# core/input_handler.py
"""Handles all input events and camera controls."""

import pygame
from config.constants import *


class InputHandler:
    def __init__(self, camera, world):
        self.camera = camera
        self.world = world

        # Selection state
        self.selecting = False
        self.select_start = None
        self.select_end = None
        self.selected_objects = []

        # UI state flags
        self.show_grid = True
        self.show_interaction_radius = False
        self.show_legend = False
        self.is_paused = False

        # Speed control
        self.tps = DEFAULT_TPS
        self.default_tps = DEFAULT_TPS
        self.sprint_mode = False

    def handle_events(self, events, ui_manager):
        """Process all pygame events and return game state."""
        running = True

        for event in events:
            ui_manager.process_events(event)

            if event.type == pygame.QUIT:
                running = False
            elif event.type == pygame.KEYDOWN:
                running = self._handle_keydown(event, running)
            elif event.type == pygame.KEYUP:
                self._handle_keyup(event)
            elif event.type == pygame.MOUSEWHEEL:
                self.camera.handle_zoom(event.y)
            elif event.type == pygame.MOUSEBUTTONDOWN:
                self._handle_mouse_down(event)
            elif event.type == pygame.MOUSEBUTTONUP:
                self._handle_mouse_up(event)
            elif event.type == pygame.MOUSEMOTION:
                self._handle_mouse_motion(event)

        return running

    def _handle_keydown(self, event, running):
        """Handle keydown events."""
        if event.key == pygame.K_ESCAPE:
            if len(self.selected_objects) == 0:
                running = False
            else:
                self.selecting = False
                self.selected_objects = []
        elif event.key == pygame.K_g:
            self.show_grid = not self.show_grid
        elif event.key == pygame.K_UP:
            if self.camera.speed < MAX_CAMERA_SPEED:
                self.camera.speed += CAMERA_SPEED_INCREMENT
        elif event.key == pygame.K_DOWN:
            if self.camera.speed > MIN_CAMERA_SPEED:
                self.camera.speed -= CAMERA_SPEED_INCREMENT
        elif event.key == pygame.K_i:
            self.show_interaction_radius = not self.show_interaction_radius
        elif event.key == pygame.K_l:
            self.show_legend = not self.show_legend
        elif event.key == pygame.K_SPACE:
            self.is_paused = not self.is_paused
        elif event.key == pygame.K_LSHIFT:
            self.tps = self.default_tps * TURBO_MULTIPLIER
        elif event.key == pygame.K_r:
            self.camera.reset_position()
        elif event.key == pygame.K_RSHIFT:
            self.sprint_mode = not self.sprint_mode  # Enter sprint mode

        return running

    def _handle_keyup(self, event):
        """Handle keyup events."""
        if event.key == pygame.K_LSHIFT:
            self.tps = self.default_tps
        # if event.key == pygame.K_RSHIFT:
        #     self.sprint_mode = False  # Exit sprint mode

    def _handle_mouse_down(self, event):
        """Handle mouse button down events."""
        if event.button == 2:  # Middle mouse button
            self.camera.start_panning(event.pos)
        elif event.button == 1:  # Left mouse button
            self.selecting = True
            self.select_start = event.pos
            self.select_end = event.pos

    def _handle_mouse_up(self, event):
        """Handle mouse button up events."""
        if event.button == 2:
            self.camera.stop_panning()
        elif event.button == 1 and self.selecting:
            self._handle_selection()

    def _handle_mouse_motion(self, event):
        """Handle mouse motion events."""
        self.camera.pan(event.pos)
        if self.selecting:
            self.select_end = event.pos

    def _handle_selection(self):
        """Process object selection logic."""
        self.selecting = False

        # Convert screen to world coordinates
        x1, y1 = self.camera.get_real_coordinates(*self.select_start)
        x2, y2 = self.camera.get_real_coordinates(*self.select_end)

        # Check if selection is a click or drag
        if (abs(self.select_start[0] - self.select_end[0]) < SELECTION_THRESHOLD and
                abs(self.select_start[1] - self.select_end[1]) < SELECTION_THRESHOLD):
            self._handle_click_selection()
        else:
            self._handle_drag_selection(x1, y1, x2, y2)

    def _handle_click_selection(self):
        """Handle single click selection."""
        mouse_world_x, mouse_world_y = self.camera.get_real_coordinates(*self.select_start)
        obj = self.world.query_closest_object(mouse_world_x, mouse_world_y)
        self.selected_objects = []

        if obj:
            obj_x, obj_y = obj.position.get_position()
            dx = obj_x - mouse_world_x
            dy = obj_y - mouse_world_y
            dist = (dx ** 2 + dy ** 2) ** 0.5
            if dist <= obj.max_visual_width / 2:
                self.selected_objects = [obj]

        print(f"Clicked: selected {len(self.selected_objects)} object(s)")

    def _handle_drag_selection(self, x1, y1, x2, y2):
        """Handle drag selection."""
        min_x, max_x = min(x1, x2), max(x1, x2)
        min_y, max_y = min(y1, y2), max(y1, y2)
        self.selected_objects = self.world.query_objects_in_range(min_x, min_y, max_x, max_y)
        print(f"Selected {len(self.selected_objects)} objects in range: {min_x}, {min_y} to {max_x}, {max_y}")

    def update_camera(self, keys, deltatime):
        """Update camera based on currently pressed keys."""
        self.camera.update(keys, deltatime)

    def update_selected_objects(self):
        """Ensure selected objects are still valid."""
        self.selected_objects = [
            obj for obj in self.selected_objects if obj in self.world.get_objects()
        ]

    def get_selection_rect(self):
        """Get current selection rectangle for rendering."""
        if self.selecting and self.select_start and self.select_end:
            left = min(self.select_start[0], self.select_end[0])
            top = min(self.select_start[1], self.select_end[1])
            width = abs(self.select_end[0] - self.select_start[0])
            height = abs(self.select_end[1] - self.select_start[1])
            return (left, top, width, height)
        return None