use crate::{http_client, models::Entry};
use serde::{de::DeserializeOwned, Serialize};
use serde_json::json;
use serde_json::Value;

pub struct ContentfulManagementClient {
    management_api_access_token: String,
    space_id: String,
    base_url: String,
    environment_id: String,
}

impl ContentfulManagementClient {
    pub fn new(management_api_access_token: &str, space_id: &str) -> ContentfulManagementClient {
        let environment_id = "master".into();
        ContentfulManagementClient {
            base_url: "https://api.contentful.com/spaces".into(),
            management_api_access_token: management_api_access_token.into(),
            space_id: space_id.into(),
            environment_id,
        }
    }

    pub fn with_environment<S>(
        management_api_access_token: &str,
        space_id: &str,
        environment_id: &str,
    ) -> ContentfulManagementClient {
        ContentfulManagementClient {
            base_url: "https://api.contentful.com/spaces".into(),
            management_api_access_token: management_api_access_token.into(),
            space_id: space_id.into(),
            environment_id: environment_id.into(),
        }
    }

    fn get_entry_url(&self, entry_id: &str) -> String {
        let url = format!(
            "{base_url}/{space_id}/environments/{environment_id}/entries/{entry_id}",
            base_url = &self.base_url,
            space_id = &self.space_id,
            environment_id = &self.environment_id,
            entry_id = &entry_id
        );
        url
    }
    fn get_entries_url(&self) -> String {
        let url = format!(
            "{base_url}/{space_id}/environments/{environment_id}/entries",
            base_url = &self.base_url,
            space_id = &self.space_id,
            environment_id = &self.environment_id,
        );
        url
    }

    pub async fn get_entry(
        &self,
        entry_id: &str,
    ) -> Result<Option<Entry<Value>>, Box<dyn std::error::Error>> {
        let url = self.get_entry_url(entry_id);
        let entry =
            http_client::get::<Entry<Value>>(&url, &self.management_api_access_token).await?;
        Ok(entry)
    }

    pub async fn get_entry_for_locale<T>(
        &self,
        entry_id: &str,
        locale: &str,
    ) -> Result<Option<Entry<T>>, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned + Serialize,
    {
        let url = self.get_entry_url(entry_id);
        if let Some(entry_json) =
            http_client::get::<Entry<Value>>(&url, &self.management_api_access_token).await?
        {
            let entry_typed =
                helpers::convert_json_object_to_typed_entry(entry_json.fields.clone(), locale)?;
            let entry = Entry::new(entry_typed, entry_json.sys.clone());
            Ok(Some(entry))
        } else {
            Ok(None)
        }
    }

    pub async fn create_entry_from_json<T>(
        &self,
        entry: &Value,
        content_type_id: &str,
    ) -> Result<T, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned,
    {
        let url = self.get_entries_url();
        let mut json = http_client::post(
            &url,
            &self.management_api_access_token,
            content_type_id,
            entry,
        )
        .await?;
        let entry_created_fields = json.get_mut("fields").unwrap();
        let entry_created_string = entry_created_fields.to_string();
        let entry_created = serde_json::from_str::<T>(&entry_created_string)?;

        Ok(entry_created)
    }

    pub async fn create_entry<T>(
        &self,
        entry: &T,
        content_type_id: &str,
    ) -> Result<T, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned + Serialize,
    {
        let entry_json = json!({ "fields": entry });
        self.create_entry_from_json::<T>(&entry_json, content_type_id)
            .await
    }

    pub async fn create_entry_for_locale<T>(
        &self,
        entry: &T,
        content_type_id: &str,
        locale: &str,
    ) -> Result<T, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned + Serialize,
    {
        let entry_to_create = helpers::reconstruct_json_object_with_locale(entry, locale)?;
        let updated_entry_json = self
            .create_entry::<Value>(&entry_to_create, content_type_id)
            .await?;
        let updated_entry =
            helpers::convert_json_object_to_typed_entry(updated_entry_json, locale)?;
        Ok(updated_entry)
    }

    pub async fn create_or_update_entry_from_json(
        &self,
        entry: &Value,
        entry_id: &str,
        version: &Option<i32>,
        content_type_id: &str,
    ) -> Result<Value, Box<dyn std::error::Error>> {
        let url = self.get_entry_url(entry_id);
        let json = http_client::put(
            &url,
            &self.management_api_access_token,
            version,
            content_type_id,
            entry,
        )
        .await?;
        Ok(json)
    }

    pub async fn create_or_update_entry(
        &self,
        entry: &Entry<Value>,
        id: &str,
        content_type_id: &str,
    ) -> Result<Entry<Value>, Box<dyn std::error::Error>> {
        let entry_updated = self
            .create_or_update_entry_from_json(
                &json!(entry),
                id,
                &entry.sys.version,
                content_type_id,
            )
            .await?;
        let entry_updated_string = entry_updated.to_string();
        let entry = serde_json::from_str::<Entry<Value>>(&entry_updated_string)?;
        Ok(entry)
    }

    pub async fn create_or_update_entry_for_locale<T>(
        &self,
        entry: &Entry<T>,
        id: &str,
        locale: &str,
        content_type_id: &str,
    ) -> Result<Entry<T>, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned + Serialize,
    {
        let entry_json = helpers::reconstruct_json_object_with_locale(&entry.fields, locale)?;
        let entry_to_update = Entry::new(entry_json, entry.sys.clone());
        let updated_entry_json = self
            .create_or_update_entry(&entry_to_update, id, content_type_id)
            .await?;
        let updated_entry_typed =
            helpers::convert_json_object_to_typed_entry(json!(updated_entry_json.fields), locale)?;
        let updated_entry = Entry::new(updated_entry_typed, updated_entry_json.sys);
        Ok(updated_entry)
    }
}

mod helpers {
    use serde::{de::DeserializeOwned, Serialize};
    use serde_json::{json, Value};

    pub fn reconstruct_json_object_with_locale<T>(
        entry: &T,
        locale: &str,
    ) -> Result<Value, Box<dyn std::error::Error>>
    where
        T: Serialize,
    {
        let mut entry_json = json!(entry);
        let mut fields_map = serde_json::Map::new();

        if entry_json.is_object() {
            let entry_object = entry_json.as_object_mut().unwrap();
            for (field_name, field_value) in entry_object {
                /*if field_value.is_object() {
                    fields_map.insert(field_name.into(), field_value.clone()); //TODO
                } else if field_value.is_array() {
                    fields_map.insert(field_name.into(), field_value.clone()); //TODO
                } else {*/
                fields_map.insert(field_name.into(), json!({ locale: field_value }));
                //}
            }
        } else {
            unimplemented!();
        }

        Ok(json!(fields_map))
    }

    pub fn convert_json_object_to_typed_entry<T>(
        entry_json: Value,
        locale: &str,
    ) -> Result<T, Box<dyn std::error::Error>>
    where
        T: DeserializeOwned,
    {
        let mut entry_created_map = serde_json::Map::new();

        if entry_json.is_object() {
            let entry_object = entry_json.as_object().unwrap();
            for (field_name, field_value) in entry_object {
                if field_value.is_object() {
                    entry_created_map
                        .insert(field_name.into(), field_value.get(locale).unwrap().clone());
                } else if field_value.is_array() {
                    todo!();
                } else {
                    todo!();
                }
            }
        } else {
            todo!();
        }

        let entry_string = json!(entry_created_map).to_string();
        let created_entry = serde_json::from_str::<T>(&entry_string)?;
        Ok(created_entry)
    }
}