use crate::db::{Dao, TenebrousDbConn};
use crate::errors::Error;
use crate::models::characters::Character;
use crate::models::proto::cofd::*;
use crate::models::users::User;
use std::collections::btree_map::{Entry, OccupiedEntry};

pub(crate) fn routes() -> Vec<rocket::Route> {
    routes![
        cofd::update_basic_info,
        cofd::update_attributes,
        cofd::update_attribute_value,
        cofd::update_skills,
        cofd::update_skill_value,
        cofd::add_condition,
        cofd::remove_condition
    ]
}

/// Load the character belonging to the given user, as long as they're
/// the owner of that character. Returns an error if user is not
/// logged in, the owner of the character is not found, or the logged
/// in user does not have the permission to access this character.
async fn load_character(
    conn: &TenebrousDbConn<'_>,
    logged_in_user: Option<&User>,
    owner: &str,
    character_id: i32,
) -> Result<Character, Error> {
    let logged_in_user = logged_in_user.ok_or(Error::NotLoggedIn)?;

    let character: Character = conn
        .load_character(character_id)
        .await?
        .ok_or(Error::NotFound)?;

    if &logged_in_user.username != owner {
        return Err(Error::NoPermission);
    }

    Ok(character)
}

/// Protobuf-based REST endpoints for editing a character.
mod cofd {
    use super::*;
    use crate::models::proto::cofd::cofd_sheet::Skill;
    use crate::models::proto::{cofd::api::*, cofd::*, Proto};

    fn find_skill_entry<'a>(
        sheet: &'a mut CofdSheet,
        skill_name: &'a str,
    ) -> Option<OccupiedEntry<'a, String, Skill>> {
        let all_skills = vec![
            &mut sheet.mental_skills,
            &mut sheet.physical_skills,
            &mut sheet.social_skills,
        ];

        // Search all skill lists for this value using "workaround" to
        // break value from for loops.
        let skill: Option<OccupiedEntry<_, _>> = 'l: loop {
            for skill_map in all_skills {
                if let Entry::Occupied(entry) = skill_map.entry(skill_name.to_owned()) {
                    break 'l Some(entry);
                }
            }

            break None;
        };

        skill
    }

    fn find_skill<'a>(sheet: &'a mut CofdSheet, skill_name: &'a str) -> Option<&'a mut Skill> {
        find_skill_entry(sheet, skill_name).map(|entry| entry.into_mut())
    }

    #[post("/cofd/<owner>/<character_id>/basic-info", data = "<info>")]
    pub(super) fn update_basic_info<'a>(
        owner: String,
        character_id: i32,
        info: Proto<BasicInfo>,
    ) -> &'a str {
        "lol"
    }

    #[post("/cofd/<owner>/<character_id>/attributes", data = "<info>")]
    pub(super) fn update_attributes<'a>(
        owner: String,
        character_id: i32,
        info: Proto<Attributes>,
    ) -> &'a str {
        "lol"
    }

    #[post("/rpc/cofd/update_attribute_value", data = "<req>")]
    pub(super) async fn update_attribute_value<'a>(
        req: Proto<UpdateAttributeRequest>,
        conn: TenebrousDbConn<'_>,
        logged_in_user: Option<&User>,
    ) -> Result<&'a str, Error> {
        let mut character = load_character(
            &conn,
            logged_in_user,
            &req.character_username,
            req.character_id,
        )
        .await?;

        let mut sheet: CofdSheet = character.try_deserialize()?;
        let value = req.attribute_value;
        match req.attribute_name.to_lowercase().as_ref() {
            "strength" => Ok(sheet.strength = value),
            "dexterity" => Ok(sheet.dexterity = value),
            "stamina" => Ok(sheet.stamina = value),
            "intelligence" => Ok(sheet.intelligence = value),
            "wits" => Ok(sheet.wits = value),
            "resolve" => Ok(sheet.resolve = value),
            "presence" => Ok(sheet.presence = value),
            "manipulation" => Ok(sheet.manipulation = value),
            "composure" => Ok(sheet.composure = value),
            _ => Err(Error::InvalidInput),
        }?;

        character.update_data(sheet)?;
        conn.update_character_sheet(&character).await?;
        Ok("lol")
    }

    #[patch(
        "/cofd/<owner>/<character_id>/skills",
        data = "<skill_update>",
        rank = 1
    )]
    pub(super) async fn update_skills<'a>(
        owner: String,
        character_id: i32,
        skill_update: Proto<SkillUpdate>,
        conn: TenebrousDbConn<'_>,
        logged_in_user: Option<&User>,
    ) -> Result<&'a str, Error> {
        let mut character = load_character(&conn, logged_in_user, &owner, character_id).await?;
        let mut sheet: CofdSheet = character.try_deserialize()?;
        let updated_skill: &Skill = skill_update.skill.as_ref().ok_or(Error::InvalidInput)?;
        let skill_entry = find_skill_entry(&mut sheet, &skill_update.name);

        skill_entry
            .map(|mut entry| entry.insert(updated_skill.clone()))
            .ok_or(Error::InvalidInput)?;

        println!(
            "updated skill {} with {:?}",
            skill_update.name, skill_update.skill
        );

        character.update_data(sheet)?;
        conn.update_character_sheet(&character).await?;
        Ok("lol")
    }

    #[post("/rpc/cofd/update_skill_value", data = "<request>")]
    pub(super) async fn update_skill_value<'a>(
        request: Proto<UpdateSkillValueRequest>,
        conn: TenebrousDbConn<'_>,
        logged_in_user: Option<&User>,
    ) -> Result<&'a str, Error> {
        println!("{:#?}", request);
        let mut character = load_character(
            &conn,
            logged_in_user,
            &request.character_username,
            request.character_id,
        )
        .await?;

        let mut sheet: CofdSheet = character.try_deserialize()?;
        let skill: Option<&mut Skill> = find_skill(&mut sheet, &request.skill_name);

        skill
            .map(|s| s.dots = request.skill_value)
            .ok_or(Error::InvalidInput)?;

        println!("updated skill value",);

        character.update_data(sheet)?;
        conn.update_character_sheet(&character).await?;
        Ok("lol")
    }

    #[put("/cofd/<owner>/<character_id>/conditions", data = "<info>")]
    pub(super) fn add_condition<'a>(
        owner: String,
        character_id: i32,
        info: Proto<Condition>,
    ) -> &'a str {
        "lol"
    }

    #[delete("/cofd/<owner>/<character_id>/conditions", data = "<info>")]
    pub(super) fn remove_condition<'a>(
        owner: String,
        character_id: i32,
        info: Proto<Condition>,
    ) -> &'a str {
        "lol"
    }
}