package handlers

import (
	"context"
	"net/http"
	"time"

	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/backend/internal/repository"
	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/backend/internal/storage"
	"github.com/gin-gonic/gin"
)

type LogHandlers struct {
	LogRepo *repository.LogRepository
}

func NewLogHandlers(logRepo *repository.LogRepository) *LogHandlers {
	return &LogHandlers{LogRepo: logRepo}
}

type InsertLogRequest struct {
	Timestamp time.Time `json:"timestamp"`
	Level     string    `json:"level"     binding:"required"`
	Service   string    `json:"service"   binding:"required"`
	Agent     string    `json:"agent"     binding:"required"`
	Message   string    `json:"message"   binding:"required"`
}

// @Summary Insert log entry
// @Description Inserts a single log entry into ClickHouse
// @Tags logs
// @Accept json
// @Produce json
// @Param body body InsertLogRequest true "Log entry"
// @Success 201 {object} map[string]string
// @Security Bearer
// @Router /logs [post]
func (lh *LogHandlers) Insert(c *gin.Context) {
	var req InsertLogRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.Timestamp.IsZero() {
		req.Timestamp = time.Now()
	}

	log := storage.LogEntry{
		Timestamp: req.Timestamp,
		Level:     req.Level,
		Service:   req.Service,
		Agent:     req.Agent,
		Message:   req.Message,
	}

	if err := lh.LogRepo.Insert(c.Request.Context(), log); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to insert log"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{"status": "ok"})
}

type InsertLogsRequest struct {
	Logs []InsertLogRequest `json:"logs" binding:"required"`
}

// @Summary Insert log entries (batch)
// @Description Inserts multiple log entries into ClickHouse
// @Tags logs
// @Accept json
// @Produce json
// @Param body body InsertLogsRequest true "Log entries"
// @Success 201 {object} map[string]string
// @Security Bearer
// @Router /logs/batch [post]
func (lh *LogHandlers) InsertBatch(c *gin.Context) {
	var req InsertLogsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	logs := make([]storage.LogEntry, len(req.Logs))
	for i, l := range req.Logs {
		if l.Timestamp.IsZero() {
			l.Timestamp = time.Now()
		}
		logs[i] = storage.LogEntry{
			Timestamp: l.Timestamp,
			Level:     l.Level,
			Service:   l.Service,
			Agent:     l.Agent,
			Message:   l.Message,
		}
	}

	if err := lh.LogRepo.InsertBatch(c.Request.Context(), logs); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to insert logs"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{"status": "ok", "count": len(logs)})
}

type SearchLogsRequest struct {
	Level    string `form:"level"`
	Service  string `form:"service"`
	Agent    string `form:"agent"`
	DateFrom string `form:"date_from"`
	DateTo   string `form:"date_to"`
	Limit    int    `form:"limit"`
	Offset   int    `form:"offset"`
}

// @Summary Search logs
// @Description Searches logs with various filters
// @Tags logs
// @Produce json
// @Param level query string false "Log level (INFO, WARNING, ERROR, FATAL)"
// @Param service query string false "Service name"
// @Param agent query string false "Agent name"
// @Param date_from query string false "Date from (RFC3339)"
// @Param date_to query string false "Date to (RFC3339)"
// @Param limit query int false "Limit results" default(100)
// @Param offset query int false "Offset results" default(0)
// @Success 200 {array} storage.LogEntry
// @Security Bearer
// @Router /logs [get]
func (lh *LogHandlers) Search(c *gin.Context) {
	var req SearchLogsRequest
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	filter := repository.LogFilter{
		Level:   req.Level,
		Service: req.Service,
		Agent:   req.Agent,
		Limit:   req.Limit,
		Offset:  req.Offset,
	}

	if req.DateFrom != "" {
		if t, err := time.Parse(time.RFC3339, req.DateFrom); err == nil {
			filter.DateFrom = t
		}
	}

	if req.DateTo != "" {
		if t, err := time.Parse(time.RFC3339, req.DateTo); err == nil {
			filter.DateTo = t
		}
	}

	if filter.Limit <= 0 {
		filter.Limit = 100
	}

	logs, err := lh.LogRepo.Search(c.Request.Context(), filter)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to search logs"})
		return
	}

	c.JSON(http.StatusOK, logs)
}

// @Summary Get distinct services
// @Description Returns list of all unique service names in logs
// @Tags logs
// @Produce json
// @Success 200 {array} string
// @Security Bearer
// @Router /logs/services [get]
func (lh *LogHandlers) GetServices(c *gin.Context) {
	services, err := lh.LogRepo.GetDistinctServices(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get services"})
		return
	}

	if services == nil {
		services = []string{}
	}

	c.JSON(http.StatusOK, services)
}

// @Summary Get distinct agents
// @Description Returns list of all unique agent names in logs
// @Tags logs
// @Produce json
// @Success 200 {array} string
// @Security Bearer
// @Router /logs/agents [get]
func (lh *LogHandlers) GetAgents(c *gin.Context) {
	agents, err := lh.LogRepo.GetDistinctAgents(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get agents"})
		return
	}

	if agents == nil {
		agents = []string{}
	}

	c.JSON(http.StatusOK, agents)
}

// @Summary Get distinct log levels
// @Description Returns list of all unique log levels in logs
// @Tags logs
// @Produce json
// @Success 200 {array} string
// @Security Bearer
// @Router /logs/levels [get]
func (lh *LogHandlers) GetLevels(c *gin.Context) {
	levels, err := lh.LogRepo.GetDistinctLevels(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get levels"})
		return
	}

	if levels == nil {
		levels = []string{}
	}

	c.JSON(http.StatusOK, levels)
}

// Ensure context is used
var _ = context.Background