//! Data models for Radio France API responses
//!
//! This module contains all the structures needed to deserialize
//! responses from Radio France's public APIs.

use serde::{Deserialize, Serialize};

// ============================================================================
// Station Discovery Models
// ============================================================================

/// A discovered Radio France station
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct Station {
    /// Unique slug identifier (e.g., "franceculture", "fip_rock")
    pub slug: String,
    /// Human-readable name (e.g., "France Culture", "FIP Rock")
    pub name: String,
    /// Type of station
    pub station_type: StationType,
}

/// Type of Radio France station
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum StationType {
    /// Main station (France Inter, France Culture, FIP, etc.)
    Main,
    /// Webradio variant of a main station
    Webradio {
        /// Parent station slug (e.g., "fip" for "fip_rock")
        parent_station: String,
    },
    /// Local France Bleu radio
    LocalRadio {
        /// Region name
        region: String,
        /// Internal Radio France ID
        id: u32,
    },
}

impl Station {
    /// Create a new main station
    pub fn main(slug: impl Into<String>, name: impl Into<String>) -> Self {
        Self {
            slug: slug.into(),
            name: name.into(),
            station_type: StationType::Main,
        }
    }

    /// Create a new webradio station
    pub fn webradio(
        slug: impl Into<String>,
        name: impl Into<String>,
        parent: impl Into<String>,
    ) -> Self {
        Self {
            slug: slug.into(),
            name: name.into(),
            station_type: StationType::Webradio {
                parent_station: parent.into(),
            },
        }
    }

    /// Create a new local radio station
    pub fn local_radio(
        slug: impl Into<String>,
        name: impl Into<String>,
        region: impl Into<String>,
        id: u32,
    ) -> Self {
        Self {
            slug: slug.into(),
            name: name.into(),
            station_type: StationType::LocalRadio {
                region: region.into(),
                id,
            },
        }
    }

    /// Check if this is a main station
    pub fn is_main(&self) -> bool {
        matches!(self.station_type, StationType::Main)
    }

    /// Check if this is a webradio
    pub fn is_webradio(&self) -> bool {
        matches!(self.station_type, StationType::Webradio { .. })
    }

    /// Check if this is a local radio
    pub fn is_local_radio(&self) -> bool {
        matches!(self.station_type, StationType::LocalRadio { .. })
    }

    /// Get the parent station for webradios, or the station itself for main stations
    pub fn base_station(&self) -> &str {
        match &self.station_type {
            StationType::Webradio { parent_station } => parent_station,
            _ => &self.slug,
        }
    }
}

// ============================================================================
// Live API Response Models
// ============================================================================

/// Response from the /api/live? endpoint
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct LiveResponse {
    /// Station name (slug)
    pub station_name: String,
    /// Recommended delay before next refresh (milliseconds)
    pub delay_to_refresh: u64,
    /// Whether station has been migrated to new system
    #[serde(default)]
    pub migrated: bool,
    /// Current show/track metadata
    pub now: ShowMetadata,
    /// Next show/track metadata (if available)
    pub next: Option<ShowMetadata>,
}

impl LiveResponse {
    /// Get local radios (France Bleu only) - convenience accessor
    pub fn local_radios(&self) -> Option<&Vec<LocalRadio>> {
        self.now.local_radios.as_ref()
    }
}

/// Metadata for a show or track currently playing
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct ShowMetadata {
    /// Whether to display music program info
    #[serde(default)]
    pub print_prog_music: bool,
    /// Start time (Unix timestamp)
    pub start_time: Option<u64>,
    /// End time (Unix timestamp)
    pub end_time: Option<u64>,
    /// Producer name
    pub producer: Option<String>,
    /// First line (usually show title)
    #[serde(default)]
    pub first_line: Line,
    /// Second line (usually episode/track title)
    #[serde(default)]
    pub second_line: Line,
    /// Third line (optional subtitle)
    pub third_line: Option<Line>,
    /// Show description/intro
    pub intro: Option<String>,
    /// React availability flag
    #[serde(default)]
    pub react_available: bool,
    /// Background visual
    pub visual_background: Option<EmbedImage>,
    /// Song info (for music stations like FIP, France Musique)
    pub song: Option<Song>,
    /// Available media streams
    #[serde(default)]
    pub media: Media,
    /// Visual assets (card, player)
    pub visuals: Option<Visuals>,
    /// Local radios list (France Bleu only)
    #[serde(default)]
    pub local_radios: Option<Vec<LocalRadio>>,
}

/// A line of text with optional link
#[derive(Debug, Clone, Default, Deserialize, Serialize)]
pub struct Line {
    /// Text content
    pub title: Option<String>,
    /// UUID of the referenced object
    pub id: Option<String>,
    /// URL path to the referenced page
    pub path: Option<String>,
}

impl Line {
    /// Get the title or an empty string
    pub fn title_or_default(&self) -> &str {
        self.title.as_deref().unwrap_or("")
    }
}

/// Song information (for music stations)
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Song {
    /// Song UUID
    pub id: String,
    /// Release year
    pub year: Option<u32>,
    /// Artist names
    #[serde(default)]
    pub interpreters: Vec<String>,
    /// Album/release information
    #[serde(default)]
    pub release: Release,
}

impl Song {
    /// Get artists as a comma-separated string
    pub fn artists_display(&self) -> String {
        self.interpreters.join(", ")
    }
}

/// Album/release information
#[derive(Debug, Clone, Default, Deserialize, Serialize)]
pub struct Release {
    /// Record label
    pub label: Option<String>,
    /// Album title
    pub title: Option<String>,
    /// Catalog reference
    pub reference: Option<String>,
}

/// Available media streams
#[derive(Debug, Clone, Default, Deserialize, Serialize)]
pub struct Media {
    /// List of available stream sources
    #[serde(default)]
    pub sources: Vec<StreamSource>,
}

impl Media {
    /// Find the best HiFi stream (AAC 192 kbps or HLS)
    pub fn best_hifi_stream(&self) -> Option<&StreamSource> {
        // Priority: AAC 192 kbps > HLS
        self.sources
            .iter()
            .find(|s| {
                s.format == StreamFormat::Aac
                    && s.broadcast_type == BroadcastType::Live
                    && s.bitrate == 192
            })
            .or_else(|| {
                self.sources.iter().find(|s| {
                    s.format == StreamFormat::Hls && s.broadcast_type == BroadcastType::Live
                })
            })
    }

    /// Find a stream by format and broadcast type
    pub fn find_stream(
        &self,
        format: StreamFormat,
        broadcast_type: BroadcastType,
    ) -> Option<&StreamSource> {
        self.sources
            .iter()
            .find(|s| s.format == format && s.broadcast_type == broadcast_type)
    }

    /// Get all live streams
    pub fn live_streams(&self) -> impl Iterator<Item = &StreamSource> {
        self.sources
            .iter()
            .filter(|s| s.broadcast_type == BroadcastType::Live)
    }
}

/// A stream source with URL and format info
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct StreamSource {
    /// Stream URL
    pub url: String,
    /// Broadcast type (live or timeshift)
    pub broadcast_type: BroadcastType,
    /// Stream format
    pub format: StreamFormat,
    /// Bitrate in kbps (0 for HLS adaptive)
    pub bitrate: u32,
}

/// Type of broadcast
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum BroadcastType {
    /// Live stream
    Live,
    /// Timeshift (replay) stream
    Timeshift,
}

/// Stream format
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum StreamFormat {
    /// MP3 format
    Mp3,
    /// AAC format
    Aac,
    /// HLS adaptive streaming
    Hls,
}

impl StreamFormat {
    /// Get the MIME type for this format
    pub fn mime_type(&self) -> &'static str {
        match self {
            StreamFormat::Mp3 => "audio/mpeg",
            StreamFormat::Aac => "audio/aac",
            StreamFormat::Hls => "application/vnd.apple.mpegurl",
        }
    }
}

/// An embedded image
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct EmbedImage {
    /// Model type (usually "EmbedImage")
    #[serde(default)]
    pub model: String,
    /// Image URL or path
    pub src: String,
    /// Image width
    pub width: Option<u32>,
    /// Image height
    pub height: Option<u32>,
    /// Dominant color (hex)
    pub dominant: Option<String>,
    /// Copyright notice
    pub copyright: Option<String>,
}

impl EmbedImage {
    /// Extract the UUID from the image URL
    ///
    /// Pikapi URLs are in format: https://www.radiofrance.fr/pikapi/images/{uuid}[/size]
    pub fn extract_uuid(&self) -> Option<String> {
        let re = regex::Regex::new(r"/pikapi/images/([a-f0-9-]+)").ok()?;
        re.captures(&self.src)
            .and_then(|cap| cap.get(1))
            .map(|m| m.as_str().to_string())
    }
}

/// Visual assets for different display contexts
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Visuals {
    /// Card-sized image
    pub card: Option<EmbedImage>,
    /// Player-sized image
    pub player: Option<EmbedImage>,
}

/// A local France Bleu radio station
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct LocalRadio {
    /// Internal ID
    pub id: u32,
    /// Display title (e.g., "ICI Alsace")
    pub title: String,
    /// Technical name (e.g., "francebleu_alsace")
    pub name: String,
    /// Whether the station is currently on air
    #[serde(default)]
    pub is_on_air: bool,
}

// ============================================================================
// Image Size Helpers
// ============================================================================

/// Available image sizes from Pikapi
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ImageSize {
    /// 88x88 pixels
    Tiny,
    /// 200x200 pixels
    Small,
    /// 420x720 pixels (portrait)
    Medium,
    /// 560x960 pixels (portrait)
    Large,
    /// 1200x680 pixels (landscape)
    XLarge,
    /// Original size
    Raw,
}

impl ImageSize {
    /// Get the size string for Pikapi URLs
    pub fn as_str(&self) -> &'static str {
        match self {
            ImageSize::Tiny => "88x88",
            ImageSize::Small => "200x200",
            ImageSize::Medium => "420x720",
            ImageSize::Large => "560x960",
            ImageSize::XLarge => "1200x680",
            ImageSize::Raw => "raw",
        }
    }

    /// Build a Pikapi image URL
    pub fn build_url(&self, uuid: &str) -> String {
        format!(
            "https://www.radiofrance.fr/pikapi/images/{}/{}",
            uuid,
            self.as_str()
        )
    }
}

// ============================================================================
// Cached Station List
// ============================================================================

/// Cached list of discovered stations with timestamp
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CachedStationList {
    /// List of discovered stations
    pub stations: Vec<Station>,
    /// Unix timestamp when the list was last updated
    pub last_updated: u64,
    /// Version of the discovery algorithm (for invalidation)
    pub version: u32,
}

impl CachedStationList {
    /// Current version of the discovery algorithm
    pub const CURRENT_VERSION: u32 = 1;

    /// Default TTL for station list cache (7 days in seconds)
    pub const DEFAULT_TTL_SECS: u64 = 7 * 24 * 3600;

    /// Create a new cached station list
    pub fn new(stations: Vec<Station>) -> Self {
        Self {
            stations,
            last_updated: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .map(|d| d.as_secs())
                .unwrap_or(0),
            version: Self::CURRENT_VERSION,
        }
    }

    /// Check if the cache is still valid
    pub fn is_valid(&self, ttl_secs: u64) -> bool {
        if self.version != Self::CURRENT_VERSION {
            return false;
        }

        let now = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_secs())
            .unwrap_or(0);

        now.saturating_sub(self.last_updated) < ttl_secs
    }

    /// Check if cache is valid with default TTL
    pub fn is_valid_default(&self) -> bool {
        self.is_valid(Self::DEFAULT_TTL_SECS)
    }

    /// Get the age of the cache in seconds
    pub fn age_secs(&self) -> u64 {
        let now = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_secs())
            .unwrap_or(0);

        now.saturating_sub(self.last_updated)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_station_creation() {
        let main = Station::main("franceculture", "France Culture");
        assert!(main.is_main());
        assert_eq!(main.base_station(), "franceculture");

        let webradio = Station::webradio("fip_rock", "FIP Rock", "fip");
        assert!(webradio.is_webradio());
        assert_eq!(webradio.base_station(), "fip");

        let local = Station::local_radio("francebleu_alsace", "ICI Alsace", "Alsace", 12);
        assert!(local.is_local_radio());
    }

    #[test]
    fn test_image_size() {
        let uuid = "436430f7-5b2b-43f2-9f3c-28f2ad6cae39";
        let url = ImageSize::Small.build_url(uuid);
        assert_eq!(
            url,
            "https://www.radiofrance.fr/pikapi/images/436430f7-5b2b-43f2-9f3c-28f2ad6cae39/200x200"
        );
    }

    #[test]
    fn test_cached_station_list_validity() {
        let stations = vec![Station::main("fip", "FIP")];
        let cached = CachedStationList::new(stations);

        assert!(cached.is_valid(3600)); // Valid for 1 hour
        assert!(cached.is_valid_default()); // Valid with default TTL
    }
}