use std::ops::Deref;

use ggez::{Context, GameResult};
use imgui::{CollapsingHeader, Condition, im_str, ImStr, ImString, Slider, Window, WindowFlags};
use itertools::Itertools;

use crate::scene::game_scene::GameScene;
use crate::shared_game_state::SharedGameState;

#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[repr(u8)]
pub enum ScriptType {
    Scene,
    Global,
    Inventory,
    StageSelect,
}

pub struct LiveDebugger {
    map_selector_visible: bool,
    events_visible: bool,
    hacks_visible: bool,
    flags_visible: bool,
    last_stage_id: usize,
    stages: Vec<ImString>,
    selected_stage: i32,
    events: Vec<ImString>,
    event_ids: Vec<(ScriptType, u16)>,
    selected_event: i32,
    text_windows: Vec<(u32, ImString, ImString)>,
    error: Option<ImString>,
}

impl LiveDebugger {
    pub fn new() -> Self {
        Self {
            map_selector_visible: false,
            events_visible: false,
            hacks_visible: false,
            flags_visible: false,
            last_stage_id: usize::MAX,
            stages: Vec::new(),
            selected_stage: -1,
            events: Vec::new(),
            event_ids: Vec::new(),
            selected_event: -1,
            text_windows: Vec::new(),
            error: None,
        }
    }

    pub fn run_ingame(&mut self, game_scene: &mut GameScene, state: &mut SharedGameState, ctx: &mut Context, ui: &mut imgui::Ui) -> GameResult {
        if self.last_stage_id != game_scene.stage_id {
            self.last_stage_id = game_scene.stage_id;
            self.events.clear();
            self.selected_event = -1;
        }

        Window::new(im_str!("Debugger"))
            .resizable(false)
            .collapsed(true, Condition::FirstUseEver)
            .position([5.0, 5.0], Condition::FirstUseEver)
            .size([380.0, 170.0], Condition::FirstUseEver)
            .build(ui, || {
                ui.text(format!(
                    "Player position: ({:.1},{:.1}), velocity: ({:.1},{:.1})",
                    game_scene.player1.x as f32 / 512.0,
                    game_scene.player1.y as f32 / 512.0,
                    game_scene.player1.vel_x as f32 / 512.0,
                    game_scene.player1.vel_y as f32 / 512.0,
                ));

                ui.text(format!(
                    "NPC Count: {}/{}",
                    game_scene.npc_map.npcs.values().filter(|n| n.borrow().cond.alive()).count(),
                    game_scene.npc_map.npcs.len(),
                ));

                ui.text(format!(
                    "Booster fuel: {}", game_scene.player1.booster_fuel
                ));


                ui.text(format!("Game speed ({:.1} TPS):", state.current_tps()));
                let mut speed = state.settings.speed;
                Slider::new(im_str!(""))
                    .range(0.1..=3.0)
                    .build(ui, &mut speed);
                ui.same_line(0.0);
                if ui.button(im_str!("Reset"), [0.0, 0.0]) {
                    speed = 1.0
                }

                if state.settings.speed != speed {
                    state.set_speed(speed);
                }

                if ui.button(im_str!("Map Selector"), [0.0, 0.0]) {
                    self.map_selector_visible = !self.map_selector_visible;
                }

                ui.same_line(0.0);
                if ui.button(im_str!("Events"), [0.0, 0.0]) {
                    self.events_visible = !self.events_visible;
                }

                ui.same_line(0.0);
                if ui.button(im_str!("Hacks"), [0.0, 0.0]) {
                    self.hacks_visible = !self.hacks_visible;
                }

                ui.same_line(0.0);
                if ui.button(im_str!("Flags"), [0.0, 0.0]) {
                    self.flags_visible = !self.flags_visible;
                }
            });

        if self.map_selector_visible {
            Window::new(im_str!("Map selector"))
                .resizable(false)
                .position([80.0, 80.0], Condition::Appearing)
                .size([240.0, 280.0], Condition::Appearing)
                .build(ui, || {
                    if self.stages.is_empty() {
                        for s in state.stages.iter() {
                            self.stages.push(ImString::new(s.name.to_owned()));
                        }

                        self.selected_stage = match state.stages.iter().find_position(|s| s.name == game_scene.stage.data.name) {
                            Some((pos, _)) => { pos as i32 }
                            _ => { -1 }
                        };
                    }
                    let stages: Vec<&ImStr> = self.stages.iter().map(|e| e.as_ref()).collect();

                    ui.push_item_width(-1.0);
                    ui.list_box(im_str!(""), &mut self.selected_stage, &stages, 10);

                    if ui.button(im_str!("Load"), [0.0, 0.0]) {
                        match GameScene::new(state, ctx, self.selected_stage as usize) {
                            Ok(mut scene) => {
                                scene.inventory_player1 = game_scene.inventory_player1.clone();
                                scene.player1 = game_scene.player1.clone();
                                scene.player1.x = (scene.stage.map.width / 2 * 16 * 0x200) as isize;
                                scene.player1.y = (scene.stage.map.height / 2 * 16 * 0x200) as isize;

                                if scene.player1.life == 0 {
                                    scene.player1.life = scene.player1.max_life;
                                }

                                state.next_scene = Some(Box::new(scene));
                            }
                            Err(e) => {
                                log::error!("Error loading map: {:?}", e);
                                self.error = Some(ImString::new(e.to_string()));
                            }
                        }
                    }
                });
        }

        if self.events_visible {
            Window::new(im_str!("Events"))
                .resizable(false)
                .position([80.0, 80.0], Condition::Appearing)
                .size([300.0, 300.0], Condition::Appearing)
                .build(ui, || {
                    if self.events.is_empty() {
                        self.event_ids.clear();

                        let vm = &state.textscript_vm;

                        for event in vm.scripts.scene_script.get_event_ids() {
                            self.events.push(ImString::new(format!("Scene: #{:04}", event)));
                            self.event_ids.push((ScriptType::Scene, event));
                        }

                        for event in vm.scripts.global_script.get_event_ids() {
                            self.events.push(ImString::new(format!("Global: #{:04}", event)));
                            self.event_ids.push((ScriptType::Global, event));
                        }

                        for event in vm.scripts.inventory_script.get_event_ids() {
                            self.events.push(ImString::new(format!("Inventory: #{:04}", event)));
                            self.event_ids.push((ScriptType::Inventory, event));
                        }

                        for event in vm.scripts.stage_select_script.get_event_ids() {
                            self.events.push(ImString::new(format!("Stage Select: #{:04}", event)));
                            self.event_ids.push((ScriptType::StageSelect, event));
                        }
                    }
                    let events: Vec<&ImStr> = self.events.iter().map(|e| e.as_ref()).collect();

                    ui.text_wrapped(&ImString::new(format!("Execution state: {:?}", state.textscript_vm.state)));

                    ui.push_item_width(-1.0);
                    ui.list_box(im_str!(""), &mut self.selected_event, &events, 10);

                    if ui.button(im_str!("Execute"), [0.0, 0.0]) {
                        assert_eq!(self.event_ids.len(), self.events.len());

                        if let Some((_, event_num)) = self.event_ids.get(self.selected_event as usize) {
                            state.control_flags.set_tick_world(true);
                            state.control_flags.set_interactions_disabled(true);
                            state.textscript_vm.start_script(*event_num);
                        }
                    }

                    ui.same_line(0.0);
                    if ui.button(im_str!("Decompile"), [0.0, 0.0]) {
                        if let Some((stype, event_num)) = self.event_ids.get(self.selected_event as usize) {
                            let id = ((*stype as u32) << 16) | (*event_num as u32);
                            if !self.text_windows.iter().any(|(e, _, _)| *e == id) {
                                let script = match stype {
                                    ScriptType::Scene => &state.textscript_vm.scripts.scene_script,
                                    ScriptType::Global => &state.textscript_vm.scripts.global_script,
                                    ScriptType::Inventory => &state.textscript_vm.scripts.inventory_script,
                                    ScriptType::StageSelect => &state.textscript_vm.scripts.stage_select_script,
                                };

                                match script.decompile_event(*event_num) {
                                    Ok(code) => {
                                        self.text_windows.push((
                                            id,
                                            ImString::new(format!("Decompiled event: #{:04}", *event_num)),
                                            ImString::new(code)
                                        ));
                                    }
                                    Err(e) => {
                                        self.error = Some(ImString::new(format!("Error decompiling TextScript #{:04}: {}", *event_num, e)));
                                    }
                                }
                            }
                        }
                    }
                });
        }

        if self.flags_visible {
            Window::new(im_str!("Flags"))
                .position([80.0, 80.0], Condition::FirstUseEver)
                .size([280.0, 300.0], Condition::FirstUseEver)
                .build(ui, || {
                    if CollapsingHeader::new(im_str!("Control flags")).default_open(false).build(&ui) {
                        ui.checkbox_flags(im_str!("Tick world"), &mut state.control_flags.0, 1);
                        ui.checkbox_flags(im_str!("Control enabled"), &mut state.control_flags.0, 2);
                        ui.checkbox_flags(im_str!("Interactions disabled"), &mut state.control_flags.0, 4);
                        ui.checkbox_flags(im_str!("Credits running"), &mut state.control_flags.0, 8);
                        ui.separator();
                        ui.checkbox_flags(im_str!("[Internal] Windy level"), &mut state.control_flags.0, 15);
                    }

                    if CollapsingHeader::new(im_str!("Player condition flags")).default_open(false).build(&ui) {
                        cond_flags(&ui, &mut game_scene.player1.cond);
                    }

                    if CollapsingHeader::new(im_str!("Player equipment")).default_open(false).build(&ui) {
                        ui.checkbox_flags(im_str!("Booster 0.8"), &mut game_scene.player1.equip.0, 1);
                        ui.checkbox_flags(im_str!("Map System"), &mut game_scene.player1.equip.0, 2);
                        ui.checkbox_flags(im_str!("Arms Barrier"), &mut game_scene.player1.equip.0, 4);
                        ui.checkbox_flags(im_str!("Turbocharge"), &mut game_scene.player1.equip.0, 8);
                        ui.checkbox_flags(im_str!("Air Tank"), &mut game_scene.player1.equip.0, 16);
                        ui.checkbox_flags(im_str!("Booster 2.0"), &mut game_scene.player1.equip.0, 32);
                        ui.checkbox_flags(im_str!("Mimiga Mask"), &mut game_scene.player1.equip.0, 64);
                        ui.checkbox_flags(im_str!("Whimsical Star"), &mut game_scene.player1.equip.0, 128);
                        ui.checkbox_flags(im_str!("Nikumaru Counter"), &mut game_scene.player1.equip.0, 256);
                    }
                });
        }

        let mut remove = -1;
        for (idx, (_, title, contents)) in self.text_windows.iter().enumerate() {
            let mut opened = true;

            Window::new(title)
                .position([100.0, 100.0], Condition::FirstUseEver)
                .size([400.0, 300.0], Condition::FirstUseEver)
                .opened(&mut opened)
                .build(ui, || {
                    ui.text_wrapped(contents);
                });

            if !opened {
                remove = idx as i32;
            }
        }

        if remove >= 0 {
            self.text_windows.remove(remove as usize);
        }

        if self.error.is_some() {
            Window::new(im_str!("Error!"))
                .resizable(false)
                .collapsible(false)
                .position([((state.screen_size.0 - 300.0) / 2.0).floor(), ((state.screen_size.1 - 100.0) / 2.0).floor()], Condition::Appearing)
                .size([300.0, 100.0], Condition::Appearing)
                .build(ui, || {
                    ui.push_item_width(-1.0);
                    ui.text_wrapped(self.error.as_ref().unwrap());

                    if ui.button(im_str!("OK"), [0.0, 0.0]) {
                        self.error = None;
                    }
                });
        }

        Ok(())
    }
}

fn cond_flags(ui: &imgui::Ui, cond: &mut crate::common::Condition) {
    ui.checkbox_flags(im_str!("Interacted"), &mut cond.0, 1);
    ui.checkbox_flags(im_str!("Hidden"), &mut cond.0, 2);
    ui.checkbox_flags(im_str!("Fallen"), &mut cond.0, 4);
    ui.checkbox_flags(im_str!("Built-in NPC destroy handler"), &mut cond.0, 8);
    ui.checkbox_flags(im_str!("Damage first boss NPC"), &mut cond.0, 16);
    ui.checkbox_flags(im_str!("Increased acceleration"), &mut cond.0, 32);
    ui.checkbox_flags(im_str!("Unknown (0x40)"), &mut cond.0, 64);
    ui.checkbox_flags(im_str!("Alive"), &mut cond.0, 128);
}