use std::cmp::Ordering;
use std::str::FromStr;

use chrono::NaiveDateTime;
#[cfg(feature = "backend")]
use diesel::*;
use serde::{Deserialize, Serialize};
use uuid::Uuid;

pub use fields::*;
pub use msg::WsMsg;
pub use payloads::*;
#[cfg(feature = "backend")]
pub use sql::*;

pub mod fields;
pub mod msg;
mod payloads;

#[cfg(feature = "backend")]
pub mod sql;

pub trait ToVec {
    type Item;
    fn ordered() -> Vec<Self::Item>;
}

pub type NumberOfDeleted = usize;
pub type IssueId = i32;
pub type ProjectId = i32;
pub type ProjectName = String;
pub type UserId = i32;
pub type UserProjectId = i32;
pub type CommentId = i32;
pub type TokenId = i32;
pub type IssueStatusId = i32;
pub type IssueStatusName = String;
pub type InvitationId = i32;
pub type Position = i32;
pub type MessageId = i32;
pub type EpicId = i32;
pub type EpicName = String;

pub type EmailString = String;
pub type UsernameString = String;
pub type TitleString = String;
pub type NameString = String;
pub type AvatarUrl = String;

pub type Code = String;
pub type Lang = String;

pub type BindToken = Uuid;
pub type InvitationToken = Uuid;

macro_rules! enum_to_u32 {
    ($kind: ident, $fallback: ident, $($e: ident => $v: expr),+) => {
        #[cfg(feature = "frontend")]
        impl Into<u32> for $kind {
            fn into(self) -> u32 {
                match self {
                    $($kind :: $e => $v),+
                }
            }
        }

        #[cfg(feature = "frontend")]
        impl Into<$kind> for u32 {
            fn into(self) -> $kind {
                match self {
                    $($v => $kind :: $e),+,
                    _else => $kind :: $fallback,
                }
            }
        }
    }
}

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "IssueTypeType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum IssueType {
    Task,
    Bug,
    Story,
}

impl ToVec for IssueType {
    type Item = IssueType;

    fn ordered() -> Vec<Self> {
        use IssueType::*;
        vec![Task, Bug, Story]
    }
}

impl Default for IssueType {
    fn default() -> Self {
        IssueType::Task
    }
}

impl IssueType {
    pub fn to_label(&self) -> &str {
        use IssueType::*;
        match self {
            Task => "Task",
            Bug => "Bug",
            Story => "Story",
        }
    }
}

enum_to_u32! {
    IssueType, Task,
    Task => 1,
    Bug => 2,
    Story => 3
}

impl IssueType {
    pub fn to_str<'l>(&self) -> &'l str {
        match self {
            IssueType::Task => "task",
            IssueType::Bug => "bug",
            IssueType::Story => "story",
        }
    }
}

impl std::fmt::Display for IssueType {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.to_str())
    }
}

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "IssuePriorityType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum IssuePriority {
    Highest,
    High,
    Medium,
    Low,
    Lowest,
}

impl ToVec for IssuePriority {
    type Item = IssuePriority;

    fn ordered() -> Vec<Self> {
        vec![
            IssuePriority::Highest,
            IssuePriority::High,
            IssuePriority::Medium,
            IssuePriority::Low,
            IssuePriority::Lowest,
        ]
    }
}

impl FromStr for IssuePriority {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().trim() {
            "highest" => Ok(IssuePriority::Highest),
            "high" => Ok(IssuePriority::High),
            "medium" => Ok(IssuePriority::Medium),
            "low" => Ok(IssuePriority::Low),
            "lowest" => Ok(IssuePriority::Lowest),
            _ => Err(format!("Unknown priority {}", s)),
        }
    }
}

impl Default for IssuePriority {
    fn default() -> Self {
        IssuePriority::Medium
    }
}

impl IssuePriority {
    pub fn to_str(&self) -> &'static str {
        match self {
            IssuePriority::Highest => "highest",
            IssuePriority::High => "high",
            IssuePriority::Medium => "medium",
            IssuePriority::Low => "low",
            IssuePriority::Lowest => "lowest",
        }
    }
}

impl std::fmt::Display for IssuePriority {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.to_str())
    }
}

enum_to_u32!(
    IssuePriority, Medium,
    Highest => 5,
    High => 4,
    Medium => 3,
    Low => 2,
    Lowest => 1
);

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "UserRoleType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialEq, Hash)]
pub enum UserRole {
    User,
    Manager,
    Owner,
}

impl PartialOrd for UserRole {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        use UserRole::*;

        if self == other {
            return Some(Ordering::Equal);
        }
        let order = match (self, other) {
            (User, Manager) | (User, Owner) | (Manager, Owner) => Ordering::Less,
            _ => Ordering::Greater,
        };
        Some(order)
    }
}

impl ToVec for UserRole {
    type Item = UserRole;

    fn ordered() -> Vec<Self::Item> {
        vec![UserRole::User, UserRole::Manager, UserRole::Owner]
    }
}

impl FromStr for UserRole {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().trim() {
            "user" => Ok(UserRole::User),
            "manager" => Ok(UserRole::Manager),
            "owner" => Ok(UserRole::Owner),
            _ => Err(format!("Unknown user role {}", s)),
        }
    }
}

impl Default for UserRole {
    fn default() -> Self {
        UserRole::User
    }
}

impl UserRole {
    pub fn to_str<'l>(&self) -> &'l str {
        match self {
            UserRole::User => "user",
            UserRole::Manager => "manager",
            UserRole::Owner => "owner",
        }
    }
}

impl std::fmt::Display for UserRole {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.to_str())
    }
}

enum_to_u32!(
    UserRole, User,
    User => 0,
    Manager => 1,
    Owner => 2
);

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "ProjectCategoryType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum ProjectCategory {
    Software,
    Marketing,
    Business,
}

impl ToVec for ProjectCategory {
    type Item = ProjectCategory;

    fn ordered() -> Vec<Self> {
        vec![
            ProjectCategory::Software,
            ProjectCategory::Marketing,
            ProjectCategory::Business,
        ]
    }
}

impl FromStr for ProjectCategory {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().trim() {
            "software" => Ok(ProjectCategory::Software),
            "marketing" => Ok(ProjectCategory::Marketing),
            "business" => Ok(ProjectCategory::Business),
            _ => Err(format!("Unknown project category {}", s)),
        }
    }
}

impl Default for ProjectCategory {
    fn default() -> Self {
        ProjectCategory::Software
    }
}

impl ProjectCategory {
    pub fn to_str<'l>(&self) -> &'l str {
        match self {
            ProjectCategory::Software => "software",
            ProjectCategory::Marketing => "marketing",
            ProjectCategory::Business => "business",
        }
    }
}

impl std::fmt::Display for ProjectCategory {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.to_str())
    }
}

enum_to_u32!(
    ProjectCategory, Software,
    Software => 0,
    Marketing => 1,
    Business => 2
);

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "InvitationStateType")]
#[derive(Clone, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum InvitationState {
    Sent,
    Accepted,
    Revoked,
}

impl Default for InvitationState {
    fn default() -> Self {
        InvitationState::Sent
    }
}

impl std::fmt::Display for InvitationState {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            InvitationState::Sent => f.write_str("sent"),
            InvitationState::Accepted => f.write_str("accepted"),
            InvitationState::Revoked => f.write_str("revoked"),
        }
    }
}

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "TimeTrackingType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum TimeTracking {
    Untracked,
    Fibonacci,
    Hourly,
}

enum_to_u32!(
    TimeTracking, Untracked,
    Untracked => 0,
    Fibonacci => 1,
    Hourly => 2
);

#[derive(Clone, Serialize, Debug, PartialEq)]
pub struct ErrorResponse {
    pub errors: Vec<String>,
}

impl ErrorResponse {
    pub fn single<S: Into<String>>(err: S) -> Self {
        Self {
            errors: vec![err.into()],
        }
    }
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Serialize, Deserialize, Debug, PartialEq)]
pub struct Project {
    pub id: ProjectId,
    pub name: String,
    pub url: String,
    pub description: String,
    pub category: ProjectCategory,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
    pub time_tracking: TimeTracking,
}

#[derive(Clone, Serialize, Deserialize, Debug, PartialEq)]
pub struct Issue {
    pub id: IssueId,
    pub title: String,
    pub issue_type: IssueType,
    pub priority: IssuePriority,
    pub list_position: i32,
    pub description: Option<String>,
    pub description_text: Option<String>,
    pub estimate: Option<i32>,
    pub time_spent: Option<i32>,
    pub time_remaining: Option<i32>,
    pub reporter_id: UserId,
    pub project_id: ProjectId,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
    pub issue_status_id: IssueStatusId,
    pub epic_id: Option<EpicId>,

    pub user_ids: Vec<i32>,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Serialize, Deserialize, Debug, PartialEq)]
pub struct IssueStatus {
    pub id: IssueStatusId,
    pub name: String,
    pub position: ProjectId,
    pub project_id: ProjectId,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Invitation {
    pub id: i32,
    pub name: String,
    pub email: String,
    pub state: InvitationState,
    pub project_id: i32,
    pub invited_by_id: i32,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
    pub bind_token: Uuid,
    pub role: UserRole,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Comment {
    pub id: CommentId,
    pub body: String,
    pub user_id: UserId,
    pub issue_id: IssueId,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct User {
    pub id: UserId,
    pub name: String,
    pub email: String,
    pub avatar_url: Option<String>,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct UserProject {
    pub id: UserProjectId,
    pub user_id: UserId,
    pub project_id: ProjectId,
    pub is_default: bool,
    pub is_current: bool,
    pub role: UserRole,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Token {
    pub id: TokenId,
    pub user_id: UserId,
    pub access_token: Uuid,
    pub refresh_token: Uuid,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
    pub bind_token: Option<Uuid>,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct IssueAssignee {
    pub id: i32,
    pub issue_id: IssueId,
    pub user_id: UserId,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(FromSqlRow, AsExpression))]
#[cfg_attr(feature = "backend", sql_type = "MessageTypeType")]
#[derive(Clone, Copy, Deserialize, Serialize, Debug, PartialOrd, PartialEq, Hash)]
pub enum MessageType {
    ReceivedInvitation,
    AssignedToIssue,
    Mention,
}

enum_to_u32!(
    MessageType, Mention,
    ReceivedInvitation => 0,
    AssignedToIssue => 1,
    Mention => 2
);

impl std::fmt::Display for MessageType {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            MessageType::ReceivedInvitation => f.write_str("ReceivedInvitation"),
            MessageType::AssignedToIssue => f.write_str("AssignedToIssue"),
            MessageType::Mention => f.write_str("Mention"),
        }
    }
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Message {
    pub id: MessageId,
    pub receiver_id: UserId,
    pub sender_id: UserId,
    pub summary: String,
    pub description: String,
    pub message_type: MessageType,
    pub hyper_link: String,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
}

#[cfg_attr(feature = "backend", derive(Queryable))]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Epic {
    pub id: EpicId,
    pub name: NameString,
    pub user_id: UserId,
    pub project_id: ProjectId,
    pub created_at: NaiveDateTime,
    pub updated_at: NaiveDateTime,
    pub starts_at: Option<NaiveDateTime>,
    pub ends_at: Option<NaiveDateTime>,
}

pub type FontStyle = u8;

pub static BOLD: FontStyle = 1;
pub static UNDERLINE: FontStyle = 2;
pub static ITALIC: FontStyle = 4;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub struct Color {
    /// Red component
    pub r: u8,
    /// Green component
    pub g: u8,
    /// Blue component
    pub b: u8,
    /// Alpha (transparency) component
    pub a: u8,
}

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct Style {
    /// Foreground color
    pub foreground: Color,
    /// Background color
    pub background: Color,
    /// Style of the font
    pub font_style: FontStyle,
}

#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct HighlightedCode {
    pub parts: Vec<(Style, String)>,
}