<template>
  <div class="welcome-screen">
    <!-- Logo 和标题 -->
    <div class="welcome-header">
      <h1 class="title">教研聊天助手</h1>
    </div>

    <!-- 功能卡片 -->
    <div class="feature-cards">
      <div
        v-for="feature in features"
        :key="feature.title"
        class="feature-card"
      >
        <div class="feature-icon" :style="{ background: feature.gradient }">
          <component :is="feature.icon" :size="22" />
        </div>
        <h3>{{ feature.title }}</h3>
        <p>{{ feature.description }}</p>
      </div>
    </div>

    <!-- 快速开始建议 -->
    <div class="quick-start">
      <h4>试试这些问题</h4>
      <div class="suggestions-grid">
        <button
          v-for="suggestion in suggestions"
          :key="suggestion.text"
          class="suggestion-card"
          @click="$emit('select', { id: suggestion.id, text: suggestion.text, systemPrompt: suggestion.systemPrompt })"
        >
          <component :is="suggestion.iconComponent" :size="18" class="suggestion-icon" />
          <span>{{ suggestion.text }}</span>
          <ChevronRight :size="16" class="arrow-icon" />
        </button>
      </div>
    </div>

    <!-- 底部提示 -->
    <div class="welcome-footer">
      <div class="tip">
        <Keyboard :size="14" />
        <span>按 <kbd>Ctrl</kbd> + <kbd>/</kbd> 聚焦输入框</span>
      </div>
      <div class="tip">
        <Zap :size="14" />
        <span>支持 Markdown、代码高亮、LaTeX 公式</span>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { computed } from "vue";
import {
  MessageSquare,
  Code,
  Image,
  FileText,
  ChevronRight,
  Keyboard,
  Zap,
  Globe,
  Lightbulb,
  PenTool,
} from "@/components/icons";
import promptData from "@/assets/prompt.json";
import type { Suggestion } from "@/types/chat";

defineEmits<{
  select: [suggestion: Suggestion];
}>();

const features = computed(() => [
  {
    icon: MessageSquare,
    title: "智能对话",
    description: "自然流畅的对话体验，理解上下文",
    gradient: "linear-gradient(135deg, #3b82f6 0%, #2563eb 100%)",
  },
  {
    icon: Code,
    title: "代码助手",
    description: "编写、解释、优化各种编程语言代码",
    gradient: "linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%)",
  },
  {
    icon: Image,
    title: "图像理解",
    description: "分析图片内容，提取关键信息",
    gradient: "linear-gradient(135deg, #ec4899 0%, #d946ef 100%)",
  },
  {
    icon: FileText,
    title: "文档处理",
    description: "阅读、总结、翻译各类文档",
    gradient: "linear-gradient(135deg, #f59e0b 0%, #f97316 100%)",
  },
]);

// 图标映射，根据文本内容选择合适的图标
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const iconMap: Record<string, any> = {
  学习: Lightbulb,
  调试: Code,
  写作: PenTool,
  语言: Globe,
  职业: Globe,
  学术: FileText,
};

const suggestions = computed(() => {
  // 内部类型，包含 icon 组件用于渲染
  type SuggestionWithIcon = Suggestion & { iconComponent: typeof Code };

  const allSuggestions: SuggestionWithIcon[] = [];

  // 遍历 prompt.json 的分类和条目
  for (const category of Object.values(promptData)) {
    for (const [text, systemPrompt] of Object.entries(category)) {
      // 根据文本关键词选择图标
      let iconComponent = Code; // 默认图标
      for (const [keyword, icon] of Object.entries(iconMap)) {
        if (text.includes(keyword)) {
          iconComponent = icon;
          break;
        }
      }
      allSuggestions.push({
        id: text,
        text,
        systemPrompt,
        iconComponent,
      });
    }
  }

  return allSuggestions;
});
</script>

<style lang="scss" scoped>
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding: 40px 24px;
  animation: fadeIn 0.5s ease;
}

.welcome-header {
  text-align: center;
  margin-bottom: 48px;
}

.logo-wrapper {
  position: relative;
  display: inline-flex;
  margin-bottom: 20px;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  border-radius: 24px;
  color: white;
  box-shadow: 0 20px 40px -12px rgba(59, 130, 246, 0.35);
}

.logo-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(
    circle,
    rgba(59, 130, 246, 0.2) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.title {
  margin: 0 0 12px;
  font-size: 32px;
  font-weight: 700;
  color: #1f2937;

  .dark & {
    color: #f3f4f6;
  }
}

.subtitle {
  margin: 0;
  font-size: 16px;
  color: #6b7280;

  .dark & {
    color: #9ca3af;
  }
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  width: 100%;
  margin-bottom: 48px;

  @media (max-width: 900px) {
    grid-template-columns: repeat(2, 1fr);
  }

  @media (max-width: 500px) {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: 24px;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  text-align: center;
  transition: all 0.3s ease;

  .dark & {
    background: #1e1e2e;
    border-color: #2d2d3d;
  }

  &:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.1);

    .dark & {
      box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.4);
    }
  }

  .feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    color: white;
    margin-bottom: 16px;
  }

  h3 {
    margin: 0 0 8px;
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;

    .dark & {
      color: #f3f4f6;
    }
  }

  p {
    margin: 0;
    font-size: 13px;
    color: #6b7280;
    line-height: 1.5;

    .dark & {
      color: #9ca3af;
    }
  }
}

.quick-start {
  max-width: 710px;
  width: 100%;
  margin-bottom: 40px;

  h4 {
    margin: 0 0 16px;
    font-size: 14px;
    font-weight: 600;
    color: #6b7280;
    text-align: center;

    .dark & {
      color: #9ca3af;
    }
  }
}

.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;

  @media (max-width: 600px) {
    grid-template-columns: 1fr;
  }
}

.suggestion-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  color: #374151;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;

  .dark & {
    background: #1e1e2e;
    border-color: #2d2d3d;
    color: #e5e7eb;
  }

  &:hover {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.05);

    .arrow-icon {
      transform: translateX(4px);
      color: #3b82f6;
    }
  }

  .suggestion-icon {
    flex-shrink: 0;
    color: #3b82f6;
  }

  span {
    flex: 1;
  }

  .arrow-icon {
    flex-shrink: 0;
    color: #9ca3af;
    transition: all 0.2s ease;
  }
}

.welcome-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.tip {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #9ca3af;

  kbd {
    padding: 2px 8px;
    background: #f3f4f6;
    border-radius: 4px;
    font-size: 12px;

    .dark & {
      background: #374151;
    }
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
</style>
