use std::collections::HashMap;

/// A data card's model.
/// Cards of one model can be sorted, searched and filtered by their fields.
#[derive(Serialize, Deserialize, Debug)]
pub struct Model {
    /// Fields defined by this model
    pub fields: HashMap<String, Field>,
}

/// One field of a model
#[derive(Serialize, Deserialize, Debug)]
pub struct Field {
    /// Field label shown in the user interface
    #[serde(default)]
    pub label: String,
    /// Field data type
    #[serde(flatten)]
    pub kind: FieldKind,
}

/// Field data type and validations
#[derive(Serialize, Deserialize, Debug)]
#[serde(tag = "type")]
#[serde(rename_all = "snake_case")]
pub enum FieldKind {
    /// Single-line text entry
    String,

    /// Long-form text entry, can have multiple rows
    Text,

    /// Checkbox or a toggle switch
    Bool {
        /// Default value when the model's card is created
        #[serde(default)]
        default: bool,
    },

    /// Integer entry
    Int {
        /// Lowest allowed value
        #[serde(default)]
        min: Option<i64>,
        /// Highest allowed value
        #[serde(default)]
        max: Option<i64>,
        /// Default value
        #[serde(default)]
        default: i64,
    },

    /// Floating point entry
    Float {
        /// Lowest allowed value
        #[serde(default)]
        min: Option<f64>,
        /// Highest allowed value
        #[serde(default)]
        max: Option<f64>,
        /// Default value
        #[serde(default)]
        default: f64,
    },

    /// Enumeration entry with a fixed set of options
    Enum {
        /// Options to choose from, must not be empty
        options: Vec<String>,
        /// Default option (if not the first)
        #[serde(default)]
        default: Option<String>,
    },

    /// Enum that can be freely expanded by the user
    FreeEnum {
        /// Group name.
        /// If not set, a private group for this particular field is used.
        #[serde(default)]
        enum_group: Option<String>,
    },

    /// Tags with a fixed set of options to choose from
    Tags {
        /// Options to choose from
        options: Vec<String>,
    },

    /// Tags that can be freely added by the user
    FreeTags {
        /// Group name.
        /// If not set, a private group for this particular field is used.
        #[serde(default)]
        tag_group: Option<String>,
    },
}