use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

/// Represents the status of a governance proposal
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum ProposalStatus {
    /// Proposal is in draft status, not yet open for voting
    Draft,
    /// Proposal is active and open for voting
    Active,
    /// Proposal has been approved by the community
    Approved,
    /// Proposal has been rejected by the community
    Rejected,
    /// Proposal has been cancelled by the creator
    Cancelled,
}

impl std::fmt::Display for ProposalStatus {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            ProposalStatus::Draft => write!(f, "Draft"),
            ProposalStatus::Active => write!(f, "Active"),
            ProposalStatus::Approved => write!(f, "Approved"),
            ProposalStatus::Rejected => write!(f, "Rejected"),
            ProposalStatus::Cancelled => write!(f, "Cancelled"),
        }
    }
}

/// Represents a vote on a governance proposal
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum VoteType {
    /// Vote in favor of the proposal
    Yes,
    /// Vote against the proposal
    No,
    /// Abstain from voting on the proposal
    Abstain,
}

impl std::fmt::Display for VoteType {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            VoteType::Yes => write!(f, "Yes"),
            VoteType::No => write!(f, "No"),
            VoteType::Abstain => write!(f, "Abstain"),
        }
    }
}

/// Represents a governance proposal in the system
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Proposal {
    /// Unique identifier for the proposal
    pub id: String,
    /// User ID of the proposal creator
    pub creator_id: i32,
    /// Name of the proposal creator
    pub creator_name: String,
    /// Title of the proposal
    pub title: String,
    /// Detailed description of the proposal
    pub description: String,
    /// Current status of the proposal
    pub status: ProposalStatus,
    /// Date and time when the proposal was created
    pub created_at: DateTime<Utc>,
    /// Date and time when the proposal was last updated
    pub updated_at: DateTime<Utc>,
    /// Date and time when voting starts
    pub voting_starts_at: Option<DateTime<Utc>>,
    /// Date and time when voting ends
    pub voting_ends_at: Option<DateTime<Utc>>,
}

#[allow(dead_code)]
impl Proposal {
    /// Creates a new proposal
    pub fn new(creator_id: i32, creator_name: String, title: String, description: String) -> Self {
        let now = Utc::now();
        Self {
            id: Uuid::new_v4().to_string(),
            creator_id,
            creator_name,
            title,
            description,
            status: ProposalStatus::Draft,
            created_at: now,
            updated_at: now,
            voting_starts_at: None,
            voting_ends_at: None,
        }
    }

    /// Updates the proposal status
    pub fn update_status(&mut self, status: ProposalStatus) {
        self.status = status;
        self.updated_at = Utc::now();
    }

    /// Sets the voting period for the proposal
    pub fn set_voting_period(&mut self, starts_at: DateTime<Utc>, ends_at: DateTime<Utc>) {
        self.voting_starts_at = Some(starts_at);
        self.voting_ends_at = Some(ends_at);
        self.updated_at = Utc::now();
    }

    /// Activates the proposal for voting
    pub fn activate(&mut self) {
        self.status = ProposalStatus::Active;
        self.updated_at = Utc::now();
    }

    /// Cancels the proposal
    pub fn cancel(&mut self) {
        self.status = ProposalStatus::Cancelled;
        self.updated_at = Utc::now();
    }
}

/// Represents a vote cast on a proposal
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Vote {
    /// Unique identifier for the vote
    pub id: String,
    /// ID of the proposal being voted on
    pub proposal_id: String,
    /// User ID of the voter
    pub voter_id: i32,
    /// Name of the voter
    pub voter_name: String,
    /// Type of vote cast
    pub vote_type: VoteType,
    /// Optional comment explaining the vote
    pub comment: Option<String>,
    /// Date and time when the vote was cast
    pub created_at: DateTime<Utc>,
    /// Date and time when the vote was last updated
    pub updated_at: DateTime<Utc>,
}

#[allow(dead_code)]
impl Vote {
    /// Creates a new vote
    pub fn new(
        proposal_id: String,
        voter_id: i32,
        voter_name: String,
        vote_type: VoteType,
        comment: Option<String>,
    ) -> Self {
        let now = Utc::now();
        Self {
            id: Uuid::new_v4().to_string(),
            proposal_id,
            voter_id,
            voter_name,
            vote_type,
            comment,
            created_at: now,
            updated_at: now,
        }
    }

    /// Updates the vote type
    pub fn update_vote(&mut self, vote_type: VoteType, comment: Option<String>) {
        self.vote_type = vote_type;
        self.comment = comment;
        self.updated_at = Utc::now();
    }
}

/// Represents a filter for searching proposals
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProposalFilter {
    /// Filter by proposal status
    pub status: Option<String>,
    /// Filter by creator ID
    pub creator_id: Option<i32>,
    /// Search term for title and description
    pub search: Option<String>,
}

impl Default for ProposalFilter {
    fn default() -> Self {
        Self {
            status: None,
            creator_id: None,
            search: None,
        }
    }
}

/// Represents the voting results for a proposal
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VotingResults {
    /// Proposal ID
    pub proposal_id: String,
    /// Number of yes votes
    pub yes_count: usize,
    /// Number of no votes
    pub no_count: usize,
    /// Number of abstain votes
    pub abstain_count: usize,
    /// Total number of votes
    pub total_votes: usize,
}

impl VotingResults {
    /// Creates a new VotingResults instance
    pub fn new(proposal_id: String) -> Self {
        Self {
            proposal_id,
            yes_count: 0,
            no_count: 0,
            abstain_count: 0,
            total_votes: 0,
        }
    }
}