/**
 * 叙事剪辑 — 文案选择弹窗（#1970）
 * - 搜索框：防抖 300ms，命中文字黄色高亮
 * - 标签筛选行：全部/带货/工厂/测评/教程/口播/种草
 * - 数量统计 + 卡片列表（可滚动，max-height 420px）
 * - 调用 GET /api/v1/scripts?keyword=&tag=&page_size=200
 */
import React, { useState, useEffect, useMemo, useRef, useCallback } from "react"
import { Modal, Input, Tag, Spin } from "antd"
import { SearchOutlined, CheckCircleFilled } from "@ant-design/icons"
import { useQuery } from "@tanstack/react-query"
import { getScripts } from "@/api/scripts"
import type { ScriptItem } from "@/api/scripts"

interface ScriptSelectModalProps {
  open: boolean
  selectedScriptId: string | null
  onCancel: () => void
  onConfirm: (script: ScriptItem) => void
}

const SCRIPT_TABS = [
  { key: "all", label: "全部" },
  { key: "带货", label: "带货" },
  { key: "工厂", label: "工厂" },
  { key: "测评", label: "测评" },
  { key: "教程", label: "教程" },
  { key: "口播", label: "口播" },
  { key: "种草", label: "种草" },
]

/** 在文本中用 <mark> 高亮关键词（黄色背景） */
function highlight(text: string, keyword: string): React.ReactNode {
  if (!keyword) return text
  const idx = text.toLowerCase().indexOf(keyword.toLowerCase())
  if (idx < 0) return text
  return (
    <>
      {text.slice(0, idx)}
      <mark style={{ background: "#fef08a", color: "#713f12", padding: "0 2px", borderRadius: 2 }}>
        {text.slice(idx, idx + keyword.length)}
      </mark>
      {text.slice(idx + keyword.length)}
    </>
  )
}

const ScriptSelectModal: React.FC<ScriptSelectModalProps> = ({
  open,
  selectedScriptId,
  onCancel,
  onConfirm,
}) => {
  const [innerSelected, setInnerSelected] = useState<string | null>(selectedScriptId)
  const [activeTag, setActiveTag] = useState<string>("all")
  const [searchInput, setSearchInput] = useState("")
  const [debouncedKw, setDebouncedKw] = useState("")
  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null)

  useEffect(() => {
    if (open) {
      setInnerSelected(selectedScriptId)
      setActiveTag("all")
      setSearchInput("")
      setDebouncedKw("")
    }
  }, [open, selectedScriptId])

  // 300ms 防抖
  useEffect(() => {
    if (debounceRef.current) clearTimeout(debounceRef.current)
    debounceRef.current = setTimeout(() => setDebouncedKw(searchInput.trim()), 300)
    return () => {
      if (debounceRef.current) clearTimeout(debounceRef.current)
    }
  }, [searchInput])

  const { data, isLoading } = useQuery({
    queryKey: ["scripts", "select-modal", debouncedKw, activeTag],
    queryFn: () =>
      getScripts({
        page: 1,
        page_size: 200,
        keyword: debouncedKw || undefined,
        tag: activeTag === "all" ? undefined : activeTag,
      }),
    enabled: open,
  })

  const scripts: ScriptItem[] = useMemo(() => data?.items ?? [], [data])
  const selected = useMemo(
    () => scripts.find((s) => s.id === innerSelected) ?? null,
    [scripts, innerSelected],
  )

  const handleConfirm = useCallback(() => {
    if (selected) onConfirm(selected)
  }, [selected, onConfirm])

  return (
    <Modal
      title="📝 选择文案"
      open={open}
      onCancel={onCancel}
      onOk={handleConfirm}
      okText="确认选择"
      cancelText="取消"
      okButtonProps={{ disabled: !selected, style: { background: "#7c3aed" } }}
      width={680}
      destroyOnClose
    >
      {/* 搜索 */}
      <Input
        allowClear
        prefix={<SearchOutlined style={{ color: "#9ca3af" }} />}
        placeholder="搜索标题、内容或标签"
        value={searchInput}
        onChange={(e) => setSearchInput(e.target.value)}
        style={{ marginBottom: 12 }}
      />

      {/* 标签筛选 */}
      <div style={{ display: "flex", flexWrap: "wrap", gap: 8, marginBottom: 12 }}>
        {SCRIPT_TABS.map((t) => {
          const active = activeTag === t.key
          return (
            <Tag
              key={t.key}
              onClick={() => setActiveTag(t.key)}
              style={{
                cursor: "pointer",
                padding: "4px 14px",
                borderRadius: 16,
                border: active ? "1px solid #7c3aed" : "1px solid #e5e7eb",
                background: active ? "#ede9fe" : "#fff",
                color: active ? "#7c3aed" : "#4b5563",
                margin: 0,
                fontSize: 13,
              }}
            >
              {t.label}
            </Tag>
          )
        })}
      </div>

      {/* 数量统计 */}
      <div style={{ fontSize: 12, color: "#6b7280", marginBottom: 8 }}>
        共 {data?.total ?? scripts.length} 条文案
      </div>

      {/* 卡片列表 */}
      <div style={{ maxHeight: 420, overflowY: "auto", paddingRight: 4 }}>
        {isLoading ? (
          <div style={{ textAlign: "center", padding: "40px 0" }}>
            <Spin />
          </div>
        ) : scripts.length === 0 ? (
          <div style={{ textAlign: "center", padding: "40px 0", color: "#9ca3af" }}>
            暂无匹配文案
          </div>
        ) : (
          <div style={{ display: "flex", flexDirection: "column", gap: 10 }}>
            {scripts.map((s) => {
              const isSel = innerSelected === s.id
              const preview = (s.content || "").replace(/\s+/g, " ").slice(0, 80)
              return (
                <div
                  key={s.id}
                  onClick={() => setInnerSelected(s.id)}
                  style={{
                    padding: 14,
                    borderRadius: 8,
                    border: isSel ? "2px solid #7c3aed" : "1px solid #e5e7eb",
                    background: isSel ? "#faf5ff" : "#fff",
                    cursor: "pointer",
                    transition: "all 0.2s",
                    position: "relative",
                  }}
                >
                  {isSel && (
                    <CheckCircleFilled
                      style={{
                        position: "absolute",
                        top: 12,
                        right: 12,
                        color: "#7c3aed",
                        fontSize: 18,
                      }}
                    />
                  )}
                  <div
                    style={{
                      fontSize: 14,
                      fontWeight: 600,
                      color: isSel ? "#6d28d9" : "#111",
                      marginBottom: 4,
                      paddingRight: 24,
                    }}
                  >
                    {highlight(s.title || "未命名", debouncedKw)}
                  </div>
                  <div
                    style={{
                      fontSize: 12,
                      color: "#6b7280",
                      lineHeight: 1.6,
                      marginBottom: 8,
                    }}
                  >
                    {highlight(preview + ((s.content || "").length > 80 ? "..." : ""), debouncedKw)}
                  </div>
                  {s.tags && s.tags.length > 0 && (
                    <div style={{ display: "flex", gap: 4, flexWrap: "wrap" }}>
                      {s.tags.slice(0, 5).map((tg) => (
                        <Tag
                          key={tg}
                          style={{
                            margin: 0,
                            fontSize: 11,
                            padding: "1px 8px",
                            borderRadius: 10,
                            background: "#f3f4f6",
                            border: "none",
                            color: "#6b7280",
                          }}
                        >
                          {tg}
                        </Tag>
                      ))}
                    </div>
                  )}
                </div>
              )
            })}
          </div>
        )}
      </div>
    </Modal>
  )
}

export default ScriptSelectModal