"""A presentation preview inner object."""

from enum import Enum
from time import time
from typing import Mapping, Sequence

from marshmallow import EXCLUDE, fields

from ...core.profile import Profile
from ...ledger.multiple_ledger.ledger_requests_executor import (
    GET_CRED_DEF,
    IndyLedgerRequestsExecutor,
)
from ...messaging.models.base import BaseModel, BaseModelSchema
from ...messaging.util import canon
from ...messaging.valid import (
    INDY_CRED_DEF_ID_EXAMPLE,
    INDY_CRED_DEF_ID_VALIDATE,
    INDY_PREDICATE_EXAMPLE,
    INDY_PREDICATE_VALIDATE,
)
from ...multitenant.base import BaseMultitenantManager
from ...protocols.didcomm_prefix import DIDCommPrefix
from ...wallet.util import b64_to_str
from ..util import generate_pr_nonce
from .non_rev_interval import IndyNonRevocationInterval
from .predicate import Predicate

PRESENTATION_PREVIEW = "present-proof/1.0/presentation-preview"  # message type


class IndyPresPredSpec(BaseModel):
    """Class representing a predicate specification within a presentation preview."""

    class Meta:
        """Pred spec metadata."""

        schema_class = "IndyPresPredSpecSchema"

    def __init__(
        self,
        name: str,
        *,
        cred_def_id: str = None,
        predicate: str,
        threshold: int,
        **kwargs,
    ):
        """Initialize  preview object.

        Args:
            name: attribute name
            cred_def_id: credential definition identifier
            predicate: predicate type (e.g., ">=")
            threshold: threshold value

        """
        super().__init__(**kwargs)
        self.name = name
        self.cred_def_id = cred_def_id
        self.predicate = predicate
        self.threshold = threshold

    def __eq__(self, other):
        """Equality comparator."""

        if canon(self.name) != canon(other.name):
            return False  # distinct attribute names modulo canonicalization

        if self.cred_def_id != other.cred_def_id:
            return False

        if self.predicate != other.predicate:
            return False

        return self.threshold == other.threshold


class IndyPresPredSpecSchema(BaseModelSchema):
    """Predicate specifiation schema."""

    class Meta:
        """Predicate specifiation schema metadata."""

        model_class = IndyPresPredSpec
        unknown = EXCLUDE

    name = fields.Str(
        required=True,
        metadata={"description": "Attribute name", "example": "high_score"},
    )
    cred_def_id = fields.Str(
        required=False,
        validate=INDY_CRED_DEF_ID_VALIDATE,
        metadata={
            "description": "Credential definition identifier",
            "example": INDY_CRED_DEF_ID_EXAMPLE,
        },
    )
    predicate = fields.Str(
        required=True,
        validate=INDY_PREDICATE_VALIDATE,
        metadata={
            "description": "Predicate type ('<', '<=', '>=', or '>')",
            "example": INDY_PREDICATE_EXAMPLE,
        },
    )
    threshold = fields.Int(
        required=True, metadata={"description": "Threshold value", "strict": True}
    )


class IndyPresAttrSpec(BaseModel):
    """Class representing an attibute specification within a presentation preview."""

    class Meta:
        """Attr spec metadata."""

        schema_class = "IndyPresAttrSpecSchema"

    class Posture(Enum):
        """Attribute posture: self-attested, revealed claim or unrevealed claim."""

        SELF_ATTESTED = 0
        REVEALED_CLAIM = 1
        UNREVEALED_CLAIM = 2

    def __init__(
        self,
        name: str,
        cred_def_id: str = None,
        mime_type: str = None,
        value: str = None,
        referent: str = None,
        **kwargs,
    ):
        """Initialize attribute specification object.

        Args:
            name: attribute name
            cred_def_id: credential definition identifier
                (None for self-attested attribute)
            mime_type: MIME type
            value: attribute value as credential stores it
                (None for unrevealed attribute)
            referent: credential referent

        """
        super().__init__(**kwargs)
        self.name = name
        self.cred_def_id = cred_def_id
        self.mime_type = mime_type.lower() if mime_type else None
        self.value = value
        self.referent = referent

    @staticmethod
    def list_plain(plain: dict, cred_def_id: str, referent: str = None):
        """Return a list of `IndyPresAttrSpec` on input cred def id.

        Args:
            plain: dict mapping names to values
            cred_def_id: credential definition identifier to specify
            referent: single referent to use, omit for none

        Returns:
            List of IndyPresAttrSpec on input cred def id with no MIME types

        """
        return [
            IndyPresAttrSpec(
                name=k, cred_def_id=cred_def_id, value=plain[k], referent=referent
            )
            for k in plain
        ]

    @property
    def posture(self) -> "IndyPresAttrSpec.Posture":
        """Attribute posture: self-attested, revealed claim, or unrevealed claim."""

        if self.cred_def_id:
            if self.value:
                return IndyPresAttrSpec.Posture.REVEALED_CLAIM
            return IndyPresAttrSpec.Posture.UNREVEALED_CLAIM
        if self.value:
            return IndyPresAttrSpec.Posture.SELF_ATTESTED

        return None

    def b64_decoded_value(self) -> str:
        """Value, base64-decoded if applicable."""

        return b64_to_str(self.value) if self.value and self.mime_type else self.value

    def satisfies(self, pred_spec: IndyPresPredSpec):
        """Whether current specified attribute satisfies input specified predicate."""

        return bool(
            self.value
            and not self.mime_type
            and canon(self.name) == canon(pred_spec.name)
            and not pred_spec.cred_def_id
            or (self.cred_def_id == pred_spec.cred_def_id)
            and Predicate.get(pred_spec.predicate).value.yes(
                self.value, pred_spec.threshold
            )
        )

    def __eq__(self, other):
        """Equality comparator."""

        if canon(self.name) != canon(other.name):
            return False  # distinct attribute names

        if self.cred_def_id != other.cred_def_id:
            return False  # distinct attribute cred def ids

        if self.mime_type != other.mime_type:
            return False  # distinct MIME types

        if self.referent != other.referent:
            return False  # distinct credential referents

        return self.b64_decoded_value() == other.b64_decoded_value()


class IndyPresAttrSpecSchema(BaseModelSchema):
    """Attribute specifiation schema."""

    class Meta:
        """Attribute specifiation schema metadata."""

        model_class = IndyPresAttrSpec
        unknown = EXCLUDE

    name = fields.Str(
        required=True,
        metadata={"description": "Attribute name", "example": "favourite_drink"},
    )
    cred_def_id = fields.Str(
        required=False,
        validate=INDY_CRED_DEF_ID_VALIDATE,
        metadata={"example": INDY_CRED_DEF_ID_EXAMPLE},
    )
    mime_type = fields.Str(
        required=False,
        data_key="mime-type",
        metadata={"description": "MIME type (default null)", "example": "image/jpeg"},
    )
    value = fields.Str(
        required=False,
        metadata={"description": "Attribute value", "example": "martini"},
    )
    referent = fields.Str(
        required=False, metadata={"description": "Credential referent", "example": "0"}
    )


class IndyPresPreview(BaseModel):
    """Class representing presentation preview."""

    class Meta:
        """Presentation preview metadata."""

        schema_class = "IndyPresPreviewSchema"
        message_type = PRESENTATION_PREVIEW

    def __init__(
        self,
        *,
        _type: str = None,
        attributes: Sequence[IndyPresAttrSpec] = None,
        predicates: Sequence[IndyPresPredSpec] = None,
        **kwargs,
    ):
        """Initialize presentation preview object.

        Args:
            _type: formalism for Marshmallow model creation: ignored
            attributes: list of attribute specifications
            predicates: list of predicate specifications

        """
        super().__init__(**kwargs)
        self.attributes = list(attributes) if attributes else []
        self.predicates = list(predicates) if predicates else []

    @property
    def _type(self):
        """Accessor for message type."""

        return DIDCommPrefix.qualify_current(IndyPresPreview.Meta.message_type)

    def has_attr_spec(self, cred_def_id: str, name: str, value: str) -> bool:
        """Return whether preview contains given attribute specification.

        Args:
            cred_def_id: credential definition identifier
            name: attribute name
            value: attribute value

        Returns:
            Whether preview contains matching attribute specification.

        """

        return any(
            canon(a.name) == canon(name)
            and a.value in (value, None)
            and a.cred_def_id == cred_def_id
            for a in self.attributes
        )

    async def indy_proof_request(
        self,
        profile: Profile = None,
        name: str = None,
        version: str = None,
        nonce: str = None,
        non_revoc_intervals: Mapping[str, IndyNonRevocationInterval] = None,
    ) -> dict:
        """Return indy proof request corresponding to presentation preview.

        Typically the verifier turns the proof preview into a proof request.

        Args:
            name: for proof request
            version: version for proof request
            nonce: nonce for proof request
            ledger: ledger with credential definitions, to check for revocation support
            non_revoc_intervals: non-revocation interval to use per cred def id
                where applicable (default from and to the current time if applicable)

        Returns:
            Indy proof request dict.

        """

        def non_revoc(cred_def_id: str) -> IndyNonRevocationInterval:
            """Non-revocation interval to use for input cred def id."""

            nonlocal epoch_now
            nonlocal non_revoc_intervals

            return (non_revoc_intervals or {}).get(
                cred_def_id, IndyNonRevocationInterval(epoch_now, epoch_now)
            )

        epoch_now = int(time())
        ledger = None
        proof_req = {
            "name": name or "proof-request",
            "version": version or "1.0",
            "nonce": nonce or await generate_pr_nonce(),
            "requested_attributes": {},
            "requested_predicates": {},
        }

        attr_specs_names = {}
        for attr_spec in self.attributes:
            if attr_spec.posture == IndyPresAttrSpec.Posture.SELF_ATTESTED:
                proof_req["requested_attributes"][
                    "self_{}_uuid".format(canon(attr_spec.name))
                ] = {"name": attr_spec.name}
                continue

            cd_id = attr_spec.cred_def_id
            revoc_support = False
            if cd_id:
                if profile:
                    multitenant_mgr = profile.inject_or(BaseMultitenantManager)
                    if multitenant_mgr:
                        ledger_exec_inst = IndyLedgerRequestsExecutor(profile)
                    else:
                        ledger_exec_inst = profile.inject(IndyLedgerRequestsExecutor)
                    ledger = (
                        await ledger_exec_inst.get_ledger_for_identifier(
                            cd_id,
                            txn_record_type=GET_CRED_DEF,
                        )
                    )[1]
                if ledger:
                    async with ledger:
                        revoc_support = (await ledger.get_credential_definition(cd_id))[
                            "value"
                        ].get("revocation")
                interval = non_revoc(cd_id) if revoc_support else None

            if attr_spec.referent:
                if attr_spec.referent in attr_specs_names:
                    attr_specs_names[attr_spec.referent]["names"].append(attr_spec.name)
                else:
                    attr_specs_names[attr_spec.referent] = {
                        "names": [attr_spec.name],
                        **{
                            "restrictions": [{"cred_def_id": cd_id}]
                            for _ in [""]
                            if cd_id
                        },
                        **{
                            "non_revoked": interval.serialize()
                            for _ in [""]
                            if revoc_support
                        },
                    }
            else:
                proof_req["requested_attributes"][
                    "{}_{}_uuid".format(
                        len(proof_req["requested_attributes"]),
                        canon(attr_spec.name),
                    )
                ] = {
                    "name": attr_spec.name,
                    **{"restrictions": [{"cred_def_id": cd_id}] for _ in [""] if cd_id},
                    **{
                        "non_revoked": interval.serialize()
                        for _ in [""]
                        if revoc_support
                    },
                }

        for reft, attr_spec in attr_specs_names.items():
            proof_req["requested_attributes"][
                "{}_{}_uuid".format(
                    len(proof_req["requested_attributes"]), canon(attr_spec["names"][0])
                )
            ] = attr_spec

        for pred_spec in self.predicates:
            cd_id = pred_spec.cred_def_id
            revoc_support = False
            if cd_id:
                if profile:
                    multitenant_mgr = profile.inject_or(BaseMultitenantManager)
                    if multitenant_mgr:
                        ledger_exec_inst = IndyLedgerRequestsExecutor(profile)
                    else:
                        ledger_exec_inst = profile.inject(IndyLedgerRequestsExecutor)
                    ledger = (
                        await ledger_exec_inst.get_ledger_for_identifier(
                            cd_id,
                            txn_record_type=GET_CRED_DEF,
                        )
                    )[1]
                if ledger:
                    async with ledger:
                        revoc_support = (await ledger.get_credential_definition(cd_id))[
                            "value"
                        ].get("revocation")
                interval = non_revoc(cd_id) if revoc_support else None

            proof_req["requested_predicates"][
                "{}_{}_{}_uuid".format(
                    len(proof_req["requested_predicates"]),
                    canon(pred_spec.name),
                    Predicate.get(pred_spec.predicate).value.fortran,
                )
            ] = {
                "name": pred_spec.name,
                "p_type": pred_spec.predicate,
                "p_value": pred_spec.threshold,
                **{"restrictions": [{"cred_def_id": cd_id}] for _ in [""] if cd_id},
                **{"non_revoked": interval.serialize() for _ in [""] if revoc_support},
            }

        return proof_req

    def __eq__(self, other):
        """Equality comparator."""

        for part in vars(self):
            if getattr(self, part, None) != getattr(other, part, None):
                return False
        return True


class IndyPresPreviewSchema(BaseModelSchema):
    """Presentation preview schema."""

    class Meta:
        """Presentation preview schema metadata."""

        model_class = IndyPresPreview
        unknown = EXCLUDE

    _type = fields.Str(
        required=False,
        data_key="@type",
        metadata={
            "description": "Message type identifier",
            "example": DIDCommPrefix.qualify_current(PRESENTATION_PREVIEW),
        },
    )
    attributes = fields.Nested(IndyPresAttrSpecSchema, required=True, many=True)
    predicates = fields.Nested(IndyPresPredSpecSchema, required=True, many=True)
