// heromodels/src/models/governance/proposal.rs

use chrono::{DateTime, Utc};
use heromodels_derive::model; // For #[model]
use rhai::{CustomType, TypeBuilder};
use serde::{Deserialize, Serialize};

use super::AttachedFile;
use crate::models::core::Comment;
use heromodels_core::BaseModelData;

// --- Enums ---

/// ProposalStatus defines the lifecycle status of a governance proposal itself
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum ProposalStatus {
    Draft,     // Proposal is being prepared
    Active,    // Proposal is active
    Approved,  // Proposal has been formally approved
    Rejected,  // Proposal has been formally rejected
    Cancelled, // Proposal was cancelled
}

impl Default for ProposalStatus {
    fn default() -> Self {
        ProposalStatus::Draft
    }
}

/// VoteEventStatus represents the status of the voting process for a proposal
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum VoteEventStatus {
    Upcoming,  // Voting is scheduled but not yet open
    Open,      // Voting is currently open
    Closed,    // Voting has finished
    Cancelled, // The voting event was cancelled
}

impl Default for VoteEventStatus {
    fn default() -> Self {
        VoteEventStatus::Upcoming
    }
}

// --- Structs ---

/// VoteOption represents a specific choice that can be voted on
#[derive(Debug, Clone, Serialize, Deserialize, CustomType, Default)]
pub struct VoteOption {
    pub id: u8,                  // Simple identifier for this option
    pub text: String,            // Descriptive text of the option
    pub count: i64,              // How many votes this option has received
    pub min_valid: Option<i64>,  // Optional: minimum votes needed,
    pub comment: Option<String>, // Optional: comment
}

impl VoteOption {
    pub fn new(id: u8, text: impl ToString, comment: Option<impl ToString>) -> Self {
        Self {
            id,
            text: text.to_string(),
            count: 0,
            min_valid: None,
            comment: comment.map(|c| c.to_string()),
        }
    }
}

/// Ballot represents an individual vote cast by a user
#[derive(Debug, Clone, Serialize, Deserialize, CustomType, Default)]
// Removed rhai_model_export macro as it's causing compilation errors
#[model] // Has base.Base in V spec
pub struct Ballot {
    pub base_data: BaseModelData,
    pub user_id: u32,            // The ID of the user who cast this ballot
    pub vote_option_id: u8,      // The 'id' of the VoteOption chosen
    pub shares_count: i64,       // Number of shares/tokens/voting power
    pub comment: Option<String>, // Optional comment from the voter
}

impl Ballot {
    /// Create a new ballot with auto-generated ID
    ///
    /// # Arguments
    /// * `id` - Optional ID for the ballot (use None for auto-generated ID)
    /// * `user_id` - ID of the user who cast this ballot
    /// * `vote_option_id` - ID of the vote option chosen
    /// * `shares_count` - Number of shares/tokens/voting power
    pub fn new(id: Option<u32>, user_id: u32, vote_option_id: u8, shares_count: i64) -> Self {
        let mut base_data = BaseModelData::new();
        if let Some(id) = id {
            base_data.update_id(id);
        }

        Self {
            base_data,
            user_id,
            vote_option_id,
            shares_count,
            comment: None,
        }
    }
}

/// Proposal represents a governance proposal that can be voted upon.
#[derive(Debug, Clone, Serialize, Deserialize, CustomType)]
// Removed rhai_model_export macro as it's causing compilation errors
#[model] // Has base.Base in V spec
pub struct Proposal {
    pub base_data: BaseModelData,
    pub creator_id: String,   // User ID of the proposal creator
    pub creator_name: String, // User name of the proposal creator

    pub title: String,
    pub description: String,
    pub status: ProposalStatus,

    // Voting event aspects
    pub vote_start_date: DateTime<Utc>,
    pub vote_end_date: DateTime<Utc>,
    pub vote_status: VoteEventStatus,
    pub options: Vec<VoteOption>,
    pub ballots: Vec<Ballot>, // This will store actual Ballot structs
    pub private_group: Option<Vec<u32>>, // Optional list of eligible user IDs

    pub tags: Vec<String>,
    pub comments: Vec<Comment>,
    pub attached_files: Vec<AttachedFile>,
    pub urgency_score: Option<f32>,
}

impl Default for Proposal {
    fn default() -> Self {
        Self {
            base_data: BaseModelData::new(),
            creator_id: "".to_string(),
            creator_name: String::new(), // Added missing field
            title: "".to_string(),
            description: "".to_string(),
            status: ProposalStatus::Draft,
            // created_at and updated_at are now in base_data
            vote_start_date: Utc::now(),
            vote_end_date: Utc::now(),
            vote_status: VoteEventStatus::Upcoming,
            options: vec![],
            ballots: vec![],
            private_group: None,
            tags: vec![],
            comments: vec![],
            attached_files: vec![],
            urgency_score: None,
        }
    }
}

impl Proposal {
    /// Create a new proposal with auto-generated ID
    ///
    /// # Arguments
    /// * `id` - Optional ID for the proposal (use None for auto-generated ID)
    /// * `creator_id` - ID of the user who created the proposal
    /// * `title` - Title of the proposal
    /// * `description` - Description of the proposal
    /// * `vote_start_date` - Date when voting starts
    /// * `vote_end_date` - Date when voting ends
    pub fn new(
        id: Option<u32>,
        creator_id: impl ToString,
        creator_name: impl ToString,
        title: impl ToString,
        description: impl ToString,
        status: ProposalStatus,
        tags: Vec<String>,
        urgency_score: Option<f32>,
    ) -> Self {
        let mut base_data = BaseModelData::new();
        if let Some(id) = id {
            base_data.update_id(id);
        }

        Self {
            base_data,
            creator_id: creator_id.to_string(),
            creator_name: creator_name.to_string(),
            title: title.to_string(),
            description: description.to_string(),
            status,
            vote_start_date: Utc::now(),
            vote_end_date: Utc::now(),
            vote_status: VoteEventStatus::Upcoming,
            options: Vec::new(),
            ballots: Vec::new(),
            private_group: None,
            tags,
            comments: Vec::new(),
            attached_files: Vec::new(),
            urgency_score,
        }
    }

    pub fn add_option(
        mut self,
        option_id: u8,
        option_text: impl ToString,
        comment: Option<impl ToString>,
    ) -> Self {
        let new_option = VoteOption::new(option_id, option_text, comment);
        self.options.push(new_option);
        self
    }

    pub fn cast_vote(
        mut self,
        ballot_id: Option<u32>,
        user_id: u32,
        chosen_option_id: u8,
        shares: i64,
    ) -> Self {
        if self.vote_status != VoteEventStatus::Open {
            eprintln!("Voting is not open for proposal '{}'", self.title);
            return self;
        }
        if !self.options.iter().any(|opt| opt.id == chosen_option_id) {
            eprintln!(
                "Chosen option ID {} does not exist for proposal '{}'",
                chosen_option_id, self.title
            );
            return self;
        }
        if let Some(group) = &self.private_group {
            if !group.contains(&user_id) {
                eprintln!(
                    "User {} is not eligible to vote on proposal '{}'",
                    user_id, self.title
                );
                return self;
            }
        }

        let new_ballot = Ballot::new(ballot_id, user_id, chosen_option_id, shares);
        self.ballots.push(new_ballot);

        if let Some(option) = self
            .options
            .iter_mut()
            .find(|opt| opt.id == chosen_option_id)
        {
            option.count += shares;
        }
        self
    }

    pub fn change_proposal_status(mut self, new_status: ProposalStatus) -> Self {
        self.status = new_status;
        self
    }

    pub fn change_vote_event_status(mut self, new_status: VoteEventStatus) -> Self {
        self.vote_status = new_status;
        self
    }

    /// Cast a vote with a comment
    ///
    /// # Arguments
    /// * `ballot_id` - Optional ID for the ballot (use None for auto-generated ID)
    /// * `user_id` - ID of the user who is casting the vote
    /// * `chosen_option_id` - ID of the vote option chosen
    /// * `shares` - Number of shares/tokens/voting power
    /// * `comment` - Comment from the voter explaining their vote
    pub fn cast_vote_with_comment(
        mut self,
        ballot_id: Option<u32>,
        user_id: u32,
        chosen_option_id: u8,
        shares: i64,
        comment: impl ToString,
    ) -> Self {
        // First check if voting is open
        if self.vote_status != VoteEventStatus::Open {
            eprintln!("Voting is not open for proposal '{}'", self.title);
            return self;
        }

        // Check if the option exists
        if !self.options.iter().any(|opt| opt.id == chosen_option_id) {
            eprintln!(
                "Chosen option ID {} does not exist for proposal '{}'",
                chosen_option_id, self.title
            );
            return self;
        }

        // Check eligibility for private proposals
        if let Some(group) = &self.private_group {
            if !group.contains(&user_id) {
                eprintln!(
                    "User {} is not eligible to vote on proposal '{}'",
                    user_id, self.title
                );
                return self;
            }
        }

        // Create a new ballot with the comment
        let mut new_ballot = Ballot::new(ballot_id, user_id, chosen_option_id, shares);
        new_ballot.comment = Some(comment.to_string());

        // Add the ballot to the proposal
        self.ballots.push(new_ballot);

        // Update the vote count for the chosen option
        if let Some(option) = self
            .options
            .iter_mut()
            .find(|opt| opt.id == chosen_option_id)
        {
            option.count += shares;
        }

        self
    }
}

pub enum ActivityType {
    ProposalCreated,
    VoteCast,
    VotingStarted,
    VotingEnded,
}

impl ToString for ActivityType {
    fn to_string(&self) -> String {
        match self {
            ActivityType::ProposalCreated => "proposal_created",
            ActivityType::VoteCast => "vote_cast",
            ActivityType::VotingStarted => "voting_started",
            ActivityType::VotingEnded => "voting_ended",
        }
        .to_string()
    }
}

/// Represents a governance activity in the system
#[derive(Debug, Clone, Serialize, Deserialize, CustomType)]
#[rhai_model_export(db_type = "std::sync::Arc<crate::db::hero::OurDB>")]
#[model] // Has base.Base in V spec
pub struct Activity {
    /// Base model data
    pub base_data: BaseModelData,
    /// Type of activity (proposal_created, vote_cast, etc.)
    pub activity_type: String,
    /// ID of the related proposal
    pub proposal_id: u32,
    /// Title of the related proposal
    pub proposal_title: String,
    /// Name of the user who performed the action
    pub creator_name: String,
    /// Description of the activity
    pub description: String,
    /// Date and time when the activity was last updated
    pub updated_at: DateTime<Utc>,
    /// Date and time when the activity was created
    pub created_at: DateTime<Utc>,
}

impl Activity {
    /// Create a default instance
    pub fn default() -> Self {
        let base_data = BaseModelData::new();
        let created_at = Utc::now();
        let updated_at = created_at;

        Self {
            base_data,
            activity_type: String::new(),
            proposal_id: 0,
            proposal_title: String::new(),
            creator_name: String::new(),
            description: String::new(),
            updated_at,
            created_at,
        }
    }

    /// Creates a new governance activity
    pub fn new(
        id: Option<u32>,
        activity_type: &str,
        proposal_id: u32,
        proposal_title: &str,
        creator_name: &str,
        description: &str,
    ) -> Self {
        let mut base_data = BaseModelData::new();
        if let Some(id) = id {
            base_data.update_id(id);
        }

        let created_at = Utc::now();
        let updated_at = created_at;

        Self {
            base_data,
            activity_type: activity_type.to_string(),
            proposal_id,
            proposal_title: proposal_title.to_string(),
            creator_name: creator_name.to_string(),
            description: description.to_string(),
            updated_at,
            created_at,
        }
    }

    /// Creates a proposal creation activity
    pub fn proposal_created(proposal_id: u32, proposal_title: &str, creator_name: &str) -> Self {
        Self::new(
            None,
            &ActivityType::ProposalCreated.to_string(),
            proposal_id,
            proposal_title,
            creator_name,
            &format!("Proposal '{}' created by {}", proposal_title, creator_name),
        )
    }

    /// Creates a vote cast activity
    pub fn vote_cast(proposal_id: u32, proposal_title: &str, voter_name: &str) -> Self {
        Self::new(
            None,
            &ActivityType::VoteCast.to_string(),
            proposal_id,
            proposal_title,
            voter_name,
            &format!("{} voted on proposal '{}'", voter_name, proposal_title),
        )
    }

    // Create voting start activity
    pub fn voting_started(proposal_id: u32, proposal_title: &str) -> Self {
        Self::new(
            None,
            &ActivityType::VotingStarted.to_string(),
            proposal_id,
            proposal_title,
            "System",
            &format!("Voting started for proposal '{}'", proposal_title),
        )
    }

    // Create voting ended activity
    pub fn voting_ended(proposal_id: u32, proposal_title: &str) -> Self {
        Self::new(
            None,
            &ActivityType::VotingEnded.to_string(),
            proposal_id,
            proposal_title,
            "System",
            &format!("Voting ended for proposal '{}'", proposal_title),
        )
    }
}