use chrono::NaiveDateTime;
use domain::{
    errors::DomainError,
    events::DomainEvent,
    value_objects::{ExternalMetadataId, MovieId, PosterPath, Rating, ReviewId, UserId},
};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(tag = "type", content = "data")]
pub enum EventPayload {
    ReviewLogged {
        review_id: String,
        movie_id: String,
        user_id: String,
        rating: u8,
        watched_at: i64,
    },
    ReviewUpdated {
        review_id: String,
        movie_id: String,
        user_id: String,
        rating: u8,
        watched_at: i64,
    },
    MovieDiscovered {
        movie_id: String,
        external_metadata_id: String,
    },
    MovieDeleted {
        movie_id: String,
        poster_path: Option<String>,
    },
    UserUpdated {
        user_id: String,
    },
    ReviewDeleted {
        review_id: String,
        user_id: String,
    },
    MovieEnrichmentRequested {
        movie_id: String,
        external_metadata_id: String,
    },
    ImageStored {
        key: String,
    },
    WatchlistEntryAdded {
        user_id: String,
        movie_id: String,
        movie_title: String,
        release_year: u16,
        external_metadata_id: Option<String>,
        added_at: i64,
    },
    WatchlistEntryRemoved {
        user_id: String,
        movie_id: String,
    },
    FollowAccepted {
        local_user_id: String,
        remote_actor_url: String,
        outbox_url: String,
    },
    BackfillFollower {
        owner_user_id: String,
        follower_inbox_url: String,
    },
    FederationDeliveryRequested {
        inbox_url: String,
        activity_json: String,
        signing_actor_id: String,
    },
    WatchEventIngested {
        user_id: String,
        title: String,
        source: String,
    },
}

impl EventPayload {
    pub fn event_type(&self) -> &'static str {
        match self {
            EventPayload::ReviewLogged { .. } => "ReviewLogged",
            EventPayload::ReviewUpdated { .. } => "ReviewUpdated",
            EventPayload::MovieDiscovered { .. } => "MovieDiscovered",
            EventPayload::MovieDeleted { .. } => "MovieDeleted",
            EventPayload::UserUpdated { .. } => "UserUpdated",
            EventPayload::ReviewDeleted { .. } => "ReviewDeleted",
            EventPayload::MovieEnrichmentRequested { .. } => "MovieEnrichmentRequested",
            EventPayload::ImageStored { .. } => "ImageStored",
            EventPayload::WatchlistEntryAdded { .. } => "WatchlistEntryAdded",
            EventPayload::WatchlistEntryRemoved { .. } => "WatchlistEntryRemoved",
            EventPayload::FollowAccepted { .. } => "FollowAccepted",
            EventPayload::BackfillFollower { .. } => "BackfillFollower",
            EventPayload::FederationDeliveryRequested { .. } => "FederationDeliveryRequested",
            EventPayload::WatchEventIngested { .. } => "WatchEventIngested",
        }
    }
}

fn parse_uuid(s: &str, field: &str) -> Result<Uuid, DomainError> {
    Uuid::parse_str(s).map_err(|e| DomainError::InfrastructureError(format!("{field}: {e}")))
}

fn parse_ts(ts: i64) -> Result<NaiveDateTime, DomainError> {
    chrono::DateTime::from_timestamp(ts, 0)
        .map(|dt| dt.naive_utc())
        .ok_or_else(|| DomainError::InfrastructureError(format!("invalid timestamp: {ts}")))
}

impl From<&DomainEvent> for EventPayload {
    fn from(event: &DomainEvent) -> Self {
        match event {
            DomainEvent::ReviewLogged {
                review_id,
                movie_id,
                user_id,
                rating,
                watched_at,
            } => EventPayload::ReviewLogged {
                review_id: review_id.value().to_string(),
                movie_id: movie_id.value().to_string(),
                user_id: user_id.value().to_string(),
                rating: rating.value(),
                watched_at: watched_at.and_utc().timestamp(),
            },
            DomainEvent::ReviewUpdated {
                review_id,
                movie_id,
                user_id,
                rating,
                watched_at,
            } => EventPayload::ReviewUpdated {
                review_id: review_id.value().to_string(),
                movie_id: movie_id.value().to_string(),
                user_id: user_id.value().to_string(),
                rating: rating.value(),
                watched_at: watched_at.and_utc().timestamp(),
            },
            DomainEvent::MovieDiscovered {
                movie_id,
                external_metadata_id,
            } => EventPayload::MovieDiscovered {
                movie_id: movie_id.value().to_string(),
                external_metadata_id: external_metadata_id.value().to_owned(),
            },
            DomainEvent::MovieDeleted {
                movie_id,
                poster_path,
            } => EventPayload::MovieDeleted {
                movie_id: movie_id.value().to_string(),
                poster_path: poster_path.as_ref().map(|p| p.value().to_string()),
            },
            DomainEvent::UserUpdated { user_id } => EventPayload::UserUpdated {
                user_id: user_id.value().to_string(),
            },
            DomainEvent::ReviewDeleted { review_id, user_id } => EventPayload::ReviewDeleted {
                review_id: review_id.value().to_string(),
                user_id: user_id.value().to_string(),
            },
            DomainEvent::MovieEnrichmentRequested {
                movie_id,
                external_metadata_id,
            } => EventPayload::MovieEnrichmentRequested {
                movie_id: movie_id.value().to_string(),
                external_metadata_id: external_metadata_id.clone(),
            },
            DomainEvent::ImageStored { key } => EventPayload::ImageStored { key: key.clone() },
            DomainEvent::WatchlistEntryAdded {
                user_id,
                movie_id,
                movie_title,
                release_year,
                external_metadata_id,
                added_at,
            } => EventPayload::WatchlistEntryAdded {
                user_id: user_id.value().to_string(),
                movie_id: movie_id.value().to_string(),
                movie_title: movie_title.clone(),
                release_year: *release_year,
                external_metadata_id: external_metadata_id.clone(),
                added_at: added_at.and_utc().timestamp(),
            },
            DomainEvent::WatchlistEntryRemoved { user_id, movie_id } => {
                EventPayload::WatchlistEntryRemoved {
                    user_id: user_id.value().to_string(),
                    movie_id: movie_id.value().to_string(),
                }
            }
            DomainEvent::FollowAccepted {
                local_user_id,
                remote_actor_url,
                outbox_url,
            } => EventPayload::FollowAccepted {
                local_user_id: local_user_id.value().to_string(),
                remote_actor_url: remote_actor_url.clone(),
                outbox_url: outbox_url.clone(),
            },
            DomainEvent::BackfillFollower {
                owner_user_id,
                follower_inbox_url,
            } => EventPayload::BackfillFollower {
                owner_user_id: owner_user_id.value().to_string(),
                follower_inbox_url: follower_inbox_url.clone(),
            },
            DomainEvent::FederationDeliveryRequested {
                inbox_url,
                activity_json,
                signing_actor_id,
            } => EventPayload::FederationDeliveryRequested {
                inbox_url: inbox_url.clone(),
                activity_json: activity_json.clone(),
                signing_actor_id: signing_actor_id.to_string(),
            },
            DomainEvent::WatchEventIngested {
                user_id,
                title,
                source,
            } => EventPayload::WatchEventIngested {
                user_id: user_id.value().to_string(),
                title: title.clone(),
                source: source.clone(),
            },
        }
    }
}

impl TryFrom<EventPayload> for DomainEvent {
    type Error = DomainError;
    fn try_from(payload: EventPayload) -> Result<Self, DomainError> {
        match payload {
            EventPayload::ReviewLogged {
                review_id,
                movie_id,
                user_id,
                rating,
                watched_at,
            } => Ok(DomainEvent::ReviewLogged {
                review_id: ReviewId::from_uuid(parse_uuid(&review_id, "review_id")?),
                movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
                rating: Rating::new(rating)?,
                watched_at: parse_ts(watched_at)?,
            }),
            EventPayload::ReviewUpdated {
                review_id,
                movie_id,
                user_id,
                rating,
                watched_at,
            } => Ok(DomainEvent::ReviewUpdated {
                review_id: ReviewId::from_uuid(parse_uuid(&review_id, "review_id")?),
                movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
                rating: Rating::new(rating)?,
                watched_at: parse_ts(watched_at)?,
            }),
            EventPayload::MovieDiscovered {
                movie_id,
                external_metadata_id,
            } => Ok(DomainEvent::MovieDiscovered {
                movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                external_metadata_id: ExternalMetadataId::new(external_metadata_id)?,
            }),
            EventPayload::MovieDeleted {
                movie_id,
                poster_path,
            } => {
                let movie_id = MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?);
                let poster_path = poster_path
                    .map(PosterPath::new)
                    .transpose()
                    .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
                Ok(DomainEvent::MovieDeleted {
                    movie_id,
                    poster_path,
                })
            }
            EventPayload::UserUpdated { user_id } => Ok(DomainEvent::UserUpdated {
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
            }),
            EventPayload::ReviewDeleted { review_id, user_id } => Ok(DomainEvent::ReviewDeleted {
                review_id: ReviewId::from_uuid(parse_uuid(&review_id, "review_id")?),
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
            }),
            EventPayload::MovieEnrichmentRequested {
                movie_id,
                external_metadata_id,
            } => Ok(DomainEvent::MovieEnrichmentRequested {
                movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                external_metadata_id,
            }),
            EventPayload::ImageStored { key } => Ok(DomainEvent::ImageStored { key }),
            EventPayload::WatchlistEntryAdded {
                user_id,
                movie_id,
                movie_title,
                release_year,
                external_metadata_id,
                added_at,
            } => Ok(DomainEvent::WatchlistEntryAdded {
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
                movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                movie_title,
                release_year,
                external_metadata_id,
                added_at: parse_ts(added_at)?,
            }),
            EventPayload::WatchlistEntryRemoved { user_id, movie_id } => {
                Ok(DomainEvent::WatchlistEntryRemoved {
                    user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
                    movie_id: MovieId::from_uuid(parse_uuid(&movie_id, "movie_id")?),
                })
            }
            EventPayload::FollowAccepted {
                local_user_id,
                remote_actor_url,
                outbox_url,
            } => Ok(DomainEvent::FollowAccepted {
                local_user_id: UserId::from_uuid(parse_uuid(&local_user_id, "local_user_id")?),
                remote_actor_url,
                outbox_url,
            }),
            EventPayload::BackfillFollower {
                owner_user_id,
                follower_inbox_url,
            } => Ok(DomainEvent::BackfillFollower {
                owner_user_id: UserId::from_uuid(parse_uuid(&owner_user_id, "owner_user_id")?),
                follower_inbox_url,
            }),
            EventPayload::FederationDeliveryRequested {
                inbox_url,
                activity_json,
                signing_actor_id,
            } => Ok(DomainEvent::FederationDeliveryRequested {
                inbox_url,
                activity_json,
                signing_actor_id: parse_uuid(&signing_actor_id, "signing_actor_id")?,
            }),
            EventPayload::WatchEventIngested {
                user_id,
                title,
                source,
            } => Ok(DomainEvent::WatchEventIngested {
                user_id: UserId::from_uuid(parse_uuid(&user_id, "user_id")?),
                title,
                source,
            }),
        }
    }
}

#[cfg(test)]
#[path = "tests/lib.rs"]
mod tests;