%% Copyright 2015 Mariano Guerra
%% 
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%% 
%%     http://www.apache.org/licenses/LICENSE-2.0
%% 
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.

-module(fn_error).
-export([to_string/2, normalize/1, normalize_warning/1]).

to_string(Module, Errors) when is_list(Errors) ->
    lists:map(fun (Error) -> to_string(Module, Error) end, Errors);
to_string(Module, {Type, Line, Details}) ->
    TypeStr = type_to_string(Type),
    DetailsStr = details_to_string(Details),
    io_lib:format("~p:~p:~p: ~s at line ~p: ~s~n", [Module, Line, Type, TypeStr, Line, DetailsStr]).

type_to_string(invalid_fn_ref) -> <<"Invalid Function Reference">>;
type_to_string(invalid_bin_type_specifier_field) -> <<"Invalid Type Specifier Field">>;
type_to_string(invalid_bin_type_specifier_value) -> <<"Invalid Type Specifier Value">>;
type_to_string(unknown_compiler_info) -> <<"Unknown Compiler Info Name">>;
type_to_string(case_mismatch) -> <<"Case Mismatch">>;
type_to_string(bad_record_field_init) -> <<"Bad Record Field Initialization">>;
type_to_string(bad_record_field_decl) -> <<"Bad Record Field Declaration">>;
type_to_string(invalid_export) -> <<"Invalid Export">>;
type_to_string(invalid_expression) -> <<"Invalid Expression">>;
type_to_string(invalid_top_level_expression) -> <<"Invalid Top Level Expression">>;
type_to_string(invalid_type_declaration) -> <<"Invalid Type Declaration">>;
type_to_string(invalid_type_value) -> <<"Invalid Type Value">>;
type_to_string(invalid_type_argument) -> <<"Invalid Type Argument">>;
type_to_string(invalid_catch) -> <<"Invalid Catch">>;
type_to_string(duplicated_function_spec) -> <<"Duplicated Function Spec">>;
type_to_string(Other) -> atom_to_list(Other).

format_maybe_ast({ast, Ast}) -> fn_pp:print(Ast);
format_maybe_ast(Other) -> io_lib:format("~p", [Other]).

details_to_string({expected, Expected, got, Got}) when is_list(Expected) ->
    io_lib:format("Expected ~s got ~s", [Expected, format_maybe_ast(Got)]);
details_to_string({expected, Expected, got, Got}) ->
    io_lib:format("Expected ~p got ~s", [Expected, format_maybe_ast(Got)]);
details_to_string(Other) -> format_maybe_ast(Other).

normalize({error, {Line, fn_parser, Reason}}) ->
    io_lib:format("~p: parse error: '~s'", [Line, Reason]);
normalize({error, {Line, fn_lexer, {illegal, Reason}}}) ->
    io_lib:format("~p: illegal char ~p", [Line, Reason]);
normalize({error, {Line, fn_lexer, {eof, _}}}) ->
    io_lib:format("~p: end of file", [Line]);
normalize({error, {Line, fn_lexer, Reason}}) when is_list(Reason) ->
    io_lib:format("~p: ~s", [Line, Reason]);
normalize({error, {efene, _Module, Reason}}) ->
    io_lib:format("~s", [Reason]);
normalize({error, Other}) ->
    io_lib:format("~p", [Other]);
normalize({Line, erl_lint, Reason}) ->
    io_lib:format("line ~p: ~s", [Line, erl_lint:format_error(Reason)]);
normalize({Line, sys_core_fold, Reason}) ->
    io_lib:format("line ~p: ~s", [Line, sys_core_fold:format_error(Reason)]);
normalize({Line, v3_kernel, Reason}) ->
    io_lib:format("line ~p: ~s", [Line, v3_kernel:format_error(Reason)]);
normalize({_Path, Errors}) when is_list(Errors) ->
    ErrorsStrs = [normalize(Error) || Error <- Errors],
    [string:join(ErrorsStrs, "\n"), "\n"];
normalize(Other) ->
    io_lib:format("~p", [Other]).

normalize_warning({implicit_override, Line,
                   #{fn := {FnName, Arity},
                     prev_fn := #{module_path := PrevPath, line := PrevLine}}}) ->
    io_lib:format("~p: Implicit override of function ~p/~p at line ~p (previously defined at ~p line ~p, hint: add @override attribute to supress warning)", [Line, FnName, Arity, Line, PrevPath, PrevLine]);
normalize_warning(Other) ->
    io_lib:format("~p", [Other]).