CREATE TABLE activities (
    id                         INTEGER PRIMARY KEY AUTOINCREMENT,
    garmin_activity_id         INTEGER NOT NULL UNIQUE,
    activity_name              TEXT NOT NULL DEFAULT '',
    activity_type              TEXT NOT NULL,
    start_time_utc             TEXT NOT NULL,
    begin_timestamp_ms         INTEGER NOT NULL,
    duration_seconds           REAL NOT NULL,
    distance_meters            REAL NOT NULL,
    avg_hr                     REAL,
    max_hr                     REAL,
    avg_speed_mps              REAL,
    max_speed_mps              REAL,
    elevation_gain_m           REAL,
    elevation_loss_m           REAL,
    calories                   REAL,
    lap_count                  INTEGER NOT NULL DEFAULT 0,
    aerobic_training_effect    REAL,
    anaerobic_training_effect  REAL,
    training_effect_label      TEXT NOT NULL DEFAULT '',
    vo2max_value               REAL,
    hr_time_in_zone_1          REAL,
    hr_time_in_zone_2          REAL,
    hr_time_in_zone_3          REAL,
    hr_time_in_zone_4          REAL,
    hr_time_in_zone_5          REAL,
    raw_json                   TEXT NOT NULL,
    details_fetched_at         TEXT,
    details_raw_json           TEXT,
    splits_fetched_at          TEXT,
    created_at                 TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at                 TEXT NOT NULL DEFAULT (datetime('now'))
);
CREATE INDEX idx_activities_start_time ON activities(start_time_utc);
CREATE INDEX idx_activities_activity_type ON activities(activity_type);

CREATE TABLE laps (
    id                     INTEGER PRIMARY KEY AUTOINCREMENT,
    activity_id            INTEGER NOT NULL REFERENCES activities(id) ON DELETE CASCADE,
    lap_index              INTEGER NOT NULL,
    start_time_utc         TEXT NOT NULL,
    duration_seconds       REAL NOT NULL,
    distance_meters        REAL NOT NULL,
    avg_hr                 REAL,
    max_hr                 REAL,
    avg_speed_mps          REAL,
    max_speed_mps          REAL,
    elevation_gain_m       REAL,
    elevation_loss_m       REAL,
    intensity_type         TEXT NOT NULL DEFAULT '',
    hr_drift_bpm_per_min   REAL,
    hr_recovery_bpm_per_min REAL,
    raw_json               TEXT NOT NULL,
    UNIQUE(activity_id, lap_index)
);

CREATE TABLE activity_samples (
    id              INTEGER PRIMARY KEY AUTOINCREMENT,
    activity_id     INTEGER NOT NULL REFERENCES activities(id) ON DELETE CASCADE,
    elapsed_seconds REAL NOT NULL,
    timestamp_ms    INTEGER NOT NULL,
    heart_rate      REAL,
    speed_mps       REAL,
    distance_m      REAL,
    elevation_m     REAL
);
CREATE INDEX idx_activity_samples_activity ON activity_samples(activity_id, elapsed_seconds);

CREATE TABLE workout_kinds (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    name        TEXT NOT NULL UNIQUE,
    description TEXT NOT NULL DEFAULT '',
    color       TEXT NOT NULL DEFAULT '',
    rule_json   TEXT NOT NULL,
    priority    INTEGER NOT NULL DEFAULT 0,
    is_active   INTEGER NOT NULL DEFAULT 1,
    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at  TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE TABLE kind_assignments (
    id                   INTEGER PRIMARY KEY AUTOINCREMENT,
    activity_id          INTEGER NOT NULL REFERENCES activities(id) ON DELETE CASCADE,
    workout_kind_id       INTEGER REFERENCES workout_kinds(id),
    assignment_source    TEXT NOT NULL CHECK(assignment_source IN ('rule_engine','manual')),
    status               TEXT NOT NULL CHECK(status IN ('assigned','needs_review')),
    confidence           REAL,
    candidate_kinds_json TEXT NOT NULL DEFAULT '[]',
    created_at           TEXT NOT NULL DEFAULT (datetime('now'))
);
CREATE INDEX idx_kind_assignments_activity ON kind_assignments(activity_id);
CREATE INDEX idx_kind_assignments_status ON kind_assignments(status);

CREATE VIEW current_kind_assignment AS
SELECT a.* FROM kind_assignments a
JOIN (
    SELECT activity_id, MAX(id) AS max_id
    FROM kind_assignments GROUP BY activity_id
) latest ON a.activity_id = latest.activity_id AND a.id = latest.max_id;

CREATE TABLE sync_runs (
    id                  INTEGER PRIMARY KEY AUTOINCREMENT,
    kind                TEXT NOT NULL CHECK(kind IN ('backfill','incremental')),
    started_at          TEXT NOT NULL,
    finished_at         TEXT,
    activities_fetched  INTEGER NOT NULL DEFAULT 0,
    status              TEXT NOT NULL CHECK(status IN ('running','success','error')),
    error_message       TEXT
);