1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141

-- Copyright 2026 Shota FUJI
--
-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at https://mozilla.org/MPL/2.0/.
--
-- SPDX-License-Identifier: MPL-2.0


module Parameters.Parser exposing (Error(..), parseBool, parseColorSchema, parseInt, parseLength)

import Length exposing (Length, mm, toMM)
import Parameters exposing (ColorSchema(..))
import Parameters.Constraints as Constraints


type Error
    = MissingValue
    | BelowMin Float
    | AboveMax Float
    | NotALength
    | NotAnInt
    | NonexistentVariant String
    | NotABool


parseInt : Constraints.NumberConstraints Int -> String -> Result Error Int
parseInt constraints text =
    case text of
        "" ->
            Err MissingValue

        _ ->
            let
                min =
                    constraints.min
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if x >= m then
                                            Ok x

                                        else
                                            Err (BelowMin (toFloat m))
                                    )
                            )
                        |> Maybe.withDefault identity

                max =
                    constraints.max
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if x <= m then
                                            Ok x

                                        else
                                            Err (AboveMax (toFloat m))
                                    )
                            )
                        |> Maybe.withDefault identity
            in
            String.toInt text
                |> Result.fromMaybe NotAnInt
                |> min
                |> max


parseLength : Constraints.NumberConstraints Length -> String -> Result Error Length
parseLength constraints text =
    case text of
        "" ->
            Err MissingValue

        _ ->
            let
                min =
                    constraints.min
                        |> Maybe.map toMM
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if toMM x >= m then
                                            Ok x

                                        else
                                            Err (BelowMin m)
                                    )
                            )
                        |> Maybe.withDefault identity

                max =
                    constraints.max
                        |> Maybe.map toMM
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if toMM x <= m then
                                            Ok x

                                        else
                                            Err (AboveMax m)
                                    )
                            )
                        |> Maybe.withDefault identity
            in
            String.toFloat text
                |> Maybe.map mm
                |> Result.fromMaybe NotALength
                |> min
                |> max


parseBool : String -> Result Error Bool
parseBool text =
    case text of
        "true" ->
            Ok True

        "false" ->
            Ok False

        _ ->
            Err NotABool


parseColorSchema : String -> Result Error ColorSchema
parseColorSchema text =
    case text of
        "white-on-black" ->
            Ok WhiteOnBlack

        "black-on-white" ->
            Ok BlackOnWhite

        _ ->
            Err (NonexistentVariant text)