package com.zy.ai.service;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.zy.ai.entity.ChatCompletionRequest;
import com.zy.ai.entity.ChatCompletionResponse;
import com.zy.ai.entity.LlmCallLog;
import com.zy.ai.entity.LlmRouteConfig;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Flux;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Consumer;

@Slf4j
@Service
@RequiredArgsConstructor
public class LlmChatService {

    private static final int LOG_TEXT_LIMIT = 16000;

    private final LlmRoutingService llmRoutingService;
    private final LlmCallLogService llmCallLogService;

    @Value("${llm.base-url:}")
    private String fallbackBaseUrl;

    @Value("${llm.api-key:}")
    private String fallbackApiKey;

    @Value("${llm.model:}")
    private String fallbackModel;

    @Value("${llm.thinking:false}")
    private String fallbackThinking;

    /**
     * 通用对话方法：传入 messages，返回大模型文本回复
     */
    public String chat(List<ChatCompletionRequest.Message> messages,
                       Double temperature,
                       Integer maxTokens) {

        ChatCompletionRequest req = new ChatCompletionRequest();
        req.setMessages(messages);
        req.setTemperature(temperature != null ? temperature : 0.3);
        req.setMax_tokens(maxTokens != null ? maxTokens : 1024);
        req.setStream(false);

        ChatCompletionResponse response = complete(req, "chat");

        if (response == null ||
                response.getChoices() == null ||
                response.getChoices().isEmpty() ||
                response.getChoices().get(0).getMessage() == null ||
                response.getChoices().get(0).getMessage().getContent() == null ||
                response.getChoices().get(0).getMessage().getContent().isEmpty()) {
            return null;
        }

        return response.getChoices().get(0).getMessage().getContent();
    }

    public ChatCompletionResponse chatCompletion(List<ChatCompletionRequest.Message> messages,
                                                 Double temperature,
                                                 Integer maxTokens,
                                                 List<Object> tools) {
        ChatCompletionRequest req = new ChatCompletionRequest();
        req.setMessages(messages);
        req.setTemperature(temperature != null ? temperature : 0.3);
        req.setMax_tokens(maxTokens != null ? maxTokens : 1024);
        req.setStream(false);
        if (tools != null && !tools.isEmpty()) {
            req.setTools(tools);
            req.setTool_choice("auto");
        }
        return complete(req, tools != null && !tools.isEmpty() ? "chat_completion_tools" : "chat_completion");
    }

    public ChatCompletionResponse complete(ChatCompletionRequest req) {
        return complete(req, "completion");
    }

    private ChatCompletionResponse complete(ChatCompletionRequest req, String scene) {
        String traceId = nextTraceId();
        List<ResolvedRoute> routes = resolveRoutes();
        if (routes.isEmpty()) {
            log.error("调用 LLM 失败: 未配置可用 LLM 路由");
            recordCall(traceId, scene, false, 1, null, false, null, 0L, req, null, "none",
                    new RuntimeException("未配置可用 LLM 路由"), "no_route");
            return null;
        }

        Throwable last = null;
        for (int i = 0; i < routes.size(); i++) {
            ResolvedRoute route = routes.get(i);
            boolean hasNext = i < routes.size() - 1;
            ChatCompletionRequest routeReq = applyRoute(cloneRequest(req), route, false);
            long start = System.currentTimeMillis();
            try {
                CompletionCallResult callResult = callCompletion(route, routeReq);
                ChatCompletionResponse resp = callResult.response;
                if (!isValidCompletion(resp)) {
                    RuntimeException ex = new RuntimeException("LLM 响应为空");
                    boolean canSwitch = shouldSwitch(route, false);
                    markFailure(route, ex, canSwitch);
                    recordCall(traceId, scene, false, i + 1, route, false, callResult.statusCode,
                            System.currentTimeMillis() - start, routeReq, callResult.payload, "error", ex,
                            "invalid_completion");
                    if (hasNext && canSwitch) {
                        log.warn("LLM 切换到下一路由, current={}, reason={}", route.tag(), ex.getMessage());
                        continue;
                    }
                    log.error("调用 LLM 失败, route={}", route.tag(), ex);
                    last = ex;
                    break;
                }
                markSuccess(route);
                recordCall(traceId, scene, false, i + 1, route, true, callResult.statusCode,
                        System.currentTimeMillis() - start, routeReq, buildResponseText(resp, callResult.payload),
                        "none", null, null);
                return resp;
            } catch (Throwable ex) {
                last = ex;
                boolean quota = isQuotaExhausted(ex);
                boolean canSwitch = shouldSwitch(route, quota);
                markFailure(route, ex, canSwitch);
                recordCall(traceId, scene, false, i + 1, route, false, statusCodeOf(ex),
                        System.currentTimeMillis() - start, routeReq, responseBodyOf(ex),
                        quota ? "quota" : "error", ex, null);
                if (hasNext && canSwitch) {
                    log.warn("LLM 切换到下一路由, current={}, reason={}", route.tag(), errorText(ex));
                    continue;
                }
                log.error("调用 LLM 失败, route={}", route.tag(), ex);
                break;
            }
        }

        if (last != null) {
            log.error("调用 LLM 全部路由失败: {}", errorText(last));
        }
        return null;
    }

    public void chatStream(List<ChatCompletionRequest.Message> messages,
                           Double temperature,
                           Integer maxTokens,
                           Consumer<String> onChunk,
                           Runnable onComplete,
                           Consumer<Throwable> onError) {

        ChatCompletionRequest req = new ChatCompletionRequest();
        req.setMessages(messages);
        req.setTemperature(temperature != null ? temperature : 0.3);
        req.setMax_tokens(maxTokens != null ? maxTokens : 1024);
        req.setStream(true);

        streamWithFailover(req, onChunk, onComplete, onError, "chat_stream");
    }

    public void chatStreamWithTools(List<ChatCompletionRequest.Message> messages,
                                    Double temperature,
                                    Integer maxTokens,
                                    List<Object> tools,
                                    Consumer<String> onChunk,
                                    Runnable onComplete,
                                    Consumer<Throwable> onError) {
        ChatCompletionRequest req = new ChatCompletionRequest();
        req.setMessages(messages);
        req.setTemperature(temperature != null ? temperature : 0.3);
        req.setMax_tokens(maxTokens != null ? maxTokens : 1024);
        req.setStream(true);
        if (tools != null && !tools.isEmpty()) {
            req.setTools(tools);
            req.setTool_choice("auto");
        }
        streamWithFailover(req, onChunk, onComplete, onError, tools != null && !tools.isEmpty() ? "chat_stream_tools" : "chat_stream");
    }

    private void streamWithFailover(ChatCompletionRequest req,
                                    Consumer<String> onChunk,
                                    Runnable onComplete,
                                    Consumer<Throwable> onError,
                                    String scene) {
        String traceId = nextTraceId();
        List<ResolvedRoute> routes = resolveRoutes();
        if (routes.isEmpty()) {
            recordCall(traceId, scene, true, 1, null, false, null, 0L, req, null, "none",
                    new RuntimeException("未配置可用 LLM 路由"), "no_route");
            if (onError != null) onError.accept(new RuntimeException("未配置可用 LLM 路由"));
            return;
        }
        attemptStream(routes, 0, req, onChunk, onComplete, onError, traceId, scene);
    }

    private void attemptStream(List<ResolvedRoute> routes,
                               int index,
                               ChatCompletionRequest req,
                               Consumer<String> onChunk,
                               Runnable onComplete,
                               Consumer<Throwable> onError,
                               String traceId,
                               String scene) {
        if (index >= routes.size()) {
            if (onError != null) onError.accept(new RuntimeException("LLM 路由全部失败"));
            return;
        }

        ResolvedRoute route = routes.get(index);
        ChatCompletionRequest routeReq = applyRoute(cloneRequest(req), route, true);
        long start = System.currentTimeMillis();
        StringBuilder outputBuffer = new StringBuilder();

        AtomicBoolean doneSeen = new AtomicBoolean(false);
        AtomicBoolean errorSeen = new AtomicBoolean(false);
        AtomicBoolean emitted = new AtomicBoolean(false);
        LinkedBlockingQueue<String> queue = new LinkedBlockingQueue<>();

        Thread drain = new Thread(() -> {
            try {
                while (true) {
                    String s = queue.poll(2, TimeUnit.SECONDS);
                    if (s != null) {
                        emitted.set(true);
                        try {
                            onChunk.accept(s);
                        } catch (Exception ignore) {
                        }
                    }
                    if (doneSeen.get() && queue.isEmpty()) {
                        if (!errorSeen.get()) {
                            try {
                                if (onComplete != null) onComplete.run();
                            } catch (Exception ignore) {
                            }
                        }
                        break;
                    }
                }
            } catch (InterruptedException ignore) {
            }
        });
        drain.setDaemon(true);
        drain.start();

        streamFlux(route, routeReq).subscribe(payload -> {
            if (payload == null || payload.isEmpty()) return;
            String[] events = payload.split("\\r?\\n\\r?\\n");
            for (String part : events) {
                String s = part;
                if (s == null || s.isEmpty()) continue;
                if (s.startsWith("data:")) {
                    s = s.substring(5);
                    if (s.startsWith(" ")) s = s.substring(1);
                }
                if ("[DONE]".equals(s.trim())) {
                    doneSeen.set(true);
                    continue;
                }
                try {
                    JSONObject obj = JSON.parseObject(s);
                    JSONArray choices = obj.getJSONArray("choices");
                    if (choices != null && !choices.isEmpty()) {
                        JSONObject c0 = choices.getJSONObject(0);
                        JSONObject delta = c0.getJSONObject("delta");
                        if (delta != null) {
                            String content = delta.getString("content");
                            if (content != null) {
                                queue.offer(content);
                                appendLimited(outputBuffer, content);
                            }
                        }
                    }
                } catch (Exception e) {
                    log.warn("解析 LLM stream 片段失败: {}", e.getMessage());
                }
            }
        }, err -> {
            errorSeen.set(true);
            doneSeen.set(true);
            boolean quota = isQuotaExhausted(err);
            boolean canSwitch = shouldSwitch(route, quota);
            markFailure(route, err, canSwitch);
            recordCall(traceId, scene, true, index + 1, route, false, statusCodeOf(err),
                    System.currentTimeMillis() - start, routeReq, outputBuffer.toString(),
                    quota ? "quota" : "error", err, "emitted=" + emitted.get());
            if (!emitted.get() && canSwitch && index < routes.size() - 1) {
                log.warn("LLM 路由失败，自动切换，current={}, reason={}", route.tag(), errorText(err));
                attemptStream(routes, index + 1, req, onChunk, onComplete, onError, traceId, scene);
                return;
            }
            if (onError != null) onError.accept(err);
        }, () -> {
            if (!doneSeen.get()) {
                RuntimeException ex = new RuntimeException("LLM 流意外完成");
                errorSeen.set(true);
                doneSeen.set(true);
                boolean canSwitch = shouldSwitch(route, false);
                markFailure(route, ex, canSwitch);
                recordCall(traceId, scene, true, index + 1, route, false, 200,
                        System.currentTimeMillis() - start, routeReq, outputBuffer.toString(),
                        "error", ex, "unexpected_stream_end");
                if (!emitted.get() && canSwitch && index < routes.size() - 1) {
                    log.warn("LLM 路由流异常完成，自动切换，current={}", route.tag());
                    attemptStream(routes, index + 1, req, onChunk, onComplete, onError, traceId, scene);
                } else {
                    if (onError != null) onError.accept(ex);
                }
            } else {
                markSuccess(route);
                recordCall(traceId, scene, true, index + 1, route, true, 200,
                        System.currentTimeMillis() - start, routeReq, outputBuffer.toString(),
                        "none", null, null);
                doneSeen.set(true);
            }
        });
    }

    private Flux<String> streamFlux(ResolvedRoute route, ChatCompletionRequest req) {
        WebClient client = WebClient.builder().baseUrl(route.baseUrl).build();
        return client.post()
                .uri("/chat/completions")
                .header(HttpHeaders.AUTHORIZATION, "Bearer " + route.apiKey)
                .contentType(MediaType.APPLICATION_JSON)
                .accept(MediaType.TEXT_EVENT_STREAM)
                .bodyValue(req)
                .exchangeToFlux(resp -> {
                    int status = resp.rawStatusCode();
                    if (status >= 200 && status < 300) {
                        return resp.bodyToFlux(String.class);
                    }
                    return resp.bodyToMono(String.class)
                            .defaultIfEmpty("")
                            .flatMapMany(body -> Flux.error(new LlmRouteException(status, body)));
                })
                .doOnError(ex -> log.error("调用 LLM 流式失败, route={}", route.tag(), ex));
    }

    private CompletionCallResult callCompletion(ResolvedRoute route, ChatCompletionRequest req) {
        WebClient client = WebClient.builder().baseUrl(route.baseUrl).build();
        RawCompletionResult raw = client.post()
                .uri("/chat/completions")
                .header(HttpHeaders.AUTHORIZATION, "Bearer " + route.apiKey)
                .contentType(MediaType.APPLICATION_JSON)
                .accept(MediaType.APPLICATION_JSON, MediaType.TEXT_EVENT_STREAM)
                .bodyValue(req)
                .exchangeToMono(resp -> resp.bodyToFlux(String.class)
                        .collectList()
                        .map(list -> new RawCompletionResult(resp.rawStatusCode(), String.join("\\n\\n", list))))
                .block();

        if (raw == null) {
            throw new RuntimeException("LLM 返回为空");
        }
        if (raw.statusCode < 200 || raw.statusCode >= 300) {
            throw new LlmRouteException(raw.statusCode, raw.payload);
        }
        return new CompletionCallResult(raw.statusCode, raw.payload, parseCompletion(raw.payload));
    }

    private ChatCompletionRequest applyRoute(ChatCompletionRequest req, ResolvedRoute route, boolean stream) {
        req.setModel(route.model);
        req.setStream(stream);
        if (route.thinkingEnabled) {
            ChatCompletionRequest.Thinking t = new ChatCompletionRequest.Thinking();
            t.setType("enable");
            req.setThinking(t);
        } else {
            req.setThinking(null);
        }
        return req;
    }

    private ChatCompletionRequest cloneRequest(ChatCompletionRequest src) {
        ChatCompletionRequest req = new ChatCompletionRequest();
        req.setModel(src.getModel());
        req.setMessages(src.getMessages());
        req.setTemperature(src.getTemperature());
        req.setMax_tokens(src.getMax_tokens());
        req.setStream(src.getStream());
        req.setTools(src.getTools());
        req.setTool_choice(src.getTool_choice());
        req.setThinking(src.getThinking());
        return req;
    }

    private boolean isValidCompletion(ChatCompletionResponse response) {
        if (response == null || response.getChoices() == null || response.getChoices().isEmpty()) {
            return false;
        }
        ChatCompletionRequest.Message message = response.getChoices().get(0).getMessage();
        if (message == null) {
            return false;
        }
        if (!isBlank(message.getContent())) {
            return true;
        }
        return message.getTool_calls() != null && !message.getTool_calls().isEmpty();
    }

    private boolean shouldSwitch(ResolvedRoute route, boolean quota) {
        return quota ? route.switchOnQuota : route.switchOnError;
    }

    private void markSuccess(ResolvedRoute route) {
        if (route.id != null) {
            llmRoutingService.markSuccess(route.id);
        }
    }

    private void markFailure(ResolvedRoute route, Throwable ex, boolean enterCooldown) {
        if (route.id != null) {
            llmRoutingService.markFailure(route.id, errorText(ex), enterCooldown, route.cooldownSeconds);
        }
    }

    private String errorText(Throwable ex) {
        if (ex == null) return "unknown";
        if (ex instanceof LlmRouteException) {
            LlmRouteException e = (LlmRouteException) ex;
            String body = e.body == null ? "" : e.body;
            if (body.length() > 240) {
                body = body.substring(0, 240);
            }
            return "status=" + e.statusCode + ", body=" + body;
        }
        return ex.getMessage() == null ? ex.toString() : ex.getMessage();
    }

    private boolean isQuotaExhausted(Throwable ex) {
        if (!(ex instanceof LlmRouteException)) return false;
        LlmRouteException e = (LlmRouteException) ex;
        if (e.statusCode == 429) return true;
        String text = (e.body == null ? "" : e.body).toLowerCase();
        return text.contains("insufficient_quota")
                || text.contains("quota")
                || text.contains("余额")
                || text.contains("用量")
                || text.contains("超限")
                || text.contains("rate limit");
    }

    private List<ResolvedRoute> resolveRoutes() {
        List<ResolvedRoute> routes = new ArrayList<>();
        List<LlmRouteConfig> dbRoutes = llmRoutingService.listAvailableRoutes();
        for (LlmRouteConfig c : dbRoutes) {
            routes.add(ResolvedRoute.fromDb(c));
        }
        // 兼容：数据库为空时，回退到 yml
        if (routes.isEmpty() && !isBlank(fallbackBaseUrl) && !isBlank(fallbackApiKey) && !isBlank(fallbackModel)) {
            routes.add(ResolvedRoute.fromFallback(fallbackBaseUrl, fallbackApiKey, fallbackModel, isFallbackThinkingEnabled()));
        }
        return routes;
    }

    private boolean isFallbackThinkingEnabled() {
        String x = fallbackThinking == null ? "" : fallbackThinking.trim().toLowerCase();
        return "true".equals(x) || "1".equals(x) || "enable".equals(x);
    }

    private boolean isBlank(String s) {
        return s == null || s.trim().isEmpty();
    }

    private ChatCompletionResponse mergeSseChunk(ChatCompletionResponse acc, String payload) {
        if (payload == null || payload.isEmpty()) return acc;
        String[] events = payload.split("\\r?\\n\\r?\\n");
        for (String part : events) {
            String s = part;
            if (s == null || s.isEmpty()) continue;
            if (s.startsWith("data:")) {
                s = s.substring(5);
                if (s.startsWith(" ")) s = s.substring(1);
            }
            if ("[DONE]".equals(s.trim())) {
                continue;
            }
            try {
                JSONObject obj = JSON.parseObject(s);
                if (obj == null) continue;
                JSONArray choices = obj.getJSONArray("choices");
                if (choices != null && !choices.isEmpty()) {
                    JSONObject c0 = choices.getJSONObject(0);
                    if (acc.getChoices() == null || acc.getChoices().isEmpty()) {
                        ChatCompletionResponse.Choice choice = new ChatCompletionResponse.Choice();
                        ChatCompletionRequest.Message msg = new ChatCompletionRequest.Message();
                        choice.setMessage(msg);
                        ArrayList<ChatCompletionResponse.Choice> list = new ArrayList<>();
                        list.add(choice);
                        acc.setChoices(list);
                    }
                    ChatCompletionResponse.Choice choice = acc.getChoices().get(0);
                    ChatCompletionRequest.Message msg = choice.getMessage();
                    if (msg.getRole() == null || msg.getRole().isEmpty()) {
                        msg.setRole("assistant");
                    }
                    JSONObject delta = c0.getJSONObject("delta");
                    if (delta != null) {
                        String c = delta.getString("content");
                        if (c != null) {
                            String prev = msg.getContent();
                            msg.setContent(prev == null ? c : prev + c);
                        }
                        String role = delta.getString("role");
                        if (role != null && !role.isEmpty()) msg.setRole(role);
                    }
                    JSONObject message = c0.getJSONObject("message");
                    if (message != null) {
                        String c = message.getString("content");
                        if (c != null) {
                            String prev = msg.getContent();
                            msg.setContent(prev == null ? c : prev + c);
                        }
                        String role = message.getString("role");
                        if (role != null && !role.isEmpty()) msg.setRole(role);
                    }
                    String fr = c0.getString("finish_reason");
                    if (fr != null && !fr.isEmpty()) choice.setFinishReason(fr);
                }
                String id = obj.getString("id");
                if (id != null && !id.isEmpty()) acc.setId(id);
                Long created = obj.getLong("created");
                if (created != null) acc.setCreated(created);
                String object = obj.getString("object");
                if (object != null && !object.isEmpty()) acc.setObjectName(object);
            } catch (Exception ignore) {
            }
        }
        return acc;
    }

    private ChatCompletionResponse parseCompletion(String payload) {
        if (payload == null) return null;
        try {
            ChatCompletionResponse r = JSON.parseObject(payload, ChatCompletionResponse.class);
            if (r != null && r.getChoices() != null && !r.getChoices().isEmpty() && r.getChoices().get(0).getMessage() != null) {
                return r;
            }
        } catch (Exception ignore) {
        }
        ChatCompletionResponse sse = mergeSseChunk(new ChatCompletionResponse(), payload);
        if (sse.getChoices() != null && !sse.getChoices().isEmpty() && sse.getChoices().get(0).getMessage() != null && sse.getChoices().get(0).getMessage().getContent() != null) {
            return sse;
        }
        ChatCompletionResponse r = new ChatCompletionResponse();
        ChatCompletionResponse.Choice choice = new ChatCompletionResponse.Choice();
        ChatCompletionRequest.Message msg = new ChatCompletionRequest.Message();
        msg.setRole("assistant");
        msg.setContent(payload);
        choice.setMessage(msg);
        ArrayList<ChatCompletionResponse.Choice> list = new ArrayList<>();
        list.add(choice);
        r.setChoices(list);
        return r;
    }

    private String nextTraceId() {
        return UUID.randomUUID().toString().replace("-", "");
    }

    private void appendLimited(StringBuilder sb, String text) {
        if (sb == null || text == null || text.isEmpty()) {
            return;
        }
        int remain = LOG_TEXT_LIMIT - sb.length();
        if (remain <= 0) {
            return;
        }
        if (text.length() <= remain) {
            sb.append(text);
        } else {
            sb.append(text, 0, remain);
        }
    }

    private Integer statusCodeOf(Throwable ex) {
        if (ex instanceof LlmRouteException) {
            return ((LlmRouteException) ex).statusCode;
        }
        return null;
    }

    private String responseBodyOf(Throwable ex) {
        if (ex instanceof LlmRouteException) {
            return cut(((LlmRouteException) ex).body, LOG_TEXT_LIMIT);
        }
        return null;
    }

    private String buildResponseText(ChatCompletionResponse resp, String fallbackPayload) {
        if (resp != null && resp.getChoices() != null && !resp.getChoices().isEmpty()
                && resp.getChoices().get(0) != null && resp.getChoices().get(0).getMessage() != null) {
            ChatCompletionRequest.Message m = resp.getChoices().get(0).getMessage();
            if (!isBlank(m.getContent())) {
                return cut(m.getContent(), LOG_TEXT_LIMIT);
            }
            if (m.getTool_calls() != null && !m.getTool_calls().isEmpty()) {
                return cut(JSON.toJSONString(m), LOG_TEXT_LIMIT);
            }
        }
        return cut(fallbackPayload, LOG_TEXT_LIMIT);
    }

    private String safeName(Throwable ex) {
        return ex == null ? null : ex.getClass().getSimpleName();
    }

    private String cut(String text, int maxLen) {
        if (text == null) return null;
        String clean = text.replace("\r", " ");
        return clean.length() > maxLen ? clean.substring(0, maxLen) : clean;
    }

    private void recordCall(String traceId,
                            String scene,
                            boolean stream,
                            int attemptNo,
                            ResolvedRoute route,
                            boolean success,
                            Integer httpStatus,
                            long latencyMs,
                            ChatCompletionRequest req,
                            String response,
                            String switchMode,
                            Throwable err,
                            String extra) {
        LlmCallLog item = new LlmCallLog();
        item.setTraceId(cut(traceId, 64));
        item.setScene(cut(scene, 64));
        item.setStream((short) (stream ? 1 : 0));
        item.setAttemptNo(attemptNo);
        if (route != null) {
            item.setRouteId(route.id);
            item.setRouteName(cut(route.name, 128));
            item.setBaseUrl(cut(route.baseUrl, 255));
            item.setModel(cut(route.model, 128));
        }
        item.setSuccess((short) (success ? 1 : 0));
        item.setHttpStatus(httpStatus);
        item.setLatencyMs(latencyMs < 0 ? 0 : latencyMs);
        item.setSwitchMode(cut(switchMode, 32));
        item.setRequestContent(cut(JSON.toJSONString(req), LOG_TEXT_LIMIT));
        item.setResponseContent(cut(response, LOG_TEXT_LIMIT));
        item.setErrorType(cut(safeName(err), 128));
        item.setErrorMessage(err == null ? null : cut(errorText(err), 1024));
        item.setExtra(cut(extra, 512));
        item.setCreateTime(new Date());
        llmCallLogService.saveIgnoreError(item);
    }

    private static class CompletionCallResult {
        private final int statusCode;
        private final String payload;
        private final ChatCompletionResponse response;

        private CompletionCallResult(int statusCode, String payload, ChatCompletionResponse response) {
            this.statusCode = statusCode;
            this.payload = payload;
            this.response = response;
        }
    }

    private static class RawCompletionResult {
        private final int statusCode;
        private final String payload;

        private RawCompletionResult(int statusCode, String payload) {
            this.statusCode = statusCode;
            this.payload = payload;
        }
    }

    private static class LlmRouteException extends RuntimeException {
        private final int statusCode;
        private final String body;

        private LlmRouteException(int statusCode, String body) {
            super("http status=" + statusCode);
            this.statusCode = statusCode;
            this.body = body;
        }
    }

    private static class ResolvedRoute {
        private Long id;
        private String name;
        private String baseUrl;
        private String apiKey;
        private String model;
        private boolean thinkingEnabled;
        private boolean switchOnQuota;
        private boolean switchOnError;
        private Integer cooldownSeconds;

        private static ResolvedRoute fromDb(LlmRouteConfig c) {
            ResolvedRoute r = new ResolvedRoute();
            r.id = c.getId();
            r.name = c.getName();
            r.baseUrl = c.getBaseUrl();
            r.apiKey = c.getApiKey();
            r.model = c.getModel();
            r.thinkingEnabled = c.getThinking() != null && c.getThinking() == 1;
            r.switchOnQuota = c.getSwitchOnQuota() == null || c.getSwitchOnQuota() == 1;
            r.switchOnError = c.getSwitchOnError() == null || c.getSwitchOnError() == 1;
            r.cooldownSeconds = c.getCooldownSeconds();
            return r;
        }

        private static ResolvedRoute fromFallback(String baseUrl, String apiKey, String model, boolean thinkingEnabled) {
            ResolvedRoute r = new ResolvedRoute();
            r.name = "fallback-yml";
            r.baseUrl = baseUrl;
            r.apiKey = apiKey;
            r.model = model;
            r.thinkingEnabled = thinkingEnabled;
            r.switchOnQuota = true;
            r.switchOnError = true;
            r.cooldownSeconds = 300;
            return r;
        }

        private String tag() {
            String showName = name == null ? "unnamed" : name;
            String showModel = model == null ? "" : (" model=" + model);
            return showName + showModel;
        }
    }
}