package costmodel

import (
	"database/sql"
	"fmt"
	"time"

	"k8s.io/klog"

	costAnalyzerCloud "github.com/kubecost/cost-model/pkg/cloud"
	"github.com/kubecost/cost-model/pkg/env"
	"github.com/kubecost/cost-model/pkg/util"
	"github.com/kubecost/cost-model/pkg/util/json"

	_ "github.com/lib/pq"
)

func getPVCosts(db *sql.DB) (map[string]*costAnalyzerCloud.PV, error) {
	pvs := make(map[string]*costAnalyzerCloud.PV)
	query := `SELECT name, avg(value),labels->>'volumename' AS volumename, labels->>'cluster_id' AS clusterid
	FROM metrics
	WHERE (name='pv_hourly_cost')  AND value != 'NaN' AND value != 0
	GROUP BY volumename,name,clusterid;`
	rows, err := db.Query(query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	for rows.Next() {
		var (
			name       string
			avg        float64
			volumename string
			clusterid  string
		)
		if err := rows.Scan(&name, &avg, &volumename, &clusterid); err != nil {
			return nil, err
		}
		pvs[volumename] = &costAnalyzerCloud.PV{
			Cost: fmt.Sprintf("%f", avg),
		}
	}
	return pvs, nil
}

func getNodeCosts(db *sql.DB) (map[string]*costAnalyzerCloud.Node, error) {

	nodes := make(map[string]*costAnalyzerCloud.Node)

	query := `SELECT name, avg(value),labels->>'instance' AS instance, labels->>'cluster_id' AS clusterid
	FROM metrics
	WHERE (name='node_cpu_hourly_cost' OR name='node_ram_hourly_cost' OR name='node_gpu_hourly_cost')  AND value != 'NaN' AND value != 0
	GROUP BY instance,name,clusterid`
	rows, err := db.Query(query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	for rows.Next() {
		var (
			name      string
			avg       float64
			instance  string
			clusterid string
		)
		if err := rows.Scan(&name, &avg, &instance, &clusterid); err != nil {
			return nil, err
		}
		if data, ok := nodes[instance]; ok {
			if name == "node_cpu_hourly_cost" {
				data.VCPUCost = fmt.Sprintf("%f", avg)
			} else if name == "node_ram_hourly_cost" {
				data.RAMCost = fmt.Sprintf("%f", avg)
			} else if name == "node_gpu_hourly_cost" {
				data.GPUCost = fmt.Sprintf("%f", avg)
			}
		} else {
			nodes[instance] = &costAnalyzerCloud.Node{}
			data := nodes[instance]
			if name == "node_cpu_hourly_cost" {
				data.VCPUCost = fmt.Sprintf("%f", avg)
			} else if name == "node_ram_hourly_cost" {
				data.RAMCost = fmt.Sprintf("%f", avg)
			} else if name == "node_gpu_hourly_cost" {
				data.GPUCost = fmt.Sprintf("%f", avg)
			}
		}

	}

	return nodes, nil
}

func CostDataRangeFromSQL(field string, value string, window string, start string, end string) (map[string]*CostData, error) {
	pw := env.GetRemotePW()
	address := env.GetSQLAddress()
	connStr := fmt.Sprintf("postgres://postgres:%s@%s:5432?sslmode=disable", pw, address)
	db, err := sql.Open("postgres", connStr)
	defer db.Close()
	if err != nil {
		return nil, err
	}
	nodes, err := getNodeCosts(db)
	if err != nil {
		return nil, err
	}
	model := make(map[string]*CostData)
	query := `SELECT time_bucket($1, time) AS bucket, name, avg(value),labels->>'container' AS container,labels->>'pod' AS pod,labels->>'namespace' AS namespace, labels->>'instance' AS instance, labels->>'cluster_id' AS clusterid
	FROM metrics
	WHERE (name='container_cpu_allocation') AND
	  time > $2 AND time < $3 AND value != 'NaN'
	GROUP BY container,pod,bucket,namespace,instance,clusterid,name
	ORDER BY container,bucket;
	`
	rows, err := db.Query(query, window, start, end)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		var (
			bucket    string
			name      string
			sum       float64
			container string
			pod       string
			namespace string
			instance  string
			clusterid string
		)
		if err := rows.Scan(&bucket, &name, &sum, &container, &pod, &namespace, &instance, &clusterid); err != nil {
			return nil, err
		}
		layout := "2006-01-02T15:04:05Z"
		t, err := time.Parse(layout, bucket)
		if err != nil {
			return nil, err
		}

		k := NewContainerMetricFromValues(namespace, pod, container, instance, clusterid)
		key := k.Key()
		allocationVector := &util.Vector{
			Timestamp: float64(t.Unix()),
			Value:     sum,
		}
		if data, ok := model[key]; ok {
			if name == "container_cpu_allocation" {
				data.CPUAllocation = append(data.CPUAllocation, allocationVector)
			} else if name == "container_memory_allocation_bytes" {
				data.RAMAllocation = append(data.RAMAllocation, allocationVector)
			} else if name == "container_gpu_allocation" {
				data.GPUReq = append(data.GPUReq, allocationVector)
			}
		} else {
			node, ok := nodes[instance]
			if !ok {
				return nil, fmt.Errorf("No node found")
			}
			model[key] = &CostData{
				Name:          container,
				PodName:       pod,
				NodeName:      instance,
				NodeData:      node,
				CPUAllocation: []*util.Vector{},
				RAMAllocation: []*util.Vector{},
				GPUReq:        []*util.Vector{},
				Namespace:     namespace,
				ClusterID:     clusterid,
			}
			data := model[key]
			if name == "container_cpu_allocation" {
				data.CPUAllocation = append(data.CPUAllocation, allocationVector)
			} else if name == "container_memory_allocation_bytes" {
				data.RAMAllocation = append(data.RAMAllocation, allocationVector)
			} else if name == "container_gpu_allocation" {
				data.GPUReq = append(data.GPUReq, allocationVector)
			}
		}
	}
	query = `SELECT time_bucket($1, time) AS bucket, name, avg(value),labels->>'container' AS container,labels->>'pod' AS pod,labels->>'namespace' AS namespace, labels->>'instance' AS instance, labels->>'cluster_id' AS clusterid
	FROM metrics
	WHERE (name='container_memory_allocation_bytes') AND
		time > $2 AND time < $3 AND value != 'NaN'
	GROUP BY container,pod,bucket,namespace,instance,clusterid,name
	ORDER BY container,bucket;
	`
	rows, err = db.Query(query, window, start, end)
	if err != nil {
		return nil, err
	}
	for rows.Next() {
		var (
			bucket    string
			name      string
			sum       float64
			container string
			pod       string
			namespace string
			instance  string
			clusterid string
		)
		if err := rows.Scan(&bucket, &name, &sum, &container, &pod, &namespace, &instance, &clusterid); err != nil {
			return nil, err
		}
		layout := "2006-01-02T15:04:05Z"
		t, err := time.Parse(layout, bucket)
		if err != nil {
			return nil, err
		}

		k := NewContainerMetricFromValues(namespace, pod, container, instance, clusterid)
		key := k.Key()
		allocationVector := &util.Vector{
			Timestamp: float64(t.Unix()),
			Value:     sum,
		}
		if data, ok := model[key]; ok {
			if name == "container_cpu_allocation" {
				data.CPUAllocation = append(data.CPUAllocation, allocationVector)
			} else if name == "container_memory_allocation_bytes" {
				data.RAMAllocation = append(data.RAMAllocation, allocationVector)
			} else if name == "container_gpu_allocation" {
				data.GPUReq = append(data.GPUReq, allocationVector)
			}
		} else {
			node, ok := nodes[instance]
			if !ok {
				return nil, fmt.Errorf("No node found")
			}
			model[key] = &CostData{
				Name:          container,
				PodName:       pod,
				NodeName:      instance,
				NodeData:      node,
				CPUAllocation: []*util.Vector{},
				RAMAllocation: []*util.Vector{},
				GPUReq:        []*util.Vector{},
				Namespace:     namespace,
				ClusterID:     clusterid,
			}
			data := model[key]
			if name == "container_cpu_allocation" {
				data.CPUAllocation = append(data.CPUAllocation, allocationVector)
			} else if name == "container_memory_allocation_bytes" {
				data.RAMAllocation = append(data.RAMAllocation, allocationVector)
			} else if name == "container_gpu_allocation" {
				data.GPUReq = append(data.GPUReq, allocationVector)
			}
		}
	}
	query = `SELECT DISTINCT ON (labels->>'namespace') * FROM METRICS WHERE name='kube_namespace_labels' ORDER BY labels->>'namespace',time DESC;`
	rows, err = db.Query(query)
	if err != nil {
		return nil, err
	}
	cols, err := rows.Columns()
	if err != nil {
		return nil, err
	}
	rawResult := make([][]byte, len(cols))
	result := make([]string, len(cols))
	dest := make([]interface{}, len(cols)) // A temporary interface{} slice
	for i, _ := range rawResult {
		dest[i] = &rawResult[i] // Put pointers to each string in the interface slice
	}
	nsToLabels := make(map[string]map[string]string)
	for rows.Next() {
		err = rows.Scan(dest...)
		if err != nil {
			return nil, err
		}

		for i, raw := range rawResult {
			if raw == nil {
				result[i] = "\\N"
			} else {
				result[i] = string(raw)
			}
		}

		var dat map[string]string
		err := json.Unmarshal([]byte(result[4]), &dat)
		if err != nil {
			return nil, err
		}

		ns, ok := dat["namespace"]
		if !ok {
			return nil, fmt.Errorf("No namespace found")
		}
		nsToLabels[ns] = dat
	}

	for _, cd := range model {
		ns := cd.Namespace
		if labels, ok := nsToLabels[ns]; ok {
			cd.NamespaceLabels = labels
			cd.Labels = labels // TODO: override with podlabels
		}
	}

	volumes, err := getPVCosts(db)
	if err != nil {
		klog.Infof("Error fetching pv data from sql: %s. Skipping PVData", err.Error())
	} else {
		query = `SELECT time_bucket($1, time) AS bucket, name, avg(value), labels->>'persistentvolumeclaim' AS claim, labels->>'pod' AS pod,labels->>'namespace' AS namespace, labels->>'persistentvolume' AS volumename, labels->>'cluster_id' AS clusterid
		FROM metrics
		WHERE (name='pod_pvc_allocation') AND
			time > $2 AND time < $3 AND value != 'NaN'
		GROUP BY claim,pod,bucket,namespace,volumename,clusterid,name
		ORDER BY pod,bucket;`

		rows, err = db.Query(query, window, start, end)
		if err != nil {
			return nil, err
		}
		pvcData := make(map[string]*PersistentVolumeClaimData)
		for rows.Next() {
			var (
				bucket     string
				name       string
				sum        float64
				claim      string
				pod        string
				namespace  string
				volumename sql.NullString
				clusterid  string
			)
			if err := rows.Scan(&bucket, &name, &sum, &claim, &pod, &namespace, &volumename, &clusterid); err != nil {
				return nil, err
			}
			layout := "2006-01-02T15:04:05Z"
			t, err := time.Parse(layout, bucket)
			if err != nil {
				return nil, err
			}
			allocationVector := &util.Vector{
				Timestamp: float64(t.Unix()),
				Value:     sum,
			}
			if pvcd, ok := pvcData[claim]; ok {
				pvcd.Values = append(pvcd.Values, allocationVector)
			} else {
				if volumename.Valid {
					vname := volumename.String
					d := &PersistentVolumeClaimData{
						Namespace:  namespace,
						ClusterID:  clusterid,
						VolumeName: vname,
						Claim:      claim,
					}
					if volume, ok := volumes[vname]; ok {
						volume.Size = fmt.Sprintf("%f", sum) // Just assume the claim is the whole volume for now
						d.Volume = volume
					}
					d.Values = append(d.Values, allocationVector)
					pvcData[claim] = d
					for _, cd := range model { // TODO: make this not doubly nested
						if cd.PodName == pod && cd.Namespace == namespace {
							if len(cd.PVCData) > 0 {
								cd.PVCData = append(cd.PVCData, d)
							} else {
								cd.PVCData = []*PersistentVolumeClaimData{d}
							}
							break // break so we only assign to the first
						}
					}
				}

			}
		}
	}

	return model, nil
}