1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use std::fmt::Display;

use windows::Win32::Foundation::GetLastError;
use windows::core::HRESULT;
use windows::Win32::Foundation::E_FAIL;

/// Error caused by unknown reason.
pub const ERR_NONE: i32 = 0;
/// Error occurs when an element or object is not found.
pub const ERR_NOTFOUND: i32 = 1;
/// Error occurs when the operation is timeout.
pub const ERR_TIMEOUT: i32 = 2;
/// Error occurs when the element is inactive.
pub const ERR_INACTIVE: i32 = 3;
/// Error caused by unsupported or mismatched type
pub const ERR_TYPE: i32 = 4;
/// Error when a pointer is null.
pub const ERR_NULL_PTR:  i32 = 5;
/// Error format.
pub const ERR_FORMAT: i32 = 6;
/// Error invalid object.
pub const ERR_INVALID_OBJECT: i32 = 7;
/// Error already running.
pub const ERR_ALREADY_RUNNING: i32 = 8;

#[derive(Debug, PartialEq, Eq)]
pub struct Error {
    code: i32,
    message: String
}

impl Error {
    pub fn new(code: i32, message: &str) -> Error {
        Error {
            code,
            message: String::from(message)
        }
    }

    pub fn last_os_error() -> Error {
        let error = unsafe { GetLastError() };
        // let code: i32 = if (error.0 as i32) < 0 {
        //     error.0 as _
        // } else { 
        //     ((error.0 & 0x0000FFFF) | 0x80070000) as _
        // };

        // HRESULT(code).into()
        // if let Err(e) = error {
        //     e.into()
        // } else {
        //     HRESULT(0).into()
        // }
        let result = HRESULT::from_win32(error.0);
        result.into()
    }

    pub fn code(&self) -> i32 {
        self.code
    }

    pub fn result(&self) -> Option<HRESULT> {
        if self.code < 0 {
            Some(HRESULT(self.code))
        } else {
            None
        }
    }

    pub fn message(&self) -> &str {
        self.message.as_str()
    }
}

impl Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.message)
    }
}

impl std::error::Error for Error {
}

impl From<windows::core::Error> for Error {
    fn from(e: windows::core::Error) -> Self {
        Self {
            code: e.code().0,
            message: e.message().to_string()
        }
    }
}

impl Into<windows::core::Error> for Error {
    fn into(self) -> windows::core::Error {
        // if self.code < 0 {
        //     windows::core::Error::new(HRESULT(self.code), self.message)
        // } else {
        //     windows::core::Error::new(E_FAIL, self.message)
        // }
        if let Some(result) = self.result() {
            windows::core::Error::from_hresult(result)
        } else {
            windows::core::Error::new(E_FAIL, self.message)
        }
    }
}

impl From<HRESULT> for Error {
    fn from(result: HRESULT) -> Self {
        Self {
            code: result.0,
            message: result.message().to_string()
        }
    }
}

impl From<String> for Error {
    fn from(message: String) -> Self {
        Error {
            code: 0,
            message
        }
    }
}

impl From<&str> for Error {
    fn from(message: &str) -> Self {
        Error {
            code: 0,
            message: String::from(message)
        }
    }
}

pub type Result<T> = core::result::Result<T, Error>;