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use std::collections::BTreeMap;

use super::{v1, *};

impl From<v1::StandardLibrary> for StandardLibrary {
    fn from(mut v1: v1::StandardLibrary) -> Self {
        let mut standard_library = StandardLibrary::default();

        if let Some(meta) = v1.meta.take() {
            standard_library.base = meta.base;
            standard_library.name = meta.name;

            if let Some(v1_structs) = meta.structs {
                for (name, children) in v1_structs {
                    let mut struct_fields = BTreeMap::new();

                    for (name, v1_struct_field) in children {
                        struct_fields.extend(unpack_v1_field(name, v1_struct_field));
                    }

                    standard_library.structs.insert(name, struct_fields);
                }
            }
        }

        let mut globals = BTreeMap::new();

        for (name, v1_global) in v1.globals {
            globals.extend(unpack_v1_field(name, v1_global));
        }

        standard_library.globals = globals;

        standard_library
    }
}

impl From<v1::Argument> for Argument {
    fn from(v1_argument: v1::Argument) -> Self {
        Argument {
            required: v1_argument.required.into(),
            argument_type: v1_argument.argument_type.into(),
            observes: Observes::ReadWrite,
            deprecated: None,
        }
    }
}

impl From<v1::ArgumentType> for ArgumentType {
    fn from(v1_argument_type: v1::ArgumentType) -> Self {
        match v1_argument_type {
            v1::ArgumentType::Any => ArgumentType::Any,
            v1::ArgumentType::Bool => ArgumentType::Bool,
            v1::ArgumentType::Constant(constants) => ArgumentType::Constant(constants),
            v1::ArgumentType::Display(message) => ArgumentType::Display(message),
            v1::ArgumentType::Function => ArgumentType::Function,
            v1::ArgumentType::Nil => ArgumentType::Nil,
            v1::ArgumentType::Number => ArgumentType::Number,
            v1::ArgumentType::String => ArgumentType::String,
            v1::ArgumentType::Table => ArgumentType::Table,
            v1::ArgumentType::Vararg => ArgumentType::Vararg,
        }
    }
}

fn unpack_v1_field(name: String, v1_field: v1::Field) -> BTreeMap<String, Field> {
    let mut upgraded_fields = BTreeMap::new();
    let mut v1_fields = vec![(name, v1_field)];

    while let Some((name, field)) = v1_fields.pop() {
        match field {
            v1::Field::Any => {
                upgraded_fields.insert(name, Field::from_field_kind(FieldKind::Any));
            }

            v1::Field::Complex { function, table } => {
                for (child_name, child_field) in table {
                    v1_fields.push((format!("{name}.{child_name}").to_owned(), child_field));
                }

                if let Some(function) = function {
                    upgraded_fields.insert(
                        name,
                        Field::from_field_kind(FieldKind::Function(FunctionBehavior {
                            arguments: function.arguments.into_iter().map(Into::into).collect(),
                            method: function.method,
                            must_use: false,
                        })),
                    );
                }
            }

            v1::Field::Property { writable } => {
                upgraded_fields.insert(
                    name,
                    Field::from_field_kind(FieldKind::Property(writable.into())),
                );
            }

            v1::Field::Struct(struct_name) => {
                upgraded_fields
                    .insert(name, Field::from_field_kind(FieldKind::Struct(struct_name)));
            }

            v1::Field::Removed => {
                upgraded_fields.insert(name, Field::from_field_kind(FieldKind::Removed));
            }
        }
    }

    upgraded_fields
}

impl From<Option<v1::Writable>> for PropertyWritability {
    fn from(v1_writable: Option<v1::Writable>) -> Self {
        match v1_writable {
            Some(v1::Writable::Full) => PropertyWritability::FullWrite,
            Some(v1::Writable::NewFields) => PropertyWritability::NewFields,
            Some(v1::Writable::Overridden) => PropertyWritability::OverrideFields,
            None => PropertyWritability::ReadOnly,
        }
    }
}

impl From<v1::Required> for Required {
    fn from(v1_required: v1::Required) -> Self {
        match v1_required {
            v1::Required::NotRequired => Required::NotRequired,
            v1::Required::Required(message) => Required::Required(message),
        }
    }
}