import 'package:flutter/material.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';

import 'package:miler/data/service_profile.dart';
import 'package:miler/views/helpers/constants/Colorconstants.dart';

/// Canonical lifecycle status for a booking/stop, parsed from the backend's
/// free-form `orderstatus` string.
///
/// Status used to be compared as raw string literals in ~90 places, with
/// case-sensitivity landmines (`'active'` vs `'ACTIVE'`) and variant spellings
/// (`'picked'` / `'picked up'` / `'pickuped'`). This normalizes all of that in
/// one place so filters agree everywhere.
///
/// NOTE: this is the *read* side. The status-change API still sends its own
/// protocol verbs (`ACCEPTED`/`ARRIVED`/`PICKED`/`REJECTED`/`CANCELLED`) — see
/// [OrderAction] for those canonical write values.
enum StopStatus {
  newStop,
  assigned,
  accepted,
  active,
  arrived,
  picked,

  /// ── The milk run's second half ──
  ///
  /// [picked] is where a logistics stop ends: the parcel is collected and it
  /// becomes the hub's problem. A milk run does not end there — collection is
  /// the middle of the day, and the rider still has to carry the load to the
  /// customers.
  ///
  /// So these three rungs exist for the line that has them, and only that line
  /// puts a stop into them. Keeping them in the same enum is what lets one
  /// `stopStatusOf` test serve both halves of the day; keeping them *distinct
  /// from* [picked] and [arrived] is what stops a collected crate being
  /// reported as fifteen delivered lunches ninety minutes early.
  ///
  /// The load is released and the rider is driving his round.
  outForDelivery,

  /// At a customer's door — not at a source. The distinction matters: the
  /// pickup [arrived] and this one are different places, different actions and
  /// different next steps.
  deliveryArrived,

  /// Handed over. Terminal for a milk-run stop, the way [picked] is terminal
  /// for a logistics one.
  delivered,

  skipped,
  cancelled,
  rejected,
  unknown,
}

/// Normalizes any raw `orderstatus` value (case-insensitive, trimmed, variant
/// spellings folded) into a [StopStatus].
StopStatus stopStatusFromRaw(dynamic raw) {
  final s = (raw?.toString() ?? '').trim().toLowerCase();
  switch (s) {
    case 'new':
      return StopStatus.newStop;
    case 'assigned':
    case 'miler_assigned':
    case 'pending':
      return StopStatus.assigned;
    // ── The backend's own word for accepted ──
    //
    // Confirmed by the backend team: `pickup_scheduled` is what a booking sits
    // on once the rider has accepted it. It parsed as [StopStatus.unknown] —
    // so the rung the pickup UI reads had nothing in it, and any *other* field
    // that did parse won by default.
    case 'pickup_scheduled':
    case 'pickupscheduled':
    case 'accepted':
      return StopStatus.accepted;
    case 'active':
      return StopStatus.active;
    case 'arrived':
    // ── The server's own spellings for the same rung ──
    //
    // `Arrived_At_Pickup` is what `POST /miler/bookings/:id/reached` now
    // persists, and `At_Customer` is the undocumented variant the backend was
    // observed sending before it. Neither parsed: both fell to
    // [StopStatus.unknown], so the rung the rider had just reported would have
    // been dropped the moment the backend started returning it — the same
    // symptom the local compatibility store exists to paper over, arriving by
    // a different route.
    //
    // `ApiConfig.legacyStatusFromNew` already folds this into `arrived` for
    // rows that come through the booking adapter. This is the other door: a raw
    // status read straight off a row, which is what `_fetchQueues` does.
    //
    // ── `At_Customer` — settled, and it means arrived at the PICKUP ──
    //
    // This word was read two ways: `ApiConfig` folded it to *arrived at
    // pickup*, and the delivery case further down this switch folded it to
    // [StopStatus.deliveryArrived]. Both could not be right, and a wrong guess
    // moves a stop between the two halves of the rider's day — so it was left
    // unparsed rather than settled on a hunch.
    //
    // The backend team answered it: `At_Customer` is a
    // `milerprofiles.availabilitystatus` value, not a booking or consignment
    // state, so it says where the **rider** is and not where the parcel is. The
    // only thing that writes it is `POST /miler/bookings/:id/reached` — the
    // pickup-arrival action. Nothing sets it on a delivery leg; a rider heading
    // to a receiver goes `On_Delivery`. The name is misleading and predates the
    // current lifecycle.
    //
    // So it belongs here, with the other spellings of the pickup arrival.
    // `ApiConfig` was right and this file was wrong.
    case 'arrived_at_pickup':
    case 'arrivedatpickup':
    case 'at customer':
    case 'at_customer':
      return StopStatus.arrived;
    // ── The two words that mean the pickup is done ──
    //
    // Also confirmed by the backend team, and also unparsed until now:
    // `converted_to_consignment` is what the booking becomes when
    // `pickup-complete` converts it, and `picked_up` is the same fact said
    // plainly. Both are the **pickup milestone**, and both must outrank
    // whatever the *delivery* lifecycle has moved on to — see
    // [MilkRun.stageOf], which is where that precedence lives.
    //
    // This is the other half of "Picked showed as Active": with these
    // unparsed, `active` was the only word on the row the app could read.
    case 'converted_to_consignment':
    case 'convertedtoconsignment':
    case 'picked_up':
    case 'picked':
    case 'picked up':
    case 'pickuped':
    case 'pickedup':
      return StopStatus.picked;
    // The milk run's delivery rungs. `out_for_delivery` is also the backend's
    // own consignment status, spelled its way, so a stop stamped from either
    // side folds to the same state.
    case 'outfordelivery':
    case 'out_for_delivery':
    case 'out for delivery':
    case 'delivering':
      return StopStatus.outForDelivery;
    case 'deliveryarrived':
    case 'delivery_arrived':
      return StopStatus.deliveryArrived;
    case 'delivered':
      return StopStatus.delivered;
    case 'skipped':
      return StopStatus.skipped;
    case 'cancelled':
    case 'canceled':
      return StopStatus.cancelled;
    case 'rejected':
      return StopStatus.rejected;
    default:
      return StopStatus.unknown;
  }
}

/// Parse straight from a booking map's `orderstatus`.
StopStatus stopStatusOf(Map<String, dynamic> booking) =>
    stopStatusFromRaw(booking['orderstatus']);

extension StopStatusX on StopStatus {
  bool get isPicked => this == StopStatus.picked;
  bool get isCancelled => this == StopStatus.cancelled;
  bool get isSkipped => this == StopStatus.skipped;
  bool get isActive => this == StopStatus.active;
  bool get isRejected => this == StopStatus.rejected;

  /// On the customer round: released, at a door, or handed over.
  bool get isDeliveryLeg =>
      this == StopStatus.outForDelivery ||
      this == StopStatus.deliveryArrived ||
      this == StopStatus.delivered;

  /// Handed to the customer. Terminal on a milk run.
  bool get isDelivered => this == StopStatus.delivered;

  /// ── "Is this stop finished?" is a question about the LINE ──
  ///
  /// This is the distinction that broke the milk run, so it is worth being
  /// exact about.
  ///
  /// On **logistics**, collecting the parcel *is* the job: [picked] is the end,
  /// the booking becomes a consignment, and the hub takes it from there.
  ///
  /// On a **milk run**, [picked] is the *middle of the morning*. The rider is
  /// holding fifteen lunches and has not delivered one of them. His day ends at
  /// [delivered], one customer at a time.
  ///
  /// One boolean answered both, and it answered "picked = finished". So a
  /// milk-run order collected at a kitchen was dropped from the deliveries list
  /// as completed work and filed on Activity as history — before the rider had
  /// left the counter. He collected five lunches and watched them disappear
  /// into his own history.
  ///
  /// Read this, not [isTerminal], anywhere the question is "should this stop
  /// still be worked today?".
  bool get isWorkComplete => ServiceProfile.active.deliversToCustomer
      ? (this == StopStatus.delivered || this == StopStatus.cancelled)
      : (this == StopStatus.picked ||
            this == StopStatus.delivered ||
            this == StopStatus.cancelled);

  /// Every state that ends a stop on *some* line, without asking which.
  ///
  /// Only for code that must not depend on the active profile — a pure store
  /// helper, say. Screens want [isWorkComplete].
  bool get isTerminal =>
      this == StopStatus.picked ||
      this == StopStatus.delivered ||
      this == StopStatus.cancelled;

  /// The old name for [isWorkComplete], kept because ~8 call sites read it and
  /// they all want the line-aware answer.
  bool get isFinishedPickup => isWorkComplete;

  /// Still awaiting the rider's acceptance — belongs on Home, not Bookings.
  bool get isPending =>
      this == StopStatus.newStop || this == StopStatus.assigned;

  /// What this state is *called*, in the rider's words.
  ///
  /// The status vocabulary had been re-invented per widget: the live banner had
  /// its own switch over raw `orderstatus` strings returning "At pickup" and
  /// "In progress", the trip card wrote 'Accepted' as a literal, and the two
  /// disagreed about the same backend state. A rider moving between Home, the
  /// banner and Bookings was reading three vocabularies for one lifecycle and
  /// re-learning the app at each stop.
  ///
  /// One list, here, next to the parser that produces the states — so a new
  /// status cannot be added without someone deciding what to call it.
  String get label => switch (this) {
    StopStatus.newStop => 'New',
    StopStatus.assigned => 'Assigned',
    StopStatus.accepted => 'Accepted',
    StopStatus.active => 'In progress',
    StopStatus.arrived => 'At the stop',
    StopStatus.picked => 'Picked up',
    StopStatus.outForDelivery => 'Out for delivery',
    StopStatus.deliveryArrived => 'At the customer',
    StopStatus.delivered => 'Delivered',
    StopStatus.skipped => 'Skipped',
    StopStatus.cancelled => 'Cancelled',
    StopStatus.rejected => 'Rejected',
    StopStatus.unknown => 'Active',
  };

  /// The colour that name is drawn in.
  ///
  /// Next to [label] for the same reason the labels are here: a status cannot
  /// be added without somebody deciding both what it is called and how loud it
  /// is. Semantic, not decorative — green means the rider is done with it, red
  /// means it needs him now, grey means it is waiting on somebody else.
  Color get color => switch (this) {
    StopStatus.newStop || StopStatus.assigned => ColorConstants.secondaryText,
    StopStatus.accepted => ColorConstants.acceptGreen,
    StopStatus.active || StopStatus.arrived => ColorConstants.pickupAccent,
    StopStatus.picked => ColorConstants.acceptGreen,
    // ── Loud, but in the leg's own colour ──
    //
    // These wore the brand red, and on the stop sheet that word sat between a
    // blue leg disc and a blue "what to do here" chip, one line above a red
    // Navigate button — a status dressed as an action, on a screen that codes
    // its delivery leg blue everywhere else. The round is still drawn loudly;
    // it is drawn in the ink that already means *delivery leg*, which is the
    // same rule that keeps the pickup-leg states on the pickup accent above.
    StopStatus.outForDelivery ||
    StopStatus.deliveryArrived => ColorConstants.deliveryAccent,
    StopStatus.delivered => ColorConstants.acceptGreen,
    StopStatus.skipped => ColorConstants.warning,
    StopStatus.cancelled || StopStatus.rejected => ColorConstants.errorRed,
    StopStatus.unknown => ColorConstants.secondaryText,
  };

  /// A glyph for the same state, so the tag never depends on colour alone —
  /// these are read in sunlight, through a scratched screen, at a gate.
  IconData get icon => switch (this) {
    StopStatus.newStop || StopStatus.assigned => LucideIcons.clock,
    StopStatus.accepted => LucideIcons.circleCheck,
    StopStatus.active => LucideIcons.bike,
    StopStatus.arrived => LucideIcons.mapPin,
    StopStatus.picked => LucideIcons.package,
    StopStatus.outForDelivery => LucideIcons.truck,
    StopStatus.deliveryArrived => LucideIcons.mapPin,
    // ── Delivered is settled, not decorated ──
    //
    // `verified_rounded` is a starburst badge — the shape Material reserves
    // for *verified account*, and the loudest glyph in the set. Down a column
    // of finished stops it made every completed delivery look like an award.
    // A package with a tick on it says the same thing about the same object,
    // quietly, and it is the mark every delivery app in the world uses.
    StopStatus.delivered => LucideIcons.packageCheck,
    // Skipped must not read as a variant of delivered. A circle with a stroke
    // through it is the "attempted, did not happen" mark; `replay` promised a
    // retry the rider may not actually be able to make.
    StopStatus.skipped => LucideIcons.circleSlash,
    StopStatus.cancelled || StopStatus.rejected => LucideIcons.ban,
    StopStatus.unknown => LucideIcons.circle,
  };
}

/// Canonical protocol verbs sent to the status-change API (the *write* side).
class OrderAction {
  static const String accept = 'ACCEPT';
  static const String accepted = 'ACCEPTED';
  static const String arrived = 'ARRIVED';
  static const String picked = 'PICKED';
  static const String rejected = 'REJECTED';
  static const String cancelled = 'CANCELLED';

  /// The milk run's second half. These are *client* verbs — they name what the
  /// rider did, and each one maps to a real backend call rather than to a
  /// status string the API would not recognise:
  ///
  ///   startDelivery    → POST /miler/deliveries/start
  ///   deliveryArrived  → (local; the round has no per-stop arrival route)
  ///   delivered        → POST /miler/consignments/:id/deliver
  ///
  /// See the mapping table in `MilkRun`.
  static const String startDelivery = 'START_DELIVERY';
  static const String deliveryArrived = 'DELIVERY_ARRIVED';
  static const String delivered = 'DELIVERED';
}