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use super::{
    locate_fragments::LocateFragments,
    rules::ValidationRule,
    utils::{ValidationContext, ValidationError},
};

use crate::{
    ast::TypeInfoRegistry,
    static_graphql::{query, schema},
};

pub struct ValidationPlan {
    pub rules: Vec<Box<dyn ValidationRule>>,
}

impl ValidationPlan {
    pub fn new() -> Self {
        Self { rules: vec![] }
    }

    pub fn from(rules: Vec<Box<dyn ValidationRule>>) -> Self {
        Self { rules }
    }

    pub fn add_rule(&mut self, rule: Box<dyn ValidationRule>) {
        self.rules.push(rule);
    }
}

pub fn validate<'a>(
    schema: &'a schema::Document,
    operation: &'a query::Document,
    validation_plan: &'a ValidationPlan,
) -> Vec<ValidationError> {
    let mut fragments_locator = LocateFragments::new();
    let fragments = fragments_locator.locate_fragments(&operation);

    let type_info_registry = TypeInfoRegistry::new(schema);
    let validation_context = ValidationContext {
        operation: operation.clone(),
        schema: schema.clone(),
        fragments,
        type_info_registry: Some(type_info_registry),
    };

    let validation_errors = validation_plan
        .rules
        .iter()
        .flat_map(|rule| rule.validate(&validation_context))
        .collect::<Vec<_>>();

    validation_errors
}

#[test]
fn cyclic_fragment_should_never_loop() {
    use crate::validation::test_utils::*;
    use crate::validation::rules::default_rules_validation_plan;

    let mut default_plan = default_rules_validation_plan();
    let errors = test_operation_with_schema(
        "
        {
          dog {
            nickname
            ...bark
            ...parents
          }
        }
        
        fragment bark on Dog {
          barkVolume
          ...parents
        }
        
        fragment parents on Dog {
          mother {
            ...bark
          }
        }
        
    ",
    TEST_SCHEMA,
        &mut default_plan,
    );

    let messages = get_messages(&errors);
    assert_eq!(messages.len(), 1);
    assert_eq!(messages, vec![
      "Cannot spread fragment \"bark\" within itself via \"parents\"."
    ])
}

#[test]
fn simple_self_reference_fragment_should_not_loop() {
    use crate::validation::test_utils::*;
    use crate::validation::rules::default_rules_validation_plan;

    let mut default_plan = default_rules_validation_plan();
    let errors = test_operation_with_schema(
        "
        query dog {
          dog {
            ...DogFields
          }
        }
        
        fragment DogFields on Dog {
          mother {
            ...DogFields
          }
          father {
            ...DogFields
          }
        }
    ",
    TEST_SCHEMA,
        &mut default_plan,
    );

    let messages = get_messages(&errors);
    assert_eq!(messages.len(), 2);
    assert_eq!(messages, vec![
      "Cannot spread fragment \"DogFields\" within itself.",
      "Cannot spread fragment \"DogFields\" within itself."
    ])
}

#[test]
fn fragment_loop_through_multiple_frags() {
    use crate::validation::test_utils::*;
    use crate::validation::rules::default_rules_validation_plan;

    let mut default_plan = default_rules_validation_plan();
    let errors = test_operation_with_schema(
        "
        query dog {
          dog {
            ...DogFields1
          }
        }
        
        fragment DogFields1 on Dog {
          barks
          ...DogFields2
        }

        fragment DogFields2 on Dog {
          barkVolume
          ...DogFields3
        }

        fragment DogFields3 on Dog {
          name
          ...DogFields1
        }
    ",
    TEST_SCHEMA,
        &mut default_plan,
    );

    let messages = get_messages(&errors);
    assert_eq!(messages.len(), 1);
    assert_eq!(messages, vec![
      "Cannot spread fragment \"DogFields1\" within itself via \"DogFields2\", \"DogFields3\"."
    ])
}