use crate::slides::types::{
    ElementContent, ElementStyle, Presentation, PresentationTheme, Slide, SlideBackground,
    SlideElement, ThemeColors, ThemeFonts,
};
use uuid::Uuid;

pub fn create_default_theme() -> PresentationTheme {
    PresentationTheme {
        name: "Default".to_string(),
        colors: ThemeColors {
            primary: "#1a73e8".to_string(),
            secondary: "#34a853".to_string(),
            accent: "#ea4335".to_string(),
            background: "#ffffff".to_string(),
            text: "#202124".to_string(),
            text_light: "#5f6368".to_string(),
        },
        fonts: ThemeFonts {
            heading: "Arial".to_string(),
            body: "Arial".to_string(),
        },
    }
}

pub fn create_title_slide(theme: &PresentationTheme) -> Slide {
    Slide {
        id: Uuid::new_v4().to_string(),
        layout: "title".to_string(),
        elements: vec![
            SlideElement {
                id: Uuid::new_v4().to_string(),
                element_type: "text".to_string(),
                x: 100.0,
                y: 200.0,
                width: 760.0,
                height: 100.0,
                rotation: 0.0,
                content: ElementContent {
                    text: Some("Presentation Title".to_string()),
                    html: Some("<h1>Presentation Title</h1>".to_string()),
                    src: None,
                    shape_type: None,
                    chart_data: None,
                    table_data: None,
                },
                style: ElementStyle {
                    fill: None,
                    stroke: None,
                    stroke_width: None,
                    opacity: None,
                    shadow: None,
                    font_family: Some(theme.fonts.heading.clone()),
                    font_size: Some(44.0),
                    font_weight: Some("bold".to_string()),
                    font_style: None,
                    text_align: Some("center".to_string()),
                    vertical_align: Some("middle".to_string()),
                    color: Some(theme.colors.text.clone()),
                    line_height: None,
                    border_radius: None,
                },
                animations: vec![],
                z_index: 1,
                locked: false,
            },
            SlideElement {
                id: Uuid::new_v4().to_string(),
                element_type: "text".to_string(),
                x: 100.0,
                y: 320.0,
                width: 760.0,
                height: 60.0,
                rotation: 0.0,
                content: ElementContent {
                    text: Some("Subtitle".to_string()),
                    html: Some("<p>Subtitle</p>".to_string()),
                    src: None,
                    shape_type: None,
                    chart_data: None,
                    table_data: None,
                },
                style: ElementStyle {
                    fill: None,
                    stroke: None,
                    stroke_width: None,
                    opacity: None,
                    shadow: None,
                    font_family: Some(theme.fonts.body.clone()),
                    font_size: Some(24.0),
                    font_weight: None,
                    font_style: None,
                    text_align: Some("center".to_string()),
                    vertical_align: Some("middle".to_string()),
                    color: Some(theme.colors.text_light.clone()),
                    line_height: None,
                    border_radius: None,
                },
                animations: vec![],
                z_index: 2,
                locked: false,
            },
        ],
        background: SlideBackground {
            bg_type: "solid".to_string(),
            color: Some(theme.colors.background.clone()),
            gradient: None,
            image_url: None,
            image_fit: None,
        },
        notes: None,
        transition: None,
        transition_config: None,
        media: None,
    }
}

pub fn create_content_slide(theme: &PresentationTheme) -> Slide {
    Slide {
        id: Uuid::new_v4().to_string(),
        layout: "content".to_string(),
        elements: vec![
            SlideElement {
                id: Uuid::new_v4().to_string(),
                element_type: "text".to_string(),
                x: 50.0,
                y: 40.0,
                width: 860.0,
                height: 60.0,
                rotation: 0.0,
                content: ElementContent {
                    text: Some("Slide Title".to_string()),
                    html: Some("<h2>Slide Title</h2>".to_string()),
                    src: None,
                    shape_type: None,
                    chart_data: None,
                    table_data: None,
                },
                style: ElementStyle {
                    fill: None,
                    stroke: None,
                    stroke_width: None,
                    opacity: None,
                    shadow: None,
                    font_family: Some(theme.fonts.heading.clone()),
                    font_size: Some(32.0),
                    font_weight: Some("bold".to_string()),
                    font_style: None,
                    text_align: Some("left".to_string()),
                    vertical_align: Some("middle".to_string()),
                    color: Some(theme.colors.text.clone()),
                    line_height: None,
                    border_radius: None,
                },
                animations: vec![],
                z_index: 1,
                locked: false,
            },
            SlideElement {
                id: Uuid::new_v4().to_string(),
                element_type: "text".to_string(),
                x: 50.0,
                y: 120.0,
                width: 860.0,
                height: 400.0,
                rotation: 0.0,
                content: ElementContent {
                    text: Some("Content goes here...".to_string()),
                    html: Some("<p>Content goes here...</p>".to_string()),
                    src: None,
                    shape_type: None,
                    chart_data: None,
                    table_data: None,
                },
                style: ElementStyle {
                    fill: None,
                    stroke: None,
                    stroke_width: None,
                    opacity: None,
                    shadow: None,
                    font_family: Some(theme.fonts.body.clone()),
                    font_size: Some(18.0),
                    font_weight: None,
                    font_style: None,
                    text_align: Some("left".to_string()),
                    vertical_align: Some("top".to_string()),
                    color: Some(theme.colors.text.clone()),
                    line_height: Some(1.5),
                    border_radius: None,
                },
                animations: vec![],
                z_index: 2,
                locked: false,
            },
        ],
        background: SlideBackground {
            bg_type: "solid".to_string(),
            color: Some(theme.colors.background.clone()),
            gradient: None,
            image_url: None,
            image_fit: None,
        },
        notes: None,
        transition: None,
        transition_config: None,
        media: None,
    }
}

pub fn create_blank_slide(theme: &PresentationTheme) -> Slide {
    Slide {
        id: Uuid::new_v4().to_string(),
        layout: "blank".to_string(),
        elements: vec![],
        background: SlideBackground {
            bg_type: "solid".to_string(),
            color: Some(theme.colors.background.clone()),
            gradient: None,
            image_url: None,
            image_fit: None,
        },
        notes: None,
        transition: None,
        transition_config: None,
        media: None,
    }
}

pub fn get_user_presentations_path(user_id: &str) -> String {
    format!("users/{}/presentations", user_id)
}

pub fn generate_presentation_id() -> String {
    Uuid::new_v4().to_string()
}

pub fn export_to_html(presentation: &crate::slides::types::Presentation) -> String {
    let mut html = String::from(
        r#"<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>"#,
    );
    html.push_str(&presentation.name);
    html.push_str(
        r#"</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: Arial, sans-serif; background: #000; }
        .slide {
            width: 960px;
            height: 540px;
            margin: 20px auto;
            position: relative;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        }
        .element { position: absolute; }
        .element-text { white-space: pre-wrap; }
    </style>
</head>
<body>
"#,
    );

    for slide in &presentation.slides {
        let bg_color = slide
            .background
            .color
            .as_deref()
            .unwrap_or("#ffffff");
        html.push_str(&format!(
            r#"    <div class="slide" style="background-color: {};">
"#,
            bg_color
        ));

        for element in &slide.elements {
            let style = format!(
                "left: {}px; top: {}px; width: {}px; height: {}px;",
                element.x, element.y, element.width, element.height
            );

            let content = element
                .content
                .html
                .as_deref()
                .or(element.content.text.as_deref())
                .unwrap_or("");

            html.push_str(&format!(
                r#"        <div class="element element-{}" style="{}">{}</div>
"#,
                element.element_type, style, content
            ));
        }

        html.push_str("    </div>\n");
    }

    html.push_str("</body>\n</html>");
    html
}

pub fn sanitize_filename(name: &str) -> String {
    name.chars()
        .map(|c| {
            if c.is_alphanumeric() || c == '-' || c == '_' || c == '.' {
                c
            } else if c == ' ' {
                '_'
            } else {
                '_'
            }
        })
        .collect::<String>()
        .trim_matches('_')
        .to_string()
}

pub fn export_to_svg(slide: &Slide, width: u32, height: u32) -> String {
    let mut svg = format!(
        r#"<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" width="{}" height="{}" viewBox="0 0 {} {}">
"#,
        width, height, width, height
    );

    let bg_color = slide.background.color.as_deref().unwrap_or("#ffffff");
    svg.push_str(&format!(
        r#"  <rect width="100%" height="100%" fill="{}"/>
"#,
        bg_color
    ));

    for element in &slide.elements {
        match element.element_type.as_str() {
            "text" => {
                let text = element.content.text.as_deref().unwrap_or("");
                let font_size = element.style.font_size.unwrap_or(18.0);
                let color = element.style.color.as_deref().unwrap_or("#000000");
                let font_family = element.style.font_family.as_deref().unwrap_or("Arial");
                let font_weight = element.style.font_weight.as_deref().unwrap_or("normal");

                svg.push_str(&format!(
                    r#"  <text x="{}" y="{}" font-family="{}" font-size="{}" font-weight="{}" fill="{}">{}</text>
"#,
                    element.x,
                    element.y + font_size,
                    font_family,
                    font_size,
                    font_weight,
                    color,
                    xml_escape(text)
                ));
            }
            "shape" => {
                let shape_type = element.content.shape_type.as_deref().unwrap_or("rectangle");
                let fill = element.style.fill.as_deref().unwrap_or("#cccccc");
                let stroke = element.style.stroke.as_deref().unwrap_or("none");
                let stroke_width = element.style.stroke_width.unwrap_or(1.0);

                match shape_type {
                    "rectangle" | "rect" => {
                        let rx = element.style.border_radius.unwrap_or(0.0);
                        svg.push_str(&format!(
                            r#"  <rect x="{}" y="{}" width="{}" height="{}" rx="{}" fill="{}" stroke="{}" stroke-width="{}"/>
"#,
                            element.x, element.y, element.width, element.height, rx, fill, stroke, stroke_width
                        ));
                    }
                    "circle" | "ellipse" => {
                        let cx = element.x + element.width / 2.0;
                        let cy = element.y + element.height / 2.0;
                        let rx = element.width / 2.0;
                        let ry = element.height / 2.0;
                        svg.push_str(&format!(
                            r#"  <ellipse cx="{}" cy="{}" rx="{}" ry="{}" fill="{}" stroke="{}" stroke-width="{}"/>
"#,
                            cx, cy, rx, ry, fill, stroke, stroke_width
                        ));
                    }
                    "line" => {
                        svg.push_str(&format!(
                            r#"  <line x1="{}" y1="{}" x2="{}" y2="{}" stroke="{}" stroke-width="{}"/>
"#,
                            element.x,
                            element.y,
                            element.x + element.width,
                            element.y + element.height,
                            stroke,
                            stroke_width
                        ));
                    }
                    "triangle" => {
                        let x1 = element.x + element.width / 2.0;
                        let y1 = element.y;
                        let x2 = element.x;
                        let y2 = element.y + element.height;
                        let x3 = element.x + element.width;
                        let y3 = element.y + element.height;
                        svg.push_str(&format!(
                            r#"  <polygon points="{},{} {},{} {},{}" fill="{}" stroke="{}" stroke-width="{}"/>
"#,
                            x1, y1, x2, y2, x3, y3, fill, stroke, stroke_width
                        ));
                    }
                    _ => {}
                }
            }
            "image" => {
                if let Some(ref src) = element.content.src {
                    svg.push_str(&format!(
                        r#"  <image x="{}" y="{}" width="{}" height="{}" href="{}"/>
"#,
                        element.x, element.y, element.width, element.height, src
                    ));
                }
            }
            _ => {}
        }
    }

    svg.push_str("</svg>");
    svg
}

fn xml_escape(s: &str) -> String {
    s.replace('&', "&amp;")
        .replace('<', "&lt;")
        .replace('>', "&gt;")
        .replace('"', "&quot;")
        .replace('\'', "&apos;")
}

pub fn export_slide_to_png_placeholder(slide: &Slide, width: u32, height: u32) -> Vec<u8> {
    let svg = export_to_svg(slide, width, height);
    svg.into_bytes()
}

pub fn export_to_odp_content(presentation: &Presentation) -> String {
    let mut xml = String::from(r#"<?xml version="1.0" encoding="UTF-8"?>
<office:document-content xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0"
    xmlns:draw="urn:oasis:names:tc:opendocument:xmlns:drawing:1.0"
    xmlns:presentation="urn:oasis:names:tc:opendocument:xmlns:presentation:1.0"
    xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0"
    xmlns:svg="urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0"
    office:version="1.2">
<office:body>
<office:presentation>
"#);

    for (idx, slide) in presentation.slides.iter().enumerate() {
        xml.push_str(&format!(
            "<draw:page draw:name=\"Slide{}\" draw:style-name=\"dp1\">\n",
            idx + 1
        ));

        for element in &slide.elements {
            match element.element_type.as_str() {
                "text" => {
                    let text = element.content.text.as_deref().unwrap_or("");
                    xml.push_str(&format!(
                        r#"  <draw:frame svg:x="{}pt" svg:y="{}pt" svg:width="{}pt" svg:height="{}pt">
    <draw:text-box>
      <text:p>{}</text:p>
    </draw:text-box>
  </draw:frame>
"#,
                        element.x, element.y, element.width, element.height, xml_escape(text)
                    ));
                }
                "shape" => {
                    let shape_type = element.content.shape_type.as_deref().unwrap_or("rectangle");
                    let fill = element.style.fill.as_deref().unwrap_or("#cccccc");

                    match shape_type {
                        "rectangle" | "rect" => {
                            xml.push_str(&format!(
                                r#"  <draw:rect svg:x="{}pt" svg:y="{}pt" svg:width="{}pt" svg:height="{}pt" draw:fill-color="{}"/>
"#,
                                element.x, element.y, element.width, element.height, fill
                            ));
                        }
                        "circle" | "ellipse" => {
                            xml.push_str(&format!(
                                r#"  <draw:ellipse svg:x="{}pt" svg:y="{}pt" svg:width="{}pt" svg:height="{}pt" draw:fill-color="{}"/>
"#,
                                element.x, element.y, element.width, element.height, fill
                            ));
                        }
                        _ => {}
                    }
                }
                "image" => {
                    if let Some(ref src) = element.content.src {
                        xml.push_str(&format!(
                            r#"  <draw:frame svg:x="{}pt" svg:y="{}pt" svg:width="{}pt" svg:height="{}pt">
    <draw:image xlink:href="{}"/>
  </draw:frame>
"#,
                            element.x, element.y, element.width, element.height, src
                        ));
                    }
                }
                _ => {}
            }
        }

        xml.push_str("</draw:page>\n");
    }

    xml.push_str("</office:presentation>\n</office:body>\n</office:document-content>");
    xml
}

pub fn export_to_json(presentation: &Presentation) -> String {
    serde_json::to_string_pretty(presentation).unwrap_or_default()
}

pub fn export_to_markdown(presentation: &Presentation) -> String {
    let mut md = format!("# {}\n\n", presentation.name);

    for (idx, slide) in presentation.slides.iter().enumerate() {
        md.push_str(&format!("---\n\n## Slide {}\n\n", idx + 1));

        for element in &slide.elements {
            if element.element_type == "text" {
                if let Some(ref text) = element.content.text {
                    let font_size = element.style.font_size.unwrap_or(18.0);
                    if font_size >= 32.0 {
                        md.push_str(&format!("### {}\n\n", text));
                    } else {
                        md.push_str(&format!("{}\n\n", text));
                    }
                }
            } else if element.element_type == "image" {
                if let Some(ref src) = element.content.src {
                    md.push_str(&format!("![Image]({})\n\n", src));
                }
            }
        }

        if let Some(ref notes) = slide.notes {
            md.push_str(&format!("**Speaker Notes:**\n{}\n\n", notes));
        }
    }

    md
}

pub fn slides_from_markdown(md: &str) -> Vec<Slide> {
    let theme = create_default_theme();
    let mut slides = Vec::new();
    let sections: Vec<&str> = md.split("\n---\n").collect();

    for section in sections {
        let lines: Vec<&str> = section.lines().filter(|l| !l.trim().is_empty()).collect();
        if lines.is_empty() {
            continue;
        }

        let mut slide = create_blank_slide(&theme);
        let mut y_offset = 50.0;

        for line in lines {
            let trimmed = line.trim();
            if trimmed.starts_with("# ") {
                slide.elements.push(create_text_element(
                    &trimmed[2..],
                    50.0,
                    y_offset,
                    860.0,
                    60.0,
                    44.0,
                    true,
                    &theme,
                ));
                y_offset += 80.0;
            } else if trimmed.starts_with("## ") {
                slide.elements.push(create_text_element(
                    &trimmed[3..],
                    50.0,
                    y_offset,
                    860.0,
                    50.0,
                    32.0,
                    true,
                    &theme,
                ));
                y_offset += 60.0;
            } else if trimmed.starts_with("### ") {
                slide.elements.push(create_text_element(
                    &trimmed[4..],
                    50.0,
                    y_offset,
                    860.0,
                    40.0,
                    24.0,
                    true,
                    &theme,
                ));
                y_offset += 50.0;
            } else if trimmed.starts_with("![") {
                if let Some(start) = trimmed.find('(') {
                    if let Some(end) = trimmed.find(')') {
                        let src = &trimmed[start + 1..end];
                        slide.elements.push(SlideElement {
                            id: Uuid::new_v4().to_string(),
                            element_type: "image".to_string(),
                            x: 50.0,
                            y: y_offset,
                            width: 400.0,
                            height: 300.0,
                            rotation: 0.0,
                            content: ElementContent {
                                text: None,
                                html: None,
                                src: Some(src.to_string()),
                                shape_type: None,
                                chart_data: None,
                                table_data: None,
                            },
                            style: ElementStyle::default(),
                            animations: vec![],
                            z_index: slide.elements.len() as i32,
                            locked: false,
                        });
                        y_offset += 320.0;
                    }
                }
            } else if !trimmed.is_empty() {
                slide.elements.push(create_text_element(
                    trimmed,
                    50.0,
                    y_offset,
                    860.0,
                    30.0,
                    18.0,
                    false,
                    &theme,
                ));
                y_offset += 40.0;
            }
        }

        slides.push(slide);
    }

    if slides.is_empty() {
        slides.push(create_title_slide(&theme));
    }

    slides
}

fn create_text_element(
    text: &str,
    x: f64,
    y: f64,
    width: f64,
    height: f64,
    font_size: f64,
    bold: bool,
    theme: &PresentationTheme,
) -> SlideElement {
    SlideElement {
        id: Uuid::new_v4().to_string(),
        element_type: "text".to_string(),
        x,
        y,
        width,
        height,
        rotation: 0.0,
        content: ElementContent {
            text: Some(text.to_string()),
            html: Some(format!("<p>{}</p>", text)),
            src: None,
            shape_type: None,
            chart_data: None,
            table_data: None,
        },
        style: ElementStyle {
            fill: None,
            stroke: None,
            stroke_width: None,
            opacity: None,
            shadow: None,
            font_family: Some(theme.fonts.body.clone()),
            font_size: Some(font_size),
            font_weight: if bold { Some("bold".to_string()) } else { None },
            font_style: None,
            text_align: Some("left".to_string()),
            vertical_align: Some("top".to_string()),
            color: Some(theme.colors.text.clone()),
            line_height: None,
            border_radius: None,
        },
        animations: vec![],
        z_index: 0,
        locked: false,
    }
}