use axum::{
    extract::{ConnectInfo, Path, Query, State},
    http::{HeaderMap, StatusCode},
    response::Json,
};
use log::warn;
use serde_json::json;
use std::collections::HashMap;
use std::net::SocketAddr;

use crate::db;
use super::common::{AppState, ApiResponse, ItemInfo, TagsQuery, check_auth};

pub async fn handle_list_items(
    State(state): State<AppState>,
    Query(params): Query<TagsQuery>,
    headers: HeaderMap,
    ConnectInfo(addr): ConnectInfo<SocketAddr>,
) -> Result<Json<ApiResponse<Vec<ItemInfo>>>, StatusCode> {
    if !check_auth(&headers, &state.password) {
        warn!("Unauthorized request to /item/ from {}", addr);
        return Err(StatusCode::UNAUTHORIZED);
    }
    
    let mut conn = state.db.lock().await;
    
    let tags: Vec<String> = params.tags
        .map(|s| s.split(',').map(|t| t.trim().to_string()).collect())
        .unwrap_or_default();
    
    let items = if tags.is_empty() {
        db::get_items(&mut *conn).map_err(|e| {
            warn!("Failed to get items: {}", e);
            StatusCode::INTERNAL_SERVER_ERROR
        })?
    } else {
        db::get_items_matching(&mut *conn, &tags, &HashMap::new())
            .map_err(|e| {
                warn!("Failed to get items matching tags {:?}: {}", tags, e);
                StatusCode::INTERNAL_SERVER_ERROR
            })?
    };
    
    // Get item IDs for batch queries
    let item_ids: Vec<i64> = items.iter().filter_map(|item| item.id).collect();
    
    // Get tags and metadata for all items
    let tags_map = db::get_tags_for_items(&mut *conn, &item_ids)
        .map_err(|e| {
            warn!("Failed to get tags for items: {}", e);
            StatusCode::INTERNAL_SERVER_ERROR
        })?;
    let meta_map = db::get_meta_for_items(&mut *conn, &item_ids)
        .map_err(|e| {
            warn!("Failed to get metadata for items: {}", e);
            StatusCode::INTERNAL_SERVER_ERROR
        })?;
    
    let item_infos: Vec<ItemInfo> = items
        .into_iter()
        .map(|item| {
            let item_id = item.id.unwrap_or(0);
            let item_tags = tags_map.get(&item_id)
                .map(|tags| tags.iter().map(|t| t.name.clone()).collect())
                .unwrap_or_default();
            let item_meta = meta_map.get(&item_id)
                .cloned()
                .unwrap_or_default();
            
            ItemInfo {
                id: item_id,
                ts: item.ts.to_rfc3339(),
                size: item.size,
                compression: item.compression,
                tags: item_tags,
                metadata: item_meta,
            }
        })
        .collect();
    
    let response = ApiResponse {
        success: true,
        data: Some(item_infos),
        error: None,
    };
    
    Ok(Json(response))
}

pub async fn handle_get_item(
    State(state): State<AppState>,
    Path(item_id): Path<String>,
    Query(params): Query<TagsQuery>,
    headers: HeaderMap,
    ConnectInfo(addr): ConnectInfo<SocketAddr>,
) -> Result<Json<ApiResponse<ItemInfo>>, StatusCode> {
    if !check_auth(&headers, &state.password) {
        warn!("Unauthorized request to /item/{} from {}", item_id, addr);
        return Err(StatusCode::UNAUTHORIZED);
    }
    
    let mut conn = state.db.lock().await;
    
    let item = if let Ok(id) = item_id.parse::<i64>() {
        db::get_item(&mut *conn, id).map_err(|e| {
            warn!("Failed to get item {}: {}", id, e);
            StatusCode::INTERNAL_SERVER_ERROR
        })?
    } else {
        // Try to find by tags
        if let Some(tags_str) = params.tags {
            let tags: Vec<String> = tags_str.split(',').map(|t| t.trim().to_string()).collect();
            db::get_item_matching(&mut *conn, &tags, &HashMap::new())
                .map_err(|e| {
                    warn!("Failed to get item matching tags {:?}: {}", tags, e);
                    StatusCode::INTERNAL_SERVER_ERROR
                })?
        } else {
            warn!("Invalid item ID '{}' and no tags provided", item_id);
            return Err(StatusCode::BAD_REQUEST);
        }
    };
    
    if let Some(item) = item {
        let item_tags = db::get_item_tags(&mut *conn, &item)
            .map_err(|e| {
                warn!("Failed to get tags for item {}: {}", item.id.unwrap_or(0), e);
                StatusCode::INTERNAL_SERVER_ERROR
            })?
            .into_iter()
            .map(|t| t.name)
            .collect();
        let item_meta = db::get_item_meta(&mut *conn, &item)
            .map_err(|e| {
                warn!("Failed to get metadata for item {}: {}", item.id.unwrap_or(0), e);
                StatusCode::INTERNAL_SERVER_ERROR
            })?
            .into_iter()
            .map(|m| (m.name, m.value))
            .collect();
        
        let item_info = ItemInfo {
            id: item.id.unwrap_or(0),
            ts: item.ts.to_rfc3339(),
            size: item.size,
            compression: item.compression,
            tags: item_tags,
            metadata: item_meta,
        };
        
        let response = ApiResponse {
            success: true,
            data: Some(item_info),
            error: None,
        };
        
        Ok(Json(response))
    } else {
        Err(StatusCode::NOT_FOUND)
    }
}

pub async fn handle_put_item(
    State(state): State<AppState>,
    headers: HeaderMap,
    ConnectInfo(addr): ConnectInfo<SocketAddr>,
) -> Result<Json<ApiResponse<ItemInfo>>, StatusCode> {
    if !check_auth(&headers, &state.password) {
        warn!("Unauthorized request to PUT /item/ from {}", addr);
        return Err(StatusCode::UNAUTHORIZED);
    }
    
    // This is a simplified implementation
    // In a real implementation, you'd need to properly parse multipart/form-data
    // or JSON payload with the item data
    
    let response = ApiResponse::<ItemInfo> {
        success: false,
        data: None,
        error: Some("PUT /item/ not yet implemented".to_string()),
    };
    
    Ok(Json(response))
}

pub async fn handle_delete_item(
    State(state): State<AppState>,
    Path(item_id): Path<String>,
    headers: HeaderMap,
    ConnectInfo(addr): ConnectInfo<SocketAddr>,
) -> Result<Json<ApiResponse<()>>, StatusCode> {
    if !check_auth(&headers, &state.password) {
        warn!("Unauthorized request to DELETE /item/{} from {}", item_id, addr);
        return Err(StatusCode::UNAUTHORIZED);
    }
    
    if let Ok(id) = item_id.parse::<i64>() {
        let mut conn = state.db.lock().await;
        
        if let Some(item) = db::get_item(&mut *conn, id).map_err(|e| {
            warn!("Failed to get item {} for deletion: {}", id, e);
            StatusCode::INTERNAL_SERVER_ERROR
        })? {
            db::delete_item(&mut *conn, item).map_err(|e| {
                warn!("Failed to delete item {}: {}", id, e);
                StatusCode::INTERNAL_SERVER_ERROR
            })?;
            
            let response = ApiResponse::<()> {
                success: true,
                data: None,
                error: None,
            };
            Ok(Json(response))
        } else {
            Err(StatusCode::NOT_FOUND)
        }
    } else {
        Err(StatusCode::BAD_REQUEST)
    }
}

pub fn get_items_openapi_spec() -> serde_json::Value {
    json!({
        "/item/": {
            "get": {
                "summary": "List items",
                "parameters": [
                    {
                        "name": "tags",
                        "in": "query",
                        "schema": {"type": "string"},
                        "description": "Comma-separated list of tags to filter by"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "List of items",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "type": "array",
                                    "items": {"$ref": "#/components/schemas/ItemInfo"}
                                }
                            }
                        }
                    }
                }
            },
            "put": {
                "summary": "Add new item",
                "responses": {
                    "201": {
                        "description": "Item created",
                        "content": {
                            "application/json": {
                                "schema": {"$ref": "#/components/schemas/ItemInfo"}
                            }
                        }
                    }
                }
            }
        },
        "/item/{id}": {
            "get": {
                "summary": "Get item by ID",
                "parameters": [
                    {
                        "name": "id",
                        "in": "path",
                        "required": true,
                        "schema": {"type": "string"},
                        "description": "Item ID or use tags query parameter"
                    },
                    {
                        "name": "tags",
                        "in": "query",
                        "schema": {"type": "string"},
                        "description": "Comma-separated list of tags (when ID is not numeric)"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "Item information",
                        "content": {
                            "application/json": {
                                "schema": {"$ref": "#/components/schemas/ItemInfo"}
                            }
                        }
                    },
                    "404": {"description": "Item not found"}
                }
            },
            "delete": {
                "summary": "Delete item by ID",
                "parameters": [
                    {
                        "name": "id",
                        "in": "path",
                        "required": true,
                        "schema": {"type": "integer"}
                    }
                ],
                "responses": {
                    "200": {"description": "Item deleted"},
                    "404": {"description": "Item not found"}
                }
            }
        }
    })
}