// Models/LocalScheduledInspection.swift
// --------------------------------------
// SwiftData model for planned/recurring inspection assignments (phase36).
//
// Read-only reference data pulled from the server (GET /api/v1/scheduled-inspections)
// and refreshed by SyncManager.pullScheduledInspections() — never created or
// mutated on device. Surfaced in the "Scheduled" section on the Dashboard and
// My Inspections. Tapping "Start" opens the normal new-inspection flow with the
// facility + template preselected; the schedule lifecycle (fulfil / roll-forward)
// stays server-driven.
//
// Follows the same pattern as LocalFacility / LocalArea: a `.unique` serverId
// WITHOUT an inline default (a default on the unique key breaks @Model's
// PersistentModel conformance) and a full init(from:)/update(from:) pair.

import Foundation
import SwiftData

@Model
final class LocalScheduledInspection {

    /// Server ID of the ScheduledInspection row — stable unique identity.
    @Attribute(.unique) var serverId: Int

    var facilityServerId: Int
    var facilityName: String
    var templateServerId: Int
    var templateName: String
    var inspectorId: Int?

    var frequency: String            // once | daily | weekly | monthly
    var frequencyLabel: String

    /// Raw server date string "YYYY-MM-DD" — sortable (ISO strings sort
    /// chronologically) and the source for the parsed `nextDue`.
    var dueDateString: String

    var isOverdue: Bool
    var notes: String?

    /// Set on device the moment an inspection fulfilling this schedule is
    /// submitted, so the SCHEDULED lists hide the row immediately — online or
    /// offline — without waiting for the round trip.
    ///
    /// Purely a display flag. The schedule lifecycle stays server-driven: the
    /// next successful pull calls `update(from:)`, which clears this and writes
    /// the authoritative `next_due_date`. If the submission never lands, the
    /// server still reports the schedule as due and the row simply comes back —
    /// self-healing.
    ///
    /// This exists instead of deleting the row. A recurring schedule is
    /// returned by the server *again* after it rolls forward, so deleting meant
    /// delete-then-reinsert against an `@Attribute(.unique)` key on every
    /// completion, and the reinserted row did not reliably carry the new due
    /// date. Flagging keeps `update(from:)` — the path that has always worked —
    /// as the only way a cached row's dates ever change.
    ///
    /// Non-optional with an inline default, so SwiftData migrates lightweight
    /// (CLAUDE.md rule 12): existing rows read as `false`, no app reinstall.
    var fulfilledLocally: Bool = false

    /// Manager-authored instructions for this occurrence, normalised.
    ///
    /// The wire field, the server model attribute and the DB column are all
    /// still `notes` — only the user-facing wording changed to "Instructions"
    /// (web form label + both iPad surfaces). Renaming the stored property would
    /// break `init(from:)`/`update(from:)` against `APIScheduledInspection.notes`
    /// for no benefit, so the rename lives here.
    ///
    /// Returns nil for nil, empty, or whitespace-only text so callers can guard
    /// with a single `if let` instead of repeating the emptiness check.
    /// Computed, not stored — no SwiftData schema change.
    var instructions: String? {
        guard let t = notes?.trimmingCharacters(in: .whitespacesAndNewlines),
              !t.isEmpty
        else { return nil }
        return t
    }

    /// Last time this row was refreshed from the server pull.
    var updatedAt: Date

    /// Parsed due date for display. Computed properties are not persisted by
    /// SwiftData; sort on `dueDateString` (not this) in @Query.
    var nextDue: Date? {
        Self.dateOnlyFormatter.date(from: dueDateString)
    }

    private static let dateOnlyFormatter: DateFormatter = {
        let f = DateFormatter()
        f.locale     = Locale(identifier: "en_US_POSIX")
        f.dateFormat = "yyyy-MM-dd"
        return f
    }()

    init(from api: APIScheduledInspection) {
        self.serverId         = api.id
        self.facilityServerId = api.facilityId
        self.facilityName     = api.facilityName ?? ""
        self.templateServerId = api.templateId
        self.templateName     = api.templateName ?? ""
        self.inspectorId      = api.inspectorId
        self.frequency        = api.frequency
        self.frequencyLabel   = api.frequencyLabel ?? ""
        self.dueDateString    = api.nextDueDate ?? ""
        self.isOverdue        = api.isOverdue
        self.notes            = api.notes
        self.fulfilledLocally = false
        self.updatedAt        = Date()
    }

    func update(from api: APIScheduledInspection) {
        self.facilityServerId = api.facilityId
        self.facilityName     = api.facilityName ?? ""
        self.templateServerId = api.templateId
        self.templateName     = api.templateName ?? ""
        self.inspectorId      = api.inspectorId
        self.frequency        = api.frequency
        self.frequencyLabel   = api.frequencyLabel ?? ""
        self.dueDateString    = api.nextDueDate ?? ""
        self.isOverdue        = api.isOverdue
        self.notes            = api.notes
        // The server is authoritative. Being returned by the pull at all means
        // this schedule is live again — for a recurring one, on its NEXT
        // occurrence — so any local "just did it" flag is stale by definition.
        self.fulfilledLocally = false
        self.updatedAt        = Date()
    }
}