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// Copyright 2025 Shota FUJI
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

const std = @import("std");

items: []const Item,

pub const CBaseType = union(enum) {
    int: u16,
    uint: u16,
    float: void,
    double: void,
    char: void,
    bool: void,
    void: void,
    string: void,
    custom: []const u8,

    pub fn fromZigType(comptime T: type) CBaseType {
        return switch (@typeInfo(T)) {
            .int => |int| if (int.signedness == .signed) .{
                .int = int.bits,
            } else .{
                .uint = int.bits,
            },
            .float => |float| switch (float.bits) {
                32 => .float,
                64 => .double,
                else => @compileError(std.fmt.comptimePrint("{d} bits float is not exportable.", .{float.bits})),
            },
            .bool => .bool,
            .@"enum" => .{ .custom = T.cname },
            .@"struct" => .{ .custom = T.cname },
            .void => .void,
            .pointer => |pointer| switch (@typeInfo(pointer.child)) {
                .@"struct" => .{ .custom = pointer.child.cname },
                else => {
                    if (pointer.child == u8 and pointer.is_const and pointer.size == .many and std.builtin.Type.Pointer.sentinel(pointer) == 0) {
                        return .string;
                    }

                    @compileError(
                        std.fmt.comptimePrint("Pointer to non-struct type {s} is not exportable.", .{@typeName(T)}),
                    );
                },
            },
            else => {
                @compileError(
                    std.fmt.comptimePrint("Type {s} is not exportable.", .{@typeName(T)}),
                );
            },
        };
    }
};

pub const CType = union(enum) {
    value: CBaseType,
    pointer: struct {
        type: CBaseType,
        @"const": bool,
    },

    pub fn fromZigType(comptime T: type) CType {
        return switch (@typeInfo(T)) {
            .pointer => |pointer| {
                if (pointer.child == u8 and
                    pointer.is_const and
                    pointer.size == .many and
                    std.builtin.Type.Pointer.sentinel(pointer) == 0)
                {
                    return .{
                        .value = .string,
                    };
                }

                return .{ .pointer = .{
                    .type = CBaseType.fromZigType(pointer.child),
                    .@"const" = pointer.is_const,
                } };
            },
            .optional => |optional| fromZigType(optional.child),
            else => .{ .value = CBaseType.fromZigType(T) },
        };
    }
};

pub const EnumField = struct {
    name: []const u8,
    value: c_int,
};

pub const FunctionParameter = struct {
    type: CType,
};

pub const Function = struct {
    name: []const u8,
    parameters: []const FunctionParameter,
    return_type: CType,
};

pub const StructField = struct {
    name: []const u8,
    type: CType,
};

pub const Item = union(enum) {
    @"enum": struct {
        cname: []const u8,
        fields: []const EnumField,
    },
    @"struct": struct {
        cname: []const u8,
        new_function: ?Function = null,
        member_functions: []const Function,
        fields: []const StructField,
    },
    @"opaque": struct {
        cname: []const u8,
        new_function: Function,
        member_functions: []const Function,
    },
};