package eu.brassepc.fitnessdroid.data

import kotlinx.serialization.Serializable
import kotlinx.serialization.json.buildJsonObject
import kotlinx.serialization.json.decodeFromJsonElement
import kotlinx.serialization.json.jsonArray
import kotlinx.serialization.json.jsonObject
import kotlinx.serialization.json.put

@Serializable
data class ActivityType(
    val id: Int,
    val key: String,
    val nameSv: String,
    val nameEn: String = "",
    val met: Double = 4.0,
    val category: String = "OTHER",
    val isDistanceBased: Boolean = false,
    val isCardio: Boolean = false,
    val iconKey: String? = null,
)

@Serializable
data class Activity(
    val id: String,
    val startedAt: String,
    val durationSeconds: Int,
    val distanceMeters: Double? = null,
    val elevationGainMeters: Double? = null,
    val estimatedKcal: Double? = null,
    val rpe: Double? = null,
    val source: String = "manual",
    val notes: String? = null,
    val activityType: ActivityType,
)

@Serializable
data class DailySummary(
    val gymKcal: Double = 0.0,
    val activityKcal: Double = 0.0,
    val activeKcal: Double = 0.0,
    val gymSessionCount: Int = 0,
    val activityCount: Int = 0,
    val distanceMeters: Double = 0.0,
    val bmrKcalPerDay: Double? = null,
    val phoneKcal: Double? = null,
    val steps: Int? = null,
)

@Serializable
data class GoalProgress(
    val id: Int,
    val metric: String,
    val period: String,
    val targetValue: Double,
    val currentValue: Double,
)

@Serializable
data class Profile(
    val username: String,
    val displayName: String? = null,
    val email: String? = null,
    val bodyWeightKg: Double? = null,
    val heightCm: Double? = null,
    val birthYear: Int? = null,
    /** "male"/"female" — serverns konvention */
    val sex: String? = null,
)

/** Autentiserade anrop mot gym-API:t. Query-strängarna speglar gymTrackerApi.js. */
class GymApi(
    private val client: GraphQlClient,
    private val auth: AuthRepository,
) {
    suspend fun myProfile(): Profile {
        // Fallback till gamla fältuppsättningen mot en äldre server.
        val data = try {
            client.execute(MY_PROFILE, token = auth.bearerToken())
        } catch (e: GraphQlException) {
            client.execute(MY_PROFILE_LEGACY, token = auth.bearerToken())
        }
        val profile = data["myProfile"]?.jsonObject
            ?: throw GraphQlException(listOf("Kunde inte hämta profilen"))
        return client.json.decodeFromJsonElement(profile)
    }

    /** Kroppsdata till servern. null = rör ej, -1/"" = rensa (serverns konvention). */
    suspend fun updateProfile(heightCm: Double?, birthYear: Int?, sex: String?): Profile {
        val data = client.execute(
            "mutation(\$h: Float,\$y: Int,\$s: String){updateProfile(heightCm:\$h,birthYear:\$y,sex:\$s){username displayName email bodyWeightKg heightCm birthYear sex}}",
            buildJsonObject {
                heightCm?.let { put("h", it) }
                birthYear?.let { put("y", it) }
                sex?.let { put("s", it) }
            },
            auth.bearerToken(),
        )
        val profile = data["updateProfile"]?.jsonObject
            ?: throw GraphQlException(listOf("Kunde inte spara kroppsdata"))
        return client.json.decodeFromJsonElement(profile)
    }

    /* ---------- Aktiviteter ---------- */

    suspend fun activityTypes(): List<ActivityType> {
        val data = client.execute(
            "query{activityTypes{id key nameSv nameEn met category isDistanceBased isCardio iconKey}}",
            token = auth.bearerToken(),
        )
        return data["activityTypes"]!!.jsonArray.map { client.json.decodeFromJsonElement<ActivityType>(it) }
    }

    suspend fun activities(limit: Int = 50): List<Activity> {
        val data = client.execute(
            "query(\$l:Int){activities(limit:\$l){$ACTIVITY_FIELDS}}",
            buildJsonObject { put("l", limit) },
            auth.bearerToken(),
        )
        return data["activities"]!!.jsonArray.map { client.json.decodeFromJsonElement<Activity>(it) }
    }

    /**
     * Logga aktivitet. Servern beräknar kcal (MET/tempo/RPE) om estimatedKcal
     * utelämnas. null = utelämna fält.
     */
    suspend fun addActivity(
        activityTypeId: Int,
        startedAtIso: String,
        durationSeconds: Int,
        distanceMeters: Double? = null,
        elevationGainMeters: Double? = null,
        rpe: Double? = null,
        estimatedKcal: Double? = null,
        source: String? = null,
        routePolyline: String? = null,
        notes: String? = null,
    ): Activity {
        val data = client.execute(
            "mutation(\$input: AddActivityInput!){addActivity(input:\$input){$ACTIVITY_FIELDS}}",
            buildJsonObject {
                put("input", buildJsonObject {
                    put("activityTypeId", activityTypeId)
                    put("startedAt", startedAtIso)
                    put("durationSeconds", durationSeconds)
                    distanceMeters?.let { put("distanceMeters", it) }
                    elevationGainMeters?.let { put("elevationGainMeters", it) }
                    rpe?.let { put("rpe", it) }
                    estimatedKcal?.let { put("estimatedKcal", it) }
                    source?.let { put("source", it) }
                    routePolyline?.let { put("routePolyline", it) }
                    notes?.let { put("notes", it) }
                })
            },
            auth.bearerToken(),
        )
        return client.json.decodeFromJsonElement(data["addActivity"]!!)
    }

    /** null = rör ej, -1/"" = rensa (serverns konvention). */
    suspend fun updateActivity(
        id: String,
        activityTypeId: Int? = null,
        startedAtIso: String? = null,
        durationSeconds: Int? = null,
        distanceMeters: Double? = null,
        elevationGainMeters: Double? = null,
        rpe: Double? = null,
        notes: String? = null,
    ): Activity {
        val data = client.execute(
            "mutation(\$input: UpdateActivityInput!){updateActivity(input:\$input){$ACTIVITY_FIELDS}}",
            buildJsonObject {
                put("input", buildJsonObject {
                    put("id", id)
                    activityTypeId?.let { put("activityTypeId", it) }
                    startedAtIso?.let { put("startedAt", it) }
                    durationSeconds?.let { put("durationSeconds", it) }
                    distanceMeters?.let { put("distanceMeters", it) }
                    elevationGainMeters?.let { put("elevationGainMeters", it) }
                    rpe?.let { put("rpe", it) }
                    notes?.let { put("notes", it) }
                })
            },
            auth.bearerToken(),
        )
        return client.json.decodeFromJsonElement(data["updateActivity"]!!)
    }

    suspend fun deleteActivity(id: String) {
        client.execute(
            "mutation(\$id: UUID!){deleteActivity(id:\$id)}",
            buildJsonObject { put("id", id) },
            auth.bearerToken(),
        )
    }

    /** Dagens sammanställning; [dayStartIso] = lokala midnatt som instant. */
    suspend fun dailySummary(dayStartIso: String): DailySummary {
        val data = client.execute(
            "query(\$d:DateTime){dailySummary(date:\$d){gymKcal activityKcal activeKcal gymSessionCount activityCount distanceMeters bmrKcalPerDay phoneKcal steps}}",
            buildJsonObject { put("d", dayStartIso) },
            auth.bearerToken(),
        )
        return client.json.decodeFromJsonElement(data["dailySummary"]!!)
    }

    /* ---------- Mål ---------- */

    /** Mål med progress; klienten skickar sina lokala periodstarter som instants. */
    suspend fun goalsWithProgress(
        dayStartIso: String,
        weekStartIso: String,
        monthStartIso: String,
    ): List<GoalProgress> {
        val data = client.execute(
            "query(\$d:DateTime!,\$w:DateTime!,\$m:DateTime!){goalsWithProgress(dayStart:\$d,weekStart:\$w,monthStart:\$m){id metric period targetValue currentValue}}",
            buildJsonObject {
                put("d", dayStartIso); put("w", weekStartIso); put("m", monthStartIso)
            },
            auth.bearerToken(),
        )
        return data["goalsWithProgress"]!!.jsonArray.map { client.json.decodeFromJsonElement<GoalProgress>(it) }
    }

    /** targetValue <= 0 tar bort målet. */
    suspend fun setGoal(metric: String, period: String, targetValue: Double) {
        client.execute(
            "mutation(\$m:String!,\$p:String!,\$t:Float!){setGoal(metric:\$m,period:\$p,targetValue:\$t)}",
            buildJsonObject { put("m", metric); put("p", period); put("t", targetValue) },
            auth.bearerToken(),
        )
    }

    companion object {
        private const val ACTIVITY_FIELDS =
            "id startedAt durationSeconds distanceMeters elevationGainMeters estimatedKcal rpe source notes " +
                "activityType{id key nameSv nameEn met category isDistanceBased isCardio iconKey}"
        private const val MY_PROFILE =
            "query{myProfile{username displayName email bodyWeightKg heightCm birthYear sex}}"
        private const val MY_PROFILE_LEGACY =
            "query{myProfile{username displayName email bodyWeightKg}}"
    }
}