// Copyright (C) 2024 Rubén Beltrán del Río

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see https://map.tranquil.systems.

use serde::{Deserialize, Serialize};
use uuid::Uuid;

/// Stage labels for custom stages (matches Swift Stage struct)
#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
pub struct Stage {
    pub i: String,
    pub ii: String,
    pub iii: String,
    pub iv: String,
}

/// Custom stage definition (matches Swift CustomStage)
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct CustomStage {
    pub id: Uuid,
    pub name: String,
    pub stage: Stage,
}

impl Default for CustomStage {
    fn default() -> Self {
        Self {
            id: Uuid::new_v4(),
            name: "Custom Stage".to_string(),
            stage: Stage::default(),
        }
    }
}

impl CustomStage {
    pub fn cynefin_default() -> Self {
        Self {
            id: Uuid::new_v4(),
            name: "Cynefin".to_string(),
            stage: Stage {
                i: "Chaotic".to_string(),
                ii: "Complex".to_string(),
                iii: "Complicated".to_string(),
                iv: "Clear".to_string(),
            },
        }
    }

    pub fn placeholder_default() -> Self {
        Self {
            id: Uuid::new_v4(),
            name: "New Stage".to_string(),
            stage: Stage {
                i: "Stage I".to_string(),
                ii: "Stage II".to_string(),
                iii: "Stage III".to_string(),
                iv: "Stage IV".to_string(),
            },
        }
    }
}

/// Template for new maps (matches Swift Template)
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct Template {
    pub id: Uuid,
    pub name: String,
    pub content: String,
    #[serde(default)]
    pub is_default: bool,
}

impl Default for Template {
    fn default() -> Self {
        Self {
            id: Uuid::new_v4(),
            name: "Untitled".to_string(),
            content: String::new(),
            is_default: false,
        }
    }
}

impl Template {
    pub fn new(name: String, content: String, is_default: bool) -> Self {
        Self {
            id: Uuid::new_v4(),
            name,
            content,
            is_default,
        }
    }
}

/// JSON import/export format (matches Swift UserPreferencesJSON)
/// All fields optional to support partial imports
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
#[serde(rename_all = "camelCase")]
pub struct UserPreferencesJson {
    // Map preferences
    pub show_map_background: Option<bool>,
    pub use_custom_font: Option<bool>,
    pub custom_font_name: Option<String>,
    pub default_export_format: Option<String>,
    pub use_smart_label_positioning: Option<bool>,

    // Editor preferences
    pub use_custom_editor_font: Option<bool>,
    pub custom_editor_font_name: Option<String>,
    pub editor_font_size: Option<f64>,
    pub soft_wrap_lines: Option<bool>,

    // Templates and stages
    pub map_templates: Option<Vec<Template>>,
    pub custom_stages: Option<Vec<CustomStage>>,

    // UI preferences
    pub view_style: Option<String>,
    pub zoom: Option<f64>,
}

/// Main preferences struct stored in app
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UserPreferences {
    // Map preferences
    pub show_map_background: bool,
    pub use_custom_font: bool,
    pub custom_font_name: String,
    pub default_export_format: String,
    pub use_smart_label_positioning: bool,

    // Editor preferences
    pub use_custom_editor_font: bool,
    pub custom_editor_font_name: String,
    pub editor_font_size: f64,
    pub soft_wrap_lines: bool,

    // Templates and stages
    pub map_templates: Vec<Template>,
    pub custom_stages: Vec<CustomStage>,

    // UI preferences
    pub view_style: String,
    pub zoom: f64,
}

impl Default for UserPreferences {
    fn default() -> Self {
        Self {
            show_map_background: true,
            use_custom_font: false,
            custom_font_name: "Sans".to_string(),
            default_export_format: "png".to_string(),
            use_smart_label_positioning: true,

            use_custom_editor_font: false,
            custom_editor_font_name: "Monospace".to_string(),
            editor_font_size: 14.0,
            soft_wrap_lines: false,

            map_templates: vec![
                Template::new(
                    "Default".to_string(),
                    "title My Map\n\nanchor Business [0.95, 0.63]\nanchor Public [0.95, 0.78]\ncomponent User Needs [0.9, 0.50]\n".to_string(),
                    true,
                ),
                Template::new("Empty".to_string(), String::new(), false),
            ],
            custom_stages: vec![CustomStage::cynefin_default()],

            view_style: "horizontal".to_string(),
            zoom: 1.0,
        }
    }
}

impl UserPreferences {
    /// Convert to JSON export format
    pub fn to_json(&self) -> UserPreferencesJson {
        UserPreferencesJson {
            show_map_background: Some(self.show_map_background),
            use_custom_font: Some(self.use_custom_font),
            custom_font_name: Some(self.custom_font_name.clone()),
            default_export_format: Some(self.default_export_format.clone()),
            use_smart_label_positioning: Some(self.use_smart_label_positioning),
            use_custom_editor_font: Some(self.use_custom_editor_font),
            custom_editor_font_name: Some(self.custom_editor_font_name.clone()),
            editor_font_size: Some(self.editor_font_size),
            soft_wrap_lines: Some(self.soft_wrap_lines),
            map_templates: Some(self.map_templates.clone()),
            custom_stages: Some(self.custom_stages.clone()),
            view_style: Some(self.view_style.clone()),
            zoom: Some(self.zoom),
        }
    }

    /// Update from JSON import (partial updates supported)
    pub fn update_from_json(&mut self, json: &UserPreferencesJson) {
        if let Some(v) = json.show_map_background {
            self.show_map_background = v;
        }
        if let Some(ref v) = json.use_custom_font {
            self.use_custom_font = *v;
        }
        if let Some(ref v) = json.custom_font_name {
            self.custom_font_name = v.clone();
        }
        if let Some(ref v) = json.default_export_format {
            self.default_export_format = v.clone();
        }
        if let Some(v) = json.use_smart_label_positioning {
            self.use_smart_label_positioning = v;
        }
        if let Some(ref v) = json.use_custom_editor_font {
            self.use_custom_editor_font = *v;
        }
        if let Some(ref v) = json.custom_editor_font_name {
            self.custom_editor_font_name = v.clone();
        }
        if let Some(v) = json.editor_font_size {
            self.editor_font_size = v;
        }
        if let Some(v) = json.soft_wrap_lines {
            self.soft_wrap_lines = v;
        }
        if let Some(ref v) = json.map_templates {
            self.map_templates = v.clone();
        }
        if let Some(ref v) = json.custom_stages {
            self.custom_stages = v.clone();
        }
        if let Some(ref v) = json.view_style {
            self.view_style = v.clone();
        }
        if let Some(v) = json.zoom {
            self.zoom = v;
        }
    }

    /// Get the default template
    #[allow(dead_code)]
    pub fn default_template(&self) -> Option<&Template> {
        self.map_templates.iter().find(|t| t.is_default)
    }

    /// Set a template as default (unsets others)
    pub fn set_default_template(&mut self, id: Uuid) {
        for template in &mut self.map_templates {
            template.is_default = template.id == id;
        }
    }
}