//! Official JP resource pull planning.

use bat_adapters::official::inventory::{
    YostarJpDownloadInventory, YostarJpPlatformDownloadInventory,
};
use bat_adapters::official::yostar_jp::{
    verified_official_platforms, PatchPlatform, YostarJpResourceDiscoveryPlan, YostarJpResourceRoot,
};
use std::collections::HashSet;

/// Full official JP pull plan, covering discovery endpoints and concrete
/// resource downloads.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct OfficialResourcePullPlan {
    /// Seed URLs and selected root from server-info.
    pub discovery: YostarJpResourceDiscoveryPlan,
    /// Concrete file inventory extracted from the catalog bytes.
    pub inventory: YostarJpPlatformDownloadInventory,
    /// Platforms that will be pulled.
    pub platforms: Vec<PatchPlatform>,
}

impl OfficialResourcePullPlan {
    /// Creates a pull plan for the requested platforms.
    pub fn new(
        discovery: YostarJpResourceDiscoveryPlan,
        inventory: YostarJpDownloadInventory,
        platforms: &[PatchPlatform],
    ) -> Self {
        Self::new_platform_inventory(
            discovery,
            YostarJpPlatformDownloadInventory::from_shared_inventory(inventory, platforms),
            platforms,
        )
    }

    /// Creates a pull plan for the requested platforms using platform-specific
    /// bundle/media catalogs.
    pub fn new_platform_inventory(
        discovery: YostarJpResourceDiscoveryPlan,
        inventory: YostarJpPlatformDownloadInventory,
        platforms: &[PatchPlatform],
    ) -> Self {
        Self {
            discovery,
            inventory,
            platforms: unique_platforms(platforms),
        }
    }

    /// Creates a pull plan for the verified official JP platforms.
    pub fn verified(
        discovery: YostarJpResourceDiscoveryPlan,
        inventory: YostarJpDownloadInventory,
    ) -> Self {
        Self::new(discovery, inventory, &verified_official_platforms())
    }

    /// Creates a pull plan for the verified official JP platforms using
    /// platform-specific bundle/media catalogs.
    pub fn verified_platform_inventory(
        discovery: YostarJpResourceDiscoveryPlan,
        inventory: YostarJpPlatformDownloadInventory,
    ) -> Self {
        Self::new_platform_inventory(discovery, inventory, &verified_official_platforms())
    }

    /// Returns all discovery URLs in server-provided order.
    pub fn discovery_urls(&self) -> Vec<String> {
        self.discovery
            .endpoints
            .iter()
            .map(|endpoint| endpoint.url.clone())
            .collect()
    }

    /// Returns the validated official resource root used by the pull plan.
    pub fn resource_root(&self) -> Result<YostarJpResourceRoot, String> {
        YostarJpResourceRoot::from_addressables_root(&self.discovery.addressables_root)
    }

    /// Returns all concrete download URLs for the selected platforms.
    pub fn content_urls(&self) -> Result<Vec<String>, String> {
        let root = self.resource_root()?;
        self.inventory
            .direct_download_urls_for_platforms(&root, &self.platforms)
    }

    /// Returns discovery URLs followed by concrete content URLs.
    pub fn all_urls(&self) -> Result<Vec<String>, String> {
        let mut urls = self.discovery_urls();
        let mut seen = urls.iter().cloned().collect::<HashSet<_>>();

        for url in self.content_urls()? {
            if seen.insert(url.clone()) {
                urls.push(url);
            }
        }

        Ok(urls)
    }
}

/// Builds a pull plan for the verified official JP platforms.
pub fn build_official_pull_plan(
    discovery: YostarJpResourceDiscoveryPlan,
    inventory: YostarJpDownloadInventory,
) -> OfficialResourcePullPlan {
    OfficialResourcePullPlan::verified(discovery, inventory)
}

/// Builds a pull plan for the verified official JP platforms using
/// platform-specific bundle/media catalogs.
pub fn build_official_pull_plan_from_platform_inventory(
    discovery: YostarJpResourceDiscoveryPlan,
    inventory: YostarJpPlatformDownloadInventory,
) -> OfficialResourcePullPlan {
    OfficialResourcePullPlan::verified_platform_inventory(discovery, inventory)
}

/// Builds a pull plan for the requested platforms.
pub fn build_official_pull_plan_for_platforms(
    discovery: YostarJpResourceDiscoveryPlan,
    inventory: YostarJpDownloadInventory,
    platforms: &[PatchPlatform],
) -> OfficialResourcePullPlan {
    OfficialResourcePullPlan::new(discovery, inventory, platforms)
}

/// Builds a pull plan for the requested platforms using platform-specific
/// bundle/media catalogs.
pub fn build_official_pull_plan_for_platform_inventory(
    discovery: YostarJpResourceDiscoveryPlan,
    inventory: YostarJpPlatformDownloadInventory,
    platforms: &[PatchPlatform],
) -> OfficialResourcePullPlan {
    OfficialResourcePullPlan::new_platform_inventory(discovery, inventory, platforms)
}

fn unique_platforms(platforms: &[PatchPlatform]) -> Vec<PatchPlatform> {
    platforms
        .iter()
        .copied()
        .fold(Vec::new(), |mut unique, platform| {
            if !unique.contains(&platform) {
                unique.push(platform);
            }
            unique
        })
}

#[cfg(test)]
mod tests {
    use super::*;
    use bat_adapters::official::inventory::{
        YostarJpDownloadInventory, YostarJpPlatformCatalogInventory,
        YostarJpPlatformDownloadInventory,
    };
    use bat_adapters::official::yostar_jp::{
        YostarJpResourceEndpoint, YostarJpResourceEndpointKind,
    };

    fn discovery_plan() -> YostarJpResourceDiscoveryPlan {
        YostarJpResourceDiscoveryPlan {
            connection_group_name: "Prod-Audit".to_string(),
            app_version: "1.70.0".to_string(),
            bundle_version: Some("s8tloc7lo3".to_string()),
            addressables_root:
                "https://prod-clientpatch.bluearchiveyostar.com/r93_token".to_string(),
            endpoints: vec![
                YostarJpResourceEndpoint {
                    kind: YostarJpResourceEndpointKind::TableCatalog,
                    platform: None,
                    url: "https://prod-clientpatch.bluearchiveyostar.com/r93_token/TableBundles/TableCatalog.bytes".to_string(),
                },
                YostarJpResourceEndpoint {
                    kind: YostarJpResourceEndpointKind::TableCatalogHash,
                    platform: None,
                    url: "https://prod-clientpatch.bluearchiveyostar.com/r93_token/TableBundles/TableCatalog.hash".to_string(),
                },
            ],
        }
    }

    fn inventory() -> YostarJpDownloadInventory {
        YostarJpDownloadInventory::from_catalog_bytes(
            b"FullPatch_000.zip",
            b"ExcelDB.db ExcelDB.db",
            b"JP_Airi.zip",
        )
    }

    fn platform_inventory() -> YostarJpPlatformDownloadInventory {
        YostarJpPlatformDownloadInventory::from_catalog_bytes(
            b"ExcelDB.db ExcelDB.db",
            vec![
                YostarJpPlatformCatalogInventory::from_catalog_bytes(
                    PatchPlatform::Windows,
                    b"FullPatch_000.zip",
                    b"JP_Airi_Win.zip",
                ),
                YostarJpPlatformCatalogInventory::from_catalog_bytes(
                    PatchPlatform::Android,
                    b"FullPatch_001.zip",
                    b"JP_Airi_Android.zip",
                ),
            ],
        )
    }

    #[test]
    fn builds_verified_pull_plan_with_all_urls() {
        let plan = build_official_pull_plan(discovery_plan(), inventory());

        assert_eq!(plan.platforms, verified_official_platforms());
        assert_eq!(plan.discovery_urls().len(), 2);

        let content_urls = plan.content_urls().unwrap();
        assert!(content_urls
            .iter()
            .any(|url| url.contains("/Windows_PatchPack/FullPatch_000.zip")));
        assert!(content_urls
            .iter()
            .any(|url| url.contains("/Android_PatchPack/FullPatch_000.zip")));
        assert_eq!(content_urls.len(), 5);

        let all_urls = plan.all_urls().unwrap();
        assert_eq!(all_urls.len(), 7);
        assert!(all_urls[0].ends_with("TableCatalog.bytes"));
        assert!(all_urls
            .iter()
            .any(|url| url.ends_with("/MediaResources-Windows/JP_Airi.zip")));
        assert_eq!(
            all_urls
                .iter()
                .filter(|url| url.ends_with("/MediaResources/JP_Airi.zip"))
                .count(),
            1
        );
    }

    #[test]
    fn deduplicates_requested_platforms() {
        let plan = build_official_pull_plan_for_platforms(
            discovery_plan(),
            inventory(),
            &[PatchPlatform::Windows, PatchPlatform::Windows],
        );

        assert_eq!(plan.platforms, vec![PatchPlatform::Windows]);
    }

    #[test]
    fn verified_pull_plan_is_windows_and_android_only() {
        let plan = build_official_pull_plan(discovery_plan(), inventory());

        assert_eq!(
            plan.platforms,
            vec![PatchPlatform::Windows, PatchPlatform::Android]
        );
    }

    #[test]
    fn builds_platform_inventory_pull_plan_without_cross_mixing_catalogs() {
        let plan = build_official_pull_plan_from_platform_inventory(
            discovery_plan(),
            platform_inventory(),
        );

        let all_urls = plan.all_urls().unwrap();

        assert_eq!(plan.platforms, verified_official_platforms());
        assert_eq!(all_urls.len(), 7);
        assert!(all_urls
            .iter()
            .any(|url| url.ends_with("/Windows_PatchPack/FullPatch_000.zip")));
        assert!(all_urls
            .iter()
            .any(|url| url.ends_with("/Android_PatchPack/FullPatch_001.zip")));
        assert!(!all_urls
            .iter()
            .any(|url| url.ends_with("/Android_PatchPack/FullPatch_000.zip")));
    }
}