use eframe::egui;
use serde_json::Value;
use std::collections::HashMap;

use super::help::{show_help_window, HelpWindowOptions};
use egui_commonmark::CommonMarkCache;
use egui_phosphor::regular as icons;

/// Field types supported by the generic editor
#[derive(Clone)]
pub enum FieldType {
    Text,
    #[allow(dead_code)]
    Dropdown(Vec<(String, String)>), // (value, label)
    MultilineText,
    Checkbox,
    Date, // simple single-line date input (YYYY-MM-DD)
}

/// Definition of an editable field
#[derive(Clone)]
pub struct EditorField {
    pub name: String,
    pub label: String,
    pub field_type: FieldType,
    pub required: bool,
    pub read_only: bool,
}

/// Replacement for FormBuilder that uses egui_form + garde for validation.
/// Maintains compatibility with existing EditorField schema.
pub struct FormBuilder {
    pub title: String,
    pub fields: Vec<EditorField>,
    pub data: HashMap<String, String>, // Store as strings for form editing
    pub original_data: serde_json::Map<String, Value>, // Store original JSON data
    pub show: bool,
    pub item_id: Option<String>,
    pub is_new: bool,
    field_help: HashMap<String, String>,
    pub form_help_text: Option<String>,
    pub show_form_help: bool,
    help_cache: CommonMarkCache,
}

impl FormBuilder {
    pub fn new(title: impl Into<String>, fields: Vec<EditorField>) -> Self {
        Self {
            title: title.into(),
            fields,
            data: HashMap::new(),
            original_data: serde_json::Map::new(),
            show: false,
            item_id: None,
            is_new: false,
            field_help: HashMap::new(),
            form_help_text: None,
            show_form_help: false,
            help_cache: CommonMarkCache::default(),
        }
    }

    #[allow(dead_code)]
    pub fn with_help(mut self, help_text: impl Into<String>) -> Self {
        self.form_help_text = Some(help_text.into());
        self
    }

    pub fn open(&mut self, item: &Value) {
        self.show = true;
        self.data.clear();
        self.original_data.clear();

        // Convert JSON to string map
        if let Some(obj) = item.as_object() {
            self.original_data = obj.clone();
            for (k, v) in obj {
                let value_str = match v {
                    Value::String(s) => s.clone(),
                    Value::Number(n) => n.to_string(),
                    Value::Bool(b) => b.to_string(),
                    Value::Null => String::new(),
                    _ => serde_json::to_string(v).unwrap_or_default(),
                };
                self.data.insert(k.clone(), value_str);
            }

            self.item_id = obj.get("id").and_then(|v| match v {
                Value::String(s) => Some(s.clone()),
                Value::Number(n) => n.as_i64().map(|i| i.to_string()),
                _ => None,
            });
            self.is_new = false;
        }
    }

    pub fn open_new(&mut self, preset: Option<&serde_json::Map<String, Value>>) {
        self.show = true;
        self.data.clear();

        if let Some(p) = preset {
            for (k, v) in p {
                let value_str = match v {
                    Value::String(s) => s.clone(),
                    Value::Number(n) => n.to_string(),
                    Value::Bool(b) => b.to_string(),
                    Value::Null => String::new(),
                    _ => serde_json::to_string(v).unwrap_or_default(),
                };
                self.data.insert(k.clone(), value_str);
            }
        }

        self.item_id = None;
        self.is_new = true;
    }

    pub fn close(&mut self) {
        self.show = false;
        self.data.clear();
        self.original_data.clear();
        self.item_id = None;
        self.is_new = false;
    }

    /// Show the form editor and return Some(data) if saved, None if still open
    pub fn show_editor(
        &mut self,
        ctx: &egui::Context,
    ) -> Option<Option<serde_json::Map<String, Value>>> {
        if !self.show {
            return None;
        }

        let mut result = None;
        let mut close_requested = false;

        // Dynamic sizing
        let root_bounds = ctx.available_rect();
        let screen_bounds = ctx.input(|i| {
            i.viewport().inner_rect.unwrap_or(egui::Rect::from_min_size(
                egui::Pos2::ZERO,
                egui::vec2(800.0, 600.0),
            ))
        });
        let horizontal_margin = 24.0;
        let vertical_margin = 24.0;

        let max_w = (root_bounds.width() - horizontal_margin)
            .min(screen_bounds.width() - horizontal_margin)
            .max(260.0);
        let max_h = (root_bounds.height() - vertical_margin)
            .min(screen_bounds.height() - vertical_margin)
            .max(260.0);

        let default_w = (root_bounds.width() * 0.6).clamp(320.0, max_w);
        let default_h = (root_bounds.height() * 0.7).clamp(300.0, max_h);
        let content_max_h = (max_h - 160.0).max(180.0);
        let _window_response = egui::Window::new(&self.title)
            .collapsible(false)
            .resizable(true)
            .default_width(default_w)
            .default_height(default_h)
            .min_width(f32::min(280.0, max_w))
            .min_height(f32::min(260.0, max_h))
            .max_width(max_w)
            .max_height(max_h)
            .open(&mut self.show)
            .show(ctx, |ui| {
                egui::ScrollArea::vertical()
                    .max_height(content_max_h)
                    .show(ui, |ui| {
                        ui.vertical(|ui| {
                            for field in &self.fields.clone() {
                                let field_value = self
                                    .data
                                    .entry(field.name.clone())
                                    .or_insert_with(String::new);

                                match &field.field_type {
                                    FieldType::Text => {
                                        let label_text = if field.required {
                                            format!("{} *", field.label)
                                        } else {
                                            field.label.clone()
                                        };
                                        ui.label(&label_text);
                                        ui.add(
                                            egui::TextEdit::singleline(field_value)
                                                .desired_width(f32::INFINITY)
                                                .interactive(!field.read_only),
                                        );
                                    }
                                    FieldType::MultilineText => {
                                        let label_text = if field.required {
                                            format!("{} *", field.label)
                                        } else {
                                            field.label.clone()
                                        };
                                        ui.label(&label_text);
                                        ui.add(
                                            egui::TextEdit::multiline(field_value)
                                                .desired_width(f32::INFINITY)
                                                .interactive(!field.read_only),
                                        );
                                    }
                                    FieldType::Checkbox => {
                                        let mut checked =
                                            field_value == "true" || field_value == "1";
                                        ui.add_enabled(
                                            !field.read_only,
                                            egui::Checkbox::new(&mut checked, &field.label),
                                        );
                                        if !field.read_only {
                                            *field_value = if checked {
                                                "true".to_string()
                                            } else {
                                                "false".to_string()
                                            };
                                        }
                                    }
                                    FieldType::Date => {
                                        let label_text = if field.required {
                                            format!("{} *", field.label)
                                        } else {
                                            field.label.clone()
                                        };
                                        ui.label(&label_text);
                                        ui.add(
                                            egui::TextEdit::singleline(field_value)
                                                .hint_text("YYYY-MM-DD")
                                                .desired_width(f32::INFINITY)
                                                .interactive(!field.read_only),
                                        );
                                    }
                                    FieldType::Dropdown(options) => {
                                        let label_text = if field.required {
                                            format!("{} *", field.label)
                                        } else {
                                            field.label.clone()
                                        };
                                        ui.label(&label_text);
                                        ui.add_enabled_ui(!field.read_only, |ui| {
                                            egui::ComboBox::from_id_salt(&field.name)
                                                .width(ui.available_width())
                                                .selected_text(
                                                    options
                                                        .iter()
                                                        .find(|(v, _)| v == field_value)
                                                        .map(|(_, l)| l.as_str())
                                                        .unwrap_or(""),
                                                )
                                                .show_ui(ui, |ui| {
                                                    for (value, label) in options {
                                                        ui.selectable_value(
                                                            field_value,
                                                            value.clone(),
                                                            label,
                                                        );
                                                    }
                                                });
                                        });
                                    }
                                }

                                // Show help text if available
                                if let Some(help) = self.field_help.get(&field.name) {
                                    ui.label(
                                        egui::RichText::new(help)
                                            .small()
                                            .color(ui.visuals().weak_text_color()),
                                    );
                                }

                                ui.add_space(8.0);
                            }
                        });
                    });

                ui.separator();

                ui.horizontal(|ui| {
                    // Help button if help text is available
                    if self.form_help_text.is_some() {
                        if ui.button(format!("{} Help", icons::QUESTION)).clicked() {
                            self.show_form_help = true;
                        }
                        ui.separator();
                    }

                    // Submit button
                    if ui.button(format!("{} Save", icons::CHECK)).clicked() {
                        // Validate required fields
                        let mut missing_fields = Vec::new();
                        for field in &self.fields {
                            if field.required {
                                let value =
                                    self.data.get(&field.name).map(|s| s.as_str()).unwrap_or("");
                                if value.trim().is_empty() {
                                    missing_fields.push(field.label.clone());
                                }
                            }
                        }

                        if !missing_fields.is_empty() {
                            log::warn!("Missing required fields: {}", missing_fields.join(", "));
                            // Show error in UI - for now just log, could add error message field
                        } else {
                            // Convert string map back to JSON
                            let mut json_map = serde_json::Map::new();
                            for (k, v) in &self.data {
                                // Try to preserve types
                                let json_value = if v == "true" {
                                    Value::Bool(true)
                                } else if v == "false" {
                                    Value::Bool(false)
                                } else if let Ok(n) = v.parse::<i64>() {
                                    Value::Number(n.into())
                                } else if let Ok(n) = v.parse::<f64>() {
                                    serde_json::Number::from_f64(n)
                                        .map(Value::Number)
                                        .unwrap_or_else(|| Value::String(v.clone()))
                                } else if v.is_empty() {
                                    Value::Null
                                } else {
                                    Value::String(v.clone())
                                };
                                json_map.insert(k.clone(), json_value);
                            }

                            // CRITICAL: Include the item_id so updates work
                            if let Some(ref id) = self.item_id {
                                json_map.insert(
                                    "__editor_item_id".to_string(),
                                    Value::String(id.clone()),
                                );
                            }

                            result = Some(Some(json_map));
                            close_requested = true;
                        }
                    }

                    if ui.button(format!("{} Cancel", icons::X)).clicked() {
                        result = Some(None);
                        close_requested = true;
                    }
                });
            });
        if close_requested || !self.show {
            self.close();
        }

        // Show help window if requested
        if let Some(help_text) = &self.form_help_text {
            if self.show_form_help {
                show_help_window(
                    ctx,
                    &mut self.help_cache,
                    format!("{}_help", self.title),
                    &format!("{} - Help", self.title),
                    help_text,
                    &mut self.show_form_help,
                    HelpWindowOptions::default(),
                );
            }
        }

        result
    }
}