use std::collections::HashMap;
use std::str::FromStr;

use collab_database::fields::Field;
use collab_database::rows::{get_field_type_from_cell, Cell, Cells};

use flowy_error::{FlowyError, FlowyResult};
use lib_infra::box_any::BoxAny;

use crate::entities::{CheckboxCellDataPB, FieldType};
use crate::services::cell::{CellCache, CellProtobufBlob};
use crate::services::field::*;
use crate::services::group::make_no_status_group;

/// Decode the opaque cell data into readable format content
pub trait CellDataDecoder: TypeOption {
  /// Decodes the [Cell] into a `CellData` of this `TypeOption`'s field type.
  /// The `field_type` of the `Cell` should be the same as that of this
  /// `TypeOption`.
  ///
  /// # Arguments
  ///
  /// * `cell`: the cell to be decoded
  ///
  fn decode_cell(&self, cell: &Cell) -> FlowyResult<<Self as TypeOption>::CellData>;

  /// Decodes the [Cell] that is of a particular field type into a `CellData` of this `TypeOption`'s field type.
  ///
  /// # Arguments
  ///
  /// * `cell`: the cell to be decoded
  /// * `from_field_type`: the original field type of the `cell``
  /// * `field`: the `Field` which this cell belongs to
  ///
  fn decode_cell_with_transform(
    &self,
    _cell: &Cell,
    _from_field_type: FieldType,
    _field: &Field,
  ) -> Option<<Self as TypeOption>::CellData> {
    None
  }

  /// Decode the cell data to a readable `String`
  /// For example, The string of the Multi-Select cell will be a list of the option's name
  /// separated by a comma.
  ///
  fn stringify_cell_data(&self, cell_data: <Self as TypeOption>::CellData) -> String;

  /// Decode the cell into f64
  /// Different field type has different way to decode the cell data into f64
  /// If the field type doesn't support to decode the cell data into f64, it will return None
  ///
  fn numeric_cell(&self, cell: &Cell) -> Option<f64>;
}

pub trait CellDataChangeset: TypeOption {
  /// Applies a changeset to a given cell, returning the new `Cell` and
  /// `TypeOption::CellData`
  ///
  /// # Arguments
  ///
  /// * `changeset`: the cell changeset that represents the changes of the cell.
  /// * `cell`: the data of the cell. It might be `None`` if the cell does not contain any data.
  ///
  fn apply_changeset(
    &self,
    changeset: <Self as TypeOption>::CellChangeset,
    cell: Option<Cell>,
  ) -> FlowyResult<(Cell, <Self as TypeOption>::CellData)>;
}

/// Applies a cell changeset to a cell
///
/// Check `TypeOptionCellDataHandler::handle_cell_changeset` for more details
///
/// # Arguments
///
/// * `changeset`: The cell changeset to be applied
/// * `cell`: The cell to be changed
/// * `field`: The field which the cell belongs to
/// * `cell_data_cache`: for quickly getting cell data
///
pub fn apply_cell_changeset(
  changeset: BoxAny,
  cell: Option<Cell>,
  field: &Field,
  cell_data_cache: Option<CellCache>,
) -> Result<Cell, FlowyError> {
  match TypeOptionCellExt::new(field, cell_data_cache).get_type_option_cell_data_handler() {
    None => Ok(Cell::default()),
    Some(handler) => Ok(handler.handle_cell_changeset(changeset, cell, field)?),
  }
}

/// Gets the cell protobuf of a cell, returning default when parsing isn't
/// successful.
///
/// Check `TypeOptionCellDataHandler::handle_get_protobuf_cell_data` for more
/// details
///
/// # Arguments
///
/// * `cell`: The cell from which the protobuf should be created
/// * `field`: The field which the cell belongs to
/// * `cell_data_cache`: for quickly getting cell data
///
pub fn get_cell_protobuf(
  cell: &Cell,
  field: &Field,
  cell_data_cache: Option<CellCache>,
) -> CellProtobufBlob {
  match TypeOptionCellExt::new(field, cell_data_cache).get_type_option_cell_data_handler() {
    None => CellProtobufBlob::default(),
    Some(handler) => handler
      .handle_get_protobuf_cell_data(cell, field)
      .unwrap_or_default(),
  }
}

/// Returns a string that represents the cell's data. Using the field type of the cell and the field's type option, create a TypeOptionCellDataHandler. Then,
/// get the cell data in that field type and stringify it.
///
/// # Arguments
///
/// * `cell`: the opaque cell string that can be decoded by corresponding structs
/// * `field`: used to get the corresponding TypeOption for the specified field type.
///
pub fn stringify_cell(cell: &Cell, field: &Field) -> String {
  if let Some(field_type_of_cell) = get_field_type_from_cell::<FieldType>(cell) {
    TypeOptionCellExt::new(field, None)
      .get_type_option_cell_data_handler_with_field_type(field_type_of_cell)
      .map(|handler| handler.handle_stringify_cell(cell, field))
      .unwrap_or_default()
  } else {
    "".to_string()
  }
}

pub fn insert_text_cell(s: String, field: &Field) -> Cell {
  apply_cell_changeset(BoxAny::new(s), None, field, None).unwrap()
}

pub fn insert_number_cell(num: i64, field: &Field) -> Cell {
  apply_cell_changeset(BoxAny::new(num.to_string()), None, field, None).unwrap()
}

pub fn insert_url_cell(url: String, field: &Field) -> Cell {
  // checking if url is equal to group id of no status group because everywhere
  // except group of rows with empty url the group id is equal to the url
  // so then on the case that url is equal to empty url group id we should change
  // the url to empty string
  let _no_status_group_id = make_no_status_group(field).id;
  let url = match url {
    a if a == _no_status_group_id => "".to_owned(),
    _ => url,
  };

  apply_cell_changeset(BoxAny::new(url), None, field, None).unwrap()
}

pub fn insert_checkbox_cell(is_checked: bool, field: &Field) -> Cell {
  let s = if is_checked {
    CHECK.to_string()
  } else {
    UNCHECK.to_string()
  };
  apply_cell_changeset(BoxAny::new(s), None, field, None).unwrap()
}

pub fn insert_date_cell(
  timestamp: i64,
  time: Option<String>,
  include_time: Option<bool>,
  field: &Field,
) -> Cell {
  let cell_data = DateCellChangeset {
    date: Some(timestamp),
    time,
    include_time,
    ..Default::default()
  };
  apply_cell_changeset(BoxAny::new(cell_data), None, field, None).unwrap()
}

pub fn insert_select_option_cell(option_ids: Vec<String>, field: &Field) -> Cell {
  let changeset = SelectOptionCellChangeset::from_insert_options(option_ids);
  apply_cell_changeset(BoxAny::new(changeset), None, field, None).unwrap()
}

pub fn insert_checklist_cell(insert_options: Vec<(String, bool)>, field: &Field) -> Cell {
  let changeset = ChecklistCellChangeset {
    insert_options,
    ..Default::default()
  };
  apply_cell_changeset(BoxAny::new(changeset), None, field, None).unwrap()
}

pub fn delete_select_option_cell(option_ids: Vec<String>, field: &Field) -> Cell {
  let changeset = SelectOptionCellChangeset::from_delete_options(option_ids);
  apply_cell_changeset(BoxAny::new(changeset), None, field, None).unwrap()
}

pub struct CellBuilder<'a> {
  cells: Cells,
  field_maps: HashMap<String, &'a Field>,
}

impl<'a> CellBuilder<'a> {
  /// Build list of Cells from HashMap of cell string by field id.
  pub fn with_cells(cell_by_field_id: HashMap<String, String>, fields: &'a [Field]) -> Self {
    let field_maps = fields
      .iter()
      .map(|field| (field.id.clone(), field))
      .collect::<HashMap<String, &Field>>();

    let mut cells = Cells::new();
    for (field_id, cell_str) in cell_by_field_id {
      if let Some(field) = field_maps.get(&field_id) {
        let field_type = FieldType::from(field.field_type);
        match field_type {
          FieldType::RichText => {
            cells.insert(field_id, insert_text_cell(cell_str, field));
          },
          FieldType::Number => {
            if let Ok(num) = cell_str.parse::<i64>() {
              cells.insert(field_id, insert_number_cell(num, field));
            }
          },
          FieldType::DateTime => {
            if let Ok(timestamp) = cell_str.parse::<i64>() {
              cells.insert(
                field_id,
                insert_date_cell(timestamp, None, Some(false), field),
              );
            }
          },
          FieldType::LastEditedTime | FieldType::CreatedTime => {
            tracing::warn!("Shouldn't insert cell data to cell whose field type is LastEditedTime or CreatedTime");
          },
          FieldType::SingleSelect | FieldType::MultiSelect => {
            if let Ok(ids) = SelectOptionIds::from_str(&cell_str) {
              cells.insert(field_id, insert_select_option_cell(ids.into_inner(), field));
            }
          },
          FieldType::Checkbox => {
            if let Ok(value) = CheckboxCellDataPB::from_str(&cell_str) {
              cells.insert(field_id, insert_checkbox_cell(value.is_checked, field));
            }
          },
          FieldType::URL => {
            cells.insert(field_id, insert_url_cell(cell_str, field));
          },
          FieldType::Checklist => {
            if let Ok(ids) = SelectOptionIds::from_str(&cell_str) {
              cells.insert(field_id, insert_select_option_cell(ids.into_inner(), field));
            }
          },
          FieldType::Relation => {
            cells.insert(field_id, (&RelationCellData::from(cell_str)).into());
          },
          FieldType::Summary => {
            cells.insert(field_id, insert_text_cell(cell_str, field));
          },
        }
      }
    }

    CellBuilder { cells, field_maps }
  }

  pub fn build(self) -> Cells {
    self.cells
  }

  pub fn insert_text_cell(&mut self, field_id: &str, data: String) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the text field with id: {}", field_id),
      Some(field) => {
        self
          .cells
          .insert(field_id.to_owned(), insert_text_cell(data, field));
      },
    }
  }

  pub fn insert_url_cell(&mut self, field_id: &str, data: String) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the url field with id: {}", field_id),
      Some(field) => {
        self
          .cells
          .insert(field_id.to_owned(), insert_url_cell(data, field));
      },
    }
  }

  pub fn insert_number_cell(&mut self, field_id: &str, num: i64) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the number field with id: {}", field_id),
      Some(field) => {
        self
          .cells
          .insert(field_id.to_owned(), insert_number_cell(num, field));
      },
    }
  }

  pub fn insert_checkbox_cell(&mut self, field_id: &str, is_checked: bool) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the checkbox field with id: {}", field_id),
      Some(field) => {
        self
          .cells
          .insert(field_id.to_owned(), insert_checkbox_cell(is_checked, field));
      },
    }
  }

  pub fn insert_date_cell(
    &mut self,
    field_id: &str,
    timestamp: i64,
    time: Option<String>,
    include_time: Option<bool>,
  ) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the date field with id: {}", field_id),
      Some(field) => {
        self.cells.insert(
          field_id.to_owned(),
          insert_date_cell(timestamp, time, include_time, field),
        );
      },
    }
  }

  pub fn insert_select_option_cell(&mut self, field_id: &str, option_ids: Vec<String>) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the select option field with id: {}", field_id),
      Some(field) => {
        self.cells.insert(
          field_id.to_owned(),
          insert_select_option_cell(option_ids, field),
        );
      },
    }
  }
  pub fn insert_checklist_cell(&mut self, field_id: &str, options: Vec<(String, bool)>) {
    match self.field_maps.get(&field_id.to_owned()) {
      None => tracing::warn!("Can't find the field with id: {}", field_id),
      Some(field) => {
        self
          .cells
          .insert(field_id.to_owned(), insert_checklist_cell(options, field));
      },
    }
  }
}