//! Mock implementation of [`Prompter`] for testing
//!
//! This module is gated via `#[cfg(any(test, feature = "test-utils"))]` on its
//! declaration in `mod.rs`, so it is never compiled into production binaries.
//!
//! [`Prompter`]: super::prompter::Prompter

use std::sync::{Arc, Mutex};

use crate::{
    commit::types::{BreakingChange, CommitType, Description, Scope},
    error::Error,
    prompts::prompter::Prompter,
};

/// Enum representing different types of mock responses
#[derive(Debug)]
enum MockResponse {
    CommitType(CommitType),
    Scope(Scope),
    Description(Description),
    BreakingChange(BreakingChange),
    Confirm(bool),
    Error(Error),
}

/// Mock implementation of [`Prompter`] for testing
///
/// This struct allows configuring responses for each prompt type and tracks
/// which prompts were called during test execution.
#[derive(Debug, Default, Clone)]
pub struct MockPrompts {
    /// Queue of responses to return for each prompt call
    responses: Arc<Mutex<Vec<MockResponse>>>,
    /// Track which prompts were called (for verification)
    prompts_called: Arc<Mutex<Vec<String>>>,
    /// Messages emitted via emit_message() for test assertion
    messages: Arc<Mutex<Vec<String>>>,
}

impl MockPrompts {
    /// Create a new MockPrompts with empty response queue
    pub fn new() -> Self {
        Self::default()
    }

    /// Configure the mock to return a specific commit type
    pub fn with_commit_type(self, commit_type: CommitType) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::CommitType(commit_type));
        self
    }

    /// Configure the mock to return a specific scope
    pub fn with_scope(self, scope: Scope) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::Scope(scope));
        self
    }

    /// Configure the mock to return a specific description
    pub fn with_description(self, description: Description) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::Description(description));
        self
    }

    /// Configure the mock to return a specific breaking change response
    pub fn with_breaking_change(self, breaking_change: BreakingChange) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::BreakingChange(breaking_change));
        self
    }

    /// Configure the mock to return a specific confirmation response
    pub fn with_confirm(self, confirm: bool) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::Confirm(confirm));
        self
    }

    /// Configure the mock to return an error
    pub fn with_error(self, error: Error) -> Self {
        self.responses
            .lock()
            .unwrap()
            .push(MockResponse::Error(error));
        self
    }

    /// Check if select_commit_type was called
    pub fn was_commit_type_called(&self) -> bool {
        self.prompts_called
            .lock()
            .unwrap()
            .contains(&"select_commit_type".to_string())
    }

    /// Check if input_scope was called
    pub fn was_scope_called(&self) -> bool {
        self.prompts_called
            .lock()
            .unwrap()
            .contains(&"input_scope".to_string())
    }

    /// Check if input_description was called
    pub fn was_description_called(&self) -> bool {
        self.prompts_called
            .lock()
            .unwrap()
            .contains(&"input_description".to_string())
    }

    /// Check if input_breaking_change was called
    pub fn was_breaking_change_called(&self) -> bool {
        self.prompts_called
            .lock()
            .unwrap()
            .contains(&"input_breaking_change".to_string())
    }

    /// Check if confirm_apply was called
    pub fn was_confirm_called(&self) -> bool {
        self.prompts_called
            .lock()
            .unwrap()
            .contains(&"confirm_apply".to_string())
    }

    /// Get all messages emitted via emit_message()
    pub fn emitted_messages(&self) -> Vec<String> {
        self.messages.lock().unwrap().clone()
    }
}

impl Prompter for MockPrompts {
    fn select_commit_type(&self) -> Result<CommitType, Error> {
        self.prompts_called
            .lock()
            .unwrap()
            .push("select_commit_type".to_string());

        match self.responses.lock().unwrap().remove(0) {
            MockResponse::CommitType(ct) => Ok(ct),
            MockResponse::Error(e) => Err(e),
            _ => panic!("MockPrompts: Expected CommitType response, got different type"),
        }
    }

    fn input_scope(&self) -> Result<Scope, Error> {
        self.prompts_called
            .lock()
            .unwrap()
            .push("input_scope".to_string());

        match self.responses.lock().unwrap().remove(0) {
            MockResponse::Scope(scope) => Ok(scope),
            MockResponse::Error(e) => Err(e),
            _ => panic!("MockPrompts: Expected Scope response, got different type"),
        }
    }

    fn input_description(&self) -> Result<Description, Error> {
        self.prompts_called
            .lock()
            .unwrap()
            .push("input_description".to_string());

        match self.responses.lock().unwrap().remove(0) {
            MockResponse::Description(desc) => Ok(desc),
            MockResponse::Error(e) => Err(e),
            _ => panic!("MockPrompts: Expected Description response, got different type"),
        }
    }

    fn input_breaking_change(&self) -> Result<BreakingChange, Error> {
        self.prompts_called
            .lock()
            .unwrap()
            .push("input_breaking_change".to_string());

        match self.responses.lock().unwrap().remove(0) {
            MockResponse::BreakingChange(bc) => Ok(bc),
            MockResponse::Error(e) => Err(e),
            _ => panic!("MockPrompts: Expected BreakingChange response, got different type"),
        }
    }

    fn confirm_apply(&self, _message: &str) -> Result<bool, Error> {
        self.prompts_called
            .lock()
            .unwrap()
            .push("confirm_apply".to_string());

        match self.responses.lock().unwrap().remove(0) {
            MockResponse::Confirm(confirm) => Ok(confirm),
            MockResponse::Error(e) => Err(e),
            _ => panic!("MockPrompts: Expected Confirm response, got different type"),
        }
    }

    fn emit_message(&self, msg: &str) {
        self.messages.lock().unwrap().push(msg.to_string());
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::commit::types::{CommitType, Description, Scope};

    #[test]
    fn mock_prompts_creation() {
        let mock = MockPrompts::new();
        assert!(matches!(mock, MockPrompts { .. }));
    }

    #[test]
    fn mock_prompts_implements_trait() {
        let mock = MockPrompts::new();
        fn _accepts_prompter(_p: impl Prompter) {}
        _accepts_prompter(mock);
    }

    #[test]
    fn mock_select_commit_type() {
        let mock = MockPrompts::new().with_commit_type(CommitType::Feat);
        let result = mock.select_commit_type();
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), CommitType::Feat);
        assert!(mock.was_commit_type_called());
    }

    #[test]
    fn mock_input_scope() {
        let scope = Scope::parse("test-scope").unwrap();
        let mock = MockPrompts::new().with_scope(scope.clone());
        let result = mock.input_scope();
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), scope);
        assert!(mock.was_scope_called());
    }

    #[test]
    fn mock_input_description() {
        let desc = Description::parse("test description").unwrap();
        let mock = MockPrompts::new().with_description(desc.clone());
        let result = mock.input_description();
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), desc);
        assert!(mock.was_description_called());
    }

    #[test]
    fn mock_confirm_apply() {
        let mock = MockPrompts::new().with_confirm(true);
        let result = mock.confirm_apply("test message");
        assert!(result.is_ok());
        assert!(result.unwrap());
        assert!(mock.was_confirm_called());
    }

    #[test]
    fn mock_error_response() {
        let mock = MockPrompts::new().with_error(Error::Cancelled);
        let result = mock.select_commit_type();
        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), Error::Cancelled));
    }

    #[test]
    fn mock_tracks_prompt_calls() {
        let mock = MockPrompts::new()
            .with_commit_type(CommitType::Fix)
            .with_scope(Scope::empty())
            .with_description(Description::parse("test").unwrap())
            .with_confirm(true);

        mock.select_commit_type().unwrap();
        mock.input_scope().unwrap();
        mock.input_description().unwrap();
        mock.confirm_apply("test").unwrap();

        assert!(mock.was_commit_type_called());
        assert!(mock.was_scope_called());
        assert!(mock.was_description_called());
        assert!(mock.was_confirm_called());
    }

    #[test]
    fn mock_emit_message_records_messages() {
        let mock = MockPrompts::new();
        mock.emit_message("hello");
        mock.emit_message("world");
        let msgs = mock.emitted_messages();
        assert_eq!(msgs, vec!["hello", "world"]);
    }

    #[test]
    fn mock_emit_message_starts_empty() {
        let mock = MockPrompts::new();
        assert!(mock.emitted_messages().is_empty());
    }

    #[test]
    fn mock_input_breaking_change_no() {
        let mock = MockPrompts::new().with_breaking_change(BreakingChange::No);
        let result = mock.input_breaking_change();
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), BreakingChange::No);
        assert!(mock.was_breaking_change_called());
    }

    #[test]
    fn mock_input_breaking_change_yes_no_note() {
        let mock = MockPrompts::new().with_breaking_change(BreakingChange::Yes);
        let result = mock.input_breaking_change();
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), BreakingChange::Yes);
        assert!(mock.was_breaking_change_called());
    }

    #[test]
    fn mock_input_breaking_change_yes_with_note() {
        let mock = MockPrompts::new().with_breaking_change("removes old API".into());
        let result = mock.input_breaking_change();
        assert!(result.is_ok());
        assert_eq!(
            result.unwrap(),
            BreakingChange::WithNote("removes old API".into())
        );
        assert!(mock.was_breaking_change_called());
    }

    #[test]
    fn mock_input_breaking_change_error() {
        let mock = MockPrompts::new().with_error(Error::Cancelled);
        let result = mock.input_breaking_change();
        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), Error::Cancelled));
    }

    #[test]
    fn mock_tracks_breaking_change_call() {
        let mock = MockPrompts::new()
            .with_commit_type(CommitType::Fix)
            .with_scope(Scope::empty())
            .with_description(Description::parse("test").unwrap())
            .with_breaking_change(BreakingChange::No)
            .with_confirm(true);

        mock.select_commit_type().unwrap();
        mock.input_scope().unwrap();
        mock.input_description().unwrap();
        mock.input_breaking_change().unwrap();
        mock.confirm_apply("test").unwrap();

        assert!(mock.was_commit_type_called());
        assert!(mock.was_scope_called());
        assert!(mock.was_description_called());
        assert!(mock.was_breaking_change_called());
        assert!(mock.was_confirm_called());
    }
}