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use std::collections::HashMap;

use super::ursa_cl::{CredentialSignature, RevocationRegistry, SignatureCorrectnessProof, Witness};
use crate::identifiers::cred_def::CredentialDefinitionId;
use crate::identifiers::rev_reg::RevocationRegistryId;
use crate::identifiers::schema::SchemaId;
use crate::{EmbedJson, Validatable, ValidationError};

#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct Credential {
    pub schema_id: SchemaId,
    pub cred_def_id: CredentialDefinitionId,
    pub rev_reg_id: Option<RevocationRegistryId>,
    pub values: CredentialValues,
    pub signature: EmbedJson<CredentialSignature>,
    pub signature_correctness_proof: EmbedJson<SignatureCorrectnessProof>,
    pub rev_reg: Option<EmbedJson<RevocationRegistry>>,
    pub witness: Option<EmbedJson<Witness>>,
}

impl Credential {
    pub const QUALIFIABLE_TAGS: [&'static str; 5] = [
        "issuer_did",
        "cred_def_id",
        "schema_id",
        "schema_issuer_did",
        "rev_reg_id",
    ];
}

impl Validatable for Credential {
    fn validate(&self) -> Result<(), ValidationError> {
        self.schema_id.validate()?;
        self.cred_def_id.validate()?;
        self.values.validate()?;

        if self.rev_reg_id.is_some() && (self.witness.is_none() || self.rev_reg.is_none()) {
            return Err("Credential validation failed: `witness` and `rev_reg` must be passed for revocable Credential".into());
        }

        if self.values.0.is_empty() {
            return Err("Credential validation failed: `values` is empty".into());
        }

        Ok(())
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct CredentialInfo {
    pub referent: String,
    pub attrs: ShortCredentialValues,
    pub schema_id: SchemaId,
    pub cred_def_id: CredentialDefinitionId,
    pub rev_reg_id: Option<RevocationRegistryId>,
    pub cred_rev_id: Option<String>,
}

pub type ShortCredentialValues = HashMap<String, String>;

#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct CredentialValues(pub HashMap<String, AttributeValues>);

#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct AttributeValues {
    pub raw: String,
    pub encoded: String,
}

impl Validatable for CredentialValues {
    fn validate(&self) -> Result<(), ValidationError> {
        if self.0.is_empty() {
            return Err("CredentialValues validation failed: empty list has been passed".into());
        }

        Ok(())
    }
}