//
//  DataControllerADD.swift
//  Feels
//
//  SwiftData CREATE operations.
//

import SwiftData
import Foundation

extension DataController {
    func add(mood: Mood, forDate date: Date, entryType: EntryType) {
        // Delete existing entry for this date if present
        if let existing = getEntry(byDate: date) {
            modelContext.delete(existing)
            try? modelContext.save()
        }

        let entry = MoodEntryModel(
            forDate: date,
            mood: mood,
            entryType: entryType
        )

        modelContext.insert(entry)
        EventLogger.log(event: "add_entry", withData: ["entry_type": entryType.rawValue])
        saveAndRunDataListeners()
    }

    func fillInMissingDates() {
        let currentOnboarding = UserDefaultsStore.getOnboarding()
        var endDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: currentOnboarding)
        // Since it's for views, take away the last date so vote is enabled
        endDate = Calendar.current.date(byAdding: .day, value: -1, to: endDate)!

        let descriptor = FetchDescriptor<MoodEntryModel>(
            sortBy: [SortDescriptor(\.forDate, order: .reverse)]
        )

        guard let entries = try? modelContext.fetch(descriptor),
              let firstEntry = entries.last else { return }

        let allDates: [Date] = Date.dates(from: firstEntry.forDate, toDate: endDate, includingToDate: true).map {
            Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: $0)!
        }

        let existingDates: Set<Date> = Set(entries.map {
            Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: $0.forDate)!
        })

        let missing = Array(Set(allDates).subtracting(existingDates)).sorted(by: >)

        for date in missing {
            // Add 12 hours to avoid UTC offset issues
            let adjustedDate = Calendar.current.date(byAdding: .hour, value: 12, to: date)!
            add(mood: .missing, forDate: adjustedDate, entryType: .filledInMissing)
        }

        if !missing.isEmpty {
            EventLogger.log(event: "filled_in_missing_entries", withData: ["count": missing.count])
        }
    }

    func fixWrongWeekdays() {
        let data = getData(startDate: Date(timeIntervalSince1970: 0), endDate: Date(), includedDays: [])
        for entry in data {
            entry.weekDay = Calendar.current.component(.weekday, from: entry.forDate)
        }
        save()
    }

    func removeNoForDates() {
        // Note: With SwiftData's non-optional forDate, this is essentially a no-op
        // Keeping for API compatibility
        EventLogger.log(event: "removed_entry_no_for_date", withData: ["count": 0])
    }
}