-module(oaspec@generate).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/generate.gleam").
-export([generate_all_files/1, generate/2]).
-export_type([generation_summary/0, generate_error/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-type generation_summary() :: {generation_summary,
        list(oaspec@codegen@context:generated_file()),
        binary()}.

-type generate_error() :: {validation_errors,
        list(oaspec@codegen@validate:validation_error())}.

-file("src/oaspec/generate.gleam", 70).
?DOC(" Generate shared files (types, decoders, encoders, middleware, guards).\n").
-spec generate_shared(oaspec@codegen@context:context()) -> list(oaspec@codegen@context:generated_file()).
generate_shared(Ctx) ->
    Type_files = oaspec@codegen@types:generate(Ctx),
    Decoder_files = oaspec@codegen@decoders:generate(Ctx),
    Middleware_files = oaspec@codegen@middleware:generate(Ctx),
    Guard_files = oaspec@codegen@guards:generate(Ctx),
    lists:append([Type_files, Decoder_files, Middleware_files, Guard_files]).

-file("src/oaspec/generate.gleam", 56).
?DOC(" Pure file generation: produce all GeneratedFile values without any IO.\n").
-spec generate_all_files(oaspec@codegen@context:context()) -> list(oaspec@codegen@context:generated_file()).
generate_all_files(Ctx) ->
    Shared = generate_shared(Ctx),
    Server_files = case erlang:element(6, erlang:element(3, Ctx)) of
        server ->
            oaspec@codegen@server:generate(Ctx);

        both ->
            oaspec@codegen@server:generate(Ctx);

        client ->
            []
    end,
    Client_files = case erlang:element(6, erlang:element(3, Ctx)) of
        client ->
            oaspec@codegen@client:generate(Ctx);

        both ->
            oaspec@codegen@client:generate(Ctx);

        server ->
            []
    end,
    lists:append([Shared, Server_files, Client_files]).

-file("src/oaspec/generate.gleam", 28).
?DOC(
    " Pure generation pipeline: hoist → dedup → validate → generate files.\n"
    " Takes an already-parsed spec and config; returns generated files or errors.\n"
    " Does not perform IO — callers handle writing files and printing output.\n"
).
-spec generate(oaspec@openapi@spec:open_api_spec(), oaspec@config:config()) -> {ok,
        generation_summary()} |
    {error, generate_error()}.
generate(Spec, Cfg) ->
    Spec_title = <<<<(erlang:element(2, erlang:element(3, Spec)))/binary,
            " v"/utf8>>/binary,
        (erlang:element(4, erlang:element(3, Spec)))/binary>>,
    Spec@1 = oaspec@openapi@hoist:hoist(Spec),
    Spec@2 = oaspec@openapi@dedup:dedup(Spec@1),
    Ctx = oaspec@codegen@context:new(Spec@2, Cfg),
    Validation_issues = oaspec@codegen@validate:validate(Ctx),
    Blocking_errors = oaspec@codegen@validate:errors_only(Validation_issues),
    case gleam@list:is_empty(Blocking_errors) of
        false ->
            {error, {validation_errors, Blocking_errors}};

        true ->
            Files = generate_all_files(Ctx),
            {ok, {generation_summary, Files, Spec_title}}
    end.