use serde_json::Value;

use crate::api::EmptyResult;
use crate::db::DbConn;
use crate::error::MapResult;

use super::{Organization, UserOrganization, UserOrgStatus, UserOrgType};

db_object! {
    #[derive(Identifiable, Queryable, Insertable, Associations, AsChangeset)]
    #[table_name = "org_policies"]
    #[belongs_to(Organization, foreign_key = "org_uuid")]
    #[primary_key(uuid)]
    pub struct OrgPolicy {
        pub uuid: String,
        pub org_uuid: String,
        pub atype: i32,
        pub enabled: bool,
        pub data: String,
    }
}

#[derive(Copy, Clone)]
#[derive(num_derive::FromPrimitive)]
#[derive(PartialEq)]
pub enum OrgPolicyType {
    TwoFactorAuthentication = 0,
    MasterPassword = 1,
    PasswordGenerator = 2,
    // SingleOrg = 3, // Not currently supported.
    // RequireSso = 4, // Not currently supported.
    PersonalOwnership = 5,
    DisableSend = 6,
}

/// Local methods
impl OrgPolicy {
    pub fn new(org_uuid: String, atype: OrgPolicyType, data: String) -> Self {
        Self {
            uuid: crate::util::get_uuid(),
            org_uuid,
            atype: atype as i32,
            enabled: false,
            data,
        }
    }

    pub fn has_type(&self, policy_type: OrgPolicyType) -> bool {
        self.atype == policy_type as i32
    }

    pub fn to_json(&self) -> Value {
        let data_json: Value = serde_json::from_str(&self.data).unwrap_or(Value::Null);
        json!({
            "Id": self.uuid,
            "OrganizationId": self.org_uuid,
            "Type": self.atype,
            "Data": data_json,
            "Enabled": self.enabled,
            "Object": "policy",
        })
    }
}

/// Database methods
impl OrgPolicy {
    pub fn save(&self, conn: &DbConn) -> EmptyResult {
        db_run! { conn:
            sqlite, mysql {
                match diesel::replace_into(org_policies::table)
                    .values(OrgPolicyDb::to_db(self))
                    .execute(conn)
                {
                    Ok(_) => Ok(()),
                    // Record already exists and causes a Foreign Key Violation because replace_into() wants to delete the record first.
                    Err(diesel::result::Error::DatabaseError(diesel::result::DatabaseErrorKind::ForeignKeyViolation, _)) => {
                        diesel::update(org_policies::table)
                            .filter(org_policies::uuid.eq(&self.uuid))
                            .set(OrgPolicyDb::to_db(self))
                            .execute(conn)
                            .map_res("Error saving org_policy")
                    }
                    Err(e) => Err(e.into()),
                }.map_res("Error saving org_policy")
            }
            postgresql {
                let value = OrgPolicyDb::to_db(self);
                // We need to make sure we're not going to violate the unique constraint on org_uuid and atype.
                // This happens automatically on other DBMS backends due to replace_into(). PostgreSQL does
                // not support multiple constraints on ON CONFLICT clauses.
                diesel::delete(
                    org_policies::table
                        .filter(org_policies::org_uuid.eq(&self.org_uuid))
                        .filter(org_policies::atype.eq(&self.atype)),
                )
                .execute(conn)
                .map_res("Error deleting org_policy for insert")?;

                diesel::insert_into(org_policies::table)
                    .values(&value)
                    .on_conflict(org_policies::uuid)
                    .do_update()
                    .set(&value)
                    .execute(conn)
                    .map_res("Error saving org_policy")
            }
        }
    }

    pub fn delete(self, conn: &DbConn) -> EmptyResult {
        db_run! { conn: {
            diesel::delete(org_policies::table.filter(org_policies::uuid.eq(self.uuid)))
                .execute(conn)
                .map_res("Error deleting org_policy")
        }}
    }

    pub fn find_by_uuid(uuid: &str, conn: &DbConn) -> Option<Self> {
        db_run! { conn: {
            org_policies::table
                .filter(org_policies::uuid.eq(uuid))
                .first::<OrgPolicyDb>(conn)
                .ok()
                .from_db()
        }}
    }

    pub fn find_by_org(org_uuid: &str, conn: &DbConn) -> Vec<Self> {
        db_run! { conn: {
            org_policies::table
                .filter(org_policies::org_uuid.eq(org_uuid))
                .load::<OrgPolicyDb>(conn)
                .expect("Error loading org_policy")
                .from_db()
        }}
    }

    pub fn find_by_user(user_uuid: &str, conn: &DbConn) -> Vec<Self> {
        db_run! { conn: {
            org_policies::table
                .inner_join(
                    users_organizations::table.on(
                        users_organizations::org_uuid.eq(org_policies::org_uuid)
                            .and(users_organizations::user_uuid.eq(user_uuid)))
                )
                .filter(
                    users_organizations::status.eq(UserOrgStatus::Confirmed as i32)
                )
                .select(org_policies::all_columns)
                .load::<OrgPolicyDb>(conn)
                .expect("Error loading org_policy")
                .from_db()
        }}
    }

    pub fn find_by_org_and_type(org_uuid: &str, atype: i32, conn: &DbConn) -> Option<Self> {
        db_run! { conn: {
            org_policies::table
                .filter(org_policies::org_uuid.eq(org_uuid))
                .filter(org_policies::atype.eq(atype))
                .first::<OrgPolicyDb>(conn)
                .ok()
                .from_db()
        }}
    }

    pub fn delete_all_by_organization(org_uuid: &str, conn: &DbConn) -> EmptyResult {
        db_run! { conn: {
            diesel::delete(org_policies::table.filter(org_policies::org_uuid.eq(org_uuid)))
                .execute(conn)
                .map_res("Error deleting org_policy")
        }}
    }

    /// Returns true if the user belongs to an org that has enabled the specified policy type,
    /// and the user is not an owner or admin of that org. This is only useful for checking
    /// applicability of policy types that have these particular semantics.
    pub fn is_applicable_to_user(user_uuid: &str, policy_type: OrgPolicyType, conn: &DbConn) -> bool {
        for policy in OrgPolicy::find_by_user(user_uuid, conn) { // Returns confirmed users only.
            if policy.enabled && policy.has_type(policy_type) {
                let org_uuid = &policy.org_uuid;
                if let Some(user) = UserOrganization::find_by_user_and_org(user_uuid, org_uuid, conn) {
                    if user.atype < UserOrgType::Admin {
                        return true;
                    }
                }
            }
        }
        false
    }

    /*pub fn delete_all_by_user(user_uuid: &str, conn: &DbConn) -> EmptyResult {
        db_run! { conn: {
            diesel::delete(twofactor::table.filter(twofactor::user_uuid.eq(user_uuid)))
                .execute(conn)
                .map_res("Error deleting twofactors")
        }}
    }*/
}