package client

import (
	"fmt"
	"path"
	"strings"
)

// Node from data
type Node struct {
	ID       int `json:"id"`
	ImageURL string
	Max      string
	Min      string
	Text     string
	Value    string
	Children []Node
}

// Visitor callback function
type Visitor func(v Value) error

// IsValue true if node has children
func (n *Node) IsValue() bool {
	if n.Children == nil {
		return false
	}
	return len(n.Children) == 0
}

// IsRoot returns true if json is a root node
func (n *Node) IsRoot() bool {
	return n.ID == 0
}

// IsSensor returns true if json node is for a sensor type
func (n *Node) IsSensor() bool {
	if n.ImageURL == "" || n.Text == "" {
		return false
	}
	_, ok := sensorToType[n.Text]
	return ok
}

// SensorType returns type of sensor
func (n *Node) SensorType() Sensor {
	st, _ := sensorToType[n.Text]
	// Figure out if data is in GB (Data) or MB (SmallData)
	if st == Data {
		if len(n.Children) > 0 {
			val := n.Children[0]
			if strings.HasSuffix(val.Value, "MB") {
				st = SmallData
			}
		}
	}
	return st
}

// IsHardware returns true if json node is for hardware
func (n *Node) IsHardware() bool {
	if n.ImageURL == "" || n.Text == "" {
		return false
	}
	_, ok := imageToHardware[path.Base(n.ImageURL)]
	return ok
}

// HardwareType returns HardwareType of node
func (n *Node) HardwareType() HardwareType {
	ht, _ := imageToHardware[path.Base(n.ImageURL)]
	return ht
}

// Values from json root
func (n *Node) Values() ([]Value, error) {
	ret := []Value{}
	err := n.Walk(func(val Value) error {
		ret = append(ret, val)
		return nil
	})
	if err != nil {
		return nil, err
	}
	return ret, nil
}

// Walk from json root
func (n *Node) Walk(fn Visitor) error {
	return n.walk(fn, Value{Hardware: []Hardware{}}, 0, 0)
}

func (n *Node) walk(fn Visitor, ctx Value, hwIndex, hwTotal int) error {
	if n.IsValue() {
		ctx.Label = n.Text
		ctx.Value = n.Value
		return fn(ctx)
	}
	if n.IsSensor() {
		ctx.Unit = n.SensorType()
	}
	if n.IsHardware() {
		ctx.Hardware = append(ctx.Hardware, Hardware{
			Type:      n.HardwareType(),
			Value:     n.Text,
			TypeIndex: hwIndex,
			TypeCount: hwTotal,
		})
	}
	totals := n.childDeviceTotals()
	deviceIndex := map[HardwareType]int{}
	for _, child := range n.Children {
		deviceType := child.HardwareType()
		index := deviceIndex[deviceType]
		if err := child.walk(fn, ctx, index, totals[deviceType]); err != nil {
			return err
		}
		deviceIndex[deviceType]++
	}
	return nil
}

func (n *Node) childDeviceTotals() map[HardwareType]int {
	totals := map[HardwareType]int{}
	for _, child := range n.Children {
		totals[child.HardwareType()]++
	}
	return totals
}

// Stringify tree
func (n *Node) Stringify() string {
	return n.stringify(0)
}

func (n *Node) stringify(indent int) string {
	prefix := ""
	for i := 0; i < indent; i++ {
		prefix += "  "
	}

	ret := prefix + n.Text
	if n.Value != "" {
		ret += ": " + n.Value
	}
	if n.Max != "" && n.Min != "" && n.Max != "-" && n.Min != "-" {
		ret += fmt.Sprintf(" (%s - %s)", n.Min, n.Max)
	}
	ret += "\n"
	for _, child := range n.Children {
		ret += child.stringify(indent + 1)
	}

	return ret
}