import datetime
from urllib import parse

from django.contrib.auth.models import User
from django.contrib.gis.db import models
from django.db import connection
from django.template.defaultfilters import slugify
from django.utils.translation import ugettext as _

from django_extensions.db.fields import AutoSlugField
from django_countries.fields import CountryField
from multiselectfield import MultiSelectField
from phonenumber_field.modelfields import PhoneNumberField

from . import validators


class CaseStudyDraft(models.Model):
    author = models.ForeignKey(
        User, on_delete=models.CASCADE
    )

    data = models.TextField()


class SpatialRefSys(connection.ops.spatial_ref_sys()):
    def __str__(self):
        return self.__unicode__()

    def __unicode__(self):
        return '{0.auth_name}:{0.auth_srid} {0.name}'.format(self)

    class Meta:
        proxy = True
        verbose_name = "spatial reference system"


class CaseStudyQuerySet(models.QuerySet):
    def approved(self):
        return self.filter(
            approved=True
        )


class CaseStudy(models.Model):
    """Model for case studies submitted to the Ojuso Platform"""

    approved = models.BooleanField(default=False)

    # Choice lists for drop-downs
    SECTOR_CHOICES = (
        ('RN', _('Renewable Energy Generation')),
        ('PG', _('Power Grids')),
        ('SM', _('Supply of Minerals')),
    )

    POSITIVE_NEGATIVE_CHOICES = (
        ('P', _('Positive')),
        ('N', _('Negative'))
    )

    LAND_OWNERSHIP_CHOICES = (
        ('PRI', _('Private Land')),
        ('PUB', _('Public Land')),
        ('COM', _('Community Land')),
        ('OTH', _('Other')),
    )

    LOCATION_CONTEXT_CHOICES = (
        ('RUR', _('Rural')),
        ('URB', _('Urban')),
        ('MIX', _('Mixed')),
    )

    TYPE_OF_ECOSYSTEM_CHOICES = (
        ('MARINE', _('Marine (e.g. Ocean, Sea)')),
        ('FRESH', _('Freshwater (e.g. Freshwater, Lake)')),
        ('FOREST', _('Forest/Jungle')),
        ('AGRI', _('Agricultural Land')),
        ('GRASS', _('Grassland')),
        ('DESERT', _('Desert (Tundra, Ice or Sand)')),
        ('WETLND', _('Wetland (Marsh, Mangrove, Peat Soil)')),
        ('URBAN', _('Urban'))
    )

    PROJECT_STATUS_CHOICES = (
        ('EXSTNG', _('Existing Project')),
        ('UCONST', _('Under Construction')),
        ('PROJCD', _('Projected Project')),
    )

    FINANCIAL_INSTITUTIONS = (
        ('AfDB',   _('African Development Bank (AfDB)')),
        ('BADEA',  _('Arab Bank for Economic Development in Africa (BADEA)')),
        ('ADB',    _('Asian Development Bank (ADB)')),
        ('AIIB',   _('Asian Infrastructure Investment Bank (AIIB)')),
        ('BSTDB',  _('Black Sea Trade and Development Bank (BSTDB)')),
        ('CAF',    _('Corporacion Andina de Fomento / Development Bank of Latin America (CAF)')),
        ('CDB',    _('Caribbean Development Bank (CDB)')),
        ('CABEI',  _('Central American Bank for Economic Integration (CABEI)')),
        ('EADB',   _('East African Development Bank (EADB)')),
        ('ETDB',   _('Economic Cooperation Organization Trade and Development Bank (ETDB)')),
        ('EDB',    _('Eurasian Development Bank (EDB)')),
        ('EBRD',   _('European Bank for Reconstruction and Development (EBRD)')),
        ('EC',     _('European Commission (EC)')),
        ('EIB',    _('European Investment Bank (EIB)')),
        ('IADB',   _('Inter-American Development Bank Group (IDB, IADB)')),
        ('IFFIm',  _('International Finance Facility for Immunisation (IFFIm)')),
        ('IFAD',   _('International Fund for Agricultural Development (IFAD)')),
        ('IIB',    _('International Investment Bank (IIB)')),
        ('IsDB',   _('Islamic Development Bank (IsDB)')),
        ('FMO',    _('Nederlandse Financieringsmaatschappij voor Ontwikkelingslanden NV (FMO)')),
        ('NDB',    _('New Development Bank (NDB) (formerly BRICS Development Bank)')),
        ('NDF',    _('The Nordic Development Fund')),
        ('NIB',    _('Nordic Investment Bank (NIB)')),
        ('OFID',   _('OPEC Fund for International Development (OFID)')),
        ('BOAD',   _('West African Development Bank (BOAD)')),
        ('WB',     _('World Bank')),
    )

    GENERATION_TECHNOLOGY_CHOICES = (
        (_('Wind energy'), (
            ('SSWE', _('Small-scale (less than 500kW)')),
            ('LSWE', _('Large-scale (more than 500kW)'))
        )),
        (_('Photovoltaic electricity'), (
            ('SSPV', _('Small-scale (less than 500kW)')),
            ('LSPV', _('Large-scale (more than 500kW)'))
        )),
        (_('Hydroelectric'), (
            ('SHYD', _('Small-scale (less than 1MW)')),
            ('MHYD', _('Medium-scale (between 1-20MW)')),
            ('LHYD', _('Large-scale (more than 20MW - often not considered renewable)')),
        )),
        ('STHE', _('Solar thermal electricity (e.g using parabolic reflectors)')),
        ('GEOT', _('Geothermal electricity')),
        ('BIOG', _('Biogas turbine')),
        ('OTHB', _('Other biomass (including liquid/solid biofuel)')),
        ('OTHR', _('Other (tidal, wave etc)'))
    )

    POWER_TECHNOLOGY_CHOICES = (
        ('PT', _('Power transmission (grid lines, substations etc)')),
        ('ES', _('Energy storage (pumped storage, compressed air, battery systems etc')),
        ('OT', _('Others'))
    )

    TYPE_OF_EXTRACTION_CHOICES = (
        ('SUR', _('Surface (open pit/open cast/open cut mining)')),
        ('SUB', _('Sub-surface (underground mining)')),
        ('SEA', _('Seabed mining')),
        ('URB', _('Urban mining/recycling'))
    )

    MINERAL_COMMODITY_CHOICES = (
        ('ALU', _('Aluminium (Bauxite)')),
        ('ARS', _('Arsenic')),
        ('BER', _('Beryllium')),
        ('CAD', _('Cadmium')),
        ('CHR', _('Chromium')),
        ('COK', _('Coking')),
        ('COA', _('Coal (for steel)')),
        ('COP', _('Copper')),
        ('GAL', _('Gallium')),
        ('GER', _('Germanium')),
        ('GLD', _('Gold')),
        ('HRE', _('Heavy Rare Earth Elements (Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Yttrium, Scandium)')),
        ('IRN', _('Iron')),
        ('LRE', _('Light Rare Earth Elements (Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium)')),
        ('LED', _('Lead')),
        ('LIT', _('Lithium')),
        ('MAN', _('Manganese')),
        ('MER', _('Mercury')),
        ('MOL', _('Molybdenum')),
        ('NIC', _('Nickel')),
        ('NIO', _('Niobium')),
        ('PGM', _('Platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, and platinum)')),
        ('RHE', _('Rhenium')),
        ('SIL', _('Silicon')),
        ('SIV', _('Silver')),
        ('TAN', _('Tantalum')),
        ('TEL', _('Tellurium')),
        ('THA', _('Thallium')),
        ('TIN', _('Tin')),
        ('TIT', _('Titanium')),
        ('TUN', _('Tungsten')),
        ('VAN', _('Vanadium')),
        ('ZNC', _('Zinc')),
        ('OTR', _('Other'))
    )

    USE_IN_ENERGY_ECONOMY_CHOICES = (
        ('WTM', _('Wind turbine manufacturing')),
        ('SPM', _('Solar panel manufacturing')),
        ('STM', _('Solar thermal system manufacturing')),
        ('HGM', _('Hydropower generator manufacturing')),
        ('GGM', _('Geothermal generator manufacturing')),
        ('ESS', _('Energy storage (inc. battery systems)')),
        ('OTR', _('Others'))
    )

    POSITIVE_CASE_TYPE_CHOICES = (
        ('CREP', _('Community renewable energy project')),
        ('EACP', _('Energy as a commons project')),
        ('PSEP', _('Public/state (federal, state, municipal) energy project')),
        ('CORS', _('A case of responsible sourcing/supply chain/lifecycle management')),
    )

    NEGATIVE_CASE_REASONS_OTHER_TEXT = _('Other reasons')

    NEGATIVE_CASE_REASONS_CHOICES = (
        ('VOLR', _('Violation of land rights')),
        ('VOHR', _('Violation of fundamental human rights, indigenous rights and/or other collective rights')),
        ('EIMP', _('Environmental impacts (severe impacts on ecosystems / violation of laws, plans or programs of \
                    environmental conservation or territorial governance systems etc.')),
        ('NCUL', _('Negative cultural impacts (erosion/destruction of bio-cultural heritage, impacts on sacred land \
                    etc)')),
        ('AGGR', _('Aggression/threats to community members opposed to the project, collaboration with organized crime \
                    etc')),
        ('ALAB', _('Abusive labour practices')),
        ('CRUP', _('Corruption and/or irregular permitting or contracting, conflicts of interest etc')),
        #
        # N.B.
        # If you add another field in here, you need to edit conditionalCheckboxes
        # in templates/map/form.html and increment the check for the 'other' field there.
        # If you don't, the 'other' detail entry won't show and hide at the appropriate
        # times.
        #
        ('OTHR', NEGATIVE_CASE_REASONS_OTHER_TEXT)
    )

    # Dynamically generate a list of choices 40 years prior and after the current year.
    YEAR_CHOICES = [(r, r) for r in
                    range((datetime.datetime.now().year - 40),
                          (datetime.datetime.now().year + 41))]

    ##
    # Meta Fields
    ##

    # User who submitted case study
    author = models.ForeignKey(
            User,
            models.SET_NULL,
            blank=True,
            null=True,
            editable=False
    )

    # Date and time of submission
    date_created = models.DateTimeField(auto_now_add=True, null=False)

    # Slug derived from entry_name, used in urls for SEO
    slug = AutoSlugField(populate_from=['entry_name'], editable=False)

    ##
    # First Screen - Basic information
    ##

    # 1.1
    entry_name = models.CharField(
        verbose_name=_("Entry Name"),
        help_text=_("Enter the name of the entry. This should usually be the\
                   name of project."),
        max_length=128
    )

    # N/A - Not explicitly listed in spec
    location = models.PointField(
        verbose_name=_("Project location")
    )

    # 1.2
    sector_of_economy = models.CharField(
        verbose_name=_("Sector of economy"),
        help_text=_("Which sector of the renewable energy economy is most\
                    relevant?"),
        max_length=3,
        choices=SECTOR_CHOICES
    )

    # 1.3
    positive_or_negative = models.CharField(
        verbose_name=_("Positive or negative?"),
        help_text=_("Is the case study a positive case or a negative case?"),
        max_length=1,
        choices=POSITIVE_NEGATIVE_CHOICES
    )

    # 1.4
    country = CountryField(
        verbose_name=_("Country"),
        help_text=_("Select the country of the project")
    )

    # 1.5.1
    area_of_land = models.IntegerField(
        verbose_name=_("Approximate land area"),
        help_text=_("The area of land covered by the project (in km²)")
    )

    # 1.5.2
    land_ownership = models.CharField(
        verbose_name=_("Land ownership"),
        help_text=_("What type of ownership does the land fall under?"),
        max_length=3,
        choices=LAND_OWNERSHIP_CHOICES
    )

    # 1.5.3
    land_ownership_details = models.CharField(
        verbose_name=_("Land ownership details"),
        help_text=_("Please specify details about land ownership if you chose 'other'"),
        max_length=256,
        null=True,
        blank=True,
    )

    # 1.5.4
    location_context = models.CharField(
        verbose_name=_("Location"),
        help_text=_("Select the context that is most applicable to this case\
                    study."),
        max_length=3,
        choices=LOCATION_CONTEXT_CHOICES
    )

    # 1.5.5
    type_of_ecosystem = MultiSelectField(
        verbose_name=_("Type(s) of ecosystem"),
        help_text=_("Select the most relevant type(s)."),
        max_length=56,
        choices=TYPE_OF_ECOSYSTEM_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 1.5.5.3
    describe_ecosystem = models.TextField(
        verbose_name=_("Describe the ecosystem"),
        help_text=_("In your own words, add more detail about the ecosystem."),
    )

    # Was 1.5.6; spec not being followed here after request from client
    people_affected_indigenous = models.TextField(
        verbose_name=_("Indigenous people affected"),
        help_text=_("What group or groups of indigenous people are affected by this project? \
                     Please separate by newline."),
        blank=True
    )

    people_affected_other = models.TextField(
        verbose_name=_("Non-indigenous people affected"),
        help_text=_("What other group or groups of people are affected by this project? \
                     Please separate by newline."),
        blank=True
    )

    # 1.6
    project_status = models.CharField(
        verbose_name=_("Status of Project"),
        help_text=_("What is the status of the current project?"),
        max_length=6,
        choices=PROJECT_STATUS_CHOICES
    )

    # 1.7
    start_year = models.IntegerField(
        verbose_name=_("Start year"),
        help_text=_("Select the year the project was started. \
                    If the project hasn't begun, select the projected start year."),
        choices=YEAR_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 1.8
    completion_year = models.IntegerField(
        verbose_name=_("Completion year"),
        help_text=_("Select the year the project was completed. \
                    If the project hasn't finished, select the projected completion year."),
        choices=YEAR_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 1.9
    synopsis = models.TextField(
        verbose_name=_("Synopsis"),
        help_text=_("Briefly describe the project. This will be displayed at\
                    the top of the case study page. Maximum 500 chars (about \
                    3½ tweets)")
    )

    # 1.10
    full_description = models.TextField(
        verbose_name=_("Full Description"),
        help_text=_("Describe the project in full. Separate paragraphs with a\
                    new line Please add as much detail as you feel is necessary\
                    here.")
    )

    # 1.11
    project_owners = models.TextField(
        verbose_name=_("Project and facility owners"),
        help_text=_("List companies or organisations that own the project and/or facilities. Separate with a new line."),
        blank=True
    )

    # 1.12
    shareholders = models.TextField(
        verbose_name=_("Shareholders of the project owners"),
        help_text=_("List shareholders of the project owners you've just listed. Separate with a new line."),
        blank=True
    )

    # 1.13.1
    financial_institutions = MultiSelectField(
        verbose_name=_("Financial institutions"),
        help_text=_("Select any financial institutions that have or are considering extending \
                     loans or guarantees to the project."),
        choices=FINANCIAL_INSTITUTIONS,
        blank=True
    )

    # 1.13.2
    financial_institutions_other = models.TextField(
        verbose_name=_("Financial institutions – other"),
        help_text=_("List any other financial institutions not listed above. \
                     Put each on a new line."),
        blank=True
    )

    # 1.14
    energy_customers = models.TextField(
        verbose_name=_("Energy consumers"),
        help_text=_("List any wholesale energy customers that take energy from the development. E.g. 'national \
                    grids' or private energy suppliers. Please separate with a newline."),
        blank=True
    )

    # 1.15.1
    image = models.ImageField(
        verbose_name=_("Image")
    )

    # 1.15.2
    image_caption = models.CharField(
        verbose_name=_("Image caption"),
        max_length=240,
        default=None,
        null=True,
    )

    # 1.15.3
    image_credit = models.CharField(
        verbose_name=_("Image credit(s)"),
        max_length=240,
        default=None,
        null=True,
    )

    # 1.16.1
    video = models.URLField(
        verbose_name=_("Video URL"),
        help_text=_("Copy the URL to a YouTube or Vimeo video that relates to the case study."),
        max_length=80,
        validators=[validators.YouTubeOrVimeoValidator()],
        blank=True
    )

    # 1.16.2
    video_caption = models.CharField(
        verbose_name=_("Video caption"),
        max_length=240,
        blank=True,
        default=None,
        null=True,
    )

    # 1.16.3
    video_credit = models.CharField(
        verbose_name=_("Video credit(s)"),
        max_length=240,
        blank=True,
        default=None,
        null=True,
    )

    # 1.17.1
    media_coverage_mainstream = models.TextField(
        verbose_name=_("Links to media reports"),
        help_text=_("Provide any links to mainstream media coverage."),
        default=None,
        null=True,
    )

    # 1.17.2
    media_coverage_independent = models.TextField(
        verbose_name=_("Independent grassroots reports"),
        help_text=_("Provide any links to grassroots/independent media coverage."),
        default=None,
        null=True,
    )

    # 1.18.1
    community_voices = models.TextField(
        verbose_name=_("Community Voices"),
        help_text=_("Add any direct quotes from members of the community that \
                  relate to this project"),
        default=None,
        null=True,
        blank=True
    )

    # 1.18.2
    direct_comms = models.TextField(
        verbose_name=_("Reports of direct communications"),
        help_text=_("Add any reports of direct communication between community members and \
                    representatives of developers/companies/investors."),
        default=None,
        null=True,
        blank=True
    )

    # 1.18.3
    social_media_links = models.TextField(
        verbose_name=_("Social media links"),
        help_text=_("Add any links to social media accounts directly relating to the project."),
        max_length=500,
        default=None,
        null=True,
        blank=True
    )

    ##
    # Second Screen - Technical and economic analysis
    ##

    # 2.1 - Renewable Energy Generation
    # 2.1.1
    generation_technology = models.CharField(
        verbose_name=_("Generation technology"),
        help_text=_("Select the type of renewable energy generation that most applies to this case study."),
        max_length=4,
        choices=GENERATION_TECHNOLOGY_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 2.1.1.12
    # Should be filled in if 2.1.1 was answered as biogas or biomass.
    biomass_detail = models.CharField(
        verbose_name=_("Description of feedstock"),
        help_text=_("If you selected biogas or biomass, please describe the feedstock (where the fuel came from e.g. \
                   corn, algae, anaerobic digestion, commercial waste etc)"),
        max_length=200,
        default=None,
        null=True,
        blank=True
    )

    # 2.1.1.14
    generation_technology_other = models.CharField(
        verbose_name=_("Other generation type"),
        help_text=_("If you selected other, please specify the generation technology (e.g. tidal, wave etc)"),
        max_length=200,
        default=None,
        null=True,
        blank=True
    )

    # 2.1.2
    total_generation_capacity = models.PositiveIntegerField(
        verbose_name=_("Total generation capacity (in kW)"),
        help_text=_("Please enter the total generation capacity of the project in kW"),
        default=None,
        null=True,
        blank=True,
    )

    # 2.1.3
    # TODO: Auto-completion based on previous entries so we can query case-studies with the same answer.
    generation_equipment_supplier = models.TextField(
        verbose_name=_("Generation equipment supplier"),
        help_text=_("Enter the supplier of the generation equipment. (E.g. Siemens)"),
        default=None,
        null=True,
        blank=True
    )

    # 2.1.4
    total_investment = models.IntegerField(
        verbose_name=_("Total investment (in USD)"),
        help_text=_("The approximate total investment for the project in USD."),
        default=None,
        null=True,
        blank=True
    )

    # 2.1.5
    technical_or_economic_details = models.TextField(
        verbose_name=_("Additional technical or economic details"),
        help_text=_("Specify any additional technical or economic details relating to the project."),
        blank=True
    )

    # 2.2 - Power Grids / Energy Storage
    # 2.2.1
    power_technology = models.CharField(
        verbose_name=_("Power technology"),
        help_text=_("Select the related energy technology."),
        max_length=2,
        choices=POWER_TECHNOLOGY_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.1.4
    power_technology_other = models.CharField(
        verbose_name=_("Other power technology"),
        help_text=_("If you answered 'others', please specify the power technologies."),
        max_length=128,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.2
    energy_storage_capacity = models.DecimalField(
        verbose_name=_("Energy storage capacity"),
        help_text=_("Enter the total capacity of the energy storage system in kilowatt-hours (kWh)."),
        max_digits=20,
        decimal_places=3,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.2.1
    maximum_power_output = models.DecimalField(
        verbose_name=_('Maximum power output'),
        help_text=_('Enter the maximum power output of the storage system in kilowatts (kW).'),
        max_digits=12,
        decimal_places=3,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.2.2
    discharge_time = models.DecimalField(
        verbose_name=_('Time for discharge from full capacity'),
        help_text=_('Enter the time it takes to discharge from full capacity at maximum power output (in hours).'),
        max_digits=6,
        decimal_places=3,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.3
    contractor_or_supplier_of_technology = models.CharField(
        verbose_name=_('Contractor and/or supplier of technology'),
        help_text=_('List companies that act as contractors or suppliers of technology related to energy storage.'),
        max_length=256,
        default=None,
        null=True,
        blank=True
    )

    # 2.2.4
    approximate_total_investment = models.PositiveIntegerField(
        verbose_name=_('Approximate total investment'),
        help_text=_('Enter the approximate total investment in USD ($).'),
        default=None,
        null=True,
        blank=True
    )

    # 2.2.5
    additional_technical_details = models.CharField(
        verbose_name=_("Additional technical or economic details"),
        help_text=_("Add any additional details such as: length, from-to, voltage, substations etc"),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.1.1
    minerals_or_commodities = models.CharField(
        verbose_name=_("Mineral commodity/commodities"),
        help_text=_("Select the mineral commodity that is primarily mined in this project"),
        max_length=3,
        choices=MINERAL_COMMODITY_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.1.2
    minerals_or_commodities_other = models.CharField(
        verbose_name=_("Other mineral commodity"),
        help_text=_("Enter the mineral commodity that isn't in the list."),
        max_length=64,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.2
    use_in_energy_economy = models.CharField(
        verbose_name=_("Potential use in renewable energy economy"),
        help_text=_("Select the potential use of the minerals in the renewable energy economy"),
        max_length=3,
        choices=USE_IN_ENERGY_ECONOMY_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.2.9
    use_in_energy_economy_other = models.CharField(
        verbose_name=_('Other use in energy economy'),
        max_length=128,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.3.1
    project_life_span = models.CharField(
        verbose_name=_("Project life span"),
        help_text=_("e.g. 12 years of production, 15 years overall"),
        max_length=200,
        blank=True
    )

    # 2.3.3.2
    size_of_concessions = models.CharField(
        verbose_name=_("Size of concessions"),
        help_text=_("Describe the size of concession(s) granted to company/companies (e.g. 'one concession encompassing\
                    2,300 hectares')"),
        max_length=200,
        null=True,
        default=None,
        blank=True
    )

    # 2.3.3.3
    projected_production_of_commodities = models.CharField(
        verbose_name=_("Projected production of key commodities"),
        help_text=_("Describe the projected production of commodities per annum and overall (e.g. '40 million tonnes of\
            iron ore per year, 200 million tonnes over 5 year life of mine'"),
        max_length=256,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.4
    type_of_extraction = models.CharField(
        verbose_name=_("Type of extraction"),
        max_length=3,
        choices=TYPE_OF_EXTRACTION_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 2.3.5
    associated_infrastructure = models.CharField(
        verbose_name=_("Associated infrastructure in the locality"),
        help_text=_("List any associated infrastructure in the locality (e.g. tailings dams/mine waste storage and \
        treatment facilities; ore processing facilities; smelting facilities; hydroelectric dams/energy infrastructure;\
         transport infrastructure e.g. roads or rail."),
        max_length=256,
        default=None,
        null=True,
        blank=True
    )

    ##
    # Third Screen - Socio-economic analysis
    ##

    # 3.1.1
    positive_case_type = models.CharField(
        verbose_name=_('What kind of positive case is this entry about?'),
        help_text=_('Select the most relevant type of positive case'),
        choices=POSITIVE_CASE_TYPE_CHOICES,
        max_length=4,
        default=None,
        null=True,
        blank=True,
    )

    # 3.1.2
    socioeconomic_benefits = models.TextField(
        verbose_name=_('Socio-economic benefits'),
        help_text=_('Please expand on your response given in the full description on page one. We would expect \
            benefits to go beyond emissions savings, paying rent for land, or complying with environmental or social \
            legislation'),
        default=None,
        null=True,
        blank=True
    )

    # 3.1.3 + 3.2.5
    key_actors_involved = models.TextField(
        verbose_name=_('Key actors involved (individual/organisational)'),
        blank=True, null=True
    )

    # 3.1.4
    project_status_detail = models.TextField(
        verbose_name=_('Current status of the project'),
        help_text=_("Describe the current status of the project, expanding beyond 'existing', 'under construction' etc"),
        default=None,
        null=True,
        blank=True
    )

    # 3.1.5
    obstacles_and_hindrances = models.CharField(
        verbose_name=_('Obstacles and hindrances'),
        help_text=_('List any obstacles or hindrances experienced in the course of the project'),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 3.1.6
    identified_partnerships = models.CharField(
        verbose_name=_('Identified partnerships'),
        help_text=_('Are you looking for partnerships or have any clearly identified need? If so, please describe it \
                    here.'),
        max_length=256,
        default=None,
        null=True,
        blank=True
    )

    # 3.1.7.1 + 3.2.8.1
    contact_email = models.EmailField(
        verbose_name=_('Email address'),
        blank=True
    )

    # 3.1.7.2 + 3.2.8.1
    contact_phone = PhoneNumberField(
        verbose_name=_('Phone number'),
        help_text=_('Please include the international prefix, beginning with "+".'),
        blank=True
    )

    # 3.1.7.3 + 3.2.8.1
    contact_website = models.URLField(
        verbose_name=_('Website'),
        blank=True
    )

    # 3.1.7.4 + 3.2.8.1
    contact_twitter = models.CharField(
        verbose_name=_('Twitter username'),
        max_length=50,
        blank=True
    )

    # 3.1.7.5 + 3.2.8.1
    contact_facebook = models.URLField(
        verbose_name=_('Facebook page'),
        blank=True
    )

    # 3.1.7.6 + 3.2.8.1
    contact_other = models.TextField(
        verbose_name=_('Other contact details'),
        blank=True
    )

    # 3.2.1
    negative_case_reasons = MultiSelectField(
        verbose_name=("Reasons this is a negative case study"),
        choices=NEGATIVE_CASE_REASONS_CHOICES,
        default=None,
        null=True,
        blank=True
    )

    # 3.2.1.9
    negative_case_reasons_other = models.CharField(
        verbose_name=_("Other reason for negative case"),
        help_text=_("Please include other reasons, noting that we aim to focus on projects with substantive negative \
                    impacts on vulnerable groups."),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 3.2.2
    negative_socioenvironmental_impacts = models.TextField(
        verbose_name=_("Describe the negative socio-environmental impacts"),
        help_text=_("Provide a detailed description of the negative socio-environmental impacts (please provide all \
                    relevant details, such as type of ecosystem and presence of any existing reserve in the area, \
                    , specific communities affected by the project, total geographic footprint of the project, and \
                    tenure system affected in the case of land grabs, kind of permits that were irregularly issued if \
                    this is the case."),
        default=None,
        null=True,
        blank=True
    )

    # 3.2.3
    isolated_or_widespread = models.TextField(
        verbose_name=_("Describe if the project is isolated or commonplace."),
        help_text=_("Is this an isolated project or are there similar projects in the same geographic area? If there \
                    are more, can you describe them? Are there any significant cumulative synergistic effects?"),
        default=None,
        null=True,
        blank=True
    )

    # 3.2.4.1
    when_did_organising_start = models.CharField(
        verbose_name=_("When did local organising efforts begin?"),
        help_text=_("Before the project started? During project implementation? After project implementation? \
                    Describe in your own words."),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 3.2.4.2
    who_has_been_involved = models.TextField(
        verbose_name=_("Which communities, groups and organisations have been involved?"),
        blank=True, null=True
    )

    # 3.2.4.3
    participation_mechanisms = models.TextField(
        verbose_name=_("What mechanisms of participation have been used?"),
        help_text=_("e.g. direct action, local referendums, legal cases, letters or petitions etc"),
        blank=True
    )

    # 3.2.6
    potential_partnerships = models.CharField(
        verbose_name=_("Describe potential partnerships"),
        help_text=_("Are you looking for partnerships or do you have any clearly identified need? If so, please \
                    describe it here."),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 3.2.7
    wants_conversation_with_ojuso = models.BooleanField(
        verbose_name=_("Would you like to have a conversation with the ojuso team?"),
        help_text=_("This would be a conversation about challenging or engaging related developers, companies and \
                    investors."),
        default=True
    )

    ##
    # Fourth Screen - Uploads
    ##

    # 4.1
    official_project_documents = models.ManyToManyField(
        'files.File',
        related_name='official_project_document_for',
        verbose_name=_("Official project documents"),
        help_text=_("Attach any legal or official documents that relate to the project."),
        blank=True,
    )

    # 4.2
    other_documents = models.ManyToManyField(
        'files.File',
        related_name='other_document_for',
        verbose_name=_("Other documents"),
        help_text=_("Attach any other documents that relate to the project."),
        blank=True,
    )

    # 4.3.1
    shapefiles = models.ManyToManyField(
        'files.File',
        related_name='shapefile_for',
        verbose_name=_("Shapefiles"),
        help_text=_("If you have territory that you would like to show in relation to this project - e.g. Bienes \
                    Comunales de Ixtepec etc. This is a set of 3 or more (often 5-6) files with file extensions like \
                    .cpg, .dbf, .prj, .qpj, .shp, .shx"),
        blank=True
    )

    # 4.3.2
    coordinate_reference_system = models.ForeignKey(
        SpatialRefSys,
        null=True,
        blank=True,
        default=4326
    )

    # 4.3.3
    name_of_territory_or_area = models.CharField(
        verbose_name=_("Name of territory or area"),
        max_length=512,
        default=None,
        null=True,
        blank=True
    )

    # 4.4
    shown_on_other_platforms = models.BooleanField(
        verbose_name=_("Is this case study shown on other platforms?"),
        default=True
    )

    # 4.4.1
    shown_on_other_platforms_detail = models.TextField(
        verbose_name=_("Shown on other platforms - Detail"),
        help_text=_("Please provide links to other places the case study appears."),
        blank=True
    )

    objects = CaseStudyQuerySet.as_manager()

    def __str__(self):
        """The String representation of the case study. (Entry name with country name.)"""
        return "%s in %s" % (self.entry_name, self.country.name)

    def clean(self, *args, **kwargs):
        """Perform validation on the model as a whole and throw a ValidationError if anything isn't how it should be."""
        pass

    def save(self, *args, **kwargs):
        """Override the save method to create a slug when the model is created. Slug is only created and never modified
        as we are basing our URLs on it and don't want it to change - ever."""
        if not self.pk:
            # Newly created object, so set slug
            self.slug = slugify(self.entry_name)
        # Continue normal save method by calling original save method.
        super(CaseStudy, self).save(*args, **kwargs)

    def is_video_youtube(self):
        return self.video.count("youtube.com") > 0

    def get_youtube_id(self):
        """Gets the 11 character YouTube video ID from the video field."""
        return parse.parse_qs(parse.urlparse(self.video).query)["v"][0]

    def is_video_vimeo(self):
        return self.video.count("vimeo.com") > 0

    def get_vimeo_id(self):
        """Gets the 11 number video ID from the video field."""
        return parse.urlparse(self.video).path

    def get_negative_case_reasons_no_other(self):
        """Return a list of negative case reasons, minus the 'other' choice (if selected)"""
        choices = self.get_negative_case_reasons_list()

        if choices.count(self.NEGATIVE_CASE_REASONS_OTHER_TEXT) > 0:
            choices.remove(self.NEGATIVE_CASE_REASONS_OTHER_TEXT)

        return choices

    def get_renewable_generation_detail(self):
        """Prepend appropriate descriptive text when accessing renewable generation type."""

        if self.generation_technology:
            if self.generation_technology.endswith('WE'):
                return _('Wind energy') + " – " + self.get_generation_technology_display()
            elif self.generation_technology.endswith('PV'):
                return _('Photovoltaic electricity') + " – " + self.get_generation_technology_display()
            elif self.generation_technology.endswith('HYD'):
                return _('Hydroelectric') + " – " + self.get_generation_technology_display()
            elif self.generation_technology == 'OTHR':
                return self.generation_technology_other
            else:
                return self.get_generation_technology_display()

        else:
            return ""

    class Meta:
        verbose_name_plural = 'case studies'