package handler

import (
	"net/http"
	"strconv"
	"time"

	"github.com/company/ai-ops/internal/domain/model"
	"github.com/company/ai-ops/internal/service"
	"github.com/company/ai-ops/pkg/errors"
	"github.com/company/ai-ops/pkg/response"
)

// LogHandler 是日志 HTTP 处理器
type LogHandler struct {
	service *service.LogService
}

func NewLogHandler(s *service.LogService) *LogHandler {
	return &LogHandler{service: s}
}

// RegisterRoutes 注册日志相关路由
func (h *LogHandler) RegisterRoutes(mux *http.ServeMux) {
	mux.HandleFunc("GET /api/v1/ai-ops/logs", h.QueryLogs)
	mux.HandleFunc("GET /api/v1/ai-ops/logs/export", h.ExportLogs)
}

// QueryLogs 日志查询
func (h *LogHandler) QueryLogs(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query()

	filter := model.LogQueryFilter{
		Service:    query.Get("service"),
		Path:       query.Get("path"),
		UserID:     query.Get("user_id"),
		SupplierID: query.Get("supplier_id"),
	}

	if startStr := query.Get("start"); startStr != "" {
		if t, err := time.Parse(time.RFC3339, startStr); err == nil {
			filter.StartTime = &t
		}
	}
	if endStr := query.Get("end"); endStr != "" {
		if t, err := time.Parse(time.RFC3339, endStr); err == nil {
			filter.EndTime = &t
		}
	}
	if codeStr := query.Get("status_code"); codeStr != "" {
		if code, err := strconv.Atoi(codeStr); err == nil {
			filter.StatusCode = &code
		}
	}
	if page, err := strconv.Atoi(query.Get("page")); err == nil && page > 0 {
		filter.Page = page
	} else {
		filter.Page = 1
	}
	if pageSize, err := strconv.Atoi(query.Get("page_size")); err == nil && pageSize > 0 && pageSize <= 100 {
		filter.PageSize = pageSize
	} else {
		filter.PageSize = 20
	}

	logs, total, err := h.service.QueryLogs(r.Context(), filter)
	if err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrInternal))
		return
	}

	response.PaginatedResponse(w, logs, total, filter.Page, filter.PageSize)
}

// ExportLogs 导出日志为 CSV
func (h *LogHandler) ExportLogs(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query()

	filter := model.LogQueryFilter{
		Service:    query.Get("service"),
		Path:       query.Get("path"),
		UserID:     query.Get("user_id"),
		SupplierID: query.Get("supplier_id"),
	}

	if startStr := query.Get("start"); startStr != "" {
		if t, err := time.Parse(time.RFC3339, startStr); err == nil {
			filter.StartTime = &t
		}
	}
	if endStr := query.Get("end"); endStr != "" {
		if t, err := time.Parse(time.RFC3339, endStr); err == nil {
			filter.EndTime = &t
		}
	}
	if codeStr := query.Get("status_code"); codeStr != "" {
		if code, err := strconv.Atoi(codeStr); err == nil {
			filter.StatusCode = &code
		}
	}

	w.Header().Set("Content-Type", "text/csv; charset=utf-8")
	w.Header().Set("Content-Disposition", "attachment; filename=logs_"+time.Now().Format("20060102_150405")+".csv")

	if err := h.service.ExportLogsCSV(r.Context(), filter, w); err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrInternal))
		return
	}
}