use crate::auth::AuthUser;
use crate::error::ApiError;
use crate::models::{
    AppEvent, NewPersonRequest, Person, PersonActionResponse, PersonResponse, PersonsResponse,
    UpdatePersonRequest,
};
use crate::AppState;
use rocket::serde::json::Json;
use rocket::Route;
use sqlx::QueryBuilder;

enum SearchCondition {
    Checked(bool),
    Inside(bool),
    Query(String),
}

pub fn routes() -> Vec<Route> {
    rocket::routes![
        search_persons,
        list_checked_in,
        checkin_person,
        checkout_person,
        mark_inside,
        mark_outside,
        create_person,
        update_person
    ]
}

#[rocket::get("/search?<q>")]
pub async fn search_persons(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    q: &str,
) -> Result<Json<PersonsResponse>, ApiError> {
    let query = q.trim();
    if query.is_empty() {
        return Err(ApiError::bad_request("Söktext krävs."));
    }

    let like_pattern = format!("%{}%", query);
    let id_value = query.parse::<i32>().ok();

    let persons = if let Some(id) = id_value {
        sqlx::query_as::<_, Person>(
            r#"
            SELECT
                id,
                first_name,
                last_name,
                grade,
                parent_name,
                parent_phone_number,
                checked_in,
                inside,
                visitor,
                sleeping_spot
            FROM persons
            WHERE id = $1
            UNION
            SELECT
                id,
                first_name,
                last_name,
                grade,
                parent_name,
                parent_phone_number,
                checked_in,
                inside,
                visitor,
                sleeping_spot
            FROM persons
            WHERE
                CONCAT(first_name, ' ', last_name) ILIKE $2
                OR parent_name ILIKE $2
                OR parent_phone_number ILIKE $2
            LIMIT 50
            "#,
        )
        .bind(id)
        .bind(&like_pattern)
        .fetch_all(&state.db)
        .await?
    } else {
        sqlx::query_as::<_, Person>(
            r#"
            SELECT
                id,
                first_name,
                last_name,
                grade,
                parent_name,
                parent_phone_number,
                checked_in,
                inside,
                visitor,
                sleeping_spot
            FROM persons
            WHERE
                CONCAT(first_name, ' ', last_name) ILIKE $1
                OR parent_name ILIKE $1
                OR parent_phone_number ILIKE $1
            ORDER BY checked_in DESC, inside DESC, id ASC
            LIMIT 50
            "#,
        )
        .bind(&like_pattern)
        .fetch_all(&state.db)
        .await?
    };

    let response = PersonsResponse {
        persons: persons.into_iter().map(PersonResponse::from).collect(),
    };

    Ok(Json(response))
}

#[rocket::get("/checked-in?<checked>&<status>&<q>")]
pub async fn list_checked_in(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    checked: Option<bool>,
    status: Option<&str>,
    q: Option<&str>,
) -> Result<Json<PersonsResponse>, ApiError> {
    let mut query_builder = QueryBuilder::new(
        r#"
        SELECT
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        FROM persons
        "#,
    );

    let mut conditions = Vec::new();

    if let Some(checked_in) = checked {
        conditions.push(SearchCondition::Checked(checked_in));
    }

    if let Some(status) = status {
        match status {
            "inside" => conditions.push(SearchCondition::Inside(true)),
            "outside" => conditions.push(SearchCondition::Inside(false)),
            _ => {}
        }
    }

    if let Some(query) = q.and_then(|value| {
        let trimmed = value.trim();
        if trimmed.is_empty() {
            None
        } else {
            Some(trimmed.to_string())
        }
    }) {
        conditions.push(SearchCondition::Query(query));
    }

    let mut first = true;
    for condition in &conditions {
        if first {
            query_builder.push(" WHERE ");
            first = false;
        } else {
            query_builder.push(" AND ");
        }

        match condition {
            SearchCondition::Checked(flag) => {
                query_builder.push("checked_in = ");
                query_builder.push_bind(*flag);
            }
            SearchCondition::Inside(flag) => {
                query_builder.push("inside = ");
                query_builder.push_bind(*flag);
            }
            SearchCondition::Query(term) => {
                let like = format!("%{}%", term);
                let starts_with = format!("{}%", term);
                let digits: String = term.chars().filter(|ch| ch.is_ascii_digit()).collect();

                query_builder.push("(");
                query_builder.push("CAST(id AS TEXT) ILIKE ");
                query_builder.push_bind(starts_with.clone());
                query_builder.push(" OR CONCAT(first_name, ' ', last_name) ILIKE ");
                query_builder.push_bind(like.clone());
                query_builder.push(" OR parent_name ILIKE ");
                query_builder.push_bind(like.clone());
                query_builder.push(" OR parent_phone_number ILIKE ");
                query_builder.push_bind(like.clone());

                if !digits.is_empty() {
                    let digits_like = format!("%{}%", digits);
                    query_builder
                        .push(" OR REGEXP_REPLACE(parent_phone_number, '[^0-9]', '', 'g') ILIKE ");
                    query_builder.push_bind(digits_like);
                }

                query_builder.push(")");
            }
        }
    }

    query_builder.push(" ORDER BY checked_in DESC, inside DESC, id ASC");

    let persons = query_builder
        .build_query_as::<Person>()
        .fetch_all(&state.db)
        .await?;

    Ok(Json(PersonsResponse {
        persons: persons.into_iter().map(PersonResponse::from).collect(),
    }))
}

#[rocket::post("/<id>/checkin")]
pub async fn checkin_person(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    id: i32,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let person = sqlx::query_as::<_, Person>(
        r#"
        UPDATE persons
        SET checked_in = true,
            inside = true
        WHERE id = $1
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(id)
    .fetch_optional(&state.db)
    .await?
    .ok_or_else(|| ApiError::not_found("Personen hittades inte."))?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}

#[rocket::post("/<id>/checkout")]
pub async fn checkout_person(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    id: i32,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let person = sqlx::query_as::<_, Person>(
        r#"
        UPDATE persons
        SET checked_in = false, inside = false
        WHERE id = $1
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(id)
    .fetch_optional(&state.db)
    .await?
    .ok_or_else(|| ApiError::not_found("Personen hittades inte."))?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}

#[rocket::post("/<id>/inside")]
pub async fn mark_inside(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    id: i32,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let person = sqlx::query_as::<_, Person>(
        r#"
        UPDATE persons
        SET inside = true
        WHERE id = $1
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(id)
    .fetch_optional(&state.db)
    .await?
    .ok_or_else(|| ApiError::not_found("Personen hittades inte."))?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}

#[rocket::post("/<id>/outside")]
pub async fn mark_outside(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    id: i32,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let person = sqlx::query_as::<_, Person>(
        r#"
        UPDATE persons
        SET inside = false
        WHERE id = $1
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(id)
    .fetch_optional(&state.db)
    .await?
    .ok_or_else(|| ApiError::not_found("Personen hittades inte."))?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}

#[rocket::post("/", data = "<payload>")]
pub async fn create_person(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    payload: Json<NewPersonRequest>,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let data = payload.into_inner();

    if data.first_name.trim().is_empty() {
        return Err(ApiError::bad_request("Förnamn krävs."));
    }

    if data.last_name.trim().is_empty() {
        return Err(ApiError::bad_request("Efternamn krävs."));
    }

    if let Some(ref phone) = data.parent_phone_number {
        let digits: String = phone.chars().filter(|c| c.is_ascii_digit()).collect();
        if digits.len() != 10 {
            return Err(ApiError::bad_request(
                "Telefonnumret måste innehålla tio siffror.",
            ));
        }
    }

    let person = sqlx::query_as::<_, Person>(
        r#"
        INSERT INTO persons (
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot,
            id
        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9,
            CASE WHEN $10 IS NULL THEN nextval('persons_id_seq') ELSE $10 END
        )
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(data.first_name.trim())
    .bind(data.last_name.trim())
    .bind(data.grade)
    .bind(data.parent_name.map(|v| v.trim().to_string()))
    .bind(data.parent_phone_number.map(|v| v.trim().to_string()))
    .bind(data.checked_in.unwrap_or(false))
    .bind(data.inside.unwrap_or(false))
    .bind(data.visitor.unwrap_or(false))
    .bind(data.sleeping_spot.unwrap_or(false))
    .bind(data.id)
    .fetch_one(&state.db)
    .await?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}

#[rocket::put("/<id>", data = "<payload>")]
pub async fn update_person(
    _user: AuthUser,
    state: &rocket::State<AppState>,
    id: i32,
    payload: Json<UpdatePersonRequest>,
) -> Result<Json<PersonActionResponse>, ApiError> {
    let data = payload.into_inner();

    if data.first_name.trim().is_empty() {
        return Err(ApiError::bad_request("Förnamn krävs."));
    }

    if data.last_name.trim().is_empty() {
        return Err(ApiError::bad_request("Efternamn krävs."));
    }

    if let Some(ref phone) = data.parent_phone_number {
        let digits: String = phone.chars().filter(|c| c.is_ascii_digit()).collect();
        if digits.len() != 10 {
            return Err(ApiError::bad_request(
                "Telefonnumret måste innehålla tio siffror.",
            ));
        }
    }

    let person = sqlx::query_as::<_, Person>(
        r#"
        UPDATE persons
        SET
            first_name = $2,
            last_name = $3,
            grade = $4,
            parent_name = $5,
            parent_phone_number = $6,
            checked_in = COALESCE($7, checked_in),
            inside = COALESCE($8, inside),
            visitor = $9,
            sleeping_spot = $10
        WHERE id = $1
        RETURNING
            id,
            first_name,
            last_name,
            grade,
            parent_name,
            parent_phone_number,
            checked_in,
            inside,
            visitor,
            sleeping_spot
        "#,
    )
    .bind(id)
    .bind(data.first_name.trim())
    .bind(data.last_name.trim())
    .bind(data.grade)
    .bind(data.parent_name.map(|v| v.trim().to_string()))
    .bind(data.parent_phone_number.map(|v| v.trim().to_string()))
    .bind(data.checked_in)
    .bind(data.inside)
    .bind(data.visitor)
    .bind(data.sleeping_spot)
    .fetch_optional(&state.db)
    .await?
    .ok_or_else(|| ApiError::not_found("Personen hittades inte."))?;

    let response = PersonActionResponse {
        person: person.clone().into(),
    };

    let _ = state.event_sender.send(AppEvent::PersonUpdated {
        person: response.person.clone(),
    });

    Ok(Json(response))
}