""" Harvest Controllers

"""

import traceback

from gluon import current
from gluon.restricted import RestrictedError
from harvest_tools import (Automaton,
                           build_harvester_tool,
                           format_author_fr,
                           family_name_fr,
                           ToolException)
from invenio_tools import (CheckAndFix,
                           CheckException,
                           load_record,
                           OAI_URL,
                           RecordConf,
                           RecordThesis)
from plugin_dbui import (get_id,
                         INLINE_ALERT,
                         Selector,
                         to_formPanel,
                         UNDEF_ID)

DRY_RUN = T("dry run")
MSG_NO_REG_INSTITUTE = T("Preference REG_INSTITUTE is not defined.")
MSG_NO_HARVESTER = T("No harvesters for your selection !!!")


def free_run():
    """Run a free harvester.
    All harvester parameters are defined via the selector.

    """
    if not current.app.inspirehep_institute_id:
        return INLINE_ALERT % (T("Error"), MSG_NO_REG_INSTITUTE)

    table = virtdb.free_harvester_selector
    fields = ('collections',
              'controller',
              'host',
              'id_projects',
              'id_teams',
              'id_categories',
              'ratio')

    try:
        selector = Selector(table,
                            exclude_fields=('mode', 'year_start', 'year_end'))

        for el in fields:
            if not selector[el]:
                msg = T('All fields of the form have to be defined !!!')
                msg += "<br>"
                msg += T('The field "%s" is missing ...') % T(table[el].label)
                return INLINE_ALERT % (T('Error'), msg)

        tool = build_harvester_tool(db,
                          selector.id_teams,
                          selector.id_projects,
                          selector.controller,
                          selector.id_categories,
                          year_start=selector.year_start,
                          year_end=selector.year_end,
                          dry_run=(selector.mode == DRY_RUN),
                          debug=False)
        if not tool:
            return INLINE_ALERT % (T('Error'), T('Select an harvester.'))

        tool.process_url(selector.host, selector.collections)

    except ToolException as e:
        return T(str(e))

    except BaseException as e:
        msg = '<br><br><hr/>'
        msg += CODE(traceback.format_exc()).xml()
        msg += '<hr/>'
        return msg

    response.view = 'harvest/layout.html'
    report = tool.report()
    report['selector'] = selector
    return report


def edit_insert():
    """Edit an invenio record and insert it in the database.

    @note: Recovery procedures are applied to fix basic non-conformity, but
    no checks are run. The user is editing the record to fix problems.

    """
    if not current.app.inspirehep_institute_id:
        return INLINE_ALERT % (T("Error"), MSG_NO_REG_INSTITUTE)

    fields = ('controller',
              'host',
              'id_projects',
              'id_teams',
              'id_categories',
              'record_id')

    table = virtdb.edit_insert_selector

    try:
        selector = Selector(table)

        for el in fields:
            if not selector[el]:
                msg = T('All fields of the form have to be defined !!!')
                msg += "<br>"
                msg += T('The field "%s" is missing ...') % T(table[el].label)
                return INLINE_ALERT % (T('Error'), msg)

        # record
        record = load_record(selector.host, selector.record_id)

        # form configuration
        cfg = to_formPanel(db.publications)

        # tools to extract values to be loaded in the form
        values = {}
        check = CheckAndFix()

        # NOTE
        # publication tool is only require to extract the list of my authors
        tool = Automaton(db,
                         selector.id_teams,
                         selector.id_projects,
                         selector.controller,
                         selector.id_categories,
                         dry_run=True,
                         debug=False)

        # title, preprint, URL, report number
        values['PublicationsTitle'] = record.title()
        values['PublicationsPreprint'] = record.preprint_number()
        values['PublicationsPublication_url'] = record.paper_url()
        values['PublicationsReport_numbers'] = record.report_number()

        # authors
        try:
            check.authors(record)
            check.format_authors(record, format_author_fr)

            check.my_authors(record,
                             reference=tool._my_author_list(record),
                             cmpFct=family_name_fr)

        except CheckException:
            pass

        values['PublicationsFirst_author'] = record.first_author()
        values['PublicationsAuthors'] = record.authors()
        values['PublicationsAuthors_institute'] = record.my_authors

        # collaboration
        recId = get_id(db.collaborations, collaboration=record.collaboration())
        values['PublicationsId_collaborations'] = int(recId) if recId else UNDEF_ID

        # teams, project, categories, origin
        values['PublicationsId_categories'] = int(selector.id_categories)
        values['PublicationsId_projects'] = int(selector.id_projects)
        values['PublicationsId_teams'] = int(selector.id_teams)
        values['PublicationsOrigin'] = OAI_URL % (selector.host, selector.record_id)

        # publishers
        if selector.controller in ('articles', 'proceedings'):

            check.clean_erratum(record)
            check.format_editor(record)

            recId = get_id(db.publishers, abbreviation=record.paper_editor())
            values['PublicationsId_publishers'] = int(recId) if recId else UNDEF_ID
            values['PublicationsVolume'] = record.paper_volume()
            values['PublicationsPages'] = record.paper_pages()

        # conference
        if selector.controller in ('proceedings', 'talks'):

            try:
                check.conference(record)
            except CheckException:
                pass

            if isinstance(record, RecordConf):
                values['PublicationsConference_title'] = record.conference_title()
                values['PublicationsConference_url'] = record.conference_url()
                values['PublicationsConference_dates'] = record.conference_dates()
                values['PublicationsConference_town'] = record.conference_town()

                recId = get_id(db.countries, country=record.conference_country())
                values['PublicationsId_countries'] = \
                recId if recId is not None else UNDEF_ID

                values['PublicationsConference_speaker'] = record.first_author()

        # thesis
        if selector.controller == 'theses':

            if isinstance(record, RecordThesis):
                values['PublicationsUniversities'] = record.these_universities()
                values['PublicationsDirectors'] = record.these_directors()
                values['PublicationsDefense'] = record.these_defense()

        # submitted date and year
        try:
            check.submitted(record)
            check.year(record)
        except CheckException:
            pass

        values['PublicationsSubmitted'] = ', '.join(record.submitted())
        values['PublicationsYear'] = record.year()

    except Exception:

        # log the exception in the web2py ticker system
        ticket = RestrictedError(layer='harvester.py',
                                 code='edit_insert',
                                 output='',
                                 environment=current.globalenv)
        ticket.log(request)

        # inform the user that something went wrong in the server
        raise HTTP(500)

    return dict(cfg=cfg, values=values)


def insert_marcxml():
    """Insert a MarcXML record in the database.

    """
    if not current.app.inspirehep_institute_id:
        return INLINE_ALERT % (T("Error"), MSG_NO_REG_INSTITUTE)

    try:
        selector = Selector(virtdb.marc12_selector, exclude_fields=('mode'))

        tool = build_harvester_tool(db,
                                    selector.id_teams,
                                    selector.id_projects,
                                    selector.controller,
                                    selector.id_categories,
                                    year_start=selector.year_start,
                                    year_end=selector.year_end,
                                    dry_run=(selector.mode == DRY_RUN),
                                    debug=False)
        if not tool:
            return INLINE_ALERT % (T('Error'), T('Select an harvester.'))

        tool.process_xml(selector.xml)

    except ToolException as e:
        return T(str(e))

    except BaseException as e:
        msg = '<br><br><hr/>'
        msg += CODE(traceback.format_exc()).xml()
        msg += '<hr/>'
        return msg

    response.view = 'harvest/layout.html'
    report = tool.report()
    report['selector'] = selector
    return report


def run():
    """Run an harvester.

    Scan the cds/invenio stores to find articles published during
    a given range of years and for a given team/project.
    Insert them in the database if they don't exist.

    The scanning is steered using the current request arguments as well as
    the harvest parameters associated to this action.

    Search arguments are defined via the harvester selector.

    """
    if not current.app.inspirehep_institute_id:
        return INLINE_ALERT % (T("Error"), MSG_NO_REG_INSTITUTE)

    try:
        selector = Selector(virtdb.harvester_selector,
                            exclude_fields=('mode', 'year_start', 'year_end'))

        # Get the host and collections
        row = selector.select(db.harvesters).first()
        if not row:
            raise ToolException(MSG_NO_HARVESTER)

        tool = build_harvester_tool(db,
                                    selector.id_teams,
                                    selector.id_projects,
                                    selector.controller,
                                    row.harvesters.id_categories,
                                    year_start=selector.year_start,
                                    year_end=selector.year_end,
                                    dry_run=(selector.mode == DRY_RUN),
                                    debug=False)
        if not tool:
            return INLINE_ALERT % (T('Error'), T('Select an harvester.'))

        tool.process_url(row.harvesters.host, row.harvesters.collections)

    except ToolException as e:
        return T(str(e))

    except BaseException as e:
        msg = '<br><br><hr/>'
        msg += CODE(traceback.format_exc()).xml()
        msg += '<hr/>'
        return msg

    response.view = 'harvest/layout.%s' % request.extension
    report = tool.report()
    report['selector'] = selector
    return report


def run_all():
    """Run all harvesters in one go.

    """
    if not current.app.inspirehep_institute_id:
        return INLINE_ALERT % (T("Error"), MSG_NO_REG_INSTITUTE)

    collection_logs = []
    logs = []

    try:
        selector = Selector(virtdb.run_all_harvesters_selector,
                            exclude_fields=('mode', 'year_start', 'year_end'))

        query = None
        for fieldname in ('id_teams', 'id_projects'):
            if selector[fieldname]:
                q = db.harvesters[fieldname] == selector[fieldname]
                if query:
                    query = (query) & (q)
                else:
                    query = q

        harvesters = db(query).select(db.harvesters.ALL)
        if not len(harvesters):
            return INLINE_ALERT % (T('Error'), MSG_NO_HARVESTER)

        for harvester in harvesters:

            tool = build_harvester_tool(db,
                                        harvester.id_teams,
                                        harvester.id_projects,
                                        harvester.controller,
                                        harvester.id_categories,
                                        year_start=selector.year_start,
                                        year_end=selector.year_end,
                                        dry_run=(selector.mode == DRY_RUN),
                                        debug=False)
            if not tool:
                return INLINE_ALERT % (T('Error'), T('Select an harvester.'))

            tool.process_url(harvester.host, harvester.collections)

            collection_logs.extend(tool.collection_logs)
            logs.extend(tool.logs)

    except ToolException as e:
        return T(str(e))

    except BaseException as e:
        msg = '<br><br><hr/>'
        msg += CODE(traceback.format_exc()).xml()
        msg += '<hr/>'
        return msg

    # tune selector parameters used in the report title
    if query is None:
        selector.id_projects = None

    # delegate rendering to the report view
    response.view = 'harvest/layout.%s' % request.extension
    return dict(collection_logs=collection_logs,
                controller='all harvesters',
                logs=logs,
                selector=selector)