import type { ReactNode } from 'react';

import type {
  CustomWorldCreatorIntent,
  CustomWorldGenerationMode,
} from '../types';
import { PlatformActionButton } from './common/PlatformActionButton';
import { PlatformModalCloseButton } from './common/PlatformModalCloseButton';
import { PlatformProgressBar } from './common/PlatformProgressBar';
import { PlatformStatusMessage } from './common/PlatformStatusMessage';
import { PlatformSubpanel } from './common/PlatformSubpanel';
import {
  PlatformSelectField,
  PlatformTextField,
} from './common/PlatformTextField';

type BaseModalProps = {
  isOpen: boolean;
  title: string;
  onClose: () => void;
  children: ReactNode;
  footer?: ReactNode;
};

function SelectionModal({
  isOpen,
  title,
  onClose,
  children,
  footer = null,
}: BaseModalProps) {
  if (!isOpen) return null;

  return (
    <div className="platform-overlay fixed inset-0 z-[90] flex items-center justify-center p-4 backdrop-blur-sm">
      <div className="platform-modal-shell platform-remap-surface flex max-h-[90vh] w-full max-w-2xl flex-col overflow-hidden rounded-3xl shadow-[0_30px_80px_rgba(0,0,0,0.55)]">
        <div className="flex items-center justify-between border-b border-white/10 px-5 py-4">
          <div className="text-base font-semibold text-white">{title}</div>
          <PlatformModalCloseButton
            label={`关闭${title}`}
            variant="editorDark"
            onClick={onClose}
          />
        </div>
        <div className="min-h-0 flex-1 overflow-y-auto px-5 py-5">
          {children}
        </div>
        {footer ? (
          <div className="flex flex-wrap items-center justify-end gap-3 border-t border-white/10 px-5 py-4">
            {footer}
          </div>
        ) : null}
      </div>
    </div>
  );
}

export function CharacterDraftModal(props: {
  isOpen: boolean;
  characterLabel: string;
  draftName: string;
  draftBackstory: string;
  onNameChange: (value: string) => void;
  onBackstoryChange: (value: string) => void;
  onClose: () => void;
  onConfirm: () => void;
  error?: string | null;
}) {
  const {
    isOpen,
    characterLabel,
    draftName,
    draftBackstory,
    onNameChange,
    onBackstoryChange,
    onClose,
    onConfirm,
    error = null,
  } = props;

  return (
    <SelectionModal
      isOpen={isOpen}
      title="角色自定义"
      onClose={onClose}
      footer={(
        <>
          <PlatformActionButton
            surface="editorDark"
            tone="secondary"
            size="sm"
            onClick={onClose}
          >
            取消
          </PlatformActionButton>
          <PlatformActionButton
            surface="editorDark"
            tone="success"
            size="sm"
            onClick={onConfirm}
          >
            确认进入
          </PlatformActionButton>
        </>
      )}
    >
      <div className="space-y-4">
        <PlatformSubpanel
          as="div"
          surface="dark"
          radius="md"
          padding="row"
          className="text-sm text-zinc-300"
        >
          当前角色：{characterLabel}
        </PlatformSubpanel>
        <label className="block">
          <div className="mb-2 text-sm font-medium text-zinc-200">角色名字</div>
          <PlatformTextField
            value={draftName}
            onChange={(event) => onNameChange(event.target.value)}
            placeholder="输入一个更贴合这次旅程的称呼"
            surface="editorDark"
            tone="emerald"
            density="roomy"
            className="rounded-2xl"
          />
        </label>
        <label className="block">
          <div className="mb-2 text-sm font-medium text-zinc-200">背景补充</div>
          <PlatformTextField
            variant="textarea"
            value={draftBackstory}
            onChange={(event) => onBackstoryChange(event.target.value)}
            rows={6}
            placeholder="可以补充这次开局想强调的身份、经历、执念或禁忌。"
            surface="editorDark"
            tone="emerald"
            size="md"
            density="roomy"
            className="rounded-2xl leading-7"
          />
        </label>
        {error ? (
          <PlatformStatusMessage
            tone="error"
            surface="editorDark"
            size="md"
            className="rounded-2xl"
          >
            {error}
          </PlatformStatusMessage>
        ) : null}
      </div>
    </SelectionModal>
  );
}

type CustomWorldCreatorModalProps = {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: () => void;
  isGenerating: boolean;
  progress: number;
  progressLabel: string;
  error?: string | null;
} & (
  | {
      draft: string;
      onDraftChange: (value: string) => void;
      creatorIntent?: never;
      onCreatorIntentChange?: never;
      generationMode?: never;
      onGenerationModeChange?: never;
    }
  | {
      draft?: never;
      onDraftChange?: never;
      creatorIntent: CustomWorldCreatorIntent;
      onCreatorIntentChange: (value: CustomWorldCreatorIntent) => void;
      generationMode: CustomWorldGenerationMode;
      onGenerationModeChange: (value: CustomWorldGenerationMode) => void;
    }
);

function hasCreatorIntentProps(
  props: CustomWorldCreatorModalProps,
): props is Extract<
  CustomWorldCreatorModalProps,
  { creatorIntent: CustomWorldCreatorIntent }
> {
  return 'creatorIntent' in props;
}

export function CustomWorldCreatorModal(props: CustomWorldCreatorModalProps) {
  const {
    isOpen,
    onClose,
    onSubmit,
    isGenerating,
    progress,
    progressLabel,
    error = null,
  } = props;

  const draftText = hasCreatorIntentProps(props)
    ? props.creatorIntent.rawSettingText
    : props.draft;

  const updateDraftText = (value: string) => {
    if (hasCreatorIntentProps(props)) {
      props.onCreatorIntentChange({
        ...props.creatorIntent,
        rawSettingText: value,
      });
      return;
    }

    props.onDraftChange(value);
  };

  return (
    <SelectionModal
      isOpen={isOpen}
      title="创建自定义世界"
      onClose={onClose}
      footer={(
        <>
          <PlatformActionButton
            surface="editorDark"
            tone="secondary"
            size="sm"
            onClick={onClose}
            disabled={isGenerating}
          >
            取消
          </PlatformActionButton>
          <PlatformActionButton
            surface="editorDark"
            tone="primary"
            size="sm"
            onClick={onSubmit}
            disabled={isGenerating}
          >
            {isGenerating ? '生成中...' : '开始生成'}
          </PlatformActionButton>
        </>
      )}
    >
      <div className="space-y-4">
        {hasCreatorIntentProps(props) ? (
          <label className="block">
            <div className="mb-2 text-sm font-medium text-zinc-200">生成模式</div>
            <PlatformSelectField
              value={props.generationMode}
              onChange={(event) =>
                props.onGenerationModeChange(
                  event.target.value as CustomWorldGenerationMode,
                )
              }
              surface="editorDark"
              tone="sky"
              density="roomy"
              className="rounded-2xl"
            >
              <option value="fast">快速</option>
              <option value="full">完整</option>
            </PlatformSelectField>
          </label>
        ) : null}

        <div className="text-sm leading-7 text-zinc-300">
          用几句话描述世界观、核心矛盾、时代气质和你想体验的叙事方向。系统会据此生成可游玩的自定义世界。
        </div>

        <PlatformTextField
          variant="textarea"
          value={draftText}
          onChange={(event) => updateDraftText(event.target.value)}
          rows={8}
          placeholder="例：一个被潮雾与失落列岛切碎的边境世界，旧盟约、沉船秘术与灯塔守望者纠缠在一起……"
          surface="editorDark"
          tone="sky"
          size="md"
          density="roomy"
          className="rounded-2xl leading-7"
        />

        {isGenerating ? (
          <PlatformStatusMessage
            tone="info"
            surface="editorDark"
            size="md"
            className="rounded-2xl"
          >
            <div className="mb-2 flex items-center justify-between text-xs tracking-[0.16em] text-sky-100/80">
              <span>{progressLabel}</span>
              <span>{Math.max(0, Math.min(100, Math.round(progress)))}%</span>
            </div>
            <PlatformProgressBar
              value={progress}
              minVisibleValue={6}
              ariaLabel="自定义世界生成进度"
              className="bg-white/10"
              fillClassName="bg-gradient-to-r from-sky-300 to-cyan-200"
            />
          </PlatformStatusMessage>
        ) : null}

        {error ? (
          <PlatformStatusMessage
            tone="error"
            surface="editorDark"
            size="md"
            className="rounded-2xl"
          >
            {error}
          </PlatformStatusMessage>
        ) : null}
      </div>
    </SelectionModal>
  );
}