package com.zy.ai.controller;

import com.baomidou.mybatisplus.mapper.EntityWrapper;
import com.core.annotations.ManagerAuth;
import com.core.common.R;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.zy.ai.entity.LlmRouteConfig;
import com.zy.ai.service.LlmRouteConfigService;
import com.zy.ai.service.LlmRoutingService;
import com.zy.common.web.BaseController;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

@Slf4j
@RestController
@RequestMapping("/ai/llm/config")
@RequiredArgsConstructor
public class LlmRouteConfigController extends BaseController {

    private final LlmRouteConfigService llmRouteConfigService;
    private final LlmRoutingService llmRoutingService;
    private final ObjectMapper objectMapper;

    @GetMapping("/list/auth")
    @ManagerAuth
    public R list() {
        EntityWrapper<LlmRouteConfig> wrapper = new EntityWrapper<>();
        wrapper.orderBy("priority", true).orderBy("id", true);
        List<LlmRouteConfig> list = llmRouteConfigService.selectList(wrapper);
        return R.ok(list);
    }

    @PostMapping("/save/auth")
    @ManagerAuth
    public R save(@RequestBody LlmRouteConfig config) {
        if (config == null) {
            return R.error("参数不能为空");
        }

        if (isBlank(config.getBaseUrl()) || isBlank(config.getApiKey()) || isBlank(config.getModel())) {
            return R.error("必须填写 baseUrl/apiKey/model");
        }

        if (config.getId() == null) {
            llmRoutingService.fillAndNormalize(config, true);
            llmRouteConfigService.insert(config);
        } else {
            LlmRouteConfig db = llmRouteConfigService.selectById(config.getId());
            if (db == null) {
                return R.error("配置不存在");
            }
            // 保留统计字段，避免前端误覆盖
            Integer failCount = db.getFailCount();
            Integer successCount = db.getSuccessCount();
            Integer consecutiveFailCount = db.getConsecutiveFailCount();
            Date lastFailTime = db.getLastFailTime();
            Date lastUsedTime = db.getLastUsedTime();
            String lastError = db.getLastError();

            llmRoutingService.fillAndNormalize(config, false);
            config.setFailCount(failCount);
            config.setSuccessCount(successCount);
            config.setConsecutiveFailCount(consecutiveFailCount);
            config.setLastFailTime(lastFailTime);
            config.setLastUsedTime(lastUsedTime);
            config.setLastError(lastError);
            config.setCreateTime(db.getCreateTime());
            llmRouteConfigService.updateById(config);
        }

        llmRoutingService.evictCache();
        return R.ok(config);
    }

    @PostMapping("/delete/auth")
    @ManagerAuth
    public R delete(@RequestParam("id") Long id) {
        if (id == null) {
            return R.error("id不能为空");
        }
        llmRouteConfigService.deleteById(id);
        llmRoutingService.evictCache();
        return R.ok();
    }

    @PostMapping("/clearCooldown/auth")
    @ManagerAuth
    public R clearCooldown(@RequestParam("id") Long id) {
        if (id == null) {
            return R.error("id不能为空");
        }
        LlmRouteConfig cfg = llmRouteConfigService.selectById(id);
        if (cfg == null) {
            return R.error("配置不存在");
        }
        cfg.setCooldownUntil(null);
        cfg.setConsecutiveFailCount(0);
        cfg.setUpdateTime(new Date());
        llmRouteConfigService.updateById(cfg);
        llmRoutingService.evictCache();
        return R.ok();
    }

    @PostMapping("/test/auth")
    @ManagerAuth
    public R test(@RequestBody LlmRouteConfig config) {
        if (config == null) {
            return R.error("参数不能为空");
        }
        if (isBlank(config.getBaseUrl()) || isBlank(config.getApiKey()) || isBlank(config.getModel())) {
            return R.error("测试失败：必须填写 baseUrl/apiKey/model");
        }
        Map<String, Object> data = llmRoutingService.testRoute(config);
        if (Boolean.TRUE.equals(data.get("ok")) && config.getId() != null) {
            LlmRouteConfig db = llmRouteConfigService.selectById(config.getId());
            if (db != null) {
                db.setCooldownUntil(null);
                db.setConsecutiveFailCount(0);
                db.setUpdateTime(new Date());
                llmRouteConfigService.updateById(db);
                llmRoutingService.evictCache();
            }
        }
        return R.ok(data);
    }

    @GetMapping("/export/auth")
    @ManagerAuth
    public R exportConfig() {
        EntityWrapper<LlmRouteConfig> wrapper = new EntityWrapper<>();
        wrapper.orderBy("priority", true).orderBy("id", true);
        List<LlmRouteConfig> list = llmRouteConfigService.selectList(wrapper);
        List<Map<String, Object>> routes = new ArrayList<>();
        if (list != null) {
            for (LlmRouteConfig cfg : list) {
                routes.add(exportRow(cfg));
            }
        }
        HashMap<String, Object> result = new HashMap<>();
        result.put("version", "1.0");
        result.put("exportTime", new Date());
        result.put("count", routes.size());
        result.put("routes", routes);
        return R.ok(result);
    }

    @PostMapping("/import/auth")
    @ManagerAuth
    @Transactional(rollbackFor = Exception.class)
    public R importConfig(@RequestBody Object body) {
        boolean replace = false;
        List<?> rawRoutes = null;

        if (body instanceof Map) {
            Map<?, ?> map = (Map<?, ?>) body;
            replace = parseBoolean(map.get("replace"));
            Object routesObj = map.get("routes");
            if (routesObj instanceof List) {
                rawRoutes = (List<?>) routesObj;
            }
        } else if (body instanceof List) {
            rawRoutes = (List<?>) body;
        }

        if (rawRoutes == null || rawRoutes.isEmpty()) {
            return R.error("导入数据为空或格式不正确，必须包含 routes 数组");
        }

        int inserted = 0;
        int updated = 0;
        int skipped = 0;
        List<String> errors = new ArrayList<>();
        List<LlmRouteConfig> validRoutes = new ArrayList<>();

        for (int i = 0; i < rawRoutes.size(); i++) {
            Object row = rawRoutes.get(i);
            LlmRouteConfig cfg;
            try {
                cfg = objectMapper.convertValue(row, LlmRouteConfig.class);
            } catch (Exception e) {
                skipped++;
                errors.add("第" + (i + 1) + "条解析失败: " + safeMsg(e.getMessage()));
                continue;
            }
            if (cfg == null) {
                skipped++;
                errors.add("第" + (i + 1) + "条为空");
                continue;
            }

            cfg.setName(trim(cfg.getName()));
            cfg.setBaseUrl(trim(cfg.getBaseUrl()));
            cfg.setApiKey(trim(cfg.getApiKey()));
            cfg.setModel(trim(cfg.getModel()));
            cfg.setMemo(trim(cfg.getMemo()));
            if (isBlank(cfg.getBaseUrl()) || isBlank(cfg.getApiKey()) || isBlank(cfg.getModel())) {
                skipped++;
                errors.add("第" + (i + 1) + "条缺少必填字段 baseUrl/apiKey/model");
                continue;
            }
            validRoutes.add(cfg);
        }

        if (validRoutes.isEmpty()) {
            String firstError = errors.isEmpty() ? "" : ("，首条原因：" + errors.get(0));
            return R.error("导入失败：没有可用配置" + firstError);
        }

        if (replace) {
            llmRouteConfigService.delete(new EntityWrapper<LlmRouteConfig>());
        }

        HashMap<Long, LlmRouteConfig> dbById = new HashMap<>();
        if (!replace) {
            List<LlmRouteConfig> current = llmRouteConfigService.selectList(new EntityWrapper<>());
            if (current != null) {
                for (LlmRouteConfig item : current) {
                    if (item != null && item.getId() != null) {
                        dbById.put(item.getId(), item);
                    }
                }
            }
        }

        for (LlmRouteConfig cfg : validRoutes) {

            if (!replace && cfg.getId() != null && dbById.containsKey(cfg.getId())) {
                LlmRouteConfig db = dbById.get(cfg.getId());
                Long keepId = db.getId();
                Date createTime = db.getCreateTime();
                Integer failCount = db.getFailCount();
                Integer successCount = db.getSuccessCount();
                Integer consecutiveFailCount = db.getConsecutiveFailCount();
                Date lastFailTime = db.getLastFailTime();
                Date lastUsedTime = db.getLastUsedTime();
                String lastError = db.getLastError();
                Date cooldownUntil = db.getCooldownUntil();

                llmRoutingService.fillAndNormalize(cfg, false);
                cfg.setId(keepId);
                cfg.setCreateTime(createTime);
                cfg.setFailCount(failCount);
                cfg.setSuccessCount(successCount);
                cfg.setConsecutiveFailCount(consecutiveFailCount);
                cfg.setLastFailTime(lastFailTime);
                cfg.setLastUsedTime(lastUsedTime);
                cfg.setLastError(lastError);
                cfg.setCooldownUntil(cooldownUntil);
                llmRouteConfigService.updateById(cfg);
                updated++;
                continue;
            }

            cfg.setId(null);
            cfg.setCooldownUntil(null);
            cfg.setFailCount(0);
            cfg.setSuccessCount(0);
            cfg.setConsecutiveFailCount(0);
            cfg.setLastFailTime(null);
            cfg.setLastUsedTime(null);
            cfg.setLastError(null);
            llmRoutingService.fillAndNormalize(cfg, true);
            llmRouteConfigService.insert(cfg);
            inserted++;
        }

        llmRoutingService.evictCache();

        HashMap<String, Object> result = new HashMap<>();
        result.put("replace", replace);
        result.put("total", rawRoutes.size());
        result.put("inserted", inserted);
        result.put("updated", updated);
        result.put("skipped", skipped);
        result.put("errorCount", errors.size());
        if (!errors.isEmpty()) {
            int max = Math.min(errors.size(), 20);
            result.put("errors", errors.subList(0, max));
        }
        log.info("LLM路由导入完成, replace={}, total={}, inserted={}, updated={}, skipped={}",
                replace, rawRoutes.size(), inserted, updated, skipped);
        return R.ok(result);
    }

    private Map<String, Object> exportRow(LlmRouteConfig cfg) {
        LinkedHashMap<String, Object> row = new LinkedHashMap<>();
        row.put("id", cfg.getId());
        row.put("name", cfg.getName());
        row.put("baseUrl", cfg.getBaseUrl());
        row.put("apiKey", cfg.getApiKey());
        row.put("model", cfg.getModel());
        row.put("thinking", cfg.getThinking());
        row.put("priority", cfg.getPriority());
        row.put("status", cfg.getStatus());
        row.put("switchOnQuota", cfg.getSwitchOnQuota());
        row.put("switchOnError", cfg.getSwitchOnError());
        row.put("cooldownSeconds", cfg.getCooldownSeconds());
        row.put("memo", cfg.getMemo());
        return row;
    }

    private boolean parseBoolean(Object x) {
        if (x instanceof Boolean) return (Boolean) x;
        if (x == null) return false;
        String s = String.valueOf(x).trim();
        return "1".equals(s) || "true".equalsIgnoreCase(s) || "yes".equalsIgnoreCase(s);
    }

    private String trim(String s) {
        return s == null ? null : s.trim();
    }

    private String safeMsg(String s) {
        if (s == null) return "";
        return s.length() > 200 ? s.substring(0, 200) : s;
    }

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