// Code below generated from decode_gen.go.tmpl
package decode

import (
	"fmt"
	"math/big"

	"github.com/wader/fq/pkg/bitio"
	"github.com/wader/fq/pkg/scalar"
)

{{- range $name, $t := $.types }}
	// Type {{$name}}

	// TryField{{$name}}ScalarFn tries to add a field, calls scalar functions and returns actual value as a {{$name}}
	func (d *D) TryField{{$name}}ScalarFn(name string, fn func(d *D) (scalar.S, error), sms ...scalar.Mapper) ({{$t.go_type}}, error) {
		v, err := d.TryFieldScalarFn(name, func(_ scalar.S) (scalar.S, error) { return fn(d) }, sms...)
		if err != nil {
			return {{$t.zero}}, err
		}
		return v.Actual{{$name}}(), err
	}

	// Field{{$name}}ScalarFn adds a field, calls scalar functions and returns actual value as a {{$name}}
	func (d *D) Field{{$name}}ScalarFn(name string, fn func(d *D) scalar.S, sms ...scalar.Mapper) {{$t.go_type}} {
		v, err := d.TryFieldScalarFn(name, func(_ scalar.S) (scalar.S, error) { return fn(d), nil }, sms...)
		if err != nil {
			panic(IOError{Err: err, Name: name, Op: "{{$name}}", Pos: d.Pos()})
		}
		return v.Actual{{$name}}()
	}

	// Field{{$name}}Fn adds a field, calls {{$t.go_type}} decode function and returns actual value as a {{$name}}
	func (d *D) Field{{$name}}Fn(name string, fn func(d *D) {{$t.go_type}}, sms ...scalar.Mapper) {{$t.go_type}} {
		return d.Field{{$name}}ScalarFn(name, func(d *D) scalar.S { return scalar.S{Actual: fn(d) } }, sms...)
	}

	// TryField{{$name}}Fn tries to add a field, calls {{$t.go_type}} decode function and returns actual value as a {{$name}}
	func (d *D) TryField{{$name}}Fn(name string, fn func(d *D) ({{$t.go_type}}, error), sms ...scalar.Mapper) ({{$t.go_type}}, error) {
		return d.TryField{{$name}}ScalarFn(name, func(d *D) (scalar.S, error) {
			v, err := fn(d)
			return scalar.S{Actual: v}, err
		}, sms...)
	}

	// TryFieldScalar{{$name}}Fn tries to add a field, calls {{$t.go_type}} decode function and returns scalar
	func (d *D) TryFieldScalar{{$name}}Fn(name string, fn func(d *D) ({{$t.go_type}}, error), sms ...scalar.Mapper) (*scalar.S, error) {
		return d.TryFieldScalarFn(name, func(_ scalar.S) (scalar.S, error) {
			v, err := fn(d)
			return scalar.S{Actual: v}, err
		}, sms...)
	}

	// FieldScalar{{$name}}Fn tries to add a field, calls {{$t.go_type}} decode function and returns scalar
	func (d *D) FieldScalar{{$name}}Fn(name string, fn func(d *D) {{$t.go_type}}, sms ...scalar.Mapper) *scalar.S {
		v, err := d.TryFieldScalar{{$name}}Fn(name, func(d *D) ({{$t.go_type}}, error) { return fn(d), nil }, sms...)
		if err != nil {
			panic(IOError{Err: err, Name: name, Op: "{{$name}}", Pos: d.Pos()})
		}
		return v
	}
{{end}}

{{- range $name, $t := $.types }}
	{{- if $t.compare}}
		// Require/Assert/Validate {{$name}}

		func require{{$name}}(name string, s scalar.S, desc bool, fail bool, vs ...{{$t.go_type}}) (scalar.S, error) {
			a := s.Actual{{$name}}()
			for _, b := range vs {
				if {{$t.compare}} {
					if desc {
						s.Description = "valid"
					}
					return s, nil
				}
			}
			if desc {
				s.Description = "invalid"
			}
			if fail {
				return s, fmt.Errorf("failed to %s {{$name}}", name)
			}
			return s, nil
		}

		// Require{{$name}} that actual value is one of given {{$t.go_type}} values
		func (d *D) Require{{$name}}(vs ...{{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return require{{$name}}("require", s, false, true, vs...) })
		}

		// Assert{{$name}} validate and asserts that actual value is one of given {{$t.go_type}} values
		func (d *D) Assert{{$name}}(vs ...{{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return require{{$name}}("assert", s, true, !d.Options.Force, vs...) })
		}

		// Validate{{$name}} validates that actual value is one of given {{$t.go_type}} values
		func (d *D) Validate{{$name}}(vs ...{{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return require{{$name}}("validate", s, true, false, vs...) })
		}
	{{- end}}
	{{- if $t.range}}
		// Require/Assert/ValidatRange {{$name}}

		func requireRange{{$name}}(name string, s scalar.S, desc bool, fail bool, start, end {{$t.go_type}}) (scalar.S, error) {
			a := s.Actual{{$name}}()
			if {{$t.range}} {
				if desc {
					s.Description = "valid"
				}
				return s, nil
			}
			if desc {
				s.Description = "invalid"
			}
			if fail {
				return s, fmt.Errorf("failed to %s {{$name}} range %v-%v", name, start, end)
			}
			return s, nil
		}

		// Require{{$name}}Range require that actual value is in range
		func (d *D) Require{{$name}}Range(start, end {{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return requireRange{{$name}}("require", s, false, true, start, end) })
		}

		// Assert{{$name}}Range asserts that actual value is in range
		func (d *D) Assert{{$name}}Range(start, end {{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return requireRange{{$name}}("assert", s, true, !d.Options.Force, start, end) })
		}

		// Validate{{$name}}Range validates that actual value is in range
		func (d *D) Validate{{$name}}Range(start, end {{$t.go_type}}) scalar.Mapper {
			return scalar.Fn(func(s scalar.S) (scalar.S, error) { return requireRange{{$name}}("validate", s, true, false, start, end) })
		}
	{{- end}}
{{- end}}

{{- range $r := $.readers }}
	{{- $t := index $.types $r.type }}

	{{- range $v := $r.variants }}
		{{- $range_start := 1 }}
		{{- $range_stop := 2 }}
		{{- if $v.range }}
			{{- $range_start = index $v.range 0 }}
			{{- $range_stop = index $v.range 1 }}
		{{- end}}

		{{- range $n := xrange $range_start $range_stop }}

			// Reader {{$r.name}}{{replace $v.name "$n" $n}}

			// Try{{$r.name}}{{replace $v.name "$n" $n}} tries to read {{replace $v.doc "$n" $n}}
			func (d *D) Try{{$r.name}}{{replace $v.name "$n" $n}}({{$v.params}}) ({{$t.go_type}}, error) { return {{replace $v.call "$n" $n}} }

			// {{$r.name}}{{replace $v.name "$n" $n}} reads {{replace $v.doc "$n" $n}}
			func (d *D) {{$r.name}}{{replace $v.name "$n" $n}}({{$v.params}}) {{$t.go_type}} {
				v, err := {{replace $v.call "$n" $n}}
				if err != nil {
					panic(IOError{Err: err, Op: "{{$r.name}}{{replace $v.name "$n" $n}}", Pos: d.Pos()})
				}
				return v
			}

			// TryFieldScalar{{$r.name}}{{replace $v.name "$n" $n}} tries to add a field and read {{replace $v.doc "$n" $n}}
			func (d *D) TryFieldScalar{{$r.name}}{{replace $v.name "$n" $n}}(name string{{if $v.params}}, {{$v.params}}{{end}}, sms ...scalar.Mapper) (*scalar.S, error) {
				s, err := d.TryFieldScalarFn(name, func(s scalar.S) (scalar.S, error) {
					v, err := {{replace $v.call "$n" $n}}
					s.Actual = v
					return s, err
				}, sms...)
				if err != nil {
					return nil, err
				}
				return s, err
			}

			// FieldScalar{{$r.name}}{{replace $v.name "$n" $n}} adds a field and reads {{replace $v.doc "$n" $n}}
			func (d *D) FieldScalar{{$r.name}}{{replace $v.name "$n" $n}}(name string{{if $v.params}}, {{$v.params}}{{end}}, sms ...scalar.Mapper) *scalar.S {
				s, err := d.TryFieldScalar{{$r.name}}{{replace $v.name "$n" $n}}(name{{if $v.args}}, {{$v.args}}{{end}}, sms...)
				if err != nil {
					panic(IOError{Err: err, Name: name, Op: "{{$r.name}}{{replace $v.name "$n" $n}}", Pos: d.Pos()})
				}
				return s
			}

			// TryField{{$r.name}}{{replace $v.name "$n" $n}} tries to add a field and read {{replace $v.doc "$n" $n}}
			func (d *D) TryField{{$r.name}}{{replace $v.name "$n" $n}}(name string{{if $v.params}}, {{$v.params}}{{end}}, sms ...scalar.Mapper) ({{$t.go_type}}, error) {
				s, err := d.TryFieldScalar{{$r.name}}{{replace $v.name "$n" $n}}(name{{if $v.args}}, {{$v.args}}{{end}}, sms...)
				return s.Actual{{$r.type}}(), err
			}

			// Field{{$r.name}}{{replace $v.name "$n" $n}} adds a field and reads {{replace $v.doc "$n" $n}}
			func (d *D) Field{{$r.name}}{{replace $v.name "$n" $n}}(name string{{if $v.params}}, {{$v.params}}{{end}}, sms ...scalar.Mapper) {{$t.go_type}} {
				return d.FieldScalar{{$r.name}}{{replace $v.name "$n" $n}}(name{{if $v.args}}, {{$v.args}}{{end}}, sms...).Actual{{$r.type}}()
			}
		{{- end}}
	{{- end}}
{{- end}}