# =============================================================================
#               ____ _   _ ____  _          _
#  _ __  _   _ / ___| | | |  _ \| |      __| | ___  _ __ ___
# | '_ \| | | | |  _| |_| | | | | |     / _` |/ _ \| '_ ` _ \
# | |_) | |_| | |_| |  _  | |_| | |___ | (_| | (_) | | | | | |
# | .__/ \__, |\____|_| |_|____/|_____(_)__,_|\___/|_| |_| |_|
# |_|    |___/
# =============================================================================
# Authors:
#   Patrick Lehmann
#
# Package module:   A pretty printer to format the DOM as a tree in text form.
#
# License:
# ============================================================================
#  Copyright (C) 2019-2021 Tristan Gingold
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-2.0-or-later
# ============================================================================
from typing import List, Union

from pyTooling.Decorators import export

from pyGHDL.dom.Concurrent import (
    ConcurrentBlockStatement,
    ProcessStatement,
    IfGenerateStatement,
    CaseGenerateStatement,
    ForGenerateStatement,
    ComponentInstantiation,
    ConfigurationInstantiation,
    EntityInstantiation,
    ConcurrentProcedureCall,
)
from pyVHDLModel.SyntaxModel import (
    GenericInterfaceItem,
    NamedEntity,
    PortInterfaceItem,
    WithDefaultExpressionMixin,
    Function,
    BaseType,
    FullType,
    BaseConstant,
    ConcurrentStatement,
)

from pyGHDL import GHDLBaseException
from pyGHDL.dom.NonStandard import Document, Design, Library
from pyGHDL.dom.DesignUnit import (
    Entity,
    Architecture,
    Package,
    PackageBody,
    Configuration,
    Context,
    Component,
    UseClause,
    PackageInstantiation,
)
from pyGHDL.dom.Symbol import (
    SimpleSubtypeSymbol,
    ConstrainedCompositeSubtypeSymbol,
)
from pyGHDL.dom.Type import (
    IntegerType,
    Subtype,
    ArrayType,
    RecordType,
    AccessType,
    EnumeratedType,
    FileType,
    ProtectedType,
    ProtectedTypeBody,
    PhysicalType,
    IncompleteType,
)
from pyGHDL.dom.InterfaceItem import (
    GenericConstantInterfaceItem,
    PortSignalInterfaceItem,
    GenericTypeInterfaceItem,
)
from pyGHDL.dom.Object import Constant, Signal, SharedVariable, File
from pyGHDL.dom.Attribute import Attribute, AttributeSpecification
from pyGHDL.dom.Subprogram import Procedure
from pyGHDL.dom.Misc import Alias
from pyGHDL.dom.PSL import DefaultClock


StringBuffer = List[str]


@export
class PrettyPrintException(GHDLBaseException):
    pass


@export
class PrettyPrint:
    # _buffer: StringBuffer
    #
    # def __init__(self):
    #     self._buffer = []

    def formatDesign(self, design: Design, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}Libraries:")
        for library in design.Libraries.values():
            buffer.append(f"{prefix}  - Name: {library.Identifier}")
            for line in self.formatLibrary(library, level + 2):
                buffer.append(line)
        buffer.append(f"{prefix}Documents:")
        for document in design.Documents:
            buffer.append(f"{prefix}  - Path: '{document.Path!s}':")
            for line in self.formatDocument(document, level + 2):
                buffer.append(line)

        return buffer

    def formatLibrary(self, library: Library, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}Entities:")
        for entity in library.Entities:
            buffer.append(f"{prefix}  - {entity.Identifier}({', '.join([a.Identifier for a in entity.Architectures])})")
        buffer.append(f"{prefix}Packages:")
        for package in library.Packages:
            if isinstance(package, Package):
                buffer.append(f"{prefix}  - {package.Identifier}")
            elif isinstance(package, PackageInstantiation):
                buffer.append(f"{prefix}  - {package.Identifier} instantiate from {package.PackageReference}")
        buffer.append(f"{prefix}Configurations:")
        for configuration in library.Configurations:
            buffer.append(f"{prefix}  - {configuration.Identifier}")
        buffer.append(f"{prefix}Contexts:")
        for context in library.Contexts:
            buffer.append(f"{prefix}  - {context.Identifier}")

        return buffer

    def formatDocument(self, document: Document, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}Entities:")
        for entity in document.Entities:
            for line in self.formatEntity(entity, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}Architectures:")
        for architecture in document.Architectures:
            for line in self.formatArchitecture(architecture, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}Packages:")
        for package in document.Packages:
            if isinstance(package, Package):
                gen = self.formatPackage
            else:
                gen = self.formatPackageInstance

            for line in gen(package, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}PackageBodies:")
        for packageBodies in document.PackageBodies:
            for line in self.formatPackageBody(packageBodies, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}Configurations:")
        for configuration in document.Configurations:
            for line in self.formatConfiguration(configuration, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}Contexts:")
        for context in document.Contexts:
            for line in self.formatContext(context, level + 1):
                buffer.append(line)

        return buffer

    def formatEntity(self, entity: Entity, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {entity.Identifier}\n{prefix}  File: {entity.Position.Filename.name}\n{prefix}  Position: {entity.Position.Line}:{entity.Position.Column}")
        buffer.append(f"{prefix}  Generics:")
        for generic in entity.GenericItems:
            for line in self.formatGeneric(generic, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}  Ports:")
        for port in entity.PortItems:
            for line in self.formatPort(port, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}  Declared:")
        for item in entity.DeclaredItems:
            for line in self.formatDeclaredItems(item, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}  Statements:")
        for item in entity.Statements:
            buffer.append(f"{prefix}    ...")
        buffer.append(f"{prefix}  Architectures:")
        for item in entity.Architectures:
            buffer.append(f"{prefix}  - {item.Identifier}")

        return buffer

    def formatArchitecture(self, architecture: Architecture, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {architecture.Identifier}\n{prefix}  File: {architecture.Position.Filename.name}\n{prefix}  Position: {architecture.Position.Line}:{architecture.Position.Column}")
        buffer.append(f"{prefix}  Entity: {architecture.Entity.SymbolName}")
        buffer.append(f"{prefix}  Declared:")
        for item in architecture.DeclaredItems:
            for line in self.formatDeclaredItems(item, level + 2):
                buffer.append(line)
        buffer.append(f"{prefix}  Hierarchy:")
        for item in architecture.Statements:
            for line in self.formatHierarchy(item, level + 2):
                buffer.append(line)
        buffer.append(f"{prefix}  Statements:")
        for item in architecture.Statements:
            buffer.append(f"{prefix}    ...")
        #            for line in self.formatStatements(item, level + 2):
        #                buffer.append(line)

        return buffer

    def formatComponent(self, component: Component, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Component: {component.Identifier}")
        buffer.append(f"{prefix}  Generics:")
        for generic in component.GenericItems:
            for line in self.formatGeneric(generic, level + 1):
                buffer.append(line)
        buffer.append(f"{prefix}  Ports:")
        for port in component.PortItems:
            for line in self.formatPort(port, level + 1):
                buffer.append(line)

        return buffer

    def formatPackage(self, package: Package, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {package.Identifier}\n{prefix}  File: {package.Position.Filename.name}\n{prefix}  Position: {package.Position.Line}:{package.Position.Column}")
        buffer.append(f"{prefix}  Declared:")
        for item in package.DeclaredItems:
            for line in self.formatDeclaredItems(item, level + 1):
                buffer.append(line)

        return buffer

    def formatPackageInstance(self, package: PackageInstantiation, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {package.Identifier}")
        buffer.append(f"{prefix}  Package: {package.PackageReference!s}")
        buffer.append(f"{prefix}  Generic Map: ...")
        #        for item in package.GenericItems:
        #            for line in self.formatGeneric(item, level + 1):
        #                buffer.append(line)

        return buffer

    def formatPackageBody(self, packageBody: PackageBody, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {packageBody.Identifier}")
        buffer.append(f"{prefix}  Declared:")
        for item in packageBody.DeclaredItems:
            for line in self.formatDeclaredItems(item, level + 1):
                buffer.append(line)

        return buffer

    def formatConfiguration(self, configuration: Configuration, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {configuration.Identifier}")

        return buffer

    def formatContext(self, context: Context, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level
        buffer.append(f"{prefix}- Name: {context.Identifier}")

        return buffer

    def formatGeneric(self, generic: Union[NamedEntity, GenericInterfaceItem], level: int = 0) -> StringBuffer:
        if isinstance(generic, GenericConstantInterfaceItem):
            return self.formatGenericConstant(generic, level)
        elif isinstance(generic, GenericTypeInterfaceItem):
            return self.formatGenericType(generic, level)
        else:
            raise PrettyPrintException(f"Unhandled generic kind '{generic.__class__.__name__}' for generic '{generic.Identifiers[0]}'.")

    def formatPort(self, port: Union[NamedEntity, PortInterfaceItem], level: int = 0) -> StringBuffer:
        if isinstance(port, PortSignalInterfaceItem):
            return self.formatPortSignal(port, level)
        else:
            raise PrettyPrintException(f"Unhandled port kind '{port.__class__.__name__}' for port '{port.Identifiers[0]}'.")

    def formatGenericConstant(self, generic: GenericConstantInterfaceItem, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level

        buffer.append(
            "{prefix}  - {name} : {mode!s} {subtypeindication}{initialValue}".format(
                prefix=prefix,
                name=", ".join(generic.Identifiers),
                mode=generic.Mode,
                subtypeindication=self.formatSubtypeIndication(generic.Subtype, "generic", generic.Identifiers[0]),
                initialValue=self.formatInitialValue(generic),
            )
        )

        return buffer

    def formatGenericType(self, generic: GenericConstantInterfaceItem, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level

        buffer.append(f"{prefix}  - type {generic.Identifier}")

        return buffer

    def formatPortSignal(self, port: PortSignalInterfaceItem, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level

        buffer.append(
            "{prefix}  - {name} : {mode!s} {subtypeindication}{initialValue}".format(
                prefix=prefix,
                name=", ".join(port.Identifiers),
                mode=port.Mode,
                subtypeindication=self.formatSubtypeIndication(port.Subtype, "port", port.Identifiers[0]),
                initialValue=self.formatInitialValue(port),
            )
        )

        return buffer

    def formatDeclaredItems(self, item, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level

        if isinstance(item, BaseConstant):
            if isinstance(item, Constant):
                default = f" := {item.DefaultExpression!s}"
            else:
                default = ""

            buffer.append(
                "{prefix}- constant {name} : {subtype}{default}".format(
                    prefix=prefix,
                    name=", ".join(item.Identifiers),
                    subtype=self.formatSubtypeIndication(item.Subtype, "constant", item.Identifiers[0]),
                    default=default,
                )
            )
        elif isinstance(item, SharedVariable):
            buffer.append(
                "{prefix}- shared variable {name} : {subtype}".format(
                    prefix=prefix,
                    name=", ".join(item.Identifiers),
                    subtype=self.formatSubtypeIndication(item.Subtype, "shared variable", item.Identifiers[0]),
                )
            )
        elif isinstance(item, Signal):
            buffer.append(
                "{prefix}- signal {name} : {subtype}{initValue}".format(
                    prefix=prefix,
                    name=", ".join(item.Identifiers),
                    subtype=self.formatSubtypeIndication(item.Subtype, "signal", item.Identifiers[0]),
                    initValue=f" := {item.DefaultExpression!s}"
                    if item.DefaultExpression is not None
                    else "",
                )
            )
        elif isinstance(item, File):
            buffer.append(
                "{prefix}- File {name} : {subtype}".format(
                    prefix=prefix,
                    name=", ".join(item.Identifiers),
                    subtype=self.formatSubtypeIndication(item.Subtype, "file", item.Identifiers[0]),
                )
            )
        elif isinstance(item, (FullType, IncompleteType)):
            buffer.append(f"{prefix}- {self.formatType(item)}")
        elif isinstance(item, Subtype):
            buffer.append(f"{prefix}- subtype {item.Identifier} is ?????")
        elif isinstance(item, Alias):
            buffer.append(f"{prefix}- alias {item.Identifier} is ?????")
        elif isinstance(item, Function):
            buffer.append(f"{prefix}- function {item.Identifier} return {item.ReturnType!s}")
        elif isinstance(item, Procedure):
            buffer.append(f"{prefix}- procedure {item.Identifier}")
        elif isinstance(item, Component):
            for line in self.formatComponent(item, level):
                buffer.append(line)
        elif isinstance(item, Attribute):
            buffer.append(f"{prefix}- attribute {item.Identifier} : {item.Subtype!s}")
        elif isinstance(item, AttributeSpecification):
            buffer.append(f"{prefix}- attribute {item.Attribute!s} of {'????'} : {'????'} is {'????'}")
        elif isinstance(item, UseClause):
            buffer.append("{prefix}- use {names}".format(prefix=prefix, names=", ".join([str(n) for n in item.Names])))
        elif isinstance(item, Package):
            buffer.append(f"{prefix}- package {item.Identifier} is ..... end package")
        elif isinstance(item, PackageInstantiation):
            buffer.append(f"{prefix}- package {item.Identifier} is new {item.PackageReference!s} generic map (.....)")
        elif isinstance(item, DefaultClock):
            buffer.append(f"{prefix}- default {item.Identifier} is {'...'}", )
        else:
            raise PrettyPrintException(f"Unhandled declared item kind '{item.__class__.__name__}'.")

        return buffer

    def formatType(self, item: BaseType) -> str:
        result = f"type {item.Identifier} is "
        if isinstance(item, IncompleteType):
            result += ""
        elif isinstance(item, IntegerType):
            result += f"range {item.Range!s}"
        elif isinstance(item, EnumeratedType):
            result += "(........)"
        elif isinstance(item, PhysicalType):
            result += " is range ....... units ..... end units"
        elif isinstance(item, ArrayType):
            result += "array(........) of ....."
        elif isinstance(item, RecordType):
            result += "record ..... end record"
        elif isinstance(item, AccessType):
            result += "access ....."
        elif isinstance(item, FileType):
            result += "file ....."
        elif isinstance(item, ProtectedType):
            result += "protected ..... end protected"
        elif isinstance(item, ProtectedTypeBody):
            result += "protected body ..... end protected body"
        else:
            raise PrettyPrintException(f"Unknown type '{item.__class__.__name__}'")

        return result

    def formatSubtypeIndication(self, subtypeIndication, entity: str, name: str) -> str:
        if isinstance(subtypeIndication, SimpleSubtypeSymbol):
            return f"{subtypeIndication.SymbolName}"
        elif isinstance(subtypeIndication, ConstrainedCompositeSubtypeSymbol):
            constraints = []
            for constraint in subtypeIndication.Constraints:
                constraints.append(str(constraint))

            return "{type}({constraints})".format(type=subtypeIndication.SymbolName, constraints=", ".join(constraints))
        else:
            raise PrettyPrintException(f"Unhandled subtype kind '{subtypeIndication.__class__.__name__}' for {entity} '{name}'.")

    def formatInitialValue(self, item: WithDefaultExpressionMixin) -> str:
        if item.DefaultExpression is None:
            return ""

        return f" := {item.DefaultExpression!s}"

    def formatHierarchy(self, statement: ConcurrentStatement, level: int = 0) -> StringBuffer:
        buffer = []
        prefix = "  " * level

        if isinstance(statement, ProcessStatement):
            buffer.append(f"{prefix}- {statement.Label}: process(...)")
        elif isinstance(statement, EntityInstantiation):
            buffer.append(f"{prefix}- {statement.Label}: entity {statement.Entity}")
        elif isinstance(statement, ComponentInstantiation):
            buffer.append(f"{prefix}- {statement.Label}: component {statement.Component}")
        elif isinstance(statement, ConfigurationInstantiation):
            buffer.append(f"{prefix}- {statement.Label}: configuration {statement.Configuration}")
        elif isinstance(statement, ConcurrentBlockStatement):
            buffer.append(f"{prefix}- {statement.Label}: block")
            for stmt in statement.Statements:
                for line in self.formatHierarchy(stmt, level + 2):
                    buffer.append(line)
        elif isinstance(statement, IfGenerateStatement):
            buffer.append(f"{prefix}- {statement.Label}: if {statement.IfBranch.Condition} generate")
            for stmt in statement.IfBranch.Statements:
                for line in self.formatHierarchy(stmt, level + 2):
                    buffer.append(line)
            for elsifBranch in statement.ElsifBranches:
                buffer.append(f"{prefix}  {statement.Label}: elsif {elsifBranch.Condition} generate")
                for stmt in elsifBranch.Statements:
                    for line in self.formatHierarchy(stmt, level + 2):
                        buffer.append(line)
            if statement.ElseBranch is not None:
                buffer.append(f"{prefix}  {statement.Label}: else generate")
                for stmt in statement.ElseBranch.Statements:
                    for line in self.formatHierarchy(stmt, level + 2):
                        buffer.append(line)
        elif isinstance(statement, CaseGenerateStatement):
            buffer.append(f"{prefix}- {statement.Label}: case {statement.SelectExpression} generate")
            for case in statement.Cases:
                buffer.append(f"{prefix}    {case!s}")
                for stmt in case.Statements:
                    for line in self.formatHierarchy(stmt, level + 2):
                        buffer.append(line)
        elif isinstance(statement, ForGenerateStatement):
            buffer.append(f"{prefix}- {statement.Label}: for {statement.LoopIndex} in {statement.Range} generate")
            for stmt in statement.Statements:
                for line in self.formatHierarchy(stmt, level + 2):
                    buffer.append(line)
        elif isinstance(statement, ConcurrentProcedureCall):
            buffer.append(f"{prefix}- {statement.Label}: {statement.Procedure!s}(...)")

        return buffer