use anyhow::Result;
use reqwest::Client;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

#[derive(Clone)]
pub struct ApiClient {
    client: Client,
    base_url: String,
}

// Response types (mirror server DTOs)
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct MediaResponse {
    pub id: String,
    pub path: String,
    pub file_name: String,
    pub media_type: String,
    pub content_hash: String,
    pub file_size: u64,
    pub title: Option<String>,
    pub artist: Option<String>,
    pub album: Option<String>,
    pub genre: Option<String>,
    pub year: Option<i32>,
    pub duration_secs: Option<f64>,
    pub description: Option<String>,
    #[serde(default)]
    pub has_thumbnail: bool,
    pub custom_fields: HashMap<String, CustomFieldResponse>,
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct CustomFieldResponse {
    pub field_type: String,
    pub value: String,
}

#[derive(Debug, Clone, Deserialize)]
pub struct ImportResponse {
    pub media_id: String,
    pub was_duplicate: bool,
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct TagResponse {
    pub id: String,
    pub name: String,
    pub parent_id: Option<String>,
    pub created_at: String,
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct CollectionResponse {
    pub id: String,
    pub name: String,
    pub description: Option<String>,
    pub kind: String,
    pub filter_query: Option<String>,
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Debug, Clone, Deserialize)]
pub struct SearchResponse {
    pub items: Vec<MediaResponse>,
    pub total_count: u64,
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct AuditEntryResponse {
    pub id: String,
    pub media_id: Option<String>,
    pub action: String,
    pub details: Option<String>,
    pub timestamp: String,
}

#[derive(Debug, Clone, Deserialize)]
pub struct ScanResponse {
    pub files_found: usize,
    pub files_processed: usize,
    pub errors: Vec<String>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct DatabaseStatsResponse {
    pub media_count: u64,
    pub tag_count: u64,
    pub collection_count: u64,
    pub audit_count: u64,
    pub database_size_bytes: u64,
    pub backend_name: String,
}

#[derive(Debug, Clone, Deserialize)]
pub struct DuplicateGroupResponse {
    pub content_hash: String,
    pub items: Vec<MediaResponse>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct JobResponse {
    pub id: String,
    pub kind: serde_json::Value,
    pub status: serde_json::Value,
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Debug, Clone, Deserialize)]
pub struct ScheduledTaskResponse {
    pub id: String,
    pub name: String,
    pub schedule: String,
    pub enabled: bool,
    pub last_run: Option<String>,
    pub next_run: Option<String>,
    pub last_status: Option<String>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct LibraryStatisticsResponse {
    pub total_media: u64,
    pub total_size_bytes: u64,
    pub avg_file_size_bytes: u64,
    pub media_by_type: Vec<TypeCount>,
    pub storage_by_type: Vec<TypeCount>,
    pub newest_item: Option<String>,
    pub oldest_item: Option<String>,
    pub top_tags: Vec<TypeCount>,
    pub top_collections: Vec<TypeCount>,
    pub total_tags: u64,
    pub total_collections: u64,
    pub total_duplicates: u64,
}

#[derive(Debug, Clone, Deserialize)]
pub struct TypeCount {
    pub name: String,
    pub count: u64,
}

impl ApiClient {
    pub fn new(base_url: &str) -> Self {
        Self {
            client: Client::new(),
            base_url: base_url.trim_end_matches('/').to_string(),
        }
    }

    fn url(&self, path: &str) -> String {
        format!("{}/api/v1{}", self.base_url, path)
    }

    pub async fn list_media(&self, offset: u64, limit: u64) -> Result<Vec<MediaResponse>> {
        let resp = self
            .client
            .get(self.url("/media"))
            .query(&[("offset", offset.to_string()), ("limit", limit.to_string())])
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn get_media(&self, id: &str) -> Result<MediaResponse> {
        let resp = self
            .client
            .get(self.url(&format!("/media/{id}")))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn import_file(&self, path: &str) -> Result<ImportResponse> {
        let resp = self
            .client
            .post(self.url("/media/import"))
            .json(&serde_json::json!({"path": path}))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn delete_media(&self, id: &str) -> Result<()> {
        self.client
            .delete(self.url(&format!("/media/{id}")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn open_media(&self, id: &str) -> Result<()> {
        self.client
            .post(self.url(&format!("/media/{id}/open")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn search(&self, query: &str, offset: u64, limit: u64) -> Result<SearchResponse> {
        let resp = self
            .client
            .get(self.url("/search"))
            .query(&[
                ("q", query.to_string()),
                ("offset", offset.to_string()),
                ("limit", limit.to_string()),
            ])
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn list_tags(&self) -> Result<Vec<TagResponse>> {
        let resp = self
            .client
            .get(self.url("/tags"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn create_tag(&self, name: &str, parent_id: Option<&str>) -> Result<TagResponse> {
        let mut body = serde_json::json!({"name": name});
        if let Some(pid) = parent_id {
            body["parent_id"] = serde_json::Value::String(pid.to_string());
        }
        let resp = self
            .client
            .post(self.url("/tags"))
            .json(&body)
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn delete_tag(&self, id: &str) -> Result<()> {
        self.client
            .delete(self.url(&format!("/tags/{id}")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn tag_media(&self, media_id: &str, tag_id: &str) -> Result<()> {
        self.client
            .post(self.url(&format!("/media/{media_id}/tags")))
            .json(&serde_json::json!({"tag_id": tag_id}))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn untag_media(&self, media_id: &str, tag_id: &str) -> Result<()> {
        self.client
            .delete(self.url(&format!("/media/{media_id}/tags/{tag_id}")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn get_media_tags(&self, media_id: &str) -> Result<Vec<TagResponse>> {
        let resp = self
            .client
            .get(self.url(&format!("/media/{media_id}/tags")))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn list_collections(&self) -> Result<Vec<CollectionResponse>> {
        let resp = self
            .client
            .get(self.url("/collections"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn delete_collection(&self, id: &str) -> Result<()> {
        self.client
            .delete(self.url(&format!("/collections/{id}")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn trigger_scan(&self, path: Option<&str>) -> Result<Vec<ScanResponse>> {
        let body = match path {
            Some(p) => serde_json::json!({"path": p}),
            None => serde_json::json!({"path": null}),
        };
        let resp = self
            .client
            .post(self.url("/scan"))
            .json(&body)
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn list_audit(&self, offset: u64, limit: u64) -> Result<Vec<AuditEntryResponse>> {
        let resp = self
            .client
            .get(self.url("/audit"))
            .query(&[("offset", offset.to_string()), ("limit", limit.to_string())])
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn find_duplicates(&self) -> Result<Vec<DuplicateGroupResponse>> {
        let resp = self
            .client
            .get(self.url("/duplicates"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn database_stats(&self) -> Result<DatabaseStatsResponse> {
        let resp = self
            .client
            .get(self.url("/database/stats"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn list_jobs(&self) -> Result<Vec<JobResponse>> {
        let resp = self
            .client
            .get(self.url("/jobs"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn vacuum_database(&self) -> Result<()> {
        self.client
            .post(self.url("/database/vacuum"))
            .json(&serde_json::json!({}))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn update_media(
        &self,
        id: &str,
        updates: serde_json::Value,
    ) -> Result<MediaResponse> {
        let resp = self
            .client
            .patch(self.url(&format!("/media/{id}")))
            .json(&updates)
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn library_statistics(&self) -> Result<LibraryStatisticsResponse> {
        let resp = self
            .client
            .get(self.url("/statistics"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn list_scheduled_tasks(&self) -> Result<Vec<ScheduledTaskResponse>> {
        let resp = self
            .client
            .get(self.url("/tasks/scheduled"))
            .send()
            .await?
            .error_for_status()?
            .json()
            .await?;
        Ok(resp)
    }

    pub async fn toggle_scheduled_task(&self, id: &str) -> Result<()> {
        self.client
            .post(self.url(&format!("/tasks/scheduled/{id}/toggle")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }

    pub async fn run_task_now(&self, id: &str) -> Result<()> {
        self.client
            .post(self.url(&format!("/tasks/scheduled/{id}/run-now")))
            .send()
            .await?
            .error_for_status()?;
        Ok(())
    }
}