from django.contrib import admin

from tracker.models import (
    DailyNote,
    DoseLog,
    GlobalNote,
    Medication,
    PulseReading,
    ReminderSent,
    ScheduledDose,
)


class ScheduledDoseInline(admin.TabularInline):
    """Edit a medication's daily doses (and their reminder times) on the medication page."""

    model = ScheduledDose
    extra = 1


@admin.register(Medication)
class MedicationAdmin(admin.ModelAdmin):
    list_display = ["name", "is_active", "schedule_summary"]
    list_filter = ["is_active"]
    search_fields = ["name"]
    inlines = [ScheduledDoseInline]

    @admin.display(description="Schedule")
    def schedule_summary(self, obj: Medication) -> str:
        doses = obj.scheduled_doses.filter(is_active=True)
        if not doses:
            return "—"
        return ", ".join(
            f"{d.amount} {d.get_time_of_day_display().lower()}" for d in doses
        )


@admin.register(ScheduledDose)
class ScheduledDoseAdmin(admin.ModelAdmin):
    list_display = ["medication", "time_of_day", "amount", "reminder_time", "is_active"]
    list_filter = ["is_active", "time_of_day", "medication"]


@admin.register(ReminderSent)
class ReminderSentAdmin(admin.ModelAdmin):
    """Read-only trail of which reminders went out, for when one seems to be missing."""

    list_display = ["date", "scheduled_dose", "sent_at"]
    list_filter = ["date"]

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False


@admin.register(DoseLog)
class DoseLogAdmin(admin.ModelAdmin):
    """The history. Day-to-day ticking off happens on the Today page."""

    list_display = ["date", "scheduled_dose", "taken", "taken_at"]
    list_filter = ["taken", "date", "scheduled_dose__medication"]
    date_hierarchy = "date"


@admin.register(PulseReading)
class PulseReadingAdmin(admin.ModelAdmin):
    list_display = ["date", "bpm", "notes"]
    date_hierarchy = "date"


@admin.register(DailyNote)
class DailyNoteAdmin(admin.ModelAdmin):
    """The journal. Day-to-day writing happens on the Today page."""

    list_display = ["date", "preview", "updated_at"]
    date_hierarchy = "date"
    search_fields = ["body"]

    @admin.display(description="Note")
    def preview(self, obj: DailyNote) -> str:
        return obj.body[:80]


@admin.register(GlobalNote)
class GlobalNoteAdmin(admin.ModelAdmin):
    """The one shared note. It can be edited here, but never added or deleted."""

    list_display = ["__str__", "updated_at"]

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return False