-module(dream@http@request).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/dream/http/request.gleam").
-export([method_to_string/1, parse_method/1, get_query_param/2, has_content_type/2, is_method/2, set_params/2, get_param/2, get_int_param/2, get_string_param/2]).
-export_type([method/0, protocol/0, version/0, request/0, path_param/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.

?MODULEDOC(
    " HTTP request types and utilities\n"
    "\n"
    " Core request types and functions for working with HTTP requests in Dream.\n"
    " Includes request methods, path parameters, query parameters, and request inspection.\n"
    "\n"
    " ## Quick Example\n"
    "\n"
    " ```gleam\n"
    " import dream/http/request.{type Request}\n"
    "\n"
    " pub fn show_user(request: Request, context, services) {\n"
    "   // Extract path parameter\n"
    "   case request.get_int_param(request, \"id\") {\n"
    "     Ok(id) -> {\n"
    "       // Get query parameter\n"
    "       let format = request.get_query_param(request.query, \"format\")\n"
    "       \n"
    "       // Access request data\n"
    "       let method = request.method  // Get, Post, etc.\n"
    "       let path = request.path      // \"/users/123\"\n"
    "       let body = request.body      // Request body as string\n"
    "       \n"
    "       // Build response...\n"
    "     }\n"
    "     Error(msg) -> // Handle error\n"
    "   }\n"
    " }\n"
    " ```\n"
).

-type method() :: post | get | put | delete | patch | options | head.

-type protocol() :: http | https.

-type version() :: http1 | http2 | http3.

-type request() :: {request,
        method(),
        protocol(),
        version(),
        binary(),
        binary(),
        list({binary(), binary()}),
        gleam@option:option(binary()),
        gleam@option:option(integer()),
        gleam@option:option(binary()),
        binary(),
        list(dream@http@header:header()),
        list(dream@http@cookie:cookie()),
        gleam@option:option(binary()),
        gleam@option:option(integer())}.

-type path_param() :: {path_param,
        binary(),
        binary(),
        gleam@option:option(binary()),
        {ok, integer()} | {error, nil},
        {ok, float()} | {error, nil}}.

-file("src/dream/http/request.gleam", 185).
?DOC(" Convert Method to its string representation\n").
-spec method_to_string(method()) -> binary().
method_to_string(Method) ->
    case Method of
        get ->
            <<"GET"/utf8>>;

        post ->
            <<"POST"/utf8>>;

        put ->
            <<"PUT"/utf8>>;

        delete ->
            <<"DELETE"/utf8>>;

        patch ->
            <<"PATCH"/utf8>>;

        options ->
            <<"OPTIONS"/utf8>>;

        head ->
            <<"HEAD"/utf8>>
    end.

-file("src/dream/http/request.gleam", 198).
?DOC(" Parse a string to Method (case-insensitive)\n").
-spec parse_method(binary()) -> gleam@option:option(method()).
parse_method(Str) ->
    case string:lowercase(Str) of
        <<"get"/utf8>> ->
            {some, get};

        <<"post"/utf8>> ->
            {some, post};

        <<"put"/utf8>> ->
            {some, put};

        <<"delete"/utf8>> ->
            {some, delete};

        <<"patch"/utf8>> ->
            {some, patch};

        <<"options"/utf8>> ->
            {some, options};

        <<"head"/utf8>> ->
            {some, head};

        _ ->
            none
    end.

-file("src/dream/http/request.gleam", 254).
-spec match_query_key(binary(), binary(), binary()) -> gleam@option:option(binary()).
match_query_key(Key, Name, Value) ->
    case Key =:= Name of
        true ->
            {some, Value};

        false ->
            none
    end.

-file("src/dream/http/request.gleam", 269).
?DOC(
    " Decode a URL-encoded component (key or value)\n"
    " \n"
    " Handles percent-encoded sequences (e.g., %20, %26) and plus signs (+ → space)\n"
    " Falls back to original string if decoding fails\n"
).
-spec decode_url_component(binary()) -> binary().
decode_url_component(Component) ->
    With_spaces = gleam@string:replace(Component, <<"+"/utf8>>, <<" "/utf8>>),
    case gleam_stdlib:percent_decode(With_spaces) of
        {ok, Decoded} ->
            Decoded;

        {error, _} ->
            With_spaces
    end.

-file("src/dream/http/request.gleam", 237).
-spec parse_query_pair(binary(), binary()) -> gleam@option:option(binary()).
parse_query_pair(Param, Name) ->
    case gleam@string:split(Param, <<"="/utf8>>) of
        [Key, Value] ->
            Decoded_key = decode_url_component(Key),
            Decoded_value = decode_url_component(Value),
            match_query_key(Decoded_key, Name, Decoded_value);

        [Key@1] ->
            Decoded_key@1 = decode_url_component(Key@1),
            match_query_key(Decoded_key@1, Name, <<""/utf8>>);

        _ ->
            none
    end.

-file("src/dream/http/request.gleam", 221).
-spec get_query_param_recursive(list(binary()), binary()) -> gleam@option:option(binary()).
get_query_param_recursive(Params, Name) ->
    case Params of
        [] ->
            none;

        [Param | Rest] ->
            Result = parse_query_pair(Param, Name),
            case Result of
                {some, _} ->
                    Result;

                none ->
                    get_query_param_recursive(Rest, Name)
            end
    end.

-file("src/dream/http/request.gleam", 217).
?DOC(
    " Get a query parameter value from the raw query string\n"
    " \n"
    " Properly decodes URL-encoded values (e.g., %20 → space, %26 → &)\n"
    " Returns None if the parameter is not found.\n"
).
-spec get_query_param(binary(), binary()) -> gleam@option:option(binary()).
get_query_param(Query, Name) ->
    get_query_param_recursive(gleam@string:split(Query, <<"&"/utf8>>), Name).

-file("src/dream/http/request.gleam", 281).
?DOC(" Check if request has a specific content type\n").
-spec has_content_type(request(), binary()) -> boolean().
has_content_type(Request, Content_type) ->
    case erlang:element(14, Request) of
        {some, Actual_content_type} ->
            gleam_stdlib:contains_string(Actual_content_type, Content_type);

        none ->
            false
    end.

-file("src/dream/http/request.gleam", 290).
?DOC(" Check if request method matches\n").
-spec is_method(request(), method()) -> boolean().
is_method(Request, Method) ->
    erlang:element(2, Request) =:= Method.

-file("src/dream/http/request.gleam", 295).
?DOC(" Create a new request with updated params\n").
-spec set_params(request(), list({binary(), binary()})) -> request().
set_params(Request, New_params) ->
    {request,
        erlang:element(2, Request),
        erlang:element(3, Request),
        erlang:element(4, Request),
        erlang:element(5, Request),
        erlang:element(6, Request),
        New_params,
        erlang:element(8, Request),
        erlang:element(9, Request),
        erlang:element(10, Request),
        erlang:element(11, Request),
        erlang:element(12, Request),
        erlang:element(13, Request),
        erlang:element(14, Request),
        erlang:element(15, Request)}.

-file("src/dream/http/request.gleam", 319).
-spec extract_format(list(binary()), binary()) -> {binary(),
    gleam@option:option(binary())}.
extract_format(Parts, Raw) ->
    case Parts of
        [Val, Ext] ->
            {Val, {some, Ext}};

        _ ->
            {Raw, none}
    end.

-file("src/dream/http/request.gleam", 305).
?DOC(" Parse a path parameter string into PathParam with format detection\n").
-spec parse_path_param(binary()) -> path_param().
parse_path_param(Raw) ->
    Parts = gleam@string:split(Raw, <<"."/utf8>>),
    {Value, Format} = extract_format(Parts, Raw),
    {path_param,
        Raw,
        Value,
        Format,
        gleam_stdlib:parse_int(Value),
        gleam_stdlib:parse_float(Value)}.

-file("src/dream/http/request.gleam", 372).
?DOC(
    " Extract a path parameter by name\n"
    "\n"
    " Returns a `PathParam` with automatic type conversion and format detection.\n"
    " If the parameter doesn't exist, returns an error message.\n"
    "\n"
    " For common cases, use `get_int_param()` or `get_string_param()` instead,\n"
    " which return `Result(Int, String)` or `Result(String, String)` with\n"
    " custom error messages.\n"
    "\n"
    " ## Examples\n"
    "\n"
    " ```gleam\n"
    " // Route: /users/:id\n"
    " // Request: /users/123\n"
    " case get_param(request, \"id\") {\n"
    "   Ok(param) -> {\n"
    "     param.value  // \"123\"\n"
    "     param.as_int // Ok(123)\n"
    "   }\n"
    "   Error(msg) -> // handle error\n"
    " }\n"
    " ```\n"
    "\n"
    " ```gleam\n"
    " // Route: /users/:id\n"
    " // Request: /users/123.json\n"
    " case get_param(request, \"id\") {\n"
    "   Ok(param) -> {\n"
    "     param.value  // \"123\"\n"
    "     param.format // Some(\"json\")\n"
    "     param.as_int // Ok(123)\n"
    "   }\n"
    "   Error(msg) -> // handle error\n"
    " }\n"
    " ```\n"
    "\n"
    " ```gleam\n"
    " // For simple integer extraction, use get_int_param:\n"
    " case get_int_param(request, \"id\") {\n"
    "   Ok(id) -> show_user(id)\n"
    "   Error(msg) -> json_response(status.bad_request, error_json(msg))\n"
    " }\n"
    " ```\n"
).
-spec get_param(request(), binary()) -> {ok, path_param()} | {error, binary()}.
get_param(Request, Name) ->
    case gleam@list:key_find(erlang:element(7, Request), Name) of
        {ok, Value} ->
            {ok, parse_path_param(Value)};

        {error, _} ->
            {error, <<"Missing required path parameter: "/utf8, Name/binary>>}
    end.

-file("src/dream/http/request.gleam", 401).
-spec param_to_int(path_param(), binary()) -> {ok, integer()} |
    {error, binary()}.
param_to_int(Param, Name) ->
    case erlang:element(5, Param) of
        {ok, Id} ->
            {ok, Id};

        {error, _} ->
            {error, <<Name/binary, " must be an integer"/utf8>>}
    end.

-file("src/dream/http/request.gleam", 394).
?DOC(
    " Extract a path parameter as an integer\n"
    "\n"
    " Returns a Result with a custom error message if the parameter is missing\n"
    " or cannot be converted to an integer.\n"
    "\n"
    " ## Examples\n"
    "\n"
    " ```gleam\n"
    " // Route: /users/:id\n"
    " // Request: /users/123\n"
    " case get_int_param(request, \"id\") {\n"
    "   Ok(id) -> show_user(id)\n"
    "   Error(msg) -> json_response(status.bad_request, error_json(msg))\n"
    " }\n"
    " ```\n"
).
-spec get_int_param(request(), binary()) -> {ok, integer()} | {error, binary()}.
get_int_param(Request, Name) ->
    case get_param(Request, Name) of
        {ok, Param} ->
            param_to_int(Param, Name);

        {error, _} ->
            {error,
                <<<<"Missing "/utf8, Name/binary>>/binary, " parameter"/utf8>>}
    end.

-file("src/dream/http/request.gleam", 432).
-spec param_to_string(path_param(), binary()) -> {ok, binary()} |
    {error, binary()}.
param_to_string(Param, _) ->
    {ok, erlang:element(3, Param)}.

-file("src/dream/http/request.gleam", 422).
?DOC(
    " Extract a path parameter as a string\n"
    "\n"
    " Returns a Result with a custom error message if the parameter is missing.\n"
    "\n"
    " ## Examples\n"
    "\n"
    " ```gleam\n"
    " // Route: /users/:name\n"
    " // Request: /users/john\n"
    " case get_string_param(request, \"name\") {\n"
    "   Ok(name) -> show_user_by_name(name)\n"
    "   Error(msg) -> json_response(status.bad_request, error_json(msg))\n"
    " }\n"
    " ```\n"
).
-spec get_string_param(request(), binary()) -> {ok, binary()} |
    {error, binary()}.
get_string_param(Request, Name) ->
    case get_param(Request, Name) of
        {ok, Param} ->
            param_to_string(Param, Name);

        {error, _} ->
            {error,
                <<<<"Missing "/utf8, Name/binary>>/binary, " parameter"/utf8>>}
    end.