package api

import (
	"debug/dwarf"
	"debug/gosym"
	"fmt"
	"strconv"

	"github.com/derekparker/delve/proc"
)

// convertBreakpoint converts an internal breakpoint to an API Breakpoint.
func ConvertBreakpoint(bp *proc.Breakpoint) *Breakpoint {
	b := &Breakpoint{
		ID:            bp.ID,
		FunctionName:  bp.FunctionName,
		File:          bp.File,
		Line:          bp.Line,
		Addr:          bp.Addr,
		Tracepoint:    bp.Tracepoint,
		Stacktrace:    bp.Stacktrace,
		Goroutine:     bp.Goroutine,
		Variables:     bp.Variables,
		TotalHitCount: bp.TotalHitCount,
	}

	b.HitCount = map[string]uint64{}
	for idx := range bp.HitCount {
		b.HitCount[strconv.Itoa(idx)] = bp.HitCount[idx]
	}

	return b
}

// convertThread converts an internal thread to an API Thread.
func ConvertThread(th *proc.Thread) *Thread {
	var (
		function *Function
		file     string
		line     int
		pc       uint64
	)

	loc, err := th.Location()
	if err == nil {
		pc = loc.PC
		file = loc.File
		line = loc.Line
		function = ConvertFunction(loc.Fn)
	}

	return &Thread{
		ID:       th.Id,
		PC:       pc,
		File:     file,
		Line:     line,
		Function: function,
	}
}

// convertVar converts an internal variable to an API Variable.
func ConvertVar(v *proc.Variable) *Variable {
	r := Variable{
		Addr: v.Addr,
		Name: v.Name,
		Kind: v.Kind,
		Len:  v.Len,
		Cap:  v.Cap,
	}

	if v.DwarfType != nil {
		r.Type = v.DwarfType.String()
	}

	if v.RealType != nil {
		r.RealType = v.RealType.String()
	}

	if v.Unreadable != nil {
		r.Unreadable = v.Unreadable.Error()
	}

	switch typ := v.RealType.(type) {
	case *dwarf.FloatType:
		r.Value = strconv.FormatFloat(v.Value.(float64), 'f', -1, int(typ.Size()*8))
	default:
		if v.Value != nil {
			r.Value = fmt.Sprintf("%v", v.Value)
		}
	}

	r.Children = make([]Variable, len(v.Children))

	for i := range v.Children {
		r.Children[i] = *ConvertVar(&v.Children[i])
	}

	return &r
}

func ConvertFunction(fn *gosym.Func) *Function {
	if fn == nil {
		return nil
	}

	return &Function{
		Name:   fn.Name,
		Type:   fn.Type,
		Value:  fn.Value,
		GoType: fn.GoType,
	}
}

// convertGoroutine converts an internal Goroutine to an API Goroutine.
func ConvertGoroutine(g *proc.G) *Goroutine {
	return &Goroutine{
		ID:             g.Id,
		CurrentLoc:     ConvertLocation(g.CurrentLoc),
		UserCurrentLoc: ConvertLocation(g.UserCurrent()),
		GoStatementLoc: ConvertLocation(g.Go()),
	}
}

func ConvertLocation(loc proc.Location) Location {
	return Location{
		PC:       loc.PC,
		File:     loc.File,
		Line:     loc.Line,
		Function: ConvertFunction(loc.Fn),
	}
}