import {useEffect,useRef,useState,type FormEvent} from "react"
import {ScreeningRunControl} from "./ScreeningRunControl"
import {StockHistoryChart} from "./StockHistoryChart"
import {Plus,RefreshCw} from "lucide-react"
import {Button} from "./ui/button"
import {Input} from "./ui/input"
import {Badge} from "./ui/badge"
import {Card,CardContent,CardHeader,CardTitle,CardDescription} from "./ui/card"
import {ApiError} from "@/lib/auth"
import {actOnCandidate,getCandidate,getCandidates,saveDraft,states,type Candidate,type CandidateContent} from "@/lib/candidates"
const control="w-full rounded-md border bg-background px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-ring"
const actions:Record<string,string>={submit:"提交审核",publish:"审核发布",return:"退回修订",withdraw:"撤回发布"}
const localTime=(date:Date)=>new Date(date.getTime()-date.getTimezoneOffset()*60000).toISOString().slice(0,16)
function blank():CandidateContent{return {symbol:"",exchange:"SSE",name:"",strategy_code:"trend_following",title:"",thesis:"",evidence:[{source_url:"",locator:"",summary:""}],counter_evidence:"",invalidation:"",reference_plan:{entry_low:"",entry_high:"",stop_loss:"",target_price:""}}}
export function CandidatesPanel({onSessionExpired,initialCandidateID}:{onSessionExpired:()=>void;initialCandidateID?:string}){
 const [list,setList]=useState<Candidate[]>([]),[selected,setSelected]=useState<Candidate|null>(null),[status,setStatus]=useState("")
 const [error,setError]=useState(""),[busy,setBusy]=useState(false),[loading,setLoading]=useState(false),[editing,setEditing]=useState(false),[source,setSource]=useState<Candidate|undefined>()
 const [content,setContent]=useState<CandidateContent>(blank),[observed,setObserved]=useState(()=>localTime(new Date())),[until,setUntil]=useState(()=>localTime(new Date(Date.now()+86400000)))
 const [action,setAction]=useState(""),[reason,setReason]=useState("")
 const controller=useRef<AbortController|null>(null),detailController=useRef<AbortController|null>(null)
 function failed(e:unknown){if(e instanceof ApiError&&e.status===401)onSessionExpired();else setError(e instanceof Error?e.message:"操作失败，请重试。")}
 async function refresh(){controller.current?.abort();const next=new AbortController();controller.current=next;setLoading(true);try{const result=await getCandidates(next.signal,status);if(!next.signal.aborted){setList(result);setError("")}}catch(e){if(!next.signal.aborted)failed(e)}finally{if(!next.signal.aborted)setLoading(false)}}
 useEffect(()=>{void refresh();return()=>{controller.current?.abort();detailController.current?.abort()}},[status])
 useEffect(()=>{if(!initialCandidateID)return;const c=new AbortController();getCandidate(initialCandidateID,c.signal).then(result=>{if(!c.signal.aborted)setSelected(result)}).catch(e=>{if(!c.signal.aborted)failed(e)});return()=>c.abort()},[initialCandidateID])
 async function select(c:Candidate){detailController.current?.abort();const next=new AbortController();detailController.current=next;setSelected(null);setAction("");setEditing(false);try{const detail=await getCandidate(c.id,next.signal);if(!next.signal.aborted)setSelected(detail)}catch(e){if(!next.signal.aborted)failed(e)}}
 function edit(c?:Candidate){setSource(c);setContent(c?structuredClone(c.content):blank());setObserved(localTime(new Date()));setUntil(localTime(new Date(Date.now()+86400000)));setEditing(true);setAction("");setError("")}
 async function save(e:FormEvent){e.preventDefault();setBusy(true);setError("");try{const result=await saveDraft({content,observed_at:new Date(observed).toISOString(),valid_until:new Date(until).toISOString()},source);setEditing(false);await refresh();await select(result)}catch(e){failed(e)}finally{setBusy(false)}}
 async function confirm(e:FormEvent){e.preventDefault();if(!selected)return;setBusy(true);setError("");try{const result=await actOnCandidate(selected,action,reason);setAction("");setReason("");await refresh();await select(result)}catch(e){failed(e)}finally{setBusy(false)}}
 const set=(key:keyof CandidateContent,value:string)=>setContent(c=>({...c,[key]:value}))
 return <div className="space-y-6">
 <ScreeningRunControl onSessionExpired={onSessionExpired} onCompleted={()=>void refresh()}/>
  <div className="flex flex-wrap items-center justify-between gap-3"><div className="flex items-center gap-3"><Badge variant="outline">模拟候选</Badge><p className="text-sm text-muted-foreground">自动筛选形成队列，审核股票依据后发布。</p></div><div className="flex gap-2"><Button variant="outline" disabled={busy||loading} onClick={()=>void refresh()}><RefreshCw/>刷新</Button><Button variant="ghost" disabled={busy} onClick={()=>edit()}><Plus/>手工补录</Button></div></div>
  {error&&<p role="alert" className="rounded-lg border border-destructive/30 p-4 text-sm text-destructive">{error}</p>}
  {editing&&<Card><CardHeader><CardTitle>{source?`创建第 ${source.revision+1} 次修订` : "录入观察候选"}</CardTitle><CardDescription>原修订保留。证据、反证与参考价格需完整填写；此表单为手工录入；自动筛选结果从策略中心进入待审核。</CardDescription></CardHeader><CardContent><form onSubmit={e=>void save(e)} className="space-y-5"><div className="grid gap-4 sm:grid-cols-3">{([["证券代码","symbol"],["证券名称","name"],["候选标题","title"]] as const).map(([label,key])=><label key={key} className="space-y-2 text-sm"><span>{label}</span><Input required value={content[key]} onChange={e=>set(key,e.target.value)} maxLength={key==="symbol"?6:120}/></label>)}<label className="space-y-2 text-sm">交易所<select className={control} value={content.exchange} onChange={e=>set("exchange",e.target.value)}><option value="SSE">上交所</option><option value="SZSE">深交所</option></select></label><label className="space-y-2 text-sm">研究方法<select className={control} value={content.strategy_code} onChange={e=>set("strategy_code",e.target.value)}><option value="trend_following">趋势观察</option><option value="pullback">回调观察</option><option value="event_driven">事件观察</option></select></label><label className="space-y-2 text-sm">观察时间<Input type="datetime-local" required value={observed} onChange={e=>setObserved(e.target.value)}/></label><label className="space-y-2 text-sm">有效截止<Input type="datetime-local" required value={until} onChange={e=>setUntil(e.target.value)}/></label></div>
   {([["观察逻辑","thesis"],["反证与风险","counter_evidence"],["失效条件","invalidation"]] as const).map(([label,key])=><label key={key} className="block space-y-2 text-sm"><span>{label}</span><textarea className={control} rows={3} required maxLength={key==="thesis"?2000:1000} value={content[key]} onChange={e=>set(key,e.target.value)}/></label>)}
   <div className="space-y-3"><h3 className="text-sm font-medium">证据来源</h3>{content.evidence.map((evidence,i)=><div key={i} className="grid gap-3 rounded-lg border p-4 sm:grid-cols-2">{([["来源 HTTPS 链接","source_url"],["页码 / 段落 / 标题","locator"],["证据摘要","summary"]] as const).map(([label,key])=><label className="space-y-2 text-sm" key={key}><span>{label}</span><Input required type={key==="source_url"?"url":"text"} value={evidence[key]} onChange={e=>setContent(c=>({...c,evidence:c.evidence.map((item,index)=>index===i?{...item,[key]:e.target.value}:item)}))}/></label>)}{content.evidence.length>1&&<Button type="button" variant="ghost" onClick={()=>setContent(c=>({...c,evidence:c.evidence.filter((_,index)=>index!==i)}))}>移除此证据</Button>}</div>)}<Button type="button" variant="outline" disabled={content.evidence.length>=8} onClick={()=>setContent(c=>({...c,evidence:[...c.evidence,{source_url:"",locator:"",summary:""}]}))}>添加证据</Button></div>
   <div className="grid gap-4 sm:grid-cols-4">{([["参考区间下限","entry_low"],["参考区间上限","entry_high"],["风险价格","stop_loss"],["目标观察价格","target_price"]] as const).map(([label,key])=><label className="space-y-2 text-sm" key={key}><span>{label}</span><Input required inputMode="decimal" value={content.reference_plan[key]} onChange={e=>setContent(c=>({...c,reference_plan:{...c.reference_plan,[key]:e.target.value}}))}/></label>)}</div><p className="text-xs text-muted-foreground">金额最多两位小数；风险价格 &lt; 下限 ≤ 上限 &lt; 目标价格。观察时间限最近 24 小时，有效期最长 7 天。</p><div className="flex gap-3"><Button disabled={busy} type="submit">{busy?"保存中":"保存新草稿"}</Button><Button type="button" variant="outline" disabled={busy} onClick={()=>setEditing(false)}>取消</Button></div></form></CardContent></Card>}
  <div className="grid items-start gap-6 xl:grid-cols-[.9fr_1.3fr]"><Card><CardHeader><div className="flex items-center justify-between"><CardTitle>候选队列</CardTitle><select aria-label="候选状态" className={`${control} max-w-32`} value={status} onChange={e=>setStatus(e.target.value)}><option value="">全部状态</option>{Object.entries(states).map(([key,label])=><option key={key} value={key}>{label}</option>)}</select></div><CardDescription>最近 100 条最新修订及当前发布版本。</CardDescription></CardHeader><CardContent className="space-y-2">{loading&&<p className="text-sm text-muted-foreground">正在读取…</p>}{!loading&&list.length===0&&<p className="py-8 text-center text-sm text-muted-foreground">尚无符合此状态的股票候选。点击上方自动筛选，命中结果会进入待审核；无需手工录入。</p>}{list.map(c=><button disabled={busy} key={c.id} onClick={()=>void select(c)} className={`w-full rounded-lg border p-4 text-left transition hover:bg-muted ${selected?.id===c.id?"border-primary bg-accent/40":""}`}><div className="flex items-center justify-between gap-2"><strong className="text-lg">{c.content.name}</strong><Badge variant="outline">{states[c.status]}</Badge></div><p className="mt-1 font-mono text-xs text-muted-foreground">{c.content.exchange} · {c.content.symbol}</p><div className="my-3 flex items-end gap-2"><span className="text-xs text-muted-foreground">参考区间</span><strong className="font-mono text-xl">¥{c.content.reference_plan.entry_low}–{c.content.reference_plan.entry_high}</strong></div><p className="text-xs text-muted-foreground">风险 ¥{c.content.reference_plan.stop_loss} · 目标观察 ¥{c.content.reference_plan.target_price}</p><p className="mt-3 text-sm">{c.content.title}</p><p className="mt-2 text-xs text-muted-foreground">修订 {c.revision} · 版本 {c.version} · {c.is_active_publication?"当前有效发布":c.status==="PUBLISHED"?"已过期或被替代":"模拟研究"}</p></button>)}</CardContent></Card>
  <Card><CardHeader><CardTitle>{selected?`${selected.content.name} · ${selected.content.symbol}`:"股票依据与审核"}</CardTitle><CardDescription>{selected?`${selected.content.name} ${selected.content.exchange}:${selected.content.symbol} · 修订 ${selected.revision}`:"选择候选查看依据与审核记录。"}</CardDescription></CardHeader><CardContent className="space-y-5">{selected&&<><StockHistoryChart symbol={selected.content.symbol} exchange={selected.content.exchange} onSessionExpired={onSessionExpired}/><div className="flex flex-wrap gap-2"><Badge>{states[selected.status]}</Badge><Badge variant="outline">模拟候选</Badge><Badge variant="outline">版本 {selected.version}</Badge></div>{selected.screening&&<div className="rounded-lg border p-4 text-sm leading-7"><strong>自动日线筛选</strong><br/>{selected.screening.strategy_name} · 修订 {selected.screening.strategy_revision}<br/>日线 {selected.screening.bar_date} · {selected.screening.source_adapter} 配置版本 {selected.screening.source_version}<p className="break-all text-xs text-muted-foreground">输入摘要 {selected.screening.input_hash}</p></div>}<p className="text-xs text-muted-foreground">观察 {new Date(selected.observed_at).toLocaleString("zh-CN")} · 有效截止 {new Date(selected.valid_until).toLocaleString("zh-CN")}</p>{([["观察逻辑",selected.content.thesis],["反证与风险",selected.content.counter_evidence],["失效条件",selected.content.invalidation]]).map(([label,value])=><section key={label}><h3 className="mb-2 text-sm font-semibold">{label}</h3><p className="whitespace-pre-wrap text-sm leading-7 text-muted-foreground">{value}</p></section>)}<section><h3 className="mb-3 text-sm font-semibold">证据</h3>{selected.content.evidence.map((e,i)=><div key={i} className="mb-3 rounded-lg bg-muted p-4 text-sm"><a href={e.source_url} target="_blank" rel="noopener noreferrer" className="break-all text-primary underline">{e.locator}</a><p className="mt-2 whitespace-pre-wrap leading-6">{e.summary}</p></div>)}</section><div className="rounded-lg border p-4 text-sm leading-7">参考区间 ¥{selected.content.reference_plan.entry_low}–{selected.content.reference_plan.entry_high}<br/>风险价格 ¥{selected.content.reference_plan.stop_loss} · 目标观察 ¥{selected.content.reference_plan.target_price}</div>
   <div className="flex flex-wrap gap-2">{selected.is_latest&&selected.status!=="PENDING_REVIEW"&&<Button variant="outline" disabled={busy} onClick={()=>edit(selected)}>创建新修订</Button>}{(selected.is_latest&&selected.status==="DRAFT"?["submit"]:selected.is_latest&&selected.status==="PENDING_REVIEW"?["publish","return"]:selected.is_active_publication?["withdraw"]:[]).map(a=><Button key={a} disabled={busy} variant={a==="publish"?"default":"outline"} onClick={()=>{setAction(a);setReason("")}}>{actions[a]}</Button>)}</div>
   {action&&<form onSubmit={e=>void confirm(e)} className="space-y-3 rounded-lg border border-primary/30 p-4"><p className="text-sm font-semibold">确认{actions[action]}：{selected.content.name}，修订 {selected.revision}，版本 {selected.version}</p><p className="text-xs text-muted-foreground">{action==="publish"?"发布后 App 可读取此模拟候选；旧发布版本将被替代。":action==="withdraw"?"撤回后此版本从有效候选列表移除，历史链接仍显示失效状态。":"此操作会写入不可覆盖的审核记录。"}</p><textarea required maxLength={1000} aria-label="审核意见" placeholder="填写具体理由或审核意见" rows={3} className={control} value={reason} onChange={e=>setReason(e.target.value)}/><div className="flex gap-2"><Button disabled={busy||!reason.trim()} type="submit">{busy?"提交中":"确认"}</Button><Button disabled={busy} type="button" variant="ghost" onClick={()=>setAction("")}>取消</Button></div></form>}
   <section><h3 className="mb-3 text-sm font-semibold">审核记录</h3>{selected.reviews?.length?selected.reviews.map(r=><div key={r.id} className="border-t py-3 text-sm"><strong>{actions[r.decision.toLowerCase()]??r.decision}</strong><span className="ml-3 text-xs text-muted-foreground">{new Date(r.created_at).toLocaleString("zh-CN")} · 输入版本 {r.input_version}</span><p className="mt-2 whitespace-pre-wrap text-muted-foreground">{r.reason}</p></div>):<p className="text-sm text-muted-foreground">尚无审核记录。</p>}</section></>}</CardContent></Card></div>
 </div>
}