            !singleAllowRepeat && "border-[#e2e6ea] hover:border-[#cdd2d8]"
          )}
        >
          <div className="text-left">
            <div className={cn("text-xs", singleAllowRepeat ? "text-[#0f141a]" : "text-[#4a5563]")}>
              允许重复选人
            </div>
            <div className="text-[10px] text-[#8a95a1] mt-0.5">已选过的人可再次被抽中</div>
          </div>
          {/* Toggle pill */}
          <div className={cn(
            "w-9 h-5 border relative flex-shrink-0 transition-colors",
            singleAllowRepeat ? "border-[#0f141a] bg-[#0f141a]/10" : "border-[#cdd2d8]"
          )}>
            <span className={cn(
              "absolute top-0.5 w-3 h-3 transition-all duration-150 rounded-full",
              singleAllowRepeat
                ? "left-[calc(100%-15px)] bg-[#0f141a]"
                : "left-0.5 bg-[#cdd2d8]"
            )} />
          </div>
        </button>
      )}

      {/* Group mode only: Toggle */}
      {!isSingleMode && (
        <>
          {/* Toggle */}
          <button
            type="button"
            disabled={repeatDisabled}
            onClick={() => !repeatDisabled && onAllowRepeatChange(!allowRepeat)}
            className={cn(
              "flex items-center justify-between w-full px-3 py-2.5 border mb-6 transition-colors",
              repeatDisabled && "opacity-40 cursor-not-allowed border-[#e2e6ea]",
              !repeatDisabled && allowRepeat && "border-[#0f141a] bg-[#f1f3f5]",
              !repeatDisabled && !allowRepeat && "border-[#e2e6ea] hover:border-[#cdd2d8]"
            )}
          >
            <div className="text-left">
              <div className={cn("text-xs", allowRepeat && !repeatDisabled ? "text-[#0f141a]" : "text-[#4a5563]")}>
                组间允许重复
              </div>
              <div className="text-[10px] text-[#8a95a1] mt-0.5">不同组可出现相同序号</div>
            </div>
            {/* Toggle pill */}
            <div className={cn(
              "w-9 h-5 border relative flex-shrink-0 transition-colors",
              allowRepeat && !repeatDisabled ? "border-[#0f141a] bg-[#0f141a]/10" : "border-[#cdd2d8]"
            )}>
              <span className={cn(
                "absolute top-0.5 w-3 h-3 transition-all duration-150 rounded-full",
                allowRepeat && !repeatDisabled
                  ? "left-[calc(100%-15px)] bg-[#0f141a]"
                  : "left-0.5 bg-[#cdd2d8]"
              )} />
            </div>
          </button>
        </>
      )}

      {/* Error */}
      {errorMsg && (
        <div className="border border-[#d92d20]/40 bg-[#d92d20]/5 px-3 py-2 mb-4 text-xs text-[#d92d20] leading-relaxed fui-fadein">
          ERR: {errorMsg}
        </div>
      )}

      {/* Action buttons */}
      <div className="flex gap-2">
        {/* Single mode: Roll button */}
        {isSingleMode && (
          <button
            onClick={onRoll}
            disabled={isRolling}
            className={cn(
              "flex-1 h-10 border text-xs tracking-[0.15em] uppercase font-mono transition-all",
              "disabled:opacity-40 disabled:cursor-not-allowed",
              isRolling
                ? "border-[#e2e6ea] text-[#8a95a1]"
                : "border-[#0f141a] bg-[#0f141a] text-[#ffffff] hover:bg-[#ffffff] hover:text-[#0f141a]"
            )}
          >
            {isRolling ? (
              <span className="flex items-center justify-center gap-2">
                <span className="inline-block w-3 h-3 border border-[#cdd2d8] border-t-[#16191f] rounded-full animate-spin" />
                PROCESSING
              </span>
            ) : (
              "SELECT"
            )}
          </button>
        )}

        {/* Single mode: Reset button */}
        {isSingleMode && selectedRecords.length > 0 && (
          <button
            onClick={onReset}
            className={cn(
              "h-10 px-4 border border-[#e2e6ea] text-xs tracking-wider uppercase font-mono transition-colors",
              "text-[#8a95a1] hover:border-[#d92d20] hover:text-[#d92d20]"
            )}
          >
            RESET
          </button>
        )}

        {/* Multi mode: Execute button */}
        {!isSingleMode && (
          <button
            onClick={onRoll}
            disabled={isRolling}
            className={cn(
              "w-full h-10 border text-xs tracking-[0.15em] uppercase font-mono transition-all",
              "disabled:opacity-40 disabled:cursor-not-allowed",
              isRolling
                ? "border-[#e2e6ea] text-[#8a95a1]"
                : "border-[#0f141a] bg-[#0f141a] text-[#ffffff] hover:bg-[#ffffff] hover:text-[#0f141a]"
            )}
          >
            {isRolling ? (
              <span className="flex items-center justify-center gap-2">
                <span className="inline-block w-3 h-3 border border-[#cdd2d8] border-t-[#16191f] rounded-full animate-spin" />
                PROCESSING
              </span>
            ) : (
              "EXECUTE"
            )}
          </button>
        )}
      </div>
    </div>
  )
}