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use crate::error::Error;
use egml_core::{MultiSurface, Polygon};
use quick_xml::de;

use crate::geometry::polygon::GmlPolygon;
use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename = "gml:MultiSurface")]
struct GmlMultiSurface {
    #[serde(rename = "@id", default)]
    id: String,
    #[serde(rename = "$value")]
    members: Vec<GmlSurfaceMember>,
}

#[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename = "gml:surfaceMember")]
pub struct GmlSurfaceMember {
    #[serde(rename = "$value")]
    pub polygon: Option<GmlPolygon>,
}

impl GmlMultiSurface {
    pub fn to_multi_surface(self) -> Result<MultiSurface, Error> {
        let polygons: Vec<Polygon> = self
            .members
            .into_iter()
            .flat_map(|x| x.polygon)
            .map(|x| x.to_polygon())
            .collect::<Result<Vec<_>, _>>()?;

        let multi_surface = MultiSurface::new(polygons)?;
        Ok(multi_surface)
    }
}

pub fn parse_multi_surface(source_text: &str) -> Result<MultiSurface, Error> {
    let parsed_geometry: GmlMultiSurface = de::from_str(source_text)?;
    let multi_surface = parsed_geometry.to_multi_surface()?;
    Ok(multi_surface)
}

#[cfg(test)]
mod tests {
    use crate::parse_multi_surface;

    #[test]
    fn parsing_multi_surface() {
        let source_text = "<gml:MultiSurface gml:id=\"UUID_6b33ecfa-6e08-4e8e-a4b5-e1d06540faf0\">
              <gml:surfaceMember>
                <gml:Polygon gml:id=\"UUID_efb8f6a5-82fa-4b21-8709-c1d93ed1e595\">
                  <gml:exterior>
                    <gml:LinearRing>
                      <gml:posList srsDimension=\"3\">678009.7116291433 5403638.313338383 417.3480034550211 678012.5609078613 5403634.960884141 417.34658523466385 678013.7892528991 5403636.004867206 417.51938733855997 678010.9399743223 5403639.357321232 417.5208051908512 678009.7116291433 5403638.313338383 417.3480034550211</gml:posList>
                    </gml:LinearRing>
                  </gml:exterior>
                </gml:Polygon>
              </gml:surfaceMember>
            </gml:MultiSurface>";

        let _result = parse_multi_surface(source_text).unwrap();
    }

    #[test]
    fn parsing_multi_surface_with_duplicate_elements() {
        let source_text = "<gml:MultiSurface srsName=\"EPSG:25832\" srsDimension=\"3\">
              <gml:surfaceMember>
                <gml:Polygon gml:id=\"4018133_PG.3nRTCd4XPu47PsAAUyNv\">
                  <gml:exterior>
                    <gml:LinearRing gml:id=\"4018133_LR.lHfcvQUrKVl08ifcH6eO\">
                      <gml:posList>678105.792 5403815.554 369.98523 678105.792 5403815.555 367.67323 678106.047 5403815.125 367.67323 678106.047 5403815.125 367.67323 678106.047 5403815.125 367.67323 678106.047 5403815.124 369.98523 678105.792 5403815.554 369.98523</gml:posList>
                    </gml:LinearRing>
                  </gml:exterior>
                </gml:Polygon>
              </gml:surfaceMember>
            </gml:MultiSurface>";

        let _result = parse_multi_surface(source_text).unwrap();
    }

    #[test]
    fn parsing_multi_surface_with_holes() {
        let source_text = "
            <gml:MultiSurface srsName=\"EPSG:25832\" srsDimension=\"3\">
              <gml:surfaceMember>
                <gml:Polygon gml:id=\"4018106_PG.dKY9ug9ol2tsxL5bLAPz\">
                  <gml:exterior>
                    <gml:LinearRing gml:id=\"4018106_LR.Wqmtl1E6Yz3eVJkuGjsK\">
                      <gml:posList>678097.805 5403801.433 367.40123 678092.938 5403810.139 367.40123 678092.938 5403810.139 370.87623 678092.032 5403811.76 370.87623 678092.032 5403811.76 377.09023 678097.805 5403801.433 377.09023 678097.805 5403801.433 367.40123</gml:posList>
                    </gml:LinearRing>
                  </gml:exterior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.10JNDsQqif3fouy54mfv\">
                      <gml:posList>678096.88 5403803.088 374.90623 678097.403 5403802.152 374.90623 678097.403 5403802.152 376.19923 678096.88 5403803.088 376.19923 678096.88 5403803.088 374.90623</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.yzLlZkAQX00eXb6Xi0DZ\">
                      <gml:posList>678096.154 5403804.386 376.19923 678096.154 5403804.386 374.90623 678096.677 5403803.45 374.90623 678096.677 5403803.45 376.19923 678096.154 5403804.386 376.19923</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.MIkI0SEPyMQ4yblCNiF2\">
                      <gml:posList>678095.438 5403805.667 376.19923 678095.438 5403805.667 374.90623 678095.961 5403804.731 374.90623 678095.961 5403804.731 376.19923 678095.438 5403805.667 376.19923</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.novU6ZVfhrtxrFFh7eYQ\">
                      <gml:posList>678097.403 5403802.152 372.05223 678097.403 5403802.152 373.34523 678096.88 5403803.088 373.34523 678096.88 5403803.088 372.05223 678097.403 5403802.152 372.05223</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.XdJcfjsruS75wlUmTQdH\">
                      <gml:posList>678096.677 5403803.45 372.05223 678096.677 5403803.45 373.34523 678096.154 5403804.386 373.34523 678096.154 5403804.386 372.05223 678096.677 5403803.45 372.05223</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.wzwxsPr4Ys8dTM1bzH8T\">
                      <gml:posList>678095.961 5403804.731 372.05223 678095.961 5403804.731 373.34523 678095.438 5403805.667 373.34523 678095.438 5403805.667 372.05223 678095.961 5403804.731 372.05223</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.20P6FwXiq4ZJ4EAxdmJ0\">
                      <gml:posList>678093.838 5403808.528 374.89423 678094.361 5403807.593 374.89423 678094.361 5403807.593 376.18723 678093.838 5403808.528 376.18723 678093.838 5403808.528 374.89423</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.saIYdVUNcoK3LJkC2LDw\">
                      <gml:posList>678093.645 5403808.873 374.89423 678093.645 5403808.873 376.18723 678093.122 5403809.809 376.18723 678093.122 5403809.809 374.89423 678093.645 5403808.873 374.89423</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.yPDE98qtqfTYBziBsTpl\">
                      <gml:posList>678093.869 5403808.474 372.04523 678094.392 5403807.538 372.04523 678094.392 5403807.538 373.33823 678093.869 5403808.474 373.33823 678093.869 5403808.474 372.04523</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.XaQt7QEqeVnG2PB8D6ad\">
                      <gml:posList>678093.153 5403809.755 373.33823 678093.153 5403809.755 372.04523 678093.676 5403808.819 372.04523 678093.676 5403808.819 373.33823 678093.153 5403809.755 373.33823</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.kCEyyLA2tigxjpQY9cyU\">
                      <gml:posList>678092.933 5403810.148 372.04523 678092.933 5403810.148 373.32523 678092.126 5403811.591 373.32523 678092.126 5403811.591 372.04523 678092.933 5403810.148 372.04523</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.Wq5AG6YS8zrN5HgtFQD8\">
                      <gml:posList>678092.126 5403811.591 376.18723 678092.126 5403811.591 374.89423 678092.933 5403810.148 374.89423 678092.933 5403810.148 376.18723 678092.126 5403811.591 376.18723</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.aQFMEYkDQkns0ZoJ66pj\">
                      <gml:posList>678095.264 5403805.978 370.34223000000003 678095.264 5403805.978 370.79823 678093.197 5403809.675 370.79823 678093.197 5403809.675 370.34223000000003 678095.264 5403805.978 370.34223000000003</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.tXljCrPP3Efr0mz83aTx\">
                      <gml:posList>678095.254 5403805.996 368.30523 678095.254 5403805.996 370.06923 678093.187 5403809.693 370.06923 678093.187 5403809.693 368.30523 678095.254 5403805.996 368.30523</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.gLnR6siy7dPwvvNX2zz0\">
                      <gml:posList>678095.558 5403805.452 370.06723 678095.558 5403805.452 368.30323 678097.625 5403801.755 368.30323 678097.625 5403801.755 370.06723 678095.558 5403805.452 370.06723</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                  <gml:interior>
                    <gml:LinearRing gml:id=\"4018106_LR.Iw6I84mlFFHQEPQCpApK\">
                      <gml:posList>678097.625 5403801.755 370.34223000000003 678097.625 5403801.755 370.79223 678095.558 5403805.452 370.79223 678095.558 5403805.452 370.34223000000003 678097.625 5403801.755 370.34223000000003</gml:posList>
                    </gml:LinearRing>
                  </gml:interior>
                </gml:Polygon>
              </gml:surfaceMember>
            </gml:MultiSurface>";

        let result = parse_multi_surface(source_text).unwrap();

        assert_eq!(result.members().len(), 1);
    }

    #[test]
    fn parsing_multi_surface_without_id() {
        let source_text = "<gml:MultiSurface>
              <gml:surfaceMember>
                <gml:Polygon>
                  <gml:exterior>
                    <gml:LinearRing>
                      <gml:posList srsDimension=\"3\">678009.7116291433 5403638.313338383 417.3480034550211 678012.5609078613 5403634.960884141 417.34658523466385 678013.7892528991 5403636.004867206 417.51938733855997 678010.9399743223 5403639.357321232 417.5208051908512 678009.7116291433 5403638.313338383 417.3480034550211</gml:posList>
                    </gml:LinearRing>
                  </gml:exterior>
                </gml:Polygon>
              </gml:surfaceMember>
            </gml:MultiSurface>";

        let _result = parse_multi_surface(source_text).unwrap();
    }
}