// src/tables_data/handlers/put_table_data.rs

use tonic::Status;
use sqlx::{PgPool, Arguments};
use sqlx::postgres::PgArguments;
use chrono::{DateTime, Utc};
use common::proto::multieko2::tables_data::{PutTableDataRequest, PutTableDataResponse};
use std::collections::HashMap;
use std::sync::Arc;
use prost_types::value::Kind;
use rust_decimal::Decimal;
use std::str::FromStr;

use crate::steel::server::execution::{self, Value};
use crate::steel::server::functions::SteelContext;
use crate::indexer::{IndexCommand, IndexCommandData};
use tokio::sync::mpsc;
use tracing::error;

pub async fn put_table_data(
    db_pool: &PgPool,
    request: PutTableDataRequest,
    indexer_tx: &mpsc::Sender<IndexCommand>,
) -> Result<PutTableDataResponse, Status> {
    let profile_name = request.profile_name;
    let table_name = request.table_name;
    let record_id = request.id;

    // An update with no fields is a no-op; we can return success early.
    if request.data.is_empty() {
        return Ok(PutTableDataResponse {
            success: true,
            message: "No fields to update.".into(),
            updated_id: record_id,
        });
    }

    // --- Start of logic copied and adapted from post_table_data ---

    let schema = sqlx::query!(
        "SELECT id FROM schemas WHERE name = $1",
        profile_name
    )
    .fetch_optional(db_pool)
    .await
    .map_err(|e| Status::internal(format!("Profile lookup error: {}", e)))?;

    let schema_id = schema.ok_or_else(|| Status::not_found("Profile not found"))?.id;

    let table_def = sqlx::query!(
        r#"SELECT id, columns FROM table_definitions
        WHERE schema_id = $1 AND table_name = $2"#,
        schema_id,
        table_name
    )
    .fetch_optional(db_pool)
    .await
    .map_err(|e| Status::internal(format!("Table lookup error: {}", e)))?;

    let table_def = table_def.ok_or_else(|| Status::not_found("Table not found"))?;

    let columns_json: Vec<String> = serde_json::from_value(table_def.columns.clone())
        .map_err(|e| Status::internal(format!("Column parsing error: {}", e)))?;

    let mut columns = Vec::new();
    for col_def in columns_json {
        let parts: Vec<&str> = col_def.splitn(2, ' ').collect();
        if parts.len() != 2 {
            return Err(Status::internal("Invalid column format"));
        }
        let name = parts[0].trim_matches('"').to_string();
        let sql_type = parts[1].to_string();
        columns.push((name, sql_type));
    }

    let fk_columns = sqlx::query!(
        r#"SELECT ltd.table_name
        FROM table_definition_links tdl
        JOIN table_definitions ltd ON tdl.linked_table_id = ltd.id
        WHERE tdl.source_table_id = $1"#,
        table_def.id
    )
    .fetch_all(db_pool)
    .await
    .map_err(|e| Status::internal(format!("Foreign key lookup error: {}", e)))?;

    let mut system_columns = vec!["deleted".to_string()];
    for fk in fk_columns {
        system_columns.push(format!("{}_id", fk.table_name));
    }

    let system_columns_set: std::collections::HashSet<_> = system_columns.iter().map(|s| s.as_str()).collect();

    let user_columns: Vec<&String> = columns.iter().map(|(name, _)| name).collect();
    for key in request.data.keys() {
        if !system_columns_set.contains(key.as_str()) &&
           !user_columns.contains(&&key.to_string()) {
            return Err(Status::invalid_argument(format!("Invalid column: {}", key)));
        }
    }

    let mut string_data_for_scripts = HashMap::new();
    for (key, proto_value) in &request.data {
        let str_val = match &proto_value.kind {
            Some(Kind::StringValue(s)) => {
                let trimmed = s.trim();
                if trimmed.is_empty() {
                    continue;
                }
                trimmed.to_string()
            },
            Some(Kind::NumberValue(n)) => n.to_string(),
            Some(Kind::BoolValue(b)) => b.to_string(),
            Some(Kind::NullValue(_)) | None => continue,
            Some(Kind::StructValue(_)) | Some(Kind::ListValue(_)) => {
                return Err(Status::invalid_argument(format!("Unsupported type for script validation in column '{}'", key)));
            }
        };
        string_data_for_scripts.insert(key.clone(), str_val);
    }

    let scripts = sqlx::query!(
        "SELECT target_column, script FROM table_scripts WHERE table_definitions_id = $1",
        table_def.id
    )
    .fetch_all(db_pool)
    .await
    .map_err(|e| Status::internal(format!("Failed to fetch scripts: {}", e)))?;

    for script_record in scripts {
        let target_column = script_record.target_column;

        if let Some(user_value) = string_data_for_scripts.get(&target_column) {
            let context = SteelContext {
                current_table: table_name.clone(),
                schema_id,
                schema_name: profile_name.clone(),
                row_data: string_data_for_scripts.clone(),
                db_pool: Arc::new(db_pool.clone()),
            };

            let script_result = execution::execute_script(
                script_record.script,
                "STRINGS",
                Arc::new(db_pool.clone()),
                context,
            )
            .map_err(|e| Status::invalid_argument(
                format!("Script execution failed for '{}': {}", target_column, e)
            ))?;

            let Value::Strings(mut script_output) = script_result else {
                return Err(Status::internal("Script must return string values"));
            };

            let expected_value = script_output.pop()
                .ok_or_else(|| Status::internal("Script returned no values"))?;

            if user_value != &expected_value {
                return Err(Status::invalid_argument(format!(
                    "Validation failed for column '{}': Expected '{}', Got '{}'",
                    target_column, expected_value, user_value
                )));
            }
        }
    }

    let mut params = PgArguments::default();
    let mut set_clauses = Vec::new();
    let mut param_idx = 1;

    for (col, proto_value) in request.data {
        let sql_type = if system_columns_set.contains(col.as_str()) {
            match col.as_str() {
                "deleted" => "BOOLEAN",
                _ if col.ends_with("_id") => "BIGINT",
                _ => return Err(Status::invalid_argument("Invalid system column")),
            }
        } else {
            columns.iter()
                .find(|(name, _)| name == &col)
                .map(|(_, sql_type)| sql_type.as_str())
                .ok_or_else(|| Status::invalid_argument(format!("Column not found: {}", col)))?
        };

        let kind = match &proto_value.kind {
            None | Some(Kind::NullValue(_)) => {
                match sql_type {
                    "BOOLEAN" => params.add(None::<bool>),
                    "TEXT" => params.add(None::<String>),
                    "TIMESTAMPTZ" => params.add(None::<DateTime<Utc>>),
                    "BIGINT" => params.add(None::<i64>),
                    "INTEGER" => params.add(None::<i32>),
                    s if s.starts_with("NUMERIC") => params.add(None::<Decimal>),
                    _ => return Err(Status::invalid_argument(format!("Unsupported type for null value: {}", sql_type))),
                }.map_err(|e| Status::internal(format!("Failed to add null parameter for {}: {}", col, e)))?;

                set_clauses.push(format!("\"{}\" = ${}", col, param_idx));
                param_idx += 1;
                continue;
            }
            Some(k) => k,
        };

        if sql_type == "TEXT" {
            if let Kind::StringValue(value) = kind {
                let trimmed_value = value.trim();

                if trimmed_value.is_empty() {
                    params.add(None::<String>).map_err(|e| Status::internal(format!("Failed to add null parameter for {}: {}", col, e)))?;
                } else {
                    if col == "telefon" && trimmed_value.len() > 15 {
                        return Err(Status::internal(format!("Value too long for {}", col)));
                    }
                    params.add(trimmed_value).map_err(|e| Status::invalid_argument(format!("Failed to add text parameter for {}: {}", col, e)))?;
                }
            } else {
                return Err(Status::invalid_argument(format!("Expected string for column '{}'", col)));
            }
        } else if sql_type == "BOOLEAN" {
            if let Kind::BoolValue(val) = kind {
                params.add(val).map_err(|e| Status::invalid_argument(format!("Failed to add boolean parameter for {}: {}", col, e)))?;
            } else {
                return Err(Status::invalid_argument(format!("Expected boolean for column '{}'", col)));
            }
        } else if sql_type == "TIMESTAMPTZ" {
            if let Kind::StringValue(value) = kind {
                let dt = DateTime::parse_from_rfc3339(value).map_err(|_| Status::invalid_argument(format!("Invalid timestamp for {}", col)))?;
                params.add(dt.with_timezone(&Utc)).map_err(|e| Status::invalid_argument(format!("Failed to add timestamp parameter for {}: {}", col, e)))?;
            } else {
                return Err(Status::invalid_argument(format!("Expected ISO 8601 string for column '{}'", col)));
            }
        } else if sql_type == "BIGINT" {
            if let Kind::NumberValue(val) = kind {
                if val.fract() != 0.0 {
                    return Err(Status::invalid_argument(format!("Expected integer for column '{}', but got a float", col)));
                }
                let as_i64 = *val as i64;
                if (as_i64 as f64) != *val {
                    return Err(Status::invalid_argument(format!("Integer value out of range for BIGINT column '{}'", col)));
                }
                params.add(as_i64).map_err(|e| Status::invalid_argument(format!("Failed to add bigint parameter for {}: {}", col, e)))?;
            } else {
                return Err(Status::invalid_argument(format!("Expected number for column '{}'", col)));
            }
        } else if sql_type == "INTEGER" {
            if let Kind::NumberValue(val) = kind {
                if val.fract() != 0.0 {
                    return Err(Status::invalid_argument(format!("Expected integer for column '{}', but got a float", col)));
                }
                let as_i32 = *val as i32;
                if (as_i32 as f64) != *val {
                    return Err(Status::invalid_argument(format!("Integer value out of range for INTEGER column '{}'", col)));
                }
                params.add(as_i32).map_err(|e| Status::invalid_argument(format!("Failed to add integer parameter for {}: {}", col, e)))?;
            } else {
                return Err(Status::invalid_argument(format!("Expected number for column '{}'", col)));
            }
        } else if sql_type.starts_with("NUMERIC") {
            let decimal_val = match kind {
                Kind::StringValue(s) => {
                    let trimmed = s.trim();
                    if trimmed.is_empty() {
                        None
                    } else {
                        Some(Decimal::from_str(trimmed).map_err(|_| {
                            Status::invalid_argument(format!(
                                "Invalid decimal string format for column '{}': {}",
                                col, s
                            ))
                        })?)
                    }
                }
                _ => {
                    return Err(Status::invalid_argument(format!(
                        "Expected a string representation for decimal column '{}', but received a different type.",
                        col
                    )));
                }
            };
            params.add(decimal_val).map_err(|e| {
                Status::invalid_argument(format!(
                    "Failed to add decimal parameter for {}: {}",
                    col, e
                ))
            })?;
        } else {
            return Err(Status::invalid_argument(format!("Unsupported type {}", sql_type)));
        }

        set_clauses.push(format!("\"{}\" = ${}", col, param_idx));
        param_idx += 1;
    }

    // --- End of copied logic ---

    if set_clauses.is_empty() {
        return Ok(PutTableDataResponse {
            success: true,
            message: "No valid fields to update after processing.".into(),
            updated_id: record_id,
        });
    }

    let qualified_table = crate::shared::schema_qualifier::qualify_table_name_for_data(
        db_pool,
        &profile_name,
        &table_name,
    )
    .await?;

    let set_clause = set_clauses.join(", ");
    let sql = format!(
        "UPDATE {} SET {} WHERE id = ${} RETURNING id",
        qualified_table,
        set_clause,
        param_idx
    );

    params.add(record_id).map_err(|e| Status::internal(format!("Failed to add record_id parameter: {}", e)))?;

    let result = sqlx::query_scalar_with::<_, i64, _>(&sql, params)
        .fetch_optional(db_pool)
        .await;

    let updated_id = match result {
        Ok(Some(id)) => id,
        Ok(None) => return Err(Status::not_found("Record not found")),
        Err(e) => {
            if let Some(db_err) = e.as_database_error() {
                if db_err.code() == Some(std::borrow::Cow::Borrowed("22P02")) ||
                   db_err.code() == Some(std::borrow::Cow::Borrowed("22003")) {
                     return Err(Status::invalid_argument(format!(
                        "Numeric field overflow or invalid format. Check precision and scale. Details: {}", db_err.message()
                    )));
                }
            }
            return Err(Status::internal(format!("Update failed: {}", e)));
        }
    };

    let command = IndexCommand::AddOrUpdate(IndexCommandData {
        table_name: table_name.clone(),
        row_id: updated_id,
    });

    if let Err(e) = indexer_tx.send(command).await {
        error!(
            "CRITICAL: DB update for table '{}' (id: {}) succeeded but failed to queue for indexing: {}. Search index is now inconsistent.",
            table_name, updated_id, e
        );
    }

    Ok(PutTableDataResponse {
        success: true,
        message: "Data updated successfully".into(),
        updated_id,
    })
}