import json

from django.conf import settings
from django.contrib import admin
from django.utils.html import format_html

from .models import (
    ProductSpecification, SpecParameter,
    Facility, OriginZone, CollectorGroup, HarvestIntake, IntakeBatchLineage,
    DueDiligenceCase, EUDREvidence, RiskAssessment, MitigationAction,
    DueDiligenceStatementReference,
)


class SpecParameterInline(admin.TabularInline):
    model = SpecParameter
    extra = 0


@admin.register(ProductSpecification)
class ProductSpecificationAdmin(admin.ModelAdmin):
    list_display = ["product", "version", "status", "is_current", "effective_from", "effective_to", "approved_at"]
    list_filter = ["status", "is_current", "product"]
    inlines = [SpecParameterInline]


@admin.register(Facility)
class FacilityAdmin(admin.ModelAdmin):
    list_display = ["name", "country", "region", "facility_type", "is_active"]


@admin.register(OriginZone)
class OriginZoneAdmin(admin.ModelAdmin):
    list_display = ["zone_code", "facility", "country", "region", "verification_status", "verified_at"]
    list_filter = ["verification_status", "country"]
    readonly_fields = ["zone_map"]

    class Media:
        css = {"all": ("vendor/leaflet/leaflet.css",)}
        js = ("vendor/leaflet/leaflet.js", "js/ixg_zone_map.js")

    @admin.display(description="Area on a map")
    def zone_map(self, obj):
        """Draw the stored polygon, so the shape can be checked by eye.

        Display only. It does not validate the geometry and it does not verify
        the zone — those are separate pieces of work.
        """
        if obj is None:
            return "Save this zone, then its area can be drawn here."

        if not obj.geometry or not obj.geometry.get("coordinates"):
            return format_html(
                '<div style="max-width:900px;padding:1rem;border:1px dashed #cbd5e1;'
                'border-radius:.375rem;color:#64748b">No polygon coordinates are stored '
                'for this zone, so there is nothing to draw. Coordinates are captured in '
                'the field, then entered on the Geometry field.</div>'
            )

        return format_html(
            '<div id="zone-map" data-geometry="{}" data-tile-url="{}" '
            'style="height:420px;max-width:900px;border:1px solid #cbd5e1;'
            'border-radius:.375rem"></div>'
            '<p style="max-width:900px;margin-top:.5rem;font-size:.8rem;color:#64748b">'
            "Drawn from the stored polygon. A view, not a check: it does not validate the "
            "geometry and it does not verify the zone.</p>",
            json.dumps(obj.geometry),
            settings.LEAFLET_TILE_URL,
        )


@admin.register(CollectorGroup)
class CollectorGroupAdmin(admin.ModelAdmin):
    list_display = ["name", "contact_reference", "origin_zone"]


@admin.register(HarvestIntake)
class HarvestIntakeAdmin(admin.ModelAdmin):
    list_display = ["intake_reference", "intake_date", "weight_kg", "grade", "origin_zone", "status"]
    list_filter = ["status"]


@admin.register(IntakeBatchLineage)
class IntakeBatchLineageAdmin(admin.ModelAdmin):
    list_display = ["batch", "harvest_intake", "weight_allocated_kg"]


@admin.register(DueDiligenceCase)
class DueDiligenceCaseAdmin(admin.ModelAdmin):
    list_display = ["batch", "status", "risk_level", "approved_at", "updated_at"]
    list_filter = ["status", "risk_level"]


@admin.register(EUDREvidence)
class EUDREvidenceAdmin(admin.ModelAdmin):
    list_display = ["case", "evidence_type", "source", "collected_at", "verified_at"]


@admin.register(RiskAssessment)
class RiskAssessmentAdmin(admin.ModelAdmin):
    list_display = ["case", "risk_level", "assessed_by", "assessed_at"]


@admin.register(MitigationAction)
class MitigationActionAdmin(admin.ModelAdmin):
    list_display = ["case", "action", "status", "owner", "due_date"]


@admin.register(DueDiligenceStatementReference)
class DueDiligenceStatementReferenceAdmin(admin.ModelAdmin):
    list_display = ["case", "dds_reference", "submission_date", "submitted_by", "reconciliation_status"]