{%- macro repl(text) -%}
{#- Copied from semconvgen: https://github.com/open-telemetry/opentelemetry-go-build-tools/blob/3e69152c51c56213b65c0fc6e5954293b522103c/semconvgen/generator.go#L419-L426 -#}
{{ text | replace("RedisDatabase", "RedisDB") | replace("IPTCP", "TCP") | replace("IPUDP", "UDP") | replace("Lineno", "LineNumber") }}
{%- endmacro -%}
  
{%- macro smart_title_case(text) -%}
{%- for i in range(0, text | length) -%}
    {%- if i == 0 or text[i-1] in ['.', '_'] -%}
        {{ text[i] | upper }}
    {%- elif not text[i] in ['.', '_'] -%}
        {{ text[i] }}
    {%- endif -%}
{%- endfor -%}
{%- endmacro -%}

{%- macro to_go_name(fqn="", pkg="") -%}
{%- if pkg != "" -%}
{%- set n = pkg | length -%}
{%- if pkg == fqn[:n] -%}
{%- set fqn = fqn[n:] -%}
{%- if fqn[0] == "." or fqn[0] == "." -%}
{%- set fqn = fqn[1:] -%}
{%- endif -%}
{%- endif -%}
{%- endif -%}
{{ repl(smart_title_case(fqn | replace(" ", "") | replace("_", ".") | acronym)) }}
{%- endmacro -%}

{%- macro deprecated_doc(attr) -%}
{% if attr is deprecated %}Deprecated: {{ attr.deprecated }}{% endif %}
{%- endmacro -%}

{%- macro notes_doc(attr) -%}
{% if attr.note %}Note: {{ attr.note }}{% endif %}
{%- endmacro -%}

{%- macro examples_doc(attr) -%}
{%- if attr.examples is iterable %}
Examples: {{ attr.examples | trim("[]") }}
{%- endif %}
{%- endmacro -%}

{%- macro lower_first(line) -%}
{%- if line[0] is upper and line[1] is upper -%}
{#- Assume an acronym -#}
{{ line }}
{%- else -%}
{{ line[0]|lower }}{{ line[1:] }}
{%- endif -%}
{%- endmacro -%}

{%- macro first_word(line, delim=" ") -%}
{%- for c in line -%}
{%- if c == delim -%}
{{ line[:loop.index0] }}
{%- set line = "" -%}
{%- endif -%}
{%- endfor -%}
{%- endmacro -%}

{%- macro prefix_brief(brief, prefix="") -%}
{%- set norms = [
       "MUST", "REQUIRED", "SHALL",
       "SHOULD", "RECOMMENDED",
       "MAY", "OPTIONAL"
] -%}
{%- set brief = brief | trim() -%}
{%- if first_word(brief) is in norms -%}
It {{ brief }}.
{%- else -%}
{{ prefix }} {% if brief[:2] == "A " or brief[:3] == "An " or brief[:4] == "The " -%}
  {{ lower_first(brief) | trim(".") }}.
{%- else -%}
  the {{ lower_first(brief) | trim(".") }}.
{%- endif -%}
{%- endif -%}
{%- endmacro -%}

{%- macro it_reps(brief) -%}
{{ prefix_brief(brief, "It represents") }}
{%- endmacro -%}

{%- macro keydoc(attr, pkg="") -%}
{{ to_go_name(attr.name, pkg) }}Key is the attribute Key conforming to the "{{ attr.name }}" semantic conventions. {{ it_reps(attr.brief) }}

{% if attr is enum -%}
Type: Enum
{%- else -%}
Type: {{ attr.type }}
{%- endif %}
RequirementLevel: {{ attr.requirement_level | title }}
Stability: {{ attr.stability | title }}
{{ examples_doc(attr) }}
{{ notes_doc(attr) }}
{{ deprecated_doc(attr) }}
{%- endmacro -%}

{%- macro generate_consts(group, pkg="") -%}
{#- TODO: generate with group docs (i.e group by registry namespace) #}

{{ ["Namespace: " ~ group.root_namespace] | comment(format="go") }}
const (
{%- for attribute in group.attributes if not attribute.deprecated %}
{#- TODO: Handle template attributes. #}
{%- if not attribute.type is template_type %}
{{ keydoc(attribute) | comment(format="go_1tab") }}
	{{to_go_name(attribute.name, pkg=pkg)}}Key = attribute.Key("{{attribute.name}}")
{% endif -%}
{%- endfor -%}
)
{%- endmacro -%}

{%- macro generate_funcs(group, pkg="") -%}
{%- for attribute in group.attributes if not attribute is enum %}
{#- TODO: Handle template attributes. #}
{%- if not attribute.type is template_type %}

{{ [to_go_name(attribute.name, pkg) ~ " returns an attribute KeyValue conforming to the \"" ~ attribute.name ~ "\" semantic conventions. " ~ it_reps(attribute.brief) ] | comment(format="go") }}
func {{to_go_name(attribute.name, pkg)}}(val {{attribute.type | instantiated_type | map_text("attribute_type_value")}}) attribute.KeyValue {
	return {{to_go_name(attribute.name, pkg)}}Key.{{attribute.type | instantiated_type | map_text("attribute_type_method")}}(val)
}
{%- endif %}
{%- endfor %}
{%- endmacro -%}

{%- macro generate_vars(group, pkg="") -%}
{#- Render values for enums #}
{%- for attribute in group.attributes %}
{%- if attribute is enum %}

{{ ["Enum values for " ~ attribute.name] | comment(format="go") }}
var (
{%- for value in attribute.type.members %}
{%- if value.deprecated %}
{{ ["Deprecated: " ~ value.deprecated | trim(".") ~ "." ] | comment(format="go_1tab") }}
{%- else %}
{{ [value.brief or value.id, "Stability: " ~ value.stability] | comment(format="go_1tab") }}
{%- endif %}
	{{to_go_name(attribute.name ~ "." ~ value.id, pkg=pkg)}} = {{ to_go_name(attribute.name, pkg=pkg) }}Key.{{attribute.type | instantiated_type | map_text("attribute_type_method")}}({{ value.value | print_member_value }})
{%- endfor %}
)
{%- endif %}
{%- endfor %}
{%- endmacro -%}

{%- macro metric_keydoc(metric, pkg="") -%}
{%- if not metric.brief -%}
{{ to_go_name(metric.metric_name, pkg=pkg) }} is the metric conforming to the "{{ metric.metric_name}}" semantic conventions.
{%- else -%}
{{ to_go_name(metric.metric_name, pkg=pkg) }} is the metric conforming to the "{{ metric.metric_name}}" semantic conventions. {{ it_reps(metric.brief)|trim(".") }}.
{%- endif %}
{%- endmacro -%}

{%- macro metric_typedoc(metric, pkg="") -%}
{%- if not metric.brief -%}
{{ to_go_name(metric.metric_name, pkg=pkg) }} is an instrument used to record metric values conforming to the "{{ metric.metric_name}}" semantic conventions.
{%- else -%}
{{ to_go_name(metric.metric_name, pkg=pkg) }} is an instrument used to record metric values conforming to the "{{ metric.metric_name}}" semantic conventions. {{ it_reps(metric.brief)|trim(".") }}.
{%- endif %}
{%- endmacro -%}

{%- macro member_type(member) %}
{%- if member.value is string %}string{%- endif %}
{%- if member.value is boolean %}bool{%- endif %}
{%- if member.value is int %}int64{%- endif %}
{%- if member.value is float %}float64{%- endif %}
{%- endmacro %}

{%- macro attr_type(attribute) %}
{%- if attribute.type is mapping %}
{{- member_type(attribute.type.members[0]) }}
{%- elif attribute.type == "template[boolean]" %}boolean
{%- elif attribute.type == "template[int]" %}int
{%- elif attribute.type == "template[double]" %}double
{%- elif attribute.type == "template[string]" %}string
{%- elif attribute.type == "template[boolean[]]" %}boolean[]
{%- elif attribute.type == "template[int[]]" %}int[]
{%- elif attribute.type == "template[double[]]" %}double[]
{%- elif attribute.type == "template[string[]]" %}string[]
{%- else %}{{ attribute.type | trim }}
{%- endif %}
{%- endmacro %}
