package controller

import (
	"encoding/json"
	"net/http"
	"time"

	"ezops/model"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// LogHandler 日志监控处理器 // Logan.Li
type LogHandler struct {
	db *gorm.DB
}

func NewLogHandler(db *gorm.DB) *LogHandler {
	return &LogHandler{db: db}
}

// QueryLogs 查询日志条目（支持 level/service/host/keyword 过滤） // Logan.Li
func (h *LogHandler) QueryLogs(c *gin.Context) {
	var query model.PageQuery
	c.ShouldBindQuery(&query)

	db := h.db.Model(&model.LogEntry{})

	// 过滤
	if level := c.Query("level"); level != "" {
		db = db.Where("level = ?", level)
	}
	if service := c.Query("service"); service != "" {
		db = db.Where("service = ?", service)
	}
	if host := c.Query("host"); host != "" {
		db = db.Where("host = ?", host)
	}
	if kw := c.Query("keyword"); kw != "" {
		db = db.Where("message LIKE ?", "%"+kw+"%")
	}
	if sourceID := c.Query("source_id"); sourceID != "" {
		db = db.Where("source_id = ?", sourceID)
	}

	var total int64
	db.Count(&total)

	var logs []model.LogEntry
	db.Order("timestamp DESC").Offset(query.GetOffset()).Limit(query.GetLimit()).Find(&logs)

	c.JSON(http.StatusOK, model.Response{Code: 200, Data: model.ListResponse{List: logs, Total: total}})
}

// ListSources 获取日志源列表 // Logan.Li
func (h *LogHandler) ListSources(c *gin.Context) {
	var sources []model.LogSource
	h.db.Order("updated_at DESC").Find(&sources)
	c.JSON(http.StatusOK, model.Response{Code: 200, Data: model.ListResponse{List: sources, Total: int64(len(sources))}})
}

// CreateSource 创建日志源 // Logan.Li
func (h *LogHandler) CreateSource(c *gin.Context) {
	var req struct {
		Name   string                 `json:"name" binding:"required"`
		Type   string                 `json:"type" binding:"required"` // application/syslog/docker/kubernetes
		Config map[string]interface{} `json:"config"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: err.Error()})
		return
	}
	configJSON, _ := json.Marshal(req.Config)
	now := time.Now()
	item := model.LogSource{
		Name:   req.Name,
		Type:   req.Type,
		Status: "active",
		Config: string(configJSON),
		LastSeen: &now,
	}
	h.db.Create(&item)
	c.JSON(http.StatusOK, model.Response{Code: 200, Data: item})
}

// DeleteSource 删除日志源 // Logan.Li
func (h *LogHandler) DeleteSource(c *gin.Context) {
	if err := h.db.Delete(&model.LogSource{}, c.Param("id")); err.Error != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "删除失败"})
		return
	}
	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "已删除"})
}

// IngestLogs Agent 上报日志（无需 JWT，供 Agent 调用） // Logan.Li
func (h *LogHandler) IngestLogs(c *gin.Context) {
	var req struct {
		Source  string                   `json:"source"`
		Host    string                   `json:"host"`
		Service string                   `json:"service"`
		Entries []map[string]interface{} `json:"entries"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: err.Error()})
		return
	}

	// 查找或创建日志源
	var source model.LogSource
	h.db.Where("name = ?", req.Source).FirstOrCreate(&source, model.LogSource{
		Name: req.Source, Type: "agent", Status: "active",
	})

	count := 0
	for _, entry := range req.Entries {
		level, _ := entry["level"].(string)
		msg, _ := entry["message"].(string)
		raw, _ := entry["raw"].(string)
		traceID, _ := entry["trace_id"].(string)
		ts := time.Now()
		if t, ok := entry["timestamp"].(string); ok {
			if parsed, err := time.Parse(time.RFC3339, t); err == nil {
				ts = parsed
			}
		}

		log := model.LogEntry{
			SourceID:  source.ID,
			Timestamp: ts,
			Level:     level,
			Service:   req.Service,
			Host:      req.Host,
			Message:   msg,
			TraceID:   traceID,
			Raw:       raw,
		}
		if err := h.db.Create(&log); err.Error == nil {
			count++
		}
	}

	// 更新日志源统计
	now := time.Now()
	h.db.Model(&source).Updates(map[string]interface{}{
		"last_seen": &now,
	}).UpdateColumn("log_count", source.LogCount+int64(count))

	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "成功写入", Data: map[string]int{"count": count}})
}