//! Assets API - Manage photos and videos

use std::io::Cursor;
use std::path::Path;

use crate::{
    Client,
    error::{ImmichError, Result},
    models::{
        AssetId, AssetMediaSize, AssetResponse, AssetUploadResponse, DeleteAssetsRequest,
        MetadataSearchRequest, SearchResponse,
    },
};

/// Response from downloading a thumbnail containing image data and metadata
#[derive(Debug, Clone)]
pub struct ThumbnailResponse {
    /// The image data as bytes
    pub data: bytes::Bytes,
    /// The MIME type of the image (e.g., "image/jpeg", "image/png", "image/webp")
    pub content_type: String,
}

impl ThumbnailResponse {
    /// Get the file extension based on content type
    pub fn extension(&self) -> Option<&str> {
        match self.content_type.as_str() {
            "image/jpeg" | "image/jpg" => Some("jpg"),
            "image/png" => Some("png"),
            "image/webp" => Some("webp"),
            "image/gif" => Some("gif"),
            "image/tiff" => Some("tiff"),
            _ => None,
        }
    }

    /// Get the content type
    pub fn content_type(&self) -> &str {
        &self.content_type
    }

    /// Get the data
    pub fn data(&self) -> &bytes::Bytes {
        &self.data
    }

    /// Convert to owned bytes
    pub fn into_data(self) -> bytes::Bytes {
        self.data
    }

    /// Decode the image data into a DynamicImage
    ///
    /// # Errors
    /// Returns an error if the content type is not supported or if decoding fails
    ///
    /// # Example
    /// ```rust,ignore
    /// use immich_sdk::Client;
    ///
    /// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
    /// let client = Client::from_url("https://immich.example.com")?;
    /// let asset_id = "your-asset-id".parse()?;
    /// let response = client.assets().thumbnail(asset_id).execute().await?;
    /// let image = response.decode()?;
    /// println!("Image size: {}x{}", image.width(), image.height());
    /// # Ok(())
    /// # }
    /// ```
    pub fn decode(&self) -> Result<image::DynamicImage> {
        // Get image format from content type
        let format = image::ImageFormat::from_mime_type(&self.content_type).ok_or_else(|| {
            ImmichError::Image(format!("Unsupported content type: {}", self.content_type))
        })?;

        // Create reader with the format and decode
        image::ImageReader::with_format(Cursor::new(&self.data), format)
            .decode()
            .map_err(|e| ImmichError::Image(e.to_string()))
    }
}

/// API for managing assets (photos and videos)
#[derive(Debug, Clone)]
pub struct AssetsApi {
    client: Client,
}

impl AssetsApi {
    /// Create a new assets API instance
    pub const fn new(client: Client) -> Self {
        Self { client }
    }

    /// List assets with optional filters
    pub fn list(&self) -> ListAssetsBuilder {
        ListAssetsBuilder::new(self.client.clone())
    }

    /// Get a single asset by ID
    pub fn get(&self, id: AssetId) -> GetAssetBuilder {
        GetAssetBuilder::new(self.client.clone(), id)
    }

    /// Upload a new asset
    pub fn upload(&self) -> UploadAssetBuilder {
        UploadAssetBuilder::new(self.client.clone())
    }

    /// Delete assets
    pub fn delete(&self) -> DeleteAssetsBuilder {
        DeleteAssetsBuilder::new(self.client.clone())
    }

    /// Download an asset
    pub fn download(&self, id: AssetId) -> DownloadAssetBuilder {
        DownloadAssetBuilder::new(self.client.clone(), id)
    }

    /// Get asset thumbnail
    pub fn thumbnail(&self, id: AssetId) -> ThumbnailBuilder {
        ThumbnailBuilder::new(self.client.clone(), id)
    }
}

/// Builder for listing assets
#[derive(Debug)]
pub struct ListAssetsBuilder {
    client: Client,
    album_id: Option<AssetId>,
    is_favorite: Option<bool>,
    is_trashed: Option<bool>,
}

impl ListAssetsBuilder {
    /// Create a new list builder
    const fn new(client: Client) -> Self {
        Self {
            client,
            album_id: None,
            is_favorite: None,
            is_trashed: None,
        }
    }

    /// Filter by album ID
    pub fn with_album_id(mut self, album_id: AssetId) -> Self {
        self.album_id = Some(album_id);
        self
    }

    /// Filter by favorite status
    pub fn is_favorite(mut self, favorite: bool) -> Self {
        self.is_favorite = Some(favorite);
        self
    }

    /// Filter by trash status
    pub fn is_trashed(mut self, trashed: bool) -> Self {
        self.is_trashed = Some(trashed);
        self
    }

    /// Execute the request
    pub async fn execute(self) -> Result<Vec<AssetResponse>> {
        let req = self.client.post("/search/metadata");

        let mut body = MetadataSearchRequest::default();

        if let Some(album_id) = self.album_id {
            body.album_ids = Some(vec![album_id]);
        }

        if let Some(is_favorite) = self.is_favorite {
            body.is_favorite = Some(is_favorite);
        }

        if let Some(is_trashed) = self.is_trashed {
            body.with_deleted = Some(is_trashed);
        }

        let response = self.client.execute(req.json(&body).build()?).await?;
        let search_result: SearchResponse = response.json().await?;

        Ok(search_result.assets.items)
    }
}

/// Builder for getting a single asset
#[derive(Debug)]
pub struct GetAssetBuilder {
    client: Client,
    id: AssetId,
}

impl GetAssetBuilder {
    /// Create a new get builder
    const fn new(client: Client, id: AssetId) -> Self {
        Self { client, id }
    }

    /// Execute the request
    pub async fn execute(self) -> Result<AssetResponse> {
        let path = format!("/assets/{}", self.id);
        let req = self.client.get(&path);
        let response = self.client.execute(req.build()?).await?;
        let asset: AssetResponse = response.json().await?;

        Ok(asset)
    }
}

/// Builder for uploading an asset
#[derive(Debug)]
pub struct UploadAssetBuilder {
    client: Client,
    file_path: Option<String>,
    device_asset_id: Option<String>,
    device_id: Option<String>,
    is_favorite: bool,
    file_created_at: Option<String>,
    file_modified_at: Option<String>,
}

impl UploadAssetBuilder {
    /// Create a new upload builder
    const fn new(client: Client) -> Self {
        Self {
            client,
            file_path: None,
            device_asset_id: None,
            device_id: None,
            is_favorite: false,
            file_created_at: None,
            file_modified_at: None,
        }
    }

    /// Set the file path to upload
    pub fn file(mut self, path: impl AsRef<Path>) -> Self {
        self.file_path = Some(path.as_ref().to_string_lossy().to_string());
        self
    }

    /// Set the device asset ID (required)
    pub fn device_asset_id(mut self, id: impl Into<String>) -> Self {
        self.device_asset_id = Some(id.into());
        self
    }

    /// Set the device ID (required)
    pub fn device_id(mut self, id: impl Into<String>) -> Self {
        self.device_id = Some(id.into());
        self
    }

    /// Mark as favorite
    pub fn favorite(mut self) -> Self {
        self.is_favorite = true;
        self
    }

    /// Set file creation timestamp (ISO 8601 format)
    pub fn file_created_at(mut self, timestamp: impl Into<String>) -> Self {
        self.file_created_at = Some(timestamp.into());
        self
    }

    /// Set file modification timestamp (ISO 8601 format)
    pub fn file_modified_at(mut self, timestamp: impl Into<String>) -> Self {
        self.file_modified_at = Some(timestamp.into());
        self
    }

    /// Execute the upload
    pub async fn execute(self) -> Result<AssetUploadResponse> {
        let file_path = self
            .file_path
            .ok_or_else(|| ImmichError::Validation("File path is required".to_string()))?;

        // Read file
        let file_content = tokio::fs::read(&file_path).await?;
        let file_name = std::path::Path::new(&file_path)
            .file_name()
            .ok_or_else(|| ImmichError::Validation("Invalid file path".to_string()))?
            .to_string_lossy();

        // Build multipart form
        let mut form = reqwest::multipart::Form::new().part(
            "assetData",
            reqwest::multipart::Part::bytes(file_content).file_name(file_name.to_string()),
        );

        if let Some(device_asset_id) = self.device_asset_id {
            form = form.text("deviceAssetId", device_asset_id);
        }

        if let Some(device_id) = self.device_id {
            form = form.text("deviceId", device_id);
        }

        form = form.text("isFavorite", self.is_favorite.to_string());

        // Add file timestamps (required by Immich API v2)
        let now = chrono::Utc::now().to_rfc3339();
        form = form.text("fileCreatedAt", self.file_created_at.unwrap_or_else(|| now.clone()));
        form = form.text("fileModifiedAt", self.file_modified_at.unwrap_or(now));

        let req = self.client.post("/assets").multipart(form);
        let response = self.client.execute(req.build()?).await?;
        let result: AssetUploadResponse = response.json().await?;

        Ok(result)
    }
}

/// Builder for deleting assets
#[derive(Debug)]
pub struct DeleteAssetsBuilder {
    client: Client,
    ids: Vec<AssetId>,
}

impl DeleteAssetsBuilder {
    /// Create a new delete builder
    const fn new(client: Client) -> Self {
        Self {
            client,
            ids: Vec::new(),
        }
    }

    /// Add an asset ID to delete
    pub fn id(mut self, id: AssetId) -> Self {
        self.ids.push(id);
        self
    }

    /// Add multiple asset IDs to delete
    pub fn ids(mut self, ids: impl IntoIterator<Item = AssetId>) -> Self {
        self.ids.extend(ids);
        self
    }

    /// Execute the deletion
    pub async fn execute(self) -> Result<()> {
        if self.ids.is_empty() {
            return Err(ImmichError::Validation(
                "At least one asset ID is required".to_string(),
            ));
        }

        let body = DeleteAssetsRequest {
            ids: self.ids,
            force: false,
        };
        let req = self.client.delete("/assets").json(&body);
        let _response = self.client.execute(req.build()?).await?;

        Ok(())
    }
}

/// Builder for downloading an asset
#[derive(Debug)]
pub struct DownloadAssetBuilder {
    client: Client,
    id: AssetId,
    edited: bool,
}

impl DownloadAssetBuilder {
    /// Create a new download builder
    const fn new(client: Client, id: AssetId) -> Self {
        Self {
            client,
            id,
            edited: false,
        }
    }

    /// Download the edited version if available
    pub fn edited(mut self) -> Self {
        self.edited = true;
        self
    }

    /// Execute the download
    pub async fn execute(self) -> Result<bytes::Bytes> {
        let path = format!("/assets/{}/original", self.id);
        let mut req = self.client.get(&path);

        if self.edited {
            req = req.query(&[("edited", "true")]);
        }

        let response = self.client.execute(req.build()?).await?;
        let bytes = response.bytes().await?;
        Ok(bytes)
    }
}

/// Builder for getting asset thumbnail
#[derive(Debug)]
pub struct ThumbnailBuilder {
    client: Client,
    id: AssetId,
    size: Option<AssetMediaSize>,
    edited: bool,
}

impl ThumbnailBuilder {
    /// Create a new thumbnail builder
    const fn new(client: Client, id: AssetId) -> Self {
        Self {
            client,
            id,
            size: None,
            edited: false,
        }
    }

    /// Set the thumbnail size
    pub fn size(mut self, size: AssetMediaSize) -> Self {
        self.size = Some(size);
        self
    }

    /// Get the edited version if available
    pub fn edited(mut self) -> Self {
        self.edited = true;
        self
    }

    /// Execute the request
    pub async fn execute(self) -> Result<ThumbnailResponse> {
        let path = format!("/assets/{}/thumbnail", self.id);
        let mut req = self.client.get(&path);

        if let Some(ref size) = self.size {
            let size_str = match size {
                AssetMediaSize::Original => "original",
                AssetMediaSize::Fullsize => "fullsize",
                AssetMediaSize::Preview => "preview",
                AssetMediaSize::Thumbnail => "thumbnail",
            };
            req = req.query(&[("size", size_str)]);
        }

        if self.edited {
            req = req.query(&[("edited", "true")]);
        }

        let response = self.client.execute(req.build()?).await?;

        // Get content type from response headers
        let content_type = response
            .headers()
            .get("content-type")
            .and_then(|ct| ct.to_str().ok())
            .map(String::from)
            .unwrap_or_else(|| "application/octet-stream".to_string());

        let data = response.bytes().await?;

        Ok(ThumbnailResponse { data, content_type })
    }
}