from __future__ import annotations

from qgis.core import QgsProject
from qgis.PyQt.QtCore import Qt, QTimer, pyqtSignal
from qgis.PyQt.QtWidgets import (
    QComboBox,
    QDockWidget,
    QDoubleSpinBox,
    QFrame,
    QScrollArea,
    QSlider,
    QSpinBox,
    QVBoxLayout,
    QWidget,
)

from ..core.activation_manager import (
    is_plugin_activated,
)
from ..core.i18n import tr
from .dock.about import DockAboutMixin
from .dock.activation_state import DockActivationMixin
from .dock.auto_build import DockAutoBuildMixin
from .dock.auto_correct_build import DockAutoCorrectBuildMixin
from .dock.auto_credits import DockAutoCreditsMixin
from .dock.auto_detail_level import DockAutoDetailLevelMixin
from .dock.auto_flow_steps import DockAutoFlowStepsMixin
from .dock.auto_prompt_box import DockAutoPromptBoxMixin
from .dock.auto_prompt_gate import DockAutoPromptGateMixin
from .dock.auto_review_build import DockAutoReviewBuildMixin
from .dock.auto_review_correct import DockAutoReviewCorrectMixin
from .dock.auto_review_panel import DockAutoReviewPanelMixin
from .dock.auto_run_lifecycle import DockAutoRunLifecycleMixin
from .dock.auto_run_status import DockAutoRunStatusMixin
from .dock.build import DockBuildMixin
from .dock.handoff import DockHandoffMixin
from .dock.qgis_bridge import DockQgisBridgeMixin
from .dock.refine import DockRefineMixin
from .dock.server_switches import DockServerSwitchesMixin
from .dock.styles import (  # noqa: F401 - re-exported for other modules
    _BTN_BLUE,
    _BTN_BLUE_AUTH,
    _BTN_BLUE_PRIMARY,
    _BTN_EXPORT_DISABLED,
    _BTN_EXPORT_READY,
    _BTN_GHOST,
    _BTN_GRAY,
    _BTN_GREEN,
    _BTN_GREEN_AUTH,
    _BTN_PAIR_CANCEL,
    _BTN_PAIR_NEUTRAL,
    _BTN_RED,
    _CARD_QSS,
    _FOOTER_CTA_BTN_STYLE,
    _FOOTER_ICON_BTN_STYLE,
    _FOOTER_MENU_STYLE,
    _HELP_ICON_BTN_STYLE,
    _REFINE_COLLAPSED_HEIGHT,
    _REVIEW_CONF_MAX,
    _REVIEW_CONF_MIN,
    _REVIEW_CONF_SPIN_MIN,
    _REVIEW_CONF_STEP,
    _SLIDER_QSS,
    BRAND_BLUE,
    BRAND_BLUE_HOVER,
    BRAND_DISABLED,
    BRAND_GRAY,
    BRAND_GRAY_HOVER,
    BRAND_GREEN,
    BRAND_GREEN_TEXT,
    BRAND_RED,
    BRAND_RED_HOVER,
    BTN_GREEN,
    BTN_GREEN_DISABLED,
    BTN_GREEN_HOVER,
    DISABLED_TEXT,
    ERROR_TEXT,
    SUCCESS_TEXT,
    _snap_review_conf,
)
from .dock.ui_refresh import DockStateMixin
from .dock.widgets import (  # noqa: F401 - re-exported for other modules
    Mode,
    _FooterIconButton,
    _ModeSwitch,
    _Spinner,
    _WheelGuard,
    _ZoneGestureGlyph,
)


class AISegmentationDockWidget(
    DockBuildMixin,
    DockAutoBuildMixin,
    DockAutoReviewBuildMixin,
    DockAutoCorrectBuildMixin,
    DockRefineMixin,
    DockHandoffMixin,
    DockQgisBridgeMixin,
    DockAboutMixin,
    DockServerSwitchesMixin,
    DockActivationMixin,
    DockAutoPromptBoxMixin,
    DockAutoPromptGateMixin,
    DockAutoDetailLevelMixin,
    DockAutoCreditsMixin,
    DockAutoFlowStepsMixin,
    DockAutoRunLifecycleMixin,
    DockAutoRunStatusMixin,
    DockAutoReviewPanelMixin,
    DockAutoReviewCorrectMixin,
    DockStateMixin,
    QDockWidget,
):

    install_requested = pyqtSignal()
    cancel_install_requested = pyqtSignal()
    start_segmentation_requested = pyqtSignal(object)
    undo_requested = pyqtSignal()
    save_polygon_requested = pyqtSignal()
    settings_clicked = pyqtSignal()
    export_layer_requested = pyqtSignal()
    stop_segmentation_requested = pyqtSignal()
    pairing_requested = pyqtSignal(str)        # one-click connect: emits the minted pairing code
    pairing_cancel_requested = pyqtSignal(str)  # user cancelled the browser handoff (emits the code)
    # simplify, smooth, expand, fill_holes, right_angles
    # (min_area is auto-computed server-side and no longer in the UI)
    refine_settings_changed = pyqtSignal(int, int, int, bool, bool)
    # Min/Max size window in ground m2 (0 = off). Emitted right BEFORE
    # refine_settings_changed on the same debounce tick (store-only handler).
    size_filter_changed = pyqtSignal(float, float)
    # Simplify tolerance in crop pixels (0 = off) and the Points dial (the share
    # of its own points an outline keeps, 1-100). Both are outline controls the
    # Automatic review already had; they ride their own signal for the same
    # reason as clean_edges_changed, so refine_settings_changed keeps its
    # published shape. Emitted on the same debounce tick, just before it
    # (store-only handler); the `simplify` slot of refine_settings_changed is
    # legacy and no longer read.
    outline_budget_changed = pyqtSignal(float, int)
    # Fill holes SMALLER than this ground area (m2, 0 = fill every hole). Its
    # own signal so refine_settings_changed keeps its published shape; emitted
    # on the same debounce tick, just before it (store-only handler).
    fill_holes_size_changed = pyqtSignal(float)
    # Clean edges (morphological opening, px; 0 = off). Its own signal for the
    # same reason as fill_holes_size_changed: refine_settings_changed keeps its
    # published shape. Emitted on the same debounce tick, just before it
    # (store-only handler).
    clean_edges_changed = pyqtSignal(float)
    mode_changed = pyqtSignal(object)          # emits Mode value
    auto_detect_requested = pyqtSignal()       # user clicked Detect in Automatic mode
    auto_library_requested = pyqtSignal()      # user clicked Library (open prompt gallery)
    auto_demo_requested = pyqtSignal()         # first-run hero: load the demo basemap and select it (user runs flow)
    history_rerun_requested = pyqtSignal(dict)  # Recent card "Run again here" (stored run entry)
    history_reuse_prompt_requested = pyqtSignal(str)  # Recent card "Same object, new zone" (prompt token)
    zone_draw_requested = pyqtSignal()         # zone drawing should (re)start on the canvas
    auto_detail_changed = pyqtSignal(int)      # detail slider moved (value = grid side n)
    auto_prompt_committed = pyqtSignal(str)    # object class settled (debounced) -> re-seed detail
    auto_step_changed = pyqtSignal(int)        # Automatic flow switched to this step (0-2)
    auto_refine_changed = pyqtSignal()         # any auto refine control changed
    auto_review_confidence_changed = pyqtSignal(int)  # review confidence slider released (percent)
    auto_review_confidence_preview = pyqtSignal(int)   # live, while dragging (percent) - fast preview
    auto_display_mode_changed = pyqtSignal(str)        # review colours: 'normal' / 'confidence' / 'random'
    auto_show_tiles_changed = pyqtSignal(bool)  # review "Show tiles" debug checkbox toggled
    auto_export_requested = pyqtSignal()       # user clicked Export to layer in review panel
    auto_retry_requested = pyqtSignal()        # user clicked Adjust & run again in review (keep inputs)
    auto_review_exit_requested = pyqtSignal()  # user clicked Exit in review (Save/Discard dialog)
    auto_exit_requested = pyqtSignal()         # user clicked Exit on the prompt step
    auto_add_exemplar_requested = pyqtSignal(int)   # draw an example (1 = positive, 0 = exclude)
    auto_exemplar_remove_requested = pyqtSignal(str)  # user clicked x on an exemplar chip (id)
    auto_zero_assist_clicked = pyqtSignal(str, str)  # zero-result rescue chip (kind, to_prompt)
    auto_escape_pressed = pyqtSignal()         # Escape in the Automatic flow (exit / cancel draw)
    auto_enter_pressed = pyqtSignal()          # Enter in the Automatic flow (detect / export review)
    # Linear review: the ladder and the free hand edits.
    auto_correction_undo_requested = pyqtSignal()    # undo the last edit
    auto_correction_clear_requested = pyqtSignal()   # clear every edit this round
    auto_review_step_requested = pyqtSignal(int)     # navigate the review ladder (step 0-2)
    auto_correct_status_action_requested = pyqtSignal()  # status secondary action (merge confirm)
    auto_shape_edit_requested = pyqtSignal(str)      # arm a free hand edit ("merge" or "split")
    # QGIS digitizing bridge seam (plan 1 builds the entry control + banner;
    # the bridge mixin does the QGIS work). Signals live on the sip class.
    auto_edit_in_qgis_requested = pyqtSignal()       # Correct step: "Edit manually"
    auto_add_polygon_requested = pyqtSignal()        # Correct step: draw a missed polygon
    auto_qgis_bridge_done_requested = pyqtSignal()   # banner: "Done editing"
    auto_qgis_bridge_tool_requested = pyqtSignal(str)  # manual edit: vertex / reshape / split
    auto_qgis_bridge_undo_requested = pyqtSignal()   # banner: undo the last native edit
    auto_qgis_bridge_gesture_requested = pyqtSignal(str)  # banner buttons: finish / undo_point / cancel / delete_corner
    auto_qgis_bridge_points_changed = pyqtSignal(int)  # banner Points dial: thin the target before hand edits (percent)
    # Correct step, selection-first: act on the one detection picked on the map.
    auto_reshape_ai_requested = pyqtSignal()     # Refine with AI (in-place point-and-click)
    auto_reshape_done_requested = pyqtSignal()   # Done reshaping: fold back into the review
    auto_remove_requested = pyqtSignal()         # Remove the selected detection
    # AI | Manual method switch and the AI-assisted Add lane (round 3). Manual
    # Add keeps emitting auto_add_polygon_requested above; the plugin wires both.
    auto_correct_method_changed = pyqtSignal(str)  # user toggled the switch ("ai" | "manual")
    auto_ai_add_requested = pyqtSignal()           # Add lane, AI method: point at a missed object
    auto_ai_add_keep_requested = pyqtSignal()      # Add lane: keep this outline, stay armed for the next
    # Per-shape settings: the selected detection overrides the shared Shapes
    # step (simplify px, right angles). Reset drops the override.
    # The selected polygon's own shape settings, keyed by review param name.
    # A dict rather than a fixed argument list: the set grew from three dials
    # to the whole Shapes step, and a positional signal would have to be
    # re-signed on both ends every time one is added.
    auto_shape_only_changed = pyqtSignal(dict)
    auto_shape_only_reset_requested = pyqtSignal()

    # Visual exemplars ("draw one example, find all" + exclude boxes) are the
    # PRIMARY input now: a drawn example is the cloud model's biggest quality lever, so the
    # reference panel leads step 2 and a text/gallery prompt is the secondary
    # option (Detect enables on either). Note the open caveat: the cloud model's box exemplars
    # force single-image mode, which starves resolution on LARGE zones (a small
    # example shrinks below the model's useful size). Phase 1 is scoped to zones
    # small enough to stay sharp (see _refresh_reference_guard); the
    # composite-per-tile path (stamp the crop into each tile) lifts that limit.
    # That caveat is the reason the feature also answers to a server switch:
    # read live below, so it can be withdrawn without a plugin release.
    _EXEMPLARS_SHIPPED_ENABLED = True

    @property
    def _EXEMPLARS_ENABLED(self) -> bool:
        """Whether the exemplar panel is available. Read on every use so the
        server switch takes effect as soon as the configuration lands. Fails
        open to the shipped constant."""
        if not self._EXEMPLARS_SHIPPED_ENABLED:
            return False
        from ..core.server_dials import feature_enabled

        return feature_enabled("exemplars")

    def __init__(self, parent=None):
        super().__init__(tr("AI Segmentation by TerraLab"), parent)
        # A stable objectName lets QGIS persist and restore the dock's
        # open/closed state and position across sessions (same as AI Edit).
        self.setObjectName("AISegmentationDockWidget")

        self.setAllowedAreas(Qt.DockWidgetArea.LeftDockWidgetArea | Qt.DockWidgetArea.RightDockWidgetArea)
        self.setMinimumWidth(260)

        self._setup_title_bar()

        # Initialize state variables that are needed during UI setup
        self._refine_expanded = True  # Refine panel expanded by default

        # --- Pro / mode state ---
        # The dock ALWAYS opens on Automatic, for everyone,
        # every time (no persisted last-mode restore). The internal mode
        # values stay "interactive"/"automatic" (MCP API stability).
        self._mode: Mode = Mode.AUTOMATIC
        self._auto_credits: int | None = None
        self._auto_credits_total: int | None = None
        self._auto_free_left: int | None = None
        self._auto_is_subscriber: bool = False
        # Quota period end (ISO date) from the last usage fetch, plus the
        # localized day it renders as. Formatted once on arrival, never at
        # display time: a paint that raises kills QGIS at startup.
        self._auto_reset_date: str = ""
        self._auto_reset_display: str = ""
        self._auto_run_active: bool = False
        self._auto_zone_too_large: bool = False
        self._auto_zone_is_set: bool = False
        self._auto_review_active: bool = False
        # True from the instant Cancel is pressed until the run winds down: keeps
        # the "keeping what's found" note on the progress card while the worker
        # drains its in-flight tiles, instead of the send/queue line.
        self._auto_cancelling: bool = False
        # Live "waking up the AI" feedback for the pre-first-tile window: a cold
        # GPU can take up to ~a minute to answer, and with a static 0% bar that
        # reads as a hang. A 1s QTimer (created lazily) animates the bar
        # (indeterminate) and evolves the label while no tile has landed yet.
        # _auto_warming_since is the monotonic run-start used for the elapsed
        # readout; _auto_queue_position mirrors the last server queue answer
        # (0 = flowing, -1 = busy/warming with no place known, >=1 = real spot).
        self._auto_warmup_timer = None
        self._auto_warming_since: float | None = None
        self._auto_queue_position: int = 0
        self._auto_queue_eta: int = 0
        # Last per-zone credit estimate (tile count) and whether it exceeds the
        # known balance. When it does, Detect is hard-blocked: a run may never
        # launch under-funded. None = no estimate yet.
        self._auto_est_credits: int | None = None
        self._auto_insufficient_credits: bool = False
        # True while a Manual session is refining the Automatic results: the
        # manual Export-to-layer / Stop buttons are hidden so "Back to review"
        # (then Finish) stays the single, unambiguous commit path.
        self._refine_handoff: bool = False
        # Total detections seeded into a Refine-in-Manual handoff, and the kept
        # (validated) count. Both drive the compact instructions hint ("N of M
        # detections kept - click a blue detection to edit it").
        self._handoff_seed_total: int = 0
        self._handoff_kept: int = 0
        # How many detections are currently SELECTED in the handoff (selection-
        # first review): drives the "N selected" guidance card state.
        self._handoff_selected: int = 0
        # True while a detection is OPEN for editing in the handoff (the state
        # card swaps to the editing actions).
        self._handoff_editing: bool = False
        # True while the local model is still loading after a Refine click:
        # the handoff header says so and the state card stays hidden.
        self._handoff_preparing: bool = False
        # Count of positive ("find similar") visual exemplars currently set, so
        # Detect can enable on exemplars alone (no text prompt required).
        self._auto_positive_exemplars: int = 0
        # True once the user clicks "Start Automatic Segmentation": the layer
        # is locked and the flow moves to the draw-zone step. Reset to False
        # only by Exit (back to the Start step with the layer editable again).
        self._auto_started: bool = False

        self.main_widget = QWidget()
        self.main_layout = QVBoxLayout(self.main_widget)
        self.main_layout.setSpacing(8)
        self.main_layout.setContentsMargins(8, 8, 8, 8)

        self._setup_ui()

        scroll_area = QScrollArea()
        scroll_area.setWidget(self.main_widget)
        scroll_area.setWidgetResizable(True)
        scroll_area.setFrameShape(QFrame.Shape.NoFrame)
        self.setWidget(scroll_area)
        # Kept so state code can bring a below-the-fold element into view (the
        # zero-result rescue under the Detect row, the review's green primary).
        self._dock_scroll_area = scroll_area

        # Stop the mouse wheel from changing combo/spin values while the user is
        # just scrolling the panel (the "what to detect" text used to flip). One
        # guard, swept across every value widget in the panel.
        self._wheel_guard = _WheelGuard(scroll_area.viewport(), self)
        # QSlider included: hovering the confidence/detail slider while scrolling
        # the panel was silently dragging its value. With the guard, the wheel
        # only moves a slider once it is focused (clicked), else it scrolls the panel.
        for _w in self.main_widget.findChildren((QComboBox, QSpinBox, QDoubleSpinBox, QSlider)):
            _w.setFocusPolicy(Qt.FocusPolicy.StrongFocus)
            _w.installEventFilter(self._wheel_guard)

        self._dependencies_ok = False
        self._checkpoint_ok = False
        # True while the Manual install/download UI is the interactive content
        # (install needed, running, failed, or model download pending). Drives
        # the setup section's visibility from real state instead of the sticky
        # setup_group.isVisible(), which an Automatic round trip would wipe -
        # leaving the Manual page empty over a still-running background install.
        self._setup_section_wanted = False
        self._segmentation_active = False
        self._has_mask = False
        self._saved_polygon_count = 0
        self._positive_count = 0
        self._negative_count = 0
        self._plugin_activated = is_plugin_activated()
        self._activation_popup_shown = False  # Track if popup was shown
        self._segmentation_layer_id = None  # Track which layer we're segmenting
        # Note: _refine_expanded is initialized before _setup_ui() call

        # Smooth progress animation timer for long-running installs
        self._progress_timer = QTimer(self)
        self._progress_timer.timeout.connect(self._on_progress_tick)
        self._current_progress = 0
        self._target_progress = 0
        self._install_start_time = None
        self._last_percent = 0
        self._last_percent_time = None
        self._creep_counter = 0
        # Debounce timer for refinement sliders
        self._refine_debounce_timer = QTimer(self)
        self._refine_debounce_timer.setSingleShot(True)
        self._refine_debounce_timer.timeout.connect(self._emit_refine_changed)
        # Debounce timer for auto review refine controls (150 ms, same pattern).
        self._auto_review_debounce_timer = QTimer(self)
        self._auto_review_debounce_timer.setSingleShot(True)
        # Debounce timer for the review confidence slider/spinbox. The re-filter
        # re-merges every stored detection, so coalesce rapid drags/keystrokes
        # into one rebuild when the user settles instead of one per change.
        self._auto_conf_debounce_timer = QTimer(self)
        self._auto_conf_debounce_timer.setSingleShot(True)
        self._auto_conf_debounce_timer.timeout.connect(self._emit_auto_confidence_changed)
        # Live preview WHILE dragging the confidence slider: a very short debounce
        # that re-shows the filtered detections cheaply (no heavy re-merge/refine)
        # so the map tracks the handle in real time. The accurate rebuild still
        # runs on release via _auto_conf_debounce_timer.
        self._auto_conf_preview_timer = QTimer(self)
        self._auto_conf_preview_timer.setSingleShot(True)
        self._auto_conf_preview_timer.timeout.connect(self._emit_auto_confidence_preview)

        # Debounce timer for the object-class prompt: when the typed object
        # settles (~500 ms after the last keystroke) emit auto_prompt_committed
        # so the plugin can re-seed the object-aware detail default without the
        # slider jittering on every character.
        self._auto_prompt_debounce_timer = QTimer(self)
        self._auto_prompt_debounce_timer.setSingleShot(True)
        self._auto_prompt_debounce_timer.timeout.connect(self._emit_auto_prompt_committed)

        self._auto_progress_ratio = 0.0
        # Run-bar easing state (see auto_run_status.set_auto_tile_progress):
        # _target is the true count in permille and only ever rises within a run,
        # _shown is what is painted and chases it, _dirty means answers landed
        # since the last frame so Row 1 owes a rebuild.
        self._auto_progress_ease_timer = None
        self._auto_progress_target = 0
        self._auto_progress_shown = 0
        self._auto_progress_dirty = False
        # The grid this run is charged for, and which of the run's two passes
        # the bar is showing (see auto_run_status._auto_progress_phase_pair).
        self._auto_billed_tile_total = 0
        self._auto_progress_phase = "grid"

        # Debounce timer for layer visibility changes (fires per-node in groups)
        self._visibility_debounce_timer = QTimer(self)
        self._visibility_debounce_timer.setSingleShot(True)
        self._visibility_debounce_timer.timeout.connect(self._update_ui_state)

        # Connect to project layer signals for dynamic updates
        QgsProject.instance().layersAdded.connect(self._on_layers_added)
        QgsProject.instance().layersRemoved.connect(self._on_layers_removed)
        # Refresh layer dropdown when layer visibility is toggled (debounced)
        QgsProject.instance().layerTreeRoot().visibilityChanged.connect(
            self._on_layer_visibility_changed)

        # Update UI state
        self._update_full_ui()
