package transport

import (
	"errors"
	"io"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/geo-platform/tenant-api/internal/bootstrap"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/app"
)

type MonitoringCallbackHandler struct {
	svc *app.MonitoringCallbackService
}

func NewMonitoringCallbackHandler(a *bootstrap.App) *MonitoringCallbackHandler {
	return &MonitoringCallbackHandler{
		svc: app.NewMonitoringCallbackService(a.DB, a.MonitoringDB, a.RabbitMQ, a.LLM, a.Logger),
	}
}

func (h *MonitoringCallbackHandler) Heartbeat(c *gin.Context) {
	installationID, installationToken, ok := parseMonitoringInstallationHeaders(c)
	if !ok {
		return
	}

	var req app.MonitoringHeartbeatRequest
	if err := bindOptionalJSON(c, &req); err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_params", err.Error()))
		return
	}

	data, svcErr := h.svc.Heartbeat(c.Request.Context(), installationID, installationToken, req)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringCallbackHandler) LeaseTasks(c *gin.Context) {
	installationID, installationToken, ok := parseMonitoringInstallationHeaders(c)
	if !ok {
		return
	}

	var req app.MonitoringLeaseTasksRequest
	if err := bindOptionalJSON(c, &req); err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_params", err.Error()))
		return
	}

	data, svcErr := h.svc.LeaseTasks(c.Request.Context(), installationID, installationToken, req)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringCallbackHandler) ResumeTasks(c *gin.Context) {
	installationID, installationToken, ok := parseMonitoringInstallationHeaders(c)
	if !ok {
		return
	}

	var req app.MonitoringResumeTasksRequest
	if err := bindOptionalJSON(c, &req); err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_params", err.Error()))
		return
	}

	data, svcErr := h.svc.ResumeTasks(c.Request.Context(), installationID, installationToken, req)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringCallbackHandler) TaskResult(c *gin.Context) {
	taskID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_task_id", "task id must be a number"))
		return
	}

	installationID, installationToken, ok := parseMonitoringInstallationHeaders(c)
	if !ok {
		return
	}

	var req app.MonitoringTaskResultRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_params", err.Error()))
		return
	}

	data, svcErr := h.svc.HandleTaskResult(c.Request.Context(), installationID, installationToken, taskID, req)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func (h *MonitoringCallbackHandler) SkipTask(c *gin.Context) {
	taskID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_task_id", "task id must be a number"))
		return
	}

	installationID, installationToken, ok := parseMonitoringInstallationHeaders(c)
	if !ok {
		return
	}

	var req app.MonitoringSkipTaskRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40041, "invalid_params", err.Error()))
		return
	}

	data, svcErr := h.svc.SkipTask(c.Request.Context(), installationID, installationToken, taskID, req)
	if svcErr != nil {
		response.Error(c, svcErr)
		return
	}
	response.Success(c, data)
}

func parseMonitoringInstallationHeaders(c *gin.Context) (int64, string, bool) {
	installationID, err := strconv.ParseInt(c.GetHeader("X-Geo-Installation-Id"), 10, 64)
	if err != nil {
		response.Error(c, response.ErrUnauthorized(40141, "invalid_installation_id", "installation id header is invalid"))
		return 0, "", false
	}

	installationToken := c.GetHeader("X-Geo-Installation-Token")
	if installationToken == "" {
		response.Error(c, response.ErrUnauthorized(40141, "missing_installation_token", "installation token header is required"))
		return 0, "", false
	}

	return installationID, installationToken, true
}

func bindOptionalJSON(c *gin.Context, target interface{}) error {
	err := c.ShouldBindJSON(target)
	if err == nil {
		return nil
	}
	if errors.Is(err, io.EOF) {
		return nil
	}
	return err
}