# coding=utf-8
"""Create links for a variable"""
from earthdiagnostics.diagnostic import (
    Diagnostic,
    DiagnosticOption,
    DiagnosticDomainOption,
    DiagnosticBoolOption,
    DiagnosticVariableOption,
)


class Relink(Diagnostic):
    """
    Recreates the links for the variable specified

    :original author: Javier Vegas-Regidor<javier.vegas@bsc.es>

    :created: September 2016

    :param data_manager: data management object
    :type data_manager: DataManager
    :param startdate: startdate
    :type startdate: str
    :param member: member number
    :type member: int
    :param chunk: chunk's number
    :type chunk: int
    :param variable: variable's name
    :type variable: str
    :param domain: variable's domain
    :type domain: ModelingRealm
    :param move_old: if true, looks for files following the old convention
        and moves to avoid collisions
    :type move_old: bool
    """

    alias = "relink"
    "Diagnostic alias for the configuration file"

    def __init__(
        self,
        data_manager,
        startdate,
        member,
        chunk,
        domain,
        variable,
        move_old,
        grid,
    ):
        Diagnostic.__init__(self, data_manager)
        self.startdate = startdate
        self.member = member
        self.chunk = chunk
        self.variable = variable
        self.domain = domain
        self.move_old = move_old
        self.grid = grid
        self.var_manager = data_manager.config.var_manager

    def __str__(self):
        return (
            "Relink output Startdate: {0.startdate} Member: {0.member} "
            "Chunk: {0.chunk} Move old: {0.move_old} "
            "Variable: {0.domain}:{0.variable} Grid: {0.grid}".format(self)
        )

    def __hash__(self):
        return hash(str(self))

    def __eq__(self, other):
        if self._different_type(other):
            return False
        return (
            self.startdate == other.startdate
            and self.member == other.member
            and self.chunk == other.chunk
            and self.domain == other.domain
            and self.variable == other.variable
            and self.move_old == other.move_old
            and self.grid == other.grid
        )

    @classmethod
    def generate_jobs(cls, diags, options):
        """
        Create a job for each chunk to compute the diagnostic

        :param diags: Diagnostics manager class
        :type diags: Diags
        :param options: variable, domain, move_old=False
        :type options: list[str]
        :return:
        """
        options_available = (
            DiagnosticDomainOption(),
            DiagnosticVariableOption(diags.data_manager.config.var_manager),
            DiagnosticBoolOption("move_old", True),
            DiagnosticOption("grid", ""),
        )
        options = cls.process_options(options, options_available)
        job_list = list()
        chunk_list = diags.config.experiment.get_chunk_list()
        for startdate, member, chunk in chunk_list:
            job_list.append(
                Relink(
                    diags.data_manager,
                    startdate,
                    member,
                    chunk,
                    options["domain"],
                    options["variable"],
                    options["move_old"],
                    options["grid"],
                )
            )
        return job_list

    def request_data(self):
        """Request data required by the diagnostic"""

    def declare_data_generated(self):
        """Declare data to be generated by the diagnostic"""

    def compute(self):
        """Run the diagnostic"""
        self.data_manager.link_file(
            self.domain,
            self.variable,
            self.var_manager.get_variable(self.variable),
            self.startdate,
            self.member,
            self.chunk,
            move_old=self.move_old,
            grid=self.grid,
        )