#!/usr/bin/python
# -*- coding: utf-8 -*-
# ---------------------------------------------------------------------------------------------------------
# Author : Ulrich Carmesin
# Source : gitea.ucarmesin.de
# ---------------------------------------------------------------------------------------------------------
# managing the components
# -----------------------------------------------------------------------------
"""
component has to be created in relation of the application (basis.yml).
Each componente could be created mostly once, but not everytime:
* the same instance of a component is used in different contexts
* there could be exist more instances
* there could be alternatives of an instance
Each kind of instance has its component-class and for each use should be an object be created.
Each crated component-onject are documented in the parameter-file.
"""
import utils.config_tool
import utils.conn_tool
import basic.program
import basic.message
import components.component
import importlib
import copy
import basic.constants as B

comps = {}
PARAM_NOSUBNODE = ["artifact", "components", "instance"]
DEFAULT_INST_CNT = 1
DEFAULT_INST_SGL = "y"


def getInstanceAttributes(conf):
    """
    the attributes for instancing the component are set from configuration or from default
    :param conf:
    :return: a complete set of these attributes
    """
    out = {
        B.ATTR_INST_CNT: DEFAULT_INST_CNT,
        B.ATTR_INST_SGL: DEFAULT_INST_SGL
    }
    if B.SUBJECT_INST in conf:
        for attr in [B.ATTR_INST_CNT, B.ATTR_INST_SGL]:
            if attr in conf[B.SUBJECT_INST]:
                out[attr] = conf[B.SUBJECT_INST][attr]
    return out


def getComponents(mainfct):
    job = basic.program.Job.getInstance()
    verify = -2 + job.getDebugLevel("job_tool")
    job.debug(verify, "getComponents " + mainfct)
    out = []
    for c in comps:
        job.debug(verify, "getComponents " + c + ": " + str(comps[c].conf))
        print("getComponents " + c + ": " + str(comps[c].conf))
        if mainfct in comps[c].conf["function"]:
            out.append(c)
    return out


class ComponentManager:
    __instance = None
    """ 
    initializes the Manager with all necessary components  
    """

    def __init__(self):
        job = basic.program.Job.getInstance()
        job.m.logDebug("applicationscomponente -- " + str(type(job.par)))
        self.components = {}
        ComponentManager.__instance = self
        print ("init ComponentHandling "+str(self))

    def initComponents(self):
        # sets components the first time
        # afterwards set components from parameter-file
        job = basic.program.Job.getInstance()
        anw = job.par.application
        job.m.logDebug("applicationscomponente -- " + str(type(job.par)))
        if not job.conf.confs["applicationen"].get(anw):
            job.m.setFatal("application " + job.par.application + " is not configured")
            return
        for k in job.conf.confs["applicationen"].get(anw):
            job.m.logDebug("applicationscomponente -- " + k + ":")
            self.createComponent(k, 0, "")

    def setComponents(self):
        # set components from parameter-file
        job = basic.program.Job.getInstance()
        job.m.logDebug("applicationscomponente -- " + str(type(job.par)))

    def getComponent(self, compobjname):
        job = basic.program.Job.getInstance()
        verify = -2 + job.getDebugLevel("job_tool")
        job.debug(verify, "getComponents " + compobjname)
        return comps[compobjname]

    def getComponents(self, mainfct):
        job = basic.program.Job.getInstance()
        verify = -2 + job.getDebugLevel("job_tool")
        job.debug(verify, "getComponents " + mainfct)
        out = []
        for c in comps:
            job.debug(verify, "getComponents " + c + ": " + str(comps[c].conf))
            print("getComponents " + c + ": " + str(comps[c].conf))
            if mainfct in comps[c].conf["function"]:
                out.append(c)
        return out

    @staticmethod
    def getInstance(init="N"):
        if (ComponentManager.__instance is not None):
            return ComponentManager.__instance
        elif (init != "N"):
            return ComponentManager()
        else:
            raise Exception("Klasse noch nicht initialisiert")

    def createComponent(self, componentName, nr, suffix):
        """
        in order to create a component it must be loaded
        * knogwedge of the application - which components should be created
        * technical-knowledge of the instanciated component, especially the connection, user, password
        * business-knowledge of the component, especially of their interfaces resp. artifacts
        :param componentName: Name of the component
        :param nr:     for numbered instance if component is multiple
        :param suffix: suffix for specific context of the component
        :return:
        """
        job = basic.program.Job.getInstance()
        verify = job.getDebugLevel("job_tool")
        componentName = componentName.lower()
        job.debug(verify, "createComponent " + componentName)
        confs = utils.config_tool.getConfig("comp", componentName)
        conns = utils.conn_tool.getConnections(componentName)
        instAttr = getInstanceAttributes(confs)
        job.debug(verify, "createComponent -91- " + componentName + " : " + str(confs))
        if nr > 0 and int(instAttr[B.ATTR_INST_CNT]) > 1:
            job.m.setError("for multiple callers are multiple calls not implemented ")
        if nr > 0 and len(conns) == 0:
            job.m.setError("for multiple calls has only one call configured")
        print(confs)
        parContent = job.loadParameter()
        if len(conns) == 1:
            c = self.createInstance(componentName, parContent, confs, conns, 0)
            print("createComponent 3 a " + componentName)
            self.createSubComponents(c, nr, suffix)
        else:
            i = 1
            print("createComponent 3 b " + componentName)
            for cn in conns:
                c = self.createInstance(componentName, parContent, confs, conns, i)
                self.createSubComponents(c, i, suffix)
                i = i + 1
        print("createComponent 9 " + componentName)
        print(comps)

    def createInstance(self, compName, parContent, confs, conns, nr):
        """
        instance a component
        :param compName:    name without suffix or number
        :param parContent:  content of the parameter-file which is dumped from a pre-step
        :param confs:       configuration of the component
        :param conns:       connection-attributes for the specific environment
        :param nr:          number if component is multiple
        :return:  instance of the component with all necessary attributes
        """
        cmodul = importlib.import_module(getComponentPath(compName))
        class_ = getattr(cmodul, getComponentClass(compName))
        c = class_()
        if nr > 0:
            name = compName + "_0" + str(nr)
            i = nr - 1
        else:
            name = compName
            i = 0
        c.name = name
        c.conf = confs["conf"]
        c.conf[B.SUBJECT_CONN] = conns[i]
        c.m = basic.message.Message(basic.message.LIMIT_DEBUG, "logTime", name)
        c.init()
        if parContent is not None:
            print("createComponent 5 a " + name + " : " + str(parContent))
            if name in parContent["comps"]:
                for k in parContent["comps"][name].keys():
                    c.conf[k] = parContent["comps"][name][k]
        if B.SUBJECT_ARTS in c.conf and B.TOPIC_NODE_DB in c.conf[B.SUBJECT_ARTS]:
            if not B.DATA_NODE_DDL in c.conf:
                c.conf[B.DATA_NODE_DDL] = {}
                for table in c.conf[B.SUBJECT_ARTS][B.TOPIC_NODE_DB]:
                    if table in ["type"]:
                        continue
                    conf = utils.config_tool.getConfig("DATASTRUCTURE", c.name, table)
                    if "tabelle" in conf and table in conf["tabelle"]:
                        c.conf[B.DATA_NODE_DDL][table] = conf["tabelle"][table]
                    else:
                        c.conf[B.DATA_NODE_DDL][table] = conf
        comps[name] = c
        return c

    def createSubComponents(self, comp, nr, suffix):
        job = basic.program.Job.getInstance()
        verify = -2 + job.getDebugLevel("job_tool")
        job.debug(verify, "getComponents " + str(comp.conf[B.ATTR_INST_SUBCOMP]))
        for c in comp.conf[B.ATTR_INST_SUBCOMP].keys():
            if c == "none":
                continue
            self.createComponent(c, nr, suffix)


def getComponentFolder(comp):
    return comp.lower()


def getComponentModul(comp):
    return comp[0:1].upper() + comp[1:].lower()


def getComponentClass(comp):
    return comp[0:1].upper() + comp[1:].lower()


def getComponentPath(comp):
    return "components." + getComponentFolder(comp) + "." + getComponentModul(comp)


def getComponentDict():
    job = basic.program.Job.getInstance()
    verify = -2 + job.getDebugLevel("job_tool")
    job.debug(verify, "getComponents ")
    out = {}
    for c in comps:
        out[comps[c].name] = {}
        for k in comps[c].conf.keys():
            if isParameterSubnode(k):  # "artifact" in k or "components" in k or "instance" in k:
                out[comps[c].name][k] = copy.deepcopy(comps[c].conf[k])
    return out


def isParameterSubnode(key):
    for k in PARAM_NOSUBNODE:
        if key in k:
            return False
    return True


def getPlainCompname(name):
    if "_0" in name:
        return name[0:-3]
    return name